US4713766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling air-fuel ratio in internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1985-05-06
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Granted: 1987-12-15
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Expires: 2005-05-06
Abstract
Abstract In an internal combustion engine having a throttle valve, a flag or switch having hysteresis characteristics using the operation of the throttle valve is provided.
Inventors
- 👤 Nobuyuki Kobayashi
- 👤 Takashi Hattori
- 👤 Katsunori Yagi
- 👤 Toshimitsu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:45
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/045; F02D41/0002; F02D41/24; F02D41/26; F02D41/263; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
A method for controlling the air-fuel ratio in an internal combustion engine having a throttle valve therein comprising the steps of: determining whether or not the opening of said throttle valve reaches a definite value; fetching a parameter of said engine as a first value showing the load thereof, when the opening of said throttle valve reaches said definite value; calculating a second value of said parameter of said engine, smaller than said first value; determining whether or not said parameter of said engine reaches said second value; calculating whether a first state is set by the opening of the throttle valve reaching said definite value and whether a second state is set by said parameter of said engine reaching said second value; calculating an air-fuel ratio in response to said first and second states; and controlling the air-fuel ratio of said engine so that it is brought close to said calculated air-fuel ratio.
Claim 2
Independent Claim
154 words
A method for controlling the air-fuel ratio in an internal combustion engine having a throttle valve therein comprising the steps of: determining whether or not the opening of said throttle valve reaches a definite value; fetching a parameter of said engine as a first value showing the load thereof, when the opening of said throttle valve reaches said definite value; calculating a second value of said parameter of said engine, smaller than said first value; determining whether or not said parameter of said engine reaches said second value; calculating whether a first state is set by the opening of the throttle valve reaching said definite value and whether a second state is set by said parameter of said engine reaching said second value; calculating an air-fuel ratio in response to said first and second states; and controlling the air-fuel ratio of said engine so that it is brought close to said calculated air-fuel ratio.
Claim 3
Dependent Claim
32 words
A method as set forth in claim 1, further comprising the steps of: calculating an ignition timing in response to said flag; and performing ignition upon said engine at said ignition timing.
Claim 4
Dependent Claim
24 words
A method as set forth in claim 1, further comprising a step of generating a swirl in said engine in response to said flag.
Claim 5
Dependent Claim
19 words
A method as set forth in claim 1, wherein said parameter is the intake air pressure of said engine.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 1, wherein said parameter is the intake air amount of said engine.
Claim 7
Dependent Claim
17 words
A method as set forth in claim 1, wherein said parameter is the speed of said engine.
Claim 8
Independent Claim
188 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine having a throttle valve therein, comprising: means for determining whether or not the opening of said throttle valve is smaller than a definite value; first switch means which is in an on-state only when the opening of said throttle valve is equal to or larger than said definite value; second switch means which is turned on by the turning-on of said first switch means; means for fetching a parameter of said engine as a first value showing the load thereof when said first switch means is turned on; means for calculating a second value of said parameter of said engine smaller than said first value; means for determining whether or not said parameter of said engine is smaller than said second value; means for turning off said second switch means, when the opening of said throttle valve is smaller than said second value; calculating a target air-fuel ratio in response to said second switch means; and means for controlling the air-fuel ratio of said engine so that it is brought close to said target air-fuel ratio.
Claim 9
Independent Claim
188 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine having a throttle valve therein, comprising: means for determining whether or not the opening of said throttle valve is smaller than a definite value; first switch means which is in an on-state only when the opening of said throttle valve is equal to or larger than said definite value; second switch means which is turned on by the turning-on of said first switch means; means for fetching a parameter of said engine as a first value showing the load thereof when said first switch means is turned on; means for calculating a second value of said parameter of said engine smaller than said first value; means for determining whether or not said parameter of said engine is smaller than said second value; means for turning off said second switch means, when the opening of said throttle valve is smaller than said second value; calculating a target air-fuel ratio in response to said second switch means; and means for controlling the air-fuel ratio of said engine so that it is brought close to said target air-fuel ratio.
Claim 10
Dependent Claim
33 words
An apparatus as set forth in claim 7, further comprising: means for calculating an ignition timing in response to said second switch means, and performing ignition upon said engine at said ignition timing.
Claim 11
Dependent Claim
36 words
An apparatus as set forth in claim 7, further comprising: swirl control valve means for generating swirl in said engine; and means for controlling said swirl control valve means in response to said second switch means
Claim 12
Dependent Claim
19 words
An apparatus as set forth in claim 7, wherein said parameter is the intake air pressure of said engine.
Claim 13
Dependent Claim
19 words
An apparatus as set forth in claim 7, wherein said parameter is the intake air amount of said engine
Claim 14
Dependent Claim
17 words
An apparatus as set forth in claim 7, wherein said parameter is the speed of said engine.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |