Exhaust pressure regulating system

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

Patent

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Details

123107, 123 97B, 188273, F02M 2506

Patent

active

041145755

ABSTRACT:
An exhaust pressure regulating system for use with an exhaust gas recirculating system of an internal combustion engine, and particularly for an automobile, utilizing a control valve of the butterfly or poppet type in the exhaust pipe for adjusting the back pressure in the exhaust, a vacuum-sensitive device for actuating the control valve, a pressure-signal passage for applying the pressure in the intake manifold to the vacuum-sensitive device and a pressure-comparing valve sensitive to the quantity of air being taken into the engine and the adjusted back pressure in the exhaust for modulating the pressure in the pressure-signal passage. The pressure-comparing valve includes a pair of interlocked diaphragms actuated in opposed relationship interacting with a biased valve member in the pressure-signal passage, one of the interlocked diaphragms being actuated by the venturi vacuum pressure created by the quantity of air being taken into the engine through the carburetor and the other of the diaphragms being actuated by the adjusted back pressure and tending to open the valve and bleed-off pressure in the pressure-signal passage. A booster valve is preferably used to amplify the venturi vacuum pressure and a pressure-changeover valve, sensitive to operating conditions of the engine, may be disposed in the pressure-signal passage.

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