Method of checking the functional reliability of a pressure sensor

• US 6,877,357 B2
• Filed: 09/24/2002
• Issued: 04/12/2005
• Est. Priority Date: 03/13/2002
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Herrmann, Thomas, Balzer, Knut
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): FITZGERALD, JOHN P
• Application Number:
  US10/477,870
• Publication Number:
  US 20040134256A1
• Time in Patent Office: 931 Days
• Field of Search: 73/17.1, 73/15.9, 702/116, 702/138, 340/436
• US Class Current: 73/1.71
• CPC Class Codes: G01L 27/007 Malfunction diagnosis, i.e. diagnosing a sensor defect

Abstract

A method of checking the functional reliability of a pressure sensor, the air pressure being detected inside a vehicle body part, the vehicle having at least one additional pressure sensor for detecting the air pressure. With the help of the method, it may be possible to determine the integrity of the sensor without requiring any additional auxiliary equipment. To do so, the measured values of the pressure sensor and the measured values of the at least one additional pressure sensor are compared over a defined observation period. The pressure sensor is recognized as being defective if its measured values deviate by more than a predefined amount from the measured values of the at least one additional pressure sensor.

Claims

1. A method of checking functional reliability of a pressure sensor which detects air pressure inside a vehicle body part, the vehicle having at least one additional pressure sensor for detecting the air pressure, comprising:

comparing measured values of the pressure sensor and measured values of the at least one additional pressure sensor over a defined observation period; and

recognizing the pressure sensor as being defective if the measured values of the pressure sensor deviate by more than a predefined amount from the measured values of the at least one additional pressure sensor;

wherein the pressure sensor is configured to detect a vehicle collision, the vehicle collision being a side impact, and wherein a decision regarding deployment of a restraint arrangement is made independently of the measured values of the pressure sensor if the pressure sensor has been recognized as being defective.

2. The method as recited in claim 1, further comprising:

situating the additional pressure sensor in a vehicle body part different from the vehicle body part in which the pressure sensor is provided.

3. The method as recited in claim 1, wherein the measured values of the pressure sensor are utilized multiple times, as part of one of passenger protection, air conditioning in an interior of the vehicle and an automotive weather station.

4. The method as recited in claim 1, further comprising:

displaying the measured values of the pressure sensor via a driver information system.

5. The method as recited in claim 1, further comprising:

situating the additional pressure sensor in a vehicle body part different from the vehicle body part in which the pressure sensor is provided, and situating the pressure sensor in a vehicle door and configuring the pressure sensor to detect a side impact.

6. The method as recited in claim 5, wherein the measured values of the pressure sensor are utilized multiple times, as part of one of passenger protection, air conditioning in an interior of the vehicle and an automotive weather station.

7. The method as recited in claim 5, further comprising:

displaying the measured values of the pressure sensor via a driver information system.

8. The method as recited in claim 1, further comprising:

situating the additional pressure sensor in a vehicle door on a same side of the vehicle as the pressure sensor or on another side of the vehicle as the pressure sensor;

situating the pressure sensor in a vehicle door and configuring the pressure sensor to detect a side impact; and

displaying the measured values of the pressure sensor via a driver information system.

9. The method as recited in claim 8, wherein the measured values of the pressure sensor are utilized multiple times, as part of one of passenger protection, air conditioning in an interior of the vehicle and an automotive weather station.

10. The method as recited in claim 8, further comprising:

displaying the measured values of the pressure sensor via a driver information system.

11. The method as recited in claim 1, further comprising:

situating the pressure sensor in a vehicle door and configuring the pressure sensor to detect a side impact.

12. The method as recited in claim 11, further comprising:

situating the additional pressure sensor in a vehicle door on a same side of the vehicle as the pressure sensor or on another side of the vehicle as the pressure sensor.