EGR cooler with dual coolant loop
AssigneeModine Manufacturing Company
InventorsDan R. Raduenz, Steven P. Meshenky
Life of this patent
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Abstract
An integrated exhaust gas recirculation (EGR) cooler with dual coolant loops comprises an exhaust gas inlet and an exhaust gas outlet for recirculating exhaust gas. An exhaust gas flow path extends between the exhaust gas inlet and the exhaust gas outlet to direct recirculating exhaust gas from the exhaust gas inlet to the exhaust gas outlet. A first coolant flow path extends between a first coolant inlet and a first coolant outlet to direct a first coolant flow from the EGR cooler in heat exchange relation with the exhaust gas flow path. A second coolant flow path extends between a second coolant inlet and a second coolant outlet to direct a second coolant flow through the EGR cooler in heat exchange relation with the exhaust gas flow path.
Claims29
An integrated exhaust gas recirculation (EGR) cooler with dual coolant loops for cooling recirculation exhaust gas comprising:
- an exhaust gas inlet for recirculating exhaust gas;
- an exhaust gas outlet for recirculating exhaust gas;
- an exhaust gas flow path extending between the exhaust gas inlet and the exhaust gas outlet to direct recirculating exhaust gas from the exhaust gas inlet to the exhaust gas outlet;
- a first coolant inlet;
- a first coolant outlet;
- a first coolant flow path extending between the first coolant inlet and the first coolant outlet to direct a first coolant flow through the EGR cooler in heat exchange relation with the exhaust gas flow path;
- a second coolant inlet;
- a second coolant outlet;
- and
- a second coolant flow path extending between the second coolant inlet and the second coolant outlet to direct a second coolant flow through the EGR cooler in heat exchange relation with the exhaust gas flow path, wherein at least a portion of one of the first and second coolant flow paths is substantially counter to a flow of exhaust gas along the exhaust flow path.
An exhaust gas recirculation (EGR) system with dual coolant loops for use with an engine having an engine exhaust gas recirculation outlet and an engine exhaust gas recirculation inlet, the EGR system comprising:
- an exhaust gas inlet connected to the engine exhaust gas recirculation outlet for receiving recirculating exhaust gas;
- an exhaust gas outlet connected to the engine exhaust gas recirculation inlet for returning cooled recirculating exhaust gas;
- an exhaust gas flow path extending between the exhaust gas inlet and the exhaust gas outlet to direct recirculating exhaust gas from the exhaust gas inlet to the exhaust gas outlet;
- a first coolant inlet;
- a first coolant outlet;
- a first coolant flow path extending between the first coolant inlet and the first coolant outlet to direct a first coolant flow through the EGR cooler in heat exchange relation with the exhaust gas flow path;
- a second coolant inlet;
- a second coolant outlet;
- and
- a second coolant flow path extending between the second coolant inlet and the second coolant outlet to direct a second coolant flow through the EGR cooler in heat exchange relation with the exhaust gas flow path, the first coolant flow path having a different length than the second coolant flow path.
A method of cooling a recirculating exhaust gas flow in an engine system having first and second coolant flow loops comprising:
- rejecting heat from the recirculating exhaust gas flow to the first coolant flow loop in a heat exchanger;
- and
- rejecting heat from the recirculating exhaust gas flow to the second coolant loop in the heat exchangers,
- wherein rejecting heat includes directing exhaust gas between and along surfaces of adjacent stacked plates of a heat exchanger.
Dependencies are inferred from the claim text.