METHOD FOR SIMULATION OF PERFORMANCE OF VEHICLE ON SURFACE OF ROAD

摘要

PROBLEM TO BE SOLVED: To simulate the behavior of a tire on the surface of a road by an electric loading device by deciding a torque setting point value under a condition under which a difference corresponding to a slip generated between a nominal wheel angular-velocity measured value and a vehicle-speed calculated value is established automatically by a feedback system. SOLUTION: The wheel angular velocity, of a driving shaft 2, which expresses the initial wheel angular velocity of a wheel simulated by an electric loading device 20 is measured by a wheel speed sensor. Its value is transmitted to a computer as a wheel angular velocityωR1 so as to be input to a tire model part 30. The tire model part 30 supplies a torque setting point Msoll 12 as an output mount and a longitudinal force FX1 to be transmitted to the surface of a road from a tire. In order to calculate a vehicle speed (v), the longitudinal force FX1 is fed back to a vehicle model part 40. The vehicle speed (v) is calculated in such a way that the difference between the sum total of the longitudinal force FX1 and a vehicle resistance force is integrated by using an integration time constant which corresponds to the mass of a vehicle.