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US 8,555,638 B2Granted
Internal combustion engine with improved exhaust manifold
AssigneeCaterpillar Inc.
InventorsAaron Luft, Lucian Stanciu, Catalin Tiru, Jeremy Byrd
Life of this patent
Estimating the term…
Abstract
An internal combustion engine includes a plurality of combustion cylinders, at least one turbocharger, an air supply line, an exhaust gas line and an exhaust gas recirculation system. An exhaust manifold of the exhaust gas line may have both non-direction specific and modular pulse exhaust manifold elements. If the internal combustion engine has dual cylinder banks, an exhaust gas balance tube may extend between exhaust gas lines of the cylinder banks and be fluidly connected to an exhaust manifold between the ends thereof.
Claims18
An internal combustion engine having a plurality of combustion cylinders, comprising:
- a first cylinder bank;
- a second cylinder bank having a first cylinder group and a second cylinder group;
- a first exhaust gas line fluidly connected to the first cylinder bank, the first exhaust gas line including a first exhaust manifold;
- a second exhaust gas line including a second exhaust manifold, the second exhaust manifold having a first section and a second section, the first section being fluidly connected to the first cylinder group of the second cylinder bank and the second section being fluidly connected to the second cylinder group of the second cylinder bank;
- a first turbocharger fluidly connected to the first exhaust gas line;
- a second turbocharger fluidly connected to the second exhaust gas line;
- an air supply line for supplying air to the first cylinder bank and the second cylinder bank;
- an exhaust gas recirculation system for recirculating exhaust gas from the first exhaust gas line to the air supply line;
- and
- an exhaust gas balance tube fluidly connecting the first exhaust gas line and the second exhaust manifold, the exhaust gas balance tube being fluidly connected to the second exhaust manifold between the first section of the second exhaust manifold and the second section of the second exhaust manifold.
7 more elements
An internal combustion engine comprising:
- a first cylinder bank;
- a second cylinder bank having a first cylinder group and a second cylinder group, the second cylinder bank being generally parallel to the first cylinder bank;
- a first exhaust gas line fluidly connected to the first cylinder bank, the first exhaust gas line including a generally linear first exhaust manifold;
- a second exhaust gas line including a generally linear second exhaust manifold, the second exhaust manifold being generally parallel to the first exhaust manifold and having a first section and a second section, the first section being fluidly connected to the first cylinder group of the second cylinder bank and the second section being fluidly connected to the second cylinder group of the second cylinder bank;
- a first turbocharger fluidly connected to the first exhaust gas line;
- a second turbocharger fluidly connected to the second exhaust gas line;
- an air supply line for supplying air to the first cylinder bank and the second cylinder bank;
- an exhaust gas recirculation system for recirculating exhaust gas from the first exhaust gas line to the air supply line;
- and
- an exhaust gas balance tube fluidly connecting the first exhaust gas line and the second exhaust manifold, the exhaust gas balance tube being fluidly connected to the second exhaust manifold at an upstream balance tube port positioned between the first section of the second exhaust manifold and the second section of the second exhaust manifold.
7 more elements
An internal combustion engine comprising:
- a first cylinder bank having a plurality of combustion cylinders, the plurality of combustion cylinders defining a first cylinder group and a second cylinder group;
- an exhaust gas line having an exhaust manifold with a first end and an exhaust end, the exhaust manifold having a first section and a second section with the second section being closer to the exhaust end than the first section, and an exhaust gas control device positioned between the first section and the second section, the exhaust manifold having a plurality of exhaust manifold elements, each exhaust manifold element having a duct component extending along a generally linear tube-like duct portion of the exhaust manifold and a pipe component fluidly connecting the duct component to one of the combustion cylinders, the first section of the exhaust manifold being fluidly connected to the first cylinder group and the second section of the exhaust manifold being fluidly connected to the second cylinder group, the first section including at least one exhaust manifold element configured as a non-direction specific exhaust manifold element, the pipe component of each non-direction specific exhaust manifold element being a non-direction specific pipe component fluidly connecting the duct component of the non-direction specific exhaust manifold element to one of the combustion cylinders of the first cylinder group, and the second section including at least one exhaust manifold element configured as a modular pulse exhaust manifold element, the pipe component of each modular pulse exhaust manifold element being a modular pulse pipe component fluidly connecting the duct component of the modular pulse exhaust manifold element to one of the combustion cylinders of the second cylinder group;
- a turbocharger fluidly connected to the exhaust gas line;
- an air supply line for supplying air to the combustion cylinders;
- an exhaust gas recirculation system for recirculating exhaust gas from the exhaust gas line to the air supply line;
- and
- a second cylinder bank, a second exhaust gas line having a second exhaust manifold fluidly connected to the second cylinder bank, the second exhaust manifold having a first end and an exhaust end, and a plurality of the exhaust manifold elements configured as modular pulse exhaust manifold elements, the pipe component of each modular pulse exhaust manifold element being a modular pulse pipe component fluidly connecting the duct component of the modular pulse exhaust manifold element to one of the plurality of combustion cylinders of the second cylinder bank and having a direction biased flow pattern to generate an exhaust gas flow generally in a direction towards the exhaust end of the second exhaust manifold, and a second turbocharger fluidly connected to the second exhaust gas line;
- and
- an exhaust gas balance tube fluidly connecting the exhaust manifold and the second exhaust manifold, the second exhaust manifold having a first section and a second section, the first section of the second exhaust manifold being fluidly connected to a first cylinder group of the plurality of combustion cylinders of the second cylinder bank and the second section of the second exhaust manifold being fluidly connected to a second cylinder group of the plurality of combustion cylinders of the second cylinder bank, and the exhaust gas balance tube being fluidly connected to the second exhaust manifold between the first section of the second exhaust manifold and the second section of the second exhaust manifold.
6 more elements
Dependencies are inferred from the claim text.