Application of a Mass Airflow Sensor to the Automotive Environment

Mass Airflow Sensors (MAS) are being applied in increasing number to fuel injected engines. The primary reason for this is desensitization of intake air measurements to engine variation along with improved accuracy with altitude and temperature changes. When applying a MAS to a fuel injection system, a number of considerations must be addressed to insure a quality measurement is obtained. This paper will discuss the operation of the GM hot film mass airflow sensor and overview its application to fuel injected engines.