Method and apparatus for measuring mass airflow

Details Method and apparatus for measuring mass airflow Method and apparatus for measuring mass airflow

1983-05-23

1984-08-07

Gill, James J.

Measuring and testing

Simulating operating condition

Marine

73195, 73197, 73202, G01F 176, G01F 700

Patent

active

044636016

ABSTRACT:
Where airflow through a system is subject to forward and reverse flow, the mass airflow rate is determined by providing two flow branches A and B meeting at a junction wherein the two branches carry different proportions of airflow in the forward and reverse directions and branch B carries a greater fraction of the airflow during reverse flow than during forward flow. An airflow sensor in each branch measures the airflow irrespective of flow direction to obtain mass flow rate signals R.sub.A and R.sub.B for branches A and B, respectively. The mass airflow rate m is calculated from the equation m=K.sub.A R.sub.A -K.sub.B R.sub.B where m, K.sub.A and K.sub.B are constants for a given apparatus which are determined by each sensor characteristic and the flow characteristics of the junction. The resultant mass flow rate signal m will have a positive or negative sign indicative of forward or reverse flow. Integrating the value m over a time period and dividing by the time period yields the average mass airflow rate for the period.
This method and apparatus can be used to obtain accurate induction airflow measurements for internal combustion engines.

REFERENCES:
patent: 4142407 (1979-03-01), Kuroiwa et al.
patent: 4264961 (1981-04-01), Nishimura et al.
patent: 4404846 (1983-09-01), Yamauchi et al.

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