Extended range type electric vehicle power system based on fuel battery and control method for extended range type electric vehicle power system

Abstract

The invention discloses an extended range type electric vehicle power system based on a fuel battery and a control method for the extended range type electric vehicle power system. The output end of a fuel battery system with a hydrogen pot is connected with an input of a direct current/direct current (DC/DC) transformer through a controllable relay S1; an output of the DC/DC transformer is connected with a lithium iron phosphate power battery pack; the lithium iron phosphate power battery pack is connected with the high voltage input end of a motor controller; the three-phase output end of the motor controller is connected with a driving motor; a whole vehicle controller VMS directly controls an electromagnetic valve for managing hydrogen output and the relay S1 through an input/output (I/O) port, and communicates with the fuel battery system, the DC/DC transformer, a battery management system and the motor controller through controller area network (CAN) buses so as to control a motor to drive the whole vehicle to run and manage the whole power system. The fuel battery system with the hydrogen pot is used as a vehicle-mounted charger for the lithium iron phosphate power battery pack; and a scheme of a vehicle-mounted range extender of an electric vehicle can be provided. The efficiency of the fuel battery system serving as the vehicle-mounted range extender is higher than that of an internal combustion engine; furthermore, the noise is low, and zero emission and zero pollution are realized.

Description

technical field [0001] The invention belongs to the field of new energy electric vehicles, and relates to a power system of an extended-range electric vehicle, and furthermore relates to a power system and a control method of an extended-range electric vehicle based on a fuel cell. Background technique [0002] New energy electric vehicles have the advantages of energy saving and environmental protection, and are becoming a hot spot in the research and development of new-generation vehicles. In recent years, electric vehicle technology has made significant progress. However, there are still technical challenges in the process of R&D and industrialization promotion, such as short life of power batteries, long charging time, and low energy density, which lead to the mileage of the vehicle after one charge. Short and other issues. [0003] Due to the short mileage after a single charge of pure electric vehicles, the range-extended electric vehicles emerged as the times require...

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Problems solved by technology

[0004] However, the working fuel of the internal combustion engine still uses non-renewable energy such as gasoline or diesel, and the energy conversion efficiency is less than 30%, and it emits pollutants such as CO, CO2, sulfide, and nitrogen oxides. Does not meet, so fuel cell electric vehicles with higher driving range are born

However, the power system of fuel cell electric vehicles generally uses proton exchange membrane fuel cells as the main energy source of the vehicle, while the power battery is the auxiliary energy source, which is only used to provide auxiliary power when the vehicle is started and accelerated to climb. In this way, the output power of the fuel cell system Vehicle operating conditions change dynamically, and the life and durability of fuel cell systems are not good under such dynamic conditions, and the cost of high-power fuel cell systems is much higher than that of power batteries. These two points make it difficult to effectively promote fuel cell electric vehicles

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