A kind of fuel cell thermal management control method

Abstract

The invention discloses an efficient fuel cell thermal management control method. In step 1, in the start-up stage, a small-cycle heating circuit is opened, and the optimal temperature rise curve given by the stack is followed to control the small-cycle heating stack to make the stack temperature Follow the given optimal temperature rise curve to reduce the start-up time of the stack; Step 2, in the heating stage, collect the water inlet temperature and water outlet temperature of the stack, and obtain the speed request of the circulating water pump and the opening of the three-way valve through table look-up and calculation. In step 3, when the temperature of the stack exceeds the set temperature, the power generated by the stack is limited according to the collected actual temperature of the circulating water entering the stack, so that the power of the stack can be reduced. The power does not exceed the power corresponding to the current maximum heat dissipation capacity, and with the control of the opening of the three-way valve, the cooling water heat dissipation rate request and the target water pump speed, the operating temperature of the stack is maintained within the set range, reducing the thermal runaway of the stack. risk.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a thermal management control method for fuel cells. Background technique [0002] In the current era of rapid consumption of fossil energy, the search for alternative renewable clean energy has become a major issue for sustainable development, and hydrogen energy, as a renewable clean energy, has received more and more attention. As an electrochemical device, a fuel cell can directly convert the chemical energy in hydrogen into electrical energy, without the combustion process of a traditional internal combustion engine, the energy conversion process is simpler, and is not limited by the Carnot cycle, with high efficiency, no pollution, Advantages such as excellent NVH performance are considered to be the future of the automotive industry. However, during the normal operation of the fuel cell, the heat released by the stack reaction accounts for about 30% to 60% of the total energy, an...

AI Technical Summary

Problems solved by technology

Excessive start-up times, especially cold starts, lead to increased hydrogen consumption

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