System and method of controlling torque of plural variable displacement hydraulic pumps

Abstract

A system and method of controlling torque of plural variable displacement hydraulic pumps in construction equipment are provided, which can control torque of the variable displacement hydraulic pumps so that the total amount of torque of the hydraulic pumps does not exceed the preset amount of torque by presetting the torque so that the engine does not stop even at maximum load of the hydraulic pumps or by presetting the speed of the engine or the used torque of the hydraulic pumps in consideration of the fuel economy or working speed. The system includes an engine, at least two variable displacement hydraulic pumps, hydraulic actuators, control levers generating manipulation signals, control lever sensing means detecting the manipulation amounts of the control levers, hydraulic pump pressure sensing means detecting load pressures of the hydraulic pumps, maximum torque setting means setting the total torque inputted to the hydraulic pumps, desired flow rate computing means computing flow rates of the hydraulic pumps, expected torque computing means computing expected torque values of the hydraulic pumps, torque distributing means distributing torque values of the hydraulic pumps, limited flow rate computing means computing the flow rates of the hydraulic pumps, and output means outputting control signals to regulators.

Description

[0001] Cross References to Related Applications [0002] This application is based on, and claims priority from, Korean Patent Application No. 10-2008-0052098 filed with the Korean Intellectual Property Office on June 3, 2008, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] This application relates to systems and methods for controlling the torque of a plural variable displacement pump in construction equipment that drives work implements by operating the engine and the plural variable displacement hydraulic pump associated with the engine such that the load pressure or hydraulic It is possible to use all set amounts of torque for the number of pumps. [0004] More specifically, the present invention relates to a system and method for controlling the torque of a multivariable hydraulic pump in construction equipment operating the multivariable hydraulic pump by an engine, by preset torque in consideration of fuel economy or...

AI Technical Summary

Problems solved by technology

[0012] In addition, there may be failures in torque matching due to engine or pump age (year elapse)

That is, in the event of an emergency load on the engine, the engine may stop momentarily, or the engine speed may be reduced so excessively that the output horsepower (hp) of the pump is reduced

Also, even at a standstill, failures may occur in torque matching, and in this case, an excessive reduction in engine revolutions may continue to occur

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