Indirect measurement technology of new energy vehicles’ braking force under dynamic braking conditions

Sen-Ming Zhong; Gui-Xiong Liu; Jia-Jian Wu; Bo Zeng

doi:10.1007/s40436-019-00278-x

Advances in Manufacturing ›› 2019, Vol. 7 ›› Issue (4) : 389 -400. DOI: 10.1007/s40436-019-00278-x

Article

Indirect measurement technology of new energy vehicles’ braking force under dynamic braking conditions

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¹ School of Mechanical and Automotive Engineering, South China University of Technology, 510640, Guangzhou, People’s Republic of China

² State Key Laboratory of Environmental Adaptability for Industrial Products, 510663, Guangzhou, People’s Republic of China

^b megxliu@scut.edu.cn

Sen-Ming Zhong is now studying for his Ph.D at South China University of Technology, China. His B.S. degree is in Mechanical Engineering, and his Ph.D is in Intelligent Detection. His current research interest is in Optical-Electromechanical Information Integration and Equipment.

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Gui-Xiong Liu received his B.S. and Ph.D (1995) degrees from Chongqing University, China. His B.S. degree is in Optical Machine Precision Instrument, and his Ph.D degree is in Precision Instrument and Machinery. He is now a university professor of the School of Mechanical and Automotive Engineering. His current research interest is in Precision Testing and Intelligent Instrumentation.

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Jia-Jian Wu received his M.S. (2019) degree from South China University of Technology, China. His B.S. degree is in Measurement and Control Technology and Instrumentation, and his M.S. degree is in Instrument and Meter Engineering.

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Bo Zeng received his M.S. (2015) degree from South China University of Technology, China. His M.S. degree is in Instrument and Meter Engineering. He is now a manager of the State Key Laboratory of Environmental Adaptability for Industrial Products, China.

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Abstract

Currently, direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles. Thus, in this paper, an indirect measurement method of new-energy vehicles’ braking force under dynamic braking conditions is proposed. The mechanical wheel and axle model at low/idling/high speeds is established using the piston-pressure formula, force transfer in the brake-wheel cylinder, relative movement between the wheel and the roller, among others. On this basis, the relationship between wheel braking force and roller-linear acceleration is further derived. Our method does not alter existing vehicle structures or sensor types. The standard sealing bolt is temporarily replaced with a hydraulic sensor for coefficient calibration. Afterward, the braking force can be indirectly calculated using the roller-linear velocity data. The method has characteristics of efficiency and high accuracy without refitting vehicles.

Keywords

Braking force / Indirect measurement technology / Vehicles / Dynamic braking condition / Electromagnetic interference (EMI) test

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Sen-Ming Zhong,Gui-Xiong Liu,Jia-Jian Wu,Bo Zeng. Indirect measurement technology of new energy vehicles’ braking force under dynamic braking conditions. Advances in Manufacturing, 2019, 7(4): 389-400 DOI:10.1007/s40436-019-00278-x