Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1979-05-30
1980-11-04
Burns, Wendell E.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
123198F, 60278, 60279, F02M 2506, F01N 315
Patent
active
042313384
ABSTRACT:
An internal combustion engine is disclosed which comprises a plurality of cylinders split into first and second groups, the first group of cylinders held in operation independently of engine load conditions, the second group of cylinders having no supply of fuel and fresh air so as to be placed out of operation when the engine is under low load conditions, an exhaust passage connected to the exhaust ports of the first and second groups of cylinders, a sensor provided within the exhaust passage for detecting the oxygen concentration of the exhaust gases passing through the exhaust passage, control means responsive to an output of the sensor for controlling the air/fuel ratio of a mixture produced in each cylinder to an optimum value, an exahust gas purifier provided in the exhaust passage for purifying the exhaust gases passing through the exhaust passage, an exhaust gas recirculation passage having its one end connected to the intake passage of the second group of cylinders and the other end connected to the exhaust passage in arrear of the exhaust gas purifier, and valve means provided in the EGR passage which is open to allow recirculation of exhaust gases through the EGR passage when the engine is under low load conditions.
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Iizuka Haruhiko
Sugasawa Fukashi
Burns Wendell E.
Nissan Motor Company Limited
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