Energy management method for power semi-following type fuel cell hybrid electric vehicle

Abstract

The invention provides an energy management method for a power semi-following type fuel cell hybrid electric vehicle, which comprises the following steps that: when the charge capacity of a power cell is smaller than a first set threshold value Sb, a vehicle control unit sends a starting signal to a fuel cell, and the fuel cell is started; when the charge capacity of the power battery is larger than or equal to a second set threshold value Se, Se is larger than Sb, the vehicle control unit sends a shutdown signal to the fuel cell, and the fuel cell is shut down; if the current electric power of the motor is greater than the current charge capacity compensation power of the power battery, the value of the output power of the fuel cell is the current electric power of the motor; if the current electric power of the motor is smaller than or equal to the current charge capacity compensation power of the power battery, the value of the output power of the fuel battery is the current charge capacity compensation power of the power battery. The method is simple and feasible, the power battery can be controlled to work in a small charge capacity range, and the service life of the power battery is prolonged.

Description

technical field [0001] The invention relates to an energy management method for a power semi-following type fuel cell hybrid electric vehicle. Background technique [0002] In a fuel cell hybrid electric vehicle, the vehicle controller manages the energy of the vehicle by controlling the start-stop and output power of the fuel cell. Due to the limitation of the output power of the fuel cell by air compressors and other devices, the load changing speed often cannot directly follow the power changing speed of the vehicle. Therefore, the fuel cell system generally requires parallel energy storage systems (such as power batteries, super capacitors, etc. ) to make up for the rapidly changing power requirements of the vehicle. The traditional fuel cell energy management method is often associated with the power battery. When the power battery charge is low, the vehicle controller controls the fuel cell to start up and output higher power. When the power battery charge is high, th...

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