# US 12,007,294 B2 · Operation processing apparatus, angle sensor and power steering apparatus

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- Number: US 12,007,294 B2
- Document ID: US12007294B2
- Status: Granted
- Kind: B2
- Application number: 17/152,063
- Filed: 2021-01-19
- Published: 2021-05-13
- Granted: 2024-06-11
- Earliest claimed: 2017-11-27
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Shinichirou Mochizuki; Hiraku Hirabayashi
- Web page: https://patentgrep.com/patent/US12007294B2

## CPC

- G01L 3/10: involving electric or magnetic means for indicating
- B62D 15/0235: {by measuring or deriving directly at the electric power steering motor}
- G01D 5/14: influencing the magnitude of a current or voltage
- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- B62D 5/0403: {characterised by constructional features, e.g. common housing for motor and gear box}
- G01B 7/30: for measuring angles or tapers; for testing the alignment of axes
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

An operation processing apparatus that calculates a rotation angle based on a first output signal and a second output signal, which differ in signal frequency from each other, is provided with a first cross-coupled operation part that performs a first cross-coupled operation and a second cross-coupled operation part that performs a second cross-coupled operation based on the first and second output signals. A first Lissajous curve generation part generates a first Lissajous curve based on the result of operation by the first cross-coupled operation part, and a second Lissajous curve generation part generates a second Lissajous curve based on the result of operation by the second cross-coupled operation part. A rotation angle computing part calculates the rotation angle based on the first Lissajous curve and the second Lissajous curve.

## Claims

### Claim 1

An operation processing apparatus that calculates a physical quantity based on a first output signal that is output from a first sensor element and a second output signal that is output from a second sensor element, wherein
the first output signal has a different signal frequency from the second output signal,
the first output signal includes a first sine signal and a first cosine signal,
the second output signal includes a second sine signal that is different in frequency from the first sine signal and a second cosine signal that is different in frequency from the first cosine signal, and
the operation processing apparatus comprises:
a first cross-coupled operation part;
a second cross-coupled operation part;
a first Lissajous curve generation part that generates a first Lissajous curve;
a second Lissajous curve generation part that generates a second Lissajous curve; and
a physical quantity computing part that calculates the physical quantity based on the first Lissajous curve and the second Lissajous curve, wherein
the first cross-coupled operation part is configured to perform an addition process of adding the first sine signal and the second cosine signal and a subtraction process of subtracting the second sine signal from the first cosine signal to generate a first signal,
the second cross-coupled operation part is configured to perform an addition process of adding the first sine signal and the second sine signal and an addition process of adding the first cosine signal and the second cosine signal to generate a second signal,
the first Lissajous curve generation part is configured to generate the first Lissajous curve using the first signal, and
the second Lissajous curve generation part is configured to generate the second Lissajous curve using the second signal.

### Claim 2 (depends on 1)

The operation processing apparatus according to claim 1, wherein
the first Lissajous curve and the second Lissajous curve are shifted from each other substantially by a π/2 cycle.