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Automotive : Powertrain : CAM sensor

The Engine Management System is aware of the top-dead-center piston position from the crank sensor and by counting teeth can tell exactly where the engine position is at any time. It is also aware of the engines cycle position from the cam sensor. It uses this information together with the information from the throttle position sensor/MAP sensor to lookup the appropriate ignition timing settings from the ignition map. Using the crank and cam position sensors it is then able to determine exactly when to fire each individual coil since it knows which cylinder is at the firing position of the cycle. Each cylinders individual coil is fired once per engine cycle at exactly the appropriate time. The spark is routed directly to the appropriate cylinder.

Melexis developed a self adjusting digital output gear tooth sensor IC designed for use in automotive camshaft sensing as well as other speed sensing applications.

Related Melexis Products : Automotive : Powertrain : CAM sensor

Part Number

Description

MLX90217

Cam Sensor

Related Application Notes : Automotive : Powertrain : CAM sensor