Browse Publications Technical Papers 2007-32-0111
2007-10-30

Design and Development of Electronically Assisted Braking System [EABS] For Two Wheeler 2007-32-0111

In automotive braking system the main purpose of a brake is to retard or stop the vehicle by converting the kinetic energy of vehicle motion into rotational frictional torque at the brake pads. This energy will then changed to heat energy and dissipated to surrounding air. The most powerful brake itself will not stop the vehicle effectively if the road surface has little wet or no traction and also if the wheels are locked. Mash the brake lever and the wheels will stop turning, but the vehicle will skid along. Many drivers tend to think that the brake skid as a “brake failure” and in fact the situation is really a failure of the driver to understand the traction conditions and to drive accordingly. Front brake is always designed to be stronger than the rear brake. Since when the brakes (front or rear) are applied, the weight of the bike and rider transfers forward and eventually onto the front wheel. This is the reason for a bike's front end dives when driver applies the brake. To address the above issues, a new brake management system called “Electronically Assisted Braking System” (EABS) has been developed to prevent the wheel lock. EABS uses a combination of electronics and hydraulic controls to allow braking right up to the point of wheel lock-up, the system interfere to reduce fluid pressure to the brake and to keep the vehicle deceleration at its maximum at the given road conditions. The Electronic Control Unit (ECU) monitors the vehicle speed continuously at all times using wheel speed sensor, which gives input signal to the ECU, which controls the linear actuator. The linear actuator controls the hydraulic control valve to give variable cut-in pressure according to the vehicle speed which in-turn will reduce the output pressure to the caliper. Experimental results have been obtained for various cut-in pressures by the movement of screw in hydraulic control valve. The results of EABS were compared with the conventional disc braking system. It shows that the maximum deceleration was achieved at very short period of time compared with the conventional braking system.

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