Failure detection system for hydraulic pump
US4489551A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1984 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Jan 18, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/065
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A failure detection system for a hydraulic pump (1) having a displacement volume varying device (1a) and connected to at least one hydraulic actuator (4) to constitute a hydraulic circuit for driving the hydraulic actuator. The system includes means (7a, 7b) for sensing the discharge pressure of the pump, means (6) for detecting the value of shifting of the displacement volume varying device, means (5, 24) for closing the hydraulic circuit to block the flow of a hydraulic fluid through the circuit, starting means (9) for giving a command to start checking on the pump to see if it is normally functioning, and a control unit (2, 23, 28, 29) for performing checking on the pump to see if it is normally functioning. The control unit includes means (S-5, S-5') responsive to the command given by the starting means for giving a command to activate the closing means, data collecting means (S-11) for causing the displacement volume varying device to shift based on information (P.sub.a, P.sub.b and Y) supplied by the pressure sensing means and shifting detecting means until the discharge pressure of the pump becomes at least substantially equal to a predetermined reference pressure (P.sub.r) …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.