[특허]Moisture sensing electronic irrigation control

Moisture sensing electronic irrigation control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B05B-012/12 A01G-025/16
출원번호	US-0651740 (1996-05-22)
발명자 / 주소	Lattery Jerome E.
출원인 / 주소	Parker Lore
인용정보	피인용 횟수 : 48 인용 특허 : 0

초록 ▼

An apparatus for soil irrigation control comprising a control unit, a soil probe, and a temperature probe. The function of the invention is to provide day-to-day soil moisture measurement and control of the irrigation system it is attached to, usually a timer operated system. During operation, the control circuitry periodically measures the apparent electrical resistance between the two electrodes of the soil probe. A signal related to the measured resistance is then compared to a reference set by the user and functions to close or open an electrical switch that ultimately controls the application of irrigation water. The apparatus has a temperature sensor to compensate for effects upon the moisture sensor due to changes in soil temperature, and to also suspend irrigation when freezing conditions are pending. The apparatus also detects the presence of a external timer signal and sustains irrigation through completion of the timer cycle even though the moisture sensor may become wetted during the cycle. The apparatus is capable of a wide range of adjustment to accommodate soils having vastly different characteristics and moisture content, attained by having a novel logarithmic current pulse generator.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for comparing the amount of moisture in soil with a reference setting and controlling the application of irrigation water, comprising:an electronic means for generating periodic electrical current pulses that pass through the soil between two conductive electrodes fixed upon a nonconductive support and disposed beneath the surface of the soil, said electrical current being in the form of a unipolar pulse of the briefest practical duration followed immediately by a unipolar pulse of the same duration and current amplitude having opposite polarity,an electronic comparator means that compares the voltage potential difference produced by said electrical current pulses between said conductive electrodes with a voltage potential expressing a reference setting,an electronic sensor means for measuring temperature of the air or soil and applying a correction to said voltage potential that expresses said reference setting, equal to the effect from change with temperature of the apparent electrical resistance in the soil medium,an electronic switching means that completes an electrical circuit for electrically controlled irrigation valves when the voltage potential difference produced by said electrical current between said conductive electrodes exceeds said voltage potential expressing the reference setting,and an electronic means that detects the presence of an external control signal and that causes cessation of said periodic electrical current pulses during the presence of said external control signal.

이 특허를 인용한 특허 (48)

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Hitt, Dale K.; Heaton, Kurtis G., Irrigation zone time control.
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Bowers,John R.; Bowers,John W., Moisture sensor sprinkler control systems.
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Parsons, Natan E.; Guler, Fatih; Herbert, Kay; Mo, Xiaoxiong; Wu, Haiou; Zhang, Yue, Passive sensors for automatic faucets and bathroom flushers.
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Parsons, Natan E.; Guler, Fatih; Herbert, Kay; Mo, Xiaoxiong; Wu, Haiou; Zhang, Yue, Passive sensors for automatic faucets and bathroom flushers.
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Parsons,Natan E.; Guler,Fatih; Herbert,Kay; Mo,Xiaoxiong; Wu,Haiou; Zhang,Yue, Passive sensors for automatic faucets and bathroom flushers.
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Goldberg, Leonard; Romano, James P.; Feketa, John J., Plant watering system.
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Slater, John M.; Svoboda, John M., Real-time data acquisition and telemetry based irrigation control system.
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Harrington, Jeffrey M; Koebler, Martin; Kozar, Norbert; Caamano, Ramon A; Lee, Michael J, Remote control for hose operation.
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Tracey, James B. A.; Burke, Jr., James E.; Prosise, Roy Paul; Okonsky, Christian, Remote control for valve and hose reel system.
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Hasegawa, Hiroyuki; Yamaoka, Tomonori; Ishihara, Yoshio; Masusaki, Hiroshi, Semiconductor manufacturing method and semiconductor manufacturing apparatus.
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Richings, Sr., Jon; Martin, Scott, Soil moisture probe and system with temperature adjustment.
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Runge, Thomas H.; Hill, Jason Lester; Zimmerman, James, Soil moisture sensor.
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Dresselhaus, Daniel D.; O'Brien, Kevin G., Soil moisture sensor and controller.
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Dresselhaus, Daniel D.; O'Brien, Kevin G., Soil moisture sensor and controller.
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Hughes,William C., Soil probe device and method of making same.
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Graham,Glen Gary, Systems and methods for adaptation to wireless remote control of irrigation valves from existing hardwired control devices.
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Anderson, Scott K., Two-conductor moisture activated switch.
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Ensworth, Mark M.; Booth, Barbara E.; Thornton, Dean C.; Fern, David G.; Hern, Randall A.; Napier, Malcolm N., Wireless extension to an irrigation control system and related methods.
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Ensworth, Mark M.; Booth, Barbara E.; Thornton, Dean C.; Fern, David G.; Hern, Randall A.; Napier, Malcolm N., Wireless extension to an irrigation control system and related methods.
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Ensworth, Mark M.; Booth, Barbara E.; Thornton, Dean C.; Hern, Randall A.; Napier, Malcolm N., Wireless extension to an irrigation control system and related methods.
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Thornton, Dean C.; Hern, Randall A.; Napier, Malcolm N., Wireless extension to an irrigation control system and related methods.
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Ensworth, Mark M.; Booth, Barbara E.; Thornton, Dean C.; Hern, Randall A.; Napier, Malcolm N., Wireless irrigation control.
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Ensworth, Mark M.; Booth, Barbara E.; Thornton, Dean C.; Hern, Randall A.; Napier, Malcolm N., Wireless irrigation control.
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Thornton, Dean C.; Hern, Randall A.; Napier, Malcolm N., Wireless irrigation control.
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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

내보내기 구분	파일저장 인쇄 메일전송
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Moisture sensing electronic irrigation control 원문보기

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Moisture sensing electronic irrigation control 원문보기

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