Evaluation of controllability of a 4wd vehicle at a stable turn

Abstract

This article discusses the conditions for increasing the stability and controllability of four-wheel drive vehicles with steady-state cornering. The aim of the study is to increase the stability and controllability of four-wheel drive vehicles in steady-state cornering. The article defines the conditions for the vehicle to lose trajectory stability and controllability when driving at a steady bend. When this goal was achieved, the following tasks were solved, namely, to determine the total lateral reactions on the front and rear wheels of the four-wheel drive vehicle, the total lateral reactions on the front and rear wheels of the four-wheel drive vehicle and the conditions for the loss of stability and controllability of the four-wheel drive vehicle when established, are presented cornering. An analysis of existing criteria shows various approaches to assessing the maneuverability properties of wheeled vehicles. Despite their diversity, the criteria for qualimetric assessment reflecting the influence of the parameters of wheeled vehicles and the road environment on stability and controllability are not sufficiently presented in the well-known literature. In well-known studies, the controllability of the car in the steady-state stage of the turning process was not considered. As you know, the driver must be able to, when acting on the steering wheel, acting on the steering wheel, ensure that the vehicle follows the curve of a constant curvature accurately. The study has been devoted to ensuring the controllability and stability of cars with steady motion in a straight line and at a turn. However, earlier in the work, the maximum adhesion indicators of the stability and controllability of the car with steady-state cornering were not considered. We have determined that angular acceleration of the car in the plane of the road with an unsteady turn is a criterion for controllability. Therefore, the achievement of the value is a condition for the loss of controllability of the car, and the achievement of the value is a condition for the loss of stability. Thus, the conditions for the loss of vehicle trajectory stability and controllability when driving at a steady bend at the preliminary design stage are determined, these parameters can be incorporated into the vehicle structure and its control system, which will increase vehicle safety and road traffic in general.