JPS5920904B2 - automatic transmission control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to setting a range select stage in an electro-hydraulic automatic transmission control device that can be applied to vehicles, particularly construction vehicles such as motor scrapers and off-the-road dump trucks.

Motor scrapers, off-the-road dump trucks, etc. use torque converters with direct coupling clutches and multi-stage gear transmission devices, and bulldozers, etc. use direct-drive multi-stage gear transmission devices without torque converters (this type is used in gas turbine engines). However, the electro-hydraulic automatic transmission control device according to the present invention will be even more effective if applied to these construction vehicles.

Construction vehicles are subject to sudden changes in load during work and sudden changes in running resistance on the road at work sites, so in many cases a 6-speed transmission is used to transmit high torque.
, 8 or 10 stages are used.

In an automatic transmission using such a multi-stage gear transmission device, the automatic gears are naturally multi-stage, but if the number of range select stages for selecting the automatic transmission range is the same as the number of gear stages, The operator is likely to be confused as to which range selection stage to select.

Therefore, in order to reduce the operator's judgment, it is preferable that the range select stage has a range select lever pattern similar to that of a general passenger car even if there are multiple gear stages.

In Japan, the select lever pattern of automatic transmissions is legally regulated, and the shift order is P (parking) - R (reverse) - neutral (N) - D (drive range). .

Here, the range select stage must be set according to the maximum vehicle speed of the vehicle, but the maximum vehicle speed for a construction machinery vehicle is at most around 60Ax/h, and the reason why all stages are equipped with range select is for the reason mentioned above. There is little need for this.

Therefore, even if the gears are multi-stage, for example, P-R-N-
It is sufficient to use a style of D-2-1 and set the automatic transmission range to three D-2-1.

Here, 2 corresponds to the second range select stage (position), and 1 corresponds to the second range select stage (position).

The problem here is which speed stage of the multi-speed transmission should be assigned to each of the limited number of range select stages.

The highest speed gear of the multi-speed transmission is assigned to the drive range D, but the intermediate range select gear must be determined in consideration of the relationship between the maximum vehicle speed of the vehicle and the reduction ratio of each speed gear.

Therefore, even if the number of gear stages is the same, if the specifications of the multi-stage transmission (maximum vehicle speed, reduction ratio, etc.) change, it may be necessary to change the speed stage corresponding to each range select stage.

However, in such a case, it would be very uneconomical if the specifications of the automatic transmission control device had to be changed significantly.

Also, the range select lever pattern (P-
R-N-D-2-1) or the number of range select stages is preferably the same no matter how the number of gear stages of the multi-stage automatic transmission changes.

For example, if the range select lever pattern were to change depending on the model of the vehicle, it would place a heavy burden on the operator, so the range select lever pattern needs to be unified.

As an example, regarding an automatic transmission with 6 forward speeds and an automatic transmission with 8 forward speeds, the format of the range select speed is P-R-
Let us consider the case where the format is unified to ND-2-1.

The maximum vehicle speed when the 6-speed forward automatic transmission and the 8-speed forward automatic transmission are set to drive range D shall be set to the same degree, and the vehicle speed when set to the 2nd range select gear 2 and the 2nd lunge select gear 1 shall also be set. It shall be set to the same degree.

Therefore, due to the relationship of the reduction ratio of the transmission, the relationship between the range select gear and the actual speed gear in the 6-speed forward transmission and the 8-speed forward transmission will be different.

For example, when the drive range of a six-speed forward automatic transmission is six forward speeds, the second range select speed 2 is four forward speeds, and the first lunge select speed is one forward speed,
The drive range D of the automatic transmission is 8 forward speeds, the 2nd range select speed is 5 forward speeds, and the 2nd range select speed is 1 forward speed.
It's fast.

In this way, if the number of gear stages in the multi-stage automatic transmission differs, the speed stages corresponding to the range select stage will differ.

Therefore, in the automatic transmission control device, it is necessary to perform control so that a predetermined speed gear corresponding to the number of gear shifts of the multi-stage transmission to be controlled is selected in correspondence with a predetermined range selection gear.

Therefore, the configuration of the automatic transmission control device naturally differs depending on the number of gears and the maximum vehicle speed of the multi-speed transmission to be controlled.

However, it is undesirable from the point of view of cost, productivity, etc., for the configuration of the automatic transmission control device to differ greatly depending on the number of gears even though the multi-speed transmissions are the same.

The present invention has been made in view of the various circumstances described above, and is configured so that the speed gear selected corresponding to each range selection gear (the highest speed gear of the selected range) can be easily changed in an automatic transmission control device. However, it is an object of the present invention to provide an automatic transmission control device that can be applied to any multi-speed transmission with only slight changes.

According to the present invention, a signal representing the range select stage selected via the range select lever is added to a code conversion circuit consisting of a diode matrix circuit, etc. It is configured to convert to a binary signal representing the highest speed gear.

Here, depending on the configuration of the code conversion circuit, it is possible to convert the range select gear selection signal into a signal representing an arbitrary maximum speed gear. The control device can be applied to a multi-speed transmission having any number of gears.

In an automatic transmission control device, changing the configuration of a code conversion circuit or replacing a unitized code conversion circuit is an extremely easy task.

To explain in more detail the configuration of the automatic transmission control device of the present invention, it generates upshift pulses or downshift pulses in response to electrical signals depending on vehicle running conditions such as engine throttle opening and torque converter output shaft rotation speed. , incrementing or decrementing the counting contents of a counting circuit that designates the speed stage to be selected in a multi-stage transmission by the pulse, comparing the output of the code conversion circuit with the output of the counting circuit by a comparator, and determining the contents of the counting circuit. controls the counting operation of the counting circuit so that the speed does not exceed the speed stage set in the matrix circuit corresponding to the range select stage selected by the range select lever; Automatic gear shifting is performed within a gear shifting range with the upper limit set at the highest speed stage.

Examples of the present invention will now be described in detail with reference to the accompanying drawings.

In the practical example shown below, the counting circuit according to the present invention corresponds to the automatic shift counter 138 shown in FIG. 3 or 14, and the code conversion circuit corresponds to the automatic shift counter 138 shown in FIG. 3 or 14. diode matrix 114
or 114', and the comparator corresponds to the comparator 126 shown in FIG. 3 or 4.

First, an example in which the present invention is applied to an automatic transmission with six forward speeds will be described.

FIG. 1 is a principle diagram of a transmission device to which the present invention is applied,
The mechanical transmission system from the engine 10 to the transmission output shaft 12 is diagrammatically abstracted.

Engine 10 drives engine drive shaft 11 and torque converter 15 .

The torque converter 15 is well known, and the pump impeller 2
2, a stator 24, a one-way clutch 25, a turbine impeller 23, and a direct coupling clutch 16 for increasing power transmission efficiency.

The direct connection crack 16 directly transmits the power from the engine 10 to the input shaft 13 (output shaft of the torque converter) of the six forward gears and one reverse gear gear transmission 21, and connects the clutch cylinder Dc (see Fig. 2). By operating with fluid, the friction portion 18 is pressed against the clutch plate 17, and the pump impeller 22 and the turbine impeller 23 are directly connected.

Number 26 indicates a portion of the torque converter housing.

The output shaft 13 of the torque converter drives a carrier 28 of a planetary gear group 27 for switching between high speed H1 and low speed L1.

