JPH0621647B2 - Shift control device for automatic transmission - Google Patents

Description

The present invention relates to a shift control device for an automatic transmission mounted on a vehicle such as an automobile.

[Conventional technology]

Conventionally, when performing shift control for an automatic transmission for a vehicle, a shift pattern is previously mapped as shown in FIG. 4, and shift control is performed based on this mapped shift pattern. In this case, in order to avoid frequent shifts, as shown in FIG. 4 as well, the upshift lines U ₁₂ , U ₂₃ , U ₃₄ (see the solid line in FIG. 4) and the downshift lines D ₂₁ , D ₃₂ , D _43. (See the dotted line in FIG. 4) and the hysteresis zones H ₁₂ , H ₂₃ , H
₃₄ is set.

[Problems to be solved by the invention]

However, in such a conventional shift control device for an automatic transmission, if it is preferable to use a shift stage as high as possible in terms of noise, fuel consumption, etc., when rapid acceleration is not required, the vehicle speed is increased by acceleration. The running state of the vehicle crosses the downshift lines D ₂₁ , D ₃₂ , and D ₄₃ to reach the hysteresis zone H.
_12, when the transition to H _23, H _34, unless further does not exceed the upshift line U _12, U _23, U _34, will be forced to travel in the still low transmission.

This causes the following problems. That is, the hysteresis zone H ₁₂ , H ₂₃ ,
In the case where the vehicle stays in H ₃₄ , it is actually possible to drive at a higher gear, but it is forced to travel at a lower gear, which is disadvantageous in terms of noise and fuel consumption.

The present invention is intended to solve such a problem, and an object thereof is to provide a shift control device for an automatic transmission which is excellent in acceleration / deceleration performance and is advantageous in terms of noise, fuel consumption, and the like.

[Means for solving problems]

Therefore, a shift control device for an automatic transmission according to the present invention includes an automatic transmission having a shift line in which an upshift line and a downshift line coincide with each other in a vehicle, and a shift control unit for the automatic transmission. When the traveling state of the vehicle crosses the shift line from the low speed side to the high speed side, a signal for upshifting can be output to the shift control unit at the time of transition to the high speed side, and the traveling state of the vehicle can be changed to the shift line. A shift control means capable of outputting a signal for downshifting to the shift control unit at the time of shifting from the high speed side to the low speed side on the low speed side, until a predetermined time elapses after the shift of the vehicle to the high speed side. Is a downshift inhibiting means for inhibiting a signal output for downshifting to the shift control section by the shift control means,
Upshift prohibiting means for prohibiting signal output for upshifting to the shift control section by the shift control means and a set acceleration / deceleration state are exceeded until a predetermined time elapses after the vehicle shifts to the low speed side. It is characterized in that a shift prohibition canceling means for canceling the shift prohibition by the above-mentioned upshift prohibiting means and downshift prohibiting means is provided.

[Work]

In the above-described shift control device for an automatic transmission of the present invention, when the traveling state of the vehicle changes within a range that does not exceed the set adjustment state and the shift line moves from the low speed side to the high speed side, the vehicle shifts up. However, downshifting is prohibited until a predetermined time elapses thereafter. On the other hand, when a predetermined time passes after crossing the shift line from the high speed side to the low speed side,
Downshifting is performed, but upshifting is prohibited until a predetermined time elapses thereafter.

However, when the running state of the vehicle changes beyond the set acceleration / deceleration state, upshifting or downshifting is performed immediately after crossing the shift line.

〔Example〕

A shift control device for an automatic transmission according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram thereof, FIG. 2 is a flow chart for explaining its action, and FIG. It is a graph which shows a shift pattern example.

Now, as shown in FIG. 1, an automobile equipped with this device has an automatic transmission (automatic transmission) 4 connected to an engine 1 via a torque converter 3 with a damper clutch 2. The damper clutch 2 bypasses the torque converter 3 and directly transmits the torque from the engine 1 to the automatic transmission 4. The damper clutch 2 has an appropriate slip even in the engaged state.

