Exhaust gas recirculation control device
An exhaust gas recirculation control device is described for use in an internal combustion engine having an intake manifold, an exhaust pipe and an exhaust gas recirculation connecting pipe. The control device is comprised of (1) an exhaust gas flow restrictor in the recirculation pipe; (2) an exhaust gas flow control valve mounted downstream of the restrictor; (3) a pressure responsive membrane between the restrictor and the flow control valve; (4) a housing with a chamber having an air bleed hole and another chamber having a valve seat; (5) a valve normally seated on the valve seat to block communication between the first and second chambers, and connected to the pressure responsive membrane, the valve being biased by a spring such that, above a predetermined pressure, the valve opening increases with pressure; (6) a diaphragm in the first chamber dividing it into an atmospheric chamber communicating with the atmosphere through the air bleed hole and a vacuum chamber communicating with the atmospheric chamber through another hole, the diaphragm connected to the valve to prevent the transmission of oscillations in intake manifold vacuum to a vacuum responsive membrane and to the flow control valve; (7) a vacuum responsive membrane communicated with vacuum chamber of the first chamber and linked with the flow control valve. For pressures above the predetermined pressure, the valve opens the intake manifold vacuum to the vacuum chamber of the first chamber and to the air bleed hole. When air sucked through the air bleed hole reaches a predetermined maximum flow level, the vacuum responsive membrane opens the flow control valve according to the pressure level.
- Assignee:
- Nissan Motor Co., Ltd.
- Patent Number(s):
- US 3931813
- OSTI ID:
- 7355434
- Country of Publication:
- United States
- Language:
- English
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