Apparatus for controlling hydraulic pumps for construction machine
US5176504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1992 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jan 17, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2207/041
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for controlling hydraulic pumps for a construction machine wherein the construction machine includes first and second hydraulic pumps adapted to be driven by an engine and hydraulic actuators hydraulically connected to the first and second hydraulic pumps via first and second actuating valves is disclosed. A controlling section calculates extra horse powers .DELTA.HP.sub.1 and .DELTA.HP.sub.2 based on reference allowable absorptive horse powers set relative to the first and second hydraulic pumps and actual absorptive horse powers (HP.sub.01) and (HP.sub.02) derived from the first and second hydraulic pumps. In addition, the controlling section calculates allowable discharge capacities (V.sub.1P) and (V.sub.2P) based on the number (N) of revolutions of the engines, pressures (P.sub.1) and (P.sub.2) of hydraulic oils discharged from the first and second hydraulic pumps, the extra horse powers .DELTA.HP.sub.1 and .DELTA.HP.sub.2 and allowable discharge capacities (V.sub.1P) and (V.sub.2P). Then, the controlling section selects a smaller one of a target discharge capacity and the allowable discharge capacity (V.sub.1P) and a smaller one of another target discharge capacit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.