INTRODUCTION OF AN ELECTROMAGNETIC ANTI-LOCK BRAKING SYSTEM (EMBAS) AND COMPARISON OF ITS OPERATION WITH ANTI-LOCK BRAKING SYSTEM (ABS)

Anti-lock braking system (ABS) is an automobile safety system that allows the wheels on a motor vehicle to maintain tractive contact with the road surface according to driver inputs. It is reported that this system can be considered as one of the most important options in vehicle safety and consequently, concentration upon this system can be extremely useful. In conventional anti-lock braking systems, the braking force is generated by hydraulic pressure and then is applied to the driven wheels through hydraulic circuits. Whereas, the fundamental of braking force generation in EMABS is thoroughly different. In this paper, basic concepts of electromagnetic anti-lock braking system are introduced and some of its important advantages in comparison with conventional anti-lock braking systems are presented. In EMABS, a portion of braking force is generated by using an electromagnetic relay and is transmitted into braking shoes through hydraulic circuits. It should be noted that the initial pressure of braking force in EMABS is also generated by a hydraulic booster and it causes the locking of driven wheels. Afterward, the performance of electromagnetic anti-lock system will be started and the locked wheel will be released.