Further, a hydraulic control device 5 for the automatic transmission 4 is provided, and the hydraulic control device 5 includes a damper clutch control solenoid 6 for controlling the disengagement of the damper clutch 2 and a shift control (shift timing control or shift control). Shift control solenoids 7 and 8 and a pressure control valve 9 are provided as a shift control unit for the automatic transmission 4 that performs (time hydraulic control).

A control signal is supplied from the computer 10 to each of the damper clutch control solenoid 6, the shift control solenoids 7 and 8 and the pressure control valve 9.

In addition to the vehicle speed sensor 11 that detects the vehicle speed and the throttle opening sensor 12 that detects the opening degree of the throttle valve, the computer 10 also receives the engine speed, the output speed of the automatic transmission 4, and the kick of the automatic transmission 4. A signal from a sensor 13 that detects the number of rotations of the down drum 4a, the cooling water temperature, etc. is input.

By the way, a shift pattern as shown in FIG. 3 is stored in the computer 10 as a map, and the computer 10 is arranged to take a shift speed according to the shift pattern.
Receives a signal from the vehicle speed sensor 11, the throttle opening sensor 12, etc. and outputs a control signal to the shift control solenoids 7, 8 etc.

That is, the automatic transmission 4 has upshift lines U ₁₂ , U
₂₃ and U ₃₄ and the downshift lines D ₂₁ , D ₃₂ and D ₄₃ have shift lines S ₁₂ , S ₂₃ and S ₃₄ which coincide with each other. Here, the shift lines S ₁₂ , S ₂₃ , and S ₃₄ are all set to the low rotation side to the extent that there is no inconvenience caused by vibration or the like.

Further, the computer 10 determines that the traveling state of the vehicle is from the low speed side (L side) to the high speed side (H side) on the shift lines S ₁₂ , S ₂₃ and S _34.
Side), a signal for upshifting can be output to the shift control solenoids 7, 8 and the like at the time of shifting to the high speed side, and the running state of the vehicle is determined by the shift lines S ₁₂ , S ₂₃ , S.
A signal for downshifting when shifting from the H side to the L side over the ₃₄ side at the low speed side shift control solenoids 7, 8
When the traveling state of the vehicle exceeds the shift lines S ₁₂ , S ₂₃ , S ₃₄ from the L side to the H side (that is, after the vehicle shifts to the high speed side), a predetermined time (for example, after shifting to the high speed side). m
Downshift prohibiting means DIM for prohibiting signal output for downshifting to the shift control solenoids 7, 8 etc. by the shift control means CM until the second) elapses, and the running state of the automobile corresponds to the shift lines S ₁₂ , S ₂₃ , S. ₃₄ from H side to L
When the vehicle speed is exceeded (that is, after the vehicle shifts to the low speed side), a shift control means CM is used until a predetermined time (for example, n seconds) elapses.
Upshift prohibiting means UIM for prohibiting signal force for upshifting to the shift control solenoids 7, 8 and the like, and when the set acceleration / deceleration state is exceeded, upshift prohibiting means UIM and downshift prohibiting means DIM cancel the shift prohibition. It has the respective functions of the shift prohibition canceling means SRM.

Therefore, according to this device, the following shift control is possible. That is, the running state of the vehicle changes within a range that does not exceed the set acceleration / deceleration state (the state in which the throttle opening change or the vehicle speed change reaches a predetermined value), and the shift lines S ₁₂ , S ₂₃ ,
At the time of shifting from the L side to the H side over S ₃₄ , an upshift is performed, but after that, a predetermined time (n
Downshifting is prohibited until (seconds) has elapsed. On the other hand, when a predetermined time (n seconds) elapses after the shift lines S ₁₂ , S ₂₃ , S ₃₄ are crossed from the H side to the L side, the downshift is performed, and thereafter, until the predetermined time (m seconds) elapses. Are prohibited from upshifting.

