Granted Patent B2

US 12,473,715 · App. 18/025,440 · Granted Nov 18, 2025

Inventors: Takashi Saegusa (Tokyo, JP); Yuuki Nagaoka (Tsuchiura, JP); Makoto Saen (Tsuchiura, JP); Kazuhiro Shibamori (Tsuchiura, JP)

Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.

E02F9/205H04W24/08

Abstract

Claims (51)

1 . A work machine comprising:

a body;

a work implement attached to the body; and

a controller that executes a transmission process of transmitting machine-body data to an external apparatus installed outside the body,

wherein the controller is configured to:

measure a speed of communication with the external apparatus,

place a functional restriction on the transmission process when the speed of communication is lower than a predetermined required speed,

reinforce the functional restriction on the transmission process as the speed of communication lowers,

reinforce the functional restriction on the transmission process when a state of the work machine is an operation state, as compared to a case where the state of the work machine is not the operation state,

reinforce the functional restriction on the transmission process as the speed of communication lowers, by executing a data-reduced transmission process of transmitting the machine-body data while regularly thinning out the data at predetermined time intervals, when the speed of communication is lower than the required speed but equal to or higher than a predetermined allowable speed, and executing a transmission suspension process of suspending the transmission of the machine-body data, when the speed of communication is lower than the allowable speed, and

reinforce the functional restriction on the transmission process when the state of the work machine is the operation state, as compared to the case where the state of the work machine is not the operation state, by making a data reduction amount, in the data-reduced transmission process executed when the state of the work machine is the operation state, greater than the data reduction amount in the data-reduced transmission process executed when the state of the work machine is not the operation state.

2 . The work machine according to claim 1 ,

wherein the controller is configured to:

compute a data storage time on a basis of the speed of communication and a data storage amount associated with the state of the work machine,

store the machine-body data on a buffer memory when the speed of communication is lower than the required speed and the data storage time is equal to or longer than predetermined data storage allowable time, and

execute a buffering process of transmitting the machine-body data stored on the buffer memory to the external apparatus when the speed of communication becomes equal to or higher than the required speed, and

wherein a data storage amount at a time when the state of the work machine is the operation state is smaller than a data storage amount at a time when the state of the work machine is not the operation state.

3 . The work machine according to claim 2 ,

wherein the body has a travel structure,

wherein the operation state includes a travelling state where the travel structure is in operation and a working state where the work implement is in operation, and

wherein a data storage amount at a time when the state of the work machine is the working state is smaller than a data storage amount at a time when the state of the work machine is the travelling state.

4 . The work machine according to claim 1 ,

wherein the controller is configured to:

transmit a retry request for resumption of the transmission process to the external apparatus when the speed of communication becomes equal to or higher than the required speed after the transmission suspension process has been executed.

5 . The work machine according to claim 1 ,

wherein the controller is configured to:

acquire, from the external apparatus, the required speed, a processing profile defining a plurality of processing methods, and a plurality of choice conditions used to choose from the plurality of processing methods defined by the processing profile,

determine whether or not the plurality of choice conditions are satisfied, when the speed of communication is lower than the required speed, and choose a processing method on a basis of a result of the determination, and

execute the transmission process according to the chosen processing method.

6 . The work machine according to claim 5 ,

wherein the processing profile:

defines the plurality of processing methods that are combinations of the data-reduced transmission process of transmitting the machine-body data while thinning out the data, a buffering process of storing the machine-body data on a buffer memory and transmitting the machine-body data stored on the buffer memory to the external apparatus when the speed of communication becomes equal to or higher than the required speed, the transmission suspension process of suspending the transmission of the machine-body data, and a retry request process of transmitting a retry request for resumption of the transmission process to the external apparatus when the speed of communication becomes equal to or higher than the required speed after the transmission suspension process has been executed,

wherein the controller is configured to acquire, from the external apparatus, data-reduction-related data associated with the data-reduced transmission process and buffer-related data associated with the buffering process,

wherein the data-reduction-related data defines information that identifies data to be subjected to the data-reduced transmission process, and a data reduction amount in the data-reduced transmission process, and

wherein the buffer-related data defines information that identifies data to be subjected to the buffering process, and a buffer amount in the buffering process.

7 . The work machine according to claim 1 ,

wherein the controller includes:

a communication terminal that communicates with the external apparatus via a first communication network, and

a plurality of control units that are interconnected via a second communication network and control equipment included in the work machine,

wherein the plurality of control units include an information control unit that executes the transmission process of transmitting the machine-body data to the external apparatus,

wherein the information control unit includes:

a first communication interface that is connected to the communication terminal and performs data exchange with the external apparatus via the first communication network, and

a second communication interface that performs data exchange with the plurality of control units connected to the information control unit via the second communication network,

wherein the plurality of control units include a work control unit that controls an operation of the work implement, and

wherein the information control unit manages the state of the work machine on a basis of information acquired from the work control unit via the second communication interface.

8 . The work machine according to claim 7 , further comprising:

an image-capturing device connected to the second communication network,

wherein the information control unit is configured to:

transmit data of an image captured by the image-capturing device to the external apparatus via the first communication network, and

receive a command for remotely operating the work machine, from the external apparatus via the first communication network, and

wherein the work control unit controls an operation of the work implement of the work machine on a basis of the command input from the information control unit via the second communication network.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (17)