ROTATIONAL ANGLE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM
First Claim
1. A rotational angle detection device, comprising:
- a rotational angle sensor that outputs a sine signal and a cosine signal of which output levels are changed in accordance with a rotational angle of a detection target;
a first rotational angle detector that detects the rotational angle based on the sine signal and the cosine signal;
a pulse signal generator that generates, based on the sine signal and the cosine signal, three-phase pulse signals that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles do not overlap each other and are at regular intervals; and
a second rotational angle detector that detects the rotational angle based on the pulse signals.
1 Assignment
0 Petitions
Accused Products
Abstract
An ECU detects a steering angle that is an absolute angle based on a sine signal and a cosine signal that are output from a steering sensor. The ECU includes a three-phase pulse generator that generates, based on the sine signal and the cosine signal, three-phase pulse signals that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles corresponding to the respective edges do not overlap each other and are at regular intervals. A microcomputer has a function as a second rotational angle detector that calculates a steering angle based on the pulse signals.
-
Citations
16 Claims
-
1. A rotational angle detection device, comprising:
-
a rotational angle sensor that outputs a sine signal and a cosine signal of which output levels are changed in accordance with a rotational angle of a detection target; a first rotational angle detector that detects the rotational angle based on the sine signal and the cosine signal; a pulse signal generator that generates, based on the sine signal and the cosine signal, three-phase pulse signals that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles do not overlap each other and are at regular intervals; and a second rotational angle detector that detects the rotational angle based on the pulse signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification