Electrohydraulic pump load control system
US5253982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Nov 23, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2205/063
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electrohydraulic pump load control system that includes a fluid-cooled integrated electric motor/hydraulic pump for delivering fluid under pressure to an accumulator that stabilizes pump output pressure while accommodating changes in fluid flow. A pressure sensor is coupled to the accumulator to provide an electrical signal as a function of fluid pressure at the accumulator. An electronic controller applies electrical power to the pump motor, and is responsive to the electrical signal from the pressure sensor for terminating application of electrical power to the pump motor when pressure at the accumulator reaches the desired threshold. The electronic motor controller controls both application and termination of electrical power to the motor to energize and de-energize the motor at predetermined rates responsive to pressure differential thresholds at the pressure sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.