Title:
建設機械
Document Type and Number:
Japanese Patent JP6654521
Kind Code:
B2
Abstract:
Provided is a construction machine capable of detecting a stuck-open state of a surplus flow control valve in real time during operation without involving a reduction in the operational speed. The construction machine is equipped with: a surplus flow control valve control section configured to output a closing command to a first surplus flow control valve at the operation start when an operation amount signal of an operation lever device is detected; a pump delivery control section configured to output a delivery flow rate command to an adjustment section of an open circuit pump; an assist valve control section configured to continue to output a closing command from before to an assist valve; a sticking detection determination section configured to compare a pressure signal with a previously set threshold value and determining that the surplus flow control valve is in a stuck-open state when the pressure signal is less than the threshold value and determining that the surplus flow control valve is normal when the pressure signal exceeds the threshold value; and a stop signal generating section configured to input therein a sticking determination signal, output in the case of a stuck-open state a control signal maintaining a closed state of the assist valve to the assist valve control section, and output in the case of a normal state a control signal causing the assist valve to perform an opening operation to the assist valve control section.
Inventors:
Teppei Saito
Shimizu Freedom
Kenji Hirai
Hiromasa Takahashi
Cedar Kihei Shohei
Shimizu Freedom
Kenji Hirai
Hiromasa Takahashi
Cedar Kihei Shohei
Application Number:
JP2016140046A
Publication Date:
February 26, 2020
Filing Date:
July 15, 2016
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F15B20/00; E02F9/22; E02F9/24; F15B11/02; F15B11/08
Domestic Patent References:
| JP201548899A | ||||
| JP2008291962A | ||||
| JP2009121649A | ||||
| JP201635321A |
Attorney, Agent or Firm:
Kaichi International Patent Office