Engine Mount: Description and Operation

Engine Mount Control

The controllable engine mounts are switched to "hard" or "soft" corresponding to operating conditions.

Function
The pressure converter connects the engine mounts to the vacuum supply. When the DDE control unit activates the pressure converter, the pressure converter responds by applying vacuum to the engine mounts.

The engine mounts are switched to their soft setting at:
- low speeds (under around 60 kph) and
- below engine speeds that are dependent on the coolant temperature (the engine speeds are between 1000 rpm and 1200 rpm)

Whether the engine mounts respond to activation by switching to their hard or soft settings depends on the model series:
- E65, E6x, E7x: hard.
- E46, E53, E83, E9x: soft.

Fault handling
If a defect occurs in the activation of the pressure converter, a fault is stored.
The engine mount control is switched off faults occur to the following functions:
- Coolant temperature sensor signal.
- Message error speed.

Equipment
The engine-mount control system is present with all 6-cylinder diesel engines.