Combustion engine with EGR apparatus
First Claim
1. A combustion engine with an EGR apparatus having an EGR path connecting an exhaust path and an intake path, an EGR control valve mounted in the EGR path for controlling an amount of flow of an EGR gas from the exhaust path to the intake path, and a joint between the intake path and the EGR path, the combustion engine comprising:
- detecting means mounted in the intake path downstream of the joint for detecting a concentration of oxygen in an intake air, the intake air containing the EGR gas and an atmospheric air introduced from an atmosphere via the intake path; and
means for calculating a converted actual EGR ratio on the basis of the concentration of oxygen in the intake air, wherein the converted actual EGR ratio is a ratio of an actual EGR ratio to an actual air-fuel ratio of air entering a combustion chamber of the engine and the actual EGR ratio is a ratio of the amount of the EGR gas to an amount of the intake air.
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Abstract
A combustion engine with an EGR apparatus has an EGR path connecting an exhaust path and an intake path. An EGR control valve is mounted in the EGR path for controlling the amount of flow of an EGR gas flowing from the exhaust path to the intake path. The combustion engine also has an oxygen concentration sensor mounted downstream of a joint of the intake path and the EGR path, and in the intake path, for detecting a concentration of oxygen in an intake air. The intake air contains the EGR gas and an air introduced from an atmosphere via the intake path. The combustion engine also has converted actual EGR ratio calculating means for calculating a converted actual EGR ratio on the basis of the concentration of oxygen in the intake air detected by the sensor. The converted actual EGR ratio is a ratio of an actual EGR ratio to an actual air ratio. The actual EGR ratio is a ratio of the amount of the EGR gas to the amount of the intake air.
46 Citations
10 Claims
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1. A combustion engine with an EGR apparatus having an EGR path connecting an exhaust path and an intake path, an EGR control valve mounted in the EGR path for controlling an amount of flow of an EGR gas from the exhaust path to the intake path, and a joint between the intake path and the EGR path, the combustion engine comprising:
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detecting means mounted in the intake path downstream of the joint for detecting a concentration of oxygen in an intake air, the intake air containing the EGR gas and an atmospheric air introduced from an atmosphere via the intake path; and means for calculating a converted actual EGR ratio on the basis of the concentration of oxygen in the intake air, wherein the converted actual EGR ratio is a ratio of an actual EGR ratio to an actual air-fuel ratio of air entering a combustion chamber of the engine and the actual EGR ratio is a ratio of the amount of the EGR gas to an amount of the intake air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification