Hydraulic system
US-2019085876-A1 · Mar 21, 2019 · US
Failure diagnosis device
US2019113031A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019113031-A1 |
| Application number | US-201716085767-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 24, 2017 |
| Priority date | Mar 24, 2016 |
| Publication date | Apr 18, 2019 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
The unload circuit includes a pump oil passage that connects between a hydraulic pump and a direction control valve, a tank oil passage that connects between the direction control valve and a hydraulic tank, a pressure compensating flow control valve interposed between the pump oil passage and the tank oil passage, a pilot operated relief valve interposed between the pump oil passage and the tank oil passage, and an unloading solenoid valve interposed in a vent oil passage of the pilot operated relief valve. The failure diagnosis device includes a pressure sensor that measures a pressure of the pump oil passage, and a controller that receives a pressure signal from the pressure sensor. The controller performs failure diagnosis of the unload circuit based on a differential pressure between a first pump oil passage pressure during unloading and a second pump oil passage pressure during on-loading.
First claim
Opening claim text (preview).
1 . A failure diagnosis device for an unload circuit, the unload circuit including a pump oil passage that connects between a hydraulic pump and a direction control valve, a tank oil passage that connects between the direction control valve and a hydraulic tank, a pressure compensating flow control valve interposed between the pump oil passage and the tank oil passage, a pilot operated relief valve interposed between the pump oil passage and the tank oil passage, and an unloading solenoid valve interposed in a vent oil passage of the pilot operated relief valve, the failure diagnosis device comprising: a pressure sensor that measures a pressure of the pump oil passage; and a controller that receives a pressure signal from the pressure sensor, wherein the controller performs failure diagnosis of the unload circuit based on a differential pressure between a first pump oil passage pressure during unloading and a second pump oil passage pressure during on-loading. 2 . The failure diagnosis device according to claim 1 , wherein the controller diagnoses that the unload circuit is failed when the differential pressure is equal to or less than a predetermined value. 3 . The failure diagnosis device according to claim 1 , wherein the controller performs failure diagnosis of the unload circuit on condition that the hydraulic pump starts to be driven. 4 . The failure diagnosis device according to claim 3 , wherein the hydraulic pump is driven via a power take-off (PTO), and the controller performs failure diagnosis of the unload circuit based on a differential pressure between the first pump oil passage pressure after an unloaded state is maintained for a predetermined time and the second pump oil passage pressure after switching to an on-load state after the hydraulic pump starts to be driven.
Assignees
Inventors
Classifications
Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems · CPC title
for controlling the actuating force (F15B11/024 takes precedence) · CPC title
electrical · CPC title
Valve failure · CPC title
Safety devices {, e.g. for preventing overload (E02F9/226 takes precedence)} · CPC title
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Frequently asked questions
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- What does patent US2019113031A1 cover?
- The unload circuit includes a pump oil passage that connects between a hydraulic pump and a direction control valve, a tank oil passage that connects between the direction control valve and a hydraulic tank, a pressure compensating flow control valve interposed between the pump oil passage and the tank oil passage, a pilot operated relief valve interposed between the pump oil passage and the ta…
- Who is the assignee on this patent?
- Tadano Ltd
- What technology area does this patent fall under?
- Primary CPC classification F04B51/00. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Apr 18 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).