Method for monitoring the exhaust gas conversion rate of an exha

Details Method for monitoring the exhaust gas conversion rate of an exha Method for monitoring the exhaust gas conversion rate of an exha

1996-12-20

1999-08-03

Denion, Thomas E

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 300

Patent

active

059309938

ABSTRACT:
To improve monitoring of the conversion rate of an exhaust catalyst for an internal combustion engine, the HC emissions are determined downstream of the exhaust catalyst during a predetermined time interval. The time interval starting point and the time interval duration are dependent on the operating mode of the internal combustion engine which is detected, for example, by consideration of the fuel mass flow to the engine over time. The HC sum value thus accumulated during the time interval is compared with a limit value and, when a predetermined difference value results, an error signal is generated.

REFERENCES:
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patent: 5419122 (1995-05-01), Tabe et al.
patent: 5428956 (1995-07-01), Maus et al.
patent: 5524433 (1996-06-01), Adamczyk, Jr. et al.
patent: 5584176 (1996-12-01), Meyer et al.
patent: 5610844 (1997-03-01), Maus et al.
patent: 5675967 (1997-10-01), Ries-Mueller

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