US6029496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for automatic calibration of an odometer
Assignee: Robert Bosch GmbH
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Filing: 1997-06-21
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Granted: 2000-02-29
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Expires: 2017-06-21
Abstract
Abstract A location system for a motor vehicle in which the calibration of a displacement sensor is performed with the aid of satellite signals. A Global Positioning System (GPS) receiver may be used, and the current vehicle speed within a time segment is calculated using the Doppler method. The distance traveled is ascertained from the vehicle speed. By taking a mean, calculating the dispersion, and performing a weighting, a very accurate reference value for calibration of the displacement sensor is achieved.
Inventors
- 👤 Peter Kreft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:38
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/28; G01C22/00; G01C22/02; G01C25/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A method for automatically calibrating a displacement sensor of a vehicle, comprising the steps of: counting signals from the displacement sensor for a sequence of respective time periods, the signals from the displacement sensor representing a distance traveled; continuously ascertaining speeds of the vehicle via reception of broadcast signals and via the Doppler effect, the ascertained speeds being associated with the sequence of respective time periods; forming quotients from products of the ascertained speeds associated with each of the respective time periods, and a number of the signals from the displacement sensor counted in each of the respective time periods; multiplying each of the quotients by a respective weighting factor; determining a mean from the weighted quotients; and calibrating the displacement sensor as a function of the mean.
Claim 2
Independent Claim
128 words
A method for automatically calibrating a displacement sensor of a vehicle, comprising the steps of: counting signals from the displacement sensor for a sequence of respective time periods, the signals from the displacement sensor representing a distance traveled; continuously ascertaining speeds of the vehicle via reception of broadcast signals and via the Doppler effect, the ascertained speeds being associated with the sequence of respective time periods; forming quotients from products of the ascertained speeds associated with each of the respective time periods, and a number of the signals from the displacement sensor counted in each of the respective time periods; multiplying each of the quotients by a respective weighting factor; determining a mean from the weighted quotients; and calibrating the displacement sensor as a function of the mean.
Claim 3
Dependent Claim
16 words
The method according to claim 1, wherein the broadcast signals are from a global positioning system.
Claim 4
Dependent Claim
27 words
The method according to claim 1, further comprising the step of: correlating and comparing the signals from the displacement sensor with the ascertained speeds of the vehicle.
Claim 5
Dependent Claim
24 words
The method according to claim 1, wherein each respective weighting factor of each of the quotients depends on a mean error of the quotient.
Claim 6
Dependent Claim
27 words
The method according to claim 1, further comprising the steps of: calculating each respective weighting factor iteratively; and allocating a fixed value to one respective weighting factor.
Claim 7
Dependent Claim
12 words
The method according to claim 5, wherein the fixed value is 1.
Claim 8
Dependent Claim
40 words
The method according to claim 5, further comprising the step of: calculating a ratio between two respective weighting factors from a reciprocal ratio of squares of mean errors of the quotients with which the two respective weighting factors are associated.
Claim 9
Dependent Claim
18 words
The method according to claim 1, wherein the mean is calculated by arithmetic averaging of the weighted quotients.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-28 | 2003-08-30 | 2004-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-28 | 2007-08-30 | 2008-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-28 | 2011-08-30 | 2012-02-29 | $7700.00 | Window Closed / Lapsed |