Electronically controlled exhaust gas recirculation system in internal combustion engine
A description is given of a system for recirculation of exhaust gas in an internal combustion engine provided with an intake passage and an exhaust passage, the system comprising: means for defining a recirculation passage interconnecting said exhaust passage to said induction passage to recirculate a portion of engine exhaust gas; a metering orifice of a fixed area formed in said recirculation passage; vacuum operated valve means for controlling an effective cross-sectional area of said recirculation passage at a section downstream of said metering orifice; pressure modulation means for modulating a vacuum produced in said induction passage with air based on a comparison between a signal negative pressure and an exhaust gas pressure in a control section of said recirculation passage between said metering orifice and said valve means thereby to produce a control negative pressure to operate said valve means; a conduit which connects said induction passage to said pressure modulation means to transmit said vacuum and has an air admission port opening into the atmosphere, said signal negative pressure being produced by modulation of a negative pressure in said conduit with atmospheric air admitted into said conduit through said air admission port; an electromagnetic valve provided to said conduit at a section between said induction passage and said air admission port so as to vary the magnitude of a negative pressure at said air admission port of said conduit thereby to vary the magnitude of said signal negative pressure; a plurality of sensors each for sensing a parameter of engine operating conditions and producing an electrical signal representing the sensed parameter; and electronic control means for providing a control signal to said electromagnetic valve to control the magnitude of said signal negative pressure and hence the magnitude of said control negative pressure.
- Assignee:
- Nissan Motor Co Ltd (Japan)
- Patent Number(s):
- US 4210112
- OSTI ID:
- 5106070
- Resource Relation:
- Patent Priority Date: Priority date 28 Dec 1977, Japan
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EXHAUST RECIRCULATION SYSTEMS
DESIGN
INTERNAL COMBUSTION ENGINES
CONTROL SYSTEMS
ELECTRONIC EQUIPMENT
PRESSURE REGULATORS
VALVES
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
HEAT ENGINES
POLLUTION CONTROL EQUIPMENT
330100* - Internal Combustion Engines
330700 - Advanced Propulsion Systems- Emission Control