US 5,527,156 AGranted

Apparatus for and method of controlling engine and pumps of hydraulic construction equipment

AssigneeSamsung Heavy Industry Co., Ltd.

InventorMyung-Hoon Song

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Abstract

An apparatus for and a method of controlling the engine and pumps of hydraulic construction equipment capable of achieving automation of the hydraulic construction equipment by controlling the oil quantity fed to solenoid controlled proportional valves such that it is proportional to the manipulation amount of a manipulation command unit through a computation performed by a controller on the basis of engine RPM data from an engine RPM detection unit and pump delivery pressure variation data from a pump delivery pressure detection units so that the suction horse power of each of the pumps corresponds to the maximum output horse power of the engine and by controlling the oil quantity fed to the hydraulic cylinders 105a and 105b by oil quantity control valves such that it corresponds to the manipulation amount and manipulation ratio from the manipulation command unit.

Claims5

Dependent claims

In a hydraulic construction equipment including an engine as a power source, at least one variable displacement type hydraulic pump driven by the engine, at least one actuator for actuating a corresponding work implement, a solenoid controlled proportional oil quantity control valve disposed in an oil line connected between the hydraulic pump and the actuator and adapted to switch a connection of the oil line in accordance with a predetermined input signal and adjust an output oil quantity to be proportional to the input signal, and a solenoid controlled proportional valve adapted to adjust a delivery oil quantity of the hydraulic pump in accordance with a predetermined input signal, an apparatus for controlling the engine and the hydraulic pump, comprising:

work implement manipulation command means adapted to receive a manipulation command signal for the working member generated by a driver;
engine RPM detection means adapted to detect an RPM of the engine;
pump delivery oil quantity detection means adapted to detect a delivery oil quantity of the hydraulic pump;
pump delivery pressure detection means adapted to detect a delivery pressure of the hydraulic pump;
and
control means adapted to control the solenoid controlled proportional valve on the basis of engine RPM data from the engine RPM detection means and pump delivery pressure variation data from the pump delivery pressure detection means such that a suction horse power of the hydraulic pump corresponds to a maximum output horse power of the engine and to control the oil quantity control valve such that a oil quantity to be fed to the actuator corresponds to a manipulation amount and a manipulation ratio based on the manipulation command signal from the manipulation command means.

3 more elements

A method for controlling engine and pump operations in a hydraulic construction equipment including an engine as a power source, at least one variable displacement type hydraulic pump driven by the engine, at least one actuator for actuating a corresponding work implement, a solenoid controlled proportional oil quantity control valve disposed in an oil line connected between the hydraulic pump and the actuator and adapted to switch a connection of the oil line in accordance with a predetermined input signal and adjust an output oil quantity to be proportional to the input signal, a solenoid controlled proportional valve adapted to adjust a delivery oil quantity of the hydraulic pump in accordance with a predetermined input signal, work implement manipulation command means adapted to receive a manipulation command signal for the work implement generated by a driver, engine RPM detection means adapted to detect an RPM of the engine, pump delivery oil quantity detection means adapted to detect a delivery oil quantity of the hydraulic pump, and pump delivery pressure detection means adapted to detect a delivery pressure of the hydraulic pump, comprising the step of:

controlling the solenoid controlled proportional valve on the basis of engine RPM data from the engine RPM detection means and pump delivery pressure variation data from the pump delivery pressure detection means such that a suction horse power of the hydraulic pump corresponds to a maximum output horse power of the engine and controlling the oil quantity control valve such that an oil quantity to be fed to the actuator corresponds to a manipulation amount and a manipulation ratio based on the manipulation command signal from the manipulation command means.

Dependencies are inferred from the claim text.