Inferential sensor
First Claim
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1. An inferential exhaust manifold pressure detection device comprising:
- an exhaust gas recirculation (EGR) valve having a first fluid input, a fluid output and a second fluid input;
an exhaust manifold of an engine having a fluid output connected to the first fluid input of the EGR valve and to a fluid input of a turbine, and having a fluid input connected to exhaust ports of cylinders of the engine;
an intake manifold of the engine having a fluid input connected to the fluid output of the EGR valve and to a fluid output of a compressor, and a fluid output connected to intake ports of the cylinders;
a pressure sensor situated in the intake manifold; and
a processor having an electrical signal input connected to the pressure sensor and an electrical signal output; and
wherein;
the processor calculates an inlet pressure of the EGR valve based on a pressure from the pressure sensor;
the processor derives the calculated EGR valve inlet pressure using a turbine power versus compressor power balance in view of an efficiency of the turbine and an efficiency of the compressor; and
the processor determines a control signal for the EGR valve based on the calculated inlet pressure of the EGR and outputs the control signal to the EGR valve.
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Abstract
A system and an approach for determining various pressures or flows in an internal combustion engine, such as a pressure adjacent a recirculation exhaust gas flow through a controlled valve of an engine. Also, among the sensors accommodated in the system, is a pressure sensor sensing a pressure in an intake manifold of the engine.
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Citations
18 Claims
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1. An inferential exhaust manifold pressure detection device comprising:
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an exhaust gas recirculation (EGR) valve having a first fluid input, a fluid output and a second fluid input; an exhaust manifold of an engine having a fluid output connected to the first fluid input of the EGR valve and to a fluid input of a turbine, and having a fluid input connected to exhaust ports of cylinders of the engine; an intake manifold of the engine having a fluid input connected to the fluid output of the EGR valve and to a fluid output of a compressor, and a fluid output connected to intake ports of the cylinders; a pressure sensor situated in the intake manifold; and a processor having an electrical signal input connected to the pressure sensor and an electrical signal output; and wherein; the processor calculates an inlet pressure of the EGR valve based on a pressure from the pressure sensor; the processor derives the calculated EGR valve inlet pressure using a turbine power versus compressor power balance in view of an efficiency of the turbine and an efficiency of the compressor; and the processor determines a control signal for the EGR valve based on the calculated inlet pressure of the EGR and outputs the control signal to the EGR valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An inferential mechanism for determining pressure in an exhaust manifold an engine having a turbocharger comprising:
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an exhaust manifold having a first fluid input connected to an exhaust of an engine and having a fluid output; an exhaust gas recirculation (EGR) valve having a first fluid input connected to the fluid output of the exhaust manifold and having a fluid output; an intake manifold of the engine having a fluid input connected to the fluid output of the EGR valve and having a fluid output; a pressure sensor situated in the intake manifold; and a processor having an electrical signal input connected to the pressure sensor and having an electrical signal output; and wherein the processor; calculates a lower bound for an inlet pressure of the EGR valve based on a maximum possible turbocharger efficiency; uses the lower bound for the inlet pressure of the EGR valve to calculate an interval containing a fresh air mass flow rate; detects a fuel injection offset using the interval on a fresh air mass flow rate; and determines a control signal to adjust fuel injection in view of the fuel injection offset and outputs the control signal to a fuel injector. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for inferring a pressure at an exhaust manifold of an engine having a turbocharger, the method comprising:
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detecting a pressure in an intake manifold connected to an engine; calculating an inlet pressure of an exhaust manifold connected to the engine based on the detected pressure in the intake manifold and a turbine power versus compressor power balance; determining a control signal for an exhaust gas recirculation (EGR) valve based on the calculated inlet pressure in the exhaust manifold; outputting the control signal for the EGR valve to the EGR valve; and wherein the inlet pressure of the exhaust manifold is calculated as an interval of possible values based on intervals of turbocharger efficiency.
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Specification