| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power steering device capable of protecting a motor and an FET from burning damage by heating, by accurately estimating the temperature, and protecting overheat, even when restarted after resetting a CPU. <P>SOLUTION: This electric power steering device includes a temperature sensor 904 for detecting the ambient temperature Temp, a temperature estimating processing section 903 for estimating the inside temperature of an ECU, a volatile memory 905 of the CPU for storing the estimate temperature Tcont and an overheat-protecting limiting current Ovh-Iref, an overheat-protecting processing section 902 for deriving the overheat-protecting limiting current Ovh-Iref, a current-command-value processing section 901 for calculating a current command value Iref, a proportional integral circuit 906 for outputting a voltage command value Vref, a PWM circuit 907 for generating a PWM signal, and a motor driving circuit 909 for supplying a motor current to a motor 120 based on the PWM signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
