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Shift control method and control device for dual clutch transmission under coasting downshift condition

A dual-clutch transmission and control method technology, which is applied in the direction of transmission control, elements with teeth, belts/chains/gears, etc., can solve problems such as alternating impact and noise, and achieve the effect of eliminating noise.

Active Publication Date: 2019-12-24
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is that when the existing automobile is stepping on the gas pedal in the process of coasting down, the transmission parts connected with the clutch to be separated are prone to alternating shocks and generate noise.

Method used

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  • Shift control method and control device for dual clutch transmission under coasting downshift condition
  • Shift control method and control device for dual clutch transmission under coasting downshift condition
  • Shift control method and control device for dual clutch transmission under coasting downshift condition

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Embodiment Construction

[0020] A dual clutch transmission (DCT for short) has two input shafts, which serve as input shafts for odd gears and even gears respectively, and are respectively controlled by odd and even clutches.

[0021] When the DCT transmits power stably, only one input shaft works. At this time, the transmission controller (TCU, Transmission Control Unit) judges the target gear to be engaged according to the driving state of the car, and the target gear must be on the other input shaft. On the axle, and the clutch connected with it does not transmit power because it is not engaged, so this target gear just can hang in advance. When the TCU judges that the vehicle speed reaches the shift point, the two clutches are controlled interactively (that is, the current gear is disengaged and the target gear is engaged) to complete the gear shift. After the gear shift is completed, the TCU controls the next target gear to be engaged in advance according to the vehicle state, continues to wait f...

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PUM

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Abstract

The invention discloses a gear shifting control method of a double-clutch transmission under glide downshift working conditions and a control device. The control method comprises the following steps:when accelerator signals are monitored in the gear shifting process, a first control instruction is sent to a clutch to be separated to control total opening of the clutch to be separated, so that thealternating impact between transmission parts connected with the clutch to be separated is prevented, and the noise caused by the alternating impact is eliminated.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a shift control method and a control device of a dual-clutch transmission under a sliding downshift working condition. Background technique [0002] During the running of a car, sliding downshifts and stepping on the accelerator during the sliding downshifts are common driving styles of drivers. Among them, coasting downshift refers to the driving state in which the driver releases the accelerator, the engine does not transmit power, and the car still keeps running due to inertia and the speed drops. In the process of coasting downshift, the engine is in the reverse drag state, and it is driven by the wheels to rotate. Stepping on the accelerator during the coasting downshift is a common driving method for the driver to change his intention. When the driver steps on the accelerator, the engine starts to retransmit power to drive the wheels to rotate, thus turning into a forward drag s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/04F16H59/50
CPCF16H59/50F16H61/02F16H61/04
Inventor 贺军马春狮张东波王晓伟虞璐伊岳甫营韩冬罗品奎
Owner SAIC MOTOR
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