Thursday, 30 June 2011

Overview of Brake Systems

Functions
a) Decelerate a vehicle including stopping
b) Maintain vehicle speed during downhill operation
c) Hold a vehicle stationary when on a flat or on a gradient

Fundamental of Brake Systems
i) Generate torque
ii) Convert and transfer energy
The brake system converts the kinetic energy of the moving vehicle into heat.

The brake engineer has two challenges:
1. Create enough deceleration to stop the car as quickly as the driver wishes, without exceeding the drivers comfort level with regard to pedal effort or pedal travel.
2. Manage the resulting heat energy so as not to damage the brake system or the rest of the vehicle.
An interesting observation is that a typical car of this size hasan engine with about 90-105 KW (120-140 HP). This meansthat the brakes have to deal with about twice the power ofwhat the engine puts out.

Since the kinetic energy of a moving vehicle is a function of the square of the speed, the speed from which you wish to stop a vehicle is much more important than the mass of the vehicle.
When selecting a brake system the performance of the powertrain must be taken into consideration.
Weight transfer increases the load on the front wheels while the load on the rear wheels is reduced.

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