Tunnel operation for self-propelled traction vehicles
US5561602A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1994 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Jul 1, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L2200/26
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a tunnel control system for traction vehicles, the normal deration function is suppressed to delay deration in a tunnel. The traction vehicle is provided with a controller having a normal operation mode and a tunnel operation mode. A tunnel indicator connected to the controller provides an indication of when the vehicle is approaching a tunnel and causes the controller to switch into the tunnel operation mode. In this mode, the controller increases cooling to reduce the temperature of the vehicle's prime mover and the control electronics prior to entering the tunnel. As the traction vehicle enters the tunnel, the controller monitors the engine oil temperature and the ambient air temperature. If the ambient air temperature exceeds a predetermined value, then the cooling of the control electronics is discontinued. If the oil temperature exceeds a threshold (which is about 10.degree. C. higher than the normal deration threshold), then power to the prime mover is derated. After the vehicle exits the tunnel, the prime mover and control electronics are gradually cooled to avoid thermal shock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.