Method of detecting improper mounting of acceleration sensors on a vehicle

• US 20030016124A1
• Filed: 02/21/2002
• Published: 01/23/2003
• Est. Priority Date: 07/17/2001
• Status: Active Grant

• Current Assignee: Robert Bosch Corporation (Robert Bosch GmbH)
• Original Assignee: Robert Bosch Corporation (Robert Bosch GmbH)
• Inventors: Schmidt, Joachim, Stuetzler, Frank-Juergen
• Granted Patent: US 6,670,888 B2
• Time in Patent Office: Days
• US Class Current: 340/425.5
• CPC Class Codes: B60R 2021/01006 Mounting of electrical components in vehicles
• CPC Class Codes: B60R 2021/0117 Noise
• CPC Class Codes: B60R 21/01 Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343
• CPC Class Codes: B60R 21/01336 using filtering

Abstract

A method of detecting the improper mounting of a sensor on a motor vehicle includes monitoring the output signals of the sensor, determining the noise levels in the output signals, and comparing the noise levels from the output signals to a threshold noise value to determine if the sensor is properly mounted. Preferably, the method monitors the output signals of a first sensor and a second sensor, determines the noise levels in the output signals being emitted by each of the sensors, and compares the noise levels of the first sensor to the noise levels of the second sensor to determine if the sensors are properly mounted.

Claims

1. A method of detecting improper mounting of a sensor on a motor vehicle, the sensor emitting output signals, the method comprising:

monitoring the output signals of the sensor;

determining noise levels in the output signals; and

comparing the noise levels from the output signals of the sensor to a threshold noise value to determine if the sensor is properly mounted.

2. The method of claim 1, wherein the threshold noise value is predetermined based on vehicle characteristics.

3. The method of claim 1, wherein the threshold noise value is determined from another sensor mounted on the vehicle.

4. The method of claim 1, further comprising:

issuing a warning when the noise levels exceed the threshold noise value.

5. The method of claim 4, wherein the warning is an activation of a light in a passenger compartment of the vehicle.

6. The method of claim 1, further comprising:

incrementing a counter each time the threshold value is exceeded; and

;

issuing a warning when the counter is incremented a predetermined number of times.

7. The method of claim 1, wherein the sensor is an acceleration sensor that emits acceleration signals.

8. A method of detecting improper mounting of a sensor on a motor vehicle, the motor vehicle having a first sensor and a second sensor that each emit output signals, the method comprising:

monitoring the output signals of the sensors;

determining the noise levels in the output signals being emitted by each of the sensors; and

comparing the noise levels of the first sensor to the noise levels of the second sensor to determine if the sensors are properly mounted.

9. The method of claim 8, wherein the vehicle has a longitudinal axis and wherein comparing the noise levels of the sensors includes comparing the noise levels of two sensors that are positioned in substantially mirrored relation with respect to the longitudinal axis.

10. The method of claim 8, further comprising:

issuing a warning when a sensor is determined to be improperly mounted.

11. The method of claim 10, wherein the warning is an activation of a light in a passenger compartment of the vehicle.

12. The method of claim 8, wherein comparing the noise levels includes:

comparing the noise levels of the first sensor to a predetermined threshold value and incrementing a first counter when the threshold value is exceeded;

comparing the noise levels of the second sensor to a predetermined threshold value and incrementing a second counter when the threshold value is exceeded; and

comparing the first and second counters to determine whether one of the sensors may be improperly mounted.

13. The method of claim 12, wherein the predetermined threshold value is adjustable based on vehicle characteristics.

14. The method of claim 8, wherein determining the noise levels in the output signals of the sensors includes filtering the signals.

15. The method of claim 14, wherein the signals are filtered using a band-pass filter.

16. The method of claim 14, wherein the signals are filtered using a high-pass filter.

17. The method of claim 14, wherein determining the noise levels in the output signals further includes integrating the filtered output signals.

18. The method of claim 8, wherein the vehicle has a longitudinal axis and wherein comparing the noise levels of the sensors includes comparing the noise levels of two sensors that are not positioned in substantially mirrored relation with respect to the longitudinal axis, the method further comprising:

prior to comparing the noise levels, substantially equalizing the noise levels of the two sensors using correction factors, the correction factors being determined such that under normal driving conditions, the noise levels of the two sensors will be substantially equal.

19. The method of claim 8, wherein the sensors are acceleration sensors that emit acceleration signals.

20. A method of detecting improper mounting of an acceleration sensor on a motor vehicle, the motor vehicle having a first acceleration sensor and a second acceleration sensor that each emit acceleration signals, the method comprising:

monitoring the acceleration signals of the sensors;

determining the noise levels in the acceleration signals being emitted by each sensor;

comparing the noise levels of the first sensor to the noise levels of the second sensor to determine if the sensors are properly mounted, comparing the noise levels including;

comparing the noise levels of the first sensor to a predetermined threshold value and incrementing a first counter when the threshold value is exceeded;

comparing the noise levels of the second sensor to a predetermined threshold value and incrementing a second counter when the threshold value is exceeded; and

comparing the first and second counters to determine whether one of the sensors may be improperly mounted; and

issuing a warning when a sensor is determined to be improperly mounted.

21. The method of claim 20, wherein determining the noise levels in the acceleration signals of the sensors includes filtering the signals.

22. The method of claim 20, wherein the predetermined threshold is adjustable based on vehicle characteristics.