Fault diagnosis method of bottle valve in fuel cell hydrogen system

Abstract

The invention provides a method for diagnosing the failure of a bottle mouth valve in a hydrogen system of a fuel cell, comprising: acquiring the air pressure of each hydrogen bottle, and recording the air pressure of each hydrogen bottle as P1, P2, ... Pn according to the pressure of each hydrogen bottle from small to large. The number s of the currently opened hydrogen bottle is set to 1; detect the pressure Pg in the hydrogen supply pipeline; judge whether PG is less than or equal to Ps‑ΔP, if "Yes", calculate or look up the hydrogen with the number s according to Pg and Ps The pressure value Px after the bottle and the pressure in the hydrogen supply pipeline is stable and the time required for the pressure in the hydrogen supply pipeline to rise from Pg to Px Trise; open the hydrogen bottle numbered s; when the hydrogen bottle numbered s When the opening time is greater than the preset time Ts, detect the pressure Pm in the hydrogen supply pipeline and judge whether Px‑Pm is greater than the preset error value Pa, if "Yes", it will prompt that the bottle mouth valve of the hydrogen bottle labeled s is faulty . The advantage of this method is that it ensures that the pressure shock of the hydrogen supply pipeline of the hydrogen system is minimal and quickly diagnoses all faulty hydrogen cylinder bottle mouth valves.

Description

technical field [0001] The invention relates to the field of fuel cell vehicle control, in particular to a method for diagnosing a fault of a bottle valve of a fuel cell hydrogen system. Background technique [0002] Hydrogen fuel cell vehicle technology is becoming more and more mature. As a zero-pollution, zero-emission new energy vehicle, hydrogen fuel cell vehicles have increasingly entered the transportation system and have been widely recognized by the public. Fuel cell vehicles use hydrogen as fuel, and through fuel engines, chemical energy is efficiently converted into electrical energy to drive the vehicle. The whole process only discharges pure water, so it is the most ideal energy-saving, environmentally friendly, and zero-emission replacement for traditional fossil fuel vehicles in the near future. Transportation. Hydrogen is the flammable gas with the highest energy density under normal temperature and pressure. It can burn or even explode when the volume fract...

AI Technical Summary

Problems solved by technology

[0005] The shortcoming of these prior art is: 1, for the fuel cell system that the quantity of hydrogen cylinder is many, such as the quantity of the hydrogen cylinder of fuel cell heavy-duty truck and bus can reach 8 or more, existing technology completes all hydrogen cylinders It takes a very long time to determine the failure state of the mouth valve, especially when only the last hydrogen bottle mouth valve to be detected is faulty; 2. For fuel cell systems with a large number of hydrogen bottles, such as fuel cell heavy trucks and The number of hydrogen cylinders in a bus will reach 8 or more. When the bottleneck valves of multiple hydrogen cylinders are faulty, it is difficult to quickly diagnose all the failed hydrogen cylinder bottleneck valves in the existing technology diagnosis, increasing the system Maintenance and overhaul time; 3. Each fault detection in the existing technology adopts the method of opening multiple hydrogen cylinder bottle mouth valves at the same time. The number of mouth valves is positively correlated

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