Fuel cell temperature control method and device

Abstract

The invention discloses a fuel cell temperature control method and device. The control method comprises the steps as follows: detecting the coolant temperature of a coolant at a cooling part inlet ofa fuel cell, calculating the coolant temperature change rate according to the coolant temperature, comparing a preset target temperature change rate curve with the coolant temperature change rate, judging whether the coolant temperature change rate conforms to the closed-loop control condition, if yes, calculating a first duty ratio according to the difference between the target temperature changerate and the coolant temperature change rate, calculating a second duty ratio according to the difference between the target temperature and the coolant temperature, calculating a target duty ratio according to the first duty ratio and the second duty ratio, and adjusting a heat dissipation device according to the target duty ratio. The method has the advantages that the reaction speed is high, the temperature control is accurate, overshoot, oscillation and other phenomena can be avoided, so that the working environment of the fuel cell is more stable, the service life of the fuel cell is prolonged, and the reliability of the fuel battery is improved.

Description

technical field [0001] The present invention relates to a control method and device, in particular to a fuel cell temperature control method and device. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. It has the advantages of high power generation efficiency and low environmental pollution. The conversion efficiency of fuel cell energy can reach 40% to 60%, and the energy that cannot be converted into electrical energy in the electrochemical reaction will be converted into heat and dissipated, which will increase the temperature of the fuel cell system. Therefore, the temperature control system It is an important part of the fuel cell control system. Because the operating conditions of the vehicle and the external environment will have a greater impact on the temperature of the vehicle-mounted fuel cell, and the severe and frequen...

AI Technical Summary

Problems solved by technology

[0003] The existing fuel cell temperature control technology only performs temperature control based on the temperature of the fuel cell, and does not take the change trend of the fuel cell temperature as the basis for temperature control. The disadvantages are low temperature control accuracy, slow response speed, and overshoot, Therefore, using the existing hydrothermal control technology on the fuel cell vehicle cannot guarantee the stability of the fuel cell working environment, which in turn affects the service life and reliability of the vehicle

Images