Title:
DRIVING CONTROL APPARATUS FOR HYDRAULIC CONSTRUCTION MACHINES
Document Type and Number:
WIPO Patent Application WO/1988/002441
Kind Code:
A1
Abstract:
A driving control apparatus for hydraulic construction machines, which is provided with a motor (1), a hydraulic pump (2; 90) driven by the motor (1), at least one hydraulic actuator (3) driven by the oil discharged from this hydraulic pump (2; 90), a first revolution number setting means (7; 80) including a first operating means (5) for setting the number of revolutions per minute of the motor (1), and a second operating means (8, 9) for controlling the operation of the hydraulic actuator (3). This apparatus is further provided with a second revolution number setting means (20, 24; 60, 61; 81; 84; 85, 87; 92; 93) connected to the second operating means (8) and adapted to output a revolution number control signal, by which the set number of revolutions of the motor (1) is increased, when the displacement of the second operating means (8) has exceeded a predetermined level (X0; X'0), and a revolution number control means (21; 32; 40; 62; 77, 82; 86) which is connected to at least the second revolution number setting means, and which is adapted to make effective the number of revolutions set by the first revolution number setting means (7; 80), in a first region (Z1) in which the displacement of the second operating means (8) is at least not higher than the predetermined level (X0; X'0), and set, in a second region (Z2) in which the displacement of the second operating means (8) is higher than the predetermined level (X0; X'0), the number of revolutions corrected by the revolution number control signal from the second revolution setting means and higher than the number of revolutions set by the first revolution number setting means (7; 80).
Inventors:
TATSUMI AKIRA (JP)
Application Number:
PCT/JP1987/000737
Publication Date:
April 07, 1988
Filing Date:
October 02, 1987
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
E02F9/20; E02F9/22; F02D29/04; F04B49/00; F15B11/00; (IPC1-7): F02D29/04; E02F9/20; E02F9/22; F04B49/00; F15B11/00
Foreign References:
| JPS61126388A | 1986-06-13 | |||
| JPS61200344A | 1986-09-04 |
Other References:
See also references of EP 0287670A1
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