Is the speed displayed on the car dashboard the instantaneous speed?

1 Answers
DelStephanie
07/30/25 6:17am
The speed displayed on the car dashboard is the instantaneous speed. Speedometer and odometer: The speedometer actually consists of two gauges. One is the speedometer, and the other is the odometer. Traditional speedometers are mechanical. A typical mechanical odometer is connected to a flexible shaft, which contains a steel cable inside. The other end of the flexible shaft is connected to a gear in the transmission. The rotation of the gear drives the steel cable to rotate, which in turn rotates a magnet inside the odometer housing. Tachometer: The tachometer is generally located on the instrument panel, placed symmetrically with the speedometer. The tachometer operates based on magnetic principles, receiving pulse signals generated when the primary current in the ignition coil is interrupted. It then converts this signal 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 gauge.
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