However, if the running state of the vehicle changes so as to exceed the set acceleration / deceleration state, the shift lines S ₁₂ , S ₂₃ , S ₃₄
Upshifts or downshifts are made as soon as you cross the road.

As a result, traveling at the highest possible shift speed is realized, and further, feeling does not deteriorate due to the shift, and it is advantageous in terms of noise and fuel consumption. It also has excellent acceleration / deceleration performance.

A generalized flow of the above shift operation is shown in FIG. In FIG. 2, P indicates the flag processing. In this flow chart, P = 0 at the beginning, and once the shift lines S ₁₂ , S ₂₃ , S ₃₄ are crossed from the L side to the H side, P =
Is set to 1.

〔The invention's effect〕

As described above in detail, according to the shift control device for an automatic transmission of the present invention, an automatic transmission having a shift line in which an upshift line and a downshift line coincide with each other in a vehicle, and And a gear change control unit for outputting a signal for upshifting to the gear change control unit when the traveling state of the vehicle crosses the shift line from the low speed side to the high speed side and moves to the high speed side. The shift control means is capable of outputting a signal for downshifting to the shift control unit at the time of shifting to the low speed side where the state crosses the shift line from the high speed side to the low speed side. Downshift inhibiting means for inhibiting signal output for downshifting to the shift control section by the shift control means until a predetermined time elapses, and a predetermined time elapses after the vehicle shifts to the low speed side. Is an upshift inhibiting means for inhibiting a signal output for upshifting to the gearshift control section by the shift control means, and a shift inhibition by the upshift inhibiting means and the downshift inhibiting means when the set acceleration / deceleration state is exceeded. With a simple configuration in which a shift prohibition canceling means for canceling the shift is provided, it is advantageous in terms of noise and fuel consumption, and also has an effect of being excellent in acceleration / deceleration performance.

[Brief description of drawings]

1 to 3 show a shift control device for an automatic transmission as an embodiment of the present invention. FIG. 1 is a schematic configuration diagram thereof, FIG. 2 is a flow chart for explaining its action, and FIG. FIG. 4 is a graph showing an example of the shift pattern, and FIG. 4 is a graph showing an example of the shift pattern in the conventional shift control device for an automatic transmission. 1 ... Engine, 2 ... Damper clutch, 3 ... Torque converter, 4 ... Automatic transmission, 4a ... Kickdown drum, 5 ... Hydraulic control device, 6 ... Damper clutch control solenoid, 7, 8 ... ... shift control solenoid that constitutes a shift control unit, 9 ... pressure control valve, 10 ... computer, 11 ... vehicle speed sensor, 12 ... throttle opening sensor, 13 ... other sensors, CM ... shift control means , DIM ...... downshift inhibiting _{means, S 12, S 23, S} 34 ...... shift line, S
RM: shift prohibition canceling means, UIM: upshift prohibiting means.

Claims (1)

[Claims] 1. An automatic transmission having a shift line in which an upshift line and a downshift line coincide with each other, a shift control section for the automatic transmission, and a running state of the vehicle is the shift line. A signal for upshifting can be output to the shift control unit when shifting from the low speed side to the high speed side at the high speed side, and the running state of the vehicle shifts from the high speed side to the low speed side to the low speed side. A shift control means capable of outputting a signal for downshifting to the shift control part at the time of the above, and the shift control part by the shift control means until a predetermined time elapses after the vehicle shifts to the high speed side. Downshift prohibiting means for prohibiting signal output for downshifting to the shift control means, and upshift to the shift control section by the shift control means until a predetermined time elapses after the vehicle shifts to the low speed side. Upshift prohibition means for prohibiting the signal output for the shift, and shift prohibition cancellation means for canceling the shift prohibition by the upshift prohibition means and the downshift prohibition means when the set acceleration / deceleration state is exceeded are provided. A characteristic shift control device for an automatic transmission.