Logic Section

After the ignition is switched on, system initialization and safety checking is started. The system is enabled following a satisfactory check sequence. The conditioned input signals are processed in the logic section and the following values are calculated:

• Vehicle speed from the front wheel speed signals.
• Vehicle acceleration from several successive wheel speed measurements.
• Diaphragm speed: The control module checks the voltage signal from the diaphragm travel sensor every 3 ms. The pedal speed is calculated from the voltage different between two successive measurements.
• Learning algorithm: Calculation of vehicle deceleration for adaptation of triggering threshold to different braking system conditions.
• Threshold: This is calculated from the basic threshold (vehicle identification values), vehicle speed, brake pedal speed and the values from the learning algorithm.

If the calculated values exceed the specified threshold, BAS activation is initiated.

BAS activation is interrupted immediately following a signal from the BAS release switch.