Fuel cell control method and system under low temperature condition

Abstract

The invention discloses a fuel cell control method under a low temperature condition. The method comprises the following steps: acquiring the temperature, SOP and SOC of a power cell; judging the temperature range of the power battery, the SOC and the current allowable SOP, and controlling the fuel battery to start and the power battery to heat; when the temperature of the power battery is lower than a set threshold value or the SOC is smaller than a set threshold value, starting the fuel battery; and controlling the output power of the fuel cell according to the allowable power of the power cell, the power required for heating and the minimum energy consumption power of the vehicle, reducing the capacity of the power cell in a low-temperature environment, not allowing charging, and when the available power of the power cell is limited, preforming comprehensive distribution, and respectively controlling the heating time sequence and limiting the output power of the fuel cell system. The dual-power system is accelerated to quickly enter a normal working state, so that the electric quantity of the power battery can be recovered to a normal control range, the condition of over-discharge is avoided, and the dynamic property of the vehicle is gradually recovered to be normal.

Description

technical field [0001] The invention belongs to the technical field of fuel cell systems of fuel cell vehicles, and in particular relates to a fuel cell control method and system under low temperature conditions. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy into electrical energy without combustion. It can be used as a stationary power station or as a mobile power supply. As a vehicle power supply, the fuel is generally H 2 , the oxidizing agent is generally air. Although the fuel cell system has the advantages of fast fuel loading, long cruising range, and no pollution. [0003] However, hydrogen-fueled new energy vehicles are limited by the ambient temperature when operating in a low-temperature environment. In a low temperature environment, the available power of the power battery is the only source of power for the vehicle. The available power of the power battery is limited in a low temperature environme...

AI Technical Summary

Problems solved by technology

[0006]Aiming at the start-up problem of fuel cells in low-temperature environments, solve the low-temperature start-up strategy for power batteries and fuel cells, and avoid the rapid reduction of power battery power when starting at the same time, resulting in over-discharge etc., the object of the present invention is to provide a fuel cell control method and system under low temperature conditions, the capacity of the power battery is reduced in low temperature environment, and charging is not allowed, and the comprehensive distribution is carried out when the available power of the power battery is limited , respectively control the heating sequence and limit the output power of the fuel cell system

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