Wet-type double-clutch automatic transmission electromagnetic valve characteristic curve compensation method

Abstract

The invention provides a wet-type double-clutch automatic transmission electromagnetic valve characteristic curve compensation method. The method comprises the following steps: computing the current expectation pressure of the clutch under actual working condition, judging whether to perform compensation treatment, wherein the compensation treatment comprises oil temperature compensation and / or hysteresis compensation, if so, obtaining a compensation value, and computing a final expectation pressure according to the compensation value and the current expectation pressure; searching a corresponding current value in the electromagnetic valve characteristic curve under basic oil temperature according to the final expectation pressure, and exerting the searched current value on the electromagnetic valve; if not, searching the corresponding current value in the electromagnetic valve characteristic curve under base oil temperature according to the current expectation pressure, and exerting the searched current value on the electromagnetic valve. The control precision of a transmission control unit to the transmission is improved.

Description

technical field [0001] The invention relates to the field of automobile control, in particular to the field of gearbox control. Background technique [0002] The wet dual-clutch automatic transmission includes two clutches, which are respectively connected to two input shafts, and the odd-numbered and even-numbered gears of the transmission are respectively distributed on the two input shafts. The combination and separation of the two clutches are controlled by the oil pressure in the hydraulic oil circuit, so as to realize torque transmission and disconnection. [0003] The combination, separation, and cooling of the two clutches in the wet dual-clutch automatic transmission, as well as the synchronizer and shift fork actions corresponding to each gear, are all realized by controlling the pressure in the oil circuit through the transmission hydraulic module. [0004] The control logic and control software of the wet dual clutch automatic transmission are stored in the tran...

AI Technical Summary

Problems solved by technology

However, the characteristic curve of the solenoid valve is greatly affected by the temperature of the transmission oil, and is affected by the physical characteristics of the solenoid valve itself. , when working conditions such as tip in (acceleration) and tip out (deceleration) change, the current intensity applied to the solenoid valve needs to change accordingly, but this change does not strictly correspond to the pressure and current values ​​in the P-I characteristic curve relationship (which creates hysteresis), these issues result in reduced control accuracy

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