WORKING MACHINE
First Claim
1. A working machine comprising:
- a working motor which is driven by an operator'"'"'s operation;
a DC busbar which is connected to the working motor via a first inverter circuit;
a storage battery which is connected to the DC busbar via a DC voltage converter and a switch;
a control unit which controls the first inverter circuit, the DC voltage converter, and the switch;
a cooling motor which drives a cooling fan and/or a cooling liquid circulating pump used for cooling at least one of the first inverter circuit, the DC voltage converter, and the control unit; and
a cooling motor driving circuit which is connected between the cooling motor and the DC busbar and is controlled by the control unit to drive the cooling motor,wherein the control unit includes a busbar voltage lowering mode decreasing a voltage of the DC busbar when the operation of the working machine is stopped, and decreases the voltage of the DC busbar in a manner such that the cooling motor driving circuit is operated after the switch enters a disconnection state to consume electricity in the cooling motor in the busbar voltage lowering mode.
1 Assignment
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Accused Products
Abstract
Provided is a working machine capable of decreasing a voltage of a DC busbar (DC bus) with a configuration suppressing a degradation in reliability.
A hybrid type construction machine as a working machine includes: a DC bus which is connected to a rotation motor via an inverter circuit, a battery which is connected to the DC bus via a step-up/step-down converter and a switch, a controller which drives the inverter circuit and the step-up/step-down converter, a cooling liquid circulating system which includes a pump motor, and an inverter circuit which is connected to the DC bus and driving the pump motor. The controller includes a mode used for decreasing the voltage of the DC bus, and in that mode, the switch enters a disconnection state and the inverter circuit is operated to consume electricity in the pump motor.
54 Citations
20 Claims
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1. A working machine comprising:
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a working motor which is driven by an operator'"'"'s operation; a DC busbar which is connected to the working motor via a first inverter circuit; a storage battery which is connected to the DC busbar via a DC voltage converter and a switch; a control unit which controls the first inverter circuit, the DC voltage converter, and the switch; a cooling motor which drives a cooling fan and/or a cooling liquid circulating pump used for cooling at least one of the first inverter circuit, the DC voltage converter, and the control unit; and a cooling motor driving circuit which is connected between the cooling motor and the DC busbar and is controlled by the control unit to drive the cooling motor, wherein the control unit includes a busbar voltage lowering mode decreasing a voltage of the DC busbar when the operation of the working machine is stopped, and decreases the voltage of the DC busbar in a manner such that the cooling motor driving circuit is operated after the switch enters a disconnection state to consume electricity in the cooling motor in the busbar voltage lowering mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification