Acoustic detector with start-up control
US5070682A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S56/15
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a forage harvester having an acoustic detector for sensing air-borne sounds produced by the impact of hard foreign objects on the crop feed mechanism of the harvester, a start-up control is provided for inhibiting the detector output during the intervals when the crop feed mechanism is stopped or being brought up to running speed. In forage harvesters having metal detectors for sensing the presence of metal in the crop material, the electromagnetic sensor in the metal detector inherently produces a noise output signal which is dependent on the speed of the crop feed mechanism, and this signal is used to control the inhibiting of the acoustic detector output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.