Seat occupied recognition with automatic child seat recognition, component description - GF91.60-P-4035T

MODELS 211.0/2 up to 18.2.04 with CODE (494) USA version

MODELS 211.0/2 up to 31.5.05 except CODE (494) USA version

MODELS 211.0/2 as of 1.6.05 with CODE (U18) Automatic child seat recognition (ACSR)

Location

The seat occupied and automatic child seat recognition is integrated in the seat cushion of the front passenger seat.

Fig 1: Locating Front Passenger Seat Occupied And Child Seat Recognition Sensor

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Tasks

The seat occupied and automatic child seat recognition determines and recognizes a child seat with an installed transponder and its direction of installation. Moreover, the seat occupied and automatic child seat recognition can recognize, whether or not the front passenger seat is occupied by a person and can decide, whether the person is heavy or lightweight. With the aid of the weight classification of the front passenger, the system decides which restraint systems are necessary to be triggered.

As of 1.6.05 the weight classification of the front passenger is omitted.

Function

Child seat recognition

The functionality of the automatic child seat recognition is only given where a DaimlerChrysler approved and control unit coded child seat is used.

This child seat must be equipped with two transponders (resonators), which are located in its base on the left and right. When a child seat is in position, the signals, which the electronic analysis system sends via the transmitting antennas in the sensor mat, are changed by the resonators located in the child seat. The signals are picked up by the respective receiving antennae in the sensor mat and sent to the electronic analysis system. The electronic analysis system evaluates the signals and signals to the restraint systems control unit (N2/7), whether or not a child seat is installed, whether the child seat was positioned incorrectly, or whether it was installed forward-facing or rear-facing.

Seat occupied recognition (up to 31.5.05)

If the front passenger seat is occupied by a person, the pressure load of the seat area increases. This pressure load is sensed by the integrated force sensing resistors in the seat cushion and allocated to the corresponding weight classification. Depending upon the weight classification, a signal is transmitted to the restraint systems control unit and evaluated by the system. This helps to decide which restraint systems are necessary to be triggered.

Weight classification of the front passenger

Lightweight person: Triggering the first ignition stage

Heavy person:Triggering the first and second ignition stage

Seat occupied recognition (as of 1.6.05)

If the front passenger seat is occupied by a person, the pressure load of the seat area increases. This pressure load is recognized by the force sensing resistors integrated in the seat cushions. This helps to decide which restraint systems are necessary to be triggered.