| 摘要 |
An electric power steering control system in which by using a brushless motor as a motor for generating steering assist force, less trouble occurs, and an error in torque control and transient vibration are small even when a steering wheel is turned sharply.The electric power steering control system is arranged so as to control a drive current of a brushless motor that generates a steering assist force on the basis of steering torque acting on a steering shaft and a vehicle speed. The system comprises a d-q axis voltage command section for computing a d- and q-axis voltage command value in response to a deviation of current between a d- and q-axis current command value and a d- and q-axis detection current value, a d-q coordinate inverse transformation section for performing the d-q coordinate inverse transformation on the basis of the d- and q-axis voltage command value and an electrical angle signal eventually thereby computing a three-phase voltage command value, and a PWM output section for generating a PWM waveform for PWM drive of the brushless motor in response to the three-phase voltage command compensation value. |
