Diesel engine exhaust gas recirculation control system

Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture

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36443106, F02M 2506

Patent

active

044401400

ABSTRACT:
An exhaust gas recirculation control system for a vehicle diesel engine with an exhaust gas recirculation passage, including: a fluid pressure operated exhaust gas recirculation valve which controls flow resistance of the recirculation passage according to a control fluid pressure supplied thereto so as to increase the flow resistance up to a maximum substantially infinite value as the control fluid pressure approaches atmospheric pressure; an electrically operated switching over valve, which, when actuated, changes over the control fluid pressure supplied to the exhaust gas recirculation control valve to atmospheric pressure, and an exhaust gas recirculation control signal generating system which generates the control fluid pressure supplied to the exhaust gas recirculation control valve to operate it regularly as well as an electrical signal which actuates the switching over valve when the rate of change of engine load is greater than a certain predetermined value.

REFERENCES:
patent: 4237837 (1980-12-01), Toda et al.
patent: 4281631 (1981-08-01), Yamaguchi
patent: 4300516 (1981-11-01), Hayakawa
patent: 4354476 (1982-10-01), Straubel
patent: 4369753 (1983-01-01), Sugiyama
patent: 4378776 (1983-04-01), Nishimori
patent: 4390001 (1983-06-01), Fusimoto

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