Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1990-07-09
1992-02-04
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
55466, 55DIG30, 60278, 60279, 60288, 60289, 60295, F01N 302
Patent
active
050850490
ABSTRACT:
A diesel engine exhaust filtration system and method which removes both diesel particulate matter (DPM) and unburned hydrocarbons (UHC) from the exhaust gases. Two filters in parallel are used, each alternating operation as the other regenerates. Each filter is preferred to be constructed in a conventional manner and operates at between 100 to 300 degrees Centigrade. A microprocessor controlled valve system regulates which filter is active and which is regenerating and/or inactive. DPM accumulates at the active filter, with UHC condensing on the DPM. When the active filter becomes clogged, the microprocessor switches it to inactive status, and switches the other filter to active status. Low temperature regeneration is initiated by the microprocessor in which DPM and UHC burn slowly across the entire filter. A recirculation conduit provides for the gases produced by the regeneration to be directed to the air intake of the diesel engine. Any remaining UHC or DPM will be subsequently burned in the combustion chambers of the diesel engine or taken out by the other active filter. When regeneration has completed, the inactive filter will await being switched by the microprocessor to active status when the other filter has become sufficiently clogged that it is time for it to be regenerated.
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Exhaust-Pollution Control Developments, Research and Development 2 pages, dated before Jun. 1990.
Letter of Oct. 19, 1990, from St. of California, Air Resources Board.
Rim Ho
Rim Julius J.
Hart Douglas
Keefe Peter D.
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