US 12,459,400 B2
Working machine
Go Takaki, Osaka (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Jun. 3, 2022, as Appl. No. 17/831,936.
Application 17/831,936 is a continuation of application No. PCT/JP2020/028105, filed on Jul. 20, 2020.
Claims priority of application No. 2019-232041 (JP), filed on Dec. 23, 2019.
Prior Publication US 2022/0289073 A1, Sep. 15, 2022
Int. Cl. B60L 58/26 (2019.01)
CPC B60L 58/26 (2019.02) [B60L 2200/40 (2013.01); B60L 2240/425 (2013.01); B60L 2240/545 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A working machine comprising:
a battery unit;
an electrical component that is driven by electric power supplied from the battery unit;
a radiator that cools cooling water;
an electrical-component cooling water channel along which the cooling water delivered from an outflow port of the radiator is supplied to the electrical component and the cooling water after cooling the electrical component circulates to an inflow port of the radiator;
a switching unit provided on the electrical-component cooling water channel;
a battery cooling water channel along which the cooling water is supplied from the switching unit to the battery unit and the cooling water after cooling the battery unit flows to the electrical-component cooling water channel; and
a controller that controls operation of the switching unit,
wherein the electrical component includes an electric motor that is driven by electric power, and
wherein the controller
determines a load on the electric motor,
switches the switching unit to a first state when the controller determines that the load on the electric motor is less than a predetermined value, the first state being a state of blocking a flow of the cooling water from the electrical-component cooling water channel to the battery cooling water channel, and
switches the switching unit to a second state when the controller determines that the load on the electric motor is more than or equal to the predetermined value, the second state being a state of causing the cooling water to flow from the electrical-component cooling water channel to the battery cooling water channel.