Multicylinder internal combustion engine
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorMotoo Suzuki
Life of this patent
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Abstract
An engine has separate cylinders to which rich and lean mixtures are respectively supplied. A common carburetor that is set to make a rich air-fuel mixture is used for feeding both rich and lean mixtures. An air-supply passage is connected to an intake manifold that communicates the carburetor with the cylinder to which lean mixture is fed. The air introduced from the air-supply passage is mixed with the rich mixture to produce the desired lean mixture. A valve unit is installed in the air-supply passage, so that the rich mixture is fed to all the cylinders during high-load operation by closing the valve.
Claims14
A multicylinder internal combustion engine comprising:
- a plurality of cylinders;
- means for making an air-fuel rich mixture to be supplied to said cylinders;
- first passages for supplying the rich mixture made by said making means to some of said cylinders;
- second passages for supplying the rich mixture to the remaining ones of said cylinders;
- an air-supply passage having one end opening in said second passages and the other end communicating with the atmosphere;
- and valve means disposed in said air-supply passage operative to close the passage under high load conditions so that the rich mixture is supplied to all the cylinders under high load conditions, and, under other operating conditions, the rich mixture is supplied only to the cylinders communicating with the first passages while a lean mixture comprised of air introduced through the air-supply passage mixed with the rich mixture is supplied to the other cylinders comunicating with the second passages.
Dependencies are inferred from the claim text.