Diagnosing system for an exhaust gas recirculation system of an automotive engine

Patent · Tue Apr 25 04:00:00 EDT 1989

OSTI ID:5779082

Ichikawa, K

A diagnosing system is described for an exhaust gas recirculation system, comprising: means for detecting the position of the EGR valve and for producing a position signal dependent on the position of the EGR valve; and trouble detector means responsive to the valve operating signal and to the position signal for producing a trouble signal as an alarm signal when the detecting means produces a position signal of an actual closed state of the EGR value and the control means produces a valve operating signal representing an open state of the EGR valve. The detecting means is a photoelectric transducer, the photoelectric transducer comprises a photodiode and a phototransistor, and the transducer includes a shaft connected to a valve body of the EGR valve. The shaft is movable by movement of the valve body into a path between the photodiode and phototransistor, and the transducer includes a U-shaped holder having the photodiode and phototransistor facing each other on arms of the holder.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4823798
• OSTI ID: 5779082
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
PHOTODETECTORS
PHOTODIODES
PHOTOTRANSISTORS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
TRANSDUCERS
TRANSISTORS
VALVES