JPS6239330A - Shift-up indicating method for manual transmission gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD The present invention relates to an upshift instruction method for instructing a manual transmission of a vehicle to be in an operating state in which an upshift is required.

BACKGROUND ART Conventionally, in a shift-up instruction device for a vehicle having a multi-speed manual transmission, the current vehicle speed and the gear ratio of the manual transmission are detected, and the detected vehicle speed is set corresponding to the detected gear A7 ratio. When the vehicle speed exceeds the determined reference vehicle speed, the driver is notified by lighting a lamp or the like that the driver should shift up.

In the case of a manual transmission with a gear ratio of 3rd gear or higher, the conventional shift-up instruction device does not automatically shift from a low-speed ratio to a medium-speed ratio, regardless of whether or not the shift-up is caused by sudden acceleration. Since the vehicle speed for determining the high-speed ratio is uniquely set depending on driving conditions, an upshift instruction may not be issued even when an upshift would be expected to improve fuel efficiency.

Therefore, it is determined whether or not an upshift from a low speed ratio to a medium speed ratio is performed under sudden acceleration.If the upshift is not performed under sudden acceleration, the standard value for determining an upshift from a medium speed ratio to a high speed ratio is determined based on the vehicle speed. The present applicant has proposed a shift-up instruction method in Japanese Patent Application No. 59-203275, which aims to improve fuel efficiency by setting the fuel consumption lower than when shifting up during sudden acceleration.

By the way, in a manual transmission with five forward gears, after the gear is shifted up with sudden acceleration in third gear, the vehicle is driven at a constant speed slightly lower than the reference vehicle speed for determining the vehicle speed used to issue an instruction to shift up to fifth gear. There are cases. In this case, even if you shift up, the drivability is relatively good, so the fourth
If you continue to drive at a constant speed as described above, you will not be able to expect any improvement in fuel efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to generate an appropriate shift-up instruction even when driving at a constant speed is continued at a medium-speed ratio, even if the gear-up is caused by sudden acceleration from a low-speed ratio to a medium-speed ratio. An object of the present invention is to provide a shift-up instruction method capable of improving fuel efficiency.

The shift up instruction method of the present invention determines whether the gear ratio of the manual transmission is shifted up from a low speed ratio to a medium speed ratio due to sudden acceleration. The vehicle speed discrimination reference value for upshifting is set lower than when the upshift occurs due to sudden acceleration, and when it is determined that the upshift from a low speed ratio to a medium speed ratio occurs due to sudden acceleration, the vehicle speed is driven at a constant speed after sudden acceleration in the medium speed ratio. It is characterized in that it is determined whether or not (cruise driving) has continued for a predetermined time or more, and when it is determined that constant speed driving has continued for a predetermined time or more, a shift-up determination reference value at a medium speed ratio is set low.

Example Embodiments of the present invention will be described below with reference to the drawings.

In the shift-up instruction device for a five-speed transmission to which the shift-up instruction method according to the present invention shown in FIG. 1 is applied,
A control circuit 1 consisting of a microcomputer is provided,
A pressure sensor 2, a water temperature sensor 3, a vehicle speed sensor 4, and a crank angle sensor 5 are connected to the control circuit 1. The pressure sensor 2 generates an output voltage at a level corresponding to the pressure in the intake manifold downstream of the throttle valve of an internal combustion engine (not shown) mounted on the vehicle, and the water temperature sensor 3 generates an output voltage at a level corresponding to the engine cooling water temperature. Generates an output voltage of level □. The vehicle speed sensor 4 generates an angular position signal with a period inversely proportional to the rotational speed of the output shaft of the manual transmission. Further, the crank angle sensor 5 generates an angular position signal with a period inversely proportional to the rotational speed of the engine crankshaft. Also connected to the control circuit 1 is a lamp 6 for instructing upshifting.

