Gear-shifting control method for driving intention change during kick-down process

A technology of kickdown and driving intention, applied in the direction of transmission control, components with teeth, belt/chain/gear, etc., can solve the problems of reducing the mass of the transmission, achieve smooth shifting, and improve fuel economy Effect

Active Publication Date: 2015-12-09
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method provides a method of synchronizing the speed of the transmission drive shaft to the target speed by using the intermediate gear synchronous clutch or the engine clutch. This method is suitable for the working condition of downshifting across multiple gears, and using this method In the future, the synchronizer can be designed to be smaller, which is conducive to reducing the mass of the transmission and is beneficial to the fuel economy of the vehicle. However, this patent does not take into account the more complicated driving during the kick-down process involved in the patent of the present invention. Intention to change the control method for upshifting

Method used

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  • Gear-shifting control method for driving intention change during kick-down process
  • Gear-shifting control method for driving intention change during kick-down process
  • Gear-shifting control method for driving intention change during kick-down process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The method maintains real-time monitoring of the accelerator pedal when the transmission starts the process of kicking down, and when the accelerator pedal is released, judges the driving intention according to the driving state, and adjusts the state of the transmission from kickdown control to Gear recovery or upshift control.

[0033] The kick-down control includes: kick-down odd-numbered gears (1, 3 gears) control and kick-down even-numbered gears (2, 4 gears), wherein:

[0034] Forcibly down odd-numbered gear control, including the following steps:

[0035] 1) The target gear synchronizer action stage (O1 stage), while the engine speed is adjusted to the target gear input shaft speed;

[0036] 2) Target gear clutch pre-charge phase (O2 phase), at the same time the engine speed is adjusted to the target gear input shaft speed.

[0037] 3) The clutch where the current actual working gear is located and the clutch where the target gear is located are in the torque i...

Embodiment 2

[0059] This embodiment provides a method for updating the target gear to the original working gear before the kickdown due to the change of the driver's intention when interacting with the intermediate gear torque during the even-numbered gear down (2nd, 4th gear). control methods such as image 3 As shown, the specific implementation steps of this embodiment are as follows:

[0060] 1) Real-time monitoring of the status of the synchronizer and clutch, including: whether the target synchronizer is in place, whether the target clutch is pre-charged, engine speed, etc.;

[0061] 2) Even-numbered downshifts need to be transitioned with the aid of the intermediate odd-numbered gears. When the synchronizer of the intermediate gear is engaged and the clutch pre-charge of the intermediate gear is completed, torque interaction is performed between the original gear and the intermediate gear. When the change of the driver’s intention is detected (release the accelerator pedal), the ta...

Embodiment 3

[0066] This embodiment provides an even-numbered gear down (2nd, 4th gear) process, after the target gear synchronizer is engaged, due to the change of the driver's intention, the target gear is updated to the original work before the kick down Gear control methods, such as Figure 4 As shown, the specific implementation steps of this embodiment are as follows:

[0067] 1) Real-time monitoring of the status of the synchronizer and clutch, including: whether the target synchronizer is in place, whether the target clutch is pre-charged, engine speed, etc.;

[0068] 2) In the even-numbered gear down condition, when the middle gear takes over the power transmission, the synchronizer of the target gear is put in place, and then the clutch corresponding to the target gear is precharged, and the change of the driver’s intention is detected (release the accelerator pedal Pedal), at this time, re-judgment and update the target gear, if the predicted target gear is greater than or equa...

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Abstract

The invention discloses a gear-shifting control method for a driving intention change during a kick-down process in the field of automatic control of transmissions. The gear-shifting control method is characterized in that real-time monitoring of an accelerator pedal is maintained when a transmission starts the kick-down process, the driving intention is judged according to a driving state when the accelerator pedal is released, and the state of the transmission is adjusted from kick-down control to corresponding upshift control according to a judgment result. The gear-shifting control method aims to solve the problems that when a driver steps on an accelerator vigorously at a high rate during a stable driving process of a vehicle, a DCT (Dual Clutch Transmission) does kick-down action automatically to obtain stronger power output, and when the driver releases the accelerator at a higher rate before the DCT completes the kick-down action, a target gear obtained by the DCT through judgment is changed into one higher than the current kick-down target gear and immediately the upshift action is carried out. Therefore, through the gear-shifting control method, a stable and quick gear-shifting process can be realized actively, and the gear-shifting quality is remarkably improved.

Description

technical field [0001] The invention relates to a technology in the field of transmission automatic control, in particular to a gear shift control method for changing driving intention during a kick-down process in an automobile dual-clutch automatic transmission. Background technique [0002] The advantages of dual-clutch automatic transmissions are relatively simple and compact structure, high transmission efficiency, and quick shifting. Therefore, it can improve the power performance, fuel economy and driving comfort of the vehicle. A distinctive feature of the DCT shift process is that it involves the pre-action of the synchronizers and the interaction of the engine torque transmitted by the two clutches. Whether the cooperation between the synchronizer and the clutch, and between the odd and even clutches is timely and in line with the driver's intention is a difficult point in the development and design of the control strategy of the dual clutch automatic transmission....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/688F16H61/04F16H59/24
CPCF16H59/24F16H61/0403F16H61/688F16H2061/0015F16H2306/48
Inventor 丁健李育唐莹李欢讯
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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