A study of brake proportional effected to vehicle control

Abstract

Braking system is the main of safety for motor vehicle. It uses to slow down or stop of vehicle movement. Normally, braking system can not to adjustable in the recently. The brake efficiency depends up on to 3 factors by the perfection of brake equipment, friction coefficient of road surface and the brake proportional. The factor of the perfection of brake equipment and friction coefficient of road surface can not be control. But in case of the brake proportional can be set up to suitable. In the other hand, if the brake ratio is unsuitable, the driver may be risk to danger from the loss of vehicle control. From this reason, the aim of project is to study of the brake proportional affected to vehicle control. By the test condition consist of 2 cases: braking performance testing and vehicle stability testing. In case of braking performance testing is consider to deceleration, braking distance and time of braking. For the vehicle stability testing is determined with yaw angle, pitch angle, sideslip angle and wheel lock up condition. However, the bolt of testing is the road test and using the FMCSA standard for the testing guideline. The result of the braking performance testing shown the maximum deceleration was appeared on brake proportional 80:20. But the braking distance and time of braking are least because of the non-continuously of deceleration from the driver. Therefore, the braking distance and time of braking depend on the continuously of deceleration. In term of vehicle stability testing discovered to the each of brake proportional are risk to danger for the driver, especially on the 100:0 because of the value of sideslip angle is more than the critical point, and the rear axle is lock up.