Exhaust-gas recycling device for an internal-combustion engine, epsecially a diesel engine
US5035228A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Sep 18, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B3/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an exhaust-gas recycling device for an internal combustion engine, especially a diesel engine, in which the quantity of the recycled exhaust-gas part stream is controlled by an exhaust-gas recycling valve equipped with a diaphragm, the material of which can be destroyed above a specific temperature, a reliable closing of the valve before the critical diaphragm temperature is reached will be achieved. For this purpose, the diaphragm is loaded by a spring, the spring force of which is temperature-dependent. If the temperature dependence is to set, for example by the use of a memory material, that, in a predeterminable upper temperature range, the spring force increases with an increasing temperature, the valve can be closed to prevent diaphragm overheating in an engine-operating state in which it would still be opened per set for the recycling of exhaust gas. Not only a memory alloy, but also a bimetal or combination of these two materials is suitable as a material for a spring acting in this way.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.