The formation of car skid at a safe speed by reducing the radial response of car wheels

Abstract

The paper deals with the possibility of bringing a car to a skid level at a safe speed. Skid level is caused by a reduction in the adhesion force on car wheels by a decrease in radial responses on car wheels. The aim of the paper is to compare the behavioural changes of the experimental car with the sliding frame system against the driving of the experimental car on a sliding surface. In the work we deal with the analogy of the commercially available SkidCar system. Since the SC system is only produced for selected series-produced cars, we have designed a simplified version called Alternative SkidCar. It is an additional frame with four support wheels attached to the car. The mechanical movement of the support wheels affects the radial reaction transmitted by the car wheels. Car skid at a lower speed is caused by a reduction in adhesion force. To reduce the adhesion force transmitted by the car wheels, we transferred some of the radial response of the car wheel by means of additional support wheels. During the elaboration of the paper, we conducted experimental measurements which we compared with each other. As a test drive, we chose to drive the vehicle between cones, the so-called slalom test. The sliding surface was modified when constructing a test corridor for the Alternative SkidCar system. Since the Alternative SkidCar extends beyond the car’s body, we had to adjust the corridor assembly to the sliding surface for this purpose. It can be seen from the evaluation of the measured waveforms that the Alternative SkidCar system can be used to change the adhesion force transmitted by the car wheels. The weight of the ASC frame reaches ¼ of the kerb weight, so the resulting measured characteristics are slightly different but still applicable. The results, collected during the experimental test, are presented and discussed. The Alternative SkidCar is used in the field as a primary tool to validate newly developed automotive electronic systems and to improve road safety in driver training. The Alternative SkidCar system helps to create any kind of skid relative to the longitudinal and lateral planes of the car.