Title:
故障検知装置
Document Type and Number:
Japanese Patent JP6816764
Kind Code:
B2
Abstract:
Provided is a failure detection device which is capable of automatically detecting a failure of a hydraulic pilot circuit following a normal lever operation. The failure detection device is a failure detection device of a pilot circuit, the pilot circuit including: a pilot pressure source; a pilot pressure supply unit that supplies pilot pressure to a control valve that supplies operating pressure to an actuator; a pilot oil path that connects the pilot pressure source and a pilot pressure supply unit; and a pressure control unit that is disposed in the pilot oil path to control a pressure of the pilot oil path, the failure detection device including: a pressure sensor that measures the pressure on a downstream side in a pilot pressure supply direction of the pressure control unit in the pilot oil path; and a controller that controls the pressure control unit to sequentially switch the pressure of the pilot oil path and performs a failure diagnosis based on a measurement result of the pressure sensor at this time, as an operation lever which receives an operation for operating the actuator returns to a neutral state.
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Inventors:
Naoto Kawabuchi
Takashi Yoshida
Fukumori Yasuhiro
Takashi Yoshida
Fukumori Yasuhiro
Application Number:
JP2018509666A
Publication Date:
January 20, 2021
Filing Date:
March 31, 2017
Export Citation:
Assignee:
Tadano Co., Ltd.
International Classes:
F15B20/00
Domestic Patent References:
| JP10311064A | ||||
| JP6056172U | ||||
| JP2008215420A |
Attorney, Agent or Firm:
Washeda International Patent Office