Hybrid power system for automobile driven by fuel cell

Abstract

The invention discloses a fuel battery automobile mixing power system, which comprises the fuel-battery sub-system, the accumulator branch system, the power diode, the bidirectional DC / DC converter, the 24VDC / DC converter and the electric machine controller. The fuel battery connects to the electric machine controller through the power diode linking to the bidirectional DC / DC converter, the accumulator group paralleled connects in front of the electric machine controller, and the input terminals of the bidirectional DC / DC converter paralleling connect the assistant equipment of the fuel battery and the 24VDC / DC converter. At the beginning of the startup of the whole system, the fuel battery system will not start immediately, and the accumulator system provides the power for the system, and when the fuel battery system is started and works normally it provides the power for the whole power system. The invention reduces the power volume of DC / DC converter and the design size, improves the reliability of the operation of the whole power system and the efficiency of the system running.

Description

technical field [0001] The invention relates to a fuel cell vehicle hybrid power system, belonging to the field of fuel cell vehicle power system development. Background technique [0002] Fuel cell vehicle is a new energy vehicle. Compared with traditional internal combustion engine vehicles, it has excellent working performance of energy saving, environmental protection and quiet operation, which has become a hot spot in the current new generation of vehicle research and development technology. The national "Tenth Five-Year Plan" 863 major project for electric vehicles has set up sub-projects for fuel cell cars and fuel cell city buses. The research and development of fuel cell vehicles has become a major measure to promote the leapfrog development of my country's automobile industry. The integration technology of fuel cell hybrid power system is one of the key technologies in the field of fuel cell vehicle research and development. [0003] The power system of fuel cell ...

AI Technical Summary

Problems solved by technology

As a result, the above-mentioned power system structure has the following problem: the power required by the fuel cell auxiliary equipment actually flows out from the fuel cell system (fuel cell stack) and undergoes a unidirectional boost DC / DC conversion. After the reactor, it flows back to the fuel cell system (fuel cell auxiliary equipment)

However, changing the system connection method in this way will cause difficulty in starting the system, because at the beginning of the system starting, the auxiliary equipment has no way to get the necessary power supply, and the fuel cell system cannot start.

Images