Limp home control method of double-clutch automatic transmission

Abstract

The invention provides a limp home control method of a double-clutch automatic transmission. The limp home control method includes collecting vehicle speed signals, clutch input rotating speed signals, rotating speed signals of an inner input shaft, rotating speed signals of an outer input shaft, rotating speed signals of an output shaft and position signals of a gear-shifting shift fork; when the position signals of the gear-shifting shift fork are lost completely, checking whether a current gear position is matched or not according to the vehicle speed signals, the clutch input rotating speed signals and speed ratio of the current gear position; if yes, maintaining the current gear position for traveling, and if not, performing odd-even gear position switching. By the limp home control method, a vehicle can be maintained to normally travel without stopping under the condition that the position signals of the shift fork are lost completely, so that 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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