Internal combustion engine with variable compression ratio
First Claim
1. An internal combustion engine with a variable compression ratio comprising:
- exhaust gas purifying catalyst provided in an exhaust passage compression ratio changing mechanism for changing the compression ratio by changing the volume of a combustion chamber; and
, control unit for controlling a factor that influences the air-fuel ratio in such a way that in a transition period during which the compression ratio is changed, the air-fuel ratio of air-fuel mixture in a cylinder becomes substantially equal to the air-fuel ratio before and after the change of the compression ratio.
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Accused Products
Abstract
In a variable compression ratio internal combustion engine in which the compression ratio is changed by changing the combustion chamber volume, the present invention enables to inhibit irregularities in the air-fuel ratio involved by changing of the combustion chamber volume. In a transition period during which the compression ratio is changed, the actual volume of the combustion chamber realized by a compression ratio changing mechanism is detected. A factor that influences the air-fuel ratio (for example, fuel injection quantity, cylinder intake air quantity or amount of EGR) is controlled based on the actual volume of the combustion chamber thus detected to make the air-fuel ratio substantially equal to that before and after the change of the compression ratio.
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Citations
26 Claims
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1. An internal combustion engine with a variable compression ratio comprising:
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exhaust gas purifying catalyst provided in an exhaust passage compression ratio changing mechanism for changing the compression ratio by changing the volume of a combustion chamber; and
,control unit for controlling a factor that influences the air-fuel ratio in such a way that in a transition period during which the compression ratio is changed, the air-fuel ratio of air-fuel mixture in a cylinder becomes substantially equal to the air-fuel ratio before and after the change of the compression ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A control apparatus for an internal combustion engine with a variable compression ratio comprising:
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a compression ratio changing mechanism for changing the compression ratio by changing the volume of a combustion chamber;
combustion chamber volume detection apparatus for detecting the actual volume of the combustion chamber realized by said compression ratio changing mechanism; and
control unit for controlling a factor that influences the air-fuel ratio based on said actual volume of the combustion chamber detected by said combustion chamber volume detection apparatus. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification