Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1991-09-04
1993-01-05
Ng, Jin F.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340438, 340633, 60277, B60Q 100
Patent
active
051774640
ABSTRACT:
An on-board monitoring system for an automotive emission catalyst has (i) a test chamber remote from the automobile's engine exhaust gas stream; (ii) apparatus for supplying the chamber with sampled exhaust gases sequestered from the stream; (iii) a single hydrocarbon sensor exposed to the exhaust gas in the chamber to render a signal responsive to the concentration of hydrocarbon in the chamber; and (iv) apparatus for comparing the sensed signal with a reference signal, and, if a predetermined difference is exceeded, the catalyst is indicated as faulty. Apparatus (ii) has a supply channel interconnected between the chamber and the gas stream upstream of the catalytic converter, a supply channel independently interconnected between the chamber and the gas stream downstream of the catalytic converter, and valve apparatus for permitting flow-through of no more than one channel to the chamber at any one moment, preferably cycled at a certain frequency. Method steps carried out by the system comprise: (a) periodically transferring a sample quantity of gas from the stream into a test chamber at a predetermined flow rate; (b) exposing a hydrocarbon sensor to the sequestered gas to generate a signal in proportion to the content of hydrocarbon in such gas; and (c) comparing the signal with a reference signal to determine if a predetermined difference exists and thereby conclude the catalyst is sufficiently degraded.
REFERENCES:
patent: 3801973 (1974-04-01), Grabiel et al.
patent: 3938075 (1976-02-01), Reddy
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 3998095 (1976-12-01), Tinkham et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4116053 (1978-09-01), Blanke
patent: 4149408 (1979-04-01), Ezoe et al.
patent: 4167925 (1979-09-01), Hosaka et al.
patent: 4175427 (1979-11-01), Blanke
patent: 4884066 (1989-11-01), Miyata et al.
Ford Motor Company
Malleck Joseph W.
May Roger L.
Ng Jin F.
Oda Christine K.
LandOfFree
Catalyst monitoring using a hydrocarbon sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Catalyst monitoring using a hydrocarbon sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalyst monitoring using a hydrocarbon sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2393430