Simulation of a Motorcycle Motion during Braking at Cornering Using MATLAB

An automobile braking system has a crucial role for safety of the passenger and riding quality of the vehicle. The brakingforce mainly depends on the normal reaction on the wheel and the coefficientof adhesion between the tire and the road surface. Sometimes the motorcycle may be over braked (Braking force exceeds the traction capacity between tire and ground) that increases vehicle stopping distance due to wheel sliding. So a variable braking force (VBF) system is developed in whichthe effective brake disc radius is variedbased on the pillion load on the motorcycle, for varying the rear wheel braking force that develops between tire and road surface. Whenever amotorcycleis loaded, the normal reaction on the rear wheel is increased.Thus the amount of braking force required to halt the motorcycle withminimum stopping distance and stability of the motorcycle, is based on the pillion load on the motorcycle. Hencethe amount of braking forcedeveloped between the road surface and the tire is varied in the variable braking force system. In this work, a mathematical modeling is developed and analyzed using MATLAB when the rear brake is applied for a motorcycleduring cornering for conventional disc brake system and the variable braking force system. It is found that variable braking force system develops more amount of yaw rate and lateral displacement when it is compared with conventional disc brake.