Title:
FAILURE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/171022
Kind Code:
A1
Abstract:
Provided is a failure detection device which is capable of automatically detecting failure of a hydraulic pilot circuit following a normal lever operation. The failure detection device is for a pilot circuit provided with: a pilot pressure source; a pilot pressure supply unit for supplying pilot pressure to a control valve which supplies operating pressure to an actuator; a pilot oil path which connects the pilot pressure source and a pilot pressure supply valve; and a pressure control unit which is provided to the pilot oil path, and which controls the pressure in the pilot oil path. The failure detection device is provided with: a pressure sensor which measures the pressure in the pilot oil path at the downstream side of the pressure control unit in the direction in which the pilot pressure is supplied; and a controller which, following the return, to a neutral state, of an operation lever which receives operations for operating the actuator, controls the pressure control unit to sequentially switch the pressure in the pilot oil path, and performs failure diagnosis on the basis of the measurement results of the pressure sensor during said switching.
Inventors:
KAWABUCHI NAOTO
YOSHIDA NAOFUMI
FUKUMORI YASUHIRO
YOSHIDA NAOFUMI
FUKUMORI YASUHIRO
Application Number:
PCT/JP2017/013646
Publication Date:
October 05, 2017
Filing Date:
March 31, 2017
Export Citation:
Assignee:
TADANO LTD (JP)
International Classes:
F15B20/00; F15B11/08
Foreign References:
| JPH10311064A | 1998-11-24 | |||
| JPH0656172U | 1994-08-05 |
Other References:
See also references of EP 3438470A4
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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