Abstract: In order to reduce hysteresis and other noise components included in the output signal characteristic of a differential pressure sensor, an elastic reaction member which operates together with a diaphragm provided in a chamber of the differential pressure sensor includes a contact portion which contacts the diaphragm, and a plurality of springs which are arranged symmetrically about the contact portion. Each of the springs is a plate shaped or linear shaped spring which is bent into the form of a letter C, U, J, or V, and has one of its ends fixed to a wall which defines the chamber, while its other end is connected to the contact portion. When the contact portion shifts together with the diaphragm, the deformations of the plurality of springs are mutually balanced, so that rotation and horizontal deviation of the contact portion with respect to the diaphragm is suppressed.

Abstract: A cylinder stroke position measurement device for enabling common use of a rotation sensor unit in measurement of a cylinder stroke position by detecting an amount of rotation of a rotary roller by means of a rotation sensor. A cylinder is provided at its head portion with a base member 300 having an opening accommodating at least a rotary roller and a rotation sensor section. A pressing member, the rotary roller, and the rotation sensor section are held on one side of a sensor holding member, while a coupling member for example is provided on the opposite side of the sensor holding member, thus constituting a rotation sensor unit. The sensor holding member is attached to the base member such that the rotary roller and the rotation sensor section rare accommodated in the opening of the base member 300. The rotary roller is pressed by the pressing member against the surface of a rod. The rotation sensor section detects an amount of rotation of the rotary roller.

Abstract: A construction target indicator device 30 presents information to the operator of a construction machine 1 in order to facilitate the operation thereof. In the construction target indicator device 30, a laser distance measurement device 20 disposed in the operator's cabin of the construction machine 1 automatically measures the real-time positions of a construction surface 15, reference markers 17 and a bucket 6. A calculation device 32 calculates the cross-sectional shapes of the construction surface 15 and the bucket 6, calculates a virtual line corresponding to a target sloped surface, and creates an image which depicts the cross-sectional shapes of a construction surface 15 and a bucket 6, and a virtual line. The display device 34 displays this image on the display screen. The operator is able to perform accurate excavation work by moving the bucket 6 in line with the virtual line on the display image.

Abstract: In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharge pressure 122, oil temperature 126, and drain filter differential pressure 120 are measured, a correlative relationship 128 between the filter differential pressure and the discharge pressure is determined, and a representative filter differential pressure 130 is calculated from this correlative relationship. Using an oil temperature-differential pressure correlation function, the representative differential pressure value 130 is corrected so that the variable component 132 caused by the oil temperature 126 is eliminated therefrom. The long-term trend and the short-term trend of the increase over time of the corrected differential pressure is calculated. A pump failure is predicted or the pump lifespan is estimated based on the degree of deviation between the long-term trend and the short-term trend.

Abstract: In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharge pressure 122, oil temperature 126, and drain filter differential pressure 120 are measured, a correlative relationship 128 between the filter differential pressure and the discharge pressure is determined, and a representative filter differential pressure 130 is calculated from this correlative relationship. Using an oil temperature-differential pressure correlation function, the representative differential pressure value 130 is corrected so that the variable component 132 caused by the oil temperature 126 is eliminated therefrom. The long-term trend and the short-term trend of the increase over time of the corrected differential pressure is calculated. A pump failure is predicted or the pump lifespan is estimated based on the degree of deviation between the long-term trend and the short-term trend.

Abstract: The present invention allows simple setting of the operating environment that is required when the access destination of the mobile communications terminal is altered. The mobile communications terminal mounted on the construction machinery has a satellite communications terminal and a wireless LAN terminal. When the construction machinery is disposed on a new construction site, the mobile communications terminal sends operating environment setting requests and position information from the satellite communications terminal to the control server. In response to these requests, the control server selects operating environment setting data for the wireless LAN of the construction site on the basis of the received position information, and sends this data to the satellite communications terminal of the mobile communications terminal. The mobile communications terminal automatically sets the operating environment of the wireless LAN-terminal on the basis of the received setting data.

