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HILS를 이용한 EPS 제어 Logic 의 신뢰성 확보 방안
김정탁(Jungtak Kim),정대종(Daijong Chung),김성규(Seongkyu Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The EPS(Electric Power Steering) system is superior to conventional hydraulic power steering system in the aspect of fuel economy, environmental preservation and assembly convenience and it is foundation for intelligent vehicle such as electric vehicle, active steering and steer by wire.<br/> In this paper, development of EPS control logic with HILS (Hardware In the Loop Simulation) is introduced. EPS and EPS ECU(Electronic Control Unit) work as real hardware and the other parts of vehicle are simulated as mathematical model. HILS oilers circumstances for efficient development of control logic and reliability of EPS. Simulating dangerous test as substitute for vehicle test, diagnosis and fail-safety function can be 0firmed up and the cause of error can be searched definitely owing to revivability of test. In addition, various tests can be taken efficiently with test automation.<br/>
EPS 시스템의 On-center Handling 특성 개선
김성규(Seongkyu Kim),정대종(Daijong Chung),김정탁(Jungtak Kim),최대근(Daegeun Choi) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The EPS system is superior to conventional hydraulic power steering system in the aspect of fuel economy,<br/> environment and assembly convenience but the increase of friction and inertia may cause unnatural steering feeling<br/> especially in on-center range. Therefore, EPS has its own special control logic to compensate it.<br/> In this paper, the study for an objective evaluation method with steering angle, steering torque, lateral acceleration<br/> and yaw rate was addressed to quantify on-center handling of EPS system. Based on this method, the control factors<br/> that affect on-center handling performance was analyzed and test results show that on-center handling can be<br/> improved with adequate returnability control, damping compensation and inertia compensation.