Exhaust gas purifying device for an internal combustion engine

Details Exhaust gas purifying device for an internal combustion engine Exhaust gas purifying device for an internal combustion engine

1993-01-19

1994-02-22

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60285, 60288, F01N 302

Patent

active

052876985

ABSTRACT:
Parameters which are related to the rate at which particulate matter accumulates and is reburnt, are monitored and the time at which a regeneration is required and/or the length of time a regeneration should be induced, are derived based on the same. The temperature at the inlet and outlet of a trap in which particulate matter is accumulated are monitored and measures such as throttling the induction and exhaust are implemented in addition to energizing a heater disposed immediately upstream of the trap as required in order to elevate the trap temperature and to induce and maintain the reburning during a trap regeneration.
The pressure differential across the trap can be used to determine the amount of incombustible matter (ash) which has a accumulated in the trap and to modify the regeneration timing.
When the temperature of the exhaust gases cannot be raised sufficiently, a by-pass is opened to attenuate cooling of the trap by the low temperature gases.

REFERENCES:
patent: 4450681 (1984-05-01), Sato
patent: 4450682 (1984-05-01), Sato
patent: 4509327 (1985-04-01), Enga
patent: 4558565 (1985-12-01), Kojima
patent: 4698966 (1987-10-01), Distel
patent: 4835963 (1989-06-01), Hardy
Patent Abstracts of Japan, vol. 10, No. 66 (M-461) (2123) and Japanese 60-212609.
Patent Abstracts of Japan, vol. 9, No. 238 (M-416) (1961) and Japanese 60-93109.
Patent Abstracts of Japan, vol. 9, No. 264 (M423) (1987) and Japanese 60-111013.

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