Fault diagnosis method for fuel cell system

Abstract

The invention provides a fault diagnosis method for a fuel cell system. The fault diagnosis method comprises the steps of executing offline processing and executing on-line processing; the off-line processing is used for establishing a fault database according to operation and fault data of a fuel cell, collected by a plurality of sensors and calculating a fault threshold value; and the on-line processing is used for identifying the type of a fault according to the fault database and the fault threshold value, judging the type of the fault according to the fault database, if the fault is reversible and a fault component is a non-core component, reconstructing a sensor signal corresponding to the fault component to enable the fuel cell system to continue running, and if the fault is irreversible or the fault component is a core component, shutting down and maintaining the fuel cell system. The method has the advantages that signal authenticity verification, fault diagnosis, fault positioning and fault-tolerant control are realized, and signal reconstruction is realized through an algorithm to maintain power output in a fault state, so that the safety and reliability of the fuel cellsystem for a vehicle are ensured; and the method can be suitable for different fuel cell systems.

Description

technical field [0001] The invention relates to a fault diagnosis method, in particular to a fuel cell system fault diagnosis method. Background technique [0002] Hydrogen fuel cell vehicle technology is becoming more and more mature. As a new energy vehicle with zero pollution and zero emissions, 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 the fuel engine, 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 vehicle to replace traditional fossil fuel vehicles in the near future Transportation. [0003] In vehicle (passenger cars, passenger cars, buses, etc.) Limp to destination or repair. [0004] Most of the existing technologies carry out fault diagnosis through the fault phen...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing technologies carry out fault diagnosis through the fault phenomenon, and it is impossible to specifically identify the different fault causes behind the fault phenomenon. After the fault is confirmed, measures such as switching the power source and shutting down are generally adopted, which cannot guarantee the reliability of the vehicle power supply.

At the same time, most of the existing technologies focus on the part of the fault diagnosis process, and seldom consider the complete process of signal authenticity verification, fault diagnosis, fault identification, fault location, signal reconstruction and fault-tolerant control

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