US-12617297-B2 - Construction machine

US12617297B2US 12617297 B2US12617297 B2US 12617297B2US-12617297-B2

Abstract

An exemplary construction machine comprises a power supply device that is connected to an external power source and outputs first power, a battery provided to be chargeable with the first power, and an electric motor that is driven by the first power and/or second power discharged by the battery. The construction machine further comprises a control device that controls the construction machine in any of a plurality of modes including a drive chargeable mode in which the first power can be used for charging the battery while being used for driving the electric motor, and a charge-only mode in which the first power can be used only for charging the battery. In the case of the drive chargeable mode, the control device sets the upper limit value of the amount of charge of the battery lower than in the case of the charge-only mode.

Inventors

Shoto MORISHITA
Kensuke Kaneda

Assignees

Yanmar Holdings Co., Ltd.

Dates

Publication Date: 20260505
Application Date: 20211209
Priority Date: 20210114

Claims (7)

1 . A construction machine comprising: a power supply device that is connected to an external power source and outputs a first power; a battery that is so provided as to be capable of being charged by the first power; an electric motor that is driven by at least one of the first power or a second power, wherein the second power is output by the battery, and a control device that exercises control over a plurality of modes of the construction machine including a battery drive mode in which the electric motor is driven solely by the second power, and a drive chargeable mode in which the first power, while being used for driving the electric motor, is capable of charging the battery, and wherein the control device sets a first upper limit that controls a state of charge of the battery in the drive chargeable mode, wherein the first upper limit is set to be lower than a second upper limit that controls the state of charge of the battery when in the battery drive mode.
2 . A construction machine comprising: a power supply device that is connected to an external power source and outputs a first power; a battery that is so provided as to be capable of charging the first power; an electric motor that is driven by at least one of the first power or a second power, wherein the second power is output by the battery, and a control device that exercises control over a plurality of modes of the construction machine including a drive chargeable mode in which the first power, while being used for driving the electric motor, is capable of charging the battery, and a charge-only mode in which the first power is used to charge the battery without driving the electric motor, and wherein the control device sets a first upper limit that controls a state of charge of the battery in the drive chargeable mode, wherein the first upper limit is set to be lower than a second upper limit that controls the state of charge of the battery when in the charge-only mode.
3 . The construction machine according to claim 2 , wherein the plurality of modes further includes a battery drive mode in which the electric motor is driven solely by the second power.
4 . The construction machine according to claim 1 , wherein the control device, when charging the battery while the electric motor is being driven by the first power in the drive chargeable mode, changes a charging rate based on the state of charge of the battery and specific information external to the control unit.
5 . The construction machine according to claim 4 , wherein the specific information includes a temperature of the battery.
6 . The construction machine according to claim 4 , wherein the control device further controls a current supplied from the power supply device based on power consumed by the electric motor and the changes to the charging rate.
7 . The construction machine according to claim 1 , wherein in the drive chargeable mode, the electric motor is driven by at least one of the first power or the second power.

Description

CROSS-REFERENCE This application is a US National Stage Application under 35 U.S.C. § 371 of International Application No. PCT/JP2021/045292 filed Dec. 9, 2021, which claims foreign priority of JP2021-004339 filed Jan. 14, 2021 and the disclosures of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD The present invention relates to a construction machine. BACKGROUND ART Conventionally, it is preferable that, from the viewpoint of preventing a battery from being deteriorated, the battery including a lithium-ion battery, etc., should be stored in a state where the state of charge is not too high and not too low (see, for example, Patent Literature 1). In this respect, Patent Literature 1 discloses an optimal method for storing, in a construction machine with a built-in battery, a battery when the construction machine is not in use. CITATION LIST Patent Literature Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2014-014239 DISCLOSURE OF INVENTION Problems to be Solved by the Invention By the way, an electric hydraulic excavator with a built-in battery, as the case may be, is used in a state where a cable is connected to an external power source such as a commercial power source. That is, there is present a construction machine that can work using the external power source and the battery power source in combination. The above the construction machine can use the external power source thereby to charge the battery during the work; there is a concern that insufficient control of charging the battery during the work may accelerate deterioration of the battery. The method disclosed in Patent Literature 1 is a method for a case free from performing the work with the construction machine, and thus cannot be applied as is. It is an object of the present invention is to provide, in a construction machine provided with a battery that is chargeable by an external power source, a technology capable of suppressing a battery from being deteriorated. Means for Solving the Problems An exemplary construction machine of the present invention includes: a power supply device that is connected to an external power source and outputs first power; a battery that is so provided as to be capable of charging the first power; and an electric motor that is driven by at least one of the first power and second power which is discharged by the battery. The construction machine further includes a control device that controls the own machine in any of a plurality of modes including a battery drive mode in which only the second power is usable for driving the electric motor, and a drive chargeable mode in which the first power, while being used for driving the electric motor, is usable for charging the battery. The control device, in the drive chargeable mode, sets an upper limit of a state of charge of the battery lower than in the battery drive mode. Further, an exemplary construction machine of the present invention includes: a power supply device that is connected to an external power source and outputs first power; a battery that is so provided as to be capable of charging the first power; and an electric motor that is driven by at least one of the first power and second power which is discharged by the battery. The construction machine further includes a control device that controls the own machine in any of a plurality of modes including a drive chargeable mode in which the first power, while being used for driving the electric motor, is usable for charging the battery, and a charge-only mode in which the first power is usable only for charging the battery. The control device, in the drive chargeable mode, sets an upper limit of a state of charge of the battery lower than in the charge-only mode. Effect of the Invention The exemplary present invention, in the construction machine provided with a battery that is chargeable by an external power source, can suppress a battery from being deteriorated. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view of a schematic configuration of a construction machine. FIG. 2 is a lock diagram showing a schematic configuration of a hydraulic system provided in the construction machine. FIG. 3 is Block diagram showing a schematic configuration of a power source system provided in the construction machine. FIG. 4A is a schematic diagram showing the state set in a first mode. FIG. 4B is a schematic diagram showing the state set in a second mode. FIG. 4C is a schematic diagram showing the state set in a third mode. FIG. 5A is a schematic diagram showing a case where a first state is selected in the second mode. FIG. 5B is a schematic diagram showing a case where a second state is selected in the second mode. FIG. 5C is a schematic diagram showing a case where a third state is selected in the second mode. FIG. 5D is a schematic diagram showing a case where a fourth state is selected in the second mode. FIG. 6 is a block diagram showing a schematic of