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The automotive engine cam phaser is a sensor device whose main function is to collect the position signals of the air distribution camshaft and input these signals into the electronic control unit (ECU). By means of these signals, the ECU is able to identify the position of the upper compression stop of cylinder 1, thereby enabling sequential injection control, ignition timing control, and deflagration control of the engine. In addition, the signals from the camshaft phaser are used to recognise the first ignition moment at engine start to ensure that the engine can be started smoothly. The operating state of the phaser camshaft directly affects the performance and operating efficiency of the engine, so their proper functioning is essential to ensure stable engine operation.

Mercedes-Benz m274 camshaft is a key component in the engine, its role is to control the opening and closing time of each cylinder inlet and exhaust valve, to make it conform to certain working procedures, control the change law of valve opening, and drive the gasoline pump, oil pump, distributor and other accessories to work.

The auto camshaft is a part of the engine's valve timing mechanism, responsible for driving the valves to open and close at the correct times. It ensures that the engine timely draws in fresh combustible mixture into the cylinders and efficiently expels the burned exhaust gases from the cylinders.