Topic
Thermal mass flow meter
About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.
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Patent•
16 Apr 1997TL;DR: In this paper, a gas fuel admission system for use with a gas supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal is presented. But the system is not suitable for the use with an external power supply.
Abstract: A gas fuel admission system for use with a gas fuel supply and an internal combustion engine having an engine control unit that produces a desired mass flow signal. The system has a continuously variable gas fuel admission valve having a flow control element and nozzle for metering gas in sonic flow from the gas supply to the engine with insensitivity to the valve discharge pressure. An actuator moves the flow control element relative to the nozzle. The system also has a flow control circuit that responds to the desired mass flow signal from the engine control unit, a gas supply pressure signal from a gas supply pressure sensor, a gas supply temperature signal from a gas supply temperature sensor, and a flow control element position signal from a flow control element position sensor to determine the appropriate flow control element position needed to achieve the desired mass flow at the present engine operating conditions.
17 citations
TL;DR: In this paper, the mass flow rate of gas exiting an initially pressurized plenum is determined to reasonably high accuracy without the need for calibrated flow meters, which is applicable to discharge processes in which the Mass Flow Rate is controlled by a sonic orifice.
17 citations
Patent•
22 Feb 2012TL;DR: In this paper, the authors propose a control device connected to a feedback control loop for regulating the proportional valve based on signals measured by the mass flow sensor, wherein the control device includes a program for keeping a rate of a flow exiting the exit line substantially constant when the flow is through the second flow line.
Abstract: An MFC includes: a proportional valve; a mass flow sensor; a first flow line connecting from an outlet of the proportional valve through the mass flow sensor to an exit line; a second flow line joining the first flow line at a first junction located upstream of the mass flow sensor and at a second junction located downstream of the mass flow sensor; a switching valve placed such that the switching valve can regulate a flow of a gas through the first flow line or the second flow line; and a control device connected to provide a feedback control loop for regulating the proportional valve based on signals measured by the mass flow sensor, wherein the control device includes a program for keeping a rate of a flow exiting the exit line substantially constant when the flow is through the second flow line.
17 citations
Patent•
18 Dec 1998
TL;DR: In a coriolis flow meter, two drivers are provided and a measure of mass flow rate derived from the adjustment of the input signals to each driver required to achieve a desired phase shift in the output as mentioned in this paper.
Abstract: In a coriolis flow meter, two drivers are provided and a measure of mass flow rate derived from the adjustment of the input signals to each driver required to achieve a desired phase shift in the output. This may give higher accuracy compared to conventional meters in which the phase shift is simply measured, and may also enable determination of other characteristics of the fluid.
17 citations
Patent•
02 Aug 2012
TL;DR: In this article, the level loop control of a turbine flow meter is discussed, where a sensor is used to determine a first pressure of a liquid in a tank, and a second pressure of the liquid in the tank is determined if the first pressure is within a specified range of deviation from the second pressure.
Abstract: Example methods and apparatus for level loop control are disclosed. A disclosed example method includes determining via a sensor a first pressure of a liquid in a tank, determining via a turbine flow meter a second pressure of the liquid in the tank, determining if the first pressure is within a specified range of deviation from the second pressure to determine an operational state of the turbine flow meter, and transmitting a diagnostic message indicating that the turbine flow meter needs to be serviced based on the state of the turbine flow meter.
17 citations