TIRE PRESSURE MONITORING WITH AUTO-SCALING PRESSURE RESOLUTION

• US 20140245825A1
• Filed: 03/03/2014
• Published: 09/04/2014
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Inventors: McIntyre, Matthew D., Deniau, Jean-Christophe, Farrell, Brian, Gad, Yasser
• Granted Patent: US 10,359,331 B2
• Time in Patent Office: Days
• US Class Current: 73/146.3
• CPC Class Codes: B60C 23/0474 Measurement control, e.g. setting measurement rate or calibrating of sensors; Further processing of measured values, e.g. filtering, compensating or slope monitoring
• CPC Class Codes: B60C 23/0477 Evaluating waveform of pressure readings
• CPC Class Codes: G01L 17/00 Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies

Abstract

The present disclosure relates to methods, system and devices for monitoring tire pressure data of vehicle wheel units. In an example a method of monitoring and expressing tire pressure data information is provided. The method includes selecting a first threshold pressure value for a tire to establish a first pressure range and a second pressure range. The method also includes monitoring pressure of the tire and generating signals indicative of tire pressure. The method further includes that in the first pressure range the signals are converted to digital signals according to a first conversion variable and in the second pressure range the signals are converted according to a second conversion variable.

Claims

1. A method of monitoring and expressing tire pressure data information, comprising the steps of:

selecting a first threshold pressure value for a tire to establish a first pressure range and a second pressure range;

monitoring pressure of the tire and generating signals indicative of tire pressure;

wherein in the first pressure range the signals are converted according to a first conversion variable and in the second pressure range the signals are converted according to a second conversion variable.

2. The method as described in claim 1, wherein once the tire pressure passes the first threshold pressure the signals are continually converted according to the second conversion variable until the tire pressure passes a second threshold pressure.

3. The method as described in claim 1, wherein the first conversion variable includes a first scaling factor and the second conversion variable includes a second scaling factor, the second scaling factor being greater than the first scaling factor.

4. The method as described in claim 1, wherein at least one of the first conversion variable and the second conversion variable includes an offset.

5. The method as described in claim 1, wherein at least one of the first conversion variable and the second conversion variable includes a scaling factor and an offset.

6. The method as described in claim 1, wherein the signals transmitted to the tire pressure monitoring system include an indication of whether the signals indicative of tire pressure are converted in one of the first pressure range and the second pressure range.

7. A tire pressure monitoring wheel unit, comprising:

a pressure sensor configured for monitoring tire pressure and generating signals indicative thereof;

a processing unit and memory device including suitable software for;

defining a first pressure range and a second pressure range, and

determining whether the tire pressure sensed by the pressure sensor triggers the first pressure range or the second pressure range,

wherein in the first pressure range the signals are converted according to a first conversion variable and in the second pressure range the signals are converted according to a second conversion variable; and

a wireless transmitter configured to transmit the converted signals.

8. The wheel unit as described in claim 7, wherein the processor is configured to continually convert the signals according to the second conversion variable once the tire pressure triggers the second pressure range and until the tire pressure triggers the first pressure range.

9. The wheel unit as described in claim 7, wherein the first conversion variable includes a first scaling factor and the second conversion variable includes a second scaling factor, the second scaling factor being greater than the first scaling factor.

10. The wheel unit as described in claim 7, wherein at least one of the first conversion variable and the second conversion variable includes at least one of a scaling factor and an offset.

11. The wheel unit as described in claim 7, wherein the transmitter transmits an indication of whether the signals indicative of tire pressure are converted in one of the first pressure range and the second pressure range.

12. A computer-readable memory device storing computer program instructions which when executed by a computer comprising at least one processor result in:

determining whether a measured pressure triggers a first pressure range or a second pressure range; and

if the first pressure range is triggered, converting the measurement data according to a first conversion variable, and if the second pressure range is triggered, converting the measurement data by a second conversion variable, the second conversion variable being different from the first conversion variable.

13. A computer-readable memory device as described in claim 12, wherein the program instructions when executed by a computer comprising at least one processor further result in, once the pressure triggers the second pressure range, the signals being continually converted according to the second conversion variable until the tire pressure triggers the first pressure range, and thereafter the signals being converted according to the first conversion variable.

14. A computer-readable memory device as described in claim 12, wherein the first conversion variable includes a first scaling factor and the second conversion variable includes a second scaling factor, the first and the second scaling factors being different.

15. A computer-readable memory device as described in claim 12, wherein the second conversion variable includes an offset.

16. The computer-readable memory device as described in claim 12, wherein the program instructions when executed by a computer comprising at least one processor further result in transmitting the converted signals to a control unit of a tire pressure monitoring system, and wherein the signals transmitted to the tire pressure monitoring system include an indication of whether signals indicative of tire pressure are converted in one of the first range and the second range.

17. A tire pressure monitoring system in a vehicle, comprising:

a pressure sensor configured for monitoring tire pressure and generating signals indicative thereof;

a processing unit and memory device including suitable software for;

defining a first pressure range and a second pressure range,

determining whether the tire pressure measured by the pressure sensor triggers the first pressure range or second pressure range,

wherein in the first pressure range the signals are converted according to a first conversion variable and in the second pressure range the signals are converted according to a second conversion variable;

a wireless transmitter configured to transmit the converted the signals; and

a tire pressure monitoring system control unit configured to receive the converted signals from the transmitter.

18. The tire pressure monitoring system in a vehicle as described in claim 17, wherein once the tire pressure triggers the second pressure range the processor continually converts the signals according to the second conversion variable until the tire pressure triggers the second pressure range.

19. The tire pressure monitoring system in a vehicle as described in claim 17, wherein the first conversion variable includes a first scaling factor and the second conversion variable includes a second scaling factor, the second scaling factor being different than the first scaling factor.

20. The tire pressure monitoring system in a vehicle as described in claim 17, wherein at least one of the first conversion variable and the second conversion variable includes at least one of a scaling factor and an offset.