Torque determination method and device for double clutch during downshift
By acquiring engine torque and inertial torque, and calculating the friction coefficient compensation coefficient of the dual clutch, the problem of inaccurate torque transmission during downshifting of the dual clutch is solved, achieving higher torque accuracy and improved overall vehicle performance.
CN117628164BActive Publication Date: 2026-07-21SAIC MOTOR
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SAIC MOTOR
- Filing Date
- 2022-08-17
- Publication Date
- 2026-07-21
AI Technical Summary
Technical Problem
During vehicle operation, inaccurate torque transmission during downshifting of a dual-clutch transmission can affect overall vehicle performance.
Method used
By acquiring the torque and inertial torque sent by the engine, the target transmission torque of the disengaged clutch is determined, and the friction coefficient compensation coefficient is calculated. Based on the target transmission torque and the friction coefficient compensation coefficient, the final transmission torque is determined, taking into account the speed difference between the clutch and the engine.
Benefits of technology
It improves the torque accuracy during dual-clutch downshifting, thereby enhancing the overall vehicle's driving performance.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117628164B_ABST
Abstract
The embodiment of the present application provides a torque determination method and device when a double clutch downshifts, obtains a first torque sent by an engine and an inertial torque when an engine speed reaches a target acceleration, determines a target transmission torque of a split clutch according to the first torque and the inertial torque, determines a target speed difference between the split clutch and the engine, obtains a friction coefficient compensation coefficient of the split clutch when the target speed difference, and determines a final transmission torque of the split clutch according to the target transmission torque and the friction coefficient compensation coefficient. Considering the speed difference between the split clutch and the engine when shifting, the final transmission torque of the split clutch obtained by calculation is more accurate than a calibration value in the prior art, can provide a torque with higher accuracy in the downshift process, and can improve the driving performance of the whole vehicle.
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