CONTROL METHOD AND DEVICE FOR CONSTRUCTION MACHINERY

Japanese Patent JP3827844

B2

PROBLEM TO BE SOLVED: To prevent engine stall in a costless equipment constitution without decreasing a fuel efficiency by controlling a working machine so that the delivery volume of a variable capacity type hydraulic pump for steering is reduced and a load distribution for the revolution of the vehicle is reduced, when a load acting on the working machine exceeds a preset value.
SOLUTION: A hydraulic pump 22 for a working machine is driven by the output power of an engine 20 to actuate a bulldozer as a working machine, and a variable capacity type hydraulic pump 23 for steering is driven by the output power of the engine 20 to adjust the traveling speed of the right and left caterpillars and revolve the vehicle. A load acting on the working machine is detected on the basis of the delivery pressure of the hydraulic pump 22 for the working machine detected by a hydraulic pressure sensor 46 and the revolution number of the engine detected by an engine-revolution sensor 49. And when it is judged that a detected load exceeds a preset value, the device is controlled so as to reduce the delivery volume of the hydraulic pump 23 for steering and reduce a load distribution for revolution of the vehicle.

JPS58530

[Title of the Invention] A blade device in construction machinery

Toshihiko Fukasawa
Shigeru Yamamoto
Hisao Asada
Yasuo Fujiwara
Tomohiro Nakagawa

JP35038697A

September 27, 2006

December 19, 1997

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KOMATSU LTD.

E02F3/84; E02F9/22; F04B49/00; (IPC1-7): E02F3/84; F04B49/00

JP4027669A
JP4063975A
JP7259140A
JP48018047B1

Tsutomu Inoue

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