Hydraulic pump control device for construction machine
US8904777B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2012 |
| Grant date | Dec 9, 2014 |
| Priority date | — |
| Expiry date | Jun 15, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pump control device for a construction machine includes a pump regulator, a pump pressure detector, a travelling operation detector, a working operation detector, and a controller instructing the pump flow rate depending on the pump pressure to the pump regulator. The controller stores first and second P-Q characteristics as a horsepower characteristic and instructs the pump flow rate to the pump regulator, based on the first P-Q characteristic when a travelling operation is detected, and based on the second P-Q characteristic when a working operation is detected. The second P-Q characteristic is equal to the first P-Q characteristic in a low-pressure region while is one giving a low characteristic relatively to the first P-Q characteristic so as to increase a horsepower difference as the pump pressure increases, in intermediate-pressure and high-pressure regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.