International Engine Intellectual Property Company, LLC.
대리인 / 주소
Bach, Mark C.
인용정보
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0인용 특허 :
4
초록▼
A circuit for cooling exhaust gas being recirculated through an EGR system (36) of an engine (10) from an exhaust system (20) successively through first and second heat exchangers (38, 40) to an intake system (16) for entrainment with intake air. Each heat exchanger has a respective coolant inlet th
A circuit for cooling exhaust gas being recirculated through an EGR system (36) of an engine (10) from an exhaust system (20) successively through first and second heat exchangers (38, 40) to an intake system (16) for entrainment with intake air. Each heat exchanger has a respective coolant inlet through which liquid coolant enters and a respective coolant outlet through which liquid coolant exits after having absorbed heat from recirculated exhaust gas. The circuit has a third heat exchanger (32) to which coolant coming from the outlet of one of the first and second heat exchangers rejects heat, and parallel branches (84, 86) through which coolant enters the inlet of the other of the first and second heat exchangers. One of the parallel branches has a fourth heat exchanger (34) to which coolant flowing through that branch rejects heat, and one or more devices (50, 50A) for controlling the quantity of coolant flowing through each branch.
대표청구항▼
1. A method of cooling combustion-created exhaust gas being recirculated in an internal combustion engine from an exhaust system that conveys exhaust gas created by combustion of fuel in engine cylinders to an intake system through which air for supporting the combustion of fuel is delivered to the
1. A method of cooling combustion-created exhaust gas being recirculated in an internal combustion engine from an exhaust system that conveys exhaust gas created by combustion of fuel in engine cylinders to an intake system through which air for supporting the combustion of fuel is delivered to the engine cylinders, thereby entraining the recirculated exhaust gas in the air, the engine having engine structure that contains both the engine cylinders and coolant passageways through which liquid coolant circulates to cool the engine structure, the method comprising: flowing exhaust gas which is being recirculated successively through a first heat exchanger and a second heat exchanger;circulating liquid coolant both in a first loop that comprises a) one of the first and second heat exchangers, b) a third heat exchanger, and c) at least some of the coolant passageways in the engine structure, and in a second loop that comprises d) the other of the first and second heat exchangers, e) first and second branches in parallel flow relation with each other, the first branch comprising a fourth heat exchanger, and f) at least some of the coolant passageways in the engine structure, and controlling how much of the coolant circulating in the second loop is apportioned to the first branch and to the second branch. 2. A method as set forth in claim 1 comprising circulating coolant in the first loop through at least some of the coolant passageways to an exit through which coolant leaves the engine structure, then successively through the first heat exchanger and the third heat exchanger in that order, and ultimately to an entrance for at least some of the coolant passageways. 3. A method as set forth in claim 1 comprising circulating coolant in the second loop through at least some of the coolant passageways to an exit through which coolant leaves the engine structure, then successively through the first and second branches and through the second heat exchanger in that order, and ultimately to an entrance for at least some of the coolant passageways. 4. A method as set forth in claim 1 comprising circulating coolant in the first loop successively through the first heat exchanger and the third heat exchanger in that order, and circulating coolant in the second loop successively through the first and second branches and through the second heat exchanger in that order, and controlling how much of the coolant circulating in the second loop is apportioned to the first branch and to the second branch by operating a control valve to apportion coolant circulating in the second loop to the first branch and to the second branch. 5. A method as set forth in claim 4 including flowing coolant leaving the second branch and coolant leaving the first branch confluently through the second heat exchanger. 6. A method as set forth in claim 4 in which the step of operating a control valve comprises operating the control valve to apportion coolant circulating in the second loop to the first branch and to the second branch as a function of temperature at one or more locations in the engine. 7. A method as set forth in claim 6 including measuring temperature at one or more locations that include a location of recirculated exhaust gas flow between the second heat exchanger and the intake system and a location of entrained air and recirculated exhaust gas flow through the intake system, and using the measured temperatures to operate the control valve. 8. A method of cooling combustion-created exhaust gas being recirculated in an internal combustion engine from an exhaust system that conveys exhaust gas created by combustion of fuel in engine cylinders to an intake system through which air for supporting the combustion of fuel is delivered to the engine cylinders, thereby entraining the recirculated exhaust gas in the air, the engine having engine structure that contains both the engine cylinders and coolant passageways through which liquid coolant circulates to cool the engine structure, the method comprising: recirculating some exhaust gas from the exhaust system successively through a first heat exchanger and a second heat exchanger to the intake system for entrainment with air being conveyed to the engine cylinders;circulating liquid coolant through the coolant passageways in the engine structure and then externally of the engine structure through a first coolant path which, with coolant passageways in the engine structure, forms a first loop and through a second coolant path which, with coolant passageways in the engine structure, forms a second loop, the first coolant path comprising the first heat exchanger and a temperature-controlled valve that returns coolant from the first heat exchanger to the engine structure when engine temperature is below some minimum temperature but diverts coolant to a third heat exchanger when engine temperature is higher than that minimum temperature before returning the coolant to the engine structure, and the second loop comprising a control valve, first and second branches which are in parallel flow relation with each other from the control valve to the second heat exchanger and one of which includes the fourth heat exchanger, and a return from the second heat exchanger to the engine structure; andcontrolling the control valve to apportion coolant between the first branch and the second branch as a function of temperature at one or more locations in the engine. 9. A method as set forth in claim 8 including measuring temperature at one or more locations that include a location of recirculated exhaust gas flow between the second heat exchanger and the intake system and a location of entrained air and recirculated exhaust gas flow through the intake system, and using the measured temperatures to control the control valve. 10. A method for cooling exhaust gas being recirculated through an EGR system of an internal combustion engine from an exhaust system of the engine successively through a first heat exchanger and a second heat exchanger to an intake system of the engine for entrainment with air being conveyed to cylinders of the engine within which fuel is combusted to create the exhaust gas, each heat exchanger comprising a respective coolant inlet through which liquid coolant enters and a respective coolant outlet through which liquid coolant exits after having absorbed heat from exhaust gas being recirculated, the method comprising flowing coolant coming from the outlet of one of the first and second heat exchangers through a third heat exchanger to which the coolant rejects heat, and flowing coolant through parallel branches before entering the inlet of the other of the first and second heat exchangers, including flowing coolant through a fourth heat exchanger in one of the parallel branches to which coolant passing through that one branch rejects heat, and controlling the quantity of coolant flowing through each branch. 11. A method as set forth in claim 10 in which the step of flowing coolant coming from the outlet of one of the first and second heat exchangers through a third heat exchanger at which the coolant rejects heat comprises flowing coolant coming from the outlet of the first heat exchanger through the third heat exchanger. 12. A method as set forth in claim 10 in which the step of controlling the quantity of coolant flowing through each branch comprises controlling operation of a control valve to apportion coolant flow between a first branch and a second branch. 13. A method as set forth in claim 12 including controlling operation of the control valve to apportion coolant flow between the first branch and the second branch as a function of temperature at one or more locations in the engine. 14. A method as set forth in claim 13 including measuring temperature at one or more locations in the engine that include a location of recirculated exhaust gas flow between the second heat exchanger and the intake system and a location of entrained air and recirculated exhaust gas flow through the intake system, and using the measured temperatures to control operation of the control valve. 15. A method as set forth in claim 10 in which the step of controlling the quantity of coolant flowing through each branch comprises controlling operation of a respective valve element to apportion coolant flow between a first branch and a second branch and to throttle flow through one or both of the first branch and the second branch.
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이 특허에 인용된 특허 (4)
Cattani, Luis Carlos; Popadiuc, Peter; Melhem, Bashar Y.; Zielke, Martin R., Adaptive EGR cooling system.
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