Online sensor calibration for electrohydraulic valves
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01L-027/00
G01B-007/14
F15B-019/00
출원번호
US-0105532
(2013-12-13)
등록번호
US-9383287
(2016-07-05)
발명자
/ 주소
Rannow, Michael Berne
출원인 / 주소
Eaton Corporation
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
1인용 특허 :
10
초록▼
An online method for reconfiguring pressure and position sensors in a hydraulic system is disclosed. In one step, a sensor drift condition, a recalibration request, or an unisolated fault condition is detected. In another step, a system pressure sensor or another sensor, such as a load-sense pressur
An online method for reconfiguring pressure and position sensors in a hydraulic system is disclosed. In one step, a sensor drift condition, a recalibration request, or an unisolated fault condition is detected. In another step, a system pressure sensor or another sensor, such as a load-sense pressure sensor, is verified as a trusted master reference sensor. Another step includes measuring and recording a first pressure reading at the master reference sensor and first voltage readings associated with first, second, third, and fourth pressure slave sensors at a first pump pressure set point. Another step includes, repeating the previous step at a second pump pressure set point. A new gain and offset for each of the first, second, third, and fourth pressure sensors can be calculated based on a comparison of the recoded first and second pressure readings and the recorded first and second voltage readings.
대표청구항▼
1. An online method for reconfiguring pressure sensors in a hydraulic system comprising the steps of: (a) providing an electro-hydraulic system comprising a control system, a system pump, a system pump pressure sensor, a first valve having a first pressure sensor in fluid communication with a first
1. An online method for reconfiguring pressure sensors in a hydraulic system comprising the steps of: (a) providing an electro-hydraulic system comprising a control system, a system pump, a system pump pressure sensor, a first valve having a first pressure sensor in fluid communication with a first side of a first actuator, a second valve having a second pressure sensor in fluid communication with a second side of the first actuator, a third valve having a third pressure sensor in fluid communication with a first side of a second actuator, and a fourth valve having a fourth pressure sensor in fluid communication with the second side of the second actuator;(b) detecting at least one of a sensor drift condition, a recalibration request, and an unisolated fault condition;(c) verifying that the system pump pressure sensor or another pressure sensor can be trusted as a master reference sensor;(d) measuring and recording a first pressure reading at the master reference sensor and first voltage readings associated with the first, second, third, and fourth pressure sensors at a first pump pressure set point;(e) measuring and recording a second pressure reading at the master reference sensor and second voltage readings associated with the first, second, third, and fourth pressure sensors at a second pump pressure set point; and(f) computing a new gain and offset for each of the first, second, third, and fourth pressure sensors based on a comparison of the recorded first and second pressure readings with respect to the master reference sensor and the recorded first and second voltage readings. 2. The online method for reconfiguring pressure sensors in a hydraulic system of claim 1, wherein the step of verifying that the system pump pressure sensor or the another pressure sensor can be trusted as a master reference sensor includes: (a) setting the pump to a predetermined pressure;(b) commanding the first and third valves to open to the system pump and recording pressures sensed at the system pump pressure sensor, first, and third pressure sensors;(c) closing the first and third valves;(d) commanding the second and fourth valves to open to the system pump and recording pressures sensed at the system pump pressure sensor, second, and fourth pressure sensors; and(e) analyzing the recorded pressures against predefined condition data stored in the control system. 3. The online method for reconfiguring pressure sensors in the hydraulic system of claim 2, wherein the condition data includes fault condition data. 4. The online method for reconfiguring pressure sensors in the hydraulic system of claim 3, wherein the condition data includes calibration condition data. 5. The online method for reconfiguring pressure sensors in the hydraulic system of claim 1, where each of the pressure sensors is a strain-based pressure sensor. 6. The online method for reconfiguring pressure sensors in the hydraulic system of claim 1, wherein the first actuator is a lift cylinder and the second actuator is a tilt cylinder of a work machine. 7. A method for identifying a recalibration reference sensor in a hydraulic system comprising the steps of: (a) providing an electro-hydraulic system comprising a control system, a system pump, a system pump pressure sensor, a first valve having a first pressure sensor in fluid communication with a first side of a first actuator, a second valve having a second pressure sensor in fluid communication with a second side of the first actuator, a third valve having a third pressure sensor in fluid communication with a first side of a second actuator, and a fourth valve having a fourth pressure sensor in fluid communication with the second side of the second actuator;(b) setting the pump to a predetermined pressure;(c) commanding the first and third valves to open to the system pump and recording pressures sensed at the system pump pressure sensor, first, and third pressure sensors;(d) closing the first and third valves;(e) commanding the second and fourth valves to open to the system pump and recording pressures sensed at the system pump pressure sensor, second, and fourth pressure sensors; and(f) analyzing the recorded pressures against predefined condition data stored in the control system. 8. The method for identifying a recalibration reference sensor of claim 7, wherein the condition data includes fault condition data. 9. The method for identifying a recalibration reference sensor of claim 8, wherein the condition data includes calibration condition data. 10. The method for identifying a recalibration reference sensor of claim 7, where each of the pressure sensors is a strain-based pressure sensor. 11. The method for identifying a recalibration reference sensor of claim 7, wherein the first actuator is a lift cylinder and the second actuator is a tilt cylinder of a work machine. 12. An online method for reconfiguring pressure sensors in a hydraulic system comprising the steps of: (a) providing an electro-hydraulic system comprising a control system, a system pump, a system pump pressure sensor, and a plurality of control valves wherein each of the valves has at least one corresponding pressure sensor in fluid communication with an actuator;(b) detecting at least one of a sensor drift condition, a recalibration request, and an unisolated fault condition;(c) verifying that the system pump pressure sensor or another pressure sensor can be trusted as a master reference sensor;(d) measuring and recording a first pressure reading at the master reference sensor and first voltage readings associated with the plurality of pressure sensors at a first pump pressure set point;(e) measuring and recording a second pressure reading at the master reference sensor and second voltage readings associated with the plurality of pressure sensors at a second pump pressure set point; and(f) computing a new gain and offset for each of the plurality of pressure sensors based on a comparison of the recoded first and second pressure readings with respect to the master reference sensor and the recorded first and second voltage readings. 13. The online method for reconfiguring pressure sensors in a hydraulic system of claim 12, wherein the step of verifying that the system pump pressure sensor or the another pressure sensor can be trusted as a master reference sensor includes: (a) setting the pump to a predetermined pressure;(b) commanding the plurality of valves to open to the system pump and recording pressures sensed at the system pump pressure sensor and the pressure sensors corresponding to the plurality of valves; and(c) analyzing the recorded pressures against predefined condition data stored in the control system. 14. The online method for reconfiguring pressure sensors in a hydraulic system of claim 13, wherein the step of commanding the plurality of valves to open to the system pump and recording pressures sensed at the system pump pressure sensor and the pressure sensors corresponding to the plurality of valves is performed sequentially and repeated for at least some of the plurality of valves. 15. The online method for reconfiguring pressure sensors in a hydraulic system of claim 12, further comprising the steps of: (a) commanding the plurality of valves to move to a first end stop position and a second end stop position;(b) recording end stop voltages at each of the end stop positions for position sensors associated with the plurality of valves;(c) computing a new gain and offset for each of the plurality of position sensors based on a comparison of the recorded end stop voltages with respect to stored end stop position data; and(d) recalibrating the position sensors with the new gain and offset for each position sensor.
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이 특허에 인용된 특허 (10)
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Vermonet,Claire; Meissonnier,Guillaume; Lorret,C챕dric; Vespasien,Jean Marie, System for calibrating apparatus for acquiring the pressure in a motor vehicle diesel engine cylinder.
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