Method for controlling output power of vehicular fuel cell system

Abstract

Disclosed is an output power control method for a fuel cell system of a vehicle belonging to fuel cell automobile research and development technology field. A vehicle controller can compute a target torque of a motor according to a driver's intentions (such as key signal, accelerator pedal signal, brake pedal signal, gearshift signal), compute the motor power demand according to the motor rotation speed, and obtain a target output power of the fuel cell system according to the motor power demand and work state signals of the cell; then the vehicle controller can obtain a target input voltage of a DC / DC transformer according to the relationship between the fuel cell output power and output voltage, and send the instruction to the DC / DC transformer. The DC / DC transformer can perform PI closed loop control according to the target input voltage and actual output current, so as to realize direct control on the output power of the fuel cell system. The invention has high control precision, high response speed.

Description

technical field [0001] The invention relates to a method for controlling the output power of a vehicle fuel cell system, and belongs to the technical field of research and development of fuel cell vehicles. Background technique [0002] Since fuel cell vehicles have excellent performances such as low noise, high efficiency and zero emissions, they are widely considered to be the development trend of the future automobile industry. Automobile research and development has become a major measure to promote the leapfrog development of my country's automobile industry. The technology related to fuel cell vehicle power system is one of the key technologies in the field of fuel cell vehicle research and development. [0003] Fuel cell power system is the core part of fuel cell vehicles, the key to determine the performance of fuel cell vehicles, and also an important symbol of its difference from traditional internal combustion engine vehicles, battery electric vehicles and gasolin...

AI Technical Summary

Problems solved by technology

In this control method, the control response time is slower than the previous method, which can reach tens of milliseconds to hundreds of milliseconds; but the control accuracy is high. Through control, the difference between the actual output power of the fuel cell system and the target output power Between hundreds of watts and thousands of watts; neither control method provides direct control over the output power of the fuel cell system

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