Electrically powered hydraulic system and a method for controlling an electrically powered hydraulic system
US11566400B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2018 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Mar 19, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/2278
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electrically powered hydraulic system for a working machine includes: an electric motor to power a working hydraulic pump. A flow of hydraulic fluid generated by the hydraulic pump is controlled by the operation rotational speed of the electric motor. An electronic control unit is configured to: when an operator input device is in a first operating range, maintain the electric motor at a constant rotational speed, and control a variation in flow of hydraulic fluid to the hydraulic function with an electronically controlled control valve, and when the operator input device is in a second operating range, control a variation in flow of hydraulic fluid by varying the electric motor rotational speed and by controlling the control valve, according to displacement of the operator input device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.