Redundant Vehicle Braking System and its Electronic Control Unit and Control Method Thereof

An electronic control unit for a redundant vehicle braking system coupled to a main braking system of the vehicle, comprising:

• a receiving module configured to receive a status signal indicating a status of the main braking system and a sensor signal indicating a driver input condition to the brake pedal and a vehicle speed condition;
• an activation module configured to activate the braking assist function of the redundant braking system when it is judged that the main braking system has entered a mechanical backup state based on the status signal;
• and
• a braking assist module storing a plurality of braking assist modes for implementing the braking assist function, the braking assist module configured to execute a corresponding one of said plurality of braking assist modes based on the sensor signal after the braking assist function is activated, and the braking assist module further configured to switch between a plurality of braking assist modes according in response to changes in brake pedal input conditions and changes in vehicle speed, wherein the plurality of braking assist modes comprises a standby mode, a first-assist adjustable mode, a second-assist adjustable mode, and a braking pressure holding mode.