# US 2014/0207329 A1 · Method and apparatus for determining tire condition and location using wheel speed sensors and acceleration sensors

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- Number: US 2014/0207329 A1
- Document ID: US20140207329A1
- Status: Published application
- Kind: A1
- Application number: 13/749,128
- Filed: 2013-01-24
- Published: 2014-07-24
- Earliest claimed: 2013-01-24
- Assignees: TRW Automotive U.S. LLC
- Applicants: Trw Automotive U.S. LLC
- Inventors: David L. Juzswik
- Web page: https://patentgrep.com/patent/US20140207329A1

## CPC

- B60C 23/0447: {Wheel or tyre mounted circuits}
- B60C 23/0408: {transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver}
- B60C 23/0416: {allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right}
- B60C 23/0489: {for detecting the actual angular position of the monitoring device while the wheel is turning}
- B60C 23/0438: {comprising signal transmission means, e.g. for a bidirectional communication with a corresponding wheel mounted receiver}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

A tire condition sensing apparatus includes a tire-based sensor for sensing two relative rotational positions of its associated tire relative to the earth's horizon as the tire rotates and provides first and second signals indicative thereof. A transmitter for transmits tire condition information and a signal processing time delay value in response to the first and second signals. A vehicle-based sensor monitors tire rotation relative to the vehicle's chassis and provides a signal indicative thereof. A controller for monitors the transmitted tire condition information signal, the signal processing time delay value, and the signal from the vehicle-based sensor and associates tire location in response thereto.

## Claims

### Claim 1

A tire condition sensing apparatus comprising:
a tire-based sensor for sensing two relative rotational positions of its associated tire relative to the earth's horizon as the tire rotates and providing first and second signals indicative thereof;
transmitter for transmitting a tire identification, tire condition information, and a processing time delay value in response to each of said first and second signals;
a vehicle-based sensor for monitoring tire rotation relative to the vehicle's chassis and providing a signal indicative thereof; and
a controller for monitoring the transmitted tire identification signal, the processing time delay value, and the signal from the vehicle-based sensor and associating tire identification with a tire location in response thereto.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein the tire-based sensor senses two relative rotational position that are 180 degrees apart.

### Claim 3 (depends on 1)

The apparatus of claim 1 wherein the tire-based sensor includes an accelerometer used for sensing the relative rotational positions.

### Claim 4 (depends on 1)

The apparatus of claim 1 wherein said vehicle-based sensor includes a toothed disc mounted for rotation with the tire and an inductive sensor mounted adjacent the toothed disc and inductively coupled thereto.

### Claim 5

A method for sensing condition of a tire comprising the steps of:
sensing two relative rotational positions of the tire relative to the earth's horizon as the tire rotates using sensors and providing first and second signals indicative thereof;
transmitting tire identification, tire condition information, and a signal processing time delay value using a transmitter in response to said first and second signals;
monitoring tire rotation relative to the vehicle's chassis using a vehicle-based sensor and providing a signal indicative thereof; and
monitoring the transmitted tire identification, the signal processing time delay value, and the signal indicative of the tire rotation relative to the vehicle's chassis using a controller, said controller associating tire identification with a tire location in response thereto.

### Claim 6

A tire condition sensing apparatus comprising:
a toothed disc mounted for rotation with a vehicle tire;
a disc rotation sensor for providing a pulse signal each time a disc tooth passes the disc rotation sensor;
an acceleration sensor mounted for rotation with the tire for producing a sinusoidal signal as the tire rotates through the earth's gravitation field;
a tire-based controller for processing the acceleration signal to determine two predetermined locations of the sensor relative to the earth's horizon as the tire rotates and determine any time delay in performing said processing;
a sensor for sensing the tire condition;
a transmitter for transmitting a message packet when the tire-based controller determines the acceleration sensor is at the predetermined locations relative to the earth's horizon along with any determined time delay;
a vehicle-based controller for monitoring the disc rotation sensor and the transmitted message packets and correlating an angular position of the disc in response to the transmitted message packets.

### Claim 7 (depends on 6)

The tire condition sensing apparatus of claim 6 further including a low pass filter for filtering the signal from the acceleration sensor, a vehicle speed sensor, and wherein the tire-based controller adjusts the operation of the low pass filter in response to sensed vehicle speed.