Power generation control method and system of hybrid vehicle

Abstract

The invention provides a power generation control method and system of a hybrid vehicle. The method includes the following steps that a SOC value of a power battery of the hybrid vehicle is detcted; the SOC value is compared with a preset power threshold, and an idling power generation mode is entered when the SOC value is less than or equal to the preset power threshold; in the idling power generation mode, an engine of the hybrid vehicle generates electricity to charge the power battery, so that high-voltage accessories of the hybrid vehicle is supplied with the electricity by charging the power battery; and the generation power level of the engine is adjusted according to the power of the high-voltage accessories, and each generation power level corresponds to preset generation power. According to the power generation control method and system of the hybrid vehicle, the generation power level of the engine is adjusted according to the power of the high-voltage accessories, so that the power demand of the high-voltage accessories can be met, and the power battery can be charged; and the battery capacity problem under the idling condition is considered, the power consumption of the high-voltage accessories is considered, and the control accuracy under the condition is improved.

Description

technical field [0001] The present invention relates to the technical field of engine power generation of a hybrid vehicle, in particular to a power generation control method and system for a hybrid vehicle. Background technique [0002] When the power battery of a hybrid vehicle is low and the vehicle is in P or N gear, the power battery is at risk of over-discharge. In order to prevent the power battery from being over-discharged, the engine is usually started to charge the power battery, that is, idling to generate electricity. [0003] In the prior art, the engine will use a unified power to generate power during the power generation process, or perform power generation classification. However, the method of generating electricity with a unified power will lead to waste of energy when the power is low and high power, and the engine will be overheated and the power battery will be overcharged due to the large generated power. The method of dividing the power generation ...

AI Technical Summary

Problems solved by technology

However, the way of generating electricity with uniform power will lead to energy waste when the demand is low and high power, and it will cause overheating of the engine and overcharging of the power battery due to the large power generation

The way to divide the power generation level takes more factors such as battery voltage, vehicle speed, and accelerator pedal opening into account. There is a dilemma that the system is huge and the algorithm is complex, which makes it difficult to implement, and the control accuracy under a single working condition is not high. Unable to achieve stable control of the engine

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