IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0626970
(2009-11-30)
|
등록번호 |
US-8166795
(2012-05-01)
|
발명자
/ 주소 |
- Gehlhoff, Wade L.
- Schottler, Chris W.
- Balasubramanian, Kishore
- Fagerlund, Christian
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
10 |
초록
▼
A method for resetting a calibration of a sensor operating out-of-range in a hydraulic actuation system is provided. The hydraulic actuation system includes a pump, a reservoir, a plurality of work-ports, a plurality of sensors, and a valve system, and a controller for regulating the hydraulic actua
A method for resetting a calibration of a sensor operating out-of-range in a hydraulic actuation system is provided. The hydraulic actuation system includes a pump, a reservoir, a plurality of work-ports, a plurality of sensors, and a valve system, and a controller for regulating the hydraulic actuation system based on fluid flow demand and sensed pressures. The method includes detecting the sensor operating out-of-range, opening all work-ports to the reservoir, resetting all sensors to reservoir pressure, supplying all sensors with fluid at maximum pump pressure, and sensing the maximum pump pressure at each sensor. Additionally, the method includes determining an average pressure value across all sensors, assigning the determined average pressure value to the sensor that is operating out-of-range, and resetting the calibration of the sensor that is operating out-of-range based on the reservoir pressure and the average pressure values.
대표청구항
▼
1. A method for resetting a calibration of a sensor operating out of a prescribed range in a hydraulic actuation system, the hydraulic actuation system including: a pump arranged to supply fluid flow in response to a fluid flow demand; a reservoir arranged to hold fluid; a plurality of work-ports, s
1. A method for resetting a calibration of a sensor operating out of a prescribed range in a hydraulic actuation system, the hydraulic actuation system including: a pump arranged to supply fluid flow in response to a fluid flow demand; a reservoir arranged to hold fluid; a plurality of work-ports, such that the pump is in fluid communication with the reservoir and the plurality of work-ports; a plurality of sensors, each sensor arranged to sense pressure at a corresponding one of the plurality of work-ports; a valve system arranged to control fluid flow between the pump, the reservoir and the plurality of work-ports; and a controller arranged to regulate the pump and the valve system in response to the fluid flow demand and to the sensed pressures; the method comprising: detecting the sensor operating out of the prescribed range;relieving pressure in the hydraulic actuation system;opening all work-ports to the reservoir;sensing pressure at each sensor;resetting all the sensors to a reservoir pressure;supplying all the sensors with the fluid at a maximum pump pressure;sensing the maximum pump pressure at each of the plurality of sensors;determining an average pressure value across all sensors of the plurality of sensors whose sensed pressure is within the prescribed range of the maximum pump pressure;assigning the determined average pressure value to the sensor that is operating out of the prescribed range; andresetting the calibration of the sensor that is operating out of the prescribed range based on the reservoir pressure and the average pressure values. 2. The method according to claim 1, further comprising identifying whether the sensor operating out of the prescribed range is within a permitted error band relative to the maximum pump pressure, wherein said assigning the determined average pressure value to the sensor that is operating out of the prescribed range is accomplished if the sensor operating out of the prescribed range is within the permitted error band relative to the maximum pump pressure. 3. The method according to claim 2, further comprising generating a malfunction signal, if the sensor operating out of the prescribed range is not within the permitted error band relative to the maximum pump pressure. 4. The method according to claim 1, wherein said relieving pressure in the hydraulic actuation system is accomplished manually by an operator of the hydraulic actuation system. 5. The method according to claim 1, wherein said relieving pressure in the hydraulic actuation system is performed for a predetermined amount of time. 6. The method according to claim 1, wherein said opening all work-ports to the reservoir is performed one at a time. 7. The method according to claim 1, wherein said supplying all sensors with fluid at maximum pump pressure is performed one at a time. 8. A method for restoring desired operation of a machine controlled by a hydraulic actuation system having a sensor that is operating out of a prescribed range, the hydraulic actuation system including: a pump arranged to supply fluid flow in response to a fluid flow demand; a reservoir arranged to hold fluid; a plurality of work-ports, such that the pump is in fluid communication with the reservoir and the plurality of work-ports; a plurality of sensors, each sensor arranged to sense pressure at