Title: Numerical evaluation of braking feel to design optimal brake-by-wire system

Authors: Shinsuk Park, Sangwoo Bae, Jang Moo Lee

Addresses: Department of Mechanical Engineering, Korea University, 1, 5-ga, Annam-dong, Sungbuk-gu, Seoul 136-701, Korea. ' Manufacturing Equipment R&D Team, Mechatronics Center, Samsung Electronics Co. Ltd, 416 Maetan-3dong Yeongtong-gu, Suwon, Gyoenggi-do 443-742, Korea. ' School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1 Sillim Kwanak, Seoul 151-744, Korea

Abstract: Over the years there have been significant advances in automotive engineering thanks to recent development of electronics. Antilock brake system (ABS) technology with modern electronic components has shown superior braking performance to conventional vehicles on highways. The brake-by-wire (BBW) system equipped with powerful electronic devices also allows us to arbitrarily tailor the force feel at brake pedal. Conventionally, however, the brake system has been developed through trial and error on test tracks, which necessitates a great amount of time and cost. This study attempts to establish an analytical tool to evaluate braking feel to help design optimal brake systems. First, mathematical models of brake systems are developed and are confirmed through computer simulations. Second, mechanical impedance at brake pedal is modelled based on the developed brake system models. The brake pedal feel is represented in the form of impedance surface. Third, to provide a guideline to design optimal braking feel, relations between pedal force, pedal stroke and vehicle deceleration are investigated. An expert test driver|s evaluation process is modelled based on his subjective ratings of brake systems.

Keywords: brake-by-wire; BBW; brake pedal feel; braking feel; vehicle braking; braking analysis; braking evaluation; mathematical modeling; simulation; impedance surface; pedal force; pedal stroke; vehicle deceleration; design optimisation.

DOI: 10.1504/IJVD.2005.006092

International Journal of Vehicle Design, 2005 Vol.37 No.1, pp.1 - 23

Available online: 03 Feb 2005

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