Exhaust gas recirculation control method and apparatus for a die

Details Exhaust gas recirculation control method and apparatus for a die Exhaust gas recirculation control method and apparatus for a die

1982-08-03

1984-08-21

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123569, F02M 2506

Patent

active

044664168

ABSTRACT:
An exhaust gas recirculation method and apparatus controls the duty cycles of a throttle valve provided in an air intake passageway leading to a diesel engine, and an exhaust gas recirculation valve provided in an exhaust gas recirculation passageway connecting the air intake passageway and an exhaust gas passage, according to a predetermined relationship. The respective valves are controlled via corresponding diaphragm actuators and electromagnetic valves for actuating the actuators by a control unit which produces duty cycle control signals for the respective electromagnetic valves in accordance with sensed operating parameter signals which represent engine speed, load and coolant temperature. The control of the throttle and EGR valves are related so that the throttle valve is held fully open when the EGR valve is not fully open. This ensures the absolute minimum emission of exhaust HC throughout the range of throttle-EGR control.

REFERENCES:
patent: 4181944 (1980-01-01), Yamauchi et al.
patent: 4237837 (1980-12-01), Toda et al.
patent: 4304210 (1981-12-01), Hayakawa
patent: 4369753 (1983-01-01), Sugiyama
patent: 4387694 (1983-06-01), Yoshiba et al.
1981 Datsun 810 Diesel Service Manual, (Publication No. SM1E-910SU0, Printing Mar. 1981): Chapter, Emission Control System.

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