Left signal acquisition and actuation module, task - GF54.21-P-4101-03I

Task 

There are two types of input signals in the case of the left front SAM control module (N10/6):

• Digital signals
• Analog signals

Reading in digital signals: 

Depending on how quickly the processor has to react to signal changes, the signals are read in in shorter or longer intervals.

So that the system does not react to short-term faults, the left front SAM control module (N10/6) only takes over signal changes when the new level value has been read in three times in succession.

Reading in analog signals: 

The power supply to the switches and sensors depends on the present battery voltage. Before reading in a switch/sensor, the processor first reads the unfiltered battery voltage. If the voltage is within the valid range, the switch can be read in. This voltage is then set in proportion to the switch voltage. So that the system does not react to short-term faults, the left front SAM control module (N10/6) only takes over changes when the new level value has been read in three times in succession Sensor values are transmitted as physical values.

Reading in following sensors 

• Refrigerant temperature

  The refrigerant temperature sensor (B12/1) is supplied with 5V.

  The sensor ground is to be selected jointly for the refrigerant temperature sensor (B12/1) and refrigerant pressure sensor (B12). The temperature and pressure must also be measured at the same time.

• Refrigerant pressure

  The refrigerant pressure sensor (B12) is supplied with 5 V stabilized. The sensor ground is to be selected jointly for the refrigerant temperature sensor (B12/1) and refrigerant pressure sensor (B12). The temperature and pressure must also be measured at the same time.

• Outside temperature

Output of the following information on the interior CAN (CAN B): 

• Refrigerant compressor ON
• Refrigerant compressor actuating signal

Actuating the refrigerant compressor 

The output of the refrigerant compressor (A9) is controlled continuously.

In order to switch on the refrigerant compressor (A9) the AAC control and operating module (N22) transmits the via CAN B the switch-on request and the specified value (0 - 100%) to the left front SAM control module (N10/6). The refrigerant compressor (A9) is current-controlled (100% corresponds to 1A). At the same time the torque expected from the refrigerant compressor (A9) is conveyed via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) and the ETC [EGS] control module (N15/3). The left front SAM control module (N10/6) transmits load increase signals via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) and switches the refrigerant compressor ON after a defined time delay (approx. t=450 ms) (A9)

In order to switch the refrigerant compressor (A9) Off, the AAC control and operating module (N22) transmits via Can B the switch-off request and the specified value = 0% to the left front SAM control module (N10/6). Simultaneously the refrigerant compressor torque is set to the value of 0 and via the electronic ignition switch control module (N73) conveyed to the motor electronics control module (N3/10) and the ETC [EGS] control module (N15/3). The left front SAM control module (N10/6) transmits the erased load increase signal via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) and switches off the refrigerant compressor (A9) after a defined delay.

Under brisk acceleration the refrigerant compressor (A9) is regulated at the request of the motor electronics control module (N3/10) for a defined time (max. t=10 s) by the left front SAM control module (N10/6) directly to half the request from the AAC control and operating module (N22). The AAC control and operating module (N22) receives the acceleration signal as information. If the engine fan is defective and there is a cooling problem at the same time (engine temperature too high) the motor electronics control module (N3/10) requests an emergency shutoff of the refrigerant compressor (A9) from the AAC control and operating module (N22) or from the left front SAM control module (N10/6).