Patent ID: 6061627
Filing Date: 2000-05-09
Classification: G01C

Abstract:
A vehicle position calculating system for calculating a current position of a vehicle, comprising:means for storing map data representing a road map;means for detecting a headed direction of the vehicle;means for detecting a wheel rotational speed of the vehicle;travel distance calculating means for calculating a travel distance of the vehicle in accordance with the detected wheel rotational speed and a distance factor;means for estimating a current position of the vehicle in accordance with the calculated travel distance of the vehicle, the detected headed direction and the road map represented by said map data; anddistance factor correction means for obtaining an angular difference between the detected headed direction and a direction of the road at the estimated current position of the vehicle on the road map represented by the map data, accumulating the angular differences obtained until the travel distance reaches a predetermined distance, and correcting the distance factor in accordance with the accumulated value.