Control method for synchronizing rotating speed in power upshift of wet-type double clutch automatic transmission

Abstract

The invention provides a control method for synchronizing rotating speed in power upshift of a wet-type double clutch automatic transmission. The control method divides a rotating speed synchronizingstage in the power upshift process in detail into a rotating speed disengaging stage, a rotating speed closed-loop control stage and a recovery stage and the control methods in the stages are improved, so that clutch coupling is achieved better when the rotating speed is synchronized. Meanwhile, a torque request of an engine is controlled precisely, and impact generated by synchronizing the rotating speed is avoided to the maximum extent.

Description

technical field [0001] The invention belongs to the shift control technology of an automobile automatic transmission, in particular to the shift control technology of a wet dual-clutch automatic transmission (DCT for short). Background technique [0002] At present, vehicles equipped with automatic transmissions are becoming more and more popular, and consumers have higher and higher requirements for the shift quality of automatic transmissions. Most of the existing calibration and matching technologies for shift quality of dual-clutch automatic transmissions are in the hands of foreign OEMs. Most of the dual-clutch automatic transmissions independently developed in China have problems such as shift frustration and impact to varying degrees, which cannot meet consumers' needs for shift quality. [0003] Since it is impossible to know the control logic of the power upshift of foreign automatic transmissions, we can only conduct a preliminary analysis from the cracked part of ...

AI Technical Summary

Problems solved by technology

[0002] At present, vehicles equipped with automatic transmissions are becoming more and more popular, and consumers have higher and higher requirements for the shift quality of automatic transmissions. Most of the existing calibration and matching technologies for shift quality of dual-clutch automatic transmissions are in the hands of foreign OEMs. Most of the domestic self-developed dual-clutch automatic transmissions have varying degrees of shifting frustration and impact, which cannot meet consumers' needs for shifting quality.

[0003] Since it is impossible to know the control logic of the power upshift of foreign automatic transmissions, we can only conduct a preliminary analysis from the cracked part of the signal. Vehicles equipped with dual-clutch automatic transmissions have problems such as shifting shocks during the shifting process.

figure 1 The data of a dual-clutch automatic transmission vehicle's power upshift and speed synchronization stage, analyzed from the data, shows that the separation clutch disengages quickly in the initial stage of speed synchronization, which causes jitter when the input shaft speed is separated from the engine speed; in the middle of the speed drop, the slope of the engine speed There are obvious segments, and acceleration fluctuations appear; in the speed synchronization stage, the synchronization time is long, causing the clutch to slip for a long time

Images