US5587524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Misfire detection assembly
Assignee: Ford Global Technologies LLC
•
Filing: 1995-05-03
•
Granted: 1996-12-24
•
Expires: 2015-05-03
Abstract
Abstract A misfire detection assembly, used in conjunction with a motor vehicle having a fuel injector, an internal combustion engine and at least one output sensor, includes: a correlator which is electrically connected to the fuel injector and the output sensor wherein the correlator correlates firing events created by the fuel injector with an output signal created by the output sensor; a filter electrically connected to the correlator to receive the output signal and to compare the output signal against a variable threshold signal created by the filter; and a recorder, electrically connected to the filter, to record the firing events which exceed the variable threshold signal and those which do not exceed the variable threshold signal.
Inventors
- 👤 Richard J. Hampo
- 👤 Kenneth A. Marko
- 👤 Bruce D. Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:15
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
A method for creating an optimal filter to separate data collected from an internal combustion engine from a plurality of usable filters, the method comprising the steps of: collecting data from the internal combustion engine; operating each of the plurality of usable filters with the data collected to separate the data into a proper firing category and a misfire category; separating the data into a false positive category and a false negative category; modifying a portion of the plurality of usable filters to create a new population of usable filters; testing each of the new population of usable filters to identify the optimal filter to be used on-board a motor vehicle to accurately detect misfire events created by the internal combustion engine; weighting the data in the false positive category greater than the data in the false negative category; and measuring the accuracy of each of the new population of usable filters based on the weighted false positive category and the weighted false negative category.
Claim 2
Independent Claim
165 words
A method for creating an optimal filter to separate data collected from an internal combustion engine from a plurality of usable filters, the method comprising the steps of: collecting data from the internal combustion engine; operating each of the plurality of usable filters with the data collected to separate the data into a proper firing category and a misfire category; separating the data into a false positive category and a false negative category; modifying a portion of the plurality of usable filters to create a new population of usable filters; testing each of the new population of usable filters to identify the optimal filter to be used on-board a motor vehicle to accurately detect misfire events created by the internal combustion engine; weighting the data in the false positive category greater than the data in the false negative category; and measuring the accuracy of each of the new population of usable filters based on the weighted false positive category and the weighted false negative category.
Claim 3
Dependent Claim
35 words
A method as set forth in claim 1 wherein the step of testing each of the new population of usable filters includes the step of measuring a firing mean value and a misfiring mean value.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 2 wherein the step of testing further includes measuring the fitness of each of the new population of usable filters.
Claim 5
Dependent Claim
20 words
A method as set forth in claim 3 wherein the step of modifying the population of usable filters is iterative.
Claim 6
Independent Claim
123 words
A method for creating an optimal filter to separate data collected from an internal combustion engine from a plurality of usable filters, the method comprising the steps of: collecting data from the internal combustion engine; operating each of the plurality of usable filters with the data collected to separate the data into a proper firing category and a misfire category; modifying a portion of the plurality of usable filters to create a new population of usable filters; and testing each of the new population of usable filters to identify the optimal filter to be used on-board a motor vehicle to accurately detect each of the events, the testing step including maximizing a difference between a firing mean value and a misfiring mean value.
Claim 7
Independent Claim
123 words
A method for creating an optimal filter to separate data collected from an internal combustion engine from a plurality of usable filters, the method comprising the steps of: collecting data from the internal combustion engine; operating each of the plurality of usable filters with the data collected to separate the data into a proper firing category and a misfire category; modifying a portion of the plurality of usable filters to create a new population of usable filters; and testing each of the new population of usable filters to identify the optimal filter to be used on-board a motor vehicle to accurately detect each of the events, the testing step including maximizing a difference between a firing mean value and a misfiring mean value.
Claim 8
Dependent Claim
31 words
A method as set forth in claim 5 including the step of separating the data in the misfire category into a false positive misfire category and a false negative misfire category.
Claim 9
Dependent Claim
31 words
A method as set forth in claim 6 including the step of weighting the data in the false positive misfire category greater than the data in the false negative misfire category.
References Cited (Backward Citations)
US5153834A
Cited
US5267164A
Cited
US5361213A
Cited
US5426587A
Cited
US5307671A
Cited
US5263365A
Cited
US5379634A
Cited
US5237862A
Cited
US5377536A
Cited
US5361628A
Cited
US5495415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-24 | 2000-06-24 | 2000-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-24 | 2004-06-24 | 2004-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-24 | 2008-06-24 | 2008-12-24 | $7700.00 | Window Closed / Lapsed |