Method of operation of air cleaner used in motor vehicle

Details Method of operation of air cleaner used in motor vehicle Method of operation of air cleaner used in motor vehicle

1990-05-30

1992-04-21

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

307 107, 324158MG, 340648, G01R 3106, H02H 718

Patent

active

051072181

ABSTRACT:
Method of operation of an air cleaner used in a motor vehicle, comprises the steps of: intermittently turning off a blower motor of the air cleaner at a given interval; detecting ripple components included in an output voltage developed by a dynamo driven by an engine of the motor vehicle by detecting the output voltage between dc power supply lines connected from the dynamo to the air cleaner; and maintaining turn off condition of the blower motor when the ripple component is lower than a given level during intermittently turning off the blower motor. When the engine is stopped, during the on interval of the blower motor, stoppage of the engine cannot be detected by watching the ripple components included in power supply lines. However, during the following intermittent turning off interval, stop of the engine can be detected because the ripple component due to operation of the blower motor is not developed. Therefore, the blower does not continue to run after the stopping of the engine, so that power stored in the battery is saved.

REFERENCES:
patent: 3037124 (1962-05-01), Carlson
patent: 3742303 (1973-06-01), Dageford
patent: 4459548 (1984-07-01), Lentz et al.
patent: 4682263 (1987-07-01), Gradnitzer et al.
patent: 4733100 (1988-03-01), Nusairat et al.
patent: 4789834 (1988-12-01), Koopman
patent: 4950913 (1990-08-01), Kephart

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