TRW Electric Parking Brake EPB

EPB ECU Safety concept

• The EPB ECU is based on a 2 processor concept
• 2 different micro processors calculate and control the actuation demand (diversity).
• The switch signal is read and checked for validity by each processor independently.
• Any actuation will only be processed when both processors calculate the same actuation demand.
• The control demands of each processor will be compared via an inter-processor communication line. Each processor has the ability to disable the actuation in case of a fault.
• Both actuators will be controlled independently and are separately fused.

Key features which may be incorporated into the TRW Electric Parking Brake system:

• Drive away assist upon vehicle acceleration, the park brake releases
• Hill Hold prevents vehicle rollback on a hill until the driver accelerates
• Brake wear sensing alerts the driver to worn pads
• Interface between the Electric Parking Brake switch and accelerator pedal prevents false-apply
• Automatic parking brake function when driver’s door is opened