Research On Key Technologies Of Automotive Combined Instrument

Pointer dashboard has occupied a dominant market position in recent years. For the requirement of smooth running and low noise to stepper motor, manufacturers produce a variety of stepper motor dedicated in the market of automotive instrument cluster. The paper analyzes the structure of SONCEBOZ's 640x series stepper motor, its driving principle, and its control strategy. Alarm in single frequency used in the dashboard is criticized along with the raising user's consumption expectations. The paper describes the operational principle of electromagnetic-type loudspeaker and dynamic loudspeaker used in the dashboard, and designs drive circuit of electromagnetic-type loudspeaker with discharging diode. According to the electrical impedance characteristics of dynamic loudspeaker, the paper designs its drive circuit with parallel resistance and capacitance to improve the distortion due to the increase of impedance with increasing frequency. The paper also designs and implements square waves to make dynamic loudspeaker to sound fading alarm. The paper finally introduces the method of designing square waves fast by existing PC software and microcontroller driving. Because of research on stepper motor micro-stepping driving, improvement of the stepper motor tracking control algorithm, and analyzing fading out alarm synthesis, the paper designs and implements the dashboard of EV. My work includes hardware circuit designing, realization of the overall function, and the rapid testing solutions.Accurate remaining mileage is convenient for driver to charge in time and plan itinerary. By analyzing the SOC estimation methods of batteries and the energy consumption statistics of vehicle, a more precise approach to estimate the remaining mileages of electric vehicle is proposed in this paper. In this approach, Open circuit voltage method and KALMAN filter are combined to estimate battery energy. Statistics of driving characteristics are obtained in the unit of kinematics sequence. According to the principle that battery consumption equals to the driving energy released, estimation result can be calculated fast. Compared to the pre-existing research of adopting the scheduled time, this approach reduces data volume requirements and improves the result accuracy. Simulation in ADVISOR shows that the estimation accuracy is within 5% in the driving cycle with single features, the estimation can fast track real value in the driving cycle with complicated features.Based on improved display technology, upgraded consumer expectations, high-performance automotive SOC with low price, full-blown graphical dashboard will be applied gradually in the further. Because of the requirement of safety, credibility, developing graphical interface fast, the paper designs the full-blown graphical dashboard based on QNX OS platform and TI AM3517 hardware platform. The hardware circuit contains a core board and a module board. The core board contains AM3517 microprocessor, NAND Flash and DDR2 SDRAM as the module board contains CAN transceiver module, LCD module and other functions. In terms of software the paper describes the developing work based on QNX CAR, including software architecture, the composition and design steps of graphical interface, etc.