a corresponding one of the plurality of work-ports; a valve system arranged to control fluid flow between the pump, the reservoir and the plurality of work-ports; and a controller arranged to regulate the pump and the valve system in response to the fluid flow demand and to the sensed pressures to operate the machine; the method comprising: detecting the sensor operating out of the prescribed range;relieving pressure in the hydraulic actuation system;opening all work-ports to the reservoir;sensing pressure at each sensor;resetting all the sensors to a reservoir pressure;supplying all the sensors with the fluid at a maximum pump pressure;sensing the maximum pump pressure at each of the plurality of sensors;determining an average pressure value across all sensors of the plurality of sensors whose sensed pressure is within the prescribed range of the maximum pump pressure;assigning the determined average pressure value to the sensor that is operating out of the prescribed range; andresetting the calibration of the sensor that is operating out of the prescribed range based on the reservoir pressure and the average pressure values, such that the desired operation of the machine is restored. 9. The method according to claim 8, additionally comprising identifying whether the sensor operating out of the prescribed range is within a permitted error band relative to the maximum pump pressure, wherein said assigning the determined average pressure value to the sensor that is operating out of the prescribed range is accomplished if the sensor operating out of the prescribed range is within the permitted error band relative to the maximum pump pressure. 10. The method according to claim 9, further comprising generating a malfunction signal, if the sensor operating out of the prescribed range is not within the permitted error band relative to the maximum pump pressure. 11. The method according to claim 8, wherein said relieving pressure in the hydraulic actuation system is accomplished manually by an operator of the hydraulic actuation system. 12. The method according to claim 8, wherein said relieving pressure in the hydraulic actuation system is performed for a predetermined amount of time. 13. The method according to claim 8, wherein said opening all work-ports to the reservoir is performed one at a time. 14. The method according to claim 8, wherein said supplying all sensors with fluid at maximum pump pressure is performed one at a time. 15. A system for resetting a calibration of a sensor operating out of a prescribed range in a hydraulic actuation system, the hydraulic actuation system including: a pump arranged to supply fluid flow in response to a fluid flow demand; a reservoir arranged to hold fluid; a plurality of work-ports, such that the pump is in fluid communication with the reservoir and the plurality of work-ports; a plurality of sensors, each sensor arranged to sense pressure at a corresponding one of the plurality of work-ports; a valve system arranged to control fluid flow between the pump, the reservoir and the plurality of work-ports; and a controller arranged to regulate the pump and the valve system in response to the fluid flow demand and to the sensed pressures; the controller adapted for: detecting the sensor operating out of the prescribed range;relieving pressure in the hydraulic actuation system;opening all work-ports to the reservoir;sensing pressure at each sensor;resetting all the sensors to reservoir pressure;supplying all the sensors with fluid at maximum pump pressure;sensing the maximum pump pressure at each of the plurality of sensors;determining an average pressure value across all sensors of the plurality of sensors whose sensed pressure is within the prescribed range of the maximum pump pressure;identifying whether the sensor operating out of the prescribed range is within a permitted error band relative to the maximum pump pressure;assigning the determined average pressure value to the sensor that is operating out of the prescribed range, if the sensor operating out of the prescribed range is within the permitted error band relative to the maximum pump pressure; andresetting the calibration of the sensor that is operating out of the prescribed range based on the reservoir pressure and the average pressure values. 16. The system according to claim 15, wherein said relieving pressure in the hydraulic actuation system is accomplished manually by an operator of the hydraulic actuation system. 17. The method according to claim 15, wherein said relieving pressure in the hydraulic actuation system is performed for a predetermined amount of time. 18. The method according to claim 15, wherein said opening all work-ports to the reservoir is performed one at a time. 19. The method according to claim 15, wherein said supplying all sensors with fluid at maximum pump pressure is performed one at a time. 20. The method according to claim 15, further comprising generating a malfunction signal, if the sensor operating out of the prescribed range is not within the permitted error band relative to the maximum pump pressure.
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