Multi-power-source coordinated control method used during gear shifting of hybrid electric vehicle

Abstract

A multi-power source coordinated control method in the gear shifting process of a hybrid automobile; the power of each power source is respectively coupled to a gearbox input shaft (7) via respective clutches (51, 52) of a first power source end (1) and a second power source end (2), and is transferred to a constant meshing gear (6) of a corresponding gear via a synchronizer (4), and then transferred to the vehicle wheels through a gearbox output shaft (8) and then through the gear. The method comprises the steps of: a TCU receives a signal instruction of a gear required by the automobile; transmitting a torque reduction instruction to each power source and determining whether the torque is reduced to be within a target torque range; transmitting instructions for clutch release and synchronizer moving, and for each power source end to adjust speed; when determining that the synchronizer is in place and each power source end has completed speed adjustment, transmitting instructions for clutch engagement, and for each power source end to increase torque, and determining whether the torque is increased to be within a target torque range, thus completing gear shifting. The present invention subdivides torque control at each control stage in a gear shifting process, optimizes torque increase and reduction by each power source, and avoids jerking and bumping caused by inconsistency or rapid change of torque.

Description

technical field [0001] The invention relates to a control method for gear shifting of an automobile gearbox, in particular to a coordinated control method for multiple power sources during the gear shifting process of a hybrid electric vehicle. Background technique [0002] In the existing technology, most of the traditional shifting process adopts a single power source control method, the process of torque reduction and speed regulation is relatively simple, and the requirements for control accuracy are not high; or, dual power source control is adopted, but the power The sources are arranged on the same side of the gearbox for torque or speed closed-loop control. However, for multi-power source systems, it is necessary to consider the situation of arranging them on both sides of the gearbox at the same time, so as to coordinate the torque and speed of these power source systems. Accurate speed regulation, but also to ensure that the shift time can not be too long. In par...

AI Technical Summary

Problems solved by technology

In particular, during the shifting process of a hybrid electric vehicle, the coordinated control process of multiple power sources will involve the torque reduction stage of each power source that is directly coupled with the gearbox mechanism at the beginning of the shift, and after the torque reduction is completed, the clutch is opened. The whole control process is quite complicated in the speed regulation stage of each power source and the torque-up stage of each power source after the speed regulation is completed. If the control is not done properly, it will cause frustration and impact due to the uneven torque or too fast change rate, and the speed regulation time will be too long. Long, inaccurate speed regulation, damaged clutch, affecting driving safety and many other problems

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