This planetary gear 27 connects the sun gear 29 to the clutch 31.
A low-speed gear ratio is provided by connecting the torque converter output shaft, that is, the transmission input shaft 13, via the clutch drum 32 and the clutch drum 32.

Clutch 31 is engaged by clutch cylinder L (FIG. 2).

The high-speed drive by the planetary gear 27 connects the sun gear 29 to the transmission housing 34 via the disc brake 33 engaged by the clutch cylinder H (FIG. 2).
This is done by fixing it to

Ring gear 30 drives intermediate shaft 14 .

The intermediate shaft 14 is connected to sun gears 39, 40° 41 of planetary gear groups 35, 36, 37 and a clutch drum 38.

The carrier 42 is one ring gear 4 of the planetary gear group 36.
3, and the carrier 44 is connected to the transmission output shaft 12 while driving the reverse double planetary gear group 37.

For low speed gear ratio, clutch cylinder 1c (Fig. 2)
operates the disc brake 47 and connects the carrier 42 and ring gear 43 to the housing 34 via the disc brake 47.

For medium speed gear ratio, clutch cylinder 2c (Fig. 2)
operates the disc brake 48 and connects the ring gear 46 to the housing 34 by the disc brake 48 .

In the case of high-speed direct drive, the clutch 49 is engaged by the clutch cylinder 3c, and the intermediate shaft 14 and output shaft 1
2 is connected via a clutch 49.

The reverse double planetary gear group 37 obtains a reverse gear ratio by connecting the ring gear 45 to the disc brake 50 through a clutch cylinder Rc (FIG. 2).

In this way, six forward speeds and one reverse speed speed are obtained by operating the clutch cylinder 1c=H corresponding to the gear group described above, and by selecting clutch engagement according to the combinations shown in Table 1.

The direct coupling clutch 16 is operated by automatically operating the clutch cylinder Dc when the rotation of the gear 19 mounted on the torque converter output shaft 13 reaches a set rotation speed.

The speed sensor 20 detects the number of teeth of the torque converter output shaft=transmission input shaft rotation detection gear 19.

The throttle sensor 90 detects the output state of the engine,
This is for determining the shift point according to the load ratio of the engine, and provides a throttle opening detection signal to the electronic control unit 200 according to the throttle opening.

The range select lever 100a is in the parking position P,
Reverse position R1, neutral (neutral) position N,
The drive range D1 is a lever for manually selecting the second range select position 2 or the lunge select position 1, and a range select sensor 100 is provided corresponding to each position P to 1 of this lever 100a.

The range select sensor 100 is made up of a group of switches corresponding to each position P to 1 of the lever 100a and linked to lever operation, and provides a signal to the electronic control section 200.

The electronic control unit 200 includes the three elements described above (sensor 20.9).
0,100) to automatically shift control each solenoid 81 to SD shown in FIG.

The configuration and operation of this electronic control section 200 will be explained with reference to FIG.

Each clutch cylinder 1. c-Dc is operated by pilot operating a shift valve group 51 shown in FIG. 2 by a selector valve group 52.

Each selector valve has solenoids S1, S2, S3,
They are operated by SR, SL, and SD, respectively, and the relationship between each speed stage and solenoids 81 to SD is shown in Table 2.
As shown below.

The drive pump 53 shown in FIG. 2 is connected and driven by the engine 10 through a gear system (not shown), and sucks up fluid in the reservoir 54 through a suction conduit 56 with a strainer 55.

Pressure fluid from pump 53 flows through filter 57 to branched conduit 59 from conduit 58 and is supplied to shutoff valve 60.

The purpose of insertion of the shutoff valve 60 is to compensate for the pressure inside the conduit 58 due to a drop in the discharge amount of the pump 53 when the engine 10 is idling, and to prevent shock during gear changes.

Modulation IJ IJ-Prevents a pressure drop in the conduit 58 due to the operation of the IJ valve 61, and shifts the shift valve group 51.
prevent the control from being disrupted.

The other movement is caused by the force of the coil spring 62 on the spool 63.
Generates a force that constantly pushes the valve into the closed position.

When the pressure in the conduit 59 drops below the set pressure (this also applies when the pressure in the conduit 64 drops), the coil spring 62
The force causes the spool 63 to be pushed into the closed position.

However, when the pump 53 is rotating at the normal rotation speed, the pressure inside the conduit 59 is higher than the set pressure, so the spool 63
moves from the closed position C to the open position O against the force of the coil spring 62 to connect the fluid in the conduit 59 to the conduit 64.

Pressure fluid in conduit 64 is supplied to each clutch cylinder 1c, 2c.
, 3c, Rc.

This is the supply line that operates Dc, L, and H.

Normally, the fluid in conduit 64 is relieved by modulation relief valve 61, and the fluid is the source of fluid for driving torque converter 15.

The fluid in the conduit 64 is supplied via a direct clutch switching valve 65 and a reverse clutch shift valve 66 to a high speed direct drive clutch shift valve 67, a medium speed clutch shift valve 68, and a low speed clutch shift valve 69.

Furthermore, the fluid in the conduit 64 is supplied to the timing pressure valve 7.
0 through high speed H/low speed L latch shift valve 71
The fluid is supplied to the clutch cylinder H□ or L selectively.

As shown in the figure, the timing pressure valve 70 is a valve with an orifice, and when the H/L clutch shift valve 71 is activated, the timing pressure valve 70 uses the pressure difference between the inlet side pressure cuff 6 and the outlet side pressure 15 of the valve 70 to move from position a. b, lowers the pressure in the conduit 64 by draining the vent 74 of the modulation relief valve 61, and drains the outlet side pressure cuff 5 and inlet side pressure cuff 6 of the valve 70.
When the pressure difference becomes smaller, the vent circuit 74 returns to position a.
Gradually increase the pressure.

This also gradually increases the pressure in conduit 64, reducing torque fluctuations that occur during clutch engagement and preventing shift shock.

The fluid in the pump discharge side conduit 58 flows through the reducing valve 7
2 to a constant pressure, and is supplied to the shift valve group 51 via a conduit 73 as a reference pressure for shift valve control for selectively switching each clutch.

Since each shift valve group is controlled in the same manner,
The switching of the H/L valve 71 will be explained below as an example.

The valve 71 has positions a and b, and a spring 79 normally pushes the spool to the a position (when the solenoid SL is not energized).

Therefore, when the solenoid SL is de-energized, the clutch cylinder H operates.

Reference pressure fluid in conduit 73 is supplied to pressure chamber 77 of valve 71 .

On the other hand, the reference pressure passes through the orifice 80 to the spring chamber 78.
It is also supplied to

The fluid in the spring chamber 78 is also connected to a selector valve 81.

The selector valve is a one-way solenoid valve with two positions C and O. When the solenoid coil SL is off, the valve 81 is in the closed position C due to the force of the spring 82, but the solenoid coil SL is energized. and switch to the open position O, allowing the fluid in the spring chamber 78 to flow into the passage 84.
Drain.

Here, since the fluid is squeezed by the orifice 80, the pressure in the sprue and ring chamber 78 decreases, and the reference pressure in the chamber 77, which resists the spring 79, causes the spool of the valve 71 to
position, the fluid in the clutch cylinder H is drained, and the fluid in the conduit 75 is not supplied to the clutch cylinder L.
Power shift the transmission 21.

Other clutch cylinders Ic, 2c, 3c, Rc, D
Similarly, solenoid 81.c is also connected to solenoid 81.c. S2. S3. It is actuated by energizing SR and SD, and selects a predetermined speed stage as shown in the above-mentioned Speed 1 and Table 2.

FIG. 3 shows a practical example of the electronic control section 200 in the electro-hydraulic automatic transmission control device of the present invention.
).

Therefore, the part indicated by the dashed-dotted line 200 in FIG. 3a and the part indicated by the dashed-dotted line 200 in FIG.
00.

Although the power supply circuit is not shown, a reference voltage of 12 volts DC is supplied to each circuit from a 24-volt DC vehicle battery through a constant voltage circuit.

As shown in FIG. 4, the speed sensor 20 includes a high frequency oscillation circuit 201 including a pickup coil, a detection circuit 203 connected via an output line 202 of the high frequency oscillation circuit 201, and a line 2 on the output side of the detection circuit 203.
04, and a rectangular wave shaping gate 205 connected through 04.

The speed sensor 20 outputs the same number of pulses as the number of protrusions to the line 206 according to the proximity of the protrusions of the gear 19.

This pulse has a voltage waveform as shown in FIG.

As a result, a rectangular wave pulse signal having a period proportional to the rotation speed of the torque converter output shaft 13 is outputted from the speed sensor 20 and inputted to the rotation speed comparison circuit 92 via the line 206.

The throttle sensor 90 is a multi-contact switch group as shown in FIG.

Movable piece 9 that moves in response to the throttle opening of the engine 10
The movable contact 90e connected to 0f is connected to the lines 90a to 90.
d selectively engages the fixed contact corresponding to output line 9.
0a.

A signal voltage corresponding to the throttle opening is generated at 90b, 90c, and 90d.

For example, when the throttle opening is O (idle), line 9
A signal is generated at 0a, a signal is generated at line 90b where the throttle opening is slightly above idle, and the throttle opening - (
A signal is generated on line 90c when the throttle opening is from half-open to full-open, and a signal is generated on line 90d when the throttle is at the maximum throttle opening (detent) above full-open.

The output of the throttle sensor 90 is supplied to a throttle position detection circuit 91.

In the throttle position detection circuit 91, output lines 90a and 90b of the throttle sensor 90.

The signal 90c is input to a latch circuit 910 using a D latch and stored.

The latch release pulse generation circuit 911 can use a circuit such as a differential circuit, and the throttle sensor output line 9
A change in the throttle position is detected by inputting signals 0a to 90d, and a pulse is generated.

This pulse is applied to the latch circuit 910, and the latch circuit 9
10 and stores the new signals on lines 90a-90c in latch circuit 910.

In this way, each time the throttle opening changes, the latch circuit 9
10 memories are rewritten.

The signal of the maximum throttle opening (detent) on the output line 90d is not stored in the latch circuit 910, but is directly input to the rotation speed comparison circuit 92 as the throttle signal T)(3).

Further, the signal on line 90d is inverted by inverter 912 and becomes one input of AND circuit 913.

The output 910c of the latch circuit 910, which stores the signal on the output line 90c corresponding to the slot opening below the maximum throttle opening, that is, from throttle half to full, is added to the other input of the AND circuit 913.

Note that the output 910c of this latch circuit 910 is configured so that the memory is not erased even if the output of the throttle sensor 90 changes from line 90c to line 90d, and the throttle signal TH3 is generated (when it is "1"). The output of the AND circuit 913 is 0 due to the action of the inverter 912.
”, but the output of the throttle sensor 90 is on line 90.
As soon as there is a change from line d to line 90c, AND circuit 91
The output of 3 is ev 1 ty.

The output of this AND circuit 913 is applied to the comparison circuit 92 as a throttle signal TH2.

In addition, output lines 90a, 90 of the throttle sensor 90
The output of the latch circuit 910 storing the signal b is the throttle signal THo.

It is added to the rotation speed comparison circuit 92 as THL.

In addition, in this example, the throttle sensor 90 is configured so that the signal on the output line 90b (slightly above idle) of the throttle sensor 90 is not used, but the signal on the line 90a (idle) is stored as the throttle signal TH1. Connect the throttle position detection circuit 91.

Therefore, throttle signal THo is not used by diode matrix 926, which will be described later.

However, the output line 90 of the sensor 90 is not limited to this example.
Using all a to 90d, throttle signal THo to T
Although all of H3 can be used, it will not be explained in detail here.

The latch circuit 910 is 5CL4042A type or R manufactured by Solid State Scientific.
It is preferable to use an integrated circuit such as the CD4042A model manufactured by CA.

The rotation speed comparison circuit 92 includes an 8-bit binary counter 920.
, shift-up comparator 921, shift-down comparator 922, shift-down inhibit comparator 923, torque converter (abbreviation for torque converter) lock-up release comparator 924, torque converter lock-up comparator 925, throttle signals TH6 to TH3. a diode matrix 926 that inputs and encodes it into binary data corresponding to a predetermined set rotation speed, and a diode matrix 92 that provides reference data corresponding to the set rotation speed to comparators 923 to 925.
7, and a diode matrix bias resistance group 928
Equipped with.

As the binary counter 920, for example, an integrated circuit of type 5CL4585A manufactured by Solid State Scientific Corporation can be used, and each comparator 921
~925, for example, MC14585A manufactured by Motorola.
It is possible to use a type of 4-bit magnitude comparator cascaded to form 8 bits.

Clock pulse generation circuit 93 periodically provides a reset pulse to counter 920.

Therefore, the generation interval of this reset pulse is determined by the counter 920.
The counter 920 counts the number of pulses supplied from the speed sensor 20 during this reference time.

The counting output of the counter 920 becomes one input A of each of the comparators 921 to 925.

A diode matrix 926 is connected to the other input B of the shift-up comparator 921 and the shift-down comparator 922.
The value preset in is the throttle signal THo-TH3.
It has been added in response to the outbreak.

Further, a value preset by a diode matrix 927 is added to the other input B of the comparators 923 to 925.

The rotation speed comparison circuit 920 calculates the rotation speed of the transmission input shaft 13 (
An upshift pulse or a downshift pulse is generated according to the shift pattern shown in FIG. signal or torque converter lockup release signal.

In FIG. 7, line 931 is a downshift line, line 9
32 is an upshift line, line 933 is a downshift inhibit line 1, 1934 is a torque converter lockup puller/I'7, and line 935 is a torque converter lockup release line.

The diode matrix 926 is configured to encode the input throttle signals TH1 to TH3 into a value corresponding to a predetermined set rotational speed according to the shift pattern of lines 931 and 932 as shown as an example in FIG. 7, and input the encoded value to the comparator 92L922. has been done.

Also, the diode matrix 927 is connected to the line 933 in FIG.
, 934 and 935, respectively, are input to comparators 923, 924 and 925.

The throttle signal TH1 is generated until the throttle opening changes from idle to half (-!-), and the throttle signal TH2 is generated from the throttle opening half to just before the detent position.

The throttle signal TH3 is generated only when the throttle opening is at the detent position.

When reducing the throttle opening, the throttle signal TH
2 occurs until the throttle opening reaches idle and before the idle contact (line 90a) of the throttle sensor 90 is activated.

In the case of FIG. 7, the downshift setting rotation speed when the throttle signal TH1 is generated is 1150 rpm,
The upshift setting rotation speed is 1900 rpm.

Also, when the throttle signal TH2 is used, the downshift is 1.
35 Orpm, upshift is 210 Orpm.

When throttle signal TH3, downshift is 1600
rpms upshift is 235 Orpm.

The output of each comparator 921 to 925 is output to an AND circuit 94 to 98
In addition, a reset pulse from clock pulse generation circuit 93 is applied to other inputs of AND circuits 94 to 98 via line 930.

Therefore, each shift pulse is taken out from interposed comparators 921-925 via AND circuits 94-98 in synchronization with the counting reference time of counter 920.

In this way, since the rotation speed comparison detection in the comparator circuit 92 is performed every reference time of the counter 920, the counter 9
The counting of the number of input pulses from the speed sensor 20 at 20 is averaged over a reference time so that the response to uneven rotation becomes slow.

The upshift comparator 921 produces an output when the current rotational speed input A from the counter 920 becomes greater than the set value input B from the diode matrix 926 (A2B).

This output is supplied via an AND circuit 94 to a line 94a as an upshift pulse.

The downshift comparator 922 produces an output when the current rotational speed A from the counter 920 becomes smaller than the set value B from the diode matrix 926 (A≦B), and this output is passed through the AND circuit 95. It is provided as a downshift pulse on line 95a.

The comparator 923 for shift down inhibit is connected to the line 933 set by the current rotational speed human power A using the diode matrix 927.
If it is smaller than the set value B shown in (A2B), the output el
11+, the output of which is supplied via AND circuit 96 to line 96a as a downshift inhibit signal.

When the signal on line 96a is "0", forced downshift, which will be described later, is prohibited.

Torque converter lock-up comparator 925 detects (A
2B) Generates an output and sets flip-flop 99 via AND circuit 98.

As a result, the signal on line 99a becomes 1'' and becomes a lockup command signal.

The lock-up release comparator 924 indicates that the current rotation speed A is line 93.
When the rotation speed becomes smaller than the set rotation speed B shown in 5 (A≦B),
The flip-flop 99 is reset via the AND circuit 97, and the lock-up command on the line 99a is released.

The lines 94a-99a of FIG. 3a are connected to the same lines 94a-99a of FIG. 3a.

The range select sensor 100 is a select lever 100a
This is a group of switches operated by the switch, and the contact configuration thereof is shown in FIG.

The contacts of each switch are located at each position of the select lever.
That is, they correspond to a parking position P1, a reverse position R, a neutral position N1, a drive range D, a second range select position 2, and a lunge select position 1.

In the automatic shift range, operate the select lever 100a to select drive range D or range select position 1,
Turn on each switch of 2.

OFF to detect the selected range select stage,
Set the upper limit for upshifting.

Signal lines 101-105 connected to each switch
is input to the range select detection circuit 107.

The range select detection circuit 107 uses a memory circuit 1 called a D latch to prevent malfunctions due to input signal chattering.
08 is used.

It is appropriate for this circuit 108 to use an integrated circuit 5CL4042A type or CD4042A type having the same configuration as the latch circuit 910.

In response to changes in the signals on lines 101-105, differential pulse generation circuit 109 generates pulses that are used to reset latches in memory circuit 108 via line 110.

Therefore, for example, when the range select command moves from position (second range select stage) to position 2 (second range select stage), the memory circuit 108 is reset only after the signal on line 102 is input, and the signal on line 102 is stored. death,
Range select command signal 2R for position 2 is output.

That is, the select lever 100a is moved from position 1 to position 2.
The circuit configuration is such that the range select command holds the signal 1R at position 1 after the detection switch at position 1 in FIG. 8 is turned off until the detection switch at position 2 is turned on.

Therefore, even while the lever 100a is being moved, the range select command from the memory circuit 108 is not interrupted.

Flip-flop 111 is used as a memory when changing the shift mode in automatic gear shifting.

The range select finger 'IR corresponding to the lunge select position 1 of the select lever 100a is connected to the flip-flop 11.
The neutral command NR corresponding to the neutral position N is the reset input.

When the select lever 100a is set to the neutral position N, the neutral signal NR output from the memory 108 is 1'', and the flip-flop 111 is reset.

Therefore, the reset output of flip-flop 111 is '1''
and the signal on line 142 is 1”, inverter 125
The signal on line 141 after passing through is 0''.

The signals on lines 141 and 142 are automatic shift counter 1
3B preset data input.

Automatic shift counter 138 receives signal power i on line 141.
When the signal power of line 142 is st'll'' at No'', the preset data is 10'' in binary and 12 in decimal.
”.

Also, the signal on line 141 is "1'" and the signal on line 142 is "1'".
When the signal is “O”, the preset data is binary 01.
'', which is 1-tJ in decimal.

This is shown in Table 3. Table 3 Therefore, when the flip-flop 111 is not set (reset), the preset data of the automatic shift counter 138 is decimal "2".

When the range select lever 100a is set to the lunge select position 1, the flip-flop 111 is set by the range select finger 4>IH, the signal on the line 142 becomes n Oyt, and the signal on the line 141 becomes "1 n".

This flip-flop 111 is set in the lever 1
Even if 00a moves to position 2 or position N
Persistent unless moved.

Therefore, in this set state, the automatic shift counter 13
The preset data for 8 is 11 in decimal.

A reversible counter with a preset input is used as the automatic shift counter 13B.

As these various reversible counters, for example, integrated circuits of the type HD74193 manufactured by Norris Corporation may be used.

The contents of the counter are preset by preset data from lines 141 and 142, and the counted contents are output from binary 4-bit output lines 12γ, 128, 129, and 130.

The count of the counter 138 corresponds to the speed gear specified for the multi-gear transmission 21 (FIG. 1), as will be described later.

Therefore, when the automatic shift counter 13B is preset to decimal "1", the binary number lines 121 to 13
Data of 0 specifies 1st speed J in decimal notation.

Further, when the counter 138 is preset to decimal "2", the data in the binary advance car lines 127 to 130 designate "second forward speed".

Therefore, when the range select lever 100a is moved from the neutral position N to the drive range D or the second range select position 2 at the time of starting, the flip-flop 11
Since 1 is not set, the forward 2nd speed command is set to counter 1.
Output from 3B.

In this way, when the lever 100a is operated without passing through the lunge select position 1 (N→D or N→D→2
, or sequential operations such as N-+D → 2 → D), the automatic transmission will start from 2nd forward speed, and the automatic transmission will be from 2nd forward speed to 4th forward speed (described later) or automatic transmission from 2nd forward speed to 6th speed. This means that the shift mode in which the gears are changed has been selected.

On the other hand, when the range select lever 100a is moved from the neutral position N to the range select position 1, the flip-flop 111 is set, so that a first forward speed start command is output from the counter 13B.

In this way, when the lever 100a is operated via the lunge select position 1 (N→1 or N-+1-)
D or N → 1 → 2, etc.), automatic shifting occurs by starting in forward 1st speed, automatic shifting from 1st forward speed to 4th forward speed (described later), or automatic shifting from 1st forward speed to 6th forward speed. This means that you have selected a shift mode in which this occurs.

As described above, the shift mode can be changed by simply operating the lever once through the lunge select position 1.

Of course, instead of using the range select commands IR and NR as inputs to the flip-flop 111, a special shift mode selection switch (not shown) is provided, and the flip-flop 111 is set and reset by the signal from this switch. Good too.

Further, in this embodiment, the shift modes are 1st forward speed start and 2nd forward speed start, but the shift mode is not limited to this.

Further, in this example, there are two selectable shift modes, but the number of selectable shift modes may be increased if necessary.

In that case, the necessary preset data for the automatic shift counter 138 may be created by combining a storage circuit such as a flip-flop or a register with an appropriate logic circuit.

Note that the range select command 42B corresponding to the second range select position 2 and the range select command 3R corresponding to the drive range D output from the memory circuit 108 are input to the NAND circuit 124 via the OR circuit 123.

The other input of the NAND circuit 124 is the reset side output (unset) of the flip-flop 111.
”) and a signal on a line 155 corresponding to the second forward speed from a decoder 153, which will be described later, are added.

As mentioned above, if the flip-flop 111 is not set, this means that the [shift mode for 2nd forward speed start] has been selected, and in this state, when the speed gear reaches 2nd forward speed, the signal on line 155 becomes "1 P+". , NAND circuit 124
The output becomes “0pa”.

The output of the nut circuit 124 is an automatic shift counter 138.
Since it is input to the AND circuit 140 which supplies the down pulse to the NAND circuit 124, the AND circuit 140 becomes inactive, and the output power of the NAND circuit 124, NOP+, prevents the output of the "down pulse".

Therefore, when the [2nd forward speed start shift mode] is selected, the transmission 21
When the speed reaches the second forward speed, no further downshifts are performed and the lowest speed is limited to the second forward speed.

When the lever 100a is operated via the lunge select position 1, the flip-flop 111 is set as described above, so the output of the NAND circuit 124 is "1", and automatic downshifting to the first forward speed position is performed. is possible.

Therefore, in the case of the "shift mode for starting in the first forward speed", the lowest speed stage is also the first forward speed.

The upper limit of automatic upshift is range select lever 10.
It is determined by the current operating position of 0a.

Range select A? 1R and the set output IR' of the flip-flop 111 are applied to an AND circuit 112, and the signal on its output line 116 is supplied to a diode matrix 114 of a range select circuit 113.

The range select command 2R is applied to the diode matrix 114 via line 11γ, and is applied to the select lever 100.
The range select 4>3R output from memory circuit 108 when a is set to drive range D is applied to diode matrix 114 via line 118.

The diode matrix 114 sets the upper limit of eight speed stages in automatic shifting, that is, the range select stage, in correspondence with the position of the range select lever 100a.

In the case of the 6-speed automatic transmission of this embodiment, the upper range select position 1 of the range select lever 100a is set to 1st forward speed, the upper limit of the 2nd range select position 2 is set to 4th forward speed, and the drive range D is set to forward speed. The upper limit is 6th speed.

Therefore, line 116 is range select 4>IR, line 117 is range select command 2R, line 118 is range select! , l, the matrix 114
Each diode is connected to produce an encoded output as shown in the table below.

That is, in response to commands IR, 2R, 3, and R, binary codes corresponding to the respective range select maximum speed stages F1 (1st forward speed), F4 (4th forward speed), and F6 (6th forward speed) are output. .

Table 4 In Figure 3, the cathode of the diode is connected to line 116.
117 or 118 and diode matrix 1
Since the configuration is such that a positive voltage is applied to the line 14 through the pull-up resistor 114a, each line 116, 117
, 118, inverters 116a, 11γa, and 118a are inserted.

However, instead of providing an inverter, the resistor 114a may be grounded and a diode may be provided at 1'' in Table 4.

The binary code AO+A1 y A2 + A3 (A) outputted from the diode matrix 114 is input to the comparator 126, and the binary code B representing the current speed stage of the transmission 21 is applied from the automatic shift counter 138.

, B1. B2. Compare with B3(B). Comparator 126 is activated if input A from diode matrix 114 is greater than input B from counter 138 (A>B).
, produces a signal ITl'' on output line 131.

When the signal on line 131 is °l t+, it indicates that the current speed gear [F] is lower than the upper limit speed gear (A) set by the range select lever 100a, and this signal is transmitted by the AND circuit. The performance is to generate a 1-up pulse when other conditions of the same circuit 139 are satisfied.

Also, when input A of comparator 126 is smaller than input B (A<B), a signal "1" is produced on output line 132.

This indicates that the current speed stage ■ is higher than the upper limit speed stage ■ set by the lever 100a, and line 132
The signal SS 1 // is added to the AND circuit 145 and
request that a "forced downshift" be performed.

Also, the signal on line 132 is inverted by inverter 143 and applied to AND circuit 146 via line 144, [
AND circuit 14 on the condition that it is not forced downshift J
6 is enabled, and in response to a signal from line 95a, "
A downshift pulse J is provided.

In addition, as the comparator 126, for example, Motorola (
Motorola) MC14585 series 4
A bit comparator integrated circuit may be used.

When the range select lever 100a is in the manual range position (N, R, or P) via the neutral position N, the flip-flop 133 is reset by the signal on the output line 104 at the neutral position N. The set output becomes 10, and a signal '' is sent to the line 134 via the inverter 134a.
1 is given, and the counter 138 is cleared by the signal 11 on this line 134 (see FIG. 9C).

At this time, the output of the counter 138 (lines 127 to 130
) are all 10〃, and all the outputs of the decoder 153 are also 10〃.

When the range select lever 100a moves from the neutral position N to the drive range D position, the line 103
The flip-flop 133 is set by the signal.

Therefore, the reset output of flip-flop 133 is 10
The signal 11 rises on the line 135 via the inverter 135a, and a differential pulse is generated from the differentiator circuit 136 as shown in FIG.

This differential pulse is sent via line 137 to counter 138.
load input, and causes the counter 138 to read the preset data given to lines 141 and 142.

At this time, the flip-flop 111 is not set and is in the [forward 2 speed start mode], so line 1
The binary signal of 41,142 is 110, and its upper 2
Bit c.

+D□ is always 0, so the preset data '0010// (see Figure 9C) is stored in the counter 138.
loaded into.

Therefore, the output of counter 138 (lines 127-130
) is preset to the value '0010〃 (9th
(See Figure C).

Thereafter, when an up pulse is applied to the counter 138 from the AND circuit 139 (Fig. 9e), the contents of the counter 138 are added up, and when a down pulse is applied via the AND circuit 140 (Fig. 9 f), the contents of the counter 13B are added. Contents are subtracted.

Of course, if the range select position 100a is changed from neutral position N to position D and position 2 to range select position 1, flip-flops 111 and 13
3 are both set, so the preset data "0001//" is read by the load pulse on line 137 (FIG. 9b).

In the case of upshifting, it is sufficient to increment the contents of the automatic shift counter 138 by an upshift pulse applied from the upshifting comparator 921 through the AND circuit 94 and the line 94a, but it is sufficient to increment the contents of the automatic shift counter 138. There is also a good speed range upper limit.

For this reason, an AND circuit 139 for automatic upshifting is provided at the up input of the automatic shift counter 138 to input a necessary up pulse to the up input of the automatic shift counter 138.

An example of the output of the AND circuit 139 is shown in FIG.

As described above, the signal on the line 131 is ゝ 1 〃 unless the range select upper limit set by the range select lever 100a is reached.

For example, as is clear from Table 4, if the lever 100a is in position 1, the line 13 is
1 signal becomes 10〃, and if the lever 100a is in position 2, line 131 becomes ゝO〃 in 4th forward speed, and if lever 100a is in position, line 131 becomes ゝO〃 in 6th forward speed.
1 becomes 10.

Thus, the signal on line 131 is related to the range select upper limit, and this signal is applied to AND circuit 139.

Further, a signal from the upshift disable time setting circuit 152 is applied to the AND circuit 139 so that the upshift manual pulse is not input continuously during the transient state in which the transmission 21 is automatically shifting.

The upshift prohibition time setting circuit 152 is a type of timer circuit, and when a gear change detection pulse is applied via the OR circuit 149, it generates a signal 0 of the time Tx and prohibits the operation of the AND circuit 139.

Note that the hold signal H8 becomes signal XXO〃 by manual operation when holding the automatic shift, and becomes signal XXO〃 when not holding.

When the hold signal H8 is set to 10, the count up or down of the counter 138 is interrupted and the count value at that time is held.

In the case of a downshift, the content of the automatic shift counter 138 is decremented by a downshift pulse applied from the downshift comparator 922 via the AND circuit 95 and line 95a, but in order to create conditions suitable for downshifting. AND circuits 145, 146, OR circuit 1
47, an automatic downshift gate circuit composed of an AND circuit 140 is provided.

This automatic shift Daum gate circuit provides one example of input/output.
Shown in Figure 1.

The AND circuit 145 is a circuit related to 1 forced downshift, and in particular, one example of input/output is shown in FIG. 11a.

For example, when the lever 100a is set to drive range D and the vehicle is traveling in 6th forward speed, if the lever 100a is switched from position to position 2, the speed changes from 6th forward speed to 5th forward speed to 4th forward speed. It is necessary to force downshifts sequentially.

In this case, as described above, the signal on the output line 132 of the comparator 126 becomes 11, and the manual hold signal H8
If (S 1 //), the AND circuit 145 becomes operable.

However, if the rotational speed detected by the speed sensor 20 is high, a sudden downshift will cause the engine 10 to overspeed, so it is necessary to prevent this from happening.

Therefore, the AND circuit 14 is connected from the shift down inhibit comparator 923 to the AND circuit 96 and the line 96a.
A down inhibit signal is added to 5.

The detected rotation speed is down inhibit line 933 (7th
), the signal on line 96a is
and holds the current speed gear.

However, when the rotation speed becomes lower than the set rotation speed of the down inhibit line 933, a pulse of signal 21 is generated on the line 96a, and a down pulse is output from the AND circuit 145.
A forced downshift is immediately performed.

When performing a normal downshift, the signal on line 132 is 0 and the output of inverter 143 is 11.

At this time, if the manual hold signal H8 is "l", the AND circuit 146 becomes operational, and the circuit 146 generates a pulse at the timing of the downshift pulse applied to the AND circuit 146 from the line 95a (FIGS. 11a and 11b). reference).

The outputs of AND circuits 145 and 146 are input to AND circuit 140 via OR circuit 141.

This AND circuit 140 includes a shift disabled time setting circuit 15.
1, a downshift lower limit signal from the NAND circuit 124, and a decoder 153 corresponding to the first forward speed.
A signal obtained by inverting the signal on the output line 154 of the output line 154 at the impark 154a is also added.

The non-shift time setting circuit 151 is a timer-like circuit having an operating time of time Ty, and outputs a signal 10 having a width of time Ty during gear shifting to secure the operating time for one downshift.

As described above, the NAND circuit 124 is a circuit for limiting downshifting in accordance with the selected "shift mode".

The output of the inverter 154a becomes 10, which indicates that the current speed stage is the first forward speed, disabling the AND circuit 140 and preventing the contents of the counter 138 from being decremented any further.

Therefore, even in the case of the "first forward speed start shift mode", the lower limit of the downshift is the first forward speed.

The input/output relationships of the AND circuit 140 when the conditions of the NAND circuit 124 and the inverter 154a are satisfied are shown in FIGS. 11a, b, and c.

Since the output of the automatic shift counter 138 is expressed in binary numbers, a decoder 153 is provided to convert it into a decimal number corresponding to each speed stage.

The decoder 153 outputs the output lines 121 to 121 of the counter 138.
The 130 binary signals are decoded onto six output lines 154 to 159 corresponding to 1st forward speed to 6th forward speed, respectively.

For example, the reader 153 may be a solid state computer.
Scientific (5olid 5tate 5c
A type 5CL4028A integrated circuit manufactured by cientific Inc. can be used.

Table 5 shows the relationship between the binary input and the decimal output of the decoder 153.

Table 5 shows the figure numbers of the lines where 11〃 occurs in the output.

By increasing the number of output lines of the decoder 153, it can be applied to automatic transmissions with 8 forward speeds or IO speeds; however, Table 5 also shows the relationship in the case of 8 forward speeds. 168°169 is the 14th
As shown in the figure.

The automatic shift detection pulse generation circuit 148 is, for example, a circuit such as a differentiating circuit, and inputs the signal of the lowest digit (line 127) of the automatic shift counter 138, detects a change in the value, and converts it from 1 to O or from 0 to When it changes to 1, a gear shift detection pulse is output.

The manual shift detection pulse generation circuit 150 inputs the output of the differential pulse generation circuit 109 and inputs the output of the differential pulse generation circuit 109 to the range selection sensor 100.
Outputs a gear shift detection pulse when the switch is switched.

The outputs of both circuits 148 and 150 are applied via an OR circuit 149 to non-shift time setting circuits 151 and 152, respectively.

Unable to shift time Ty, Tx (see Figures 10 and 11)
The time required for one downshift operation and one upshift operation of the transmission 21 is taken into consideration.

The OR circuit group 160 is a circuit for distributing the signals of each speed stage represented by the output of the decoder 153 to the solenoids S1 to SD corresponding to each speed stage as shown in Table 21 above.

According to the above “Table 2”, “@Advanced 1st speed” is the solenoid S1.
is realized when SL is energized, so the signal on the decoder output line 154 corresponding to the first forward speed is applied to the OR circuit 16.
1 and 164.

As illustrated, the OR circuit 161, the AND circuit 172, and the amplifier 182 correspond to the solenoid S1, and the OR circuit 16
2, AND circuit 173 and amplifier 183 correspond to solenoid S2, OR circuit 163, AND circuit 1γ4, and amplifier 184 correspond to solenoid S3, and OR circuit 1
64, AND circuit 1γ5, and amplifier 185 correspond to solenoid SL.

In addition, [For forward 2nd speed J, solenoid 81 is energized, so the signal on line 155 is sent to the OR circuit 161, "For 3rd forward speed J, solenoid S2.SL is energized, so the signal on line 156 is sent to OR circuits 162 and 164, "Forward 4th speed ” is solenoid 8
2 is energized, so the signal on line 157 goes to OR circuit 162,
"Forward 5th speed" is solenoid S3゜SLA! Therefore, the signal on line 158 is sent to OR circuits 163 and 164 as "forward 6".
Since the solenoid 83 is energized at "speed", the signal on the line 159 is applied to the OR circuit 163, respectively.

The output of each OR circuit 161-164 is AND circuit 112-
115, and the output line 9 of the flip-flop 99 for torque converter cock-up is connected to the AND circuit 171.
9a is added, and the reverse position R detection line 10 of the range select sensor 100 is applied to the AND circuit 116.
5 signals are added.

The output of the neutral interlock circuit 179 is added to the other inputs of each AND circuit 111-176, and this signal is normally (% l //).

