Running controller and electric running control system for electric vehicle

摘要

A running controller and an electric running control system for an electric vehicle, in which when a tire slip occurs during running of the vehicle, such as under driving, braking and turning, a motor output is controlled to always maximize the coefficient µ of road friction, thereby obtaining a maximum tire driving force and a maximum tire braking force. In the electric vehicle, wheels 4, 5, 6, 7 are driven and braked through control of electric driving apparatus 8, 9 each including a motor 101. When slipping of any of the wheels 4, 5, 6, 7 is detected, ESC-CU 31 executes powering and regenerative control of the motor 101 to change, depending on road conditions, a target value to which a slip rate is to be converged. The ESC-CU 31 calculates the coefficient µ of road friction based on a motor current and executes the powering and regenerative control of the motor 101 such that the calculated coefficient µ of road friction is maintained in the vicinity of a maximum value thereof.