Two-stroke internal-combustion engine depollution process and as

Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means

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123 73C, 123406, 123416, F02B 1700, F02P 504

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057493332

ABSTRACT:
The present invention relates to a two-stroke internal-combustion engine depollution process including a separate and deferred delivery of fuel in relation to the air used to scavenge the burned gases, and having an advanced ignition delay with respect to optimal advanced ignition. According to the invention, the delay is such that it allows the exhaust gas temperature to increase and to create a post-oxidation of the unburned hydrocarbons contained in the exhaust gases, the post-oxidation sparing the use of a specific catalyst at the exhaust. Preferably, the delay is achieved in a stabilized-speed operating range of the engine.

REFERENCES:
patent: 3734069 (1973-05-01), Akiyama et al.
patent: 4111010 (1978-09-01), Minami
patent: 5050551 (1991-09-01), Morikawa
Patent Abstracts of Japan, vol. 003, No. 097 (M-069), Aug. 17, 1979 & JP-A-54 072334 (Fuji Heavy Ind. Ltd.), Jun. 9, 1979.
Sae Techn. Papers SAE720195--1972, pp. 704-722, XPOO2003646, Glichi Yamagishi, et al; "A Study of Two-Stroke Cycle Fuel Injection Engines for Exhaust Gas Purification".

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