Automobile EPS temperature observation method based on extended state observer |
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| Institution: | 1. School of Mechanical Engineering, Harbin Institute of Technology, 150001 Harbin, China;2. School of Engineering and Applied Sciences, McMaster University, L8S 1A9 Hamilton, Canada;1. Dipartimento di Ingegneria Elettrica Elettronica e Informatica, Università degli Studi di Catania, Viale A. Doria 6, Catania, Italy;2. Dipartimento di Ingegneria, Università degli Studi di Messina, Contrada Di Dio, Messina, Italy;1. Center for Control Theory and Guidance Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;2. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610097, Sichuan, China;1. College of Engineering, Bohai University, Jinzhou 121013, China;2. Research Institute of Intelligent Control and Systems, Harbin Institute of Technology, Harbin 150001, China;3. Research Institute of Intelligent Control and Systems, Harbin Institute of Technology, Harbin 150001, China;4. Department of Mechanical Engineering, University of Victoria, Victoria V8W 2Y2, BC, Canada |
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| Abstract: | The swing temperature usually leads to the parameter drift and even failure in Electric power steering (EPS), which is a potential threat for safe driving of automobiles. Power Metal-Oxide-Semiconductor Field Effect Transistors (MOSFET) are a primary heat source in EPS and, therefore, can directly represent the temperature fluctuation of EPS. Existing technologies that observe the temperatures of MOSFETs are restricted by operating conditions, cost and implementation difficulty for application in automotive EPS systems. To address this issue, a novel real-time junction temperature observation method is proposed by combining a Foster network with an Extended State Observer (ESO) technique. Transfer paths of thermal resistance in EPS converters are analyzed, and the thermal state space model is established by the Foster network. The temperature ESO of the EPS controller is then developed based on this thermal model to estimate the temperature and perturbation. Confirmation tests that introduce a simulated driving steering method measure the MOSFET temperature and verify the validity of the temperature ESO. The test results demonstrate that the proposed temperature ESO can be used to monitor junction temperatures of MOSFETs in EPS. |
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