초록 ▼

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

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.

대표청구항 ▼

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, said motor generator system including a f

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, said motor generator system including a first inverter and a motor generator driven by an alternating current output by the first inverter;an electric power accumulation system connected to said motor generator system, said electric power accumulation system including an electric power accumulator, a DC bus, and an up-down direct current voltage converter that is disposed between the electric power accumulator and the DC bus;a load drive system connected to said electric power accumulation system and being driven electrically, said load drive system including a second inverter and a turning electric motor that is contained in said turning device and that is driven by an alternating current output by the second inverter;an abnormality detection part operatively connected to said motor generator system, said electric power accumulation system and said load drive system; anda main control part determining whether an abnormality has occurred based on a detection value of said abnormality detection part,wherein said abnormality detection part detects an abnormality in said motor generator system, said electric power accumulation system, and said load drive system,wherein said abnormality detection part determines that an abnormality has occurred, and said main control part stops a drive of one of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which the abnormality is detected, after said abnormality detection part determines that the abnormality has occurred, and continues or stops a drive of each of the other of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which a lack of the abnormality has occurred, in accordance with the one of said motor generator system, said electric power accumulation system and said load drive system, in which the abnormality is detected,wherein said main control part continues driving said electric power accumulation system when an abnormality is detected in said motor generator system, andwherein the hybrid construction machine further comprises 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. 2. The hybrid construction machine as claimed in claim 1, further comprising 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. 3. The hybrid 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. 4. The hybrid 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. 5. The hybrid 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. 6. The hybrid 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; anda 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. 7. The hybrid 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. 8. The hybrid 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 the up-down direct current voltage converter and the 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 up-down direct current voltage converter to increase an output dependency to said internal combustion engine to be larger than 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 to be larger than the output dependency to said internal combustion engine when an abnormality of said internal combustion engine is detected by engine system abnormality detection part. 9. The hybrid construction machine as claimed in claim 1, further comprising: a drive control apparatus of the up-down direct current voltage converter connected between said electric power accumulation system and a load that performs both a power running operation and a regenerative operation; anda current detection part that detects a current flowing in the up-down direct current voltage converter,wherein said main control part drives the up-down direct current voltage converter so that a voltage value of the DC bus between said load and the up-down direct current voltage converter follows a target voltage value, andwherein, when a current value detected by said current detection part exceeds a first threshold value, said main control part causes a drive of the up-down direct current voltage 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 the up-down direct current voltage 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. 10. The hybrid construction machine as claimed in claim 1, wherein said DC bus is 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. 11. The hybrid construction machine as claimed in claim 1, 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. 12. The hybrid construction machine as claimed in claim 1, further comprising 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. 13. 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, said motor generator system including a first inverter and a motor generator driven by an alternating current output by the first inverter;an electric power accumulation system connected to said motor generator system, said electric power accumulation system including an electric power accumulator, a DC bus, and an up-down direct current voltage converter that is disposed between the electric power accumulator and the DC bus;a load drive system connected to said electric power accumulation system and being driven electrically, said load drive system including a second inverter and a turning electric motor that is contained in said turning device and that is driven by an alternating current output by the second inverter;an abnormality detection part operatively connected to said motor generator system, said electric power accumulation system and said load drive system; anda main control part determining whether an abnormality has occurred based on a detection value of said abnormality detection part,wherein said abnormality detection part detects an abnormality in said motor generator system, said electric power accumulation system, and said load drive system,wherein said abnormality detection part determines that an abnormality has occurred, and said main control part stops a drive of one of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which the abnormality is detected, after said abnormality detection part determines that the abnormality has occurred, and continues or stops a drive of each of the other of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which a lack of the abnormality has occurred, in accordance with the one of said motor generator system, said electric power accumulation system and said load drive system, in which the abnormality is detected,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, andwherein said DC bus is 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, andwherein the hybrid construction machine further comprises 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. 14. The hybrid construction machine as claimed in claim 13, 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. 15. 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, said motor generator system including a first inverter and a motor generator driven by an alternating current output by the first inverter;an electric power accumulation system connected to said motor generator system, said electric power accumulation system including an electric power accumulator, a DC bus, and an up-down direct current voltage converter that is disposed between the electric power accumulator and the DC bus;a load drive system connected to said electric power accumulation system and being driven electrically, said load drive system including a second inverter and a turning electric motor that is contained in said turning device and that is driven by an alternating current output by the second inverter;an abnormality detection part operatively connected to said motor generator system, said electric power accumulation system and said load drive system; anda main control part determining whether an abnormality has occurred based on a detection value of said abnormality detection part,wherein said abnormality detection part detects an abnormality in said motor generator system, said electric power accumulation system, and said load drive system,wherein said abnormality detection part determines that an abnormality has occurred, and said main control part stops a drive of one of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which the abnormality is detected, after said abnormality detection part determines that the abnormality has occurred, and continues or stops a drive of each of the other of said motor generator of said motor generator system, said up-down direct current voltage converter of said electric power accumulation system and said turning electric motor of said load drive system, in which a lack of the abnormality has occurred, in accordance with the one of said motor generator system, said electric power accumulation system and said load drive system, in which the abnormality is detected,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, andwherein said DC bus is 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, andwherein the hybrid construction machine further comprises 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.