Occupant classification sensor calibration system

• US 7,457,692 B2
• Filed: 10/12/2004
• Issued: 11/25/2008
• Est. Priority Date: 10/12/2004
• Status: Expired due to Fees

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Smith, Sarah D, Carr, Kirsten M., Gaboury, Scott H.
• Primary Examiner(s): ARTHUR JEANGLAUDE, GERTRUDE
• Application Number:
  US10/711,900
• Publication Number:
  US 20060080011A1
• Time in Patent Office: 1,505 Days
• Field of Search: 701/29, 701/34, 701/45, 701 46- 47, 280/734, 280/735, 180/268, 180/270, 180/271, 180/273
• US Class Current: 701/34
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/9314 Parking operations
• CPC Class Codes: G01S 2013/9317 Driving backwards
• CPC Class Codes: G01S 2013/9321 Velocity regulation, e.g. cruise control
• CPC Class Codes: G01S 7/4004 of parts of a radar system

Abstract

A method of calibrating an occupant classification sensor (16) includes receiving a calibration signal originating from an on-board vehicle calibration device (24). A calibration task is performed that includes the initialization of an occupant classification sensor (16). A baseline is generated for the occupant classification sensor (16) in response to the calibration signal. Performance confirmation of the calibration task is indicated.

Claims

1. A method of calibrating at least one occupant classification sensor onboard a vehicle, said method comprising the steps of:

sensing physical manipulations of at least one onboard calibration device and determining whether said physical manipulations are in a predetermined order so as to initiate an onboard procedure for calibrating said at least one occupant classification sensor;

upon initiation of said onboard procedure, sensing physical manipulations of said at least one onboard calibration device and accordingly generating calibration signals;

performing at least one calibration task, including initializing and generating at least one baseline for at least one said occupant classification sensor, in response to said calibration signals; and

affirmatively indicating performance of at least one said calibration task.

2. A method as in claim 1, wherein said physical manipulations are sensed by sensors, and said calibration signals are generated by said sensors.

3. A method as in claim 1, wherein at least one said calibration task is at least partially performed by at least one controller.

4. A method as in claim 1, wherein at least one said onboard calibration device is an ignition switch, and at least some of said calibration signals are generated in response to actuation of said ignition switch.

5. A method as in claim 1, wherein at least one said onboard calibration device is a pressure-sensitive seat system, and at least some of said calibration signals are generated in response to the application of pressure on said seat system for a predetermined time period.

6. A method as in claim 1, wherein at least one said onboard calibration device is a seat belt, and at least some of said calibration signals are generated in response to buckling and unbuckling said seat belt a predetermined number of times.

7. A method as in claim 1, wherein at least one said onboard calibration device is a pressure-sensitive seat system, and at least some of said calibration signals are generated in response to the release of pressure on said seat system.

8. A method as in claim 1, wherein generating said at least one baseline is at least partially accomplished by zeroing said at least one occupant classification sensor.

9. A method as in claim 1, wherein the step of affirmatively indicating performance of at least one said calibration task is at least partially accomplished by affirmatively indicating that said onboard procedure for calibrating said at least one occupant classification sensor has been initiated.

10. A method as in claim 1, wherein the step of affirmatively indicating performance of at least one said calibration task is at least partially accomplished by affirmatively flashing an indicator lamp a predetermined number of times.

11. A method as in claim 1, said method further comprising the steps of:

generating occupant classification signals in response to said at least one baseline;

generating a calibrated output in response to said calibration signals and said occupant classification signals; and

verifying said calibrated output.

12. A method as in claim 1, wherein at least one said calibration task is performed in response to at least some of said calibration signals when received in a predetermined sequence.

13. An occupant classification system for a vehicle, said occupant classification system comprising:

at least one occupant classification sensor having at least one associated baseline and operable to generate occupant classification signals;

at least one manipulable onboard calibration device;

at least one calibration device sensor operable to generate calibration signals according to physical manipulations of said at least one onboard calibration device;

a controller coupled to each said occupant classification sensor and each said calibration device sensor and operable to receive said calibration signals, adjust each said baseline, and generate at least one calibrated output in response to said occupant classification signals and said calibration signals; and

at least one indicator coupled to said controller and operable to affirmatively indicate performance of at least one system task associated with calibrating said at least one occupant classification sensor;

wherein said controller is operable to determine whether said physical manipulations are in a predetermined order so as to initiate at least one said system task for calibrating at least one said occupant classification sensor.

14. An occupant classification system as in claim 13, wherein at least one said occupant classification sensor is selected from the group consisting of a pressure sensor, a strain gage, a piezo electric sensor, an infrared sensor, a piezo resistive sensor, and an ultrasonic sensor.

15. An occupant classification system as in claim 13, wherein at least one said baseline is selected from the group consisting of an occupant weight baseline, an occupant position baseline, an occupant present baseline, and an occupant size baseline.

16. An occupant classification system as in claim 13, wherein at least one said onboard calibration device is selected from the group consisting of a brake pedal, a gas pedal, a key cylinder, an ignition switch, a key receiver, a timer, a seat a seat belt buckle, a set belt retractor, a seat belt receiver, a seat belt buckle receiver, a seat belt anchor, a button, a switch, and a dial.

17. An occupant classification system as in claim 13, wherein at least one said indicator is selected from the group consisting of an LCD display, a monitor, an LED, a display, a dashboard vehicle system status indicator, an audio system, a video system, a heads-up display, and a lamp.

18. An occupant classification system as in claim 13, wherein said controller is operable to adjust at least one said baseline when said calibration signals are received in a predetermined sequence.

19. A countermeasure system for a vehicle, said countermeasure system comprising:

at least one collision detection sensor operable to detect an object and accordingly generate object detection signals;

at least one occupant classification sensor having at least one associated baseline and operable to generate occupant classification signals;

at least one manipulable onboard calibration device;

at least one calibration device sensor operable to generate calibration signals according to physical manipulations of said at least one onboard calibration device;

a controller coupled to each said collision detection sensor, each said occupant classification sensor, and each said calibration device sensor and operable to receive said calibration signals, adjust each said baseline, and generate at least one calibrated output in response to said occupant classification signals and said calibration signals;

at least one indicator coupled to said controller and operable to affirmatively indicate performance of at least one system task associated with calibrating said at least one occupant classification sensor; and

at least one countermeasure coupled to said controller;

wherein said controller is operable to determine whether said physical manipulations are in a predetermined order so as to initiate at least one said system task for calibrating at least one said occupant classification sensor, and said controller is operable to perform at least one said countermeasure in response to said object detection signals and at least one said calibrated output.

20. A countermeasure system as in claim 19, wherein at least one said countermeasure is a device selected from the group consisting of a pretensioner, an air bag, a knee bolster device, a head restraint device, and a load-limiting device.