Analysis and redesign of an antilock brake system controller

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Analysis and redesign of an antilock brake system controller

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Antilock braking (ABS) systems are a combination of hydromechanical braking components with switching solenoids and relays which operate the brakes in response to wheel and vehicle speed information. The control law which calculates the braking is a complex set of logical rules designed to allow for variations in road conditions and the nonlinear nature of tyre friction characteristics. The piecewise linear action of the actuator components (solenoids and relays) and the logical control rules make it difficult to analyse the dynamical behaviour of an ABS using conventional methods. The paper describes the analysis and subsequent redesign of an ABS using a new method for studying the dynamical behaviour of piecewise linear systems. The method is applied to a conventionally designed ABS controller. Undesirable performance features, not evident from conventional simulation and testing procedure, are found and the controller is redesigned to give a satisfactory dynamical performance.

Inspec keywords: relay control; brakes; road vehicles; piecewise-linear techniques; solenoids; control system synthesis; nonlinear control systems; relays; systems re-engineering; electric actuators; control system analysis

Other keywords: control analysis; control redesign; relays; hydromechanical braking components; road condition variations; nonlinear tyre friction; switching solenoids; piecewise linear action; actuator components; antilock brake system controller

Subjects: Nonlinear control systems; Road-traffic system control; Electric actuators and final control equipment; Control system analysis and synthesis methods

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