Outputs of OR circuits 161 to 164 and flip-flop 9
Signals SS 1 outputted from corresponding AND circuits 111 to 176 in accordance with the output of 9 and the reverse position detection signal of line 105 are applied to solenoid drive amplifiers 181 to 186, and these amplifiers 181 to 18
By the output of 6, the corresponding solenoid SD, SL, 8
2.83. energize SL and SR.

When a key switch (not shown) for starting the engine 10 is turned on, the neutral interlock circuit 179 ensures that the range select lever 100a is not outputted unless the range select lever 100a is set to the neutral position N. This is a circuit designed to do this.

For example, a memory circuit (not shown) is set so that the output line 170 becomes "O" when the engine start key switch is turned on, and the range select sensor 100
The circuit configuration is such that when a detection signal of the neutral position N is generated on the neutral position detection line 104 from the above, the memory circuit is reset and the output line 170 is set to 11.

Further, the neutral interlock circuit 119 can be used not only when starting the engine, but also when the engine is overloaded or when the lever 100a is set at the parking position P.

That is, range select sensor 1 is connected via line 106.
When a detection signal from 00 to parking position P is input, the neutral interlock circuit 179 is set so that the output line 170 becomes 10.

Then, when the lever 100a is set to the neutral position N, the circuit 179 is reset by the neutral position detection signal from the line 104 so that the output line 170 is set to ISS 1 //.

By inserting an OR circuit into the line 106 and inputting an engine overload detection signal and an engine start detection signal in addition to the parking position detection signal, when the range select lever 100a moves from the parking position P to another range, , or when the engine is overloaded or when the engine is started, the AND circuits 171 to 176 are not activated unless the lever 100a is set to the neutral position N.
It is possible to prevent the solenoid selection signal from being output.

In short, neutral interlock circuit 179 includes a memory circuit such as a flip-flop.

Each solenoid Sl, 82, 83. SL, SR.

As mentioned above, the SD is incorporated in the selector valve groups 52 and 81 in the fluid circuit shown in FIG. 2, and pilot-operates the shift valve groups 51, 65, and 71.
Each clutch cylinder 1C12C, 3C, RC, DC, L
, H (this 7 is used).

Solenoid S1~SD and crank cylinder IC-
The relationship between the DC operating state and the speed stage is as shown in Table 2 above.

Thus, in the six forward speed automatic transmission explained in the above embodiment, the speed corresponding to each range select position (T, that is, the drive range position D of the range select lever 100a, the second range select position 2, and the lunge select position 1) The stages are set by the diode matrix 114 to be six forward speeds, four forward speeds, and one forward speed, respectively.

Therefore, the speed stage (F6°F) corresponding to the range select stage (D, 2 or 1) selected via the lever 100a.
4 or Fl) with an upper limit.

Of course, by appropriately changing the way the diode matrix 114 is assembled, the gear position corresponding to each range select position can be changed.

The "shift modes" that can be realized in the six-speed forward automatic transmission described in the above embodiment can be roughly divided into the following two types (in the case of range select gear) (1) From 1st forward speed to 6th forward speed. Shift mode that automatically shifts gears within the range of (
(if lever 100a passes through position 1).

(2) Shift mode in which automatic gear changes are performed in the range from 2nd forward speed to 6th forward speed (when lever 100a does not pass through position 1).

By operating the range select lever 100a to select the upper limit range, the following three modes are obtained as variations of the above items (1) and (2).

(3) Automatic shifting in the range from 1st forward speed to 4th forward speed (in the case of range select stage 1).

(4) Automatic shifting in the range from 2nd forward speed to 4th forward speed (in the case of range select stage 2).

(5) Forward l speed only (for range select stage 1)
.

Next, an embodiment in which the present invention is applied to an automatic transmission with eight forward speeds and one reverse speed will be explained with reference to FIGS. 12 to 14.

In FIGS. 12 to 14, parts given the same reference numerals as those in FIGS. 1 to 3 are parts to which the same configuration can be adopted.

FIG. 12 is a diagrammatic abstraction of a power transmission device having a gear transmission 500 with eight forward speeds and one reverse speed.

This transmission device is provided with planetary gear groups 501 and 502 in place of the planetary gear group 21 in FIG.

The planetary gear group 501 is the torque converter output shaft 1
Sun gear human power 503 connected to 3 and carrier output 5
04, and a ring gear 506 that is fixed by a low-speed clutch 505 that is engaged by the operation of a low-speed clutch cylinder L'.

The planetary gear group 502 is a high-speed clutch cylinder "
an input ring gear 508 connected to the carrier 504 of the planetary gear group 501 via a high-speed clutch 501 that is engaged by the operation of the output carrier 50;
9, and a sun gear 511 that is fixed via a medium speed clutch 501 that is engaged by the operation of a medium speed clutch cylinder M.

The path from the planetary gear group 35°36.3γ to the output shaft 12 is the same as in FIG.

Each speed stage of 8 forward speeds and 1 reverse speed is the combination of clutch cylinders 1C to 3C, L', H', M, RC shown in Table 6 below.
, each clutch 41 to 50, 505, 507,
Obtained by selecting 510 Engage.

As described above, the direct coupling single clutch 16 is engaged by the operation of the clutch cylinder DC when the set rotational speed is reached.

FIG. 13 shows each clutch cylinder 1C to 3C.

A fluid pressure circuit for operating RC, DC, L', H', and M is shown.

The difference between this fluid pressure circuit and the fluid pressure circuit shown in FIG. 2 is that instead of the H/L clutch shift valve T1 and selector valve 81 in FIG.
It is provided with a shift valve 512 and a selector valve 513 for operating the high-speed clutch cylinder H' and a shift valve 514 and a selector valve 515 for selectively operating the high-speed clutch cylinder H' and the medium-speed clutch cylinder M. , otherwise the circuit is the same as in FIG.

Selector valves 513 and 515 are solenoids SL' and S
H' respectively.

As before, solenoid Sl, 82, 83. S.R.S.
When D is energized, clutch cylinders IC, 2C, 3C2
SC and DC are activated respectively.

The relationship between each speed stage and the energization of the solenoid is as shown in Figure 7 on the next page.

Each solenoid S1-83, SR, SL', SH'
.

A signal for automatically controlling the energization and de-energization of the SD is given from the electronic controller 200'.

The electronic control section 200' can have substantially the same configuration as that in FIG. 3 by simply changing the configuration of a part of the electronic control section 200 in FIG.

FIG. 14 shows a part of the electronic control unit 200', that is, a part where the configuration of the electronic control unit 200 has been changed, and the other configurations not shown are the same as the corresponding parts in FIGS. 3a and 3b. .

Each range select stage of the range select lever 100a (
Position 1, 2. Range select finger corresponding to D)>IR
, 2R, and 3R set the upper limit of automatic transmission speed to 1st forward speed (Fl), 5th forward speed (F5), and 8th forward speed (F8), respectively.
), the diode matrix 114' of the range select circuit 113 is configured as shown in Table 8 below.
The operations of the comparator 126 and the automatic shift counter 138 are the same as in the case of FIG. 3.

Of course, preset data is added to the counter 138 via lines 141 and 142, so that it is possible to select either a "1st forward speed start" or "2nd forward speed start" shift mode. .

Therefore, the possible shift modes are (1) a range of 1st forward speed to 8th forward speed, (2) a range of 2nd forward speed to 8th forward speed, and these (1)
Further, as variations of items 2 and 2, there are (3) a range of 1st forward speed to 5th forward speed, (4) a range of 2nd forward speed to 5th forward speed, and (5) a mode of only 1st forward speed.

