Fuel injector with piezoelectric actuator preload
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-051/06
B05B-003/00
F02M-047/02
출원번호
US-0167556
(2005-06-28)
발명자
/ 주소
Rauznitz,Peter
Buchanan,David L.
Peters,Lester L.
출원인 / 주소
Cummins Inc.
대리인 / 주소
Nixon Peabody LLP
인용정보
피인용 횟수 :
39인용 특허 :
16
초록▼
An piezoelectric actuated injector is provided which includes a nozzle valve element, a control volume, and an injection control valve including a control valve member for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a prel
An piezoelectric actuated injector is provided which includes a nozzle valve element, a control volume, and an injection control valve including a control valve member for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a preload chamber positioned along an injection control valve member for receiving high pressure fuel. The high pressure fuel acts on the injection control valve member to apply a preload force to supply a preload force to the stack of piezoelectric elements thereby ensuring more accurate control over fuel injection timing and metering.
대표청구항▼
We claim: 1. A method for providing preload to a piezoelectric actuator of a fuel injector during operation of the injector, comprising: providing a fuel injector including a nozzle valve element movable between an open position permitting fuel flow and a closed position blocking fuel flow, a contr
We claim: 1. A method for providing preload to a piezoelectric actuator of a fuel injector during operation of the injector, comprising: providing a fuel injector including a nozzle valve element movable between an open position permitting fuel flow and a closed position blocking fuel flow, a control volume positioned to receive a pressurized supply of fuel, a drain circuit for draining fuel from said control volume to a low pressure drain, an injection control valve including a control valve member positioned along said drain circuit to control fuel flow from said control volume, a piezoelectric actuator including a stack of piezoelectric elements movable between expanded and contracted positions, and a preload chamber positioned a spaced axial distance from said control volume between said control volume and said piezoelectric actuator to receive high pressure fluid; and supplying high pressure fluid of at least approximately 200 bar to said preload chamber to generate a high fluid pressure preload force on said stack of piezoelectric elements. 2. A fuel injector for injecting fuel at high pressure into the combustion chamber of an engine, comprising: an injector body containing an injector cavity and an injector orifice communicating with one end of said injector cavity to discharge fuel into the combustion chamber; a nozzle valve element positioned in one end of said injector cavity adjacent said injector orifice, said nozzle valve element movable between an open position in which fuel may flow through said injector orifice into the combustion chamber and a closed position in which fuel flow through said injector orifice is blocked; a control volume positioned to receive a pressurized supply of fuel; a drain circuit for draining fuel from said control volume to a low pressure drain; an injection control valve positioned along said drain circuit to control fuel flow from said control volume, said injection control valve including a piezoelectric actuator including a stack of piezoelectric elements movable between expanded and contracted positions and a control valve member movable between an open position permitting flow through said drain circuit and a closed position blocking flow through said drain circuit; a preload chamber positioned a spaced axial distance from said control volume between said control volume and said piezoelectric actuator to receive high pressure fluid; a supply of high pressure fluid connected to said preload chamber, wherein the high pressure fluid in said preload chamber generates a high fluid pressure preload force on said stack of piezoelectric elements; and a check valve movable between a closed position to prevent the flow of high pressure fluid from said preload chamber and an open position permitting the flow of high pressure fluid into the preload chamber. 3. The injector of claim 2, wherein said supply of high pressure fluid supplies high pressure fuel, used for supplying fuel for injection into the combustion chamber of the engine, at a pressure of at least approximately 200 bar. 4. The injector of claim 2, wherein said supply of high pressure fluid includes a high pressure preload supply circuit including an axial passage extending through said control valve member. 5. The injector of claim 2, wherein said injection control valve member is pressure balanced. 6. The injector of claim 2, wherein said check valve includes a valve element and a bias spring for biasing said valve element toward said closed position. 7. The injector of claim 6, wherein said preload chamber is formed at least partially in one end of said first member, said bias spring and said valve element being at least partially positioned in said preload chamber. 