Construction machine

Patent metadata

Field	Value
Publication number	US-11208788-B2
Application number	US-201916431946-A
Country	US
Kind code	B2
Filing date	Jun 5, 2019
Priority date	Dec 6, 2016
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A construction machine includes a hydraulic actuator and a processor. The processor is configured to detect a predetermined object present within a predetermined area around the construction machine, impose a motion restriction on the construction machine by decreasing the flow rate of hydraulic oil supplied to the hydraulic actuator, in response to detection of the object present within the predetermined area, and relax or cancel the motion restriction by increasing the flow rate to a level lower than before a start of the motion restriction or a level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed or in response to the object being no longer detected within the predetermined area, after the start of the motion restriction.

First claim

The invention claimed is:

1. A construction machine comprising:
a hydraulic actuator; and
a processor configured to
detect a predetermined object present within a predetermined area around the construction machine;
impose a motion restriction on the construction machine by decreasing a flow rate of hydraulic oil supplied to the hydraulic actuator, in response to detection of the object present within the predetermined area; and
relax or cancel the motion restriction by increasing the flow rate to a level lower than before a start of the motion restriction or a level substantially same as before the start of the motion restriction, in response to the object being no longer detected within the predetermined area, after the start of the motion restriction.

2. The construction machine as claimed in claim 1 , further comprising:
a hydraulic pump configured to supply the hydraulic oil to the hydraulic actuator;
an engine configured to drive the hydraulic pump; and
a control valve configured to drive the hydraulic actuator using the hydraulic oil discharged from the hydraulic pump,
wherein the processor is configured to
impose the motion restriction by controlling one or more among the hydraulic pump, the engine, and the control valve, and
relax or cancel the motion restriction by controlling one or more among the hydraulic pump, the engine, and the control valve.

3. The construction machine as claimed in claim 1 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to increase the flow rate at a lower rate in a case where the predetermined operation is performed with the object being detected than in a case where the predetermined operation is performed with the object being undetected, after the start of the motion restriction.

4. The construction machine as claimed in claim 1 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to increase the flow rate at a lower rate as a distance between the object detected at the start of the motion restriction and the construction machine is higher or an alarm level of an alarm output based on the detection of the object at the start of the motion restriction is higher, in response to the predetermined operation being performed or in response to the object being no longer detected within the predetermined area, after the start of the motion restriction.

5. The construction machine as claimed in claim 1 , further comprising:
a turning body,
wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to increase the flow rate at a lower rate with the object detected at the start of the motion restriction having been present within a turning range of the turning body than with said object having being present outside the turning range, in response to the predetermined operation being performed or in response to the object being no longer detected within the predetermined area, after the start of the motion restriction.

6. The construction machine as claimed in claim 1 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to increase the flow rate at a lower rate as an amount of operation of the hydraulic actuator is greater, in response to the predetermined operation being performed or in response to the object being no longer detected within the predetermined area, after the start of the motion restriction.

7. The construction machine as claimed in claim 1 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to relax or cancel the motion restriction such that an amount of increase of the flow rate is smaller with the object being detected than with the object being undetected, in response to the predetermined operation being performed after the start of the motion restriction.

8. The construction machine as claimed in claim 1 , further comprising:
an operating part configured to enable a setting of a condition for the flow rate in a case of relaxing or canceling the motion restriction,
wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed with the operating part.

9. The construction machine as claimed in claim 1 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to relax or cancel the motion restriction with respect to only one or some operating elements among a plurality of operating elements of the construction machine, or to relax or cancel the motion restriction in a manner different for each of the plurality of operating elements, in response to the predetermined operation being performed after the start of the motion restriction.

10. The construction machine as claimed in claim 9 , further comprising:
a turning body,
wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the motion restriction being performed, and to relax the motion restriction in such a manner as to allow the turning body to turn only a predetermined angle, in response to the predetermined operation being performed after the start of the motion restriction.

11. The construction machine as claimed in claim 9 , wherein the processor is further configured to relax or cancel the motion restriction by increasing the flow rate to the level lower than before the start of the motion restriction or the level substantially same as before the start of the motion restriction, in response to a predetermined operation for relaxing or canceling the mot

Assignees

• Sumitomo Shi Constr Mach Co

Inventors

• Izumikawa Takeya

Classifications

• E02F9/24 Primary

  Safety devices {, e.g. for preventing overload (E02F9/226 takes precedence)} · CPC title

• E02F9/2033 Primary

  Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin (sub-groups of E02F3/431 of E02F3/435 take precedence; for turntables E02F9/123) · CPC title

• F15B11/10

  in which the servomotor position is a function of the pressure {also pressure regulators as operating means for such systems, the device itself may be a position indicating system} · CPC title

• F15B2211/75

  Control of speed of the output member · CPC title

• E02F9/2292

  Systems with two or more pumps · CPC title