Method for controlling an attachment to agricultural tractors
US4878543A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1987 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Apr 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D15/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of controlling an attachment to an agricultural tractor in which the absolute movement of the attachment is determined by a motion sensor mounted thereon and is utilized as a control standard while the relative motion of the attachment with respect to the tractor, influenced by the controller and carried out by a power lift, is determined in such a way that the absolute movement of the attachment becomes zero. This control method achieves that the attachment maintains a constant position in space in spite of the pitch movements of the tractor acting as disturbances. This guarantees an automatic tilling process, for instance a uniform depth of the furrows when plowing. By utilizing superimposed feedbacks of further control standards, such as relative position and motor load, changes in the absolute position of the attachment are possible and overloading of the motor is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.