Braking ECU can have one or more of the follwoing features
- Normal braking(Brake by wire)
- Anitlock Braking System(ABS)
- Automatic traction control or Traction control system
- Over/Under Steering control
- Rollover Protection
Normal braking(Brake by wire)
It is just the normal braking , but since the ECU controls the system electronically response is faster thereby resulting in faster braking and lesser stopping distance
Antilock Braking System
The ABS controller monitors the speed sensors at all times, looking for extra-ordinary decelerations in the wheel. Right before a wheel locks up (i.e. ceasing rotation), it will experience a rapid deceleration. If left unchecked, the wheel would stop much more quickly than any car could.The ABS controller knows that such a rapid deceleration is impossible, so it reduces the pressure to that brake until it sees an acceleration, then it increases the pressure until it sees the deceleration again. It does this very quickly, before the tire can actually significantly change speed. This results in tire slowing down at the same rate as the car, with the brakes keeping the tires very near the point at which they will start to lock up. This gives the system maximum braking power.When the ABS system is in operation you will feel a pulsing in the brake pedal, this comes from the rapid opening and closing of the valves. Some ABS systems can cycle up to 15 times per second.
Automatic Traction control or Traction control system
If the driving torque on the wheels is higher than the static friction on the wheels, the increasing slip reduces traction and generates the risk of the wheels spinning. Braking ECU detects the tendency to spin and reduces the driving torque to the Engine. if only one wheel tends to spin, a differential braking will be applied to this wheel. At higher speeds, differential braking will be stopped to avoid overheating the brakes.
Over/under Steering control
When the vehicle loses cornering stability i.e., the vehicle no longer follows the driver’s intended direction of driving, the intended driving direction is detected by ECU by means of a steering wheel angle sensor and compared to the actual yaw movement during cornering and brakes are applied on the required wheels to reduce the risk of losing directional control
Rollover Protection
ECU follows a similar strategy , but here longitudinal acceleration is used as the controlling factor
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