THE EFFECT OF A REDUCTION IN THE RADIAL REACTION OF THE VEHICLE WHEEL ON THE STABILITY OF THE CAR DURING A SIMPLE CHANGE OF DIRECTION

Abstract

The paper deals with a mutual comparison of the differences in the car's behavior when achieving a reduced adhesion force using a sliding frame and when driving on a slippery surface. The author deals with the possibility of bringing a road vehicle to the limit of skidding, at a safe speed. The aim of this paper aimsdifferences in the behavior of the experimental vehicle with the slip frame system against the behaviour of the experimental vehicle on the slip surface. In both cases, the vehicle motion under reduced adhesion force is monitored. The reduction of the adhesion force occurred when using the sliding frame with the help of a reduction of the radial reaction on the vehicle wheels, in the second case the adhesion force was reduced by a decrease in the coefficient of adhesion. So, the vehicle was moving on a slippery surface. The skid frame is an auxiliary device with four support wheels attached to the attached. By means of hydraulic disposing the support wheels, the radial reactions transmitted by the vehicle wheels can be reduced. In order to reduce the adToe transmitted by the vehicle wheels, part of the given radial reaction of the vehicle wheel is transmitted by the additional support wheels. A slip surface is a specially treated area where the surface is a special filmcharacter when scraped by water, has a significantly lower coefficient of adhesion than a conventional bituminous surface. In the preparation of this paper, experimental measurements were made for both driving modes and compared with each other. An avoidance maneuver between cones maneuver as the driving test. The Alternative SkidCar system helps to create any kind of skidding with respect to both longitudinal and transverse planes of the vehicle, which is not achievable on a skid surface. Alternative SkidCar has its application in the field as an initial tool to validate newly developed electronic vehicle systems and to improve road safety in driver training. In the construction of the test corridor for the Alternative SkidCar system, a modification was made to the slip resistant surface. As the Alternative SkidCar extends beyond the footprint of the vehicle, we had to adapt the corridor layout to the slip surface for this purpose. Evaluation of the measured waveforms shows that the Alternative SkidCar system can be used to modify the adhesion force transmitted by the vehicle wheels. The weight of the ASC frame is ¼ of the kerb weight of the car, tcurbfore the resulting measured characteristics take slightly different waveforms, but it is still applicable.