Shutdown purging system and purging method for vehicle-mounted fuel cell power generation system

Abstract

The invention relates to a shutdown purging system and a purging method for a vehicle-mounted fuel cell power generation system. The system comprises a fuel cell, a vehicle control unit, a fuel cell controller, a power output relay, an air pump, a hydrogen tail exhaust electromagnetic valve, a fuel cell temperature acquisition device and an environmental temperature acquisition device. A control method comprises the step that the fuel cell controller controls the rotating speed of the air pump, the exhaust period of the hydrogen tail exhaust electromagnetic valve and the purging time in the shutdown process according to the temperature of the fuel cell and the environmental temperature. The shutdown purging system and the purging method for the vehicle-mounted fuel cell power generation system have the beneficial effects that the purging process depends on power generated by the fuel cell power generation system and the feed of a storage battery, which is caused by shutdown purging, can be prevented; and the purging is not limited by time, is determined according to the fuel cell and the environment state and is completely carried out by liquid water.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, in particular to a shutdown purge control system and a purge control method for a proton exchange membrane fuel cell power generation system. technical background [0002] In the prior art, the shutdown and purging of the vehicle-mounted fuel cell power generation system is carried out in a fixed way. After receiving the shutdown command of the whole vehicle, the fuel cell relay is cut off, and the battery is used as the main power source for purging. method, the air pump purging rate is fixed, and the exhaust valve discharges at regular intervals. The deficiencies in the prior art are: 1. Since the amount of liquid water inside the fuel cell varies under different ambient temperatures and different fuel cell temperatures, the purging cannot be controlled according to different ambient temperatures and fuel cell temperatures, and the optimum Good purging effect; 2. Purging is c...

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Problems solved by technology

The deficiencies in the prior art are: 1. Since the amount of liquid water inside the fuel cell varies under different ambient temperatures and different fuel cell temperatures, the purging cannot be controlled according to different ambient temperatures and fuel cell temperatures, and the optimum Good purging effect; 2. Purging is carried out when the fuel cell is turned off, and an auxiliary power supply is required to provide purging power. The power of the battery is limited, and generally the maximum is not allowed to exceed 2 minutes. If the purging time is too long, the auxiliary power The power supply cannot meet the consumption demand, and there will be power feeding phenomenon

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