Hybrid Electric Cars With The Brushless Dc Motor Control Dsp-based Research

To save energy sources and protect environment, electric vehicle should be the development direction instead of traditional vehicle. Pure electric vehicle can achieve no exhaust gas and no pollution, but its continuous journey is short due to technical limit of the storage battery. Pure electric vehicle can not be used now. Hybrid electric vehicle (HEV) has motor and gas engine drive. HEV is practical and exigent vehicle owing to its predominant performance, small exhaust gas and pollution.The HEV fix two drive systems in smaller space. Motor drive system is required to not only possess small volume and light weight, but also achieve performance of electromotor and generator. Especially when the HEV applies the brake, in order to energize the storage battery, it is expected that voltage brought by generator is higher than voltage of the storage battery even if speed of generator is slower. At present, this is a new question for discussion and challenge to the HVC.Brushless direct current motor drive system based on DSP in the HVC is researched by digital control manner in the paper. Integrating electromotor and generator, a rare earth permanent magnet brushless direct current motor (REPM BLDCM) control system based on DSP in the HVC is studied. The software control thought achieving performance of electromotor and generator is given on condition that the hardware of control circuit is not changed. It is realized that voltage brought by generator is higher than voltage of the storage battery even though speed of generator is slower. The overall project design, hardware and software design of the control system are presented particularly. The design scheme of the paper is tested and the sample has been manufactured. The satisfactory result is shown by the prototype trials.Afterwards, velocity adjustment control system of REPM BLDCM based on Special Integrated Circuit is researched. The design scheme is tested and the sample has been manufactured. The satisfactory result is shown by the prototype trials. The control system is used mainly in small power accessorial electromotor control.Finally, shortage in project research is analyzed and suggestion is given.