Fault Diagnosis Method for Wet Disengagement Clutch Disengagement of Hybrid Electric Vehicle

Abstract

The invention provides a method for diagnosing the disconnection fault of the hybrid electric vehicle wet separation clutch applicable to the P2 configuration, and divides the separation fault of the wet separation clutch into two types: one is the mechanical failure of the separation clutch, that is, during the Clutch disengagement failure caused by failure of clutch components. This failure is judged according to the difference between engine torque, engine speed and motor speed, actual pressure of the separation clutch and clutch command current; the other is hydraulic system failure, that is, during the separation process of the separation clutch , due to the failure of the solenoid valve in the oil circuit or the failure of the oil circuit pressure, the separation clutch separation failure is judged according to the command pressure, command current and actual pressure of the separation clutch. The invention realizes the diagnosis of the separation failure of the wet separation clutch from two aspects of the mechanical failure of the clutch and the failure of the hydraulic system during the operation of the whole vehicle, and can quickly and accurately locate the cause of the failure.

Description

technical field [0001] The invention belongs to the technical field of automobile clutch fault diagnosis, and in particular relates to a separation fault diagnosis method for a wet separation clutch of a hybrid car. Background technique [0002] New energy vehicles have the advantages of low fuel consumption and low emissions, and can effectively solve the environmental pollution problems caused by traditional pure fuel vehicles. The state implements energy conservation and emission reduction policies, and puts new energy vehicles in a national strategic position as a key research and development direction. Hybrid electric vehicle is a kind of new energy vehicle, which has the advantages of low fuel consumption, high mileage and mature technology. It is an important direction for the development of major automobile companies in the future. [0003] In the P2 configuration hybrid electric vehicle, the wet separation clutch is located between the engine and the power motor to...

AI Technical Summary

Problems solved by technology

[0005] The patent with the application number CN 104265876 A discloses a diagnostic method for the clutch separation failure of a mechanical automatic transmission. The actuator is a pneumatic solenoid valve, and the clutch is a dry clutch. The mechanical structure and principle are different from the wet separation clutch. It is suitable for fault judgment of dry clutches; and this technical solution only judges the separation fault of the clutch through the clutch control command and the position signal fed back by the clutch position sensor, without considering factors such as the speed difference between the driving end and the driven end of the clutch, when the clutch position It is easy to misjudge when the sensor fails

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