A NEW WAY TO CONTROL THE DISTRIBUTION OF BRAKING FORCES BETWEEN THE AXLES OF THE CAR

Abstract

The distribution of braking forces between the axles has a significant impact on the stability of the car when braking. Over the years, dozens of authors have proposed various methods for regulating braking forces and devices for their implementation (brake force regulators - RTS). The regulation process in most of the known technical solutions was carried out by changing the ratio of the pressure of the working fluid (liquid or air) in the actuators of the brake drive of the front and rear brakes. To change the ratio of the specified pressure, the regulation of the working fluid was used, which led to the instability of the regulation characteristics and the failure of the brake system. In this article, a new method for controlling the distribution of braking forces between the axles is proposed and researched, the essence of which is to change the ratio of the total areas of the actuators of the brake drives (the areas of the pistons of the working brake cylinders). The implementation of this method of controlling the distribution of braking forces between the axles became possible due to the creation of open-type multi-piston disc brakes with two pairs of concentrically arranged brake pads. The proposed method makes it possible to increase the stability of the car not only during emergency, but also during service braking. The aim of the study is to increase the stability of the car during emergency and service braking by using a new method of controlling the distribution of braking forces between the axles by discretely changing the size of the active working areas of the working brake cylinders. To achieve this goal, the tasks of determining the value of the coefficient of distribution of the brake force on the front axle of the car with a different combination of the included working brake cylinders on the wheels and rear wheels and determining the threshold values of the car deceleration, at which it is necessary to change the ratio of the included working brake cylinders on the wheels of the front and rear axles, are solved .The results of the study showed that the use of multi-piston disc brakes on the front and rear wheels of a twoaxle vehicle makes it possible to organize the process of impulse control of the distribution of braking forces between the axles.