Signal control apparatus and electric power steering apparatus using same

A signal control apparatus comprising:

• at least two microcomputers configured to control a rotary electric machine, wherein
• the at least two microcomputers include a first microcomputer and a second microcomputer,
• the first microcomputer is programmed to:
• acquire a first sensor signal from a first sensor, the first sensor configured to detect a rotation angle of the rotary electric machine;
• calculate a detection angle of a first system in correspondence to the first sensor signal;
• and
• perform angle feedback control based on a first angle difference between a target angle of the first system and the detection angle of the first system,
• the second microcomputer is programmed to:
• acquire a second sensor signal from a second sensor that is different from the first sensor, the second sensor configured to detect the rotation angle of the rotary electric machine;
• calculate a detection angle of a second system in correspondence to the second sensor signal;
• and
• perform angle feedback control based on a second angle difference between a target angle of the first system and the detection angle of the second system, and
• wherein the first microcomputer is programmed to perform the angle feedback control by using the first angle difference, which is subjected to correction processing for reducing an angle error between the detection angle of the first system and the detection angle of the second system, and
• wherein:
• the first microcomputer performs the angle feedback control based on the first angle difference between the target angle of the first system and the detection angle of the first system, in which the detection angle of the first system is corrected using a correction value, the correction value corresponding to an angle error, which is a difference between the detection angle of the first system and the detection angle of the second system calculated by the second microcomputer;
• and
• the first microcomputer includes a memory configured to store the correction value.