Environmental control for tractor cab
US4467706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Mar 8, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An environmental control system for an enclosed cab of an off-the-road vehicle such as a tractor includes a pressurization blower for pressurizing the cab to a positive pressure with respect to atmospheric pressure outside the cab, and a recirculation blower for recirculating air within the cab. The system includes a fresh air intake for taking in air from outside the cab, a recirculation air intake for taking in air from within the cab, and outlets through which the air from the blowers enters the cab. An air precleaner and a fresh air filter are provided between the pressurization blower and the fresh air intake. A control circuit automatically provides a speed control signal to the pressurization blower, and a manually selected speed control signal is provided to the recirculation blower. A speed sensor senses the speed of the pressurization blower, which varies for a given speed control signal as a function of air pressure within the cab and the condition of the fresh air filter. The control circuit varies the speed control signal to the pressurization blower as a function of the pressurization blower speed to provide essentially constant air flow from the pressurization blower…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.