Exhaust-gas recycling device for an internal-combustion engine,

Details Exhaust-gas recycling device for an internal-combustion engine, Exhaust-gas recycling device for an internal-combustion engine,

1990-09-18

1991-07-30

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02M 2507, F02D 2108

Patent

active

050352288

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.

REFERENCES:
patent: 3990418 (1976-11-01), Nohira et al.
patent: 4221204 (1980-09-01), Meyer
patent: 4497335 (1985-02-01), Masuda
patent: 4531498 (1985-07-01), Bradshaw
patent: 4540153 (1985-09-01), Gomi et al.

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