Method for controlling parallel hybrid electric vehicle gear shifting
A technology of a hybrid electric vehicle and a control method is applied in the field of vehicle control to achieve the effects of maintaining vehicle speed, simplifying shifting steps, and reducing shifting time.
Active Publication Date: 2015-04-08
TSINGHUA UNIV
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Problems solved by technology
[0004] The present invention proposes a shift control method for a parallel hybrid electric vehicle to solve the problems existing in the prior art
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Embodiment 1
[0021] The feature of the present invention is that after the gear shift statement, the engine and the motor are firstly unloaded, and the engine is unloaded to the friction torque of the engine, that is, the engine output torque is 0, and the motor output torque is also unloaded to 0. When the torque of the input shaft of the transmission gradually decreases to zero torque meshing between the synchronous gear and the output shaft gear, the transmission performs a shifting action, and then the motor provides an instantaneous torque to adjust the speed of the transmission input shaft to the target speed range, and the transmission shifts into gear, thereby To complete clutchless quick shifting, it includes the coordinated work of the vehicle controller, motor controller and automatic transmission controller.
[0022] see figure 1 , figure 1 It is a flow chart of a shift control method for a parallel hybrid electric vehicle according to an embodiment of the present invention. ...
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The invention provides a method for controlling parallel hybrid electric vehicle gear shifting. The method comprises: first, torque control step: after a gear shifting point is reached, the torques of an engine and a motor are unloaded, the torque of an input shaft of a transmission is gradually reduced until a synchronous gear and an output shaft gear are in zero torque meshing with each other, and the transmission carries out a neutral motion; speed regulation step: the motor provides instaneous torque, and the rotating speed of the input shaft of the transmission is regulated within a target rotating speed scope; and second, torque control step: a transmission controller sends a torque mode request to a whole vehicle controller, and the engine and the motor return to the normal torque output modes. According to the method, through the cooperative control of the engine, the motor and the automatic transmission, the gear shifting steps are simplified, the gear shifting time is reduced, the gear shifting impact to a transmission system is reduced, the stable vehicle speed is maintained, and the service life of a clutch is prolonged.
Description
technical field [0001] The invention relates to the field of vehicle control, in particular to a shift control method for a parallel hybrid electric vehicle. Background technique [0002] Nowadays, cars are becoming more and more popular, entering more and more people's families, and the handling of cars is getting more and more attention from people. The mechanical automatic transmission can reduce the shifting time of the car, reduce the shock of shifting, simplify the driver's operation steps, and prolong the service life of the clutch. The traditional mechanical manual transmission requires the driver to operate the clutch before shifting gears, first separate the clutch, and then pick up the gear. The transmission input shaft and output shaft are synchronized through the synchronization ring, and then the driver engages the clutch. The whole process is manually operated, resulting in long shifting time, easy to cause driver fatigue, and easy to cause car shifting impac...
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IPC IPC(8): B60W30/18B60W10/06B60W10/08B60W10/10
Inventor 黄开胜曾祥瑞孟凡博
Owner TSINGHUA UNIV