The control circuit 1 includes a level correction circuit 11.12 that corrects the output level of the pressure sensor 2 and water temperature sensor 3, a multiplexer 13 that selectively outputs the output signal of either one of the level correction circuits 11.12, and Multiplexer 13
An A/D converter 14 that converts analog signals output from the vehicle speed sensor 4 and the crank angle sensor 5 into digital signals, and waveform shaping circuits 15 and 16 that shape the angular position signals output from the vehicle speed sensor 4 and the crank angle sensor 5 into pulse signals, respectively. , waveform shaping circuit 1
A digital signal (
l! V counter 1 that generates a value that is inversely proportional to the speed
7, and an Ne counter 18 which measures the generation interval of the output pulses of the waveform shaping circuit 16 by counting predetermined clock pulses and generates a digital signal representing the engine speed (having a value inversely proportional to the engine speed). , one drive circuit for driving the lamp 6, a CPU (central processing unit) 20, a ROM 21 in which various programs and data are stored, and a RAM 22. A
/D converter 14, counter 17°18, drive circuit 19,
CPU20. ROM21 and RAM22 are input/output bus 2
Connected by 3.

Note that the CPU 20 has a plurality of timers T+so.

T+ s o', TONE, T 2nd, and TCL
It has a built-in down counter that starts counting down when the timer wall is set.

In J3 having such a configuration, the information on the pressure Ps in the intake manifold and the cooling water temperature Tw is alternatively transmitted from the A/D converter 14, the information on the vehicle speed ■ is transmitted from the V counter 17, and the information on the engine rotation speed is transmitted from the Ne counter 18. N+3 information is CPLJ
20 via an input/output bus 23, respectively. CPU
20 reads each of the above-mentioned information according to the calculation program stored in the ROM 21, and based on the information, determines by the method of the present invention whether or not the operating state is such that it should be shifted up, and determines that it should be shifted up. When this happens, a lamp lighting command is output to one drive circuit.

Next, the procedure of the shift-up instruction method according to the present invention executed by the control circuit 1 will be explained with reference to the operational flow diagram of FIG.

In this procedure, first, the pressure Pe, the cooling water temperature Tw,
Vehicle speed ■ and engine speed Ne are each read and stored in RAM.
22 (step 51).

Next, it is determined whether the read pressure P8 is equal to or higher than a predetermined pressure P+ (for example, -150 mmt-to) (step 52), and if the negative pressure PB is equal to or lower than the predetermined pressure P1, that is, a value on the negative pressure side. , the first timer T+so'
A predetermined value is set (step 53). The first predetermined value is a value corresponding to the predetermined time ta (for example, 2°5 seconds). If Ps>P+1, that is, the value on the atmospheric pressure side, the count value T+so' of timer T+so' is O at the time of sudden acceleration.
, that is, whether the state of Ps>P+ has continued for a predetermined time [a (step 54). If T+s o '=0, it is determined whether flag A is equal to 1 (step 55).
. When flag 8 is 1, it indicates that sudden acceleration was performed in the third gear ratio of the transmission. If A≠1, it is determined whether the transmission is currently in third gear (step 56), and if it is in third gear, flag A is set equal to 1 (step 57), and the transmission is in third gear. If not, flag A is made equal to O (step 58). On the other hand, if it is determined in step 53 that the timer T+so' is hit or that T+so'≠O in step 54, it is determined whether flag A is equal to 1 (5 steps). If it is determined that A=1 in steps 55 and 59, or the flag A is determined in steps 57 and 58.
After the gear ratio is set, the gear ratio of the transmission changes to 3rd and 4th gear.
It is determined whether a flag FONE indicating that either the speed or the fifth speed has been established at least once is set to 1 (step 60). If FONE≠1 as a result of the previous execution of this routine, it is determined whether the gear ratio for shifting is in the third speed (step 61). If it is not the third gear, it is determined whether the gear ratio of the transmission is in the fourth gear (step 62), and if it is not the fourth gear, it is further determined whether the gear ratio of the transmission is in the fifth gear. (
Step 63). If it is not 5th gear, 1st gear, 2nd gear
timer TONE is in the fast or neutral state, and the timer TONE is set to a second value corresponding to a predetermined time tb (for example, 1.5 sec).
A predetermined value is set (step 64), and the flag F
ONE is set to 0 (step 65). On the other hand, if it is determined in steps 6 to 63 that the gear ratio of the transmission is 3rd, 4th, or 5th, it is determined whether the count value TONE of the timer TONE is equal to O or not. It is determined whether the state of 3rd speed, 4th speed, or 5th speed has continued for a predetermined time tb (step 66). If TONE f=o, the state is 1st speed, 2nd speed, or neutral state. Similarly, in step 65, 7
O is set in the lag FONE.

