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Title: Closed loop exhaust gas recirculation system

Abstract

A closed loop exhaust gas recirculation system for an internal combustion engine is described that has an intake system, an exhaust manifold, a throttle disposed within the intake system for controlling air flow therein, a conduit coupling the exhaust manifold to the intake system for supplying exhaust gases back to the intake system for controlling the generation and emission of oxides of nitrogen and for improving driveability. The system includes a first memory pre-programmed with a look-up table of optimal values of absolute manifold pressure as a function of engine speed and throttle position. The actual operating parameters of absolute manifold pressure, engine speed, and throttle position, or alternatively air flow, are accurately sensed. The actual values of throttle position or air flow and RPM are used to address the first memory which outputs the pre-programmed optimal value of manifold pressure. The actual value of throttle angle or air flow may be compensated for ambient barometric pressure and/or altitude, if desired. The actual value of manifold pressure is compared with the optimal value of MAP/sub 0/. The output of the comparator is used to close the loop and control the position of a valve positioned at least partially within themore » conduit.« less

Inventors:
Publication Date:
OSTI Identifier:
5375048
Patent Number(s):
US 4173205
Assignee:
Bendix Corp.
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 28 Nov 1977
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; EXHAUST RECIRCULATION SYSTEMS; DESIGN; INTERNAL COMBUSTION ENGINES; EXHAUST GASES; NITROGEN OXIDES; AIR POLLUTION ABATEMENT; POLLUTION CONTROL EQUIPMENT; CHALCOGENIDES; ENGINES; EQUIPMENT; EXHAUST SYSTEMS; GASEOUS WASTES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION ABATEMENT; WASTES; 330101* - Internal Combustion Engines- Spark-Ignition; 330700 - Advanced Propulsion Systems- Emission Control

Citation Formats

Toelle, A D. Closed loop exhaust gas recirculation system. United States: N. p., 1979. Web.
Toelle, A D. Closed loop exhaust gas recirculation system. United States.
Toelle, A D. Tue . "Closed loop exhaust gas recirculation system". United States.
@article{osti_5375048,
title = {Closed loop exhaust gas recirculation system},
author = {Toelle, A D},
abstractNote = {A closed loop exhaust gas recirculation system for an internal combustion engine is described that has an intake system, an exhaust manifold, a throttle disposed within the intake system for controlling air flow therein, a conduit coupling the exhaust manifold to the intake system for supplying exhaust gases back to the intake system for controlling the generation and emission of oxides of nitrogen and for improving driveability. The system includes a first memory pre-programmed with a look-up table of optimal values of absolute manifold pressure as a function of engine speed and throttle position. The actual operating parameters of absolute manifold pressure, engine speed, and throttle position, or alternatively air flow, are accurately sensed. The actual values of throttle position or air flow and RPM are used to address the first memory which outputs the pre-programmed optimal value of manifold pressure. The actual value of throttle angle or air flow may be compensated for ambient barometric pressure and/or altitude, if desired. The actual value of manifold pressure is compared with the optimal value of MAP/sub 0/. The output of the comparator is used to close the loop and control the position of a valve positioned at least partially within the conduit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {11}
}