System for purifying exhaust gas from a diesel engine

Details System for purifying exhaust gas from a diesel engine System for purifying exhaust gas from a diesel engine

1987-05-21

1989-05-23

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60288, F01N 302

Patent

active

048318213

ABSTRACT:
A device for detecting a timing at which a refresh operation should be commenced for a filter for trapping particulates in exhaust gas in a diesel engine. The device calculates a trapping ratio by the filter from smoke density values at positions upstream and downstream of the filter, respectively. The smoke density at the position upstream of the filter is detected or is calculated from a data table in a memory. The detected trapping ratio is compared with a predetermined threshold value to determine whether it is time to commence a refresh operation for the filter. The threshold value is fixed or calculated from a data table in a memory.

REFERENCES:
patent: 4404795 (1983-09-01), Oishi et al.
patent: 4604868 (1986-08-01), Nomoto
patent: 4698966 (1987-10-01), Distel

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