Controller for electronic power steering apparatus

Abstract

A controller of an electrically driven power steering apparatus that can be realized by using a low-cost structure to perform a fault diagnosis of A/D converters and that can determine a fault part, for example, which one of the A/D converters is in a fault state to determine whether the application of a steering assist force should be stopped or continued, with the result that the fault diagnosis places no excessive load on a main MCU. A main MCU with an A/D converter (1), a sub MCU with an A/D converter (2), and a D/A converter are provided. The sub MCU outputs a predetermined value to a D/A converter. An error between a predetermined value and a return value (1) obtained by transmitting a predetermined value to the sub MCU through a D/A converter and A/D converter (1) are compared in the sub MCU. An error between a predetermined value and a return value (2) obtained by transmitting a predetermined value to the sub MCU through a D/A converter and A/D converter (2) are compared in the sub MCU to perform the fault diagnosis.

Dependencies are inferred from the claim text.