Control device for construction machine and method of controlling construction machine

1. A control device for a construction machine including a working unit including at least a bucket connected to an arm, the control device for a construction machine comprising:

an operational amount data acquisition unit configured to acquire operational amount data indicating an operational amount of the working unit;

an operation determination unit configured to determine a non-operation state of the bucket on the basis of the operational amount data;

a distance data acquisition unit configured to acquire distance data indicating a distance between the bucket and a target excavation profile;

a bucket control determination unit configured to determine whether bucket control conditions are satisfied, on the basis of determination of the non-operation state; and

a working unit control unit configured, when the bucket control conditions are determined to be satisfied, to output a control signal for controlling the bucket to maintain an attitude of the working unit of when the bucket control conditions are determined to be satisfied,

wherein the bucket control conditions include the distance between the bucket and the target excavation profile is not larger than a first threshold, and the arm being driven.

2. The control device for the construction machine according to claim 1 , wherein

the working unit further includes a boom and an arm, and

the state of the working unit maintained when the bucket control conditions are satisfied is an attitude of the working unit.

3. The control device for the construction machine according to claim 2 , further comprising:

a control starting angle data acquisition unit configured to acquire bucket control starting angle data indicating an attitude of the working unit when the bucket control conditions are determined to be satisfied,

wherein the working unit control unit outputs a control signal for controlling an angle of the bucket to maintain, at the bucket control starting angle, the attitude of the working unit when the bucket control conditions are satisfied.

4. The control device for the construction machine according to claim 1 , wherein when the bucket control conditions are determined not to be satisfied, the working unit is driven on the basis of operation of the operation device.

5. The control device for the construction machine according to claim 1 , further comprising:

a working unit target speed determination unit configured to determine a speed limit of the working unit on the basis of the distance,

wherein when the distance between the bucket and the target excavation profile is determined to be not larger than a second threshold which is larger than the first threshold, the working unit control unit outputs a control signal for controlling the boom to move the working unit on the basis of the speed limit.

6. A method of controlling a construction machine including a working unit including at least a bucket, the method of controlling a construction machine comprising:

acquiring operational amount data indicating an operational amount of the working unit;

determining a non-operation state of the bucket on the basis of the operational amount data;

acquiring distance data indicating a distance between the bucket and a target excavation profile;

determining whether bucket control conditions are satisfied, on the basis of determination of the non-operation state; and

outputting a control signal for controlling the bucket to maintain an attitude of the working unit of when the bucket control conditions are determined to be satisfied,

wherein the bucket control conditions include the distance between the bucket and the target excavation profile is not larger than a first threshold, and the arm being driven.