Cold start control method, device, medium, vehicle control unit and system

Abstract

The invention relates to a cold start control method and device, a medium, a vehicle control unit and a system. The method comprises the steps of obtaining an engine starting instruction; controlling a battery relay to be closed in response to the starting instruction; if the temperature of the power battery is smaller than the preset temperature threshold value, the starting power of the generator and the available discharging power of the power battery are obtained; and if the starting power is greater than the available discharge power and the difference between the starting power and the output power of the power battery is less than or equal to the output power of the bidirectional DC / DC converter, controlling the bidirectional DC / DC converter to reversely boost, and controlling the generator to start the engine by using the electric energy provided by the low-voltage storage battery and the power battery. Therefore, normal starting of the engine can be guaranteed, the problem that the engine cannot be started due to performance reduction or insufficient power of the starter in a low-temperature environment is solved, and vehicle using experience is improved. The engine is started by the generator, so that the starting smoothness of the engine can be obviously improved.

Description

technical field [0001] The present disclosure relates to the field of vehicle control, in particular, to a cold start control method, device, medium, vehicle controller and system. Background technique [0002] With the increasing shortage of traditional energy and the increasing environmental pollution, new energy vehicles are becoming more and more popular, among which vehicles equipped with hybrid power systems have been widely used. At this stage, for vehicles equipped with hybrid power systems, when the temperature of the power battery is higher than -10°C, a generator (for example, a belt-driven starter generator (Belt-Driven Starter Generator, BSG) that uses belt drive to both start and generate electricity) is used to start For the engine, when the temperature of the power battery is lower than -10°C, the starter uses the electric energy provided by the low-voltage battery (for example, a 12V battery) to start the engine. However, when the temperature of the power b...

AI Technical Summary

Problems solved by technology

However, when the temperature of the power battery is lower than -10°C and the starter is used to start the engine: due to the low ambient temperature, the performance of the starter may be affected by the temperature and the performance may decrease, which may cause the engine to fail to start; When the low-voltage battery powered by the starter is low, the engine will not start, which will affect the car experience

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