Research On The Driving Control Technology Of Parking Heater’s Permanent Magnet Brushless DC Motor

With the continuous development of the automobile industry,the comfort of the vehicle has become the focus of attention.The parking heaters have come into being and have achieved a good market reaction,which can heat the engine and the cab.As an important actuator,the running state of the brushless DC motor determines the work effect of the whole system.The speed governing performance of the fan motor in the parking heaters directly determines the combustion efficiency inside,and affects the economy of the system and the quality of the exhaust emission.The speed governing performance of the pump motor is closely related to the heat exchange efficiency of the heater.Therefore,the research on the brushless DC motor control system of the parking heaters has very important practical significance and engineering value.According to the performance requirements and technical requirements of parking heater products,a permanent magnet brushless DC motor drive control system based on STM32F103 series chips was designed and developed.The internal structure and working principle of the parkingheater system were introduced.The function of Brushless DC motor in the system was analyzed.The research status and research hotspot in the field of Brushless DC motor control at home and abroad were reviewed.Theoretical research and simulation test of a brushless DC motor drive control algorithm were carried out.The hardware design,software implementation and experimental research of the control algorithm were also carried out.The mathematical model of the brushless DC motor was established.The model was simulated and the working characteristics were analyzed,besides the correctness of the model was verified.According to the actual working conditions and control requirements of fan motor and pump motor in heater,fuzzy PID control algorithm and vector control algorithm of fan motor of parking heater were put forward respectively.According to the working condition of the motor,the simulation study was carried out to verify the control effect of the algorithm.The proposed fuzzy PID algorithm can adjust self adaptively according to the changes of the system parameters and realize the self tuning of the PID control parameters.According to the different conditions of fan motor,the control accuracy and control effect of fuzzy PID algorithm and classical PID algorithm were compared and analyzed,providing theoretical basis for algorithm engineering implementation.Aiming at the characteristics of large load torque and obvious torque ripple of pump motor,the direct relation between current and torque was established by coordinate transformation which improved the the torque control performance of the pump motor.Based on the theoretical research and simulation test of the algorithm,an experimental platform for the permanent magnet brushless DC motor driving control system of the parking heater was built.Combined with actual project needs and previous engineering experience,the controller design of Brushless DC motor drive control system was carried out,and the corresponding protection circuit was designed according to the actual vehicle electrical environment,and verified by experiment.The realization of the single chip computer code of the fuzzy PID algorithm was completed.The actual control effect of the control system under various working conditions was extracted and observed through the design of the host computer monitoring software.The experimental results showed that the developed controller satisfied the requirements of motor response speed,overshoot and steady-state error,and the motor responded quickly to the torque ripple and meets the functional requirements of the product...