Fuel cell cold starting system and method and vehicle

Abstract

The invention discloses a fuel cell cold starting system and method and a vehicle, the system comprises an electric control unit and a cold starting subsystem, the cold starting subsystem comprises an electric pile, a back pressure valve, a mixed discharging device, a three-way valve, an air filter, an air compressor and an intercooler, the air filter, the air compressor and the intercooler are connected in sequence, and an outlet of the intercooler is communicated with an inlet of the electric pile; an outlet of the electric pile is communicated with an inlet of the back pressure valve; wherein the three-way valve is arranged on a connecting pipeline of the air compressor and the intercooler, a first outlet of the three-way valve is communicated with an inlet of the intercooler, a second outlet of the three-way valve is communicated with an inlet of the back pressure valve, and an outlet of the back pressure valve is communicated with an inlet of the mixed discharging device; the electric control unit is electrically connected with the three-way valve and used for controlling the first outlet of the three-way valve to be cut off and the second outlet of the three-way valve to circulate, so that high-temperature air compressed and discharged by the air compressor enters the back pressure valve through the second outlet of the three-way valve. The system can effectively reduce water residue in the back pressure valve and prevent the back pressure valve from freezing when the fuel cell system is in cold start.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a fuel cell cold start system, method and vehicle. Background technique [0002] Vehicle fuel cell systems generally use proton exchange membrane fuel cells, which generate electricity through the chemical reaction of hydrogen and oxygen in the air, and the reaction product is water. Appropriate ventilation pressure, temperature, and humidity will give full play to the optimal performance of the fuel cell system, and the air pressure is mainly realized by adjusting the opening of the back pressure valve. However, during the cold start process of the fuel cell, due to the low temperature, the pressure valve freezes and cannot adjust the opening. When the fuel cell controller receives the back pressure valve freezing and cannot work normally, it issues an instruction to prohibit the air compressor from starting, resulting in fuel The battery cannot complete a cold star...

AI Technical Summary

Problems solved by technology

In this way, in the low temperature state, the pressured valve itself has insufficient ice-breaking ability, and then the ice-breaking fails. The final control strategy causes the air compressor to fail to start, and the fuel cell cold start fails.

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