PRESSURE OR FLOW RATE MEASURING

Brand	Owner	Address	Description
FERRELLGAS	FERRELLGAS PARTNERS, L.P.	7500 College Blvd, Suite 1000 Overland Park KS 66210	pressure and/or flow rate measuring instruments used in the storage, transportation, and distribution of flammable gas;FERRELL GAS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

The present invention embodies an engine intake air flow meter measuring a mass flow rate based on measured pressures in an intake pipe, such as a pressure difference between two points and a pressure at a point. Calculations for integration and double integration of the pressure difference are performed, and both values of integration and double integration are corrected at a moment when an air flow rate is detected to be a zero based on a value of a time derivative of the pressure. Then a mass flow rate and an amount of air are calculated by the value of integration and the value of double integration respectively.