Abstract:
The invention relates to a method for controlling movements of a work vehicle, wherein a state of an equipment for handling objects or material is determined and that at least one operating parameter of a driveline of the vehicle is controlled depending on the determined equipment state.
Abstract:
A hydraulic control circuit of a boom cylinder (8) capable of improving a fuel consumption, increasing a working efficiency in combined operation, and increasing the workability and operability of the works requiring a difficult boom operation such as rubble scraping operation and top soil placing operation when pressure oil is controllably supplied to and discharged from the boom cylinder, comprising a selector valve (22) for holding a first boom section control valve (14) at a neutral position (N), a communication oil path (E) for communicating a head side oil chamber (8a) with a rod side oil chamber (8b), a stop valve (21) for opening and closing the communication oil path, a pilot operated check valve (23) switchable between a one-way mode for allowing an oil flow from the head side oil chamber to the rod side oil chamber but stopping an oil flow in reverse direction and a two-way mode for allowing an oil flow in both directions, and a discharge means for flowing the discharged oil from the head side oil chamber (8a) to an oil tank (13) provided in a second boom section control valve (15).
Abstract:
A hydraulic circuit (101) of an excavating and slewing working vehicle of two pump system, wherein a directional control valve for slewing (54) and a directional control valve for arm (55) are tandem-connected to the upstream side and downstream side of the delivery oil passage (32) of a second hydraulic pump (P2), respectively, a directional control valve for boom (51) and a directional control valve for bucket (52) are connected to the delivery oil passage (31) of a first hydraulic pump (P1), and then a bleed switching valve (85) connected, through a check valve (68), to the delivery oil passage (32) of the second hydraulic pump (P2) between the directional control valve for swing (54) and the directional control valve for arm (55) and switched to connect to or disconnect from a tank on the upstream side of the check valve (68) and the directional control valve for slewing (54) are operated interlockingly with each other.