US 6,484,500 B1Granted

Two turbocharger engine emission control system

AssigneeCaterpillar Inc.

InventorsGerald N. Coleman, Dennis D. Feucht, James J. Faletti, David A. Pierpont

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Abstract

An internal combustion engine comprises a first exhaust manifold, a second exhaust manifold, a first turbocharger having a first turbine and a first compressor, and a second turbocharger having a second turbine and a second compressor. A second gas inlet port of the second turbine is connected in fluid communication with a second exhaust manifold to receive at least a portion of second combustion gases. A second gas outlet port of the second turbine and the first exhaust manifold are in fluid communication with a first gas inlet port of the first turbine. A valve is connected in fluid communication with the second exhaust manifold to receive a remainder of exhaust gases not included in the at least a portion of the second combustion gases supplied to the second turbine. The valve is connected in fluid communication with a mixer to deliver at least a portion of the remainder of exhaust gases to the mixer for mixing with compressed air in the mixer.

Claims20

Dependent claims

An internal combustion engine, comprising:

a block defining a plurality of combustion cylinders, said plurality of combustion cylinders having at least a first group of combustion cylinders and a second group of combustion cylinders;
an intake manifold connected to said block for providing combustion air to each of the plurality of combustion cylinders;
a first exhaust manifold connected to said first group of combustion cylinders to receive first combustion gases from said first group of combustion cylinders;
a second exhaust manifold connected to said second group of combustion cylinders to receive second combustion gases from said second group of combustion cylinders;
a first turbocharger having a first turbine and a first compressor, said first turbine having a first gas inlet port and a first gas outlet port, said first compressor having a first air inlet port and a first air outlet port, said first gas inlet port being connected in fluid communication with said first exhaust manifold, and said first air inlet port of said first compressor being in fluid communication with the atmosphere;
a second turbocharger having a second turbine and a second compressor, said second turbine having a second gas inlet port and a second gas outlet port, said second compressor having a second air inlet port and a second air outlet port, said second gas inlet port being connected in fluid communication with said second exhaust manifold to receive at least a portion of said second combustion gases, said second gas outlet port being connected in fluid communication with said first gas inlet port of said first turbine, and said second air inlet port of said second compressor being in fluid communication with said first air outlet port of said first compressor;
a mixer having a first input port, a second input port and an output port, said first input port being coupled to said second air outlet port to receive compressed air from said second turbocharger, and said output port being in fluid communication with said intake manifold;
and
a valve connected in fluid communication with said second exhaust manifold to receive a remainder of exhaust gases not included in said at least a portion of said second combustion gases received by said second turbine, said valve being connected in fluid communication with said second input port of said mixer to deliver at least a portion of said remainder of exhaust gases to said mixer for mixing with said compressed air in said mixer.

6 more elements

A work machine, comprising:

a frame;
a block connected to said frame, said block defining a plurality of combustion cylinders, said plurality of combustion cylinders having at least a first group of combustion cylinders and a second group of combustion cylinders;
an intake manifold connected to said block for providing combustion air to each of said plurality of combustion cylinders;
a first exhaust manifold connected to said first group of combustion cylinders to receive first combustion gases from said first group of combustion cylinders;
a second exhaust manifold connected to said second group of combustion cylinders to receive second combustion gases from said second group of combustion cylinders;
a first turbocharger having a first turbine and a first compressor, said first turbine having a first gas inlet port and a first gas outlet port, said first compressor having a first air inlet port and a first air outlet port, said first gas inlet port being connected in fluid communication with said first exhaust manifold, and said first air inlet port of said first compressor being in fluid communication with the atmosphere;
a second turbocharger having a second turbine and a second compressor, said second turbine having a second gas inlet port and a second gas outlet port, said second compressor having a second air inlet port and a second air outlet port, said second gas inlet port being connected in fluid communication with said second exhaust manifold to receive at least a portion of said second combustion gases, said second gas outlet port being connected in fluid communication with said first gas inlet port of said first turbine, and said second air inlet port of said second compressor being in fluid communication with said first air outlet port of said first compressor;
a mixer having a first input port, a second input port and an output port, said first input port being coupled to said second air outlet port to receive compressed air from said second turbocharger, and said output port being in fluid communication with said intake manifold;
and
a valve connected in fluid communication with said second exhaust manifold to receive a remainder of exhaust gases not included in said at least a portion of said second combustion gases received by said second turbine, said valve being connected in fluid communication with said second input port of said mixer to deliver at least a portion of said remainder of exhaust gases to said mixer for mixing with said compressed air in said mixer.

7 more elements

A method of providing engine emission control for an internal combustion engine, comprising the steps of:

providing a first turbocharger having a first turbine and a first compressor, said first turbine having a first gas inlet port and a first gas outlet port, said first compressor having a first air inlet port and a first air outlet port;
providing a second turbocharger having a second turbine and a second compressor, said second turbine having a second gas inlet port and a second gas outlet port, said second compressor having a second air inlet port and a second air outlet port;
supplying first combustion gases from a first group of combustion cylinders to a first exhaust manifold;
supplying second combustion gases from a second group of combustion cylinders to a second exhaust manifold;
supplying said first combustion gases from said first exhaust manifold to said first gas inlet port of said first turbine;
supplying at least a portion of said second combustion gases from said second manifold to said second gas inlet port of said second turbine;
supplying exhaust gases expelled from said second gas outlet port of said second turbine to said first gas inlet port of said first turbine;
supplying fresh air to said first air inlet port of said first compressor from the atmosphere;
compressing said fresh air by said first compressor to form first stage compressed air;
supplying said first stage compressed air from said first compressor to said second air inlet port of said second compressor;
compressing said first stage compressed air with said second compressor to form second stage compressed air;
supplying said second stage compressed air to a mixer;
supplying to said mixer at least a portion of a reminder of exhaust gases not included in said at least a portion of said second combustion gases supplied to said second turbine, for mixing with said second stage compressed air to form a mixture;
and
supplying said mixture to said first group of combustion cylinders and said second group of combustion cylinders.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/939,968Filed 27 Aug 2001
Granted: 26 Nov 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

F02B 37/22
Control of the pumps: by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying…
F02B 37/004
Engines characterised by provision of pumps driven at least for part of the time by exhaust: with exhaust drives arranged in series
F02B 37/013
Engines characterised by provision of pumps driven at least for part of the time by exhaust: with exhaust-driven pumps arranged in series
F02B 37/025
Gas passages between engine outlet and pump drive, e.g. reservoirs: multiple scrolls or multiple gas passages guiding the gas to the pump drive