US5508927A
Expired / Lapsed
US
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Apparatus and method for variable windowed peak detection in a misfire detection system
Assignee: Aumovio Systems Inc
•
Filing: 1994-07-25
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Granted: 1996-04-16
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Expires: 2014-07-25
Abstract
Abstract An apparatus, and a corresponding method, for determining misfire in a reciprocating engine operates on a selectable quantity of discrete sampled acceleration signals that are indicative of acceleration behavior of the reciprocating engine. A decimation device selects a quantity of the discrete sampled acceleration signals dependent on an engine family, and optionally engine operating conditions such as speed and load. An accelearation signal is selected from the sampled acceleration signals, preferably the sample having the most negative magnitude. A misfire determination device provides a misfire indication dependent on the selected acceleration signal.
Inventors
- 👤 Donald J. Remboski, Jr.
- 👤 Steven L. Plee
- 👤 Marvin L. Lynch
- 👤 Michael A. McClish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:28
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/11
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
114 words
An apparatus for determining misfire in a reciprocating engine, the apparatus comprising: acceleration measurement means for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; decimation means for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals, provided by the acceleration measurement means, between two angular positions of a rotary member of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and misfire determination means for providing a misfire indication dependent on the selected acceleration signal.
Claim 2
Independent Claim
114 words
An apparatus for determining misfire in a reciprocating engine, the apparatus comprising: acceleration measurement means for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; decimation means for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals, provided by the acceleration measurement means, between two angular positions of a rotary member of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and misfire determination means for providing a misfire indication dependent on the selected acceleration signal.
Claim 3
Dependent Claim
35 words
An apparatus in accordance with claim 1 wherein the selected acceleration signal has a magnitude most negative of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window.
Claim 4
Dependent Claim
86 words
An apparatus in accordance with claim 1 further comprising: positioning means for determining an angular position of a cylinder of the reciprocating engine; and wherein the decimation means responsive to the positioning means, acquires the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window, wherein the sampling window is configured to acquire the discrete sampled acceleration signals, corresponding to the acceleration behavior of the reciprocating engine, associated with the angular position of the cylinder determined by the positioning means.
Claim 5
Dependent Claim
41 words
An apparatus in accordance with claim 3 wherein an equal amount of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window, is acquired at angular positions surrounding the determined position of the cylinder.
Claim 6
Dependent Claim
45 words
An apparatus in accordance with claim 1 further comprising: means for measuring an engine operating condition; and wherein a quantity of the selectable quantity of samples of the discrete sampled acceleration signals bounded within the sampling window is dependent on the determined engine operating condition.
Claim 7
Dependent Claim
22 words
An apparatus in accordance with claim 5 wherein the means for measuring an engine operating condition comprises means for measuring engine speed.
Claim 8
Dependent Claim
22 words
An apparatus in accordance with claim 5 wherein the means for measuring an engine operating condition comprises means for measuring engine load.
Claim 9
Dependent Claim
58 words
An apparatus in accordance with claim 1 further comprising: means for measuring an engine operating condition; and wherein the two angular positions of the rotary member of the reciprocating engine, corresponding to the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within a sampling window, are selectable dependent on the determined engine operating condition.
Claim 10
Dependent Claim
22 words
An apparatus in accordance with claim 8 wherein the means for measuring an engine operating condition comprises means for measuring engine speed.
Claim 11
Dependent Claim
22 words
An apparatus in accordance with claim 8 wherein the means for measuring an engine operating condition comprises means for measuring engine load.
Claim 12
Independent Claim
125 words
An apparatus for variable windowed peak detection in a misfire detection system for a reciprocating engine, the apparatus comprising: acceleration measurement means for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; positioning means for determining an angular position of the reciprocating engine; decimation means for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals corresponding to the determined angular position of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and misfire determination means for providing a misfire indication dependent on the provided selected acceleration signal.
Claim 13
Independent Claim
125 words
An apparatus for variable windowed peak detection in a misfire detection system for a reciprocating engine, the apparatus comprising: acceleration measurement means for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; positioning means for determining an angular position of the reciprocating engine; decimation means for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals corresponding to the determined angular position of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and misfire determination means for providing a misfire indication dependent on the provided selected acceleration signal.
Claim 14
Dependent Claim
34 words
An apparatus in accordance with claim 11 further comprising: means for measuring an engine operating condition; and wherein the angular position of the reciprocating engine is selectable dependent on the determined engine operating condition.
Claim 15
Dependent Claim
22 words
An apparatus in accordance with claim 12 wherein the means for measuring an engine operating condition comprises means for measuring engine speed.
Claim 16
Dependent Claim
35 words
An apparatus in accordance with claim 13 wherein the selected acceleration signal has a magnitude most negative of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window.
