In an introduction, the present paper gives a short survey of existing vehicle-dynamics control systems that is based on some examples and thus does not claim to be complete. There is a tendency towards an increased i...
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In an introduction, the present paper gives a short survey of existing vehicle-dynamics control systems that is based on some examples and thus does not claim to be complete. There is a tendency towards an increased interlinking of these systems and, as a result, a need for flexible automotive testing platforms. As an approach, an electric X-by-wire test vehicle which was designed and mounted for developing and testing new strategies of vehicle-dynamics control is presented. It is built up modularly and provides numerous degrees of freedom that enable a control strategy which is based on an optimization of the tire forces. That strategy is also presented. It takes into account possible actuator breakdowns and uses the redundancy in the vehicle to realize the desired movement even in the case of such a breakdown. An outlook on future possibilities in vehicle-dynamics control resulting from the use of self-optimization is also given.
This paper presents a road condition estimator based on the wheel acceleration and a torque controller for a vehicle equipped with an electric motor. In the first step, the instantaneous friction coefficient and the m...
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ISBN:
(纸本)9788993215038
This paper presents a road condition estimator based on the wheel acceleration and a torque controller for a vehicle equipped with an electric motor. In the first step, the instantaneous friction coefficient and the maximum friction coefficient between the wheel and the road are estimated, without knowing a priori the road conditions. Next, a longitudinal controller is set up to ensure the two main functions : braking with anti-skidding function and traction control using the electric motor torque as a unique actuator. Unlike the torque generated by classic internal combustion engines, the torque of electric motors is available almost instantaneously. In addition, it can be measured on-line which means that advanced control techniques can be applied. The approach presented in this paper relies on recent algebraic techniques for numerical differentiation and diagnosis, and a feedback sliding mode control scheme to ensure the vehicle is operated at the maximum friction zone in both acceleration and braking phases, along with a given reference speed to track.
The paper presents a fully active X-by-wire test vehicle that serves as a basis for developing new design methods and tools to be used in the layout of complex vehicle-dynamics control functions and tested on the vehi...
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The paper presents a fully active X-by-wire test vehicle that serves as a basis for developing new design methods and tools to be used in the layout of complex vehicle-dynamics control functions and tested on the vehicle. In the automotive sector the number and extent of vehicledynamicscontrol functions and electronics are fast increasing, thus improving vehicle-dynamics, ride comfort, and ride safety. The complexity of electronics is marked not only by the number of control units and thus the interconnection of the vehicle-dynamics control systems (ASR, ABS, AFS, ESP) but also by the numerous possibilities of improving vehicledynamics on the physical level (Amm06). Getting a grip on the complexity of interconnection requires a systematic proceeding in the design and layout of vehicle-dynamics control functions. The test vehicle offers the possibility to design different concepts independently of one another and to test additional functions on the vehicle by interconnecting the vehicledynamicscontrol functions for a decisive improvement of ride safety and comfort.
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