System for controlling a hydraulic propulsion drive
US6339928B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H59/72
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A loop flushing arrangement for controlling a closed circuit hydraulic propulsion drive. The variable displacement pump 12 is driven by a combustion engine 11. A flush valve 21 is used to clean and cool the hydraulic fluid in the closed hydraulic circuit. The flush valve is electrically operated and, as a result, permits novel and varied control options. The flush valve is controlled automatically, for example by a digital computer 1 as a function of the vehicle speed, the rotational speed of the combustion engine 11, or the temperature of the hydraulic fluid in the variable displacement pump 12. This results in the flushing procedure only being triggered and carried out if the operating state of the vehicle requires and permits it, i.e. when traveling at high speeds, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.