Electric vehicle weight estimation device and weight estimation method

摘要

PROBLEM TO BE SOLVED: To provide a weight estimation device and a weight estimation method for an electric vehicle capable of accurately and easily estimating the weight of the electric vehicle. SOLUTION: A torque distribution ratio control unit 12 for changing a torque distribution ratio between a front wheel motor 40 and a rear wheel motor 50, and a traction for estimating traction limit values of the front wheels 60 and the rear wheels 70 when accelerating an electric vehicle 1, respectively. Based on the limit value estimation unit 13, the torque distribution ratio before and after the change, and the traction limit values of the front and rear wheels before and after the change of the torque distribution ratio, the front wheels 60 and the rear wheels when the electric vehicle 1 is not accelerating. A vertical load estimation unit 14 that estimates the vertical load applied to each of the 70s, and a vehicle weight estimation unit that estimates the weight of the electric vehicle 1 based on the vertical loads applied to the front wheels 60 and the rear wheels 70 when the electric vehicle 1 is not accelerating. It has 15. [Selection diagram] Fig. 2