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U.S. Department of Energy
Office of Scientific and Technical Information

Multi-stage exhaust gas recirculation system

Patent ·
OSTI ID:5581897
An automotive type exhaust gas recirculation (EGR) system has two modes of operation, a first one that regulates EGR flow at a constant percentage rate as a function of throttle valve position independently of exhaust gas backpressure changes, and a second one that provides a variable percentage rate of flow of EGR gases in response to changes in exhaust gas backpressures, both modes utilizing carburetor ported vacuum modified by an air bleed device as the EGR valve opening force.
Assignee:
Ford Motor Co.
Patent Number(s):
US 4398525
OSTI ID:
5581897
Country of Publication:
United States
Language:
English