HYBRID-TYPE CONSTRUCTION MACHINE

• US 20110251746A1
• Filed: 11/09/2009
• Published: 10/13/2011
• Est. Priority Date: 11/10/2008
• Status: Active Grant

• Current Assignee: Sumitomo Construction Machinery Sales Company Limited (Sumitomo Heavy Industries Limited), Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Construction Machinery Sales Company Limited (Sumitomo Heavy Industries Limited), Sumitomo Heavy Industries Limited
• Inventors: Takanashi, Kyoko, Kanbayashi, Hideaki, Wu, Chunnan
• Granted Patent: US 9,725,008 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/20 Energy regeneration from auxiliary equipment
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 3/0023 Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2510/242 for electrical energy
• CPC Class Codes: B60W 30/1886 Controlling power supply to auxiliary devices
• CPC Class Codes: B60W 50/029 Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
• CPC Class Codes: B60Y 2200/25 Track vehicles
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: E02F 9/123 Drives or control devices specially adapted therefor E02F9/125 and E02F9/128 take precedence
• CPC Class Codes: E02F 9/2058 : Electric or electro-mechanical or mechanical control devices of vehicle sub-units for vehicles in general B60W
• CPC Class Codes: E02F 9/2075 : of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2091 : Control of energy storage means for electrical energy, e.g. battery or capacitors energy recovery arrangements in hydraulic or pneumatic drives E02F9/2217
• CPC Class Codes: E02F 9/2246 : Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: E02F 9/26 : Indicating devices E02F5/145 takes precedence
• CPC Class Codes: F02D 29/06 : peculiar to engines driving electric generators
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A hybrid-type 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.

Claims

1. A hybrid-type construction machine comprising:

a motor generator system connected to an internal combustion engine and performing a motor generator operation;

an electric power accumulation system connected to said motor generator system;

a load drive system connected to said electric power accumulation system and being driven electrically;

an abnormality detection part operatively connected to said motor generator system, said electric power accumulation system and said load drive system; and

a main control part determining whether an abnormality has occurred based on a detection value of said abnormality detection part,

wherein, when said abnormality determination part determines that an abnormality has occurred, said main control part stops a drive of one of said motor generator system, said electric power accumulation system and said load drive system, in which the abnormality is detected.

2. The hybrid-type construction machine as claimed in claim 1, wherein said main control part continues driving said motor generator system and said electric power accumulation system when an abnormality is detected in said load drive system.

3. The hybrid-type construction machine as claimed in claim 1, wherein said main control part continues driving said electric power accumulation system when an abnormality is detected in said motor generator system.

4. The hybrid-type construction machine as claimed in claim 2, comprising a DC bus connected with said electric power accumulation system, said load drive system and said motor generator system, and wherein said main control part performs a control of said electric power accumulation system so that a voltage value of said DC bus becomes a previously determined target value after a determination of an abnormality of said motor generator system or said load drive system is made by said abnormality detection part.

5. The hybrid-type construction machine as claimed in claim 2, wherein said electric power accumulation system is equipped with an electric power accumulation system abnormality detection part, and, when a detection value of said electric power accumulation system exceeds a previously determined threshold value, said main control part stops said electric power accumulation system.

6. The hybrid-type construction machine as claimed in claim 2, further comprising an electric power accumulator contained in said electric power accumulation system and a charge voltage value detection part detecting a charge voltage value of said electric power accumulator, and wherein, when the charge voltage value detected by said charge voltage value detection part is apart from a previously determined range for each occurrence of an abnormality determination of said load drive system, said main control part stops driving said motor generator system.

7. The hybrid-type construction machine as claimed in claim 1, further comprising a work element driven by a hydraulic pressure generated by a drive force of said internal combustion engine or said motor generator, and an electric work element which is driven electrically, and wherein, when an abnormality of said electric power accumulation system is detected by said abnormality detection part, said main control part stops driving said electric work element.

8. The hybrid-type construction machine as claimed in claim 1, wherein, when an abnormality is detected in said motor generator system or said electric power accumulation system, said main control part stops driving said load drive system.

9. The hybrid-type construction machine as claimed in claim 1, wherein said load drive system is an attraction system connected to said electric power accumulation system, and said main control part continues driving said attraction system before and after an abnormality determination.

10. The hybrid-type construction machine as claimed in claim 1, further comprising a hydraulic pump driven by said internal combustion engine, and wherein said main control part includes an assist abnormality determination part, which determines an assist abnormality based on a detection value of said abnormality detection part, and an engine-stall prevention part, which maintains an output upper limit value of said internal combustion engine at a higher state than an output value of said hydraulic pump when a determination of the assist abnormality is made by said assist abnormality determination part.

