[특허]Electro-hydraulic controller

Electro-hydraulic controller 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16H-039/46
출원번호	US-0909138 (1978-05-24)
발명자 / 주소	Cornell Charles R. (Battle Creek MI)
출원인 / 주소	Eaton Corporation (Cleveland OH 02)
인용정보	피인용 횟수 : 25 인용 특허 : 0

초록 ▼

An electro-hydraulic control for a hydrostatic transmission including a variable displacement hydraulic pump, a fixed displacement hydraulic motor, and fluid operable strokers to vary the displacement of the pump. The electro-hydraulic control is in series between the charge pump and the standard manual controller and determines the pressure of the charge fluid ported to the standard controller. The electro-hydraulic control includes a spool biased toward a first position to port fluid from the charge pump to the standard controller, and biased toward a second position to relieve to tank the pressure of fluid ported to the manual controller. The biasing toward the second direction is accomplished, in part, by pressure in a fluid chamber exerting a biasing force on the spool, the fluid chamber being in communication with drain through a variable orifice which is variable in response to a pressure command signal. This signal is generated by control logic including a horsepower command signal generator which is variable to correspond to a maximum desired input horsepower, and circuitry providing a horsepower approximation signal representing the product of motor output speed and the instantaneous pressure command signal. The circuitry compares the horsepower command and horsepower approximation signals and generates a new pressure command signal tending to minimize the difference between the horsepower command and approximation signals. As a result, the commanded maximum system pressure varies, such that the product of maximum system pressure and motor output speed (proportional to pump flow) is constant, for a given input horsepower setting.

대표청구항 ▼

A control system for a hydrostatic transmission including a fluid pump and a fluid motor, said fluid pump having fluid operable means for varying the displacement thereof, and a source of pressurized fluid for operating the fluid operable means, said control system comprising: (a) a housing defining a valve bore, an inlet fluid port adapted for series fluid communication with the source of pressurized fluid, a control fluid port adapted for series fluid communication with the fluid operable means, and a drain fluid port adapted for communication with a fluid drian, said ports being in fluid communication with said valve bore; (b) valve means disposed in said valve bore and movable between a first position permitting fluid communication between said inlet fluid port and said control fluid port and a second position; (c) first means for biasing said valve means toward said first position; (d) second means for biasing said valve means toward said second position; (e) one of said first and second biasing means including: (1) means for generating a variable electrical command signal P; and (2) means responsive to said variable electrical command signal P to provide a variable biasing force, biasing said valve means toward said respective position, said variable biasing force being related to said variable electrical command signal P in a known manner; (f) said means for generating said command signal P including: (1) input command signal generator means which is variable to correspond to a maximum deSired input to the transmission; (2) means providing an electrical signal Nm representative of the output speed of the fluid motor, said maximum desired input being proportional to the product of P and Nm; (3) means providing an electrical input approximation signal representative of the product of the speed Nm of the fluid motor and the instantaneous command signal P; and (4) means for comparing said input command signal and said input approximation signal and generating a new command signal P tending to minimize the difference between said input command signal and said input approximation signal.

이 특허를 인용한 특허 (25)

Hawkins Royal R. (Bloomington MN), Anti-stall control.
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Iino Takashi (Saitama JPX) Katagiri Yoshihiro (Saitama JPX), Apparatus for controlling continuously variable automotive transmission.
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Pylat ; Jr. John A. (2378 Topaz Dr. Troy MI 48098), Automatic adjusting deceleration control for a hydrostatically powered device.
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Cornell Charles R. (Naperville IL) Olson David J. (Naperville IL), Automatic power control for variable power train.
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Yamaguchi Kouji (Saitama JPX) Maki Kazuya (Aichi JPX), Control apparatus for hydraulic continuously variable speed transmission.
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Kobayashi Akio (Saitama JPX) Tanaka Hiroshi (Saitama JPX) Yamashita Shoji (Saitama JPX) Fujita Yasumasa (Tokyo JPX) Hikichi Koichi (Tokyo JPX) Kumagai Chiaki (Saitama JPX), Controlling device for non-stage transmission for vehicles.
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Tordenmalm L. sten (S:a Sandby SEX), Devices for limiting the power output of a hydraulic assembly.
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Reynolds Richard W. (Ames IA) Myers Allen (Ames IA) Foley Daniel J. (Westminster MA), Electronic constant speed control for a hydrostatic transmission.
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Westveer Robert C. (Kalamazoo MI) Vandervoort John K. (Richland MI), Electronic control system for a variable displacement pump.
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Vahabzadeh Hamid ; Bucknor Norman Kenneth, Hydraulic control for a continuously variable transmission.
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Akihito Okuda JP; Shigeru Morimoto JP; Koichi Fushimi JP, Hydraulic controller for variable capacity hydraulic transmission.
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Furumoto Mitsumasa (Saitama JPX) Kawahara Eiichiro (Saitama JPX) Ikejiri Kenichi (Saitama JPX) Yamamoto Noboru (Saitama JPX), Hydraulically operated continuously variable transmission.
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Furumoto Mitsumasa (Saitama JPX) Kawahara Eiichiro (Saitama JPX) Koyama Takashi (Tokyo JPX), Hydraulically operated continuously variable transmission.
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Mayr Albert (Senden DEX) Wiest Wolfgang (Tiefenbach DEX), Hydrostatic transmission having a control and regulating device for adjusting the driving torque with superimposed outpu.
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Ross William A. (Excelsior MN) Arlt Randal E. (Eden Prairie MN), Hydrostatic transmission system and power limiter control therefor.
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Backe Bengt S. (Dundee IL) Durham La Moyne W. (Bartlet IL), Method and apparatus for controlling hydraulic systems.
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DeMarco, Frank Anthony; Cronin, Michael G., Method and system for feedback pressure control.
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Iino Takashi (Saitama JPX) Maki Kazuya (Saitama JPX), Method of controlling continuously variable automotive transmission.
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Hamey, Peter M.; Ineson, John, Open-loop hydraulic supply system.
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Schottler Joseph Julius ; Hall C. Kells, Speed sensing device.
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Cornell Charles R. (Naperville IL) Olson David J. (Naperville IL), Synchronized mid-mounted clutch for variable power train.
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Akiyama Teruo (Yokohama JPX) Sasaki Katsuyuki (Kyoto JPX) Saigo Takaichi (Chigasaki JPX), Torque regulating system for fluid operated pump displacement control systems.
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Tsai Shan-chin (Rockford IL), Torque-velocity control for variable displacement hydraulic motor.
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Cornell Charles R. (Naperville IL), Transmission monitor/control microprocessor for continuously variable power train.
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Krieger Daniel J. ; Wetzel Michael D., Variable pilot pressure control for pilot valves.
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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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Electro-hydraulic controller 원문보기

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