Hybrid vehicle power control apparatus and hybrid construction equipment using the power control apparatus

A hybrid construction machine comprising:

• an engine;
• a generator driven by the engine;
• a storage device;
• an electric motor driven by electric power supplied from at least one of the generator and the storage device;
• a load including an actuator for actuating a working attachment;
• and
• a power control apparatus including:
• a first power converter provided between said generator and a direct-current (DC) line for converting the power output from the generator to DC power to output the DC power to said DC line;
• a second power converter provided between said storage device and said DC line for converting the power output from said storage device to DC power to output the DC power to said DC line;
• a motor driver electrically connected with said DC line for driving said motor based on the power supplied by way of the DC line;
• and
• a power controller for controlling said first power converter and said second power converter to output DC power corresponding to demanded power for said actuator by way of said motor to said DC line, said power controller controlling said first power converter and said second power converter to maintain a voltage of said DC line at a substantially constant level irrespective of wide variation of the demanded power for said load.

A power control apparatus for a hybrid vehicle provided with an engine, a generator driven by the engine, at least one storage device, an electric motor driven by electric power supplied from at least one of the generator and the storage device, and a load operated by the motor as a drive source, the power control apparatus comprising:

• a first power converter provided between said generator and a direct-current line for converting the power outputted from the generator to DC power to output the DC power to said direct-current line;
• at least one second power converter provided between said storage device and said direct-current line for converting the power outputted from said storage device to DC power to output the DC power to said direct-current line;
• a motor driver electrically connected with said direct-current line for driving said motor based on the power supplied by way of the direct-current line;
• and
• a power controller for controlling said first power converter and said second power converter to output DC power corresponding to demanded power for said load by way of said motor to said direct-current line,
• wherein said power controller controls said first power converter and said second power converter to maintain a voltage of said direct-current line at a substantially constant level irrespective of wide variation or drastic change of the demanded power for said load.

A hybrid construction machine comprising:

• an engine;
• a generator driven by the engine;
• a storage device;
• an electric motor driven by electric power supplied from at least one of the generator and the storage device;
• a load including an actuator for actuating a working attachment;
• and
• a power control apparatus including:
• a first power converter provided between said generator and a direct-current (DC) line for converting the power output from the generator to DC power to output the DC power to said DC line;
• a second power converter provided between said storage device and said DC line for converting the power output from said storage device to DC power to output the DC power to said DC line;
• a motor driver electrically connected with said DC line for driving said motor based on the power supplied by way of the DC line;
• and
• a power controller for controlling said first power converter and said second power converter to output DC power corresponding to demanded power for said actuator by way of said motor to said DC line, said power controller controlling said first power converter and said second power converter to maintain a voltage of said DC line at a substantially constant level irrespective of wide variation or drastic change of the demanded power for said load.