| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of a correction start timing when correcting travel information when occurrence of slide idling is detected.SOLUTION: When a slide idling detection part 162 detects occurrence of slide idling, a correction start timing determination part 170 determines a correction start timing. In other words, the timing in which, added acceleration difference which is difference between tachometer system added acceleration and inertial system added acceleration satisfies a predetermined condition, at the latest point going back from the timing when occurrence of slide idling is detected, is determined as the correction start timing, from accumulation data 320. After the correction start timing is determined, a position correction part 180 corrects the travel information on and after the correction start timing.SELECTED DRAWING: Figure 1 |
