Interior protection, component description

W80.50-1081-04

Location

1 Housing

B43 Interior protection sensor

The interior protection sensor (B43) is installed in the headliner of the cab above the driver seat.

Task

The interior protection sensor (B43) monitors the interior compartment for motions by transmitting and receiving ultrasonic waves.

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Design

The interior protection sensor (B43) consists of a microcontroller and an ultrasonic sensor, which consists of two ultrasonic speakers and an ultrasonic microphone. The ultrasonic speakers and the ultrasonic microphone are clipped into the housing (1) of the interior protection sensor (B43). Moreover, an inclination angle sensor is integrated into the interior protection sensor (B43).

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Function

The two ultrasonic speakers of the interior protection sensor (B43) transmit the ultrasonic signals into the cab interior. The ultrasonic signals are received by the ultrasonic microphone on the interior protection sensor (B43). The internal microcontroller of the interior protection sensor (B43) evaluates the running times for the ultrasonic signals. If a motion is detected in the passenger compartment and evaluated as alarm-relevant, a message is transmitted to the anti-theft alarm system (ATA) control unit (A6) via ATA-LIN (LIN 11).

Then the anti-theft alarm system (ATA) control unit (A6) triggers an acoustic and visual alarm. The integrated inclination angle sensor operates as an acceleration sensor. During operation, it reacts to any motion in the cab and triggers an alarm as required. Tolerances are stored in the anti-theft alarm system (ATA) control unit (A6) to prevent false alarms. The values of the inclination sensor simultaneously serve as a correction factor for the ultrasonic sensor to prevent false alarms.