BSG motor start stop control method and system

Abstract

The invention provides a BSG motor start stop control method and system; the method comprises the following steps: a vehicle controller receives a vehicle startup signal, and obtains a terminal voltage of a first battery and a terminal voltage of a BSG motor; if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is greater thana first set value, the vehicle controller controls a DCDC controller to invert and boost the voltage outputted by a second battery, thus increasing the terminal voltage of the BSG motor, and limitinga terminal current to be smaller than a startup current threshold; if the voltage difference value is smaller than a second set value, the vehicle controller controls a high voltage contactor to close, thus enabling the first battery to power up the BSG motor via the high voltage contactor, wherein the second set value is smaller than the first set value; the vehicle controller sends a motor startup signal to the BSG motor, the BSG motor starts up, and drives the vehicle engine to rotate via a belt. The method and system can improve the vehicle safety.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a start-stop control method and system for a BSG motor of a micro-hybrid vehicle. Background technique [0002] With the increasingly stringent requirements of the country on fuel consumption, in cities, due to the concentration of population and vehicles, the operating conditions of urban vehicles are special, especially for urban buses, where there are many stops, plus Stopping at a red light at a traffic crossing, starting and stopping are very frequent, causing most of the energy generated by the engine to be consumed in the form of friction and heat during braking. And because there is a long-term parking condition, the engine is in an idle state for a long time, causing problems such as low vehicle speed, high fuel consumption, and serious pollution. At present, hybrid electric vehicles can reduce fuel consumption and emissions. It adopts hybrid technology, whi...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a start-stop control method and system of a BSG motor, which solves the problem that when the current connection between the BSG motor and the power storage battery is started and stopped, due to the voltage difference between the two ends of the contactor, a large current is formed at the moment of closing to cause an impact on the load or generate sparks problems, can improve the vehicle safety and electrical safety

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