Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1998-10-01
1999-08-03
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60431, F16D 3102
Patent
active
059309962
ABSTRACT:
In the arm-crowding or track operation, a calculating portion (700d2 or 700d4) calculates a modification gain (KAC or KTR) depending on an operation pilot pressure and a calculating portion (700g) calculates a decrease modification (DND) based on the KAC or KTR, while a calculating portion (700m or 700p) calculates a modification gain (KACH or KTRH) depending on an operation pilot pressure and calculating portions (700q-700s) calculate an increase modification (DNH) based on the KACH or KTRH. A reference target engine revolution speed NR0 is modified using the DND and DNH. In other operations than the arm-crowding and track operations, NR0 is modified using only the decrease modification (DND) calculated from the modification gain just depending on the operation pilot pressure. In the operation where an engine revolution speed is desired to become higher as an actuator load increases, the engine revolution speed can be controlled in accordance with change of the actuator load as well. In other operations, the engine revolution speed can be controlled just depending on the direction and input amount in and by which corresponding operation instructing apparatus is operated.
REFERENCES:
patent: 4967557 (1990-11-01), Izumi et al.
patent: 5295353 (1994-03-01), Ikari
patent: 5303551 (1994-04-01), Lee
patent: 5406793 (1995-04-01), Maruyama et al.
Hirata Toichi
Ishikawa Kouji
Kowatari Yoichi
Nakamura Kazunori
Nakamura Tsuyoshi
Hitachi Construction Machinery Co. Ltd.
Nguyen Hoang
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