Frictional coefficient depending on active friction radius with BPV and BTV in automobile disc braking system

Abstract

The present paper theoretically investigates the behaviour of frictional coefficient considering variants as active friction radius, brake force variation (BPV) and brake torque variation (BTV) in automobile disc brake system. The variations in the frictional coefficient on the piston side of the rotor disc and on the non piston side has been tracked with the use of equations obtained for the disc brake system under equilibrium condition .The effect of parameters like active friction radius, BPV and BTV has been studied as per the computations of the estimation algorithm. The formulated equations were solved by using the input parameters acquired using the braking system and predetermined values. The comparison of estimated frictional coefficient from numerical output is in agreement with vis-à-vis corresponding similar computed from the virtual braking system model in the Simulink. The results indicated that highest frictional coefficient of 0.7 was obtained on the piston side of the rotor disc and active friction radius is predominantly the impact factor for frictional coefficient.

Keywords: Automobile, Mechanical, Frictional Coefficient, disc brake, active friction radius, BPV and BTV