Abstract: There is provided a vehicle interference prevention device that, by computing a range of possible locations of a vehicle taking into consideration the time at which the location of the vehicle is measured, can safely predict the location of the vehicle, even with minimal frequency of radio contact, and prevent interference among unmanned vehicles or manned vehicles over the entirety of large work site. An unmanned vehicle uses the latest position data for a manned vehicle acquired (received) via an inter-vehicle communication device to determine a position (position at a certain point in time) as the basis for computing a circle having this position as its center and having a radius equal to the distance traveled at maximum speed from this point to a predetermined future point in time, and designates the area within this circle on a prearranged travel route as a range of possible locations for the manned vehicle. The unmanned vehicle then decides whether its own vehicle position interferes with this circle.

Abstract: Data sharing equipment for mobile stations is described, which is capable of suppressing a load upon a communication line for data communication between a monitor station and the mobile stations and reducing a standby time required for the data communication of the mobile stations. It is assumed that excavators and trucks have received all course data C1 to C3 and courses ID1 to ID3, and truck 11 has received only the course data C1, C2 and the course ID1, ID2. When an excavator moves from present course 2 to a location to adopt course 3, and when a truck arrives at a loading spot and the excavator and the truck can communicate by spread-spectrum radio communications, the excavator transmits the course ID3 as the instruction content to the truck by the spread-spectrum radio communication.

Abstract: There is provided a vehicle interference prevention device that, by computing a range of possible locations of a vehicle taking into consideration the time at which the location of the vehicle is measured, can safely predict the location of the vehicle, even with minimal frequency of radio contact, and prevent interference among unmanned vehicles or manned vehicles over the entirety of large work site. An unmanned vehicle uses the latest position data for a manned vehicle acquired (received) via an inter-vehicle communication device to determine a position (position at a certain point in time) as the basis for computing a circle having this position as its center and having a radius equal to the distance traveled at maximum speed from this point to a predetermined future point in time, and designates the area within this circle on a prearranged travel route as a range of possible locations for the manned vehicle. The unmanned vehicle then decides whether its own vehicle position interferes with this circle.

Abstract: If an obstacle (74) is detected, its position is stored in obstacle memory unit (41) on the assumption that the obstacle (74) is common to a plurality of vehicles (2, 2). As vehicles (2, 2) pass by, the content of the obstacle memory unit (44) is updated. When the vehicles (2, 2) are supplied with position data of the respective goal point (72, 72), the vehicles (2, 2) are guided by their goal point (72, 72) in accordance with the content of the obstacle memory unit (41) so that they can avoid the obstacle (74). Vehicles can be thus guided to avoid obstacles by knowing the existence of obstacles in the working sites where the positions of obstacles are always different.

Abstract: Position data of target points (26′, 26′, . . . ) in a target area (21) is generated based on the position data of the target area (21) (position data of a borderline (20)) inputted to area data input device (3). A vehicle (13) is sequentially guided to travel through the target positions (26′, 26′, . . . ) in the target area (21) while being given the position data of the target points (26′, 26′, . . . ). Not by a conventional method such as a teaching method, a travel course to target points in a target area is easily created with little man-hour in a short time when an earth unloading area (target area) which the vehicle is to reach is given, thereby enhancing the work efficiency of creating a travel course. Further, target earth unloading points in an earth unloading area are arranged uniformly and densely, and consequently the efficiencies of an earth unloading work and a leveling work are enhanced.

Abstract: Working efficiency is improved without wasted activity of vehicles by enabling prompt change of a travel route at a time when it becomes necessary to change the travel route of a vehicle. A monitor station changes a worksite towards which a vehicle should travel from a worksite 60a to a worksite 60a′ on the basis of a result of monitoring current positions of a plurality of vehicles and current status of a plurality of worksites. At the same time, the monitor station provides data for the travel route from the current positions of the vehicles to the changed worksite 60a to the vehicles. Upon receiving the data for the travel route from the monitor station, the vehicles then travel along the travel route from their current positions to the changed worksite 60a′.

