A limp-home control method for a dual-clutch automatic transmission

Abstract

The invention provides a method for controlling limping return to home through a double-clutch automatic transmission. The method comprises the steps that vehicle speed signals, clutch input rotating speed signals, inner input shaft rotating speed signals, outer input shaft rotating speed signals, output shaft rotating speed signals, shifting fork position signals, pressure signals of a first clutch and pressure signals of a second clutch are collected; when the pressure signals of the first clutch and the pressure signals of the second clutch are all lost, whether current gears are matched is verified according to the vehicle speed signals, the clutch input rotating speed signals and the speed ratio of the current gears; if the current gears are matched, a vehicle travels at the current gears; if the current gears are not matched, switching between odd gears and even gears is conducted, and only switching to lower gears is allowed if the current vehicle speed is higher than a preset value. By means of the method, the vehicle can keep normal traveling without a stop on the condition that all the pressure signals of the clutches are lost, and therefore the traveling safety is improved.

Description

technical field [0001] The invention relates to the field of automobile transmission control, in particular to a control method for a double-clutch automatic transmission limp home. Background technique [0002] Dual-clutch automatic transmission includes two coaxial nested or parallel arranged clutches, coaxial, inner and outer inner and outer nested input shafts and outer input shafts, output shafts, multiple synchronizer devices arranged on the output shafts, multiple It consists of a shift fork and a differential. The driving gears of the odd and even gears of the transmission are arranged on the inner and outer input shafts respectively, through the switching of two clutches and the actions of different synchronizers, torque conversion and output are realized. [0003] The limp home function refers to the fact that some parts of the transmission are damaged and cannot complete the normal use function, but it can still realize the output of vehicle power within a certai...

AI Technical Summary

Problems solved by technology

However, first of all, the premise of this method is that one of the two input shaft speed sensors can still work normally, and the limp home function cannot be realized when the entire set of input shaft speed sensors are abnormal; secondly, this method still needs to stop to shift gears Switching, which is still very dangerous in the driving process; again, this method can only drive in the set gear, and cannot perform normal gear switching, but when the road conditions are complicated, or when driving on the highway, Smooth gear shifting is a must to ensure safety

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