# US 12,225,101 B2 · Signal correction apparatus and method of steer-by-wire system

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- Number: US 12,225,101 B2
- Document ID: US12225101B2
- Status: Granted
- Kind: B2
- Application number: 17/535,548
- Filed: 2021-11-24
- Published: 2023-01-12
- Granted: 2025-02-11
- Earliest claimed: 2021-06-11
- Assignees: Hyundai Mobis Co., Ltd.
- Applicants: Hyundai Mobis Co., Ltd.
- Inventors: Young Hwan Do; Woo Hyung Kim
- Web page: https://patentgrep.com/patent/US12225101B2

## CPC

- H04L 7/0041: {Delay of data signal}
- B62D 5/006: {power actuated}
- B62D 5/0424: {the axes of motor and final driven element of steering gear, e.g. rack, being parallel}
- B62D 5/0463: {calculating assisting torque from the motor based on driver input}
- B62D 5/0481: {monitoring the steering system, e.g. failures}
- B62D 15/025: {Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation (B62D1/28 takes precedence)}
- H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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)

## Abstract

A signal correction apparatus of an SBW system may include: a command signal receiving/transmitting unit configured to receive a command signal transmitted through a vehicle communication network by an upper level apparatus, and transmit a command signal, obtained by correcting the linearity of the received command signal, to a lower level apparatus through the vehicle communication network; a buffer unit configured to store the command signal, received through the command signal transmitting/receiving unit, as an original signal; and a control unit configured to generate a command signal whose linearity is corrected, by correcting the linearity of the original signal by using the original signal stored as the command signal in the buffer unit and a command signal obtained by delaying the command signal, stored in the buffer unit, by designated one unit time.

## Claims

### Claim 1

A signal correction apparatus of an SBW (Steer-By-Wire) system, comprising:
a command signal transceiver configured to receive a command signal transmitted through a vehicle communication network by an upper level apparatus, and transmit a command signal, obtained by correcting the linearity of the received command signal, to a lower level apparatus through the vehicle communication network;
a buffer configured to store the command signal, received through the command signal transceiver, as an original signal; and
a control circuit configured to generate a corrected command signal whose linearity is corrected by correcting a linearity of the original signal using the original signal and a delayed command signal obtained by delaying the original signal by a designated one unit time.

### Claim 2 (depends on 1)

The signal correction apparatus of claim 1, wherein the upper level apparatus transmits a command signal at an upper level through the vehicle communication network according to a designated command signal transfer system of the SBW system, and
the lower level apparatus receives a command signal at a lower level through the vehicle communication network according to the designated command signal transfer system of the SBW system.

### Claim 3 (depends on 1)

The signal correction apparatus of claim 1, further comprising a count signal transceiver configured to receive a count signal transmitted by the upper level apparatus and transmit the count signal to the lower level apparatus.

### Claim 4 (depends on 3)

The signal correction apparatus of claim 3, wherein the count signal is separately transmitted/received in synchronization with the command signal received through the vehicle communication network in order to check a period and linearity of the command signal, and constantly increased by a designated specific count value at each designated unit time in each period.

### Claim 5 (depends on 1)

The signal correction apparatus of claim 1, wherein the control circuit is configured to determine whether the linearity of the command signal received through the vehicle communication network is maintained by using a count value of a count signal.

### Claim 6 (depends on 5)

The signal correction apparatus of claim 5, wherein in order to determine whether the linearity of the command signal is maintained, the control circuit is configured to determine whether a delay or peak occurs by using a count value of a count signal in each period of a plurality of periods.

### Claim 7 (depends on 1)

The signal correction apparatus of claim 1, wherein the control circuit is configured to check a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and configured to determine that the command signal was delayed when the same count value as that in a previous period is retained in a current period.

### Claim 8 (depends on 7)

The signal correction apparatus of claim 7, wherein in response to determining the command signal is not delayed, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time of the corresponding period.

### Claim 9 (depends on 7)

The signal correction apparatus of claim 7, wherein in response to determining the command signal was delayed, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the original signal of the corresponding period.

### Claim 10 (depends on 1)

The signal correction apparatus of claim 1, wherein the control circuit is configured to check a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and configured to determine that the command signal was delayed when a count value which has doubled from that in a previous period is detected in a current period.

### Claim 11 (depends on 10)

The signal correction apparatus of claim 10, wherein in response to determining no peak occurs in the command signal, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period.

### Claim 12 (depends on 10)

The signal correction apparatus of claim 10, wherein in response to determining a peak occurred in the command signal, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using a half of an increase of the original signal in a corresponding period.

### Claim 13

A signal correction method of an SBW system, comprising:
receiving, by a control circuit of a signal correction apparatus of an SBW system, a command signal from an upper level apparatus;
storing, by the control circuit, the command signal as an original signal in a buffer;
determining, by the control circuit, whether the linearity of the command signal is maintained; and
generating, by the control circuit, a corrected command signal whose linearity is corrected by correcting a linearity of the original signal using the original signal and a delayed command signal obtained by delaying the original signal by a designated one unit time in response to determining the linearity of the command signal is not maintained.

### Claim 14 (depends on 13)

The signal correction method of claim 13, wherein in the determining of whether the linearity of the command signal is maintained, the control circuit checks a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and determines that the command signal was delayed when the same count value as that in a previous period is retained in a current period.

### Claim 15 (depends on 13)

The signal correction method of claim 13, wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period in response to determining the command signal is not delayed.

### Claim 16 (depends on 13)

The signal correction method of claim 13, wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the original signal of a corresponding period, in response to determining the command signal was delayed.

### Claim 17 (depends on 13)

The signal correction method of claim 13, wherein in the determining of whether the linearity of the command signal is maintained, the control circuit checks a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and determines that the command signal was delayed in response to determining a count value which has doubled from that in a previous period is detected in a current period.

### Claim 18 (depends on 13)

The signal correction method of claim 13, wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period in response to determining no peak occurs in the command signal.

### Claim 19 (depends on 13)

The signal correction method of claim 13, wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using a half of an increase of the original signal of a corresponding period in response to determining a peak occurred in the command signal.