Method of and apparatus for monitoring operation of a catalytic

Details Method of and apparatus for monitoring operation of a catalytic Method of and apparatus for monitoring operation of a catalytic

1991-02-14

1993-01-05

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

60274, 60277, 340439, B60Q 100

Patent

active

051774631

ABSTRACT:
Sensors measure the temperatures of exhaust gas upstream and downstream of a catalytic converter for internal combustion engine exhaust gas. The difference between the temperatures is multiplied by the rate of mass flow of exhaust gas and the result is integrated or low pass filtered to provide a measure of converter operation. Alternatively, the multiplication is omitted and the difference between the temperatures is integrated or filtered. Thus, the performance of the catalytic converter is monitored by evaulating the difference in the heat supplied to the catalytic converter and the heat removed from the catalytic converter by the exhaust gas.

REFERENCES:
patent: 3882451 (1975-05-01), Fujishiro
patent: 3962866 (1976-06-01), Neidhard
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4315243 (1982-02-01), Calvert, Sr.
patent: 4338511 (1982-06-01), Six
patent: 4389993 (1983-06-01), Long
patent: 5060473 (1991-10-01), Nakagawa

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