Construction Machine

Abstract

It is made possible to perform power reduction control during non-operation of control levers, suppress a return to a normal power state when a control lever is accidentally moved, and make a smooth transition to an operation desired to be performed when a return is made to the normal power state. To this end, in a power reduction state, when a first cancellation condition in which two or more control levers are inclined simultaneously is satisfied or when a second cancellation condition in which one lever continues to be inclined is satisfied, a controller 50 determines that an operator “has an intention of canceling power reduction” and cancels power reduction control.

1 . A construction machine comprising:
 a power source;   a plurality of actuators that are actuated by receiving a power output by the power source;   a plurality of control levers that instruct amounts of the power to be distributed to the plurality of actuators;   a plurality of operation state sensors that detect operation states of the plurality of control levers; and   a controller that controls the power source,   the plurality of control levers including a first control lever and a second control lever that operate different actuators of the plurality of actuators, and   the controller being configured to perform power reduction control of reducing the power when a non-operation state of the first and second control levers is continued, wherein   the controller is configured to cancel the power reduction control when a first cancellation condition in which the first and second control levers are operated simultaneously in a state in which the power is reduced is satisfied.   
     
     
         2 . The construction machine according to  claim 1 , wherein
 the controller is configured to   cancel the power reduction control when a second cancellation condition in which one of the first and second control levers is operated in a state in which the power is reduced and the operation state of the one control lever is continued for a predetermined time is satisfied even when the first cancellation condition is not satisfied.   
     
     
         3 . The construction machine according to  claim 1 , further comprising:
 a lower track structure; an upper swing structure swingably mounted on the lower track structure; and a front work implement attached to a front portion of the upper swing structure so as to be rotatable in an upward-downward direction, wherein   the plurality of actuators include a swing motor that swings the upper swing structure with respect to the lower track structure, and first, second and third front implement actuators that drive the front work implement,   the first control lever is a control lever that operates the first and second front implement actuators, and the second control lever is a control lever that operates the swing motor and the third front implement actuator,   the plurality of operation state sensors include first operation state sensors that detect an operation state of the first control lever when the first control lever operates the first front implement actuator, second operation state sensors that detect an operation state of the first control lever when the first control lever operates the second front implement actuator, third operation state sensors that detect an operation state of the second control lever when the second control lever operates the third front implement actuator, and fourth operation state sensors that detect an operation state of the second control lever when the second control lever operates the swing motor, and   the controller is configured to cancel the power reduction control on a basis of detection results of the first, second, third operation state sensors, and the fourth operation state sensor when the first cancellation condition in which the first and second control levers are operated simultaneously is satisfied and the second control lever is not operating the swing motor.   
     
     
         4 . The construction machine according to  claim 1 , wherein
 the power source includes an engine and a hydraulic pump,   the power source generates the power by driving the hydraulic pump by the engine, and   the controller is configured to perform the power reduction control by decreasing a rotation speed of the engine.   
     
     
         5 . The construction machine according to  claim 1 , wherein
 the power source includes an electric power supply device, an electric motor, and a hydraulic pump,   the power source generates the power by driving the electric motor by electric power supply from the electric power supply device, and driving the hydraulic pump by the electric motor, and   the controller is configured to perform the power reduction control by decreasing a rotation speed of the electric motor by reducing the electric power supply to the electric motor.   
     
     
         6 . The construction machine according to  claim 1 , wherein
 the power source includes an electric power supply device,   the actuators are electric actuators including electric motors,   the power source drives the electric actuators by electric power supply from the electric power supply device, and   the controller is configured to perform the power reduction by decreasing rotation speeds of the electric motors by reducing electric power supplied from the electric power supply device to the electric motors.