Patent US4503829A successfully refreshed from Google Patents.
US4503829A
Expired / Lapsed
US
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Fuel supply control method for internal combustion engines under high load conditions
Assignee: Honda Motor Co Ltd
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Filing: 1983-11-16
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Granted: 1985-03-12
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Expires: 2003-11-16
Abstract
Abstract A fuel supply control method for an internal combustion engine, in which while the rotational speed of the engine is lower than a predetermined value, the mixture is enriched either when a detected value of absolute pressure in the intake pipe of the engine is higher than a first predetermined value or when a detected value of the throttle valve opening is larger than a predetermined value, whereas while the rotational speed of the engine is higher than the predetermined value, the mixture is enriched when a detected value of the intake pipe absolute pressure is higher than a second predetermined value, thereby preventing an excessive increase in the bed temperature of the catalyst device of the engine, as well as ensuring required output performance of the engine.
Inventors
- 👤 Shumpei Hasegawa
- 👤 Yutaka Otobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
342 words
A method of electronically controlling the quantity of fuel being supplied to an internal combustion engine having an intake passage, and a throttle valve arranged in said intake passage, in response to operating conditions of said engine, so as to achieve desired air-fuel ratios of a mixture being supplied to said engine, the method comprising the steps of: (a) detecting the rotational speed of said engine; (b) detecting absolute pressure in said intake passage of said engine at a zone downstream of said throttle valve therein; (c) detecting the valve opening of said throttle valve; (d) comparing a detected value of the rotational speed of said engine with a predetermined value; (e) comparing a detected value of said intake passage absolute pressure with a first predetermined valve and also comparing a detected value of said throttle valve opening with a predetermined value, when the detected value of the rotational speed of said engine is lower than said predetermined value thereof; (f) determining that said engine is operating in a first predetermined mixture-enriching region, when at least one of the detected values of said intake passage absolute pressure and said throttle valve opening is higher or larger than a corresponding one of said first predetermined value and said predetermined value thereof as results of the comparisons of the step (e); (g) comparing the detected value of said intake passage absolute pressure with a second predetermined value, when the detected value of the rotational speed of said engine is higher than said predetermined value thereof; (h) determining that said engine is operating in a second predetermined mixture-enriching region, when the determined value of said intake passage absolute pressure is higher than said second predetermined value thereof as a result of the comparison of the step (g); and (i) controlling the air-fuel ratio of said mixture to a predetermined value smaller than a stoichiometic mixture ratio, when it is determined in the step (f) or the step (h) that said engine is operating in a corresponding one of said first and second predetermined mixture-enriching regions.
Claim 2
Independent Claim
342 words
A method of electronically controlling the quantity of fuel being supplied to an internal combustion engine having an intake passage, and a throttle valve arranged in said intake passage, in response to operating conditions of said engine, so as to achieve desired air-fuel ratios of a mixture being supplied to said engine, the method comprising the steps of: (a) detecting the rotational speed of said engine; (b) detecting absolute pressure in said intake passage of said engine at a zone downstream of said throttle valve therein; (c) detecting the valve opening of said throttle valve; (d) comparing a detected value of the rotational speed of said engine with a predetermined value; (e) comparing a detected value of said intake passage absolute pressure with a first predetermined valve and also comparing a detected value of said throttle valve opening with a predetermined value, when the detected value of the rotational speed of said engine is lower than said predetermined value thereof; (f) determining that said engine is operating in a first predetermined mixture-enriching region, when at least one of the detected values of said intake passage absolute pressure and said throttle valve opening is higher or larger than a corresponding one of said first predetermined value and said predetermined value thereof as results of the comparisons of the step (e); (g) comparing the detected value of said intake passage absolute pressure with a second predetermined value, when the detected value of the rotational speed of said engine is higher than said predetermined value thereof; (h) determining that said engine is operating in a second predetermined mixture-enriching region, when the determined value of said intake passage absolute pressure is higher than said second predetermined value thereof as a result of the comparison of the step (g); and (i) controlling the air-fuel ratio of said mixture to a predetermined value smaller than a stoichiometic mixture ratio, when it is determined in the step (f) or the step (h) that said engine is operating in a corresponding one of said first and second predetermined mixture-enriching regions.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1, wherein said first and second predetermined values of said intake passage absolute pressure are set at values different from each other.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 2, wherein said second predetermined value of said intake passage absolute pressure is set at a value lower than said first predetermined value thereof.
