Patent ID: 7242184
Filing Date: 2007-07-10
Classification: F01L,F02D,G01D

Abstract:
1. A rotation angle detecting apparatus for detecting a rotation angle of a rotating body, comprising: a rotation angle sensor configured to output a rotation angle signal according to a rotation angle of a rotating body; and a control unit which comprises: a first conversion section that converts a rotation angle signal outputted by said rotation angle sensor into a rotation angle detection value, based on a signal value of the rotation angle signal as is; an amplifying section that amplifies the rotation angle signal a predetermined number of times; a second conversion section that converts the rotation angle signal into a rotation angle detection value based on a signal value of said amplified rotation angle signal; a selection section that selects according to a rotation angle region, either one of a rotation angle detection value converted by the first conversion section, and a rotation angle detection value converted by the second conversion section, and outputs the selected rotation angle detection value as a final rotation angle detection value; a first learning section that learns a conversion characteristic in the first conversion section, based on rotation angle detection values for where rotation angle detection signals at at least two reference rotation angles are converted by the first conversion section, and reference-rotation-angle-equivalent-values set beforehand; and a second learning section that learns, as to at least two optional rotation angles in a rotation angle region in which the rotation angle detection value of the second conversion section is selected, a conversion characteristic in said second conversion section, based on rotation angle detection values converted by said first conversion section which has been learned by said first learning section, and the signal values amplified said predetermined number of times.