Heat-insulating engine with swirl chamber

Internal-combustion engines – Precombustion and main combustion chambers in series – Having combustible mixture forming means

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Details

123300, 123508, F02M 4506, F02B 1914

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active

050819704

ABSTRACT:
The heat-insulating engine with swirl chamber of this invention injects fuel at a low pressure along the inner wall surface of swirl chambers having a heat-insulating structure by subsidiary nozzles opened and closed electrically, from the second half of an intake stroke to a compression stroke, and then injects mainly the fuel by main nozzles into the swirl chambers from the second half of the compression stroke to an expansion stroke. Atomization of the fuel from the subsidiary nozzles may be to such an extent that the fuel merely attaches to the wall surface; hence, the subsidiary nozzles can be of an accumulation type low pressure injection type. The fuel from the subsidiary nozzles is injected to the wall surface of the swirl chambers in the contact state so as to deprive the wall surface of the heat and thus to recover the heat. Main injection is effected following the sibsidiary injection and a rich mixture is generated inside the swirl chambers so as to restrict the generation of NOx and to improve cycle efficiency. It is possible to prevent a lean mixture from diffusing into cylinders. Since the fuel of subsidiary injection is caused to stay inside the swirl chambers, degradation of hydrocarbon components can be reduced.

REFERENCES:
patent: 2594681 (1952-04-01), Ricardo et al.
patent: 2858814 (1958-11-01), Meurer
patent: 4217871 (1980-08-01), Ohashi et al.
patent: 4733641 (1988-03-01), Ishida
"Patent Abstracts of Japan", vol. 10, No. 44, Diesel Engine, Isuzu Jidosha K.K.; Feb. 21, 1986.
"Patent Abstracts of Japan", vol. 6, No. 109, Internal Combustion Engine, Nippon Jidoushiya Kenkyusho, Jun. 19, 1982.

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