Self-learning optimization method and system for half-engagement point of wet double clutch

A wet dual-clutch, half-joint technology, applied in the direction of clutches, mechanical equipment, etc., can solve problems such as poor low-speed torque control performance, and achieve the effect of eliminating adverse effects and good robustness

CN107100947AActive Publication Date: 2017-08-29SHANGHAI AUTOMOBILE GEAR WORKS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-08-29

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Abstract

The invention discloses a self-learning optimization method and system for a half-engagement point of a wet double clutch. The rotating speed of an engine flywheel is monitored in real time in the accelerator-free upshift working condition, the value of a clutch target current corresponding to the change inflection point moment of the engine flywheel is recorded, then the value of the difference between the clutch target current and the previous self-learning inflection point current is calculated, the obtained difference value is used for correcting the current value, corresponding to the half-engagement joint of the clutch, of an electromagnetic valve of the clutch, further the pressure, corresponding to the half-engagement point, between friction plates of the clutch is changed, and therefore adverse effects of abrasion on low-speed torque control of the clutch are eliminated or weakened.
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Description

technical field

[0001] The invention relates to a technology in the field of transmission control, in particular to a method and system for self-learning optimization of wet double clutch semi-joint points. Background technique

[0002] The half-engagement point of the clutch is the relative position of the friction plate when the clutch first transmits torque, and it will change with the temperature and wear of the clutch friction plate. In the dual-clutch automatic transmission, the clutch will frequently open and engage during the entire life cycle. Due to the speed difference between the master and driven discs of the clutch, the friction plates of the clutch will wear, especially during the engagement process. After the vehicle has been driven for a long distance, the accumulation of wear and tear is considerable. The control algorithm of the wet clutch using the hydraulic actuator as the driving mechanism obtains the target control current by checking the torque-press...

Examples

Embodiment Construction

[0025] This embodiment is used for the hybrid electric vehicle of wet dual-clutch, and its method for self-learning optimization of odd-numbered clutch semi-joint points comprises the following steps:

[0026] The driver drives the vehicle with an accelerator of about 30%. When the vehicle speed reaches 35Km / h, the accelerator pedal is completely released. At this time, the vehicle will enter the process of upgrading from 2nd gear to 3rd gear without accelerator.

[0027] Stage S10: When the vehicle is in the process of upshifting without throttle, when it detects that the engine speed has dropped to the reference speed of 1888.6rpm / min under the action of the drag torque, the TCU will set the torque request flag and pass the torque request value 3Nm through the controller The LAN bus is sent to the engine controller;

[0028] Stage S20: After the engine receives the torque request flag from the TCU, the engine output torque is about 3Nm at this time. After this torque is bala...