Work machine
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsMasafumi HITA, Yasuhiko KANARI
Life of this patent
Estimating the term…
Abstract
When a machine-control ON/OFF switch is switched to the ON position, a controller outputs either a first control signal generated by an operation lever or a second control signal that operates a boom cylinder in accordance with a predetermined condition; when the ON/OFF switch is switched to the OFF position, the controller outputs the first control signal; when a control signal has been switched from one of the first control signal and the second control signal to the other control signal by the operation of the ON/OFF switch, the controller applies a rate limit to the control signal, and controls the boom cylinder on the basis of the control signal obtained after the limitation.
Claims6
A work machine comprising:
- a work implement;
- a first hydraulic actuator that drives the work implement;
- an operation device that outputs a first control signal for the first hydraulic actuator in accordance with an operation by an operator;
- a controller that, while the operation device is being operated, calculates a second control signal for operating the first hydraulic actuator in accordance with a predetermined condition, and controls the first hydraulic actuator on a basis of either the first control signal or the second control signal;
- and
- a switching device that can select a switch position of either an ON position enabling control of the first hydraulic actuator or an OFF position disabling control of the first hydraulic actuator, the control being based on the second control signal, wherein
- the controller
- controls the first hydraulic actuator on a basis of either the first control signal or the second control signal when the switching device is switched to the ON position,
- controls the first hydraulic actuator on a basis of the first control signal when the switching device is switched to the OFF position,
- limits, to a predetermined change rate, a control-signal temporal change rate at which one of the first control signal and the second control signal is changed to other of the one control signal, and controls the first hydraulic actuator on a basis of a control signal obtained after the limitation, when a control signal for controlling the first hydraulic actuator has been switched from the one control signal to the other control signal by a switching operation on the switching device, and
- controls an operation speed of the first hydraulic actuator so as to be a value lower than a maximum speed when the switching device is switched to the ON position.
(canceled)
Dependencies are inferred from the claim text.