Abstract
ESP can help the road vehicle to improve driving dynamics and prevent accidents which result from loss of control. Based on the theory and account method of Multi-body System Dynamics, the Multi-body System Dynamics model of an A-class car is built by the ADAMS/Car software, which includes steering system, front and rear suspension, braking system, body, and so on. In order to study the handling stability of vehicle with ESP control system, the vehicle yaw rate is set as the controlling aim, to build the fuzzy controller of ESP. The performance evaluation methods of vehicle with ESP are proposed to evaluate the handling stability of vehicle with ESP. The results show that the vehicle with ESP can keep the right path, the yaw rate and the vehicle slip angle is all controlled better. The handling stability of vehicle can be improved.
Highlights
ESP (Electronic Stability Program)can help to control the vehicle's yaw rate and limit the side-slip angle in a certain range by controlling the wheel braking force or the engine output torque, to avoid sudden obstacles ahead, u-turn lane in high-speed or under extreme adhesion conditions, it can assist the driver to control the vehicle handling and stability to prevent the vehicle from understeering or oversteering, rollover risk condition [1]
Fatal accidents of the vehicle with this system decreased from 30% to 50%, while such accidents of the SUV reduced by 50%-70%
First a template is established in ADAMS/Car, the subsystems can be generated with templates, the model is generated by the subsystems, i.e. The subsystem is a combination of different templates, suspension and vehicle models are built on the basis of the various subsystems, modeling sequence as shown in Fig. (1)
Summary
ESP (Electronic Stability Program)can help to control the vehicle's yaw rate and limit the side-slip angle in a certain range by controlling the wheel braking force or the engine output torque, to avoid sudden obstacles ahead, u-turn lane in high-speed or under extreme adhesion conditions, it can assist the driver to control the vehicle handling and stability to prevent the vehicle from understeering or oversteering, rollover risk condition [1]. Fatal accidents of the vehicle with this system decreased from 30% to 50%, while such accidents of the SUV reduced by 50%-70%. If all vehicles in the U.S were installed with ESP, it would reduce 600,000 accidents and 10,000 fatal accidents each year. Research on 1.5 million Mercedes-Benz cars showed that, the proportion of accidents decreased by 30% [3]. Since 1988, after the civil ABS (1978) and TCS (1986) achieved mass production in the Bosch company, Heess, described a kind of vehicle dynamics control system integrated ABS, TCS, suspension system and steering system, and proposed the corresponding industrial solutions [6]. The ESP simulation model of a car is established and to conduct research the control strategy of ESP. Test and simulation analysis are proposed in condition of dry road and ice road to verify the control strategy
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