US4501250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling an internal combustion engine
Assignee: Denso Corp
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Filing: 1983-03-14
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Granted: 1985-02-26
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Expires: 2003-03-14
Abstract
Abstract For controlling an internal combustion engine at least first and second control maps are provided in which first and second control variables are stored respectively, which are addressible in response to different combinations of output parameters of the engine. First and second weighting factors are derived for weighting first and second control variables which are derived respectively in response to a first and a second combination of engine output operating parameters. The weighted first and second control variables are summed to derive a combined control variable for controlling one of the input operating parameters.
Inventors
- 👤 Norio Omori
- 👤 Tsutomu Tabe
- 👤 Katsunori Ito
- 👤 Shuukichi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:44
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/2406; F02D41/2409; F02D41/2412; F02D41/2422
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
176 words
An apparatus for controlling an internal combustion engine having a plurality of input operating parameters, comprising: a plurality of sensors for detecting first, second and third output operating parameters of said engine; and a microcomputer having at least first and second control maps in which first and second control variables are arranged respectively, said first and second control variables being addressible in response to different combinations of said detected output operating parameters, said microcomputer being programmed to execute the following steps: (a) deriving first and second weighting factors; (b) addressing said first control map to derive a said first control variable in response to the detected first and second output operating parameters; (c) addressing said second control map to derive a said second control variable in response to the detected second and third output operating parameters; (d) multiplying said first and second control variables by said first and second weighting factors, respectively; and (e) summing said multiplied first and second control variables to derive a combined control variable for controlling one of said input operating parameters.
Claim 2
Independent Claim
176 words
An apparatus for controlling an internal combustion engine having a plurality of input operating parameters, comprising: a plurality of sensors for detecting first, second and third output operating parameters of said engine; and a microcomputer having at least first and second control maps in which first and second control variables are arranged respectively, said first and second control variables being addressible in response to different combinations of said detected output operating parameters, said microcomputer being programmed to execute the following steps: (a) deriving first and second weighting factors; (b) addressing said first control map to derive a said first control variable in response to the detected first and second output operating parameters; (c) addressing said second control map to derive a said second control variable in response to the detected second and third output operating parameters; (d) multiplying said first and second control variables by said first and second weighting factors, respectively; and (e) summing said multiplied first and second control variables to derive a combined control variable for controlling one of said input operating parameters.
Claim 3
Dependent Claim
76 words
An apparatus as claimed in claim 1, wherein said first, second and third output operating parameters are the intake manifold pressure, the speed of revolution and the throttle opening of said engine, respectively, and wherein one of said output operating parameters is used in at least one of the steps (b) and (c) to determine either of said manifold pressure and throttle opening as a predominant determining factor for addressing said first and second control variables.
Claim 4
Dependent Claim
26 words
An apparatus as claimed in claim 1, wherein one of said weighting factors is variable as a function of one of said detected output operating parameters.
Claim 5
Dependent Claim
52 words
An apparatus as claimed in claim 1, wherein the step (a) comprises the steps of detecting when said first output operating parameter is abnormal, setting said first weighting factor to zero, and detecting when said second output operating parameter is abnormal and setting said second weighting factor to a predetermined constant value.
Claim 6
Dependent Claim
45 words
An apparatus as claimed in claim 1, wherein said one weighting factor is derived from a map addressible in response to said one detected operating parameter, there being a transfer function describing the relationship between said one weighting factor and said one detected operating parameter.
Claim 7
Dependent Claim
15 words
An apparatus as claimed in claim 5, wherein said transfer function has a hysteresis characteristic.
Claim 8
Dependent Claim
42 words
An apparatus as claimed in claim 6, wherein said transfer function of hysteresis characteristic comprises a first slope section and a second slope section, said one weighting factor being variable following each of said first and second slope sections in opposite directions.
Claim 9
Dependent Claim
45 words
An apparatus as claimed in claim 7, wherein said one weighting factor is derived from a map addressible in response to said one detected operating parameter, there being a transfer function describing the relationship between said one weighting factor and said one detected operating parameter.
Claim 10
Independent Claim
169 words
A method for controlling an internal combustion engine having a plurality of input operating parameters and a plurality of output operating parameters, comprising the steps of: (a) providing at least first and second control maps in which first and second control variables are arranged respectively, said first and second control variables being addressible in response to different combinations of said output parameters; (b) detecting first, second and third output operating parameters of said engine; (c) deriving first and second weighting factors; (d) addressing said first control map to derive a said first control variable in response to the detected first and second output operating parameters; (e) addressing said second control map to derive a said second control variable in response to the detected second and third output operating parameters; (f) multiplying said first and second control variables by said first and second weighting factors, respectively; and (g) summing said multiplied first and second control variables to derive a combined control variable for controlling one of said input operating parameters.
Claim 11
Independent Claim
169 words
A method for controlling an internal combustion engine having a plurality of input operating parameters and a plurality of output operating parameters, comprising the steps of: (a) providing at least first and second control maps in which first and second control variables are arranged respectively, said first and second control variables being addressible in response to different combinations of said output parameters; (b) detecting first, second and third output operating parameters of said engine; (c) deriving first and second weighting factors; (d) addressing said first control map to derive a said first control variable in response to the detected first and second output operating parameters; (e) addressing said second control map to derive a said second control variable in response to the detected second and third output operating parameters; (f) multiplying said first and second control variables by said first and second weighting factors, respectively; and (g) summing said multiplied first and second control variables to derive a combined control variable for controlling one of said input operating parameters.
Claim 12
Dependent Claim
19 words
A method as claimed in claim 9, wherein said first and second weighting factors are complementary to each other.
Claim 13
Dependent Claim
76 words
A method as claimed in claim 9, wherein said first, second and third output operating parameters are the intake manifold pressure, the speed of revolution and the throttle opening of said engine, respectively, and wherein one of said output operating parameters is used in at least one of the steps (d) and (e) to determine either of said manifold pressure and throttle opening as a predominant determining factor for addressing said first and second control variables.
Claim 14
Dependent Claim
51 words
A method as claimed in claim 9, wherein the step (c) comprises the steps of detecting when said first output operating parameter is abnormal, setting said first weighting factor to zero, detecting when said second output operating parameter is abnormal and setting said second weighting factor to a predetermined constant value.
Claim 15
Dependent Claim
26 words
A method as claimed in claim 9, wherein one of said weighting factors is variable as a function of one of said detected output operating parameters.
Claim 16
Dependent Claim
45 words
A method as claimed in claim 13, wherein said one weighting factor is derived from a map addressible in response to said one detected operating parameter, there being a transfer function describing the relationship between said one weighting factor and said one detected operating parameter.
Claim 17
Dependent Claim
45 words
A method as claimed in claim 9, wherein said one weighting factor is derived from a map addressible in response to said one detected operating parameter, there being a transfer function describing the relationship between said one weighting factor and said one detected operating parameter.
Claim 18
Dependent Claim
15 words
A method as claimed in claim 15, wherein said transfer function has a hysteresis characteristic.
Claim 19
Dependent Claim
42 words
A method as claimed in claim 16, wherein said transfer function of hysteresis characteristic comprises a first slope section and a second slope section, said one weighting factor being variable following each of said first and second slope sections in opposite directions.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |