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Method for measuring recirculated exhaust gas flow in a compression-ignition engine
| Details |
Inventors: Kreso, Admir M.;
Assignee: Detroit Diesel Corporation (Detroit, MI)
Primary Examiner: Nguyen; Hoang
Assistant Examiner:
Attorney, Agent or Firm: Brooks & Kushman P.C.
A system and method for measuring the flow rate of recirculated exhaust gas in a compression ignition engine including a plurality of engine sensors having outputs indicative of current engine conditions and a turbocharger. The system includes an exhaust gas recirculation (EGR) valve mounted in the exhaust pipe upstream of the turbocharger for diverting a selectable portion of the exhaust gas for recirculation and combination with the charge air, one or more sensors for sensing current conditions of the recirculated exhaust gas, including temperature and pressure, one or more sensors for sensing current conditions of the intake air, and control logic for determining the flow rate of the recirculated exhaust gas as a function of the sensed conditions. In one embodiment, the system includes an obstruction in the flow path of the recirculated exhaust gas and a differential pressure sensor for determining the pressure differential between a point upstream of the obstruction and a point downstream of the obstruction and control logic for determining the flow rate of the recirculated exhaust gas as a function of the current intake manifold pressure, the recirculated exhaust gas temperature, and the differential pressure drop across the obstruction. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method for measuring the mass flow rate of recirculated exhaust gas in a vehicle having a compression-ignition engine, a plurality of engine sensors having outputs indicative of current engine conditions including an intake manifold pressure sensor, and a variable geometry turbocharger in which geometry is varied by a controllable actuator, the method comprising: sensing intake manifold pressure; controllably diverting a selected portion of exhaust gas for mixture with intake air; sensing temperature in a flow of the recirculated exhaust gas; obstructing the flow of the recirculated exhaust gas; sensing pressure of the recirculated exhaust gas downstream of the obstruction; sensing pressure of the recirculated exhaust gas upstream of the obstruction; and determining flow rate of the recirculated exhaust gas as a function of the intake manifold pressure, recirculated exhaust gas temperature, and differential pressure drop across the obstruction.
2.
The method of claim 1 wherein the exhaust gas is recirculated through a pipe, and wherein the flow of the recirculated exhaust gas is obstructed by providing a thin plate obstructor mounted in the pipe in the path of the recirculated exhaust gas defining an orifice having a diameter of between about 40% and about 80% of the diameter of the recirculated exhaust gas pipe.
3.
The method of claim 2 further including providing a sharp edge on the edge of the plate which defines the orifice.
4.
The method of claim 3 further including bevelling the edge of the obstructor defining the orifice on the downstream side of the orifice at an angle of between about 30.
degree.
and about 60.
degree.
from horizontal.
5.
The method of claim 4 including bevelling the edge of the obstructor defining the orifice on the downstream side of the orifice at an angle of about 45.
degree.
.
6.
The method of claim 2 wherein the flow of the recirculated exhaust gas is obstructed by providing a thin plate obstructor mounted in the pipe in the path of the recirculated exhaust gas defining an orifice having a diameter of about 60% of the diameter of the recirculated exhaust gas pipe
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