NAVIGATION DEVICE, ROAD SLOPE ARITHMETIC METHOD, AND ALTITUDE ARITHMETIC METHOD

摘要

PPROBLEM TO BE SOLVED: To continue road slope calculation even during brake operation and to improve the accuracy of the altitude of one's own vehicle position to be calculated. PSOLUTION: A flat road acceleration arithmetic section 1 calculates flat road acceleration based on engine power torque and vehicle weight, an estimation acceleration arithmetic section 2 calculates estimation acceleration based on the vehicle speed, a road slope arithmetic section 3 calculates road slope based on the flat road acceleration and estimation acceleration, and an altitude arithmetic section 6 calculates altitude using the road slope. At this time, when a brake SW turns on, the road slope arithmetic section 3 predicts the slope of the road where the own vehicle travels based on the road slope calculated just before the brake SW turns on or the rate of change of the road slope until the brake SW turns off. A vehicle weight learning section 7 calculates the present vehicle weight based on the differential value of the estimation acceleration and drive force differential value of the own vehicle, and corrects the vehicle weight suitably using the past vehicle weight. PCOPYRIGHT: (C)2009,JPO&INPIT