PRE-CRASH SAFETY SYSTEM


  1. General


    1. Upon receiving signals from the skid control ECU which indicate that a serious skid is occurring or that the brakes have been applied suddenly, the seat belt control ECU retracts the front seat belts to reduce possible injury to the driver and front passenger.

      Figure 1. Operation Flow

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  2. Serious Vehicle Skid Operation


    1. While the vehicle is traveling at approximately 30 km/h (20 mph) or above, the skid control ECU determines if skid recovery will be difficult based on the signals from the steering angle sensor, yaw rate sensor, and speed sensors.

    2. The skid control ECU sends a seat belt operation request signal to the seat belt control ECU.

    3. The seat belt control ECU determines the seat belt motor operation conditions based on this signal and the front seat buckle switch signal. Then, it retracts the slack in the seat belts by operating the seat belt motors.

    4. The seat belts return to a normal state when the relevant conditions of the vehicle have stabilized.

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  3. Sudden Braking Operation


    1. While the vehicle is traveling at approximately 30 km/h (20 mph) or above, the skid control ECU can determine a sudden braking condition based on the signals from the master cylinder pressure sensor, stop light switch, and speed sensors.

    2. At this time, the skid control ECU outputs a seat belt operation request signal to the seat belt control ECU.

    3. The seat belt control ECU determines the seat belt motor operation conditions based on this signal and the front seat buckle switch signal. Then, it retracts the slack in the seat belts by operating the seat belt motors.

    4. The seat belts return to a normal state when the brake pedal is released.

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