Claim 17
Dependent Claim
22 words
An apparatus in accordance with claim 12 wherein the means for measuring an engine operating condition comprises means for measuring engine load.
Claim 18
Dependent Claim
150 words
A reciprocating engine misfire detection system having variable windowed peak detect, the system comprising: an acceleration sensory system coupled to the reciprocating engine for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; a positioning device for determining an angular position of the reciprocating engine; a decimation device for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals the selectable quantity corresponding to a subset of the continuous stream of discrete sampled acceleration signals associated with the determined angular position of the reciprocating engine, and for selecting an acceleration signal having a magnitude most negative from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and a misfire determination device for providing a misfire indication dependent on the provided selected acceleration signal.
Claim 19
Dependent Claim
150 words
A reciprocating engine misfire detection system having variable windowed peak detect, the system comprising: an acceleration sensory system coupled to the reciprocating engine for providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; a positioning device for determining an angular position of the reciprocating engine; a decimation device for operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals the selectable quantity corresponding to a subset of the continuous stream of discrete sampled acceleration signals associated with the determined angular position of the reciprocating engine, and for selecting an acceleration signal having a magnitude most negative from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and a misfire determination device for providing a misfire indication dependent on the provided selected acceleration signal.
Claim 20
Dependent Claim
31 words
An apparatus in accordance with claim 16 further comprising: means for measuring engine speed; and wherein the angular position determined by the positioning device is dependent on the determined engine speed.
Claim 21
Independent Claim
106 words
A method for determining misfire in a reciprocating engine, the method comprising the steps of: providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals, provided by the step of providing, between two angular positions of a rotary member of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and providing a misfire indication dependent on the selected acceleration signal.
Claim 22
Independent Claim
106 words
A method for determining misfire in a reciprocating engine, the method comprising the steps of: providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals, provided by the step of providing, between two angular positions of a rotary member of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and providing a misfire indication dependent on the selected acceleration signal.
Claim 23
Dependent Claim
35 words
A method in accordance with claim 18 wherein the selected acceleration signal has a magnitude most negative of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window.
Claim 24
Dependent Claim
101 words
A method in accordance with claim 19 further comprising the step of: determining an angular position of a cylinder of the reciprocating engine; and wherein the step of operating, responsive to the step of determining an angular position of a cylinder, acquires the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window, wherein the sampling window is configured to acquire the discrete sampled acceleration signals, corresponding to the acceleration behavior of the reciprocating engine, associated with the angular position of the cylinder determined by the step of determining an angular position of a cylinder.
Claim 25
Dependent Claim
41 words
A method in accordance with claim 20 wherein an equal amount of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window, is acquired at angular positions surrounding the determined position of the cylinder.
Claim 26
Dependent Claim
46 words
A method in accordance with claim 18 further comprising the step of: measuring an engine operating condition; and wherein a quantity of the selectable quantity of samples of the discrete sampled acceleration signals bounded within the sampling window is dependent on the determined engine operating condition.
Claim 27
Dependent Claim
23 words
A method in accordance with claim 22 wherein the step of measuring an engine operating condition comprises a step of measuring engine speed.
Claim 28
Dependent Claim
22 words
A method in accordance with claim 22 wherein the step of measuring an engine operating condition comprises step of measuring engine load.
Claim 29
Independent Claim
114 words
A method for variable windowed peak detection in a misfire detection system for a reciprocating engine, the method comprising the steps of: providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; determining an angular position of the reciprocating engine; operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals corresponding to the determined angular position of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and providing a misfire indication dependent on the provided selected acceleration signal.
Claim 30
Independent Claim
114 words
A method for variable windowed peak detection in a misfire detection system for a reciprocating engine, the method comprising the steps of: providing a continuous stream of discrete sampled acceleration signals indicative of acceleration behavior of the reciprocating engine; determining an angular position of the reciprocating engine; operating within a sampling window configured to act on a selectable quantity of the continuous stream of discrete sampled acceleration signals corresponding to the determined angular position of the reciprocating engine, and for selecting an acceleration signal from the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window; and providing a misfire indication dependent on the provided selected acceleration signal.
Claim 31
Dependent Claim
35 words
A method in accordance with claim 25 further comprising the step of: measuring an engine operating condition; and wherein the angular position of the reciprocating engine is selectable dependent on the determined engine operating condition.
Claim 32
Dependent Claim
22 words
A method in accordance with claim 26 wherein the step of measuring an engine operating condition comprises step of measuring engine speed.
Claim 33
Dependent Claim
35 words
A method in accordance with claim 27 wherein the selected acceleration signal has a magnitude most negative of the selectable quantity of the continuous stream of discrete sampled acceleration signals bounded within the sampling window.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |