Inferential sensor
AssigneeGarrett Transportation I Inc.
InventorsDaniel Pachner, Michael Uchanski, Lucas Lansky
Life of this patent
Estimating the term…
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.
Claims18
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.
An inferential mechanism for determining pressure in an exhaust manifold an engine having a turbocharger comprising:
- 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.
A method for inferring a pressure at an exhaust manifold of an engine having a turbocharger, the method comprising:
- 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.
Dependencies are inferred from the claim text.