Clutch temperature control method and system for wet type DCT

Abstract

The invention discloses a clutch temperature control method and system for a wet type DCT. The method comprises the steps that according to oil temperature of a transmission, rotating speed of an engine, a shifting fork position signal, a gear signal, surface temperature of a first clutch, surface temperature of a second clutch, friction power of the first clutch, the friction power of the secondclutch and pressure of a main oil path, actual lubricating flow flowing into a clutch assembly is calculated; according to the actual lubricating flow flowing into the clutch assembly, the rotating speed of the engine, the oil temperature of the transmission, the friction power of the first clutch and the friction power of the second clutch, the surface temperature of the first clutch and the surface temperature of the second clutch are calculated; and then according to the surface temperature of the first clutch, the surface temperature of the second clutch and the oil temperature of the transmission, whether the clutch assembly is overheated or not is judged, and overheating protection is started in a hierarchical mode. By adopting the control method and system, accurate surface temperature of the clutches can be obtained, and the surface temperature of the clutches combines with the oil temperature of the transmission to be taken as a judgment basis for carrying out clutch overheating protection.

Description

technical field [0001] The invention relates to the technical field of automatic transmissions for automobiles, in particular to a wet DCT clutch temperature control method and system. Background technique [0002] A wet DCT (Dual Clutch Transmission) consists of two input shafts. One input shaft controls the odd-numbered gears and the other controls the even-numbered gears. When changing gears, one clutch loses power to the engaged gear while the other clutch enables The pre-engaged gears get power, and the continuous transmission of power is realized through the alternate work of the two clutches. [0003] If the heat generated when the wet multi-plate clutch is engaged cannot be dissipated through the cooling system in time, the clutch friction plate and the counter steel plate may become overheated and fail due to heat accumulation. Unnecessary clutch drag torque increases the fuel consumption of the vehicle; therefore, in actual engineering applications, appropriate cl...

AI Technical Summary

Problems solved by technology

In this way, the calculation of the heat dissipated by the components of the clutch itself is relatively complicated, and the accuracy of the calculation results is not high

[0005] CN105156645A discloses a clutch temperature control method and system of a wet dual-clutch transmission, which describes the temperature protection mechanism when the clutch is overheated, but its overheating condition judgment is not comprehensive and accurate enough, and the first and second clutches are both overheated. open, without considering the driving performance of the car

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