Exhaust gas recirculation system with engine load dependent perf

Details Exhaust gas recirculation system with engine load dependent perf Exhaust gas recirculation system with engine load dependent perf

1979-07-18

1981-06-16

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02B 4708

Patent

active

042730929

ABSTRACT:
An exhaust gas recirculation system is disclosed, which is of the well-known type wherein an exhaust gas recirculation control valve in the exhaust gas recirculation passage controls the amount of exhaust gas recirculation. An orifice element, upstream of the exhaust gas recirculation valve in the passage, defines a pressure chamber between itself and the exhaust gas recirculation control valve. The vacuum supplied to the diaphragm chamber of the exhaust gas recirculation control valve is modified by a vacuum adjustment valve with two chambers on opposite sides of a biased diaphragm, the one chamber being supplied with the pressure in the pressure chamber, and the other chamber being supplied with atmospheric air through an air bleed means at a certain rate. The improvement of the present invention comprises varying the performance of the supply of air through the air bleed means in accordance with the load on the engine. In preferred embodiments the air bleed means incorporates an air bleed control valve which varies the amount of air bled in various ways in accordance with the vacuum at various particular points in the inlet manifold.

REFERENCES:
patent: 4092960 (1978-06-01), Nohira et al.
patent: 4180035 (1975-12-01), Saiki et al.

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