Electrically controlled hydraulic valve calibration method and system
First Claim
1. A method of calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element, comprising:
- pumping hydraulic fluid from a fluid source through a first electrically controlled hydraulic valve, and through a second electrically controlled hydraulic valve to be calibrated;
actuating the second electrically controlled hydraulic valve to be calibrated to move the valve element to a position adjacent an inlet port so that the valve just opens enough to permit flow through the inlet port;
ascertaining a first current level for actuating the second electrically controlled hydraulic valve to move the valve element to the position adjacent the inlet port, and a first displacement of the valve element responsive to the first current level;
actuating the second electrically controlled hydraulic valve to move the valve element to a position permitting flow through the inlet port;
ascertaining a second current level for actuating the second electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to the position permitting flow through the inlet port;
ascertaining a first flow rate through the first electrically controlled hydraulic valve to determine a second flow rate through the second electrically controlled hydraulic valve;
correlating the determined second flow rate through the second electrically controlled hydraulic valve with a second displacement of the valve element thereof based on the known relationship between flow rate through the valve and displacement of the valve element; and
establishing a relationship between current and displacement associated with the second electrically controlled hydraulic valve based on at least the first and the second current levels and the first and the second displacements.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element is disclosed. The method includes ascertaining a first current level for actuating the electrically controlled hydraulic valve to move the valve element to a position adjacent an inlet port, and a first displacement of the valve element responsive to the first current level. The method also includes ascertaining a second current level for actuating the electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to a position permitting flow through the inlet port, and ascertaining a second displacement of the valve element responsive to the second current level. The method further includes establishing a relationship between current and displacement associated with the electrically controlled hydraulic valve.
27 Citations
20 Claims
-
1. A method of calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element, comprising:
-
pumping hydraulic fluid from a fluid source through a first electrically controlled hydraulic valve, and through a second electrically controlled hydraulic valve to be calibrated; actuating the second electrically controlled hydraulic valve to be calibrated to move the valve element to a position adjacent an inlet port so that the valve just opens enough to permit flow through the inlet port; ascertaining a first current level for actuating the second electrically controlled hydraulic valve to move the valve element to the position adjacent the inlet port, and a first displacement of the valve element responsive to the first current level; actuating the second electrically controlled hydraulic valve to move the valve element to a position permitting flow through the inlet port; ascertaining a second current level for actuating the second electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to the position permitting flow through the inlet port; ascertaining a first flow rate through the first electrically controlled hydraulic valve to determine a second flow rate through the second electrically controlled hydraulic valve; correlating the determined second flow rate through the second electrically controlled hydraulic valve with a second displacement of the valve element thereof based on the known relationship between flow rate through the valve and displacement of the valve element; and establishing a relationship between current and displacement associated with the second electrically controlled hydraulic valve based on at least the first and the second current levels and the first and the second displacements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system for calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element, comprising:
-
a first and a second electrically controlled hydraulic valve disposed in parallel with each other, wherein the second electrically controlled hydraulic valve is to be calibrated; a hydraulic fluid pump configured to pump hydraulic fluid from a fluid source through the first and second electrically controlled hydraulic valves; and a controller configured to; actuate the second electrically controlled hydraulic valve to be calibrated to move the valve element to a position adjacent the inlet port so that the valve just opens enough to permit flow through the inlet port; actuate the second electrically controlled hydraulic valve to move the valve element to a position permitting flow through the inlet port; ascertain a first current level for actuating the second electrically controlled hydraulic valve to move the valve element to the position adjacent the inlet port, and a first displacement of the valve element responsive to the first current level; ascertain a second current level for actuating the second electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to the position permitting flow through the inlet port; ascertain a first flow rate through the first electrically controlled hydraulic valve to determine a second flow rate through the second electrically controlled hydraulic valve; correlate the determined second flow rate through the second electrically controlled hydraulic valve with a second displacement of the valve element thereof based on the known relationship between flow rate through the valve and displacement of the valve element; and establish a relationship between current and displacement associated with the second electrically controlled hydraulic valve based on at least the first and the second current levels, and the first and the second displacements. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A machine, comprising:
-
an engine; a hydraulic system; an implement system; and a system for calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element, the system including; a first electrically controlled hydraulic valve having a known correlation between current and flow rate; a second electrically controlled hydraulic to be calibrated and disposed in parallel with the first electrically controlled hydraulic valve; a hydraulic fluid pump configured to pump hydraulic fluid from a fluid source through the first and second electrically controlled hydraulic valve; and a controller configured to; actuate the second electrically controlled hydraulic valve to move the valve element to a position adjacent the inlet port so that the valve just opens enough to permit flow through the inlet port; actuate the second electrically controlled hydraulic valve to move the valve element to a position permitting flow through the inlet port; ascertain a first current level for actuating the second electrically controlled hydraulic valve to move the valve element to the position adjacent the inlet port; ascertain a first displacement of the valve element of the second electrically controlled hydraulic valve in response to the first current level; ascertain a second current level for actuating the second electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to the position permitting flow through the inlet port; ascertain a first flow rate through the first electrically controlled hydraulic valve; determine a second flow rate through the second electrically controlled hydraulic valve; correlate the determined second flow rate through the second electrically controlled hydraulic valve with a second displacement of the valve element thereof based on the known relationship between flow rate through the valve and displacement of the valve element; and establish a relationship between current and displacement associated with the second electrically controlled hydraulic valve based on at least one of the first and the second current levels, and the first and the second displacements. - View Dependent Claims (20)
-
Specification