Hybrid electric vehicle fuel cell thermal management system and control method thereof

Abstract

The invention discloses a hybrid electric vehicle fuel cell thermal management system. The system is characterized in that the system comprises a fuel cell water loop, a PTC heating water loop, an airconditioning refrigeration system and a passenger compartment air inlet channel; and the fuel cell water loop and the PTC heating water loop exchange heat through an intermediate heat exchanger, andthe passenger compartment air inlet channel exchanges heat with the PTC heating water loop and the air conditioning refrigeration system. The invention further provides a control method of the hybridelectric vehicle fuel cell thermal management system. The control method comprises a fuel cell cold start mode and a fuel cell waste heat recovery mode. When a fuel cell is subjected to cold start andan environment temperature is relatively low, the PTC heating water loop can heat the fuel cell and a passenger compartment at the same time; and when the temperature of the fuel cell is too high, waste heat recovery is performed through the PTC heating water loop, the PTC heating water loop and the PTC heater heat the passenger compartment together, an energy utilization rate of the fuel cell isincreased, and the passenger compartment can be heated while cold start of the fuel cell is guaranteed.

Description

technical field [0001] The invention relates to the technical field of fuel cell heat management, in particular to a hybrid electric vehicle fuel cell heat management system and a control method thereof. Background technique [0002] Temperature is one of the necessary parameters for the fuel cell system to work at the best performance. The best operating temperature of the fuel cell system is between 55 and 70°C, which can reach the rated power. However, in a low-temperature environment, it takes a long time for the fuel cell to achieve the best performance, which leads to a long time for the fuel cell system to start, which increases the degree of passenger complaints about the vehicle; moreover, the heating of the passenger compartment is slow, which greatly Affects the ride comfort of the driver and his passengers. Moreover, when the fuel cell works in a low-temperature environment, water will be generated, which will damage the proton exchange membrane structure inside...

AI Technical Summary

Problems solved by technology

However, in a low-temperature environment, it takes a long time for the fuel cell to achieve the best performance, which leads to a long time for the fuel cell system to start, which increases the degree of passenger complaints about the vehicle; moreover, the heating of the passenger compartment is slow, which greatly Affects the ride comfort of the driver and his passengers

Moreover, when the fuel cell works in a low temperature environment, water will be generated, which will damage the proton exchange membrane structure inside the fuel cell.

At the same time, the activity of the catalyst is reduced, which seriously affects the catalytic effect, reduces the reaction rate, and affects the performance of the fuel cell.

[0003] When the ambient temperature is low, it is necessary to meet the comfort requirements of the driver and passengers in the passenger compartment. Usually, PTC components are used for the heating of the passenger compartment. This component has a large power, which increases the amount of hydrogen and reduces the Vehicle mileage

[0004] In addition, when the fuel cell vehicle is working, the fuel cell stack will generate a lot of heat. The existing method uses less of this part of heat energy, but uses the coolant to take away the excess heat, which can only be wasted in vain to keep the fuel. Battery stack at normal operating temperature

[0005] Chinese patent 201410093593.0 discloses a fuel cell cold start rapid heating system and method, which only describes the cold start rapid heating, while Chinese patent 201610878789.X discloses a fuel cell waste heat utilization system and control method, which describes the fuel cell Battery waste heat utilization, but no patent has fully considered the cold start and waste heat utilization of fuel cell hybrid vehicles

Images