Locomotive exhaust gas recirculation cooling
First Claim
1. A method of operating an engine generating exhaust, the engine in a vehicle body, the engine further having an intake system turbocharger with an air-cooled intercooler, the method comprising:
- drawing exhaust gas recirculation from upstream of a turbine of the turbocharger;
cooling the exhaust gas recirculation via a first airflow generated by vehicle body motion;
cooling compressed engine induction air in the air-cooled intercooler via a second airflow;
further cooling the exhaust gas recirculation via the second airflow; and
delivering the further cooled exhaust gas recirculation to the cooled compressed engine induction air downstream of the intercooler and downstream of a compressor of the turbocharger, wherein the second airflow cools the exhaust gas recirculation while the exhaust gas recirculation is separate from the compressed engine induction air.
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Accused Products
Abstract
A method of operating an engine having exhaust gas recirculation from an exhaust manifold of the engine to an intake manifold of the engine, the engine in a locomotive or other vehicle car body, the engine further having an intake system turbocharger with an air-cooled intercooler, the method including cooling the exhaust gas recirculation via a first airflow generated by car body motion, cooling compressed engine induction air in the air-cooled intercooler via a second airflow, and cooling the exhaust gas recirculation via the second airflow.
22 Citations
19 Claims
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1. A method of operating an engine generating exhaust, the engine in a vehicle body, the engine further having an intake system turbocharger with an air-cooled intercooler, the method comprising:
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drawing exhaust gas recirculation from upstream of a turbine of the turbocharger; cooling the exhaust gas recirculation via a first airflow generated by vehicle body motion; cooling compressed engine induction air in the air-cooled intercooler via a second airflow; further cooling the exhaust gas recirculation via the second airflow; and delivering the further cooled exhaust gas recirculation to the cooled compressed engine induction air downstream of the intercooler and downstream of a compressor of the turbocharger, wherein the second airflow cools the exhaust gas recirculation while the exhaust gas recirculation is separate from the compressed engine induction air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for a vehicle body, comprising:
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an internal combustion engine having an intake and an exhaust; a liquid coolant engine cooling system; a turbocharger having a turbine and a compressor, the turbine coupled in the engine exhaust and the compressor coupled in the engine intake, the turbine coupled to the compressor; a first intercooler coupled in the engine intake downstream of the compressor, the first intercooler having a first heat exchanger fluidically coupled to the liquid coolant engine cooling system; a second intercooler coupled in the engine intake downstream of the first intercooler, the second intercooler having a second heat exchanger; an exhaust gas recirculation system coupled between the engine intake and the engine exhaust, the exhaust gas recirculation system coupled to the engine exhaust upstream of the turbine, and coupled to the intake downstream of the second intercooler; a first exhaust gas recirculation cooler coupled in the exhaust gas recirculation system; a second exhaust gas recirculation cooler coupled in the exhaust gas recirculation system downstream of the first exhaust gas recirculation cooler; and a fan configured to force air to the second heat exchanger and then to the second exhaust gas recirculation cooler to transfer heat from both induction air and the exhaust gas recirculation. - View Dependent Claims (14, 15, 16, 17)
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18. A method of recirculating exhaust gas from an exhaust of an engine to an intake of the engine, in a vehicle body, the engine further having a turbocharger system with an air-cooled intercooler, comprising:
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directing exhaust gas recirculation from the exhaust upstream of a turbine of the turbocharger system to the intake downstream of the intercooler and downstream of a compressor of the turbocharger system; cooling the exhaust gas recirculation via a first airflow generated by vehicle body motion, the exhaust gas recirculation cooled at a first heat exchanger located at a top of the body; cooling compressed engine induction air in the air-cooled intercooler via a second airflow generated by at least one fan; and cooling the exhaust gas recirculation via the second airflow, the exhaust gas recirculation cooled by the second airflow via a second heat exchanger after the compressed engine induction air is cooled by the second airflow; and adjusting the at least one fan responsive to a temperature of the exhaust gas recirculation. - View Dependent Claims (19)
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Specification