Electronic feedback EGR valve
An improved EGR valve controller is described which consists of: (A) body means defining an exhaust gas recirculation passage having an inlet, an outlet and a valve seat disposed in the passage intermediate the inlet and the outlet; (B) a valve member disposed in the EGR passage, the valve member moveable with respect to the valve seat for controlling flow through the passage; (C) pressure responsive means defining in cooperation with the body means a vacuum signal chamber; (D) means defining a vacuum connector having a port communicating with the vacuum signal chamber, the connector adapted for connection to a vacuum source; (E) actuator means operatively interconnecting the pressure responsive means and the valve member for effecting movement of the latter in response to pressure changes in the vacuum chamber; (F) means defining an EGR flow limiting orifice in the EGR passage upstream of the valve seat; (G) means defining a pressure tap in the EGR passage intermediate the valve seat and the flow limiting orifice; (H) pressure transducer means having a sensing port and mounted on the body means remote from the EGR passage with the sensing port vertically at a level above the pressure tap when the controller is installed on an engine; (I) conduit means extending externally of the body means and interconnecting the pressure tap and the transducer sensing port the conduit means including a section disposed externally of the body means and operative to thermally isolate the transducer port from the pressure top. The transducer means is operative to emit an electrical signal having certain characteristics indicative of the pressure sensed in the tap.
- Assignee:
- Eaton Corp., Cleveland, OH
- Patent Number(s):
- US 4566423
- OSTI ID:
- 5828002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTUATORS
AIR POLLUTION ABATEMENT
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FEEDBACK
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
PRESSURE MEASUREMENT
REMOTE CONTROL
SIGNALS
TRANSDUCERS
VACUUM SYSTEMS
VALVES