US 12,734,921 B2Granted

Control system for electric work vehicle

AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.

InventorsMasato Arata, Fumiaki Ito

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Abstract

[Problem] In a control system for an electric work vehicle, a space for a size increase of other components such as a high-voltage battery is increased, and a labor for battery replacement is reduced by eliminating a need for mounting a low-voltage battery. [Solution] The control system includes a traveling motor to which power is fed from a battery via a main switch, a control device which controls an ON/OFF state of the main switch, and a first start switch connected between an output side of a DC-DC converter and the control device and is configured such that a primary side of the main switch is connected to an input side of the DC-DC converter with a second start switch interposed, and the control device is started by an output voltage of the DC-DC converter by an operation of the second start switch to an energized position. The control device turns on the main switch and maintains the state when the second start switch is operated to an energized position and the first start switch is at an operation position to the energized position.

Claims5

Dependent claims

A control system for an electric work vehicle, comprising:

a battery;
a traveling motor to which power is fed from the battery via a main switch;
a control device which controls an ON/OFF state of the main switch;
a DC-DC converter which steps down a voltage of the battery and outputs the voltage to the control device, and
a first start switch which is interposed and connected between an output side of the DC-DC converter and the control device and capable of manual energization, wherein
a primary side of the main switch is connected to an input side of the DC-DC converter with a second start switch capable of manual energization interposed therebetween, a secondary side of the main switch is directly connected to the input side of the DC-DC converter, and the control device is started by an output voltage of the DC-DC converter by an operation of the second start switch to an energized position;
and
when the second start switch is operated to the energized position and the first start switch is at the energized position, the control device turns on the main switch and maintains an ON state of the main switch even after the operation of the second start switch to a shut-off position.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/321,882Filed 23 May 2023
Priority: JP 2022-0918956 Jun 2022
Published: US 2023/0391220 A17 Dec 2023
Granted: 15 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B60L 53/62
Monitoring or controlling charging stations: in response to charging parameters, e.g. current, voltage or electrical charge
B60L 58/10
Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles: for monitoring or…
B60L 50/51
Using propulsion power supplied by batteries or fuel cells: characterised by AC-motors
B60L 53/22
Characterised by converters located in the vehicle: constructional details or arrangements of charging converters specially adapted for charging…