Component description for a camshaft solenoid - GF05.20-P-2100V: Notes

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ENGINE 272.920 in MODEL 203

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203, 209

ENGINE 272.941 in MODEL 203

ENGINE 272.942 in MODEL 171

ENGINE 272.943 in MODEL 211

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251

ENGINE 272.946 in MODEL 221

ENGINE 272.960 in MODEL 203, 209

ENGINE 272.963 in MODEL 171

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221

ENGINE 272.966 in MODEL 230

ENGINE 272.967 in MODEL 164, 251

ENGINE 272.970 in MODEL 203

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221

ENGINE 273.922 in MODEL 221

ENGINE 273.923 in MODEL 164

ENGINE 273.924 in MODEL 221

ENGINE 273.943 in MODEL 164

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251

ENGINE 273.965 in MODEL 230

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221

Location

The solenoids are located in front of the respective camshaft.

Fig 1: Locating Camshaft Intake And Exhaust Solenoids - Engine 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

The solenoids actuate the control plunger on the vane-cell adjuster according to the performance map related duty cycle. Depending on their position, more or less pressure oil flows from the hollow camshaft into the oil galleries of the vane-type adjuster.

Design

The solenoids for camshaft adjustment are designed as proportional magnets, i.e. the direction of the armature and thus the position of the control plunger in the vane-type adjuster are dependent on the intensity of the current in the coil.

Shown on engine 272

Fig 2: Identifying Camshaft Intake And Exhaust Solenoids - Shown On Engine 272

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

The solenoids before the camshafts are actuated by the ME control unit at the ground end by means of a PWM signal (150 Hz). The voltage supply for the solenoid takes place from circuit 87. The vane cell adjuster are actuated according to the performance map related duty cycle.

The maximum current (duty cycle 100 %) is emitted for a short time (about 0.5 seconds) for rapid adjusting of the anchor. A hold-in winding voltage with a small duty cycle is then set afterwards. The coil resistance at room temperature is approx. 7.5 Ω.

Depending on their position, the oil volume in the vane-type adjusters is controlled. This takes place through differently arranged holes in the control plunger as well as through oil ducts in the vane-cell adjusters. The adjusting range of the camshaft is limited by the forming of the vane-cell adjuster mechanically. If the solenoids are no longer actuated then resetting takes place against the direction of rotation.

The following positions are possible:

Filling the oil gallery
Pressure oil flows out of the hollow camshafts into the vane-cell adjuster. The camshafts adjust themselves to the respective direction of rotation. The inlet camshafts adjust to "advanced". The exhaust camshafts adjust themselves due to their reversed direction of rotation to "retarded".
Oil gallery closed
Each camshaft position is detected by a camshaft Hall sensor. Once the requested adjustment has been achieved then the respective solenoid will be actuated in such a way that oil galleries in the vane-cell adjusters are closed.
Emptying the oil gallery
The camshafts adjust themselves against their direction of rotation.