초록 ▼

A multi-cylinder internal combustion engine, such as for a vehicle, having some of the cylinders connected to a first exhaust manifold and the remaining cylinders connected to a second exhaust manifold. The exhaust gases in the first exhaust manifold are used for driving the turbine section of a fir

A multi-cylinder internal combustion engine, such as for a vehicle, having some of the cylinders connected to a first exhaust manifold and the remaining cylinders connected to a second exhaust manifold. The exhaust gases in the first exhaust manifold are used for driving the turbine section of a first turbocharger, the compressor section of which forces the air or air-fuel mixture into the intake manifold for distribution to the cylinders. The exhaust gases discharged from the first turbocharger are then supplied through an intermediate conduit to the compressor section of a second turbocharger, the turbine section of which is driven by the exhaust gases from the second exhaust manifold. The compressor section of the second turbocharger communicates with the intake manifold so that the fraction of the exhaust gases which are pressurized by the second turbocharger are mixed with the air or air-fuel mixture therein. A part of the exhaust gases are thus recycled through the cylinders to achieve higher compression ratios while utilizing leaner fuel mixtures.

대표청구항 ▼

In an internal combustion engine having a plurality of piston-containing cylinders each defining a combustion chamber, intake manifold means communicating with said combustion chambers, an intake conduit communicating with said intake manifold means for supplying air thereto, an exhaust manifold com

In an internal combustion engine having a plurality of piston-containing cylinders each defining a combustion chamber, intake manifold means communicating with said combustion chambers, an intake conduit communicating with said intake manifold means for supplying air thereto, an exhaust manifold communicating with said combustion chambers for receiving therefrom the hot exhaust gases, and first turbocharger means for pressurizing the air supplied to said intake manifold means, said first turbocharger means including a rotatable turbine section drivingly connected to and rotatably driving a compressor section, said compressor section being associated with said intake conduit for pressurizing the air which is supplied to said intake manifold means, and a first exhaust conduit providing communication between said exhaust manifold means and said turbine section for rotatably driving said turbine section by the hot exhaust gases which flow through said first exhaust conduit, the improvement comprising second turbocharger means for pressurizing and supplying at least a part of the hot exhaust gases to said intake manifold means, said second turbocharger means including a rotatable turbine part drivingly connected to a rotatable compressor part, a second exhaust conduit communicating between said exhaust manifold means and said turbine part for supplying at least a part of the hot exhaust gases to said turbine part for rotatably driving same, intermediate passage means connected between the discharge of said turbine section and the inlet of said compressor part for supplying the exhaust gases from said first turbocharger means to the compressor part of said second turbocharger means for effecting pressurization of said exhaust gases, and an inlet conduit connected between said compressor part and said intake manifold means for supplying said pressurized exhaust gases from said compressor part to said intake manifold means for mixing with the pressurized air supplied through said intake conduit, the pressurized mixture of exhaust gases and air within said intake manifold means being supplied to said combustion chambers.