Exhaust gas recirculation and idle speed control device

Patent · Tue Aug 04 00:00:00 EDT 1981

OSTI ID:6071740

Yamaguchi, H

An exhaust gas recirculation and idle speed control device is disclosed that includes an exhaaust recirculation control valve responsive to negative pressure for controlling amounts of exhaust gas recirculation, an idle speed control valve responsive to negative pressure for controlling intake air flow rate when idling, a solenoid valve for regulating intake negative pressure, a changeover valve adapted to be changed to supply the negative pressure regulated by the solenoid valve to any one of the exhaust gas recirculation and idle speed control valves and a control circuit for generating signals depending upon engine operating parameters for controlling the solenoid valve and for changing the changeover valve to the idle speed control valve side when a throttle valve is closed and changing the change-over valve to the exhaust gas recirculation control valve side at the time other than when the throttle valve is closed according to the invention comprises a timer circuit in the control circuit to provide a constant delay time determined by the timer circuit in changing the changeover valve, during which the exhaust gas recirculation control valve is completely closed and thereafter the change-over valve is changed to the idle speed control valve side, thereby controlling exhaust gas recirculation and idle speed by means of only one solenoid valve and preventing malfunctions in changing the exhaust gas recirculation and idle speed controls.

• Assignee: Nissan Motor Co Ltd (Japan)
• Patent Number(s): US 4281631
• OSTI ID: 6071740
• Resource Relation: Patent Priority Date: Priority date 6 Dec 1978, Japan
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
EXHAUST RECIRCULATION SYSTEMS
DESIGN
INTERNAL COMBUSTION ENGINES
AIR POLLUTION CONTROL
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
VALVES
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
HEAT ENGINES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
330700* - Advanced Propulsion Systems- Emission Control