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Title: Closed loop programmable EGR with coolant temperature sensitivity

Abstract

A closed loop programmable EGR control system is disclosed. The EGR control system comprises a first read only memory having a look up table of base EGR pulse widths as a function of engine speed and absolute manifold pressure. This base EGR pulse width is corrected to a total desired pulse width by adding a correction pulse width obtained from a second read only memory. The second ROM stores values of the correction pulse width in a look up table as a function of engine speed and engine coolant temperature. This desired value of EGR pulse width is then compared to the actual EGR flow as sensed directly by a differential pressure transducer located in the exhaust gas recirculation conduit and an error signal is generated therefrom. The error signal is subsequently used to operate a solenoid pilot valve that alternately applies either a vacuum or atmospheric vent at a controllable rate to an EGR valve regulating the amount of exhaust gas recirculated to thereby reduce the error between the actual and desired EGR values.

Inventors:
Publication Date:
OSTI Identifier:
6062362
Patent Number(s):
US 4164206
Assignee:
Bendix Corp.
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 19 Jan 1978
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; AUTOMOBILES; EXHAUST RECIRCULATION SYSTEMS; DESIGN; AIR POLLUTION CONTROL; CLOSED-CYCLE SYSTEMS; INTERNAL COMBUSTION ENGINES; NITROGEN OXIDES; CHALCOGENIDES; ENGINES; EQUIPMENT; EXHAUST SYSTEMS; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; POLLUTION CONTROL EQUIPMENT; VEHICLES; 330700* - Advanced Propulsion Systems- Emission Control

Citation Formats

Toelle, A D. Closed loop programmable EGR with coolant temperature sensitivity. United States: N. p., 1979. Web.
Toelle, A D. Closed loop programmable EGR with coolant temperature sensitivity. United States.
Toelle, A D. Tue . "Closed loop programmable EGR with coolant temperature sensitivity". United States.
@article{osti_6062362,
title = {Closed loop programmable EGR with coolant temperature sensitivity},
author = {Toelle, A D},
abstractNote = {A closed loop programmable EGR control system is disclosed. The EGR control system comprises a first read only memory having a look up table of base EGR pulse widths as a function of engine speed and absolute manifold pressure. This base EGR pulse width is corrected to a total desired pulse width by adding a correction pulse width obtained from a second read only memory. The second ROM stores values of the correction pulse width in a look up table as a function of engine speed and engine coolant temperature. This desired value of EGR pulse width is then compared to the actual EGR flow as sensed directly by a differential pressure transducer located in the exhaust gas recirculation conduit and an error signal is generated therefrom. The error signal is subsequently used to operate a solenoid pilot valve that alternately applies either a vacuum or atmospheric vent at a controllable rate to an EGR valve regulating the amount of exhaust gas recirculated to thereby reduce the error between the actual and desired EGR values.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {8}
}