Electric actuator system
AssigneeDenso Corporation
InventorsTokuhisa Takeuchi, Hiroshi Nakajima
Life of this patent
Estimating the term…
Abstract
The detection of a pulse signal in an initialization pattern is ensured regardless of the position where a DC motor is stopped. A CPU detects the pulse signal generated by the pulse generator and an angle of rotation of a rotating shaft, and controls an angle of rotation of a rotating shaft based on the detected angle of rotation. The pulse generator generates the pulse signal in the initialization pattern, which indicates the position of origin of the angle of rotation, in accordance with the rotation of the DC motor. If a determination means determines that it is impossible to detect the pulse signal in the initialization pattern when the DC motor is rotated in a first direction, the CPU rotates the DC motor in a second direction.
Claims13
An electric actuator system for rotating an electric actuator to a position of an origin of an angle of rotation to perform origin position setting for storing rotation to the position of the origin, comprising:
- an electric motor;
- a pulse generator section for generating, while the electric motor is, rotating, (i) a first pulse signal having a given pattern in accordance with the rotation of the electric motor and (ii) a second pulse signal having an initialization pattern in accordance with the rotation of the electric motor, wherein the second pulse signal is different from the given pattern of the first pulse signal and indicates reaching the position of the origin;
- control means for detecting an angle of rotation of a rotating shaft based on the first pulse signal generated from the pulse generator section and for controlling the angle of rotation of the rotating shaft at least over a control range of the angle of rotation based on the detected angle of rotation;
- determination means for determining whether it is impossible or not, to detect the second pulse signal when the electric motor is rotated to a first direction;
- and
- reversing means for rotating the electric motor to a second direction opposite to the first direction to attempt detection of the second pulse signal when the determination means determines that it is impossible to detect the second pulse signal.
Dependencies are inferred from the claim text.