Abnormal discharge detection device and abnormal discharge detection method
US10385844B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2017 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Jan 5, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2233/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump included in an oil supply unit includes a piezoelectric body that is repeatedly deformed when a pulsed drive voltage is applied from a drive unit. The pump discharges lubricant as the volume of a storage unit that stores fluid to be supplied decreases with deformation of the piezoelectric body. An abnormal discharge detection device that detects an abnormal fluid discharge operation of the pump includes: a measurement unit that measures a terminal voltage of the piezoelectric body; and a control unit functioning as a determination unit that determines if the discharge operation is being performed normally or not based on whether or not the measured terminal voltage has changed with time during application of a pulse of the drive voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.