Method and system for determining a semi-linkage point

Abstract

The invention discloses a semi-linkage point determination method and system. The method comprises the steps that after a standard oil pressure is determined, oil filling is conducted on a clutch under the standard oil pressure; the standard oil pressure is gradually reduced according to the predetermined step size until the engine revolving speed decreasing quality reaches a second set threshold value and the engine static torque rises; the time interval that a vehicle starts to move from a static state under the oil pressure corresponding to the second set threshold value is acquired; a plurality of oil pressures corresponding to the second set threshold value and a plurality of time intervals that the vehicle starts to move from the static state under the oil pressures corresponding to the second set threshold value are acquired through the steps, and a minimum value is selected from the time intervals; the oil pressure corresponding to the minimum value is taken as the oil pressure of a semi-linkage point corresponding to a predetermined oil temperature of a current gear. According to the method and system, the clutch can respond most quickly on the premise of ensuring the gear shifting smoothness, and the problem that in the prior art, the clutch responds slowly or has the impact sense when combination is conducted due to the fact that the semi-linkage point is selected improperly is solved.

Description

technical field [0001] The invention relates to the field of clutch control, in particular to a method and system for determining a semi-linkage point. Background technique [0002] The wet clutch automatic transmission has been paid more and more attention due to the advantages of fast shifting speed and high transmission efficiency. The working principle of the wet clutch is as follows: During the clutch engagement process, the pressure oil enters the side of the clutch cylinder through the oil passage and pushes the piston to the other side. The side movement presses the friction plate to realize the synchronous movement of the driving side and the driven side of the clutch. During the oil filling process of the clutch, the pressure relief hole is sealed by the barrier, so there is no pressure oil leakage; while in the oil discharge stage, the barrier no longer blocks the pressure relief hole under the action of centrifugal force, and the pressure relief hole is opened, s...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method and system for determining a semi-linkage point, which solves the problem in the prior art that improper selection of a half-linkage point will lead to slow response of the clutch or a sense of shock when combined

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