ROAD GRADIENT ESTIMATION METHOD FOR HYBRID VEHICLE, AND HYBRID VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a road gradient estimation method for a hybrid vehicle and the vehicle, the method and vehicle enabling high precision estimation of a road gradient when a vehicle is slowed and stopped by using data obtained by already provided instrument equipped for driving the vehicle without using an accelerometer or a gradient sensor such as an inclination sensor, that is, no new instrument that would add a cost, in the hybrid vehicle that includes an internal combustion engine and a motor generator and is enabled to obtain regenerative braking force for decelerating the vehicle with the motor generator.SOLUTION: When a hybrid vehicle is decelerated or stopped, standard deceleration s for an even road is calculated on the basis of regenerative braking force Tm of a motor generator, brake braking force Tb of a normal-use brake, a vehicle speed V and a vehicle weight W. Then a road gradient is calculated when the vehicle is decelerated or stopped by comparing the standard deceleration s with an actually detected deceleration m.