METHOD, SYSTEM AND COMPUTER PROGRAM OF DETECTING A TIRE PRESSURE DEVICE

• US 20100191495A1
• Filed: 03/16/2007
• Published: 07/29/2010
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: Nira Dynamics AB
• Original Assignee: Nira Dynamics AB
• Inventors: Drevö, Markus, Lindskog, Peter, Stenman, Anders
• Granted Patent: US 10,543,769 B2
• Time in Patent Office: Days
• US Class Current: 702/98
• CPC Class Codes: B60N 2/80 Head-rests
• CPC Class Codes: G01L 27/00 Testing or calibrating of apparatus for measuring fluid pressure

Abstract

The invention is directed to a system, a method and a computer program including program code for carrying out the method, when executed on a processing system, of issuing a tire pressure deviation in a vehicle'"'"'s tire. The system comprises a calculation unit (20) adapted to calculate temporally successive output signals (WRA_x) indicative of a tire pressure condition in the vehicle'"'"'s tire on the basis of temporally successive vehicle'"'"'s signals. It further comprises a calibration unit (25) adapted to determine a calibration value (WRA_cal/X) on the basis of a number of temporally successive output signals (WRA_x) from the calculation unit (20). It further comprises a detection unit (30) configured to detect a tire pressure deviation in the vehicle'"'"'s tire on the basis of further temporally successive output signals (WRA_x) from the calculation unit (20) and the calibration value (WRA_cal/X) from the calibration unit (25), after determination of the calibration value (WRA_cal,x) by the calibration unit (25). The detection unit (30) is further configured to monitor the temporal developing of the number of temporally successive output signals (WRA_x) and to detect a pressure deviation on the basis of the temporal developing before having received the calibration value (WRA_cal,x) from the calibration unit (25).

Claims

1. A method of detecting a tire pressure deviation in a vehicle'"'"'s tire, comprising:

calculating temporally successive output signals (WRA_x) indicative of a tire pressure condition in the vehicle'"'"'s tire on the basis of temporally successive vehicle'"'"'s signals;

determining a calibration value (WRA_cal,x) on the basis of a number of temporally successive output signals (WRA_x); and

after determination of the calibration value (WRA_cal,x), detecting a tire pressure deviation in the vehicle'"'"'s tire on the basis of further temporally successive output signals (WRA_x) and the calibration value (WRA_cal,x),

characterized in that it further comprises;

before determination of the calibration value (WRA_cal,x), monitoring the temporal developing of the number of temporally successive output signals (WRA_x), and

detecting a pressure deviation on the basis of the temporal developing before having determined the calibration value (WRA_cal,x).

2. The method according to claim 1, wherein the monitoring comprises computing a gradient with respect to time of the number of temporally successive output signals (WRA_x) and comparing this gradient to a threshold in order to detect a pressure deviation.

3. The method according to claim 1, wherein the threshold is adapted according to the ambient temperature.

4. A system of issuing a tire pressure deviation in a vehicle'"'"'s tire, comprising:

a calculation unit (20) adapted to calculate temporally successive output signals (WRA_x) indicative of a tire pressure condition in the vehicle'"'"'s tire on the basis of temporally successive vehicle'"'"'s signals;

a calibration unit (25) adapted to determine a calibration value (WRA_cal,x) on the basis of a number of temporally successive output signals (WRA_x) from the calculation unit (20); and

a detection unit (30) configured to detect a tire pressure deviation in the vehicle'"'"'s tire on the basis of further temporally successive output signals (WRA_x) from the calculation unit (20) and the calibration value (WRA_cal,x) from the calibration unit (25), after determination of the calibration value by the calibration unit (25);

characterized in that

the detection unit (30) is further configured to monitor the temporal developing of the number of temporally successive output signals (WRA_x) and to detect a pressure deviation on the basis of the temporal developing before having received the calibration value (WRA_cal,x) from the calibration unit (25).

5. The system according to claim 4, wherein the detection unit (30) is configured to compute a gradient with respect to time of the number of temporally successive output signals (WRA_x) and to compare this gradient to a threshold in order to detect a pressure deviation.

6. The system according to claim 4, wherein the detection unit (30) is configured to adapt the threshold according to the ambient temperature.

7. A computer program including program code for carrying out a method, when executed on a processing system, of detecting a tire pressure deviation in a vehicle'"'"'s tire, comprising:

calculating temporally successive output signals (WRA_x) indicative of a tire pressure condition in the vehicle'"'"'s tire on the basis of temporally successive vehicle'"'"'s signals;

determining a calibration value (WRA_cal,x) on the basis of a number of temporally successive output signals (WRA_x); and

after determination of the calibration value WRA_cal,x), detecting a tire pressure deviation in the vehicle'"'"'s tire on the basis of further temporally successive output signals (WRA_x) and the calibration value (WRA_cal,x),

characterized in that it further comprises;

before determination of the calibration value WRA_cal,x), monitoring the temporal developing of the number of temporally successive output signals (WRA_x), and

detecting a pressure deviation on the basis of the temporal developing before having determined the calibration value (WRA_cal,x).