EP0163952A2
Expired / Lapsed
EP
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A control device of an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1985-05-03
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Granted: —
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Expires: 2005-05-03
Abstract
Abstract An engine having a fuel injector for normally feeding a lean air-fuel mixture into the engine cylinders. Ignition timing is determined so that it is suitable for the lean air-fuel mixture. The gear changing operation of the transmission of the engine is detected from the change in the engine speed and the change in the absolute pressure in the intake passage. When the gear changing operation is carried out, a rich air-fuel mixture is fed into the engine cylinders, and the ignition timing is retarded.
Inventors
- 👤 Kazuhiko Norota
- 👤 Takashi Hattori
- 👤 Nobuyuki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:17
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/04; B60W10/10; B60W10/11; B60W30/1819; F; F02; F02D; F02D35/00; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F16; F16H; F16H63/00; F16H63/40; F16H63/50; F16H63/502; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
176 words
A control device of an internal combustion engine having a transmission, an intake passage and a spark plug arranged in a combustion chamber; said device comprising: fuel supply means arranged in said intake passage for feeding fuel into said intake passage; discriminating means for discriminating whether the gear changing operation of said transmission is carried out and producing an output signal indicating that the gear changing operation is carried out; fuel supply control means connected to said fuel supply means and controlled in response to the output signal of said discriminating means for normally forming a lean air-fuel mixture in said intake passage and for temporarily forming a rich air-fuel mixture in said intake passage when the gear changing operation is carried out; and, ignition timing control means connected to said spark plug and controlled in response to the output signal of said discriminating means for normally causing ignition at a predetermined basic ignition timing and for temporarily retarding the ignition timing relative to said basic ignition timing when the gear changing operation is carried out.
Claim 2
Dependent Claim
176 words
A control device of an internal combustion engine having a transmission, an intake passage and a spark plug arranged in a combustion chamber; said device comprising: fuel supply means arranged in said intake passage for feeding fuel into said intake passage; discriminating means for discriminating whether the gear changing operation of said transmission is carried out and producing an output signal indicating that the gear changing operation is carried out; fuel supply control means connected to said fuel supply means and controlled in response to the output signal of said discriminating means for normally forming a lean air-fuel mixture in said intake passage and for temporarily forming a rich air-fuel mixture in said intake passage when the gear changing operation is carried out; and, ignition timing control means connected to said spark plug and controlled in response to the output signal of said discriminating means for normally causing ignition at a predetermined basic ignition timing and for temporarily retarding the ignition timing relative to said basic ignition timing when the gear changing operation is carried out.
Claim 3
Dependent Claim
61 words
A control device according to claim 1, wherein said discriminating means continues to produce said output signal during a predetermined time period when the gear changing operation is carried out, the rich air-fuel mixture being formed in said intake passage during the time said output signal is produced, the ignition timing being retarded during the time said output signal is produced.
Claim 4
Dependent Claim
73 words
A control device according to claim 2, further comprising an engine speed sensor which produces an output signal representing the engine speed, and a vacuum sensor arranged in said intake passage and producing an output signal which represents the absolute pressure in said intake passage, said discriminating means discriminating whether the gear changing operation is carried out on the basis of the output signals of said engine speed sensor and said vacuum sensor.
Claim 5
Dependent Claim
156 words
A control device according to claim 3, wherein said discriminating means comprises first means calculating the degree of change in said absolute pressure, second means judging whether said degree of change exceeds a predetermined upper level after said degree of change decreases below a predetermined lower level, third means calculating an elapsed time after said degree of change decreases below the predetermined lower level, fourth means judging whether said elapsed time is shorter than a predetermined time, and fifth means judging whether the engine speed decreases by a predetermined speed within said predetermined time, the output signal of said discriminating means being produced when said degree of change exceeds the predetermined upper level after said degree of change decreases below the predetermined lower level and when the engine speed decreases by the predetermined speed within said predetermined time, the production of the output signal of said discriminating means being stopped after said predetermined time has elapsed.
Claim 6
Dependent Claim
69 words
A control device according to claim 1, further comprising an engine speed sensor which produces an output signal representing the engine speed, and a vacuum sensor arranged in said intake passage and producing an output signal which represents the absolute pressure in said intake passage, an air-fuel ratio of said rich air-fuel mixture being determined based on the output signals of said engine speed sensor and said vacuum sensor.
Claim 7
Dependent Claim
56 words
A control device according to claim 5, further comprising a lean sensor arranged in an exhaust passage of said engine and detecting an air-fuel ratio, an air-fuel ratio of the lean air-fuel mixture being controlled in response to an output signal of said lean sensor so that it becomes equal to a desired lean air-fuel ratio.
Claim 8
Dependent Claim
105 words
A control device according to claim 1, further comprising a throttle valve arranged in said intake passage, and a throttle switch connected to said throttle valve and producing an output signal which indicates whether the degree of opening of said throttle valve is larger than a predetermined degree, said fuel supply control means being controlled in response to the output signal of said throttle switch and forming a relatively lean air-fuel mixture or an extremely lean air-fuel mixture which is leaner than said relatively lean air-fuel mixture when the degree of opening of said throttle valve is larger or smaller than said predetermined degree, respectively.
Claim 9
Dependent Claim
81 words
A control device according to claim 1, further comprising an engine speed sensor which produces an output signal representing the engine speed, and a vacuum sensor arranged in said intake passage and producing an output signal which represents the absolute pressure in said intake passage, said ignition timing control means retarding the ignition timing by a predetermined crank angle relative to said basic ignition timing which is determined by the output signals of said vehicle speed sensor and said vacuum sensor.
Claim 10
Dependent Claim
42 words
A control device according to claim 8, wherein said predetermined crank angle is determined based on a lean correction coefficient representing a desired lean air-fuel ratio and determined based on the output signals of said engine speed sensor and said vacuum sensor.
Claim 11
Dependent Claim
64 words
A control device according to claim 1, wherein said intake passage has a helically-shaped intake port comprising a helical portion, a substantially straight extending inlet passage portion tangentially connected to said helical portion, a bypass passage branches off from said inlet passage portion and connected to a helix terminating portion of said helical portion, and a swirl control valve arranged in said bypass passage.
Claim 12
Dependent Claim
49 words
A control device according to claim 10, wherein said intake port has a separating wall projecting downward from an upper wall of said intake port and extending along an axis of said intake port, said separating wall defining said helical portion, said inlet passage portion, and said bypass passage.
References Cited (Backward Citations)
No citation records indexed.
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