A Method for Determining Semi-coupling Point of Wet Dual Clutch Transmission

Abstract

The invention discloses a method for determining the semi-coupling point of a wet dual-clutch transmission. The method for determining the semi-coupling point of the wet dual-clutch transmission comprises the following steps: detecting the oil temperature of the transmission when the wet dual-clutch transmission shifts gears, and when the oil temperature is within the normal range When the oil temperature is low, gradually increase the input pressure of the shift-in clutch, and at the same time judge the pressure of the half-joint point of the clutch according to the change trend of the speed difference between the input shaft and the output shaft of the transmission; when the oil temperature of the transmission is at a low temperature, gradually increase the input pressure of the shift-in clutch , at the same time judge the pressure of the clutch half-engagement point by the speed difference between the transmission input shaft and the output shaft and the change trend of the output shaft torque. It can quickly and efficiently control the pressure of the clutch half-joint point under different oil temperature conditions, effectively avoiding the phenomenon of shifting shock and power cycle.

Description

technical field [0001] The invention relates to the technical field of clutch control, in particular to a method for determining a half-joint point of a wet dual-clutch transmission. Background technique [0002] Wet dual-clutch transmission is a newly developed automatic transmission in recent years. Compared with other automatic transmission solutions, wet dual-clutch transmission can provide uninterrupted power output during the shifting process and can ensure effective heat dissipation of the clutch. . [0003] When the oil temperature of the transmission is within the normal operating temperature range, due to factors such as clutch wear and oil quality degradation, the clutch half-engagement point will change compared with the pre-set half-engagement point of the system. The engagement point controls the shifting of the clutch. When the clutch is quickly filled with oil to this pressure, it has not yet reached the ideal half-engagement point pressure of the clutch, wh...

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Problems solved by technology

[0003] When the oil temperature of the transmission is within the normal operating temperature range, due to factors such as clutch wear and oil quality degradation, the clutch half-engagement point will change compared with the pre-set half-engagement point of the system. The engagement point controls the shifting of the clutch. When the clutch is quickly filled with oil to this pressure, it has not yet reached the ideal half-engagement point pressure of the clutch, which will cause excessive wear of the clutch during the shifting process of the transmission, affecting the service life. More importantly, If the shifting time is prolonged, the shifting response of the whole system will slow down; if the oil pressure builds up too much, there will be a large shifting impact, and there will be shifting frustration, which will affect the ride comfort

[0004] When the oil temperature of the transmission is in low temperature conditions, such as cold start conditions, the viscosity of the oil is high and the fluidity is poor due to the low temperature of the oil. If the half-engagement point of the clutch controls the shifting of the clutch, it will cause excessive slippage of the clutch and cause difficulty in starting.

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