| 摘要 |
PURPOSE:To reduce the burden of maintenance of a system by obtaining the running distance between turns with utilization of the running distance, calculating the total distance between the turns with utilization of the road data, and calculating the ratio between the running distance and the total distance. CONSTITUTION:When a vehicle turns at a point 3 and a point 8 starting from a point, S, an input, from a direction sensor is changed approximately 90 deg. when the vehicle passes the point 3. At this time, if the node 3 has an angle similar to the running locus, it is set as an end point Estart of the route to correct the node 3. The accumulating value of the pulses of a vehicle speed sensor is recorded when the Estart is determined. it, is waited until the direction is greatly changed next time. When the angular change is found, the accumulating value of pulses is once recorded. If the point of the angular change is a turn on the map as well, it is judged as an end point of the correcting route and set as Eend. The distance of the route on the data is obtained from the determined Estart and Eend, and is compared with the measured value obtained from the accumulating value of pulses, thereby correcting the measured value. This operation is carried out at every turn of the vehicle. |
