Onboard method of determining EGR flow rate
AssigneeCaterpillar Inc.
InventorsDavid C. Atkinson, Christopher F. Gallmeyer, Ashutosh Katari, Brian V. Tranel
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Abstract
A method of determining and regulating a mass flow rate exhaust gases recirculated into an engine is disclosed. The method may comprise directing the exhaust gases through a venturi and sensing a differential exhaust pressure across the venturi. The method may further include sensing an absolute exhaust pressure at the venturi, and sensing a temperature of the exhaust gases. The method may further include determining the mass flow rate of the exhaust based on the sensed differential fluid pressure, absolute fluid pressure, and temperature.
Claims20
A method of determining a mass flow rate of exhaust gases recirculated into an engine, the method comprising:
- directing the exhaust gases through a venturi;
- sensing a differential exhaust pressure across the venturi;
- sensing an absolute exhaust pressure at the venturi;
- sensing a temperature of the exhaust gases;
- and
- determining the mass flow rate of the exhaust based on the sensed differential fluid pressure, absolute fluid pressure, and temperature.
A method of determining a mass flow rate of exhaust gases recirculated into an engine, the method comprising:
- constricting a flow of exhaust gases;
- and
- determining the mass flow rate of the exhaust gases based on a sensed differential fluid pressure across the constriction, an absolute pressure measured upstream of the constriction, and a sensed temperature of the exhaust gases.
A valve arrangement comprising:
- a venturi;
- a valve element disposed downstream from the venturi and configured to control a flow of exhaust directed through the valve element;
- a differential pressure sensor configured to sense a differential pressure between a location upstream of a constriction of the venturi and a location within the constriction of the venturi;
- an absolute pressure sensor configured to sense an absolute pressure in the venturi;
- a temperature sensor configured to sense a temperature of the flow of exhaust;
- and
- a controller connected to the valve element, the differential pressure sensor, and the absolute pressure sensor, the controller being configured to:
- determine a mass flow rate of the flow of exhaust based on the sensed differential pressure, the sensed absolute pressure, and the sensed temperature, and
- control the valve element to control the flow of exhaust directed through the valve element based on the determined mass flow rate.
Dependencies are inferred from the claim text.