Then, a predetermined time tc (for example, 2
A third predetermined value corresponding to 5 sec) is let (step 67), and the vehicle speed V is set to a predetermined speed V+ (for example, 6M
1le/h) or less is determined (step 68). Meanwhile, in step 66, TONE=
If it is O, the flag FONE is set to 1 (step 69), and it is determined whether the gear ratio of the transmission is the second speed (step 70). This determination is also made when it is determined that FONE=1 at step J3 in step 60, that is, when it has already been determined that the gear is in the third, fourth, or fifth speed during the previous execution of this routine. If it is not the second speed, step 67 is executed; if it is the second speed,
It is determined whether the count value T2nd of the timer T2nd is equal to O, that is, it is determined whether a predetermined period of time [C has elapsed since the shift down to the second speed (step 71). If T2nd=Q, step 68 is executed. If it is determined in this step 68 that ■≦v1, if it is determined that T2nd=O in step 71, or if A≠1 is determined in step 59, flag A and flag FONE are set to 0. (Step 72).

After performing step 72 or in step 68, V
>V+, it is determined whether the gear ratio of the transmission is one of the first to fourth speeds (step 73). In the case of 1st speed to 4th speed, the difference Δ■ obtained by subtracting the previous value from the current value of vehicle speed V is the predetermined value V2
(for example, 0.5M1le/h) (step 74), and if ΔV≧V2, the vehicle is accelerating, and whether the pressure Pa is greater than or equal to the predetermined pressure 91. A determination is made (step 75).

If Pa > P+, it is a sudden acceleration, and timer T+so
A fourth predetermined value corresponding to the predetermined time td is set (step 76), and it is determined whether a flag FT75 representing the level of the cooling water temperature Tw is equal to 1 (step 77). The flag F75 is set to O when the cooling water mTw is at a predetermined temperature (for example, 75°C) or higher;
It is set to 1 when the temperature is below a predetermined temperature.

If FT75=O, it is considered to be a sudden acceleration in HOT mode, and the determination reference vehicle speed in 1st to 4th gear is Vo+ or V.
Data value Vo++ in O4.

VO2+, VO3+, VO4+ are set sequentially.
'L (step 78). If FT75=1, C0LD
The standard vehicle speed Vo+, which is considered to be a sudden acceleration mode, is V.
Data value VO13, VO23° VO33,043 in O4
are set sequentially (step 79). On the other hand, in step 75, if Pa≦P1, it is the time of gentle acceleration, and it is determined whether the count value T+so of the timer T150 is equal to O, that is, the gentle acceleration state is maintained for a predetermined time t.
It is determined whether the process has continued for d or more (step 8).
0). If T150≠O, there is a possibility of sudden acceleration, so step 77 is executed. If T+5O=O, it is determined whether flag FT75 is equal to 1 (step 81). If Frys=0, it is assumed to be a slow acceleration in HOT mode, and the data value V is set to the discrimination reference vehicle speed Vo+ or VO4.
OI2゜VO221VO32, VO42 are set sequentially (step 82), and if FT7 s-1, C0LD
Standard vehicle speed Vo+ or VO for determining mode's slow acceleration
4, the data value VOI4. VO24゜VO34, VO44
are set sequentially (step 83).

