Measuring and testing – Volume or rate of flow – Thermal type
Patent
1993-01-15
1994-09-06
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
731182, 123491, G01F 168
Patent
active
053437454
ABSTRACT:
An apparatus for detecting an intake air quantity for an internal, combustion engine and method therefor are disclosed in which a passed time from a time at which a power supply to a temperature sensitive airflow meter of a bridge circuit is turned on is measured as t. A CPU of the detecting apparatus retrieves a data on the intake air quantity from a data map storing the data on the intake air quantity, the passed time and output voltage of the temperature sensitive airflow meter to derive the intake air quantity data Q.sub.now. In addition, the CPU adds a value of a change rate of the present mapped data with respect to the previously derived final intake air quantity data Q.sub.-1 which is multiplied by a predetermined coefficient k to Q.sub.now. The result of addition is set as the present final intake air quantity data: Q.rarw.Q.sub.now +k (Q.sub.now -Q-.sub.-1). It is noted that the predetermined coefficient k is varied according to the passed time t.
REFERENCES:
patent: 4578996 (1986-04-01), Abe et al.
Goldstein Herbert
Japan Electronic Control Systems Co. Ltd.
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