Mass airflow measuring apparatus

Details Mass airflow measuring apparatus Mass airflow measuring apparatus

2005-03-01

2005-03-01

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

C073S118040

Reexamination Certificate

active

06860149

ABSTRACT:
To offer a mass airflow measuring apparatus in which the effect of the adhesion onto the heating resistor caused while the engine is off is reduced and the measuring accuracy is improved. The apparatus measures the mass airflow of the air sucked into the internal combustion engine, using the heating resistor1.The power control circuit4maintains the heating resistor1temperature equal to or higher than the temperature during the operation of the internal combustion engine after the internal combustion engine has stopped and until the temperature of the internal combustion engine and its apparatuses installed in the suction system has lowered below the generation temperature of volatile gas such as oil vapor. The power control circuit4,using the temperature sensing resistor2that detects the temperature of the air sucked into the combustion engine, detects the air temperature and maintains the heating resistor1temperature, based on the temperature measured, equal to or higher than the temperature during the operation of the internal combustion engine even after the internal combustion engine has stopped.

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