Tachometersignalen

Tachometersignalen, often referred to as the tachometer signal, is an electrical signal used in vehicles to communicate the rotational speed of the engine to the tachometer gauge. This signal typically originates from the engine's ignition system or a dedicated sensor. In older vehicles, the tachometer signal might have been derived from the negative terminal of the ignition coil, where each pulse corresponded to an ignition event. More modern vehicles commonly employ crankshaft position sensors or camshaft position sensors to generate a more precise and reliable tachometer signal.

The tachometer signal is essentially a series of voltage pulses. The frequency of these pulses is directly proportional to the engine's revolutions per minute (RPM). The vehicle's tachometer gauge, a dashboard instrument, receives this signal and interprets the pulse frequency to display the engine speed. For example, a higher frequency of pulses indicates a faster engine rotation, and thus a higher RPM reading on the gauge. The specific voltage levels and signal patterns can vary between different vehicle manufacturers and types of ignition systems. Understanding the tachometer signal is crucial for diagnosing engine performance issues and for the proper functioning of various engine control modules that rely on accurate RPM data.