Reversible waste heat recovery system and method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02G-003/00
F01N-003/02
F01K-023/10
F02B-027/04
출원번호
US-0550041
(2012-07-16)
등록번호
US-8893495
(2014-11-25)
발명자
/ 주소
Dane, Marten H.
출원인 / 주소
Cummins Intellectual Property, Inc.
대리인 / 주소
Foley & Lardner LLP
인용정보
피인용 횟수 :
3인용 특허 :
87
초록▼
A waste heat recovery (WHR) system operates in a reverse mode, permitting using the WHR system to transfer heat to the exhaust gas of an internal combustion engine. In another configuration, a WHR system may operate in two modes. The first mode removes heat from exhaust gas of an engine to perform u
A waste heat recovery (WHR) system operates in a reverse mode, permitting using the WHR system to transfer heat to the exhaust gas of an internal combustion engine. In another configuration, a WHR system may operate in two modes. The first mode removes heat from exhaust gas of an engine to perform useful work. The second mode transfers heat to the exhaust gas. The benefit of this flexible system is that a WHR system is adaptable to rapidly heat exhaust gas at startup and during other conditions where the temperature of the exhaust gas is less than a predetermined operating range. Because of the ability to rapidly warm engine exhaust gas, an exhaust gas receiving system, such as an EGR or an aftertreatment system, may function to reduce the emissions of the engine more quickly. Because this system is reversible, it retains the capability of a conventional WHR system.
대표청구항▼
1. A method of heating and cooling an exhaust gas flowing through an exhaust gas circuit of an internal combustion engine, the method comprising: directing the exhaust gas through a heat exchanger positioned along the exhaust gas circuit; andextending a waste heat recovery (WHR) system, including a
1. A method of heating and cooling an exhaust gas flowing through an exhaust gas circuit of an internal combustion engine, the method comprising: directing the exhaust gas through a heat exchanger positioned along the exhaust gas circuit; andextending a waste heat recovery (WHR) system, including a working fluid circuit, through the heat exchanger, wherein the WHR system includes a first mode of operation that provides heated working fluid to the heat exchanger and a second mode of operation to provide cooled working fluid to the heat exchanger, and the working fluid flow through the working fluid circuit is in a first direction in one of the first mode and second mode of operation and is in a second direction in the other of the first mode and the second mode of operation. 2. The internal combustion engine of claim 1, further including a control module connected to a temperature sensor located along the exhaust gas circuit and to the working fluid circuit, wherein the control module receives a temperature signal from the temperature sensor indicative of the temperature of the exhaust gas. 3. The internal combustion engine of claim 2, wherein a temperature signal indicative of an exhaust gas temperature less than a minimum predetermined temperature causes the control module to configure the WHR system to operate in the first mode of operation. 4. The internal combustion engine of claim 3, wherein fluid flow through the working fluid circuit is in a first direction. 5. The internal combustion engine of claim 2, wherein a temperature signal indicative of an exhaust gas temperature greater than a maximum predetermined temperature causes the control module to configure the WHR system to operate in the second mode of operation. 6. The internal combustion engine of claim 5, wherein fluid flow through the working fluid is in a second direction. 7. An internal combustion engine, comprising: an exhaust gas circuit;a heat exchanger positioned along the exhaust gas circuit;an exhaust gas receiving portion positioned along the exhaust gas circuit downstream of the heat exchanger; anda waste heat recovery (WHR) system including a working fluid circuit extending through the heat exchanger, an expansion valve positioned along the working fluid circuit downstream from the heat exchanger, an evaporator positioned along the working fluid circuit downstream from the expansion valve, and a compressor positioned along the working fluid circuit between the evaporator and the heat exchanger, downstream from the evaporator. 8. The internal combustion engine of claim 7, further including a control module connected to the compressor and to at least one temperature sensor located along the exhaust gas flow, wherein the control module is adapted to send a control signal to the compressor in response to a temperature signal from the at least one temperature sensor. 9. The internal combustion engine of claim 7, the working fluid circuit further including a parallel portion having a first branch and a second branch, and the expansion valve is positioned along the first branch and a feed pump is positioned along the second branch, wherein the WHR system is operable in a first mode wherein the working fluid flows through the first branch and a second mode wherein the working fluid flows through the second branch. 10. The internal combustion engine of claim 9, wherein the first branch and the second branch connect to a switching valve and the working fluid flows through the first branch only in the first mode and the working fluid flows through the second branch only in the second mode. 11. The internal combustion engine of claim 10, further including a compressor portion positioned along the first branch, the compressor portion adapted to be driven by a motor generator, and a control module connected to the switching valve, to the motor generator, and to at least one temperature sensor located along the exhaust gas flow, and the control module is adapted to send control signals to the switching valve and the motor generator to configure the WHR system to operate in the first mode in response to the in response to a temperature signal from the at least one temperature sensor. 12. The internal combustion engine of claim 11, wherein the temperature signal from the at least one temperature sensor indicates the temperature of the exhaust gas flow is lower than a predetermined operating temperature range. 13. The internal combustion engine of claim 10, further including a fluid cooling system positioned along the second branch and a control module connected to the feed pump, the switching valve, and at least one temperature sensor located along the exhaust gas flow, wherein the control module is adapted to send control signals to the feed pump and the switching valve to configure the WHR system to operate in the second mode in response to a temperature signal from the at least one temperature sensor. 14. The internal combustion engine of claim 13, wherein the temperature signal from the at least one temperature sensor indicates the temperature of the exhaust gas flow is higher than a predetermined operating temperature range. 15. An internal combustion engine, comprising: an exhaust gas circuit;a heat exchanger positioned along the exhaust gas circuit;an exhaust gas receiving portion positioned along the exhaust gas circuit downstream of the heat exchanger; anda waste heat recovery (WHR) system including a working fluid circuit extending through the heat exchanger, a switching valve positioned along the working fluid circuit, a first branch and a second branch extending between the switching valve and the heat exchanger, an energy conversion portion positioned along the first branch downstream from the switching valve, a fluid containment and cooling system (FCCS) positioned along the first branch between the energy conversion portion and the switching valve, a feed pump positioned along the first branch between the FCCS and the switching valve, an expansion valve positioned along the second branch downstream from the switching valve, a compressor positioned along the second branch downstream of the expansion valve, and an evaporator positioned along the second branch between the expansion valve and the compressor. 16. The internal combustion engine of claim 15, wherein the WHR system is operable in a first mode wherein the working fluid flows from the heat exchanger downstream through the energy conversion portion, then downstream through the FCCS and the feed pump to the switching valve, returning to the heat exchanger. 17. The internal combustion engine of claim 16, wherein the WHR system is operable in a second mode wherein the working fluid flows from heat exchanger downstream to the switching valve, then downstream through the expansion valve and the evaporator, then downstream through the compressor, returning to the heat exchanger. 18. The internal combustion engine of claim 17, further including a control module connected to the switching valve, a motor generator drivingly connected to the turbine-compressor, and at least one temperature sensor located along the exhaust gas flow, and the control module is adapted to send control signals to the switching valve and the motor generator to configure the WHR system to operate in the second mode in response to the in response to a temperature signal from the at least one temperature sensor. 19. The internal combustion engine of claim 18, wherein the temperature signal from the at least one temperature sensor indicates the temperature of the exhaust gas flow is lower than a predetermined operating temperature range. 20. The internal combustion engine of claim 16, further including a control module connected to the feed pump, the switching valve, and at least one temperature sensor located along the exhaust gas flow, and the control module is adapted to send control signals to the feed pump and the switching valve to configure the WHR system to operate in the first mode in response to a temperature signal from the at least one temperature sensor. 21. The internal combustion engine of claim 20, wherein the temperature signal from the at least one temperature sensor indicates the temperature of the exhaust gas flow is higher than a predetermined operating temperature range. 22. The internal combustion engine of claim 15, wherein the WHR system is operable in a first mode wherein the working fluid flows from the heat exchanger downstream through the energy conversion portion, then downstream through the FCCS and the feed pump to the switching valve, returning to the heat exchanger and in a second mode wherein the working fluid flows from heat exchanger downstream to the switching valve, then downstream through the expansion valve, the evaporator, and the compressor, returning to the heat exchanger.
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