Automatic calibration of speed signal scaling
First Claim
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1. A method for automatically calibrating a vehicle speed sensor signal input to an electronic control system, comprising:
- operating a vehicle at a reference speed;
measuring a speed signal pulse period generated by a vehicle speed sensor, said vehicle speed sensor operatively coupled to said vehicle;
comparing said measured speed signal pulse period to a stored set of pulse period scalings within the electronic control system;
storing a corresponding pulse period scaling in memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings.
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Abstract
A method for automatically calibrating a vehicle speed sensor signal input to an electronic control system includes operating a vehicle at a reference speed. A speed signal pulse period, generated by a vehicle speed sensor operatively coupled to the vehicle, is measured. The measured speed signal pulse period is then compared to a stored set of pulse period scalings within the electronic control system. A corresponding pulse period scaling is stored in memory if the measured speed signal pulse period matches one of the stored set of pulse period scalings.
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Citations
20 Claims
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1. A method for automatically calibrating a vehicle speed sensor signal input to an electronic control system, comprising:
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operating a vehicle at a reference speed;
measuring a speed signal pulse period generated by a vehicle speed sensor, said vehicle speed sensor operatively coupled to said vehicle;
comparing said measured speed signal pulse period to a stored set of pulse period scalings within the electronic control system;
storing a corresponding pulse period scaling in memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings. - View Dependent Claims (2, 3, 4, 5)
setting a system operation flag to a first state if said measured speed signal pulse period matches one of said stored set of pulse period scalings; and
setting said system operation flag to a second state if said measured speed signal pulse period does not match at least one of said stored set of pulse period scalings;
wherein the electronic control system is rendered operational if said system operation flag is set to said first state and the electronic control system is rendered non-operational if said system operation flag is set to said second state.
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3. The method of claim 1, further comprising determining an average speed signal pulse period generated by said vehicle speed sensor.
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4. The method of claim 1, further comprising inputting an activation code into the electronic control system, said activation code enabling a calibrating feature of the electronic control system.
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5. The method of claim 1, further comprising storing said corresponding pulse period scaling in non-volatile memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings.
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6. A storage medium encoded with a machine readable computer program code for automatically calibrating a vehicle speed sensor signal input to an electronic control system, the storage medium including instructions for causing a computer to implement a method, the method comprising:
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operating a vehicle at a reference speed;
measuring a speed signal pulse period generated by a vehicle speed sensor, said vehicle speed sensor operatively coupled to said vehicle;
comparing said measured speed signal pulse period to a stored set of pulse period scalings within the electronic control system;
storing a corresponding pulse period scaling in memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings. - View Dependent Claims (7, 8, 9, 10)
setting a system operation flag to a first state if said measured speed signal pulse period matches one of said stored set of pulse period scalings; and
setting said system operation flag to a second state if said measured speed signal pulse period does not match at least one of said stored set of pulse period scalings;
wherein the electronic control system is rendered operational if said system operation flag is set to said first state and the electronic control system is rendered non-operational if said system operation flag is set to said second state.
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8. The storage medium of claim 6, wherein said method further comprises determining an average speed signal pulse period generated by said vehicle speed sensor.
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9. The storage medium of claim 6, wherein said method further comprises inputting an activation code into the electronic control system, said activation code enabling a calibrating feature of the electronic control system.
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10. The storage medium of claim 6, wherein said method further comprises storing said corresponding pulse period scaling in non-volatile memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings.
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11. A computer data signal for automatically calibrating a vehicle speed sensor signal input to an electronic control system, the computer data signal comprising code configured to cause a processor to implement a method, the method comprising:
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operating a vehicle at a reference speed;
measuring a speed signal pulse period generated by a vehicle speed sensor, said vehicle speed sensor operatively coupled to said vehicle;
comparing said measured speed signal pulse period to a stored set of pulse period scalings within the electronic control system;
storing a corresponding pulse period scaling in memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings. - View Dependent Claims (12, 13, 14, 15)
setting a system operation flag to a first state if said measured speed signal pulse period matches one of said stored set of pulse period scalings; and
setting said system operation flag to a second state if said measured speed signal pulse period does not match at least one of said stored set of pulse period scalings;
wherein the electronic control system is rendered operational if said system operation flag is set to said first state and the electronic control system is rendered non-operational if said system operation flag is set to said second state.
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13. The computer data signal of claim 11, wherein said method further comprises determining an average speed signal pulse period generated by said vehicle speed sensor.
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14. The computer data signal of claim 11, wherein said method further comprises inputting an activation code into the electronic control system, said activation code enabling a calibrating feature of the electronic control system.
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15. The computer data signal of claim 11, wherein said method further comprises storing said corresponding pulse period scaling in non-volatile memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings.
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16. A calibration system for automatically calibrating a vehicle speed sensor signal input to an electronic control system, the calibration system comprising:
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a vehicle operated at a reference speed;
a vehicle speed sensor, operatively coupled to said vehicle, said vehicle speed sensor generating a vehicle speed signal;
a microprocessor within the electronic control system, said microprocessor receiving said vehicle speed signal, said microprocessor further measuring a speed signal pulse period;
a stored set of pulse period scalings within the electronic control system;
wherein said microprocessor compares said speed signal pulse period to said stored set of pulse period scalings, said microprocessor further storing a corresponding pulse period scaling in memory if said measured speed signal pulse period matches one of said stored set of pulse period scalings. - View Dependent Claims (17, 18, 19, 20)
said system operation flag being set to a second state if said measured speed signal pulse period does not match at least one of said stored set of pulse period scalings;
wherein the electronic control system is rendered operational if said system operation flag is set to said first state and the electronic control system is rendered non-operational if said system operation flag is set to said second state.
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18. The calibration system of claim 16, wherein said microprocessor determinines an average speed signal pulse period generated by said vehicle speed sensor.
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19. The calibration system of claim 16, wherein the electronic control module further comprises a user interface, said user interface capable of inputting an activation code into the electronic control system, said activation code thereby enabling a calibrating feature of the electronic control system.
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20. The calibration system of claim 16, wherein said memory further comprises a non-volatile memory.
Specification