Method for managing the relative humidity in the air path of an internal combustion engine equipped with a low pressure EGR system
First Claim
1. A method for estimating a relative humidity in an intake line of an internal combustion engine provided with an intake manifold connected to the intake line, an exhaust line, and a Low Pressure EGR (LPE) conduit that fluidly connects the exhaust line to a connecting point of the intake line, said method comprising:
- calculating a first specific humidity in the exhaust line as a function of an O2 concentration in said exhaust line;
determining an ambient specific humidity;
calculating a second specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the first specific humidity in the exhaust line and the ambient specific humidity; and
calculating the relative humidity in said portion of the intake line, as a function of the specific humidity.
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Accused Products
Abstract
A method is provided for estimating the relative humidity in an intake line of an internal combustion engine provided with an intake manifold connected to the intake line, an exhaust line, and a Low Pressure EGR (LPE) conduit which fluidly connects the exhaust line to a connecting point of said intake line. The method includes, but is not limited to calculating specific humidity in the exhaust line, as a function of the O2 concentration in said exhaust line; determining ambient specific humidity; calculating specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold, as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the specific humidity in said exhaust line and the ambient specific humidity; calculating the relative humidity in said portion of the intake line, as a function of the specific humidity thereof.
30 Citations
25 Claims
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1. A method for estimating a relative humidity in an intake line of an internal combustion engine provided with an intake manifold connected to the intake line, an exhaust line, and a Low Pressure EGR (LPE) conduit that fluidly connects the exhaust line to a connecting point of the intake line, said method comprising:
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calculating a first specific humidity in the exhaust line as a function of an O2 concentration in said exhaust line; determining an ambient specific humidity; calculating a second specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the first specific humidity in the exhaust line and the ambient specific humidity; and calculating the relative humidity in said portion of the intake line, as a function of the specific humidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An internal combustion engine comprising
an intake line; -
an intake manifold connected to the intake line; an exhaust line; a Low Pressure EGR (LPE) conduit that fluidly connects the exhaust line to a connecting point of the intake line; and an Electronic Control Unit (ECU) configured to; determine an ambient specific humidity; calculate specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the specific humidity in the exhaust line and the ambient specific humidity; and calculate a relative humidity in said portion of the intake line, as a function of the specific humidity. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for estimating a relative humidity in an intake line of an internal combustion engine provided with an intake manifold connected to the intake line, an exhaust line, and a Low Pressure EGR (LPE) conduit that fluidly connects the exhaust line to a connecting point of said intake line, said apparatus comprising:
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means for calculating specific humidity in the exhaust line, as a function of an O2 concentration in said exhaust line; means for determining an ambient specific humidity; means for calculating a second specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold, as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the specific humidity in said exhaust line and the ambient specific humidity; and means for calculating the relative humidity in said portion of the intake line, as a function of the specific humidity thereof. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification