SE444149B - CONTROL SYSTEM FOR REGULATING EXCHANGE DELAY CHANGES IN A MULTI-EXCHANGE AUTOMATIC TRANSMISSION - Google Patents

Description

l0 l5 20 25 30 35 7907597-4 entitled "Method and Apparatus for a Transmission Control System"., ¿ Later, this basic control system for achieving regulation of a friction-to-friction downshift in addition to it in the above-mentioned patent the upshift control. This improved arrangements are described and defined in the US Patent No. 4 l02 222 entitled 'Transmission Control System'.

Further work has been done on gear change in an automatic transmission based on the systems shown in the above two patents. Of course, that would be easiest to summarize the systems described in the patents with an indi- visual control arrangement for each upshift and downshift.

However, this leads to the utilization of a large number circuits, which are in fact identical but only can be used in a special upshift or downshift operation tion. Thus, considerable work has been done to achieve ma an optimal exchange between the number of wide circuits and the increase of logical complexity sequence when reducing the number »_-; .._. .l¿ ,,, _, "i 'fi ??. 1 .'-» Ãf-. ~.-.- a-.A> ~ .l. _ ams .. circuits, A main object of the invention is thus to provide come an efficient and inexpensive control system for regulating changes in gear ratio in an automatic transmission, in many conditions must be achieved and both the upshift and the downshift must be regulated.

Another important object of the invention is to provide a new and not at all obvious working procedure comparing the existing gear ratio with the desired gear ratio and wherein, in case of difference between the real and the desired relationship, the comparison interrupted while a change of relationship is effected. where- after the comparison resumes.

A consequent object of the invention is to provide one such a system with the greatest possible simplicity and for the longest possible cost by indicating circuits. which were then used to regulate a change of gear ratio. after which the specified circuits are disconnected and the comparison function established.

A gear control system. designed in accordance with principles of the invention, is useful for regulating the 10 l5 20 25 30 35 7907597-4 gears in an automatic transmission with multiple gear ratios, the gearbox being engaged between lan engine and a mechanical output drive connection. The system includes an exchange point computer, which is connected to receive input information, which contains torque requirements and at least an indication of an output parameter of the automatic transmission. for example PTO shaft torque, and to provide an output signal. which indicates the desired gear ratio of the gearbox. A monitoring control arrangement is connected to receive the output signal from the switching point computer and comparing this output signal with a state signal, which indicates the actual gear ratio.

When the state signal differs from the signal indicating desired gear ratio and which is provided by the computer, interrupts the monitoring control arrangement in the signal comparison and assigns or specifies certain components, intended for use in this change of gear ratio, wherein control signals are provided to the automatic transmission to provide the desired change of gear ratio. An alternating quality control circuit is connected to the monitoring control circuit. Growing quality control circuitry sends signals to the monitoring control the circuit for providing precise control of the change of the gear ratio and said circuit also transmit signals. terminating the change of the gear ratio. These signals enables the monitoring control circuit to resume the comparison between the desired gear ratio signal and the actual gear ratio signal. A converter is located next to the output shaft of the automatic transmission to give the indication of the torque or any other output parameter of the gearbox to the gearbox quality control circuit and to the the point computer.

The invention will now be described in more detail below in one form of a single the accompanying drawings.

Fig. 1 shows in simplified form a multi-speed gearbox. which can be used in conjunction with the invention.

Fig. 2 shows in simplified form the control inputs AND at @ f * 0DD ° the signaling arrangements for regulating the gear ratio it in accordance with the invention. 10 15 20 25 30 35 40 7907597-4 4 Fig. 3 shows a block diagram. iom indicates significant sub-.Å systems according to the invention.

Fig. 4 shows a block diagram. partly with the Boolean declaration S8. WHICH indicates components of a sub-section illustrated in FIG system.

Fig. 5 shows a diagram. which is useful for understanding the operation of the systems illustrated in Figures 3 and 4.

Figs. 6 and 7 show block diagrams, partly with Boolean angi- which indicate certain components of others shown in Fig. 3. lying subsystems.

Fig. 8 shows a diagram and Figs. 9A-9L show the timing diagrams, related to Fig. 8 and useful for facilitate the understanding of the invention.

Fig. 10 shows a block diagram. which further illustrates the components, which were used to complete an upshift with closed loop.

Figs. 11 and 12 show block diagrams. wherein Fig. 12 is provided with Boolean indication. further, more generic The subsystem illustrated in Fig. 3 is indicated.

Fig. 13 shows a program diagram which is intended to be lie the generation of logical signals. intended for use vidf control of a gearbox according to the invention. ' Fig. 14 shows a table illustrating the generation of the required control signals from the logistics indicated in Fig. ka signals.

Fig. 15 shows a diagram. which illustrates an arrangement to complete the program shown in l3.

To assist those skilled in the art in practicing the invention first, a gear mechanism will be described generally in order to indicate the gear elements, which are regulated by the control system according to the finding. For this purpose, Fig. 1 shows in simplified form that more detailed arrangement of a gearbox according to the perhaps Patent No. 3,744,348 Figure 1. In Figure 1 of this application the gearbox generally comprises an input shaft 50, which is connected to the drive unit of a hydraulic torque converter S1, which in turn via planetary gear units 52. S3 drives an output shaft 54. The gearbox is provided with a number of friction interventions devices for establishing the various gear ratios fig. in the gearbox. The friction devices comprise a first or front coupling 55. a second or rear coupling 56. a first brake S7 and a second brake 58. 10 15 20 25 30 35 7907597-4 The coupling 55 is connected whenever the system according to Fig. 1i driver. To establish the first arivförnaiianaet, an aš was sent electrical signal via line ll3 to actuate the valve Vl kx which engages the brake 58 to provide via the gear unit 52 a reaction of the gear unit 53 and to provide output drive via axein sa. To establish the second arivförnaiianéf the brake 57 is engaged by a signal via the electric shaft: line 114 is sent to actuate valve V2 and is disconnected brake 58. This causes a reaction against the crown gear in the gear unit 53 and thus gives the second ratio. In order to establishing the third drive condition, the brake S7 is disengaged and an electrical signal was transmitted via line 115 to act valve V3 and to engage the coupling 56. This establishes direct drive via the gear units and provides the third holding. Thus, the effective changes in the relationship is achieved by utilizing electrical signals. for controlling the three valves Vl. V2 and V3, which are shown in Fig. 1 in simplified form, to regulate the action of the brake 58, brake 97 and clutch 56 respectively. Steering system according to the invention, which provides the electrical signals for control of the valves V1, V2 and V3, will now be described in connection with Fig. 2. _ Figure 2 shows in block diagram form the use of a such closed loop control system designed to provide electrical signals via lines ll3, ll4 and ll5 for control of corresponding electrohydraulic valves (not shown) in a automatic transmission lDl to effect changes in the gearbox dance gear ratio. The automatic transmission receives input drive via a shaft l02 from an engine (not shown). Gearbox output mechanical drive connection is shown as a drive shaft or axis of rotation 103, on which a torque converter 104 is mounted. This converter works to provide a torque related signal ("PTO shaft torque") on line 105 and a nastignetsreiateraa signal pa ieaningen ine. na en signaiiea- shown in the drawing, the person skilled in the art should, of course, Council understand that often two electrical wires are used for producing a voltage difference, denoting a particular parameter. A suitable converter. which is useful in this arrangements, are described and defined in U.S. Pat. 10 15 20 25 30 35 j, _ 7907597-4 No. 4 100 794 entitled 'System for Measuring Torque and Speed of Rotating Shaft ”. The control system receives other signals including area selector information, via line 107 from a gear range selector switch 108. Such a switch1 or arm is generally mounted on or adjacent to the steering column in a vehicle. which is equipped with an automatic transmission. and if- connectable between the displayed positions az parking, reverse, neutral, dflv fl l fl q. 2 and 1. The control system 100 also receives torque requirements. information via line 110, and this is displayed as one from a potentiometer 111 obtained damper position signal. As shown is the potentiometer's movable coupling arm mechanically linked with a movable damper plate of a carburetor 112 but of course the arm of the potentiometer can be brought into position by the action of the accelerator pedal or by any other suitable arrangement for providing the torque requirement signal in line 110. Alternative! the torque requirement signal could be obtained through changes in ingast pressure. The control system 100 also receives additional information via line 116 from the engine control information 117. This additional long-range information can be made of stored information, e.g. such as a "map" or a information, which is for given operating conditions information matrix, which contains reversible to obtain maximum economy attitudes. Other types of engine control information may be race, e.g. a signal, which captures the percentage of the different the components of the engine exhaust or a desired fuel ratio of the mixture delivered to the engine or any another desirable parameter. The control system works with these input signals for in the output lines 113, 114 and 115 provide selective output signals for regulating selected means (eg individual valves, not shown) in the automatic the gearbox 101 for effecting the desired change of gear ratio. The operation of such valves to incoming and outgoing friction elements in such an exchange box are now well known and well understood. Consequently comes it is only necessary to provide an explanation regarding operation of the control system for transmitting the required the signals in lines 113-115 to it must be possible to understand the sequence. 10 15 20 25 30 35 7907597-4 7 As shown in Fig. 2, the control system 100 includes three. essential subsystems; namely the monitoring control circuit 118. the switching quality control circuit 119 and the switching point computer circuit 121, The switching point computer receives input information, which is contains information regarding torque requirements, motor control, the output shaft 103 and (via the monitoring control unit 118) area selector. In very simplified terms, the monitoring power sen 118 is considered as monitoring input information, which "tells" the same, in which the gear ratio the box should work. the monitoring control circuit 118 "senses" from previously to the current condition of the gearbox. When monitoring The control circuit 118 determines that the current condition differs from the desired gear ratio interrupts the function of the circuit to monitor input information and tier operation of the shift quality control circuit 119. the shift is then completed during the regulation of exchange quality and the wake control circuits, which gives the correct influencing sig- 2 at the appropriate times via the selected leaders of conductors 113-115 for effecting the change of the gear relationship. When the change has been completed, this is indicated with a signal from the shift quality control circuit 119 back to the monitoring control circuit, which then returns to its operating mode, the signal relating to the desired condition monitored to ensure that the same corresponds to the dance current gear ratio. With this perspective, more now a further account of it with closed loop work 'the control system 100 to be specified.

Fig. 3 shows essential subsystems of the control system, which is illustrated in Fig. 2 as a single block. Further Fig. 3 includes a selector switch output circuit 120, which does not constitutes a substantial subsystem without a conventional, tronic buffer circuit. used to prevent malpractice gave output signals or output multiple control signals as a response on a single. generally mechanical, input signal. For example, can a driver inadvertently wiggles the joystick when moving change range selector from neutral to drive mode. which could generate multiple trigger control pulses. However the circuit 120 ensures that only a single logic order signal was sent to indicate the mechanical impact of the selection 10 15 20 25 30 35 7907597-4 8 ken. The exclusion circle is represented together with the the logic logic circuit 1Z3 and the direction logic circuit I24 thereof separate route. which in Fig. 2 has the designation "monitoring steering".

A switching point computer l11 is shown, which receives several of the logic signals from the bounce circuit 120 in Fig. 3.

Those skilled in the art will appreciate that the switching point computer l2l constitutes a special accessory of an ordering body for relationship, which body works to provide a growth change order signal or a signal for the desired exchange condition, when the body receives appropriate input information signals. In this embodiment, the switching point computer receives area selector information, which is represented by the four the conductors for supplying the logic signals L1, L2, LD and LR. torque requirement information, which is represented by it via the line ll0 received damper position signal, as well as speed information tion, which is indicated by it to the switching point computer l2l via lines 106 and 222 transmit the signal. Switching point computer l2l represented by output signal consists of a ratio change order signal, the two logic signals LA and LB. The for transmitting the logic signals is 3 because this would make signs individual leaders not identified in the statement is too compact without adding additional The logic signals LA and LB denote the information fig. formation. g regarding the desired relationship and together consider the two logical signals are taken as an order signal gear change. Q Another important subsystem is the monitoring logic circuit. then l23, which is connected, as shown, to receive different input signals, including the relationship change command signal (LA and LB), and area selector information (ÉÛ). The dash (__) over one signal indication, as in ÉÜ, indicates the logical sentence ("not LD"). The Ntsignal of the monitoring logic circuit includes take gear initiation signals and current gear ratios country signals (or state signals). Shift Initiation the signals are represented by the two logic signals LUS-R and LDS-R. The designation "R" generally denotes a "reset" "initiation" or "initiation" action to start a cycle »,. ., ..., ... ._ »~., _____ A _... 10 20 25 30 35 7907597-4 9 of gear ratio change, including other subsystems tem. for example direction logic circuit 124 and either the upshift circuit control circuit 125 or downshift control circuit 126. the initialization signal LUS-R was sent to both upshift controllers circuit 125 and directional logic circuit 124 and downshift initiator the LDS-R signal is sent high to the downshift control circuit 126 and to the directional logic circuit 124. Status or supply the standby signals LC and LD, which indicate the current iixel positions. both are sent to the directional logic circuit 124, the state the signal LC was also sent to the upshift control circuit 125 and whereby the state signal LD is also sent to the downshift control circuit 126.

The upshift control circuit 125 receives the state signal LC, the PTO shaft torque signal via line 105 and transmits at receiving the upshift initiation signal LUS-R two control signals to the directional logic circuit 124. These control signals is LUS-N for controlling the incoming friction element and LUS-F for controlling the outgoing friction element tet. These two signals will be routed through the directional logic circuit 124 for transmitting the appropriate signals via two of the three conductors 113. 114 and 115 for regulating lingen. The directional logic circuit 124 also nuts the two accessories. the position signals LC and LD and that of the shift initiation signal (LUS-R or LDS-R) transmitted by the monitoring logic circuit sen 123. In a similar manner, the downshift control circuit receives 126 the state signals and the torque signals and works for to send the two signals LDS-F and LDS-N to the directional the circuit for providing signals via two of the three leaders 113-115 for regulating the outgoing and incoming element during a downshift.

At the end of a gear change sequence, a "Shift-Complete" signal from upshift or downshift control circuit to the monitoring logic circuit 123. the circuit thus emits a final signal LUS-0 to the monitoring layer. circuit 123 at the end of an upshift sequence and downshift The control circuit 126 outputs a shift-completed signal LDS-0 to the monitoring logic circuit 123 at the end of a sequence for gear change. 10 15 20 25 30 35 7907597-4 10 The foregoing brief description of Fig. 3 includes takes many simplifications with regard to the complete operation the system. For example, each of the upshift and the downshift control circuits are both a calculation circuit with closed loop and a reaction torque calculation circuit in analogy to it closed loop control device 47 and reaction the torque calculation circuit 60 of Fig. 5 of the U.S. patent No. 4,031,782. However, these simplifications increase understanding of the entire system operation and will be helpful when they individual subsystems are described one after the other.

Main components of the switching point computer subsystem l2l indicated in Fig. 4. the input conductor 110 and the speed indication signal are transmitted via the input conductor l22. A first logic signal Llst was sent via the conductor l3l, when the gearbox has the first gear position. and one second logic signal L2nd was sent via conductor l32. when gear As can be seen, the torque order signal was transmitted on dan has the second driving relationship. The other inputs output is made of reference voltage level signals. each indication a special torque requirement or a special speed value.

On line 133, for example, there is a voltage level signal. which indicates 85 1 of the maximum torque requirement. which can be indicated of the damper position signal on line ll0. This order signal conditioned (filtered) in step l34 to on the line _l35 give a conditioned torque requirement signal. Thus, comparisons the output signal of the sensor device 136 on line 137 is a logic signal, which indicates whether the torque requirement exceeds 85% of it maximum available torque. This signal is often said to be one "Lock" or "kickdown" signal, which is obtained when the accelerator pedal is pushed to the bottom by the driver to provide a speed acceleration. ' Each of the three function generators l40, l4l and l42 also receives the torque requirement signal on line 135 and leaves when an analog output signal on lines l43, 144 and l45, respectively.

The signals on lines 143-145 are all analog signals. naler. These functional signals are compared in comparison devices. ningarna l46. 147 and 148 with the speed indicating signal, received via lines l22. l5C. The digital outputs from the comparison devices 146-148 are shown in Fig. 5.

Atv-v V3: š, -ILLywX ~ .a -..-.> ...- «- L.c .... ~ ..._..._.'._ *, __- * L.“ .... x .F É 7901591-4 11 Fig. 5 shows that the comparison device 146 on the line 151 provides a functional output signal, as indicated by curve 152 in Fig. S. Output signal of the comparator 147. which was sent via line 153. is represented by the dashed line curve 154 S in Fig. 5. The functional output signal from the comparator 148, which signal is transmitted via line 155. is indicated by means of the curve 156 in Fig. 5. The text in Fig. 5 indicates in general the shaft speed in revolutions per minute along the ordinate and the damper the position along the abscissa. Those skilled in the art will recognize that Any other indication of torque requirements, e.g. ingastryck. would can be selected and reproduced along the abscissa without those in Fig. 5 specified function curves change. 1 Three additional comparators 157, 158 and 159 shown in Fig. 4 and each such device receives as an input 15 signal the speed indication signal on line 150. In addition the comparator 157 receives via the line 160 a voltage level signal, which indicates a speed of 350 rpm.

The comparison device 158 receives via the line 161 a voltage level signal, which indicates 1800 rpm. Comparison device The line 159 finally receives at the input line 162 a voltage level signal, which indicates an axis speed of 3450 rpm per minute. The output of the comparison device 157 is transmitted via l63 to one input terminal of the treatment center 164 and the output of the comparator 158 were transmitted via 165 to the same treatment step. Comparison device 159 output signal is transmitted via line 166 to one input terminal the conclusion of the treatment step 167. which step also receives the first and second gear signals via lines 131 and 132, the output of the kickdown comparator 136 and output The signal from the comparator 147, the processing step 168 receives the logic signals Llst and L2nd and In addition the signal from the comparator 146. The processing step l? 0 receives on line 131 the logic signal. as here sam- man with the first gear, and also receives the output signal from The comparator 148. The respective outputs of the treatment steps 164 and 170 are connected to the É and S connections at a flip-flop 171. which at its output conductor 172 leaves the digital speak the Lñ signal, which in Fig. 3 is shown as an output signal from 10 15 20 25 30 35 7907597-4 ' 12 the switching point computer 121. The other two processing steps 167. 168 outputs are connected to the respective input connections E and É in the second vipoan 173. which at the output conductor 176 leaves when the LB signal from the switching point computer. operations are indicated 164, 167, 168 and 170, the person skilled in the art should different circuit designs can be used to achieve the math-V processes, which are symbolized by the indications within these steps.

The term "processing step" refers to a logic circuit for performing the mathematical operation or operations. as what idea indicated by the Boolean designation within the rectangle identified as a special step.

Fig. 6 shows the monitoring logic subsystem 123 which more generally illustrated in Fig. 3. As shown in Fig. 6, the the LA and LB signals are given via conductors 172. 174 'is that the desired gear ratio. The output signals LC and LD lol and these signals indicate Furthermore, the system leaves indicate provided on lines 180, the actual gear ratio of the system. according to Fig. 6, the shift initiation signals via either of the conductor 182 or 183 for starting an upshift or a downshift operation and receives a signal LUS-0 or LDS-0 in return via conductor 184 or 185, when the special switching the operation is completed.

More specifically, the shift change order signal is transmitted the signal for the desired gear such as the two digital signals LA and LB via conductors 172 and 174 at the input side of the monitor the logic control arrangement, as shown in Fig. 6. The signal LA on conductor 175 was transmitted directly via conductor 186 to one input the aisle section of a NONE AND gate 187 and the same signal is transmitted via an inverting step 188 to one input terminal of another NON-AND-STEP 190. This NON-AND gate 190 also receives a rewinding signal via line 191. which signal was also transmitted via line 19? to another NON- AND gate 193. and NOT AND gate 190 receives another return. connection signal via the wires 194. 195. Yet another feedback signal is sent via line 196 to the last one the input terminal of the NOT AND gate 190. This 1CK [-0fH- gate output was transmitted via a delay site 197. which is Although certain matematis- f in each of the treatment stepsï realize that J 10 15 20 25 30 35 7907597-4 13 of the thief. which only delays the transmission of a pulse in the negative direction and transmits the leading edge of a pulse or laughs a pulse that goes in a positive direction with virtually none; § delay at all. This delay signal was sent in turn from step l97 to the É input of flip-flop l98. as indicated.

The NAND gate l87 receives a feedback signal via 200 and sends its output signal via another delay step 201, which similarly provides a delay only with respect to the transmission in the negative direction of a pulse signal nal to the É input of flip-flop l98. The output signals at Q and Ö of rocker l98 are denoted A and Ä respectively to better describe the treatment operations in the subsequent steps in the monitoring logic control subsystems.

The logic A signal is transmitted from the Q output of the flip-flop 198 via conductor 202 to one input of the NONE gate 203 and the logic A signal is also transmitted via conductor 204 to the one input connection of the treatment stage 205 and via the conductor 206 to one input terminal of the other action step 207. These treatment steps are those. as so small- the respective shift initiation signals LUS-R via conductor l82 or LDS-R via conductor l83. the signal from flip-flop 198 is transmitted via conductor 208 to one the input terminal of the NONE AND gate 210 and the Ä signal the input connection The logical Ã-ut- was also sent via the conductor 211 to one at the NOT AND step 193. The LC AND gate 203 receives. for- in addition to the logic A signal on line 202, also downshift the over- or LDS-0 signal via line l85. NON-DCH-grin- its 203 output is connected to the É input of the flip-flop 212. whose Q-output is connected to the output conductor 180 for of the LC signal (already described in connection with Fig. 3).

The Q output signal also provides a feedback signal via line 191 to NOT AND gate l90 and to NOT AND gate l93 and this feedback signal was also sent to the two processing steps 205 and 207. The non-DCH gate 210 also receives, in addition to the logic à signal via line 208. the upshift-over- the signal via the input conductor 184 and the output signal from the ICCE-0CH- gate 210 was sent to the flip-flop 212 E input. Vippans 2l2 0- output is connected via conductor 200 to one input terminal. 10 15 20 25 30 35 7907591-4 14 the end of the NOT AND gate l87. Thus, they are off the rocker 2l2 produced the output signals LG and the ff signals. such as given.

At the lower part of Fig. 6, the LB signal is transmitted on AND gate 193 and said signal are also transmitted via an inverter f step 215 to one input terminal of another NONE AND STEPS 216, the second input terminal of which receives the LD output the signal on line l1l as a feedback signal via line f 217. The other inputs to the NOT AND gate l93 consists of the ÉÛ signal via the line l94, the one via the lines ll1 and l92 return the LC signal and the Ä signal on the line 2ll. The output signal from the NOT AND gate 193 was transmitted via a preamble delay step 217. which only delays the part of the pulse which ken goes in the negative direction, and this signal was sent to one tilted 218 R input. The output signal from the NOT AND gate 216 transmits is carried out in the same way via another delay step 220, which is also ï so only works when transmitting the pulse in the negative direction> and gives this delayed signal to the flip-flop § 188 input. V.I.P- pan 2l8 leaves at its 0-output a logical B-Signal, as via the line 221 is transmitted to the NONE AND gate 222 and also via line 223 to one of the longitudinal terminals of the treatment step 205 and in the same way to an input terminal of the action step 207. The same logic signal on line 223 is transmitted is also routed via line 196 to one input terminal at the NOT-AND gate l90. The Ü signal from the flip-flop 2l8, which signal occurs at the flip-flop Ö output connection, transmitted via line 224 to one input terminal of the ICE-OCH gate 225, which also receives an input signal from the line 184. Ucke-ocn-grindens 225 uisignai sändes: iii s-ingangsansiu: - of the flip-flop 226, which also receives the output signal from NOT AND gate 222 at its É input terminal. Vippans 226 Q output signal is used to provide the LD signal on the conductor l8l. which signal is also fed back via line 217 to a input connection at the NO-AND gate 216 and via the cable 227 to each of the treatment steps 205 and 207. Vip- pan 226 Ö output outputs an É0 signal. SOM SåS0N En åi6f ¥ 0PP ° signal is transmitted via line 194 to one input å; line 174 directly to one input terminal of NON-âï 10 15 20 25 30 35 7907597-4 3 'å f? of "than the connection of the NOT AND gate l93 and via the line l95 _d to one input terminal of the NOT AND gate l90. The Ä The circuit indicated in Fig. 6 thus receives the input signal LA. LB. I which refers to the desired relationship. on the input conductors l72 å and l74 and the signal (LUS-0 or LUS-0), regarding the changeover completed, via either conductor l84 or 185 and provides the signal LC. LD, regarding the actual gear ratio or the condition, on the output conductors l80. l8l and the signal LUS-R or LDS-R, for shift initiation, via conductor l82 or l83.

The tab in the upper left corner of the figure indicates the nals at Q and Ö for each of the flip-flops l98. 212, 218 and 226 for a given set of logic inputs at É- ooh The É inputs. 7 shows main components of the upshift control circuit this FIG. l25 and more particularly the reaction torque computer part in system. To better understand the interconnection and interaction of the components shown in Fig. 7 now come under the physical the description and then in the operating description reference to be made to Fig. 8, in which figure the curve 228 represents variations in torque signals on line 105 in Fig. 7 during a whole upshift sequence. In addition, they come under the torque curve 230 in Fig. 8, the timing diagrams 9A-9L to be used to assist those skilled in the art in understanding and ma control system according to the invention. The time management diagram generally refers to different times t0-t7, which are shown with the abscissa just below the torque curve 228 and in turn are these times related to the markings 230-237, which ka is shown at different points on the torque curve 228.

Fig. 7 shows four input signals, three of which already have described. The torque signal is thus provided on the input line. ningen l05. The LC signal (part of the state signal or the switching signal, which consists of both LC and LD) was transmitted via ningen l80. The upshift initiation signal LUS-R finally transmits des via the entrance leader l82. They showed the FHM signals. which transmitted via input line 250. will be described in connection with Fig. 10. At the moment, it is enough to observe that this pulse width modulation signal is a signal which changes with an F 1-ig relative pulse length, when the system remains in the same 10 15 20 25 30 35 “16 gear ratio, whereby the pulse length changes either below GH Uvßshift or a downshift. Fig. 7 also shows four output signals. A low torque is provided on the output line 251. signal for influencing an in the form of an open loop designed UPHEAD control circuit 252, whenever the shift cycle is initiated (indicated by a signal received via input line l82) at a time when the torque signal on line l05 has a level .. which indicates the torque value below a certain nominal level (example- I vis 25 foot-pounds). Unde 'äesza conditions initiate low- the torque signal on the line 25% the operation of the control etch 252 for performing switching sequences and time control in the same way as an uncontrolled growth is normally accomplished. Hereby and use of the control system designed as a closed loop met. when the torque level is too low for stable, efficient operation.

A There is another logic signal on the output line 252. which is called ÉTÉI. This is the ramp recovery control channel, which was transmitted at time t5, as shown in Fig. 8, for to reset the "ramp" or slope of that reference signal. which forms the basis of this part of the torque curve between times ~ t5 and t6 in Fig. 8. On lines 253 and 254 there are the outgoing and incoming elements of the the controlled gear unit. With this perspective now comes one more detailed description of the block arrangement in Fig. 7 to be left.

The torque signal. received via line 105. sent to a minimum torque memory circuit 255, to an integration circuit circuit 256 and to a timing circuit 257. Integration circuit 256 also receives the upshift initiation signal LUS-R and a timing signal from the timing circuit 257.

During a period of time, which corresponds to the interval between tD and Thus, in Fig. 8, the integration circuit operates to provide follow the averaging torque level signal on line 258 the time tl and thereafter throughout the shift sequence. circuit 255 is of the type which is continuously reset when the input signal level decreases and which stores (or "remembers") Memorial the minimum level of the input signal even after it starts to increase. This minimum torque level signal is presented on line 260. control circuit 257 is preset to provide a control signal. 10 15 20 25 30 35 7907597-4 17 channel for regulating the integration circuit 256 during time inter- É the choice between t0 and t1 in Fig. 8 and at the end of this time i intervals to achieve a delayed upshift initiation phase signal on the circuit output line 261. «å There are four comparison circuits 262-265. which are cup- laid in the manner shown to operate with those just described the signals and to provide a plurality of triggering and control signals. More specifically, the comparison circuit receives 262 the mean torque signal via line 258 and said circuit also receives a reference voltage signal on line 266, where at the reference voltage corresponds to a preset minimum level.

In a preferred embodiment, this level is set to answer 25 foot-pounds. Comparison circuit 262 thus takes to leave a logic on the output line 267 signal, which indicates whether there is an appropriate torque level on the PTO shaft to complete a controlled in a closed loop shift sequence. The low torque signal on line 25l is achieved at the end of the torque averaging interval between points t0 and t1, as shown in Fig. 8, whenever the average the torque value is not at or above the pre-set set the reference level, e.g. 25 cup pound feet.

In fact, the comparison circuit 265 was first used only during a 1-2 gear up. This circuit is arranged to "Tell" the supply circuit to prepare the control valve for the rapid reaction required during 1-2 growing up lingen. To this end, the first comparative circuit 265 a first trigger or trip signal, which shown as Cl, via line 270 to another treatment step 271 and the first trigger signal is also transmitted via line 272 to an S-input 273 S input. The whole system, working with closed loop, will be affected either by a second trigger signal from the second comparison circuit 264, which signal is read via the circuit output conductor 274, or off a rotary trigger signal provided by the comparison circuit 263 via its output conductor 275. Comparison circuit 265 leaves its first trigger signal on line 272 and on line 270 at the approximate time when the value of the torque signal decreases to 0.8 times the mean torque level. wherein said 10 15 20 25 30 35 7907597-4 18 time is denoted by the time t2 in Fig. 8. The second the control circuit 264 is set to leave the second trigger the signal via line 274, when the mean torque level drops further to 0.6 times the mean torque level, with time the point is indicated at time t3 in Fig. 8. VPídjämfÖf21S fl ' circuit 264 leaves a signal on line 275 after the mean torque level signal has reached its minimum level and increased to a point (designated 234 in Fig. 8) at which the average the torque signal is 20 cup feet larger than the minimum value signal._ occurs at time t4 in Fig. 8.

The adaptive increase / ramp program step 276 receives gives both the mean torque signal on line 258 (see Fig. 9C) and the LC state signal via line 180. This program step 276 works to provide a first analog voltage on line 277 to regulate the ramp voltage in it with closed l0 during the controlled growth This looped control unit in FIG. and a second analog voltage via line 278 to correspondingly regulate the gain in the closed loop.

These connections will be described later but their basic function should be seen with reference to Fig. 6 of the U.S. Pat. U.S. Patent No. 4 D3l 782. In said figure it leaves adjustable calculation circuit 93 an analog ramp control voltage via conductor 92 and an analog gain control voltage via conductor 94. 93 also leaves a feed signal and this should also It should be noted that the adaptive computing circuit appear in the present application. Again, the one indicated in Fig. 7 of this application is considered the upshift control circuit 125, the low torque signal on the 267 was sent to one input terminal of a NONE OR gate 280, which also receives the delayed shift initiator signaling line 26l and the common line ningen 28l. The output of the NOT-OR gate 280 is sent to the S-input at a flip-flop 282. which at its R-input receives the delayed shift initiation signal on the common line 28l. The output signal from the Q output of flip-flop 282 consists of the low-torque the signal on line 251 and this signal is also transmitted via line 283 to treatment steps 284, 285 and 286. 10 15 20 25 30 35 7907597-4 19 The processing step 287 receives the delayed switching the initialization signal (Fig. 98), the rotary signal (Fig. 91) via the 275 and the second trigger signal (Fig. 9H) via line 275. The output of treatment step 287 is sent to the S input the thread of a flip-flop 288, which at its R-input receives it delayed upshift signal on line 281. Rocker 280 left at its Q output the logical LCL signal to the processing step 284 and at its Ü output an fff output signal on the line 290 for use in the closed loop control unit the part shown in Fig. 10. The LCL signal from the flip-flop 288 is sent as an input to the processing step 284, which also receives the low torque signal via line 283 and a feedback signal from the differentiating circuit 291 via lead step 292. The processing step 284 leaves the ÉTÉÉ signal on the output conductor 252 and this signal is represented in Fig. 9L.

As previously stated, the first trigger signal was sent on the line 272, which signal is also indicated in FIG. 9G. to the rocker's 273 S input. This rocker receives at its R-input a delayed signal from the delay stage 293 and at its Q output, flip-flop 273 outputs an LRR signal (i.e., a local signal for controlling the ramp recovery at the time t5) to the differentiation step 291. This input signal is the one which generally shown by the step function signal 294 during the differential the effect of the differentiating circuit and the differentiation stage 291 is that produce a sharp pulse, as illustrated at 295 and is shown in Fig. 9K, to control the reset of the ramp.

The treatment step 285 also receives, in addition to the delayed upshift initiation signal on line 281 low the torque signal via line 283 from flip-flop 282 and a return switching signal via line 296 from processing step 268.

At its starting point, the treatment step 285 leaves the regulatory the signal for the output friction element, the signal designated LUS-F. on line 253.

The processing step 271 receives a feedback signal from step 268 via line 296. the trigger signal, which developed by the first comparator circuit 265 via the line 270. the trigger signal of the closed loop (Fig. 9L) via 297 from the treatment step 284 and the delayed growth 10 15 20 25 30 35 7907597-4 the initialization signal (Fig. 98) on line 298. This delayed signal was also sent directly to processing step 298. as indicated. The output of the treatment step 271 was transmitted both to the next treatment step 268 and to the delay stage 293. In addition to the input signals just described for step 268, the LC state signal is also transmitted via the line 300 to this step and the PHM signal is transmitted via 250 to step 268 and to the last treatment step. 286. The PUM signal is obtained, as will be described, from the guide arrangement designed as a closed loop according to Fig. 10. In Fig. 7, the two output signals from the processing step 268 directly to the last treatment step 286, such as is displayed, and in addition, the OT signal is transmitted as a feedback signal via line 296 to one input terminal of rose 27l. The low torque signal produced by the flip-flop 282 is transmitted via line 283 as one input to the processing step 286 and the other inputs to this step already have described. As a result of the the Boolean operations described in gel 286, the output signal is obtained LUS-N to regulate the incoming connection. wherein said signal is transmitted via line 254, as indicated.

Fig. 10 shows the guide loop designed as a closed loop. of the upshift control circuit l25. This circuit leaves the growing end signal LUS-0 on line 184 at the end of and it also leaves the PWM signal on line 250 for application, via the conductor, to those illustrated in Fig. 7 the circuits. In Fig. 10, the torque signal is transmitted on line 105, 'as shown, and both the analog voltages for ramp and the reinforcement control components, which voltages have been developed by the gram step 276 in Fig. 7, is also used on lines 277 and 278. The fff signal developed at the flip-flop 288 Ö output was transmitted via line 290. The upshift signal LUS-R (delayed) was transmitted via line 281. The LC state signal on line 180 are also used. _ The torque signal transmitted via line 105 is transmitted both those to a track and hold circuit 303 and to a summing step 304. is related to the moment of moment at the PTO shaft.

The circuit 303 continuously follows the torque level signal, which At it 10 15 20 25 30 35 7907597-4 21 time when the ÉTÉ signal is transmitted via line 298 is activated the memory portion of the circuit 303 to store the then-existing that of the torque on the input connection, After receiving the logic signal on line 290 is "held" and presented thus this stored value via line 305 on one input time of the summation step 304. The same logic signal on the 290 was also sent to a ramp generating circuit 306. which upon receipt of the analog voltage on line 277 to initiate the generation of a sloping voltage waveform (or "ramp") on line 307. This upwardly sloping waveform is used to regulate the increasing torque during the controlled upshift time between the times t5 and t6, such as is shown in Fig. 8. This ramp signal is sent to an input terminal of the comparison part 304 and to one input of a timing circuit 308, which also receives the analog ramp the control voltage on the input line 277. Since the slope is turn and order is set by is matched by the charging time and i the components of the ramp generator 306 at the time of the ramp level exceeds the voltage level of the other analog control voltage the timing controller 308 transmits the upshift signal LUS-0 on line 184. This occurs at time t7 in Fig. 8.

The analog-to-digital converter circuit 310 is constituted by one conventional circuit, which receives the analog gain control the voltage via line 278 and the delayed upshift initiation signal via the line 281. This converter circuit operates takes the received analog voltage and leaves a digital one combination of output signals on lines 311-314, so that this combination of four digital signals may indicate sixteen different levels of the amplification voltage. These digital signals presented when the delayed upshift shown in Figure 9B the signal goes from 1: iii logically 0 at the time t sequence. The signals were sent in turn to one adaptive gain control circuit 315, which also takes a summed or algebraically combined signal via conduction 316 from the summing circuit 304. It is thus obvious that the analog gain control signal on line 317 at the output side of the adjustable gain circuit 315 is a function of both the gain control voltage and the ramp 10 15 20 25 30 35 7907597-4 22 the adjustment voltage. Those skilled in the art regarding control with closed loop should realize that the analog gain voltage the conduction on line 278 is reduced in the event of higher torque level signals on line 105 to ensure stability in the control system designed as a closed loop. At lower torque levels, however, the gain is increased to reduce trace errors in the system. The output signal from the adaptable the amplification circuit 315 is always presented via line 317 for the frequency compensation network 318, which is affected upon receipt of The LC state signal via line 180. This network can be brought to work differently during the 1-2 up shift, because it the logic signal, as shown on line I80, is constituted only of logic 0 during the 1-2 upshift and at all other times of the logic l. The output signal from the frequency compensation network 318 was sent to one input terminal of another sum step 320, which also receives a correction signal via line 321 from a zero adjustment unit 322. The logic LC the signal on line 180 is also sent to neutral circuit 322 and a part of this signal, which is determined by the setting of an adjustable component in the zero circuit, is transmitted via line 321 to the summing step 320. The output signal from the summing step 320 consists of an analog signal on line 323, which signal is was used to control the pulse length of the alternating on the line 250, which signal is produced by the pulse width modulation circuit 324. _ Fig. 11 shows circuit details regarding the logic blocks 271. 268 and 286, which in Fig. 7 are illustrated in simplified form form The Boolean expressions for the logical steps 271 and 286 are also specified. Because the term is more complicated for gen 268 shows the circuit details of the two interconnected flip-flops.

Consequently, the person skilled in the art should easily understand both the electrical ones the connections and signal processing operations of the i Fig. 11 shows the arrangement for producing the signal LUS-N for regulating the incoming friction element.

In Fig. 12, in Boolean form, the details of the logistic the direction circuit I24, which is shown more generally in Fig. 3.

The same designation is used in Fig. 12, which thus identifies all the logical signals with the same character used in .S2 'i' ß 'i 10 15 20 25 30 35 7907597-4 23 Fig. 3 and in the other drawing figures. In Fig. 12 receiver the processing steps 330, 331 and 332 the state signals LC and LD. the shift initiation signal (LUS-R or LUS-R) to start the circuit operation for either an upshift or a downshift as well as the appropriate pair of signals to regulate them incoming and outgoing elements, depending on whether the system the program controls an upshift or a downshift. After treatment in steps 330, 331 and 332, the signals from these steps were transmitted to the additional == ø steps 333, 334 and 335, which also receive the logical inverted insignia R and the logical neutral the signal N from the shift range selector. The output signals from genes 333-335 give signals on two of the three conductors ll3, ll4 and 115 for controlling the incoming and outgoing friction . nfe .. 3 Oh the elements.

There is a third signal input to each of steps 333-335 from delay step 336. This step provides a a time delay in the signal from the processing step 337, which in turn receives signals from each of the steps 330-332. By processing the signals in the way shown in step 337 and by the following delay of the output of * this step in the delay step 336 before the signal is sent to steps 333-335, the control system is protected against locking of the gearbox by a premature connection of a friction element before another element has been disconnected.

When considering the upshift sequence during operation of the system according to the invention it is assumed that the vehicle in which automatic gearbox l0] is installed, has been started, that the the box has the first gear position and that the area selector switch pure is in D (drive). Furthermore, it is assumed that the torque know, as indicated by the position of the contact arm of the potentiome tern lll in Fig. 2, means that more torque is required than that produced and left via the PTO shaft 103 at the walking side. The switching point computer l1l (Fig. 3) leaves a digital one or logic 0 as each of the outputs LA and LB, which ket indicates that the gearbox assumes the first gear position. Before the switch is requested leaves the logic monitor circuit 123 also logic 0 or low level signals, such as state signals LC and LD, as well as logic l or high level signals. as 10 15 20 25 30 35 7907597-4 24 the initialization signals LUS-R and LDS-R. The signal on the wire ll3 is a logic l- or high signal to the valve Vl, below detj that the signals on the lines llß and_llS are low at this Å time. This is the state of the system just before the damper position q signal (or torque requirement signal) on line 11D input indicates that, compared to the actual moment. which is signaled via line l05, an upshift is requested.

When the shift point computer determines that the shift should be desired-gear signal LA, LB. so that the signal LA l signal, while the LB signal remains low. received by the logic monitoring circuit l23. which in effect compares the desired relationship with it current signal ratio. indicated by LC and LD. and determines that the 1-2 switch should be initiated. This achieved through the signal LUS-R, which is shown in Fig. 9A and appears at time t0 in Fig. 8. The signal LUS-R thus becomes low starting from the normally high position of the signal or its logic 1 position at time t0 in Fig. 8. As shown in Fig. 7 the upshift initiation signal was transmitted via line l82 for to start the operation of both the integration circuit 256. which be changed gets high, a This signal themselves more to give the mean torque signal at the end of the period between tD and tl, and by the timing circuit 257. used to determine the length of the period. Furthermore, LC sig- nificance remains nafen on line 18D in Fig. 7 a logic 0 signal, which "tells" the system that an 1-2 transmission is requested and not a 2-3 upshift, which would have been signaled by a logic 1 signal on line 180. Thus, the combination upshift initiation signals on line 182 and the condition signal on line 18D not only indicates that a ling will be initiated without also what gearing sequence to be followed.

At the time t1, which constitutes the end of that in Fig. 8 illustrated torque averaging time. will it be the output signal of the torque averaging timing stage 257 low, as shown in Fig. 98. At this time, the average the torque signal on line 258 a constant, which the averaging moment of the PTO shaft of the vehicle just before the shift operation begins. Note that this delay 10 15 20 25 30 35 al: i 7907597-4 25 when signal at time t1 is transmitted from the timing circuit 257 output as one of the inputs to the processing step 285, so that there is immediately a certain signal level on the 253 to regulate the output friction element. whereby the PTO shaft torque thus begins to decrease. such as as in Fig. 8, ' At time t2, the PTO shaft torque has decreased to approximately 0.8 times the mean value level just before the the sequence started and at this point the output signal is off the first comparator circuit 265 was to provide it first, the trigger signal shown in Fig. 9G. This trigger output signal is sent via the processing steps 271, 268 to cause it outgoing processing step 286 indicates that the LUS-N signal shall begin so that the appropriate control valve can begin to be filled for to react for the 1-2 gear, which is faster than the 2-3 gear lingen. Assuming that normal exchange continues, at momcntnivan lay over 25 pound feet at the beginning, will the PTO shaft torque to continue to decrease to a level roughly 0.6 times the mean torque level, as shown at the time t3 in Fig. 8. the comparison circuit 264 the second trigger signal via the lead 274, which signal becomes low at time t3. as At this point, the other broadcasts shown in Fig. 9H. This trigger signal is sent via the processing step 287, rocker 288 and treatment step 284 to provide of a signal on line 252, which signal is also presented in Fig. 9L, to really close the loop and ensure that the system will work according to the principle closed loop. If the reduction in torque level is too clear to give an output signal from the second comparator then the loop slope will not initialize until at the time, for example, when a turn signal is generated by the comparator sen 263. as represented in Fig. 91. This occurs at a time, when the torque signal has reached its maximum value and at increased to approximately 20 cup pound feet above this minimum value and then increased to approximately 20 pound pounds above this minimum value. At time t5, when the PTO shaft torque tet ace »- has increased: iii approximately 0.8 of the mean; - torque level, at which the first trigger signal g @ n @ r @ r¿- 10 15 20 25 30 35 7907597-4 26 by the comparison circuit 265, the output signal from this control circuit again high to control the ramp reset, i.e. the relatively short increase in the ordinate value of the ramp, which is represented by the dashed curve between t3 and t5 in Fig. 8.

It should be emphasized that the sequence of just described channels from the comparator circuits 265, 264 and 263 appear only when the mean torque signal is above a preset reference level, which in the described preferred embodiment light was 25 bowl-pound feet. ”This indicates that closed-loop control of the gear unit is unnecessary and take state is recognized by the output signal on line 267 from the low torque comparison circuit 262. As shown in 9F remains signal level was low and gives a signal at the output side of flip-flop 282 to the line.283, said signal inhibiting the treatment step 284 and prevents the transmission of the output signal on line 252 to cause operation with the lid closed. Instead, signals were sent on line 251 to the upshift control arrangement 249. which has an open loop and is generally shown in Fig. 7, so that a conventional. timed shift sequence is achieved in A torque level below fig. for a controlled closed loop arrangement.

The customizable reinforcement / ramp program step 276 in Fig. 7 provides the required analog signals to be be used in the closed loop arrangement shown in Fig. 10.

These signals were then used to provide the pulse width modulation. signal on line 250 in Fig. 10, as described above, to regulate the torque level between times t5 and t6, as shown in Fig. 8. This allows the torque to much carefully follow the desired ramp slope, as indicated by it At time t6 or at incoming friction elements dashed line curve in Fig. 8. point 236 on the torque curve is or the coupling is completely locked. so that it does not occur> any further increase in the starting torque level and the torque as shown in the curve between the times t6 operation during nas in general. and t7. The control system according to the invention remains in this time interval, which allows a snow margin. so that it is not completely disconnected until the upshift-over-sign len LUS-D generated by the timing unit 308 (Fig. 1D) ~ .. -kvnaa fi wkwaæf ... sz '._..__ V ,, ~ _ _ 10 15 20 25 30 35 7907597-4 27 at the end of the waxing sequence ezier at time tv. _§ After considering the operation of the control system according to H the invention remains to be considered during a gear shift. operation during a downshift. At the moment it has shown be practical to base the control of a downshift on time considerations, which include three basic time periods there. The first time period. to be considered are accelerated .a h.: r ~ c .. ~ «rrYi-f-. ~, -ne-« ;. ._ , the service time of the motor drive shaft, which is to be accelerated to the new speed, after the load has been reduced at _ the beginning of the downshift. This acceleration time will denote fl nas both in this description and in Figures l3 and l5. The there is a certain amount of time required to drain the fluid from it piston, which is to disengage the outgoing element. and this time is called tea. The last time period, which is called acting, is that. required to fill the piston of the incoming element.- However, all of these times vary slightly depending on the speed. conditions of torque and torque at the time when the the gear ratio is initiated, the gear ratio, as the gearbox is in as well as the new gear ratio. to vil- the gearbox must be switched. Consequently, these are utilized different thiaspefibas in an initial calculation to determine according to which of the three principles the downshift will be regulated. These principles are referred to as Case 1, Case 2 and Case 3 to facilitate further discussion.

In the first case. wherein the initial calculation determines that the filling time tf is greater than the sum of the acceleration time ta and emptying time tea it is necessary to introduce a delay time eg in the system control algorithm. When the filling time is so long, the fluid it is inserted into the incoming element as soon as the the tiering signal was transmitted. The disconnection of the outgoing element however, the tea can not be started immediately, because tea is one much shorter time period. This would result in one too long time interval between the time of the outgoing element disconnection and re-transmission of power via the incoming the element. Consequently, the delay time, for example, must be added at initiation of the changeover before emptying can begin from the walking element. It is thus obvious that the desired the delay time in the first case shall be equal to the filling; the time ts minus the sum of the emptying and acceleration times. i. www. 10 15 20 25 30 35 7907597-4 28 In the second case, the filling time is shorter than the sum * ä of the training and acceleration times. To during these for-get stop setting the appropriate time control, the initiation is delayed ' of the filling of the incoming element slightly by time delay w ningsperioden td. This ensures that the correct time interval å will occur between the emptying of the piston of the expired-tf the element and the connection with respect to the incoming ele-. meant. The desired time delay in case 2 is equal to the sum man of the acceleration and emptying times minus the filling time for the incoming element.

