Calibration system for variable capacity hydraulic pumps

Abstract

When the variable capacity control of the hydraulic pump is configured to be performed based on the pump control table representing the relationship between the pump capacity and the current command value, in order to provide high-precision calibration of the pump control table. [Solution] A calibration section (42) for calibrating a pump control table (41) includes calibration data acquisition means (48) by measuring the pump pressure corresponding to each current command value while changing the current command value in a multi-step manner to acquire the data; the first table creation means 50, by obtaining the factor K representing the relationship between the pump pressure and the pump flow rate, creates a first table (49) representing the relationship between the factor K and the pump pressure; the second table creates means (52) for creating a second table 51 representing the relationship between each current command value and the measured pump pressure; third table creation means (54) for creating a representation of the pump flow rate and current by using the factors from the first table a third table (53) of relationship between command values; and pump control table creation means (55) for creating a pump control table representing the relationship between pump capacity and current command value by using the engine speed during pump pressure measurement (41).

Description

technical field [0001] The present invention relates to a calibration system for a variable-capacity hydraulic pump whose capacity is variably controlled based on a current command value output from a controller. Background technique [0002] Generally, in a hydraulic working machine including a hydraulic excavator, a variable-capacity hydraulic pump is generally used, the capacity of which is variably controlled based on a current command value output from a controller, which is well known It is configured to install a table representing the correspondence between the pump capacity (or pump flow rate) and the current command value and output the current command value acquired from the controller by using the table. [0003] This table is prepared in advance according to the specification, and is stored in the controller that shows the correspondence between the pump capacity and the current command value. By using the table based on the specification, the current command va...

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Problems solved by technology

[0003] This table is prepared in advance according to the specification, and is stored in the controller indicating the correspondence between the pump capacity and the current command value, and the current command value is output by using the table based on the specification, but sometimes due to changes in manufacturing, changes in the service life etc. A deviation between the pump capacity value corresponding to the current command value output from the specification-based table and the actual pump capacity value occurs

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