Control of EGR in a closed loop EFI engine

Patent · Tue Feb 26 00:00:00 EST 1980

OSTI ID:5684179

Taplin, L B

A system is disclosed for controlling exhaust gas recirculation in an internal combustion engine having fuel supply means controlled by an electronic control unit. A sensor determines whether the air/fuel mixture of exhaust gases is above or below stoichiometric conditions to generate a feedback signal for the electronic control unit so as tend towards said stoichiometric conditions. Exhaust gas recirculation is controlled by an EGR valve responsive to a command signal. The command signal is equal to the sum of a first signal substantially equal to the control signal generated by an EGR program voltage plus a correction signal, and of a second square wave signal having a given frequency. The correction signal is a function of the amplitude of the frequency component of said feedback, having said given frequency.

• Assignee: Bendix Corp The
• Patent Number(s): US 4190029
• OSTI ID: 5684179
• Resource Relation: Patent File Date: Filed date 30 Oct 1978; Other Information: PAT-APPL-955851
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
EXHAUST RECIRCULATION SYSTEMS
CLOSED-LOOP CONTROL
CONTROL SYSTEMS
INTERNAL COMBUSTION ENGINES
ELECTRONIC EQUIPMENT
EXHAUST GASES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
CONTROL
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
POLLUTION CONTROL EQUIPMENT
WASTES
330100* - Internal Combustion Engines
330700 - Advanced Propulsion Systems- Emission Control