Control calibration apparatus for variable-capacity pump and method thereof

Abstract

Problem: Provide a control calibration apparatus for a variable-capacity pump that can increase the flow control accuracy of the variable-capacity pump and a method thereof. Solution: The control calibration apparatus of the variable capacitance pump includes a controller that outputs a value of current for a flow rate command of the variable-capacity pump and a flow sensor that measures a flow rate of the variable-capacity pump. The controller has a function for obtaining a quadratic function formula that is a current-to-flow characteristic for flow control of the variable-capacity pump from a first value of current when the maximum flow rate of the variable-capacity pump is measured by the flow rate sensor, a second value of current when the minimum flow rate of the variable-capacity pump is measured by the flow rate sensor, and a fixed value of current corresponding to a fixed flow rate based on the specifications of the variable-capacity pump.

1 . A control calibration apparatus of a variable-capacity pump for setting a current-to-flow characteristic for flow control of current-controlled variable-capacity pump, wherein the control calibration apparatus comprises:
 a controller for outputting a value of current of a flow rate command of the variable-capacity pump; and   a flow sensor for measuring a flow rate of the variable-capacity pump,   wherein the controller has a function for obtaining a quadratic function formula that is a current-to-flow characteristic of the variable-capacity pump for flow control from a first value of current when a maximum flow rate of the variable-capacity pump is measured by the flow sensor, a second value of current when a minimum flow rate of the variable-capacity pump is measured by the flow sensor, and a fixed value of current corresponding to a fixed flow rate based on the specifications of the variable-capacity pump.   
     
     
         2 . The control calibration apparatus of the variable-capacity pump according to  claim 1 , wherein
 the first value of current is a value of current when the flow rate sensor measures saturation of the flow rate at a time of the value of current for the flow rate command of the variable-capacity pump increasing, and   the second value of current is a value of current when the flow rate sensor measures saturation of the flow rate at a time of the value of current for the flow rate command of the variable-capacity pump falling.   
     
     
         3 . The control calibration apparatus of a variable-capacity pump according to  claim 1 , wherein
 the flow rate sensor is a flow measurement pressure sensor of the variable-capacity pump, which measures the flow rate based on the discharge flow rate of the variable-capacity pump in relation to a discharge pressure under a fixed throttle condition or a fixed rotational speed condition.   
     
     
         4 . A control calibration method of a variable-capacity pump that sets a current-to-flow characteristic for flow control of a current-controlled variable-capacity pump, including
 obtaining a quadratic function formula from a first value of current for a flow rate command when a maximum flow rate of the variable-capacity pump is measured, a second value of current for a flow rate command when a minimum flow rate of the variable-capacity pump is measured, and a fixed value of current corresponding to a fixed flow rate based on a specification of the variable-capacity pump.   
     
     
         5 . The control calibration method of a variable-capacity pump according to  claim 4 , wherein
 the first value of current is a value of current when saturation of the flow rate is measured at a time of the value of current for the flow rate command of the variable-capacity pump increasing, and   the second value of current is a value of current when the saturation of the flow rate is measured at a time of the value of current for the flow rate command of the variable-capacity pump falling.   
     
     
         6 . The control calibration method of the variable-capacity pump according to  claim 4 , wherein the flow rate of the variable-capacity pump is measured based on a discharge pressure.