US5699253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear dynamic transform for correction of crankshaft acceleration having torsional oscillations
Assignee: Ford Global Technologies LLC
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Filing: 1995-04-05
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Granted: 1997-12-16
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Expires: 2015-04-05
Abstract
Abstract Irregularities in crankshaft velocity introduced when measuring crankshaft rotation at a section of a crankshaft in an internal combustion engine that is less damped to torsional oscillations than is another more accessible crankshaft section are corrected by performing a nonlinear transformation via a neural network to predict rotation measurements that would have been obtained at the inaccessible section from data actually collected at the accessible crankshaft section. Thus, the effects of torsional oscillations in the crankshaft are substantially filtered away, resulting in crankshaft acceleration values that form the basis of a misfire detector having nearly maximum signal-to-noise performance.
Inventors
- 👤 Gintaras Vincent Puskorius
- 👤 Lee Albert Feldkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/11; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1432; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1012; F02D2200/1015
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
132 words
A method for obtaining corrected rotation quantities in a misfire detector for an internal combustion engine, said engine having a crankshaft with a first crankshaft section being damped with respect to torsional oscillations, said engine further having a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section, said method comprising the steps of: measuring rotation quantities corresponding to individual cylinder events during operation of said engine; correcting said measured rotation quantities to remove periodic position irregularities; applying a nonlinear transform to said corrected measured rotation quantities to estimate acceleration values occurring at said first crankshaft section; and detecting misfire using said estimated rotation quantities.
Claim 2
Independent Claim
132 words
A method for obtaining corrected rotation quantities in a misfire detector for an internal combustion engine, said engine having a crankshaft with a first crankshaft section being damped with respect to torsional oscillations, said engine further having a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section, said method comprising the steps of: measuring rotation quantities corresponding to individual cylinder events during operation of said engine; correcting said measured rotation quantities to remove periodic position irregularities; applying a nonlinear transform to said corrected measured rotation quantities to estimate acceleration values occurring at said first crankshaft section; and detecting misfire using said estimated rotation quantities.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said rotation quantities are comprised of acceleration between successive rotation intervals of said crankshaft.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said nonlinear transform is comprised of a neural network.
Claim 5
Dependent Claim
141 words
Engine apparatus for detecting misfires comprising: a crankshaft with a first crankshaft section being damped with respect to torsional oscillations created during engine rotation; a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section; a timer coupled to said crankshaft position sensor measuring rotation intervals corresponding to individual cylinder events during engine rotation; a processor coupled to said timer generating rotation quantities corrected for periodic position irregularities in said measured rotation intervals; a transformer coupled to said processor estimating said corrected rotation quantities occurring at said first crankshaft section; and a misfire detector coupled to said transformer for detecting misfires of said individual cylinder events in response to said estimated corrected rotation quantities.
Claim 6
Dependent Claim
141 words
Engine apparatus for detecting misfires comprising: a crankshaft with a first crankshaft section being damped with respect to torsional oscillations created during engine rotation; a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section; a timer coupled to said crankshaft position sensor measuring rotation intervals corresponding to individual cylinder events during engine rotation; a processor coupled to said timer generating rotation quantities corrected for periodic position irregularities in said measured rotation intervals; a transformer coupled to said processor estimating said corrected rotation quantities occurring at said first crankshaft section; and a misfire detector coupled to said transformer for detecting misfires of said individual cylinder events in response to said estimated corrected rotation quantities.
Claim 7
Dependent Claim
16 words
The engine apparatus of claim 4 wherein a flywheel is mounted at said first crankshaft section.
Claim 8
Dependent Claim
59 words
The engine apparatus of claim 4 further comprising an engine assembly, wherein said first crankshaft section is disposed at a first end of said engine assembly and has a flywheel mounted thereto, and wherein said crankshaft position sensor includes an encoder wheel mounted at said second crankshaft section which is disposed at a second end of said engine assembly.
Claim 9
Dependent Claim
45 words
The engine apparatus of claim 4 wherein said transformer is comprised of a neural network having a predetermined configuration determined in a training procedure to model a nonlinear transformation relating the position of said second crankshaft section to the position of said first crankshaft section.
Claim 10
Dependent Claim
15 words
The engine apparatus of claim 4 wherein said rotation quantities are comprised of crankshaft acceleration.
References Cited (Backward Citations)
US4494509A
Cited
US5041976A
Cited
US5359518A
Cited
US5361213A
Cited
US5056360A
Cited
US5117681A
Cited
US5313826A
Cited
US5269178A
Cited
US5379634A
Cited
US5313407A
Cited
US5193513A
Cited
US5497328A
Cited
US5452604A
Cited
US5377537A
Cited
US5495415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-15 | 2001-06-16 | 2001-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-15 | 2005-06-16 | 2005-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-15 | 2009-06-16 | 2009-12-16 | $7700.00 | Window Closed / Lapsed |