Variable camshaft timing control, VANOS

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The classic VANOS with separate VANOS solenoid valves has been reconstructed. The use of a VANOS solenoid actuator and a mechanical VANOS central valve will reduce the oil ducts in the cylinder head.

The variable camshaft timing control serves to enhance the torque in the lower and middle engine speed range. At the same time, the most favorable valve operation times for idle speed and maximum power output are adjusted.

The control of the intake and exhaust camshaft is variable within their maximum adjustment range. Once the correct camshaft position has been reached, the VANOS solenoid valves ensure that the oil volume in the positioning cylinders in both chambers remains constant. This keeps the camshafts in this position. To perform the adjustment, the variable camshaft timing control requires a feedback signal on the current position of the camshaft. Camshaft sensors on the intake and exhaust side record the position of the camshafts. On engine start, the intake camshaft is in the end position ("late"). When the engine is started, the exhaust camshaft is pretensioned by a spring and held in the "advanced" position.