Hybrid vehicle, and downshift control method and system thereof

Abstract

The invention discloses a hybrid vehicle, and a downshift control method and system thereof. The hybrid vehicle includes an engine, a power motor, a power battery, a dual clutch transmission and an auxiliary motor connected to the engine. The downshift control method includes the following steps: obtaining the duration time of an inertial phase stage during a downshift process when the dual clutchtransmission enters the downshift process; obtaining the target torque of the auxiliary motor according to the duration time of the inertial phase stage; and controlling the positive torque operationof the auxiliary motor according to the target torque of the auxiliary motor so that the rising rate of the rotating speed of the engine can be enhanced. According to the downshift control method, the downshift time of the hybrid vehicle can be effectively shortened, the driving experience of users can be enhanced, and the service life of a clutch in the dual clutch transmission can be prolonged.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a downshift control method of a hybrid electric vehicle, a non-transitory computer-readable storage medium, a downshift control system of a hybrid electric vehicle and a hybrid electric vehicle. Background technique [0002] When a dual-clutch transmission is downshifted with positive torque, the engine speed will climb up to the speed corresponding to the target gear during the inertia phase of the downshift. This process is generally achieved through the interaction between the clutch and the engine in the dual-clutch transmission. The duration is relatively long, and users generally feel that the power is weakened. Moreover, during the downshifting process, the slipping work of the clutch in the dual-clutch transmission is relatively large, thereby accelerating the wear of the clutch and reducing the service life of the clutch. Contents of the invention [...

AI Technical Summary

Problems solved by technology

[0002] When a dual-clutch transmission is downshifted with positive torque, the engine speed will climb up to the speed corresponding to the target gear during the inertia phase of the downshift. This process is generally achieved through the interaction between the clutch and the engine in the dual-clutch transmission. The duration is relatively long, and users generally feel that the power is weakened

Moreover, during the downshifting process, the slipping work of the clutch in the dual-clutch transmission is relatively large, which will accelerate the wear of the clutch and reduce the service life of the clutch.

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