If it is determined in step 74 that ΔV<V2, it is determined whether the absolute value 1Δ■1 of the difference Δ■ is smaller than v2 (step 84).

(If Δ■1≦v2, the vehicle is in cruise mode, and it is determined whether the pressure Pa is equal to or higher than the predetermined pressure 91 (step 85). If PB>P+, there is a possibility that the vehicle will accelerate from now on. A fourth predetermined value is set to the timer T+so (step 86), and then, as in the case of slow acceleration, it is determined in step 81 whether FT75 is equal to 1.In step 85, if Pa≦P1. In this case, it is determined whether the count value T150 of the timer T+so is equal to O, that is, the cruise state has been maintained for a predetermined time t.
It is determined whether the process has continued for d or more (step 8).
7). If T+so≠0, step 81 is executed considering the possibility of acceleration, and if T+5o=O, the flag FT is
It is determined whether 75 is equal to 1 (step 88).
.

When FT75=1, it is assumed to be cruise in GOLD mode and the data value Vo+ is set to the discrimination reference vehicle speed Vo+ or VO4.
s, Vo2s, Vo3s, and Vo4s are set in sequence (step 89). If FT75=0, H'O
The vehicle is set to cruise in T mode, and the data values Vo+s, VO25, and VO35 are sequentially set to the discrimination reference vehicle speed Vo+ to VO3 (step 90). Then, it is determined whether flag A is equal to 1 (step 91).
.

If A=O, there is no rapid acceleration in 3rd gear, so 4th gear
The data value Vo4s is set to the vehicle speed determination reference vehicle speed VO4 (step 92), and if A=1, the vehicle was in a rapid acceleration state in the third gear, so the data value Vo4s is set to the determination reference vehicle speed VO4 in the fourth gear. Data value VO47 is set (step 93).

In this way, the determination reference vehicle speed Vo+ of the first to fourth speeds is determined.
Once VO4 is determined, it is determined whether the gear ratio is in 1st gear (step 94), and if it is in 1st gear,
It is determined whether the vehicle speed V is greater than the first speed determination reference vehicle speed Vo+ (step 95). If V>VOI,
Assuming that the vehicle is in an operating state in which it should shift up to second speed, a lamp lighting command is generated and the lamp 6 is turned on by one drive circuit (step 96). If V≦Vo+, the second
The lighting of the lamp 6 is stopped since the operating state in which the vehicle should be shifted up quickly has not been reached (step 97). If it is determined in step 94 that gear register A is not in first gear, it is determined whether gear register A is in second gear (step 98
), if the vehicle is in 2nd gear, the vehicle speed V is the 2nd gear determination reference vehicle speed VO.
It is determined whether the value is greater than 2 (step 99). V>V
o If 2, the lamp 6 is turned on in step 96, indicating that the vehicle is in a driving state where it should be shifted up to third gear.
If V≦Voz, it is determined that the operating state for shifting up to third speed has not been reached, and the lighting of the lamp 6 is stopped in step 97. Similarly to the above, if it is determined in step 98 that the gear is not in second gear, it is determined whether or not the gear A7 ratio for shifting is in third gear (step 100).
, if the vehicle is in 3rd gear, the vehicle speed V is the 3rd gear determination reference vehicle speed VO.
It is determined whether or not it is greater than 3 (step 101).
.

