EP0724067A1
Expired / Lapsed
EP
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Control system for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1996-01-26
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Granted: —
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Expires: 2016-01-26
Abstract
Abstract A control system for an internal combustion engine having a plurality of cylinders each having at least one intake valve (2), at least one exhaust valve (2), and a crankshaft. The control system has an electromagnetic driving section (10) which electromagnetically causes opening and closing of at least one of the at least one intake valve (2) and the at least one exhaust valve (2). A crank angle sensor generates a crank angle signal whenever the crankshaft rotates through a predetermined angle, and a cylinder position sensor generates a cylinder-discriminating signal indicative of a predetermined crank angle of a particular cylinder of a plurality of the cylinders. A piston position sensor detects an operating state or position of the piston of each of the plurality of the cylinders, based on the generated crank angle signal and the generated cylinder-discriminating signal. A CPU (16) starts opening of the at least one of the at least one intake valve (2) and the at least one exhaust valve (2), based on the detected operating state of the piston.
Inventors
- 👤 Hiroshi Sono
- 👤 Ken Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:18
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/009; F01; F01L; F01L9/00; F01L9/20; F02D13/00; F02D13/02; F02D13/0203; F02D13/0215; F02D13/0253; F02D41/0002; F02D41/30; F02D41/32; F02D41/34; F02D41/345; F02D2041/001; F02N; F02N19/00; F02N19/004; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
In a control system for an internal combustion engine having a plurality of cylinders each having a piston, at least one intake valve, and at least one exhaust valve, and a crankshaft, said control system having electromagnetic driving means for electromagnetically causing opening and closing of at least one of said at least one intake valve and said at least one exhaust valve, the improvement comprising: the crank angle-detecting means for generating a crank angle signal whenever said crankshaft rotates through a predetermined angle; cylinder position-detecting means for generating a cylinder-discriminating signal indicative of a predetermined crank angle of a particular cylinder of said plurality of said cylinders; piston operating state-detecting means for detecting an operating state of said piston of each of said plurality of said cylinders, based on said crank angle signal generated by said crank angle-detecting means and said cylinder-discriminating signal generated by said cylinder position-detecting means; and valve operation control means for starting opening of said at least one of said at least one intake valve and said at least one exhaust valve, based on said operating state of said piston detected by said piston operating state-detecting means.
Claim 2
Dependent Claim
102 words
A control system as claimed in claim 1, wherein said piston operating state-detecting means comprises means for allotting predetermined injection stages corresponding to respective different operating strokes of said engine, respectively, to said plurality of said cylinders and for setting a crank pulse stage in predetermined relation to said predetermined injection stages, in response to generation of said crank angle signal immediately after first generation of said cylinder-discriminating signal at the start of said engine, and means for detecting a position of said piston of each of said plurality of said cylinders from said predetermined injection stages and said crank pulse stage.
Claim 3
Dependent Claim
242 words
In a control system for an internal combustion engine installed in a vehicle having an accelerator pedal, said engine having at least one intake valve and at least one exhaust valve, at least one of said at least one intake valve and said at least one exhaust valve having a valve-opening electromagnetic element and a valve-closing electromagnetic element, said control system having electromagnetic driving means for electromagnetically causing opening and closing of said at least one of said at least one intake valve and said at least one exhaust valve, the improvement comprising: accelerator pedal position-detecting means for detecting an operating amount of said accelerator pedal; operating condition-detecting means for detecting at least one operating parameter of said engine at least including rotational speed of said engine; and energization-stopping timing-determining means for determining energization-stopping timing of said valve-opening electromagnetic element and energization-stopping timing of said valve-closing electromagnetic element, based on said at least one operating amount of said accelerator pedal detected by said accelerator pedal position-detecting means and said at least one operating parameter of said engine detected by said operating condition-detecting means; wherein said electromagnetic driving means causes opening and closing of said at least one of said at least one intake valve and said at least one exhaust valve, based on said energization-stopping timing of said valve-opening electromagnetic element determined by said energization-stopping timing-determining means and said energization-stopping timing of said valve-closing electromagnetic element determined by said energization-stopping timing-determining means.
Claim 4
Dependent Claim
116 words
A control system as claimed in claim 3, further including energization-starting timing-determining means for determining energization-starting timing of said valve-opening electromagnetic element and energization-starting timing of said valve-closing electromagnetic element, based on said detected operating amount of said accelerator pedal, and said detected at least one operating parameter of said engine, said energization-starting timing-determining means setting said energization-starting timing of said valve-opening electromagnetic element to a time point which is earlier by a first time period than said energization-stopping timing of said valve-closing electromagnetic element and setting said energization-starting timing of said valve-closing electromagnetic element to a time point which is earlier by a second time period than said energization-starting timing of said valve-opening electromagnetic element.
Claim 5
Dependent Claim
85 words
A control system as claimed in claim 4, wherein said valve-opening electromagnetic element and said valve-closing electromagnetic element each have a coil, said control system including temperature-detecting means for detecting temperature of said coil of at least one of said valve-opening electromagnetic element and said valve-closing electromagnetic element, said first and second predetermined time periods being set depending on said temperature of said coil detected by said temperature-detecting means and said at least one operating parameter of said engine detected by said operating condition-detecting means.
Claim 6
Dependent Claim
114 words
A control system as claimed in claim 3, further including air-fuel ratio-detecting means for detecting an air-fuel ratio of an air-fuel mixture supplied to said engine, desired air-fuel ratio-calculating means for calculating a desired air-fuel ratio of said air-fuel mixture, based on said detected operating amount of said accelerator pedal and said detected at least one operating parameter of said engine, and correcting means for correcting said energization-stopping timing of said valve-opening electromagnetic element and said energization-starting timing of said valve-closing electromagnetic element in the same direction, based on a difference between said air-fuel ratio detected by said air-fuel ratio detecting means and said desired air-fuel ratio calculated by said desired air-fuel ratio-calculating means.
Claim 7
Dependent Claim
60 words
A control system as claimed in claim 6, wherein said engine has a crankshaft, said correcting means correcting said energization-stopping timing of said valve-opening electromagnetic element and said energization-starting timing of said valve-closing electromagnetic element both in an advanced direction with respect to rotation of said crankshaft when said detected air-fuel ratio is larger than said calculated desired air-fuel ratio.
Claim 8
Dependent Claim
60 words
A control system as claimed in claim 6, wherein said engine has a crankshaft, said correcting means correcting said energization-stopping timing of said valve-opening electromagnetic element and said energization-starting timing of said valve-closing electromagnetic element both in a retarded direction with respect to rotation of said crankshaft when said detected air-fuel ratio is smaller than said calculated desired air-fuel ratio.
References Cited (Backward Citations)
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