[특허]Methods and system for selecting a location for water injection in an engine

Ford Global Technologies, LLC

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특허 상세정보

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Methods and system for selecting a location for water injection in an engine

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02B-047/02 F02M-025/022 F02B-075/22 F02D-035/02 F02D-041/00 F02D-041/14 F02M-025/028 F02M-025/03 F02D-041/30 F02D-037/02
출원번호	US-0226548 (2016-08-02)
등록번호	US-10184429 (2019-01-22)
발명자 / 주소	Hakeem, Mohannad Surnilla, Gopichandra Smith, Stephen B. Ulrey, Joseph Norman
출원인 / 주소	Ford Global Technologies, LLC
대리인 / 주소	Voutyras, Julia
인용정보	피인용 횟수 : 0 인용 특허 : 39

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Methods and systems are provided for selecting a location for water injection during a water injection event based on engine operating conditions. In one example, a method may include selecting a location for water injection from each of an intake port of each cylinder, an intake manifold upstream of all engine cylinders, and directly into each cylinder based on engine operating conditions. Further, the method may include adjusting water injection at the selected location and engine operating parameters in response the evaporated and/or condensed portion...

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1. A method for an engine having a plurality of cylinders, comprising: in response to a request for water injection, selecting, based on engine operating conditions, a location for water injection from each of: an intake port of each cylinder, an intake manifold upstream of the plurality of cylinders, and directly into each cylinder, where the selecting includes selecting to inject water at the intake manifold in response to engine load being above a threshold load, selecting to inject water at the intake port of each cylinder in response to engine load being below the threshold load, and selecting to inject water directly into each cylinder in response to engine load being above the threshold load and water injection at the intake manifold reaching an upper threshold amount; andinjecting water at the selected location via at least one water injector corresponding to the selected location. 2. The method of claim 1, wherein injecting water at the selected location further includes injecting water at the intake port of each cylinder in response to engine speed below a threshold speed. 3. The method of claim 1, further comprising operating the engine at an engine load below the threshold load and selecting to inject water at the intake port of each cylinder, wherein injecting water at the intake port of each cylinder includes injecting a same amount of water at each intake port of each cylinder, where the same amount of water is determined based on one or more of engine load, engine speed, a fuel injection amount, an indication of engine knock, spark timing, and ambient conditions. 4. The method of claim 1, further comprising operating the engine at an engine load below the threshold load and selecting to inject water at the intake port of each cylinder, wherein injecting water at the intake port of each cylinder includes injecting a different amount of water at each intake port of each cylinder, where the different amount of water injected at each intake port of each cylinder is determined based on one or more of mass air flow to each cylinder, a pressure at each cylinder, a fuel injection amount injected into each cylinder, a temperature of each cylinder, and a knock level indicated by a knock sensor coupled to each cylinder. 5. The method of claim 1, further comprising operating the engine at an engine load above the threshold load and selecting to inject water at the intake manifold only in response to operating the engine at the engine load above the threshold load and water injection at the intake manifold being below the upper threshold amount. 6. The method of claim 5, further comprising operating the engine at the engine load above the threshold load and selecting to inject water both at the intake manifold and directly into each engine cylinder in response to operating the engine at the engine load above the threshold load and water injection at the intake manifold reaching or being above the upper threshold amount. 7. The method of claim 1, wherein injecting water includes injecting an amount of water at the selected location, where the amount of water is determined after selecting the location for water injection based on the engine operating conditions, the engine operating conditions including one or more of engine load, engine speed, a fuel injection amount, an indication of engine knock, spark timing, and ambient conditions, and further comprising, after injecting the amount of water at the selected location, determining a first portion of the amount of water that vaporized and a second portion of the amount of water that remained liquid based on a change in temperature at the selected location following the injecting. 8. The method of claim 7, further comprising adjusting the amount of water injected at the selected location based on the determined first portion of the amount of water that vaporized. 9. The method of claim 7, further comprising adjusting engine operation based on the determined second portion of the amount of water that remained liquid, wherein adjusting engine operation includes adjusting one or more of spark timing, variable cam timing, exhaust gas recirculation, and fueling to the engine cylinders. 10. The method of claim 1, wherein the engine is a V-engine. 11. A method for an engine, comprising: operating the engine at a first operating condition, the first operating condition including when engine load is less than a threshold load, and receiving a first water injection request, and in response to the first water injection request received during operation at the first operating condition, injecting water via a first injector of the engine into an intake port of at least one engine cylinder;operating the engine at a second operating condition, the second operating condition including when engine load is greater than the threshold load, and receiving a second water injection request, and in response to the second water injection request received during operation at the second operating condition, injecting water via a second injector of the engine into an intake manifold upstream of a plurality of engine cylinders; andoperating the engine at a third operating condition, the third operating condition including when engine load is greater than the threshold load and water injection at the intake manifold via the second injector reaches an upper threshold amount, and receiving a third water injection request, and in response to the third water injection request being received during operation at the third operating condition, injecting water via a third injector of the engine directly into the at least one engine cylinder. 12. The method of claim 11, wherein the first operating condition further includes when engine speed is less than a threshold speed. 13. The method of claim 11, wherein injecting water via the second injector of the engine into the intake manifold includes injecting water via the second injector only. 14. The method of claim 11, wherein the second operating condition additionally includes when a knock output of one or more knock sensors coupled to the plurality of engine cylinders is greater than a threshold level. 15. The method of claim 11, wherein injecting water via the first, second, and third injectors includes injecting an amount of water, the amount of water determined based on engine operating conditions and further comprising, after injecting the amount of water, determining a first portion of the amount of water that vaporized and a second portion of the amount of water that remained liquid based on a change in temperature proximate to one of the first, second, and third injectors that injected the amount of water following the injecting. 16. The method of claim 15, further comprising adjusting the amount of water injected via the first, second, or third injector based on the determined first portion of the amount of water that vaporized and adjusting one or more additional engine operating parameters based on the determined second portion of the amount of water that remained liquid. 17. A system for an engine, comprising: a first water injector coupled to an intake manifold of the engine upstream of a plurality of engine cylinders;a first set of water injectors, each water injector of the first set coupled to an intake port of a single engine cylinder;a second set of water injectors, each water injector of the second set coupled directly to the single engine cylinder and adapted to inject water into a combustion chamber of the single engine cylinder; anda controller including non-transitory memory with computer readable instructions for:in response to a request to inject an amount of water, selecting a location to inject the amount of water from each of: the first water injector, the first set of water injectors, and the second set of water injectors, where the selection is based on engine load and water injection limits of the first water injector, the first set of water injectors, and the second set of water injectors, and where the selecting includes:selecting to inject water via the first water injector only in response to engine load being above a threshold load, selecting to inject water via each water injector of the first set of water injectors in response to engine load being below the threshold load, and selecting to inject water via each injector of the second set of water injectors in response to engine load being above the threshold load and water injection via the first injector reaching an upper threshold amount; andfollowing the selection of the location to inject the amount of water, determining the amount of water to be injected based on engine load and one or more additional engine operating conditions including engine speed, a fuel injection amount, an indication of engine knock, spark timing, and ambient conditions. 18. The system of claim 17, wherein each water injector of the first set of water injectors is angled within a corresponding intake port to face an intake valve of the single engine cylinder. 19. The system of claim 17, wherein the first water injector is positioned downstream of an intake throttle, and wherein the system further comprises an exhaust gas recirculation (EGR) passage including an EGR cooler.

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Methods and system for selecting a location for water injection in an engine

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Methods and system for selecting a location for water injection in an engine

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