Active Sound Generator Control Unit For Engine Sound, Basic Function - GF82.60-P-9891A

Model all (CAR) 

with code 96B (Road noise cancellation via speakers (RNC)) 

Model all (CAR) 

with code 97B (Engine noise reduction via speakers (EOC)) 

Model all (CAR) 

with code MEF3 (AMG Entry variant with L battery + 4MATIC) 

General 

The sound generator control unit is used in vehicles as of telematics unit version (NTG) NTG 7.

The sound generator control unit reduces engine and driving noises in the vehicle interior by generating counter signals (inverted signals).

This includes:

• Receiving and evaluating from acceleration sensors at the wheels and axles for driving noise reduction

  The acceleration sensors supply a reference signal from which the rolling noises are derived.

• Receiving and evaluating engine data via CAN interface for engine noise reduction
• Receiving and evaluating microphone signals

  The transmission path in the vehicle interior is monitored using microphones.

• Generating the forwarding the counter-signals via audio bus

  With hybrid and electric vehicles, the sound generator control unit compensates for the low acoustic feedback of the electric motors. This includes:

• Receiving and evaluating engine data via the CAN interface
• Generating and forwarding simulated engine noise signals and acoustic feedback via audio bus
• Generating and forwarding actuation signals for steering wheel vibrations

In hybrid and electric vehicles, the sound generator control unit also actuates the sound generators for external noise. This ensures that the vehicles are acoustically perceptible at low speeds (up to 30 km/h). For this purpose, the sound generator control unit reads in the speed signal and the accelerator pedal position.

At speeds of more than 30 km/h, the rolling noises and wind noises are loud enough that the vehicle can be perceived.

Location 

The sound generator control unit is located in the trunk/load compartment on the left behind the side trim.

Function requirements: 

• Circuit 30t, for driving noise reduction and compensation of missing engine noises in hybrid and electric vehicles
• Engine running, for engine noise reduction and actuation of sound generators for external noise