Engine torque control method suitable for sliding friction fault of clutch

Abstract

The invention discloses an engine torque control method suitable for a sliding friction fault of a clutch. When a slip fault occurs in the clutch, the slip frequency of the clutch is reduced by limiting the output torque of an engine, specifically, PI control based on the slip frequency of the clutch is added on the basis of fixed gear torque limitation, if the clutch does not slip under a feedforward limiting torque value based on a gear, the PI limiting torque does not to work, and if the clutch still slips under the feedforward limiting torque value based on the gear, the PI limiting torqueis used for continuing to reduce the limiting torque. According to the above control method, it is ensured that the slip frequency is reduced to a safe range when the slip fault occurs in the clutchin the process that a vehicle runs at the fixed gear, and the problem that the clutch possibly continue to slip in an existing method is solved; and a PI controller is adopted, the slip frequency of the clutch can be rapidly reduced after the slip fault occurs, the fault duration and adverse effects caused by the fault are reduced, and it is ensured that a transmission transmits power with the maximum capacity.

Description

technical field [0001] The invention relates to the technical field of automobile transmission control, in particular to an engine torque control method suitable for clutch slipping faults. Background technique [0002] With the development of technology, people's requirements for automobiles are not only satisfied with their passability and power, but also performance requirements such as safety, comfort and economy are becoming more and more obvious. The transmission is a key component in the vehicle transmission system, and its working effect will directly affect the above performance. In automatic transmissions, clutches are used to connect or disconnect power transmission lines to achieve different gear ratios. When the gear is held, all clutches can only be in the locking phase or disengagement phase. The controller can change the torque capacity of the clutch by controlling the clutch oil pressure to ensure enough torque from the engine to be transmitted. In this c...

AI Technical Summary

Problems solved by technology

However, the clutch may still slip at this torque limit, causing increased clutch wear

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