If V>VO3, the lamp 6 is turned on in step 96, indicating that the vehicle is in an operating state in which it should be shifted up to fourth gear. If ≦VO3, the lamp 6 is stopped from lighting as it is assumed that the driving state has not reached the state where the gear should be shifted up to the fourth gear. If it is determined in step 100 that the vehicle is not in the third speed, it is determined whether the vehicle speed ■ is greater than the fourth speed determination reference vehicle speed Vo4 (step 102). If Vo>Voa, timer TCL is set for a predetermined time Te (for example, 5s
ec) is set (step 1).
03), the lamp 6 is turned on in step 95, indicating that the vehicle is in an operating state in which it should be shifted up to fifth gear. Vo
If VO4, it is determined whether the gear ratio is in the fourth speed (step 104). If it is not the fourth speed, a fifth predetermined value is set in the timer TCL (step 105).
), the lighting of the lamp 6 is stopped in step 97. If it is the fourth speed, it is determined whether the flag A for determining sudden acceleration in the third speed is equal to 1 (step 106).
. If A≠1, step 105 is executed, and if Δ=1, the shift-up was carried out from 3rd gear to 4th gear with sudden acceleration, so the absolute difference Δ■, which is the difference between the current value and the previous value of vehicle speed V, is calculated. It is determined whether the value is smaller than a predetermined value (2) (step 107).

If 1ΔVl>V2, it is during acceleration, so step 10
5 is executed. If 1Δv1≦v2, it is during cruise driving, and the pressure Ps in the intake manifold is equal to the predetermined pressure P.
2 (for example, −460 mmtl) or more is determined (step 108). The predetermined pressure P2 is provided with hysteresis so that it changes according to the determination result of the previous step 108. If Pa>P2, the cruise state is not maintained and step 105 is executed; if P8≦P2, the cruise state is maintained and it is determined whether the count value TCL of the timer TCL is equal to O. (Step 109).

If TCL≠0, since the cruise driving has not continued for the predetermined time te, it is determined that the operating state in which the vehicle should be shifted up to the fifth gear has not been reached, and step 97 is executed. King C
If L = O, the cruise driving continued for a predetermined period of time equal to or greater than 0, so even if the gear is shifted up with sudden acceleration in the 3rd gear, the data value VO45 is used as the discrimination reference vehicle speed in the 4th gear, and the vehicle speed V is set as the data value Voas. It is determined whether it is greater than (step 110). ■If ≧045, the fifth
The lamp 6 is turned on in step 95 to indicate that the operating state is such that the shift-up should be performed.If V<VO45, the operating state is determined to be that the shift-up is not necessary and the lamp 6 is turned on in step 9.
7 is executed.

If it is determined in step 73 that the gear ratio of the transmission is not in 1st or 4th gear, it is in 5th gear or neutral, and it cannot be said that an upshift is required, so the lamp 6 stops lighting. (Step 97
). Step 97 is also executed when the vehicle is in a decelerating state, which is determined in step 84 as 1ΔVl>V2.

In the shift-up instruction method according to the present invention,
The standard vehicle speed for determining upshifts for each gear ratio is, for example,
As shown in FIG. 3, it is determined by the acceleration time and cruise time in each mode.

In other words, in the case of sudden acceleration in 3rd gear in HOT mode, the reference vehicle speed for determining upshift to 4th gear is 30M1l.
e/h, and then the reference vehicle speed for determining when shifting up to 5th gear in a cruise state is 35M1le/h. On the other hand, in the case of slow acceleration in 3rd gear in HOT mode, the standard vehicle speed for determining upshifting to 4th gear is 23M
The vehicle speed then drops to 25M1le/h, and the reference vehicle speed for determining the upshift to 5th gear in the cruise state also drops to 25M1le/h.

Further, in the shift-up instruction method according to the present invention, as shown in FIG. 4, at time A1. :, j'3 is in 3rd gear and in a rapid acceleration state (Pa≦P+), and if this state continues and the gear is shifted up from 3rd gear to 4th gear at that point, then the shift is in 5th gear. VO47 is set as the reference vehicle speed Voa for determining upshift. After that, if the vehicle speed in 4th gear exceeds the discrimination reference vehicle speed V○45 when the vehicle speed is shifted up from 3rd gear other than sudden acceleration and the vehicle starts cruising, the cruising will continue and the vehicle will continue to cruise. 90 Predetermined time t from start point C
Shift-up determination standard vehicle speed after o has elapsed
It is changed to VO45, which is smaller than O47.

