Hitch control system
US4979092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Jan 6, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B63/1117
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A hitch control system includes a draft force sensor, a hitch position sensor, an operator command lever, an upper hitch position limit setter, a mixer setter, a drop rate setter and a control unit which generates control signals as a function thereof. The control system includes a first (load) control mode wherein the hitch is controlled as a linear function primarily of sensed draft force and a second control mode wherein the hitch is controlled purely as a non-linear function of sensed hitch position. In the load control mode, a reference position value is used as a set point representing only the lower range of positions of the hitch. Draft force sensitivity and system gain values are derived from the mix setter so that increasing the sensitivity also increases the system gain. The sensitivity value is limited within a predetermined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.