| 摘要 |
<p>A speedometer for a vehicle displays speed and mileage accurately and provides such speed information for a system that requires accurate speed information. A speedometer (42) can be connected with a navigation device (10). The navigation device (10) corrects the correction data for mileage per pulse, for example, based on GPS signals and pulses from a car speed sensor (40) and sends corrected data to a navigation data storage (50) of the speedometer (42). A data switch (54) supplies a speed processor (56) with the corrected data for mileage per pulse stored in the navigation data storage (50). The speed processor (56) determines car speed based on the received data and the car speed signal. The corrected car speed data is supplied through a speed information output (60) to a system (48) that uses the speed information.</p> |
