Invention Grant
- Patent Title: Construction machine
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Application No.: US16084882Application Date: 2017-06-26
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Publication No.: US10677272B2Publication Date: 2020-06-09
- Inventor: Teppei Saitoh , Juri Shimizu , Kenji Hiraku , Hiromasa Takahashi , Shouhei Sugiki
- Applicant: Hitachi Construction Machinery Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@29c0a54e
- International Application: PCT/JP2017/023416 WO 20170626
- International Announcement: WO2018/012264 WO 20180118
- Main IPC: F15B20/00
- IPC: F15B20/00 ; E02F9/24 ; F15B11/02 ; F15B11/08 ; E02F9/22

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.
Public/Granted literature
- US20190078594A1 Construction Machine Public/Granted day:2019-03-14
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