Therefore, at this point, the shift-up instruction lamp 6
lights up to notify the driver that the vehicle is in a driving state that requires an upshift.

In the embodiment of the present invention described above, the gear ratio of the manual transmission is determined by dividing the vehicle speed V by the engine rotation speed Ne (V/Ne > belongs to the range corresponding to each gear ratio, so the division value V/ Ne. Note that a switch may be provided for each gear ratio of the manual transmission that is turned on when the shift lever is operated to the shift position.

Furthermore, in the above-described embodiment of the present invention, a five-speed transmission is shown, and the low speed is the third speed, but the low speed may also be the second speed or the first speed. Flag A is set to 0 only when the vehicle is stopped. Furthermore, the present invention can be applied to a plurality of ratios at the same time, and in this way, it is possible to expect an improvement in fuel efficiency of -ffl.

Furthermore, in the embodiment of the present invention described above, when it is determined that cruise driving has continued for a predetermined time period te or more, the shift-up determination reference vehicle speed is set to Voas.
As long as it is lower than 47, it is not limited to this. For example, the high temperature determination reference vehicle speed may be set to be a low vehicle speed depending on the engine temperature, or may be set higher or lower than 045 depending on the margin of engine output.

Effects of the Invention As described above, in the method for instructing a shift up of a manual transmission of the present invention, a shift is made from a low speed ratio to a medium speed ratio due to sudden acceleration, and as a result, the vehicle speed is shifted from a low speed ratio to a high speed ratio at the medium speed ratio. If cruise driving continues for a predetermined time or longer without reaching the up-discrimination reference value, an up-shift instruction is issued.

Therefore, by shifting up to a high speed ratio in accordance with this upshift instruction, it is possible to improve fuel efficiency without deteriorating drivability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a shift-up instruction device to which the shift-up instruction method according to the present invention is applied, FIG. 2 is an operation flow diagram of a control circuit showing an embodiment of the present invention, and FIG. 3 is a shift-up determination reference vehicle speed. FIG. 4 is a diagram showing the operating state of the apparatus shown in FIG. 1. Description of symbols of main parts 1... Control circuit 2... Pressure sensor 3... Water temperature sensor 4... Vehicle speed sensor 5... Crank Angle sensor 6...Lamp

Claims (4)

[Claims] (1) A shift-up instruction method that issues an instruction to shift up when the vehicle speed of a vehicle equipped with a manual transmission having at least three ratios exceeds a shift-up determination reference value set for each ratio, It is determined whether the gear ratio of the manual transmission has been shifted up from a low speed ratio to a medium speed ratio due to acceleration, and when it is determined that the gear ratio has been shifted up due to a condition other than sudden acceleration, a shift up determination reference value for the medium speed ratio is set to sudden acceleration. When it is determined that the gear ratio has been shifted up from a low speed ratio to a medium speed ratio due to sudden acceleration, it is determined whether constant speed driving has been continued for a predetermined time or longer after sudden acceleration in the medium speed ratio. However, when it is determined that constant speed driving has been continued for a predetermined time or longer, a shift-up determination reference value at a medium speed ratio is set to a low value. (2) A patent claim characterized in that the shift-up determination reference value at a medium speed ratio when driving at a constant speed continues for a predetermined time or more is equal to the shift-up determination reference value when the shift-up is performed other than sudden acceleration. The method for instructing a shift up according to the first item in the range. (3) A patent claim characterized in that the result of determining that the gear ratio has been shifted up from a low speed ratio to a medium speed ratio due to sudden acceleration is stored, and the memory is erased by detecting the lowest vehicle speed or when the vehicle is almost stopped. The shift-up instruction method according to the first or second item of the range. (4) The shift-up instruction method according to any one of claims 1 to 3, characterized in that a sudden acceleration is determined when the pressure inside the intake pipe is equal to or higher than a predetermined pressure.