Claim 5
Dependent Claim
46 words
A method as claimed in claim 1, wherein when said engine is operating in said first predetermined mixture-enriching region, said predetermined value of the air-fuel ratio of said mixture is set to smaller values as the detected value of said throttle valve opening assumes larger values.
Claim 6
Dependent Claim
53 words
A method as claimed in claim 1, wherein when said engine is operating in at least one of said first and second predetermined mixture-enriching regions, said predetermined value of the air-fuel ratio of said mixture is set to smaller values as the detected value of said intake passage absolute presssure assumes larger values.
Claim 7
Independent Claim
363 words
A method of electronically controlling the quantity of fuel being supplied to an internal combustion engine having an intake passage, and a throttle valve arranged in said intake passage, in response to operating conditions of said engine, so as to achieve desired air-fuel ratios of a mixture being supplied to said engine, the method comprising the steps of: (a) detecting the rotational speed of said engine; (b) detecting absolute pressure in said intake passage of said engine at a zone downstream of said throttle valve therein; (c) detecting the valve opening of said throttle valve; (d) comparing a detected value of the rotational speed of said engine with a predetermined value; (e) comparing a detected value of said intake passage absolute pressure with a first predetermined value, when the detected value of the rotational speed of said engine is lower than said predetermined value thereof; (f) determining that said engine is operating in a first predetermined mixture-enriching region, when the detected value of said intake passage absolute pressure is higher than said first predetermined value thereof as a result of the comparison of the step (e); (g) comparing the detected value of said throttle valve opening with a predetermined value, when the detected valve of said intake passage absolute pressure is lower than said first predetermined value thereof; (h) determining that said engine is operating in a second predetermined mixture-enriching region, when the detected value of said throttle valve opening is larger than said predetermined value thereof as a result of the comparison of the step (g); (i) comparing the detected value of said intake passage absolute pressure with a second predetermined value, when the detected value of predetermined value thereof; (j) determining that said engine is operating in a third predetermined mixture-enriching region, when the detected value of said intake passage absolute pressure is higher than said second predetermined value thereof; (k) controlling the air-fuel ratio of said mixture to a predetermined value smaller than a stoichiometic mixture ratio, when it is determined in the step (f), the step (h), or the step (j) that said engine is operating in a corresponding one of said first, second and third predetermined mixture-enriching regions.
Claim 8
Independent Claim
363 words
A method of electronically controlling the quantity of fuel being supplied to an internal combustion engine having an intake passage, and a throttle valve arranged in said intake passage, in response to operating conditions of said engine, so as to achieve desired air-fuel ratios of a mixture being supplied to said engine, the method comprising the steps of: (a) detecting the rotational speed of said engine; (b) detecting absolute pressure in said intake passage of said engine at a zone downstream of said throttle valve therein; (c) detecting the valve opening of said throttle valve; (d) comparing a detected value of the rotational speed of said engine with a predetermined value; (e) comparing a detected value of said intake passage absolute pressure with a first predetermined value, when the detected value of the rotational speed of said engine is lower than said predetermined value thereof; (f) determining that said engine is operating in a first predetermined mixture-enriching region, when the detected value of said intake passage absolute pressure is higher than said first predetermined value thereof as a result of the comparison of the step (e); (g) comparing the detected value of said throttle valve opening with a predetermined value, when the detected valve of said intake passage absolute pressure is lower than said first predetermined value thereof; (h) determining that said engine is operating in a second predetermined mixture-enriching region, when the detected value of said throttle valve opening is larger than said predetermined value thereof as a result of the comparison of the step (g); (i) comparing the detected value of said intake passage absolute pressure with a second predetermined value, when the detected value of predetermined value thereof; (j) determining that said engine is operating in a third predetermined mixture-enriching region, when the detected value of said intake passage absolute pressure is higher than said second predetermined value thereof; (k) controlling the air-fuel ratio of said mixture to a predetermined value smaller than a stoichiometic mixture ratio, when it is determined in the step (f), the step (h), or the step (j) that said engine is operating in a corresponding one of said first, second and third predetermined mixture-enriching regions.
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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |