| 摘要 |
PURPOSE:To utilize adhesion to the maximum by employing a slip rate of dynamic wheel, a time differentiation and a speed difference of circumferential adhesion, determined based on the circumferential speed of each dynamic wheel and a ground speed of vehicle, as preceding part variables whereas employing a torque command value of an induction motor as following part conditions and then subjecting the torque to fuzzy processing. CONSTITUTION:Induction motors 2A-2D of an electric vehicle 1 are driven through an inverter 101 to rotate dynamic wheels 3A-3D and then rotational speed thereof are detected 4A-4D thus operating 5A-5D a motor frequency. A ground speed Vo of vehicle operated from a driven wheel 14, phase current of each motor, voltage phase theta of the inverter 101 and the motor frequency are then operated 6A-6D. The operating units 6A-6D operate slip rate, adhesion and creep speed for each dynamic wheel, subjecting them to fuzzy inference 8A-8D, weighing 9A-9D, max combination 11 and non-fuzzy operation. An integrated value Ip' is then added to a torque current pattern Ip and current control 107 is carried out to drive the inverter 101. According to the invention, adhesion of all dynamic wheels can be utilized to the maximum. |
