A cold start system and its control method

Abstract

The invention discloses a cold start system, comprising a fuel reactor, a fuel supply pipeline, an oxidant supply pipeline, a temperature sensor and a controller; the fuel supply pipeline is used to deliver fuel to the fuel reactor the anode of the oxidant supply line for delivering oxidant to the cathode of the fuel reactor stack, the oxidant supply line includes an injector for injecting oxidant into the fuel reactor stack during cold start the cathode of the fuel reactor; the temperature sensor is used to detect the temperature information of the fuel reactor, and transmit the temperature information to the controller; the injector and the temperature sensor are connected to the controller in communication; The invention also provides a method for implementing the cold start system. The invention reduces the efficiency of the fuel cell by reducing the concentration of the oxidant, thereby increasing the heat production, and also improving the uniformity of the oxidant inside the stack, thereby improving the overall performance of the vehicle. performance.

Description

technical field [0001] The invention relates to the field of fuel cell control, in particular to a cold start system and a control method thereof. Background technique [0002] In recent years, new energy vehicles are attracting everyone's attention, and fuel cell vehicles have gradually received more and more attention. The fuel cell system includes a fuel cell stack, in which the reaction gas undergoes an electrochemical reaction to generate electric energy; and a reaction gas supply device, which supplies the fuel cell stack with the reaction gas through a reaction gas flow path. [0003] The fuel stack is a stack structure obtained by stacking hundreds of single cells, and the single cell is composed of a pair of bipolar plates sandwiching the membrane electrode MEA. The membrane electrode structure is composed of positive and negative electrodes and a polymer electrolyte membrane in the middle. [0004] When hydrogen as a fuel gas is supplied to the anode electrode of...

AI Technical Summary

Problems solved by technology

[0007] In the patent US6764780B2, the method of running the fuel cell under oxygen-deficient loading is adopted. This method increases the temperature of the fuel cell by increasing the internal resistance of the fuel cell. Although this method is simple, it is difficult to control because the flow rate of the oxidant and fuel is too low, which is easy to cause the fuel cell The problem of voltage reversal, and it is easy to cause permanent burnout of the membrane electrode due to improper loading

Patent CN201320253808.1 adopts the method of inserting a heating plate inside the fuel cell. Although this method is convenient for control, it is very easy to cause a short circuit, and this method needs to process a special installation groove for installing the membrane electrode, which may easily lead to leakage of the stack

Images