The above item (1) is realized when the range select lever 100a is operated from the neutral position N to the drive range position via the lunge select position 1.

Item (2) above refers to lever operation from position N to position, and (3) above.
) is the lever operation from position N → position 1 → position 2, and the above (4)
Item ) is realized by operating the lever from position N to position 2, and item (5) above is realized by operating the lever from position N to position 1.

That is, this is because each range select stage (position, 2.1) is set in the diode matrix 114'' to correspond to the eight forward speeds, the fifth forward speed, and the first forward speed, respectively.

The output of the automatic shift counter 138 is decoded by the decoder 153', but since there are eight forward stages, the output of the automatic shift counter 138 is decimal 1 to 1.
In addition to output lines 154-159 corresponding to 6, 10
Output lines 168 and 169 corresponding to base numbers 7 and 8 are provided, as shown in Table 5.

The OR circuit group 160' includes five OR circuits 161' to 16.
5' are provided, and necessary lines 154 to 83° are provided to energize each solenoid 81 to 83° SL', SH', SR, and SD according to the combinations in Table 7 according to the output of the decoder 153'. Signals 159, 168, and 169 are input.

The OR circuit 161' is the decimal output 1 of the decoder 153',
3.4 (lines 154, 156, 157) and drives the solenoid S1.

The OR circuit 162' is the decimal output 2 of the decoder 155',
This is a circuit 2 for driving the solenoid S2 in response to signals of 5°6 (lines 155, 158, 159).

The OR circuit 163' is the decimal cuff of the decoder 153'.
8 (Solenoid S after receiving signals on lines 168 and 169
This is a circuit for driving 3.

The OR circuit 164' receives the decimal output 1°2 (lines 154, 155) of the decoder 153' and the detection signal of the range select position R from the line 105, and outputs the solenoid SL.
This is a circuit for driving '.

The OR circuit 165' is the io output power of the decoder 153', 4
This is a circuit for driving the solenoid SH' in response to signals on lines 157, 159, and 169.

Tsuremade SR is energized when the linear range selection position R detection signal from line 105 is applied to land circuit 177'.

Solenoid SD is energized when the dolphin knob up signal from line 99a is applied to AND circuit 171'.

The AND circuits 111' to 111' are connected to the line 1 as described above.
10 signals enable operation.

Amplifiers 181' to 181' are Tsure/Ide SD, Sl to S
This is for driving 3 degrees SL', SH', and SR.

An embodiment of the present invention has been described above in the case of a 6-speed forward transmission and an 8-speed forward transmission. However, regardless of the number of speeds, the electro-hydraulic automatic transmission control device according to the present invention can be applied in accordance with the above embodiment. It is clear that it is possible to construct

That is, it is only necessary to change the way the diode matrix 114 is assembled, and the automatic shift counter 138,
Binary 4 as decoder 153 and comparator 126, respectively.
If a bit type is used, the diode matrix 114
It can be applied to multi-speed transmissions with up to 15 speeds by simply changing the assembly method.

Note that a bidirectional shift register or the like may be used as the automatic shift counter 138, and in this case, up (increase) or down (decrease) corresponds to a right shift or a left shift.

As explained above, according to the present invention, the selection of the range select maximum speed stage corresponding to each range select stage can be arbitrarily set or changed by simply assembling the diode matrix, so that it is possible to arbitrarily set or change the selection of the range select maximum speed stage corresponding to each range select stage. This makes it easy to select and change intermediate range select stages (for example, positions 2 and 1 of lever 100a).

Therefore, it exhibits excellent effects as an automatic transmission control device for construction vehicles and the like using a multi-gear transmission.

In addition, by changing the way the diode matrix is assembled, it can be applied to multi-speed transmissions with different numbers of gears, so standardization of the main circuit parts of automatic transmission control devices,
It can promote generalization and is economical.

[Brief explanation of drawings]

FIG. 1 is a schematic structural explanatory diagram showing one embodiment of the present invention applied to an automatic transmission with six forward speeds and one reverse speed. FIG. 2 schematically shows the electrical relationship with the electronic control section. FIG. FIG. 3 is a detailed block diagram showing an example of the electronic control unit in the same embodiment, and is a circuit diagram showing a fluid pressure circuit including valves and cylinders that control the above-mentioned transmission device in response to energization. Figure a. Fig. 4 is a block diagram showing an example of the speed sensor shown in Fig. 1, Fig. 5 is a graph showing an example of the speed sensor output pulse shown in Fig. An explanatory diagram showing an example of the throttle sensor shown in Fig. 1,
Fig. 7 is a graph showing an example of a shift pattern (shift area) consisting of the correlation between throttle opening and torque converter output shaft rotation speed, and Fig. 8 is an explanation showing an example of the range select sensor shown in Fig. 1. Figure 9 is a timing chart showing an example of the input/output signals of the automatic shift counter shown in Figure 3, and Figure 10 is a logic gate circuit that provides an up pulse input to the automatic shift counter shown in Figure 3. FIG. 11 is a timing chart showing an example of the operation of the logic gate circuit section that provides a down pulse input to the automatic shift counter.
Figure 2 is a schematic structural explanatory diagram showing another embodiment of the present invention applied to an automatic transmission with eight forward speeds and one reverse speed. Fig. 13 schematically shows the electrical relationship with the control section.
FIG. 14 is a fluid pressure circuit diagram showing an example of a fluid pressure circuit related to the embodiment shown in the figure. FIG. 14 is a block diagram showing an example of the electronic control section shown in FIG. 12 only with respect to parts different from FIG. 3. 1... 1st runge selection position, 2...
2nd range select position, D... Drive range position, N... Neutral position, R...
...Reverse range position, P... Parking position, IC, 2C, 3C. RC, DC, L, H, L', H', M...
・Clutch cylinder, Sl, S2. S3. S.D., S.L.
, SL'. SH', SR... Solenoid, 10...
・Engine, 15...Torque converter, 16
...Torque converter connection clutch, 20...
...Speed sensor, 21...Multi-stage gear transmission, 27,35,36°3γ...Planetary gear group, 31,33,47°48.49.50...
...Clutch, 51...Shift Harz group, 52
...Selector balloon in, 90...Throttle sensor, 100a...Range select lever, 100...Range select sensor, 2
00.200'...Electronic control section, 91...
... Throttle position detection circuit, 92 ... Rotation speed comparison circuit, 101 ... Range selection detection circuit, 113 ... Range selection circuit, 126
-...-Comparator, 138... Automatic shift counter.

Claims (1)

[Claims] 1. It has a counting circuit to which an increment pulse or a decrement pulse generated in response to the vehicle running condition is supplied, and controls the increase/decrease operation of the counting circuit in accordance with the operation position of the range select lever, and controls the counting circuit. In an automatic transmission control device that selects a speed gear corresponding to the contents of a circuit, a signal generated corresponding to an operating position of the range select lever is used to select the highest speed gear corresponding to the operating position of the range select lever. A code conversion circuit that converts the code conversion circuit into a binary signal shown in FIG. outputs a signal to enable an increment operation, and when the output value of the code conversion circuit is smaller than the content of the counting circuit, outputs a signal to force the counting circuit to perform a subtraction operation. an automatic transmission control device, comprising: a comparator for controlling the range select lever, and wherein an upper limit speed stage corresponding to each operation position of the range select lever can be appropriately set in the code conversion circuit.