Method and device for dynamic coordination control of hybrid vehicle mode switching and gear shifting

Abstract

The invention provides a hybrid power vehicle mode switching and gear shifting dynamic state coordination control method and device. According to the control method, according to received and analyzed target gears, target power modes, a current gear and a current power mode, whether the current gear needs to be changed is judged, the mode switching type is judged, and then by clearing torque provided by a power providing device, controlling engaging and disengaging of a clutch, adjusting the rotating speed of the power providing device and other steps, mode switching and gear shifting are integrated into a total dynamic state coordination process. According to the control method, the conflict of successive executing of two processes with set priorities in the prior art is avoided, vehicle power failure time is shortened, the fact that a vehicle runs in a good power mode is guaranteed, and vehicle economy is improved.

Description

technical field [0001] The invention relates to the control field of hybrid electric vehicles, in particular to a dynamic coordination control method and device for mode switching and shifting of hybrid electric vehicles. Background technique [0002] With the support of national policies and its own unique fuel-saving properties, gasoline-electric hybrid vehicles have achieved rapid development. However, there are still some problems in the actual use of gasoline-electric hybrid vehicles. The most important problem is the poor dynamic control performance of the vehicle. [0003] The dynamic process of parallel hybrid electric vehicle mainly includes two processes of mode switching and gear shift coordination. Among them, the mode switching refers to the conversion of the three modes of hybrid mode, pure electric mode and pure engine mode during driving. Gear shift coordination means that the HCU needs to coordinate and control the engine, motor, clutch and AMT gearbox to ...

AI Technical Summary

Problems solved by technology

[0006] This method of resolving the conflict between mode switching and gear shifting by setting priorities does not fundamentally solve the conflict, and there are still hidden dangers

For example, assuming that the priority of gear shifting is high, and the vehicle is in the process of switching from pure electric mode to hybrid mode at a certain moment, if the vehicle needs to change gears at this time, it will suspend the mode switching process and respond to the gear shift command. When the shifting process is over, the mode switching will continue, but at this time the best energy mode of the vehicle may be pure electric, which will cause the vehicle to switch from pure electric mode to hybrid mode and then switch back to pure electric mode. The long-term power interruption caused by the shifting process will not guarantee the power of the vehicle and greatly reduce the economy

Images