1584 Variable camshaft timing with valve · stroke control (VarioCam Plus)

911 Engine 1 1584 Variable camshaft timing with valve stroke control (VarioCam Plus) The demands placed on the design of an engine, i.e. increased performance, improved driving comfort, observance of legal emission limits and reduced fuel consumption, result in contradictory construction criteria. The idea behind the development of the VarioCam Plus was to create a variable engine which can be optimised both for maximum performance and for frequent use in urban traffic or on main roads. A system to adjust the intake camshaft to vary the opening and closing time combined with a valve stroke adjustment system is the solution to this problem. 1580 Control element for camshaft The camshaft adjuster is based on the principle of a vane cell adjuster. The control unit determines the current position of the camshaft in relation to the crankshaft (actual angle) using the engine speed and hall sensor signal. The position control in the control unit 1_14_02 receives the desired angle via the programmed map values (engine speed, 1 - Speed sensor- load, engine temperature). If the desired 2 - Hall sensor angle and actual angle differ, a controller in 3 - Camshaft actual angle the Motronic actuates the 4-way 4 - Camshaft control proportioning valve to the desired position. 5 - Desired angle tmot - Engine temperature Ml - Engine load N - Engine speed 9 - 4-way proportioning valve 10 - Control element for camshaft 2002 Service Information 1 - 7