Abstract: The present disclosure provides an electronic control device capable of suppressing variations in the position of a work machine calculated based on satellite signals received by a GNSS terminal due to changes in the GNSS communication environment, and eliminating the position error after improvement of the communication environment in a shorter time than before. The electronic control device includes: a positioning quality determination section 211 that determines whether the positioning quality is good or poor based on GNSS information; a traveling state determination section 212 that determines the traveling state, including a stop state, based on the velocity of the work machine; and a smoothing section 213 that performs smoothing processing to the GNSS information.

Abstract: A sensor interface circuit includes: an RF switch having a control node; a bias circuit electrically connected to the control node and applying, to the control node, a voltage at a first level or a second level corresponding to a linear region of a reflection characteristic; a first variable oscillation circuit electrically connectable to a first sensor; a second variable oscillation circuit electrically connectable to a second sensor; and a difference circuit electrically connected between the first variable oscillation circuit and the bias circuit, and between the second variable oscillation circuit and the bias circuit.

Abstract: A construction machine includes an angle measuring apparatus that sense acceleration and angular velocities of installation portions on a machine body and a work implement and that compute angles of the installation portions relative to a reference plane based on sensing results, and a controller that executes operation assistance of a work implement based on postural information on the machine body and the work implement computed on the basis of the angles from the angle measuring apparatus.

Abstract: A controller provided to a work machine stores a plurality of mask ranges which are used to select positioning satellites to be used by a receiver to compute a position of an antenna and are set with reference to an antenna on the basis of the postures of a work device and an swing structure. The controller computes each of a plurality of positioning precisions on the basis of satellite related data on the positioning satellites each of which is selected through use of each of the plurality of mask ranges and satellite related data on the positioning satellites which are selected through use of none of the plurality of mask ranges. The receiver computes the position of the antenna on the basis of satellite signals of the positioning satellites selected in a case of having the highest positioning precision out of the plurality of computed positioning precisions.

Abstract: Upon determining that the work apparatus will not enter a prohibited area set on the basis of output of a second position calculator of a carrier, the system computes, on the basis of the result of a prediction computation, first input of the dynamic characteristic with which a distal end of the work apparatus approaches a target position set on the basis of the output of the second position calculator. Upon determining that the work apparatus will enter the prohibited area, the system computes second input of the dynamic characteristic with which the distal end targets and approaches a position that is closer to the target position than the position of the distal end of the work apparatus at a position different from the target position outside the prohibited area, and the system computes control input for controlling the operation of the loader.

Abstract: A construction machine includes: a work device attached to a machine body in a raiseable and lowerable manner; an antenna that is attached to the machine body and receives positioning signals from satellites; a machine body IMU that senses information on a posture and motion of the machine body; an IMU that senses information on a posture of the work device; and a computing device that computes posture information indicating the postures of the machine body and the work device. The computing device performs positioning computation to compute a position of the machine body and a variance value thereof based on the positioning signals received by the antenna, subjects the position as a result of the positioning computation to first smoothing processing that is to increase a degree of smoothing as the variance value as a result of the positioning computation becomes larger, and computes the posture information.

Abstract: A construction machine that can make a depressing force of a bucket during compaction work to be uniform without requiring an operator to perform a complicated operation is provided. A controller 18 determines whether or not compaction work is in progress, calculates a front distance R that represents a distance between a rotational pivot of a boom 4 and a predetermined position B in a back surface of a bucket 6, determines a target velocity of the bucket such that a velocity with which the bucket approaches a leveling target surface decreases with increasing values of the front distance, and, during the compaction work, notifies the operator of details of an operation of operation devices 9a and 9b for achieving the target velocity of the bucket or controls hydraulic actuators 4a to 6a so as to achieve the target velocity of the bucket.

Abstract: A hydraulic excavator including a controller that calculates the positional relationship between a bucket and a target surface and a display device that displays the positional relationship between the bucket and the target surface includes an actuator state sensor that detects the pressure of a hydraulic cylinder. The controller calculates the velocity of the bucket based on the position of a work implement and the operation amount of an operation device and changes the contents of informing by the display device according to the velocity of the bucket, the distance between the bucket and the target surface, and the pressure of the hydraulic cylinder. The display device displays the contents of informing changed by the controller.

Abstract: A navigation planning method and apparatus comprising a chart data receiving terminal configured to receive a chart data including position information of one or a plurality of targets; a waypoint receiving terminal configured to receive a plurality of waypoints including a latest waypoint for a navigation route of a movable body; a potential waypoint receiving terminal configured to receive a potential waypoint being movable on the chart; and processing circuitry configured to: determine a position of the potential waypoint as a next waypoint following the latest waypoint, the potential waypoint being movable, wherein the potential waypoint is determined by: receive a current position data of the potential waypoint; receive position information of the plurality of targets located within a predetermined distance from the current position of the potential waypoint; calculate an angle between a first bar and a second bar on the chart, wherein the first bar is to connect the latest waypoint with the potential wa

Abstract: The combustor for a rocket engine includes a combustion room configured to cause a combustion reaction between a fuel and an oxidant, an injector configured to inject the fuel and the oxidant into the combustion room, and a nozzle skirt configured to inject combustion gas generated by the combustion reaction to an outside, and an inertance increasing portion configured to increase an equivalent inertance in a vibration equivalent circuit of the combustor for the rocket engine.

