Control method and system for starting engine through BSG motor and vehicle

Abstract

The invention provides a control method and system for starting an engine through a BSG motor and a vehicle. The method includes the steps that rotating speeds of an output shaft of the BSG motor are continuously collected so that the rotating speed waveform of the output shaft of the BSG motor can be obtained; the low-frequency part corresponding to the base waveform is filtered out from the rotating speed waveform of the output shaft of the BSG motor so that the rotating speed vibration waveform of the output shaft of the BSG motor can be obtained, wherein the base waveform is the normal rotating speed waveform of the output shaft of the BSG motor; the compensation waveform used for offsetting the rotating speed vibration waveform of the output shaft of the BSG motor is obtained according to the rotating speed vibration waveform of the output shaft of the BSG motor; the compensation torque is obtained according to the compensation waveform; and the output torque of the BSG motor is compensated for according to the compensation torque. By means of the method, the engine can be started through a BSG motor system in all rotating speed sections, and safety is high. Control mode switching of the motor system does not need to be conducted in the start process, and the start time is shortened.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a control method, a system and a vehicle for starting an engine through a BSG motor. Background technique [0002] In recent years, under the environment of global warming, new energy vehicles have emerged as the times require. Hybrid vehicles and pure electric vehicles have the advantages of low pollution and low emissions, and have developed rapidly in recent years. Due to the constraints of inconvenient charging for pure electric vehicles, hybrid vehicles are currently the mainstream of research and development by major car manufacturers. [0003] BSG (Belt Type Starter / Generator, the same below) cars are weak hybrid electric vehicles, which adopt belt-driven integrated starter / generator technology, which can effectively reduce fuel consumption and improve emissions. Compared with traditional vehicles, the structure of this vehicle has less changes, simple control, low cost,...

AI Technical Summary

Problems solved by technology

However, this solution is realized through the speed control of the BSG motor. However, due to the change of the internal load during the engine startup process and the vibration caused by the non-rigid belt drive, it is necessary to perform a large number of different loads and vibrations during the speed control process. Calibration work, the process is cumbersome

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