Controller of hybrid construction machine

Abstract

Disclosed is a controller of a hybrid construction machine wherein energy discharged from a boom cylinder (BC) is utilized efficiently. A controller (C) is provided with a function for judging the operating direction and the controlled variable of an operation valve (14) for a boom by receiving the output signal from a sensor (14a) provided in the operation valve (14) for a boom, and a function for controlling the opening of a proportional solenoid valve (34) according to the operating direction and the controlled variable and controlling the tilt angles of a sub-pump (SP) and an assist motor (AM) through tilt angle controllers (35, 36), wherein the outputs from the sub-pump (SP) and an electric motor (MG) are assisted by the output from the assist motor (AM).

Description

technical field [0001] The present invention relates to a control device for controlling a drive source of a construction machine such as a shovel, for example. Background technique [0002] In the hybrid structure of construction machines such as shovels, for example, the excess output of the engine is used to rotate the generator to generate electricity, the electric power is stored in the battery, and the electric motor is driven by the electric power of the battery to operate the driver. In addition, the engine is rotated to generate electricity using the energy discharged from the driver, and the electric power is also stored in the battery, and the electric motor is driven by the electric power of the battery to operate the driver. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2002-275945 [0004] In the above-mentioned conventional control device, there is a problem of a large energy loss during the operation of the actuator, since there is a long process...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned conventional control device, there is a problem that the process of regenerating the discharge energy of the driver, which operates by using the residual output of the engine and the fluid pressure, is long before the operation of the driver, and thus there is a problem of large energy loss during the operation.

[0005] In addition, since the driver is operated by an electric motor, there is a problem that the device itself cannot be used when, for example, a failure occurs in the electrical system.

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