In the third case, which is possible with the controlled the acceleration time is equal to or greater than the sum of filling time and emptying time. Consequently, it is only it is necessary to delay the commencement of the filling time by the delay time period e.g. In this third case, the calculation is the delay time equal to the acceleration time take minus the filling ningstiden tf. The logical signal flow for achieving these operating signals for regulating the start of the filling and the discharge times are shown in Fig. 13.

As can be seen, the electrical signals centers a moment. via line l05 to a step 340. which follows the transmitted torque level signal until the stage receives the downshift initialization signal LDS-R and at this time stores the signal and continuously presents it on the output line 341. In a similar manner, the speed signal is followed on line lD6 of the tracking / storage stage 342 and at taking the LDS-R signal, the instantaneous value is stored by the speed the signal to then be presented on the output conductor of the stage 343. This stored speed signal was sent to the engine inertia. torque step 344 and when the LD signal is received at it step (LD is a logic 1 signal during the 3-2 downshift and one logic 0 signal at the 2-l downshift) then the modified the signal from this step via line 345 to the plus input of each of the summation steps 346 and 347.

The homentin signal on line 105 was also transmitted to the negative the input connection of another comparator circuit 348. as at its positive input connection receives the stored torque signal determined by nalen. which has been reduced by one factor. 10 15 20 25 30 35 7907597-4 ae the setting of a potentiometer 350 or other signal g varying component. In one embodiment, this is set potentiometer to send a signal to the comparison circuit corresponding to approximately 65 Z of the level of the input signal which received by the potentiometer. This allows the comparison circuit 348 to function as a torque reduction comparator to produce an output signal, when the input torque at it negative connection has decreased to a level, which is 65 1 ~ _ _. «, _», \. Y, _ :. * "fïïïïï fl iš-l". 'íi-ïf_f -; * n “-“ f “* fv“ ïf' fl * f * = 'tšff fi fl * of the value stored on line 341. This torque reduction signal is sent as one of three inputs; 11s to a timer step 350. The timing step also receives other objections naler, e.g. the downshift initialization signal LDS-R in the first and the second case, as described above. The one on the cord The stored signal 341 is transmitted continuously via line 351 to the input terminal of a gate 352, which is "open" or transmitting a signal when it receives the gate control signal from the timer 350. The gate 352 output signal is sent via line 353 to the positive input terminal of a first comparator 354 and in addition to the the input terminal of another comparator 355.

The torque signal on line 341 was also sent to a step 356, which transmits an output signal representing the filling time required for the incoming element, to the negative input connection of the summing stage 346. On in the same way, the calculation step 357 leaves a signal which centers the sum of the filling time and the emptying time for both elements, to the negative input terminal of the summation stage 347 ning. Each of the calculation steps 356 and 357 is affected of the LD signal, which, as stated above, is a logic 1-signal only at 3-2 downshift. Summary step 346 output signal was sent both to the comparison unit 352, which was used to provide the LT-III signal, and to the inverting step 358. which was used to accomplish the logic L-111 signal 5aa: the third phase described above. pet torde it is observed that this signal was only sent to the timing increased 350.

The output of the second summing stage 347 is transmitted via one absolute value processing step 361 and via an inversion step 10 15 25 30 35 7907597-4 30 362 to the negative input terminal of the comparison stage 355. The output of the summing step 347 is transmitted directly via the buffer step 363 for providing the L-I / II logic signal.

Of the previous explanation regarding cases 1, 2 and 3 should The combinations shown in Figs. the logic signals indicated there be obvious how those in fig. used to achieve na. These logic signals are either an l- or a 0 signal depending on the conditions or the case obtained, as shown in the first six rows of the illustration shown in FIG. made the diagram. It is a relatively simple logical combination to produce the last two rows of the diagram, the rules signals LDS-F and LDS-N to regulate the output respectively the incoming element. In fact, would also treatment arrangements other than those. which are shown in FIG. can be used to work with torque and speed l3 and give influential signals for regulating incoming and output elements for the intended special downshift.

In order for the person skilled in the art to be able to manufacture and use the finding with the least possible experimentation is shown in Fig. 15 schematically a circuit for producing logic signals. as shown in the first six lines of the 14th those of the incoming and outgoing signals to the respective This circuit is especially applicable to it fig. the friction elements. the above description for case 3, when the total acceleration is greater than or equal to the sum of the filling times it and the emptying time. Because the circuit values are displayed for them different logic circuits and for the different flip-flops more skilled in the art to easily arrange from the above explanation. was used in many outgoing the term "connected" means the refers to a direct current connection between To that extent jande requirements so tvâ the components. a functional relationship between two components, components may be present between the two components. which be- is written as "coupled" or "coupled". components with virtual zero-DC resistance between The term "connected" indicates that it exists whereby other d has to ten S and 7907597-4 31 Although only a particular embodiment of the invention described and defined, it should be obvious various modifications and changes may occur. Intentional is therefore to cover aïla such modifications in the requirements changes within the scope of the inventive idea. a __'_ I '«: f_ ;:« ¿;: _- ¿,': F _ ~ f; g »'» _ a:. ~ __.-, ..'-... «' , __ *:, _; \ _. 4 - ~ A, 31 ... k ».» ¿A., , -.... V = sí, _ ..¿ »-

Claims (5)

10 15 20 25 30 7907597-4 '32 pxrmrxmv A control system (100) for controlling gear ratio changes in a multi-speed automatic transmission (101), which is connected between the engine and a mechanical output drive connection (103), which gearbox has at least three forward gears, can be drawn wherein it comprises: a gear ratio command means (121) operable to provide a ratio change command signal (LA, LB) upon receipt of input signals comprising area selector information (at 107); a logic monitoring circuit (123) connected to receive the ratio change order signal and the area selector information (LD) and provide a shift initiation signal (LUS-R or LDS-R) when a gear change is indicated; a gear control circuit (125) connected to control all upshifts and a downshift control circuit (126) connected to control all downshifts, each connected to provide a gear quality control signal upon receipt of the corresponding gear initiation signal from the logical monitoring circuit; and a logic direction circuit (124) connected to receive said shift initiation signal (LUS-R or LDS-R) from the logic monitoring circuit, the area selector information (LR, LD) and said shift quality control signals (from 125 or 126) and operating to provide selective output signals (at 113, 114, 115), which regulate the respective selected means (V1, V2, V3) to bring the automatic transmission to the desired gear ratio. Control system according to claim 1, characterized in that the shift ratio command means comprises a shift point computer (121) connected to receive a first input signal (110), which varies as a function of torque requirements, a second input signal (from 120), which includes said range selector information, and a third input signal (on 122), which varies as a function of the speed of the mechanical output drive connection, the switching point computer operating to produce the relative change order signal. 3. A control system according to claim 1, characterized in that the gear ratio command means comprises a manual gear selector arrangement (for example 108) for receiving a first input signal, which indicates a desired gear ratio, and a second input signal (from 120), comprising said range selector information . Control system according to claim 1, characterized in that the upshift control circuit (125) is connected to provide a shift-end signal (LUS-O) for the logic monitoring circuit at the end of a shift change frequency. Control system according to claim 1, characterized in that the downshift control circuit (126) is connected to provide a shift-end signal (LDS-O) for the monitoring logic circuit at the end of a downshift change frequency.