Rotation angle detector

Patent metadata

Field	Value
Publication number	US-2016339958-A1
Application number	US-201615158232-A
Country	US
Kind code	A1
Filing date	May 18, 2016
Priority date	May 20, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

A rotation angle detector includes a voltage detector receiving a supply of voltage from a first power source and detecting a motor rotation regarding a motor, the motor rotation more specifically detected as (i) a rotation angle of the motor and (ii) a number of rotations of the motor. Also, a second power source is disposed separately from the first power source and supplying voltage to the voltage detector. Thus, even when the voltage of the in-vehicle battery lowers or the voltage supply therefrom is interrupted, the voltage supply to a voltage detector is continuous from the power storage device, thereby enabling a continuous detection of the rotation angle and the rotation number of the motor.

First claim

What is claimed is:

1 . A rotation angle detector comprising:
a voltage detector receiving a supply of voltage from a first power source and detecting a motor rotation regarding a motor, the motor rotation more specifically detected as (i) a rotation angle of the motor and (ii) a number of rotations of the motor; and a second power source disposed separately from the first power source and supplying voltage to the voltage detector.

2 . The rotation angle detector of claim 1 , wherein
the voltage detector includes:
a rotation angle voltage detector (i) receiving a supply of voltage from the first power source when a power switch is turned ON, and (ii) detecting (a) the rotation angle of the motor or (b) information corresponding to the rotation angle of the motor; and
a rotation number voltage detector (i) receiving a supply of voltage from the first power source regardless of an ON position or an OFF position of the power switch, and (ii) detecting the number of rotation of the motor, and
the second power source supplies voltage to the rotation number detection unit.

3 . The rotation angle detector of claim 1 , wherein
the second power source is a chargeable power source, and a charger is provided (i) to supply an electric power from the first power source to the second power source, and (ii) to charge the second power source.

4 . The rotation angle detector of claim 3 , wherein
the first power source is a chargeable power source, and the charger charges the second power source when the charger is charging the first power source by supplying an electric power from an external power source to the first power source.

5 . The rotation angle detector of claim 4 , wherein
the charger refrains from charging the second power source when the charger is not charging the first power source by a supply of an electric power from the external power source to the first power source.

6 . The rotation angle detector of claim 1 , wherein
the second power source has an electric power storage capacity that enables a continuous voltage supply to the rotation number detection unit for a preset time period, even when the voltage of the first power source lowers, or the voltage supply from the first power source is interrupted.

7 . The rotation angle detector of claim 6 , wherein
the electric power storage capacity of the second power source is configured to enable a continuous voltage supply to the rotation number detection unit for a required time period that is required for a replacement of the first power source.

8 . The rotation angle detector of claim 1 , wherein
the second power source is provided as plural sources, and the plural sources respectively supply voltage separately to the rotation number detection unit.

9 . The rotation angle detector of claim 1 , wherein
the second power source is a battery or a capacitor.

10 . The rotation angle detector of claim 1 , wherein
the motor rotates a rotation object that is a part of a steering system.

11 . A steering system, comprising:
a rotation angle detector, the rotation angle detector having:
a voltage detector receiving a supply of voltage from a first power source and detecting a motor rotation regarding a motor, the motor rotation more specifically detected as (i) a rotation angle of the motor and (ii) a number of rotations of the motor; and
a second power source disposed separately from the first power source and supplying voltage to the voltage detector.

Assignees

• Denso Corp

Inventors

• Fujita Toshihiro
• Kabune Hideki

Classifications

• B62D15/0235 Primary

  by measuring or deriving directly at the electric power steering motor · CPC title

• B62D15/021

  Determination of steering angle · CPC title

• G01D5/145

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• B60R16/03

  for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)} · CPC title