Abstract: The present invention relates to a method of and an apparatus for preparing travel-course data for an unmanned dump truck which can automatically prepare travel-course data with ease and improve the operability and operating efficiency. To this end, the preparing apparatus comprises a position measuring means (11), for measuring a current position of a loader; a loader controller (13), for transmitting by radio the current position, an automatic guiding mode switch (25), for selecting a mode of automatically traveling the unmanned dump truck to a new loading position; and a course preparing means (24), for preparing new travel-course data based on a new loading position and stored travel-course data by regarding the current position as a new loading position when a mode selection signal is inputted, wherein an automatic travel controller (6) rewrites the stored data as new travel-course data.

Abstract: An apparatus and a method for fleet control when manned and unmanned vehicles travel together, and prevents mutual interference when manned vehicles simultaneously travel with unmanned vehicles on the same traveling course. To this end, in the apparatus, the unmanned vehicle includes an unmanned vehicle position detecting device, an unmanned vehicle transmitter/receiver, and an unmanned vehicle controller. The manned vehicle includes a manned vehicle position detecting device, a manned vehicle transmitter/receiver, a manned vehicle controller), and an alarm device. The manned vehicle controller compares unmanned vehicle position data and manned vehicle position data, and outputs an alarm signal for avoiding the unmanned vehicle when the unmanned vehicle travels ahead of the manned vehicle and the distance up to the unmanned vehicle is shorter than a predetermined value.

Abstract: A collision preventing system for a vehicle has a brake system. The system includes first preview sensor detecting an obstacle in front of the vehicle in a first distal detection zone to produce a first signal indicative of presence of the obstacle and distance between the obstacle and the front end of the vehicle, and a second preview sensor detecting the obstacle in front of the vehicle in a second proximal detection zone to produce a second signal indicative of at least presence of the obstacle. The system further includes third vehicle speed sensor detecting vehicular traveling speed and generating a vehicle speed indicative signal. A control unit is connected to the first and second preview sensor for receiving the first and second signals.

Abstract: A steering circuit system for a moving vehicle in which automatic steering operation as well as manual steering operation can be achieved. Pressurized oil discharged from a hydraulic pump (1) is fed to a steering line (3) and to an auxiliary steering line (10). The pressurized oil of the steering line (3) is fed to an expanding chamber (9a, 90a) and to a contracting chamber (9b, 90b) of a pair of steering cylinders (9, 90) by manual operation steering valve (5). The auxiliary steering line (10) is connected to a third line (12) through a switching valve (11). The third line (12) is connected to a fourth line and to a fifth line (14, 15) through an automatic operation steering valve (13). The fourth line (14) is connected to contracting chamber (9b) and to expanding chamber (90a) of the left and right steering cylinders (9, 90). The fifth line (15) is connected to contracting chamber (90b ) and expanding chamber (9a) of the left and right steering cylinders (9, 90).