A method for controlling vehicle motion both longitudinally and laterally by using jerk information is described. The original trade-off strategy between the longitudinal traction and the cornering force was experimentally extracted by using jerk information to observe an expert drivers voluntary braking and turning action. The developed control, called G-Vectoring control, is basically an automatic longitudinal acceleration control in accordance with drivers steering maneuvers. It is achieved by determining the longitudinal acceleration command by the vehicle lateral jerk. With the control, the direction of synthetic acceleration (G) seamlessly changes (i.e. vectoring). The improvements in vehicle agility on a normal road and stability on a slippery road were evaluated by computer simulation, especially in view of each tire workload. A dynamic analysis and simulation examination using a four-wheel full vehicle model were conducted to examine the G-Vectoring control on the acceleration and deceleration of a vehicle according to the change in lateral motion or steering input, and the following findings were obtained. 1. The agility and stability can be suitably controlled by using the influence of the vertical load shift and traction force exerted on the cornering force in each stage of a turn, the beginning of the turn, the turn, and the end of the turn. 2. When beginning the turn, a motion that levels the tire workload of all four wheels can be achieved. 3. It is possible to decelerate by forcing a trade-off between the lateral acceleration and without greatly changing the absolute value of the synthetic acceleration longitudinally and laterally. 4. The unstable behavior when the lateral acceleration reverses on the low friction surface can be stabilized front-wheel drive car by using acceleration side control.


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    Title :

    Improvement of vehicle agility and stability by G-vectoring control


    Contributors:


    Publication date :

    2008


    Size :

    6 Seiten, 13 Bilder, 5 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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