US5297064A
Expired / Lapsed
US
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Sensor lag compensation
Assignee: GM Global Technology Operations LLC
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Filing: 1991-04-01
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Granted: 1994-03-22
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Expires: 2011-04-01
Abstract
Abstract An algorithm, for use in automotive vehicle control systems for substantially reducing control inaccuracies caused by parameter sensing delays, predicts the present value of a sensed parameter by establishing a time history of the parameter behavior over a predetermined time period, and by extending the time history to the present time based on the dominant time constant of the parameter, the most recent sensed value of the parameter, and a calculated rate of change in the time history of the parameter.
Inventors
- 👤 Paul A. Bauerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:45
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; F02D41/02; F02D41/04; F02D41/045; F02D41/30; F02D41/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A method for approximation of a present value of a measured automotive control parameter, variations in the value of said parameter being substantially describable by means of a dominant time constant, comprising the steps of: sensing the value of the parameter; estimating the rate of variation of the parameter; approximating the dominant time constant of the parameter; and determining the present value of said parameter, based on the sensed value, the rate of variation of the sensed value, and the dominant time constant of the parameter.
Claim 2
Independent Claim
86 words
A method for approximation of a present value of a measured automotive control parameter, variations in the value of said parameter being substantially describable by means of a dominant time constant, comprising the steps of: sensing the value of the parameter; estimating the rate of variation of the parameter; approximating the dominant time constant of the parameter; and determining the present value of said parameter, based on the sensed value, the rate of variation of the sensed value, and the dominant time constant of the parameter.
Claim 3
Dependent Claim
52 words
The method of claim 1, wherein said step of estimating the rate of variation of the parameter further comprises the steps of: storing a predetermined number of the most recent sensed values of the parameter; and estimating the rate of change of the first order relationship between said most recent sensed values.
Claim 4
Dependent Claim
45 words
The method of claim 1, wherein said step of approximating the dominant time constant further comprises the steps of: sensing predetermined factors that substantially affect the value of the time constant; and approximating the value of the time constant based on said sensed predetermined factors.
Claim 5
Independent Claim
99 words
An apparatus for approximation of a present value of a measured automotive control parameter, variations in the value of said parameter being substantially describable by means of a dominant time constant, comprising: sensing means for sensing the value of the parameter; rate of variation estimating means for estimating the rate of variation of the parameter; means for approximating the dominant time constant of the parameter; and present value determining means for determining the present value of said parameter, based on the sensed value, the rate of variation of the sensed value, and the dominant time constant of the parameter.
Claim 6
Independent Claim
99 words
An apparatus for approximation of a present value of a measured automotive control parameter, variations in the value of said parameter being substantially describable by means of a dominant time constant, comprising: sensing means for sensing the value of the parameter; rate of variation estimating means for estimating the rate of variation of the parameter; means for approximating the dominant time constant of the parameter; and present value determining means for determining the present value of said parameter, based on the sensed value, the rate of variation of the sensed value, and the dominant time constant of the parameter.
Claim 7
Dependent Claim
53 words
The apparatus of claim 4, wherein said rate of variation estimation means further comprises: storing means for storing a predetermined number of the most recent sensed values of the parameter; and rate of variation estimating means for estimating the rate of variation of the first order relationship between said most recent sensed values.
Claim 8
Dependent Claim
47 words
The apparatus of claim 4, wherein said means for approximating the dominant time constant further comprises: sensing means for sensing predetermined factors that substantially affect the value of the time constant; and means for approximating the value of the time constant based on said sensed predetermined factors.
Claim 9
Independent Claim
182 words
An apparatus for approximation of a present value of engine manifold absolute pressure comprising: sensing means for sensing the value of engine manifold absolute pressure; rate of variation estimating means for estimating the rate of variation of manifold absolute pressure, comprising (a) means for storing a predetermined number of the most recent sensed values of manifold absolute pressure, (b) means for estimating the first order relationship between said stored values, and (c) means for determining the rate of change in the value of said first order relationship; means for approximating the present value of the dominant time constant of the manifold absolute pressure, comprising (a) means for sensing engine throttle position, and (b) means for approximating the present value of the dominant time constant based on said sensed engine throttle position; and present value determining means for determining the present value of engine manifold absolute pressure by summing the sensed value of engine manifold absolute pressure and a value based on the rate of change in the value of said first order relationship and the present value of the dominant time constant.
Claim 10
Independent Claim
182 words
An apparatus for approximation of a present value of engine manifold absolute pressure comprising: sensing means for sensing the value of engine manifold absolute pressure; rate of variation estimating means for estimating the rate of variation of manifold absolute pressure, comprising (a) means for storing a predetermined number of the most recent sensed values of manifold absolute pressure, (b) means for estimating the first order relationship between said stored values, and (c) means for determining the rate of change in the value of said first order relationship; means for approximating the present value of the dominant time constant of the manifold absolute pressure, comprising (a) means for sensing engine throttle position, and (b) means for approximating the present value of the dominant time constant based on said sensed engine throttle position; and present value determining means for determining the present value of engine manifold absolute pressure by summing the sensed value of engine manifold absolute pressure and a value based on the rate of change in the value of said first order relationship and the present value of the dominant time constant.
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| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
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