Where Does the Signal for the Engine Tachometer Come From?

1 Answers
LillianaMarie
07/25/25 2:38pm
The signal for the engine tachometer is provided by the crankshaft position sensor. Tachometer Introduction: The tachometer indicates the engine speed, which shows the revolutions per minute (RPM) of the engine. The tachometer is usually located on the instrument panel, symmetrically placed alongside the speedometer. The tachometer operates based on magnetic principles, receiving pulse signals generated when the primary current in the ignition coil is interrupted, and converting these signals into a displayable RPM value. The faster the engine speed, the more pulses the ignition coil generates, and the higher the RPM value displayed on the tachometer. Engine Speed Overview: Engine speed, gear position, and vehicle speed should be matched. All car engines have an RPM at which they output maximum torque. When the transmission is in a certain gear, and the engine speed reaches the RPM for maximum torque output, the vehicle speed will inevitably reach the maximum speed that the gear can handle. At this point, it is necessary to shift gears.
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