Hybrid construction machine

Patent metadata

Field	Value
Publication number	US-10766480-B2
Application number	US-201715670039-A
Country	US
Kind code	B2
Filing date	Aug 7, 2017
Priority date	Nov 10, 2008
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A hybrid construction machine includes: a motor generator system connected to an internal combustion engine and performing a motor generator operation; an electric power accumulation system connected to the motor generator system; a load drive system connected to the electric power accumulation system and being driven electrically; an abnormality detection part equipped to the motor generator system, the electric power accumulation system and the load drive system; and a main control part determining whether an abnormality has occurred based on a detection value of the abnormality detection part. When the abnormality determination part determines that an abnormality has occurred, the main control part stops a drive of a drive system in which the abnormality is detected in the load drive system.

First claim

What is claimed is:

1. A hybrid construction machine comprising:
a lower running body;
an upper turning body mounted on the lower running body through a turning device;
a motor generator system connected to an internal combustion engine and performing a motor generator operation, the motor generator system including a first inverter and a motor generator, the first inverter controlling an operation of the motor generator, the motor generator being driven by an alternating current output by the first inverter to operate as a motor and being driven by a drive power of the internal combustion engine to operate as a generator;
a load drive system driven electrically, the load drive system including a second inverter and a turning electric motor, the second inverter controlling an operation of the turning electric motor, the turning electric motor being contained in the turning device and driven by an alternating current output by the second inverter to drive the turning device;
an electric power accumulation system connected to the first inverter of the motor generator system and the second inverter of the load drive system, the electric power accumulation system including an electric power accumulator that accumulates DC electric power and a DC bus;
an abnormality detection part operatively connected to the motor generator system, the electric power accumulation system and the load drive system, the abnormality detection part detecting an abnormality in the motor generator system, the electric power accumulation system, and the load drive system; and
a main control part that determines an occurrence of the abnormality based on a detection value of the abnormality detection part,
wherein the main control part stops driving the motor generator system in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

2. The hybrid construction machine as claimed in claim 1 , wherein the main control part stops driving the load drive system in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

3. The hybrid construction machine as claimed in claim 1 , wherein
the abnormality detection part is provided in the electric power accumulation system, and
the main control part stops the electric power accumulation system in response to the detection value of the abnormality detection part exceeding a predetermined threshold value.

4. The hybrid construction machine as claimed in claim 1 , further comprising:
a hydraulic pump driven by the internal combustion engine,
wherein the main control part reduces an output value of the hydraulic pump in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

5. The hybrid construction machine as claimed in claim 1 , wherein the main control part continues driving the internal combustion engine in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

6. The hybrid construction machine as claimed in claim 1 , wherein
the load drive system is connected to the electric power accumulation system, and
wherein the main control part stops driving the load drive system in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

7. The hybrid construction machine as claimed in claim 6 , wherein
the abnormality detection part is provided in the electric power accumulation system, and
the main control part stops the electric power accumulation system in response to the detection value of the abnormality detection part exceeding a predetermined threshold value.

8. The hybrid construction machine as claimed in claim 6 , further comprising:
a hydraulic pump driven by the internal combustion engine,
wherein the main control part reduces an output value of the hydraulic pump in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

9. The hybrid construction machine as claimed in claim 6 , wherein the main control part continues driving the internal combustion engine in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

10. The hybrid construction machine as claimed in claim 1 , wherein
the load drive system is connected to the electric power accumulation system, and
wherein the main control part continues driving the load drive system in response to the abnormality detection part detecting the abnormality in the motor generator system.

11. The hybrid construction machine as claimed in claim 10 , further comprising:
a hydraulic pump driven by the internal combustion engine,
wherein the main control part reduces an output value of the hydraulic pump in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

12. The hybrid construction machine as claimed in claim 10 , wherein the main control part continues driving the internal combustion engine in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

13. The hybrid construction machine as claimed in claim 10 , wherein the main control part stops driving the load drive system in response to the abnormality detection part detecting the abnormality in the electric power accumulation system.

Assignees

• Sumitomo Heavy Industries
• Sumitomo Shi Constr Mach Co

Inventors

• Wu Chunnan
• Kanbayashi Hideaki
• Takanashi Kyoko

Classifications

• B60K6/48 Primary

  Parallel type · CPC title

• B60W50/029

  Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts · CPC title

• E02F9/2091

  Control of energy storage means for electrical energy, e.g. battery or capacitors (energy recovery arrangements in hydraulic or pneumatic drives E02F9/2217) · CPC title

• B60L3/0023

  Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train · CPC title

• B60W10/30

  including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps · CPC title