Hybrid construction machinery and auxiliary control device for the construction machinery

Abstract

The hybrid construction machine has: a control device (80) for switching between a hydraulic-electric composite rotation mode and a hydraulic single rotation mode; The rotating body (20) is driven by the total torque of the electric motor (25) and the hydraulic motor (27). The torque of (27) drives the rotating body (20); and the auxiliary control device (88), which acts as the removed power when the power control unit (55) or the power storage device (24) fails. The control unit (55) or an alternative controller of the power storage device (24) has a monitoring controller connected to the control device (80) and the electric motor (25) to monitor the temperature or leakage of the electric motor (25).

Description

technical field [0001] The present invention relates to a hybrid construction machine and an auxiliary control device for the construction machine. More specifically, it relates to a hybrid construction machine having a rotating body such as a hydraulic excavator and an auxiliary control device for the construction machine. Background technique [0002] In construction machines such as hydraulic excavators, fuels such as gasoline and light oil are used as power sources, and hydraulic pumps are driven by engines to generate hydraulic pressure, thereby driving hydraulic actuators such as hydraulic motors and hydraulic cylinders. Hydraulic actuators are small in size, light in weight and capable of high output power, so they are widely used as actuators of construction machinery. [0003] On the other hand, in recent years, projects have been proposed that use electric motors and power storage devices (battery batteries, electric double layer capacitors, etc.) to improve energy...

AI Technical Summary

Problems solved by technology

[0017] On the other hand, there is a problem that if the electrical system fails, the power supply to the electric motor will be interrupted, and the rotation operation will not be performed at all.

When the construction machinery is operated in such a state and some faults occur in electric systems such as electric motors, inverters, and power storage devices, the above-mentioned induced voltage may be short-circuited by the faulty part to generate an unexpected short-circuit current. Hidden danger

As a result, components such as the IGBT (Insulated Gate Bipolar Transistor: Insulated Gate Bipolar Transistor) constituting the inverter may be damaged, and a part of the electric system may be overheated, resulting in performance degradation.

[0021] In the above-mentioned patent documents, there is no clear description of the specific working methods when the electrical system fails.

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