11. The hybrid-type construction machine as claimed in claim 1, further comprising:

a cooling apparatus cooling a drive control part of a motor generator or a drive control part of said motor generator contained in said motor generator system; and

a cooling abnormality detection part provided in said cooling apparatus to detect an abnormality of said cooling apparatus,

wherein said main control part performs an abnormality determination of said cooling apparatus based on a result of detection of said cooling abnormality detection part, and continues a control of said motor generator system and said electric power accumulation system before and after the abnormality determination.

12. The hybrid-type construction machine as claimed in claim 1, further comprising a hydraulic pump that is driven by said internal combustion engine, wherein said main control part, when it detects an abnormality of a hydraulic system, sets an output upper limit value of said hydraulic pump to a value lower than that in a normal time.

13. The hybrid-type construction machine as claimed in claim 1, further comprising at least one of an electric power accumulation system abnormality detection part that detects an abnormality of said electric power accumulation system containing a direct current voltage converter and an electric power accumulator, and an engine system abnormality detection part that detects an abnormality of said internal combustion engine,

wherein said main control part controls an inverter circuit and said direct current voltage converter to increase an output dependency to said internal combustion engine relatively as compared to an output dependency to said electric power accumulation system when an abnormality of said electric power accumulation system is detected by said electric power accumulation system abnormality detection part, and increase the output dependency to said electric power accumulation system relatively as compared to the output dependency to said internal combustion engine when an abnormality of said internal combustion engine is detected by engine system abnormality detection part.

14. The hybrid-type construction machine as claimed in claim 1, further comprising:

a drive control apparatus of an up-down converter connected between said electric power accumulation system and a load that performs both a power running operation and a regenerative operation; and

a current detection part that detects a current flowing in said up-down converter,

wherein said main control part drives said up-down converter so that a voltage value of a DC bus between said load and said up-down converter follows a target voltage value, and

wherein, when a current value detected by said current detection part exceeds a first threshold value, said main control part causes a drive of said up-down converter to stop, and, when a current value detected by said current detection part decreases to a second threshold value lower than said first threshold value, said main control part causes a drive of said up-down converter to resume, and, when a number of times where a current value detected by said current detection part exceeds said first threshold value becomes equal to or larger than a predetermined number of times, said main control part determines that an abnormality due to an over-current has occurred.

15. The hybrid-type construction machine as claimed in claim 3, comprising a DC bus connected with said electric power accumulation system, said load drive system and said motor generator system, and wherein said main control part performs a control of said electric power accumulation system so that a voltage value of said DC bus becomes a previously determined target value after a determination of an abnormality of said motor generator system or said load drive system is made by said abnormality detection part.

16. The hybrid-type construction machine as claimed in claim 3, wherein said electric power accumulation system is equipped with an electric power accumulation system abnormality detection part, and, when a detection value of said electric power accumulation system exceeds a previously determined threshold value, said main control part stops said electric power accumulation system.

17. The hybrid-type construction machine as claimed in claim 3, further comprising an electric power accumulator contained in said electric power accumulation system and a charge voltage value detection part detecting a charge voltage value of said electric power accumulator, and wherein, when the charge voltage value detected by said charge voltage value detection part is apart from a previously determined range for each occurrence of an abnormality determination of said load drive system, said main control part stops driving said motor generator system.

18. The hybrid-type construction machine as claimed in claim 3, further comprising a work element driven by a hydraulic pressure generated by a drive force of said internal combustion engine or said motor generator, and an electric work element which is driven electrically, and wherein, when an abnormality of said electric power accumulation system is detected by said abnormality detection part, said main control part stops driving said electric work element.

19. The hybrid-type construction machine as claimed in claim 4, further comprising an electric power accumulator contained in said electric power accumulation system and a charge voltage value detection part detecting a charge voltage value of said electric power accumulator, and wherein, when the charge voltage value detected by said charge voltage value detection part is apart from a previously determined range for each occurrence of an abnormality determination of said load drive system, said main control part stops driving said motor generator system.

20. The hybrid-type construction machine as claimed in claim 4, further comprising a work element driven by a hydraulic pressure generated by a drive force of said internal combustion engine or said motor generator, and an electric work element which is driven electrically, and wherein, when an abnormality of said electric power accumulation system is detected by said abnormality detection part, said main control part stops driving said electric work element.