Fault diagnosis method of hybrid electric vehicle wet type cut-off clutch separation

Abstract

The invention discloses a fault diagnosis method of p2 configuration hybrid electric vehicle wet type cut-off clutch separation. The fault diagnosis method divides the fault diagnosis of the cut-off clutch into two types that the one is a mechanical fault of the cut-off clutch; and the other is the fault of a hydraulic system. The mechanical failure of the cut-off clutch refers to the failure of the cut-off clutch due to the failure of the cut-off clutch components during the cut-off clutch separation process and the failure is judged by an engine torque, the difference between a engine speedand a motor speed, the actual pressure of the cut-off clutch and the cut-off clutch command current; and the fault of a hydraulic system refers that in the separation process of the cut-off clutch, the separation failure of the cut-off clutch caused by a solenoid valve fault in an oil circuit or the pressure fault in the oil circuit is judged by the command pressure, command current and actual pressure of the cut-off clutch. The invention realizes the fault diagnosis of the wet cut-off clutch through the two types of the mechanical fault of the cut-off clutch and the fault of a hydraulic system during the operation of the whole vehicle so that the cause of the failure can be quickly and accurately located.

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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