How to Read the Speedometer on an Alphard?

[QuinnMarie]

The speedometer of the Alphard is located on the right side of the dashboard. It displays the vehicle's speed in either miles per hour (mph) or kilometers per hour (km/h). The speedometer function requires strong GPS signal support and can display speeds up to 220 km/h. The method for calculating vehicle speed is as follows: 1. The rotor of the speedometer (which has multiple protruding teeth) is fixed on the transmission main shaft and rotates with it. 2. Each time a protruding tooth passes the electronic speedometer sensor probe, the sensor outputs a low-level pulse signal. One full rotation outputs 8 signals. 3. The angular velocity of the transmission output shaft's rotation is calculated based on the pulse frequency, and then combined with the wheel's radius to determine the vehicle's current linear speed.