Method and system for turbocharging an engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-023/00
F02M-025/07
F02M-025/06
F01N-005/04
F01L-001/34
F02D-013/02
F02M-035/108
F02B-037/00
F02B-037/18
F02D-043/00
F02B-075/18
출원번호
US-0295163
(2014-06-03)
등록번호
US-9470182
(2016-10-18)
발명자
/ 주소
Ulrey, Joseph Norman
Pursifull, Ross Dykstra
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
17
초록
A method for improving operation of a turbocharged engine is presented. In one embodiment, the method may reduce engine emissions and improve engine efficiency during an engine start.
대표청구항▼
1. A method for controlling exhaust gas of an engine comprising: isolating blow-down gases of a cylinder to a first exhaust conduit and residual gases to a second exhaust conduit, the exhaust conduits coupled to the cylinder via first and second exhaust valves;recovering heat from a first portion of
1. A method for controlling exhaust gas of an engine comprising: isolating blow-down gases of a cylinder to a first exhaust conduit and residual gases to a second exhaust conduit, the exhaust conduits coupled to the cylinder via first and second exhaust valves;recovering heat from a first portion of the gases in the first exhaust conduit to a liquid via a heat recovery device, and then returning the cooled gases to the second exhaust conduit that is in communication with the first exhaust conduit downstream of the heat recovery device, the second exhaust conduit including a first catalyst and a second catalyst, the first catalyst upstream of the second catalyst;directing a second portion of the gases in the first exhaust conduit to a turbine positioned in a third exhaust conduit; andadjusting, via a controller, a turbine shut-off valve, positioned downstream of the turbine, based on an operating condition of the engine received at the controller, to flow exhaust from the third exhaust conduit into the second exhaust conduit, wherein the third exhaust conduit is coupled to the second exhaust conduit at a location between the first catalyst and the second catalyst. 2. The method of claim 1, wherein adjusting the turbine shut-off valve includes opening the turbine shut-off valve in response to an increase in an operator engine torque demand and closing the turbine shut-off valve in response to a decrease in the operator engine torque demand. 3. The method of claim 1, where a portion of the blow-down gases of the cylinder are directed to an intake manifold of a turbocharged engine. 4. The method of claim 1, where the heat is recovered via a gas-to-liquid heat exchanger. 5. The method of claim 1, further comprising combining the first portion of the gases with the residual gases at a location upstream of the first catalyst in a direction of exhaust flow. 6. The method of claim 5, further comprising directing the second portion of the gases to an intake manifold. 7. A method for controlling exhaust gas of an engine comprising: while the engine is operating, isolating blow-down gases of a cylinder to a first exhaust conduit and residual gases to a second exhaust conduit via a first exhaust cam profile and a second exhaust cam profile, the exhaust conduits coupled to the cylinder via first and second exhaust valves;recovering heat from a first portion of the gases in the first exhaust conduit to a liquid via a heat recovery device, arranged in a first branch of the first exhaust conduit, and then returning the cooled gases to the second exhaust conduit that is in communication with the first exhaust conduit downstream of the heat recovery device, the second exhaust conduit including a first catalyst and a second catalyst, the first catalyst upstream of the second catalyst; andvia a controller of the engine, opening a turbine shut-off valve to draw a second, remaining portion of the gases in the first exhaust conduit into the second exhaust conduit downstream of the first catalyst and upstream of the second catalyst via a turbocharger turbine, the turbine shut-off valve positioned downstream of an outlet of the turbine, and the turbine located in a second branch of the first exhaust conduit, the second branch positioned upstream of the heat recovery device. 8. The method of claim 7, further comprising transferring heat energy from the heat recovery device to engine coolant. 9. The method of claim 7, further comprising transferring heat energy from the heat recovery device to engine oil. 10. The method of claim 7, where the first exhaust cam profile opens a first exhaust valve and the second exhaust cam profile opens a second exhaust valve. 11. The method of claim 10, where the first exhaust cam profile includes a first exhaust valve opening duration and the second exhaust cam profile includes a second exhaust valve opening duration, where opening of the second exhaust valve occurs later than opening of the first exhaust valve. 12. The method of claim 11, where the first exhaust cam profile includes an exhaust valve lift that opens and closes the first exhaust valve before a piston of the cylinder reaches a bottom dead center (BDC) expansion stroke of the cylinder. 13. An engine system, comprising: a camshaft including a first exhaust cam profile for a first exhaust valve of a cylinder and a second exhaust cam profile for a second exhaust valve of the cylinder, the first exhaust valve controlling exhaust flow to a first exhaust port of the cylinder, the second exhaust valve controlling exhaust flow to a second exhaust port of the cylinder;a first exhaust conduit extending from the first exhaust port of the cylinder;a second exhaust conduit extending from the second exhaust port of the cylinder, the second exhaust port isolated from the first exhaust port, the second exhaust conduit including a first catalyst and a second catalyst, the first catalyst upstream of the second catalyst;a gas-to-liquid heat exchanger located in a first branch of the first exhaust conduit, an outlet of the gas-to-liquid heat exchanger directed to an intake manifold and the second exhaust conduit;a turbocharger turbine located in a second branch of the first exhaust conduit, the second branch coupled to the first branch upstream of the heat exchanger;wherein an outlet of the turbine is coupled to the second exhaust conduit at a location between the first catalyst and the second catalyst; anda turbine shut-off valve located downstream of the outlet of the turbine in a third exhaust conduit positioned downstream of the second branch of the first exhaust conduit. 14. The engine system of claim 13, where the first exhaust cam profile includes a first lift amount and the second exhaust cam profile includes a second lift amount. 15. The engine system of claim 13, where the first exhaust cam profile includes a first opening duration and the second exhaust cam profile includes a second opening duration, where the first opening duration causes the first exhaust valve to open and close before a bottom dead center (BDC) expansion stroke of the cylinder and opening of the second exhaust valve occurs later than opening of the first exhaust valve.
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