The Design Of Control System Of Hybrid Electric Bus Based On CAN Bus

The city bus has slow driving speed and stops frequently. Under this kind of condition, the fuel economy and the emission of conventional bus are bad. It has important significance if the fuel economy and emission performance of the city bus can be improved. The hybrid electric vehicle (HEV) is a kind of perfect vehicle that not only can satisfy the request of exhaust and fuel economy, but also has the advantages of electric vehicle and fuel automobile. And the hybrid electric system most suits for the city bus.Therefore, the hybrid electric bus becomes the development hotspot in the automobile field nowadays. CAN bus is recognized as one of the most developmental Fieldbus in the world, and has reliability, good real-time and flexibility performance,while it is widespread tendency that HEV control network adopt CAN bus technique.This paper encloses the type and control of HEV to research, based on the traditional diesel bus DanDong HUANGHAI DD6123S06. It firstly makes sure the series layout pattern of hybrid electric bus drive system, and completes the components'selecting and parameter matching of its power system. Secondly, this paper proposes one kind of control strategy of series hybrid control system for hybrid electric bus. The control strategy is determined according to its targets to stabilize the speed of diesel engine and reduce fuel consumption and emissions.This paper designs the whole network and the application layer program of the control system, carring on reasonable software design to the system, and it proves rationality of design of whole system through the experiment.The CAN bus control system designed by this paper can operate electronic equipments, detect hybrid electric bus major equipments'state, for understanding running state of each equipment,and make driver realizes more effectively real-time control,thereby assuring bus's fuel economy performance ,emission performance and reliability.