[특허]Hydraulically-actuated electronically-controlled unit injector having stroke-controlled piston and methods of operation

Hydraulically-actuated electronically-controlled unit injector having stroke-controlled piston and methods of operation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02M-047/00
출원번호	US-0776502 (1991-10-11)
발명자 / 주소	Ausman Thomas G. (Peoria IL) Longman Douglas E. (Naperville IL) Stockner Alan R. (Metamora IL)
출원인 / 주소	Caterpillar, Inc. (Peoria IL 02)
인용정보	피인용 횟수 : 40 인용 특허 : 0

초록 ▼

In a hydraulically-actuated electronically-controlled unit injector, the viscosity of the actuating fluid used to actuate the unit injector varies with ambient temperature and affects the magnitude of pressure drops in the actuating fluid circuit. Such variations in viscosity affect the magnitude of the fuel delivery command pulsewidth and/or actuating fluid pressure required for engine startup versus that required for normal engine operation. The present invention provides an improved hydraulically-actuated electronically-controlled unit injector and methods of operation which compensate for variations in the viscosity of the actuating fluid used to hydraulically actuate a piston. The stroke of the piston is controlled electronically and/or mechanically in order to achieve an appropriate amount of fuel injection.

대표청구항 ▼

A method of operating a hydraulically-actuated electronically-controlled unit injector adapted for starting an engine comprising the steps of: applying an electrical fuel delivery command signal of a selected first pulsewidth to an electrically-actuated valve of the unit injector to open the valve during the first pulsewidth; supplying pressurized actuating fluid to the unit injector in response to the valve being opened during the first pulsewidth; hydraulically displacing a piston of the unit injector over a first displacement to effect a first fuel injection quantity in response to the pressurized actuating fluid being supplied to the unit injector during the first pulsewidth; discontinuing the electrical fuel delivery command signal of the selected first pulsewidth to close the valve and end the first fuel injection quantity; applying another electrical fuel delivery command signal of a selected second pulsewidth to the electrically-actuated valve of the unit injector after the engine is started to open the valve during the second pulsewidth, said second pulsewidth being less than the first pulsewidth; supplying pressurized actuating fluid to the unit injector in response to the valve being opened during the second pulsewidth; hydraulically displacing the piston of the unit injector over a second displacement to effect a second fuel injection quantity in response to the pressurized actuating fluid being supplied to the unit injector during the second pulsewidth; and discontinuing the electrical fuel delivery command signal of the selected second pulsewidth to close the valve and and the second fuel injection quantity. The method of claim 1 wherein the second displacement of the piston is less than the first displacement, said second fuel injection quantity being less than the first fuel injection quantity.

이 특허를 인용한 특허 (40)

Sturman Oded E., Air-fuel module adapted for an internal combustion engine.
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Sturman Oded E., Air-fuel module adapted for an internal combustion engine.
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Carrell Darwin R. ; Ruedin Joshua C., Apparatus and method for determining start of injection of a fuel injector.
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Iwaszkiewicz Titus J. ; Rodgers David V., Commanded, rail-pressure-based, variable injector boost current duration.
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Barnes Travis E. ; Lukich Michael S., Device for controlling fuel injection in cold engine temperatures.
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Barnes Travis E. ; Lukich Michael S. ; McGee Brian G. ; Timmons John P., Electronic control and method for consistently controlling the amount of fuel injected by a hydraulically activated, electronically controlled injector fuel system to an engine.
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Cowden Gary L. ; Davis Errol W. ; McGee Brian G. ; Puckett Daniel R. ; Schulman Matthew E. ; Timmons John P., Electronic control for a hydraulically activated, electronically controlled injector fuel system and method for operating same.
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Cowden Gary L. ; McGee Brian G. ; Puckett Daniel R. ; Timmons John P., Electronic control for a hydraulically activated, electronically controlled injector fuel system and method for operating same.
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Saiki Suzuhiro,JPX ; Uchiyama Tadashi,JPX, Electronic fuel injection apparatus for diesel engine.
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Stockner Alan R. ; Rodier William J., Electronic fuel injection quiet operation.
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Nemoto Hideki,JPX ; Uchiyama Tadashi,JPX ; Kakihara Tomoaki,JPX, Electronically controlled hydraulic actuation type fuel injection device utilizing oil viscosity detection device and me.
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Saiki Suzuhiro,JPX, Engine operation control device.
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Suzuhiro Saiki JP, Engine operation control device.
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Puckett, Daniel Reese, Fuel injection control system and method.
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David Y. Chang ; David C. Mack, Fuel injection system and a method for operating.
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Lei Ning ; Yang Xilin, Fuel injector.
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Nemoto Hideki,JPX ; Kakihara Tomoaki,JPX ; Uchiyama Tadashi,JPX, Fuel injector for internal combustion engines.
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Lei, Ning, Fuel injector with direct needle valve control.
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Lei, Ning, Fuel injector with dual control valve.
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Minagawa Kazuji,JPX ; Oi Kiyotoshi,JPX ; Arai Katsumi,JPX, Fuel supply apparatus for an internal combustion engine.
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Henig Yitshak I.,GBX ; Holtman Richard H., Fuel system having priming actuating fluid accumulator.
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Sturman Oded E., High speed fuel injector.
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Sturman Oded E., Hydraulically driven springless fuel injector.
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Lei Ning, Injector with variable needle valve opening pressure.
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Sturman Oded E., Intensified fuel injector having a lateral drain passage.
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Carrell Darwin R. ; Kendrick Larry E. ; Lukich Michael S. ; Shively Kirk S., Method and apparatus for determining a viscosity of an actuating fluid.
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Darwin R. Carrell ; Larry E. Kendrick ; Gregory J. Speckhart ; Michael S. Lukich, Method and apparatus for determining an oil grade of an actuating fluid.
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Barnes Travis E. ; Lukich Michael S. ; McGee Brian G. ; Puckett Daniel R. ; Timmons John P., Method for controlled transition between use of different injection waveform types in a hydraulically-actuated electronically-controlled fuel injection system.
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McGee Brian G. ; Timmons John P., Method for delivering a small quantity of fuel with a hydraulically-actuated injector during split injection.
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Hubrich, Stefan; Pulvermueller, Michael, Method for determining the viscosity of an operating liquid of an internal combustion engine.
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Barnes Travis E. (Peoria IL), Method of correcting engine maps based on engine temperature.
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Travis E. Barnes ; Brian E. Uhlenhake, Method of determining the fuel injection timing for an internal combustion engine.
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Breeden,Robert H.; Sheppard,Peter H.; Sterrett,Mark A., Pump assembly and method.
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Breeden, Robert H., Pump assembly, valve and method.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Hydraulically-actuated electronically-controlled unit injector having stroke-controlled piston and methods of operation 원문보기

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Hydraulically-actuated electronically-controlled unit injector having stroke-controlled piston and methods of operation 원문보기

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