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Research and Simulated Vehicle Stability Control on Turning and Braking Maneuvers

Author: TangBaoLong
Tutor: YangYing
School: Northeastern University
Course: Vehicle Engineering
Keywords: Vehicle Combined Steering and Braking Maneuvers ABS Stability Control
CLC: U463.5
Type: Master's thesis
Year: 2009
Downloads: 141
Quote: 0
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Abstract


Vehicle’s combined steering and braking maneuvers is a much more complex working condition, which is quite different from the braking on straight road. The load transfer and huge side slip make it difficult to control the stability on combined steering and braking maneuvers. On the other hand, the accompanied braking for vehicle’s avoiding obstacle, and the accompanied braking and emergency braking on curved road are quite common in the real driving. Under the conditions mentioned above, the vehicle can easily lose its stability, which is very dangerous, so it is necessary to study stability control on combined steering and braking maneuvers.For a long time, a lot of researches about anti-braking system have been done.ABS can improve the braking stability to some extent, and shorten the braking distance.First, the eight freedom of motion vehicle model is constructed by introducing conventional coordinates. The whole vehicle model includes wheel model, brake actuator model, vehicle chassis model, load shift calculation model, wheel lateral deviation angel calculation model and so on.Secondly, turning braking vehicles factors affecting the stability of the in-depth analysis, and turning braking vehicle dynamic characteristics analysis of the simulation, turning braking vehicles instability manifested mainly in the wheels tend to lose their attachment Stability and vehicles tend to shift stability.Third, to better the vehicle’s stability, the stability control should be exerted. So how to choose the control variables to maintain vehicle’s dynamic stability is analyzed. Then the vehicle stability control system on combined steering and braking maneuvers is designed. In the control system, the gradual change speed model of two degrees of freedom is looked as reference model. And then the fuzzy yaw rate control, fuzzy sideslip angle control and the control combined with yaw rate and sideslip angle are established. Last, a multi-body dynamic model was built with MSC.ADAMS which was used widely in vehicle simulation field. Several kinds of control methods were designed for the VDC model based on the feedback of side slip angle and yaw rate, including threshold control, PID control and fuzzy control. Dynamic model and control model were co-simulated by MATLAB and ADAMS/Control through TCP/IP connection.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Braking system
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