Shin Caterpillar Mitsubishi Ltd.

Caterpillar Japan Ltd.

Tomoaki Ono

Shoji Tozawa

Satoshi Fujii

Hideo Yamada

Isao Murota

Makoto Sakai

Koichi Harada

Masaharu Kamagata

Yasuaki Kakizawa

An indicator control system for switching from a measurement value display mode to a camera display mode and vice versa in order to display a selected mode on a monitor section of an indicator and for generating an alarm from an alarm section. The measurement value display mode shows the measurement data of an object to be monitored such as a construction machine. The camera display mode being for a camera section that is mounted on the construction machine.

Indicator control system for constrution machine

An indicator control system with a camera section provided with a switch for switching from a measurement value display mode to a camera display mode and vice versa to display a selected mode on a monitor section of an indicator. The measurement value display mode shows the measurement data of an object to be monitored on a construction machine, and the camera display mode is for the camera section mounted on the construction machine.

Indicator control system with camera section

A remote management system including a work machine side dynamic state data management device, and a management section side management device for causing a communication unit capable of data transmission and reception to and from a communication unit on the work machine side to receive dynamic state data transmitted from at least the work machine side and at the same time, causing a control section to run a Web site capable of providing data only to a user permitted to access and reflecting arbitrary data out of the received dynamic state data in the Web site.

Remote management system of dynamic state data of work machine

A construction machine (,) with a laser measuring instrument which includes a construction machine body, a working apparatus, and a manually operable member for driving a cylinder apparatus of the working apparatus to operate a plurality of arm members and an end working member is constructed such that it comprises an array type laser receiver (,) mounted on the arm member positioned on the free end side for receiving a laser beam parallel to an aimed floor face irradiated from a laser apparatus (,) disposed at a position spaced away from the construction machine (,): posture detection structure (,-,to,-,) for detecting a posture of the construction machine, and control structure (,) for controlling the working apparatus based on a result of detection by the posture detection structure (,-,to,-,) so that the array type laser receiver (,) may receive the laser beam from the laser apparatus (,) at a predetermined angle. Consequently, the working member can be driven automatically and accurately so that the laser beam may be received at the right angle.

Construction machine with function of measuring finishing accuracy of floor face smoothed thereby

Method and device for controlling construction machine

Control device of construction machine

The finishing precision and uniformity of hardness of a surface finished by a construction machine, such as back-hoe, is improved by modifying the targets of a position-tracking control system based on work-load applied to the end effector of the construction machine. For example, compaction of a surface, contoured by a position-tracking, back-hoe, can be made more uniform. This is accomplished by adjusting actuator targets, otherwise controlled on the basis of positional and speed constraints, in response to a detected work load acting on the end effector. To detect work load, a hydraulic fluid pressure signal can be applied to a computer which generates target position and speed commands to the feedback system. The control circuit may be arranged to hold work load constant (generating a constant compaction force for example) or, in response to a priority signal, the circuit can give a selected weight to both the positional constraints and the work load constraints. Another benefit of altering position-tracking in response to work load is improved coordination of actuators. For example, the gain of feedback and feedforward signals of a position-tracking control system can be increased when a detected load is heavy, increasing response, and attenuated when the load is light.

Apparatus and method for controlling a contruction machine

A load transfer and loading device equipped with a boom, a stick, and a bucket which are pin-coupled to each other for loading a load into the bucket, and transferring and loading it onto a specified position. The load transfer and loading device includes a weighing means for calculating the weight of the load in the bucket from a load applied to a pin coupling the boom to the stick and the position of the boom and the stick in accordance with specified equations.

Load transfer and loading device with weight measurement

A control method and a device to control construction equipment attachments include during manual operation, the pilot pressure discharged from a pilot pump is fed from a manual operation valve through an electromagnetic change valve to a main control valve. During automatic operation, the pilot pressure from an automatic-mode selecting valve is fed through an electromagnetic proportional control valve as well as the electromagnetic change valve, all of which are controlled by a controller, to a main control valve. When the operation range is restrictively set during manual operation, the pilot pressure output from the manual operation valve is fed through the electromagnetic proportional control valve as well as the electromagnetic change valve to the main control valve. Both the main control valve and the electromagnetic proportional control valve are controlled by control signals from the controller. When the equipment attachment approaches the set restriction, the main control valve is returned to a neutral position by the controller causing the electromagnetic proportional control valve to block the pilot pressure.

Device and method for controlling attachment of construction machine

A method and a device to control a bucket actuator, which controls the scooping, carrying, scraping, or digging action of the bucket, automatically switches between a bucket angle-maintaining control mode and a manual operation mode. The bucket angle-maintaining control mode, which automatically maintains a bucket angle, is used when the method determines that excavating is not being performed. The method automatically switches to the manual operation mode when the method determines, from the two parameters of bucket angle and stick movement, that excavating is being performed.

Method and device for controlling bucket angle of hydraulic shovel

An excavator control apparatus for shovel-type construction equipment includes an automatic digging control section, a digging load control device, and an operation command correcting device. The shovel-type construction equipment has a boom, an arm and a bucket that are successively and rotatably connected in an operation section. The boom, the arm and the bucket are each connected to at least one cylinder that extends and retracts according to the operation of a lever. The digging load control device permits an automatic digging routine to be executed by controlling the extension and retraction of the cylinder. The digging load control device transmits operation commands to the cylinder to maintain a digging load approximately equal to a set digging load during automatic digging. The operation command correcting device corrects the operation commands transmitted to the cylinder by manual operation of the lever without cancelling the automatic digging routine.

Excavator control apparatus for shovel-type construction equipment

A valve control unit includes a main hydraulic oil circuit and a pilot oil circuit. The main circuit includes a main pump, a main valve downstream from the main pump, and a hydraulic actuator downstream from the main valve. The pilot oil circuit circulates pressurized pilot oil to control the main valve and includes a pilot oil pump, an automatic control switching valve downstream from the pilot oil pump, a manual limit switching valve downstream from the pilot oil pump, a manual control switching valve downstream from the manual limit switching valve, and a pilot oil chamber downstream from the manual control switching valve. The pilot oil chamber is located near the main valve such that the flow of pressurized pilot oil moves the main valve.

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Tokyo, Japan

Tomoaki Ono