Abstract: To enable vehicles to travel safely without risk of head-on collision when they have been made to travel on an oncoming lane in order to avoid an obstacle on the original lane. In addition, when travel conditions have been set or changed, it becomes possible to transmit data quickly but a problem of a production efficiency being reduced as a result of all the vehicles being stopped does not arise nor is there a safety problem due to a delay in data changes. On the basis of a monitored result of the travel conditions of the travel track, a no-entry area E is established ahead of a vehicle Jm traveling on one lane of a 2-way dual-lane vehicle track. Then travel instructions are issued to the vehicle Jm, the travel instructions causing it to avoid the no-entry area and travel on a section L of an oncoming lane, a lane whose traffic runs in the opposite direction to the one lane. Travel instructions are issued to an oncoming vehicle Jt traveling on the oncoming lane which prohibits entry to the section L.

Abstract: There is provided a vehicle interference prevention device that, by computing a range of possible locations of a vehicle taking into consideration the time at which the location of the vehicle is measured, can safely predict the location of the vehicle, even with minimal frequency of radio contact, and prevent interference among unmanned vehicles or manned vehicles over the entirety of large work site. An unmanned vehicle uses the latest position data for a manned vehicle acquired (received) via an intervehicle communication device to determine a position (position at a certain point in time) as the basis for computing a circle having this position as its center and having a radius equal to the distance traveled at maximum speed from this point to a predetermined future point in time, and designates the area within this circle on a prearranged travel route as a range of possible locations for the manned vehicle. The unmanned vehicle then decides whether its own vehicle position interferes with this circle.

Abstract: A automatic traveling vehicle that may travel at high speed along a predetermined course without colliding or interfering with detected objects within the course. The vehicle radiates a directional medium and analyzes any reflections to determined the presence of objects along the course. The vehicle combines predetermined, stored information with currently detected information to ensure the farthest possible distance for object detection and increased reliability for preventing collision and interference with detected objects.

Abstract: A speed controller for a self-traveling vehicle, capable of traveling at high speed along curves, downhill roads, and uphill roads without colliding with an object detected by an object detecting means, is provided.

Abstract: There is provided a vehicle interference prevention device that, by computing a range of possible locations of a vehicle taking into consideration the time at which the location of the vehicle is measured, can safely predict the location of the vehicle, even with minimal frequency of radio contact, and prevent interference among unmanned vehicles or manned vehicles over the entirety of large work site, An unmanned vehicle uses the latest position data for a manned vehicle acquired (received) via an inter-vehicle communication device to determine a position (position at a certain point in time) as the basis for computing a circle having this position as its center and having a radius equal to the distance traveled at maximum speed from this point to a predetermined future point in time, and designates the area within this circle on a prearranged travel route as a range of possible locations for the manned vehicle. The unmanned vehicle then decides whether its own vehicle position interferes with this circle.

Abstract: The present invention prevents the interference of vehicles traveling on-coming to each other when a plurality of vehicles are traveling on-coming to each other on a traveling path with a predetermined road width without increase in cost caused by setting a wide course width and without a drop in work efficiency caused by decreasing velocity. If one of the vehicles detects the other vehicle by its obstacle detection means when the vehicles are traveling on-coming to each other, the vehicle which detects the other vehicle begins deceleration to stop itself. At the same time, this vehicle transmits a deceleration control command for stopping the other vehicle to the other vehicle via transmission/reception means, therefore the other vehicle starts deceleration even if this vehicle cannot detect an obstacle.

Abstract: Interference prediction apparatus is applied when an unmanned vehicle is guided within a course area based on travel position and course data, and comprises a device for inputting the form of the course area, a device for preparing course data, device for estimating error of travel position when the unmanned vehicle is operated according to course data, and a device for predicting interference between the unmanned vehicle and areas outside the course area on the basis of estimated error so that interference can be prevented when unmanned vehicles pass by each other.

Abstract: This invention is a vehicle monitor for avoiding interference between vehicles, etc., without incurring cost increases for deploying auxiliary equipment at a wide-area site, while imposing only low loads on communication lines and monitoring stations, without impairing safety, and while realizing high flexibility for modifications of planned travelling paths. This system can also cope with various forms of interference which can occur throughout the entire planned travelling paths. In the system of the present invention, transceiver devices are provided in the monitoring station and in a plurality of vehicles, respectively, for sending and receiving position data and directive data between the monitoring station and the plurality of vehicles, using a communication system wherewith radio-communication is possible over the distances between the monitoring station and the plurality of vehicles.