Exhaust gas recirculation control system

Patent · Tue Sep 01 00:00:00 EDT 1987

OSTI ID:5926342

Egle, L E

A system is described for controlling exhaust gas recirculation (EGR) in an internal combustion engine: (a) base means defining an exhaust gas inlet port, an exhaust gas outlet port and an EGR passage communicating the inlet port with the outlet port, the base means adapted for attachment to an exhaust passage and a combustion chamber inlet passage of an engine; (b) flow valve means disposed in the passage and including a valve seat and poppet member operable upon movement with respect to the seat for controlling EGR flow between the inlet and the outlet; (c) actuator means operable upon receipt of an electrical control signal to move the poppet, the actuator means including: (i) a stepper motor, (ii) an axial lead means operatively rotated by the stepper motor, (iii) follower means guided for axial movement, and operably connected to move the poppet in response to rotation of the lead means; (d) plate means disposed in the EGR passage between the seat and the outlet port and defining a flow measuring orifice; (e) pressure tap means operative to sense the pressure in the passage on the upstream and downstream sides of the orifice; (f) transducer means operative in response to the pressure in the pressure tap means to provide the electrical control signal for the stepper motor.

• Assignee: Eaton Corp., Cleveland, OH
• Patent Number(s): US 4690120
• OSTI ID: 5926342
• Resource Relation: Patent File Date: Filed date 25 Feb 1986
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
EXHAUST RECIRCULATION SYSTEMS
CONTROL SYSTEMS
INTERNAL COMBUSTION ENGINES
EDDY CURRENTS
EXHAUST GASES
GAS FLOW
INTAKE STRUCTURES
MOTORS
PRESSURE GAGES
SIGNALS
TRANSDUCERS
VALVES
CONTROL EQUIPMENT
CURRENTS
ELECTRIC CURRENTS
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
POLLUTION CONTROL EQUIPMENT
WASTES
330700* - Advanced Propulsion Systems- Emission Control
330100 - Internal Combustion Engines