| 摘要 |
It is an object of the present invention to provide a controller for a power steering apparatus judging a fault of a parasitic diode and detecting a fault of a power relay when the MOS-FET is mounted for the power relay. The electrical power steering apparatus (10) includes the 1 st MOS-FET (13) and the 2 nd MOS-FET (14) accommodating the 1 st parasitic diode (15) and the 2 nd parasitic diode (16) in the conducting path between the battery (100) and the motor driving circuit (11) and being connected in series at the opposite direction respectively, and the condenser (18) in an output side of the latter 2 nd MOS-FET (14). The ECU (6) of the controller of the electrical power steering apparatus controls to turn on or off the 1 st MOS-FET (13) and the 2 nd MOS-FET (14) in accordance with the predetermined sequence after the ignition switch (17) is turned on, detecting the fault of the 1 st MOS-FET (13), the 2 nd MOS-FET (14) and the 1 st parasitic diode (15) and the 2 nd parasitic diode (16) on the basis of the output voltage from each of the 1 st MOS-FET (13) and the 2 nd MOS-FET (14). It is therefore for the controller of the electrical power steering apparatus to be able to detect the fault of the MOS-FETs certainly and to judge the fault of the parasitic diode. |