8. The injector of claim 2, wherein said control valve member includes a first member and a second member positioned in axial alignment with said first member, said preload chamber positioned between said first and said second members. 9. The injector of claim 8, wherein said preload chamber is formed at least partially in one end of said first member. 10. The injector of claim 8, wherein said preload chamber is formed at least partially in one end of said second member. 11. A fuel injector for injecting fuel at high pressure into the combustion chamber of an engine, comprising: an injector body containing an injector cavity and an injector orifice communicating with one end of said injector cavity to discharge fuel into the combustion chamber; a nozzle valve element positioned in one end of said injector cavity adjacent said injector orifice, said nozzle valve element movable between an open position in which fuel may flow through said injector orifice into the combustion chamber and a closed position in which fuel flow through said injector orifice is blocked; a control volume positioned to receive a pressurized supply of fuel; a drain circuit for draining fuel from said control volume to a low pressure drain; an injection control valve positioned along said drain circuit to control fuel flow from said control volume, said injection control valve including a piezoelectric actuator including a stack of piezoelectric elements movable between expanded and contracted positions and a control valve member movable between an open position permitting flow through said drain circuit and a closed position blocking flow through said drain circuit; a preload chamber positioned a spaced axial distance from said control volume between said control volume and said piezoelectric actuator to receive high pressure fluid; and a supply of high pressure fluid connected to said preload chamber to supply fluid at a pressure of at least approximately 200 bar, wherein the high pressure fluid in said preload chamber generates a high fluid pressure preload force on said stack of piezoelectric elements. 12. The injector of claim 11, wherein said supply of high pressure fluid is a supply of high pressure fuel used for supplying fuel for injection into the combustion chamber of the engine. 13. The injector of claim 11, further including a check valve movable between a closed position to prevent the flow of high pressure fluid from said preload chamber and an open position permitting the flow of high pressure fluid into the preload chamber. 14. The injector of claim 11, wherein said supply of high pressure fluid includes a high pressure preload supply circuit including an axial passage extending through said control valve member. 15. The injector of claim 11, wherein said injection control valve member is pressure balanced. 16. The injector of claim 11, wherein said check valve includes a valve element and a bias spring for biasing said valve element toward said closed position. 17. The injector of claim 16, wherein said preload chamber is formed at least partially in one end of said first member, said bias spring and said valve element being at least partially positioned in said preload chamber. 18. The injector of claim 11, wherein said control valve member includes a first member and a second member positioned in axial alignment with said first member, said preload chamber positioned between said first and said second members. 19. The injector of claim 18, wherein said preload chamber is formed at least partially in one end of said first member. 20. The injector of claim 18, wherein said preload chamber is formed at least partially in one end of said second member.
Martin Tiby M. (3836 Holly La. Waterloo IA 50702), High pressure electronic common rail fuel injector and method of controlling a fuel injection event.
Rauznitz, Peter; Peters, Lester L.; Crofts, John D.; Meyer, William D., Piezoelectric fuel injection system with rate shape control and method of controlling same.
Manubolu, Avinash R.; Lewis, Stephen R.; Lakhapati, Shriprasad G.; Xu, Zhenlong, Fuel injector having integral body guide and nozzle case for pressure containment.
McAlister, Roy Edward; Larsen, Melvin James, Integrated fuel injector igniters configured to inject multiple fuels and/or coolants and associated methods of use and manufacture.
McAlister, Roy E., Integrated fuel injector igniters having force generating assemblies for injecting and igniting fuel and associated methods of use and manufacture.
McAlister, Roy E., Integrated fuel injector igniters having force generating assemblies for injecting and igniting fuel and associated methods of use and manufacture.
McAlister, Roy Edward, Integrated fuel injector igniters having force generating assemblies for injecting and igniting fuel and associated methods of use and manufacture.
McAlister, Roy Edward; Larsen, Melvin James; McAlister, legal representative, Roy Edward, Methods and systems for adaptively cooling combustion chambers in engines.
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