Abstract: A controller sets, as a satellite mask range, a range for which a work implement can become an obstacle when an antenna receives positioning signals from a plurality of positioning satellites on the basis of a position at which the antenna is installed, a movable range of the work implement, a posture of an upper swing structure, and an azimuth angle of the upper swing structure. The controller cancels the setting of the satellite mask range in a case where it has been determined, on the basis of satellite positioning condition data acquired from a receiver, that the setting of the satellite mask range leads to reduced precision of positioning computation by the receiver. In a case where the setting of the satellite mask range has been canceled, the receiver computes the position of the upper swing structure on the basis of the positioning signals transmitted from the plurality of positioning satellites.

Abstract: A position/posture computing section determines that an azimuth of an upper swing structure calculated at a GNSS receiver is of low quality when at least one of a posture angle of the upper swing structure acquired at a machine-body IMU and a posture angle of a front work implement acquired at a boom IMU is equal to or larger than a threshold value, executes a bias removal computation on the basis of the quality of the azimuth and the azimuth of the upper swing structure calculated at the GNSS receiver, calculates a corrected azimuth of the upper swing structure on the basis of the azimuth of the upper swing structure calculated at the GNSS receiver, and an angular velocity of the upper swing structure from which a gyro bias has been removed, and computes a three-dimensional position and posture of the front work implement by using the corrected azimuth.

Abstract: An installation error of a machine-body inertial measurement unit around a first axis is computed on a basis of sensing results of inertial measurement units of a front work implement, and the machine-body inertial measurement unit obtained while the upper swing structure is in a first calibration posture in which the upper swing structure faces a predetermined direction relative to a lower travel structure; and an installation error of the machine-body inertial measurement unit around a second axis is computed on a basis of a sensing result of the machine-body inertial measurement unit obtained while the upper swing structure is in a second calibration posture in which the upper swing structure is swung by 90 degrees relative to the lower travel structure from the first calibration posture, and the installation error of the machine-body inertial measurement unit around the first axis.

Abstract: A hydraulic excavator includes: a multijoint type front implement that is configured by coupling a plurality of driven members including a bucket; inertial measurement units that detect posture information about the plurality of driven members; and a calibration value computing section that computes calibration parameters used in calibration of detection results of the inertial measurement units; and a work position computing section that computes a relative position of the bucket to the machine body on the basis of the detection results of the inertial measurement units and the computation result of the calibration value computing section, and the calibration value computing section computes the calibration parameters on the basis of the detection results of the inertial measurement units in a plurality of postures of the front implement in which a reference point set on any of the plurality of driven members in advance matches a reference position.

Abstract: A hydraulic excavator including a controller that calculates the positional relationship between a bucket and a target surface and a display device that displays the positional relationship between the bucket and the target surface includes an actuator state sensor that detects the pressure of a hydraulic cylinder. The controller calculates the velocity of the bucket based on the position of a work implement and the operation amount of an operation device and changes the contents of informing by the display device according to the velocity of the bucket, the distance between the bucket and the target surface, and the pressure of the hydraulic cylinder. The display device displays the contents of informing changed by the controller.

Abstract: A construction machine that can make a depressing force of a bucket during compaction work to be uniform without requiring an operator to perform a complicated operation is provided. A controller 18 determines whether or not compaction work is in progress, calculates a front distance R that represents a distance between a rotational pivot of a boom 4 and a predetermined position B in a back surface of a bucket 6, determines a target velocity of the bucket such that a velocity with which the bucket approaches a leveling target surface decreases with increasing values of the front distance, and, during the compaction work, notifies the operator of details of an operation of operation devices 9a and 9b for achieving the target velocity of the bucket or controls hydraulic actuators 4a to 6a so as to achieve the target velocity of the bucket.

Abstract: A construction machine capable of achieving favorable operability in a combined operation is provided. A hybrid excavator includes: a boom cylinder 10 driven by hydraulic fluid from a hydraulic pump 16b; a swing hydraulic motor 5 driven by hydraulic fluid from the hydraulic pump 16b; a swing electric motor 6 connected mechanically with the swing hydraulic motor 5; an inverter 19 that controls operation of the swing electric motor 6; and a controller 21 that outputs to the inverter 19 a torque command value for controlling electric driving torque or electricity generating torque of the swing electric motor 6.

Abstract: The first engine speed or a work machine is higher than the minimum engine speed, and the second engine speed is higher than the first engine speed and lower than the maximum engine speed. The ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the minimum speed to the operation amount for instructing the first engine speed is larger than the ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the second engine speed to the operation amount for instructing the maximum speed.

Abstract: A control apparatus for a hybrid construction machine includes an engine, a motor generator driven by the engine and capable of generating electric power, a hydraulic pump driven by total torque of the engine and the motor generator, a power storage device, an inverter, a filter that collects a particulate material in exhaust gas of the engine, and a control section outputting a command signal for controlling powering operation or regeneration operation of the motor generator. The control apparatus further includes a powering operation limitation section that inputs thereto an ordinary torque command calculated by a torque command value calculation section and a demand signal for regeneration of the filter decided by a filter regeneration decision section and calculates the command signal in response to the input signals. When a filter regeneration demand signal is available, a command signal for limiting the powering operation of the motor generator is calculated.

Abstract: An object of the present invention is to provide a working machine and a working machine monitoring system using the same which is capable of improving the accuracy in determining fuel property. The working machine is provided with an engine operation parameter acquisition module (1041) that acquires an engine operation parameter representing the operation state of an engine mounted on the working machine; a refueling time acquisition module (1011) that acquires a refueling time when the working machine is supplied with fuel; and a fuel property determination module (1014) that determines the property of the fuel based on a comparison result of the time when the engine operation parameter changes, with the refueling time.