The method for rapid assessment of vehicle stability in traction mode

Abstract

One of the important operational properties of a car that ensures traffic safety is the stability of the car. The loss of stability of the car is a negative phenomenon leading to the occurrence of road accidents. Currently, a number of electronic systems are used to eliminate the loss of stability of the car. But most of them are aimed at eliminating the loss of stability, and not at preventing this condition. Depending on the driving mode of the car (traction, free run), the stability of its movement is evaluated by various parameters. These parameters can be used to quickly assess the stability of the vehicle, but this requires adequate techniques that take into account the main parameters of the car that affect its stability when driving, as well as traffic conditions. The currently existing methods and expressions for calculating the stability parameters of a car have a number of assumptions. This does not reduce their value, but somewhat reduces the accuracy. The purpose of this work was to increase the stability of the car by developing a method for quickly assessing its stability in traction mode. In theoretical studies, it was found that the stability coefficient can be used to assess the stability of a car with all-wheel or rear-wheel drive. It is equal to the ratio of the stabilizing moment of the car to the perturbing one. If this coefficient is greater than one, the car will be stable. The expression for its calculation includes a number of design and operational parameters of the vehicle. Expressing from it the acceleration values corresponding to the values of the stability coefficient greater than one, we get the maximum permissible accelerations that ensure stable movement of the car. Based on this, a method of operational assessment of the stability of the car was proposed, which consists in comparing the maximum permissible accelerations of the car with the actual ones. To improve the accuracy of calculations of the maximum permissible accelerations, it is proposed to determine the height of the center of mass of the car depending on its actual mass using linear interpolation. The scientific novelty of this work is the proposed method of operational assessment of the stability of the car, based on a refined methodology for calculating the maximum permissible accelerations. To calculate the values of the maximum allowable accelerations according to the proposed method, a computer program was developed. The direction of further research is to assess the adequacy of the proposed method by conducting experimental studies.

Keywords

• car
• directional stability
• traction mode of the car
• the center of mass of the car
• permissible acceleration of the car