Flow measurement system providing indication of atmospheric (barometric) pressure
First Claim
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1. A system comprising:
- an orifice coupled to an engine;
a first gauge pressure sensor coupled upstream of the orifice;
a second absolute pressure sensor coupled downstream of the orifice; and
a valve coupled upstream of said orifice;
a computer storage medium having a computer program encoded therein for measuring flow through said orifice, said computer storage medium comprising;
code for calculating an estimate of atmospheric pressure; and
code for determining the flow based on said gauge pressure sensor, said absolute pressure sensor, and said estimate of atmospheric pressure.
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Abstract
A method for measuring flow through an orifice using an upstream gauge pressure sensor and a downstream absolute pressure sensor determines atmospheric pressure when flow through the orifice is substantially zero, or less than a predetermined value. Then, this estimate, along with the upstream and downstream pressure sensors are used to measure flow through the orifice.
26 Citations
15 Claims
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1. A system comprising:
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an orifice coupled to an engine;
a first gauge pressure sensor coupled upstream of the orifice;
a second absolute pressure sensor coupled downstream of the orifice; and
a valve coupled upstream of said orifice;
a computer storage medium having a computer program encoded therein for measuring flow through said orifice, said computer storage medium comprising;
code for calculating an estimate of atmospheric pressure; and
code for determining the flow based on said gauge pressure sensor, said absolute pressure sensor, and said estimate of atmospheric pressure. - View Dependent Claims (2, 3, 4, 5)
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6. An article of manufacture, comprising:
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a computer storage medium having a computer program encoded therein for measuring flow through an orifice having a gauge pressure sensor coupled upstream of the orifice and an absolute pressure sensor coupled downstream of the orifice, said computer storage medium comprising;
code for calculating an estimate of atmospheric pressure; and
code for determining the flow based on a gauge pressure sensor reading, an absolute pressure sensor reading, and said estimate of atmospheric pressure. - View Dependent Claims (7, 8)
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9. A method for measuring flow through an orifice having a relative pressure sensor coupled upstream of the orifice and an absolute pressure sensor coupled downstream of the orifice;
- the method comprising;
calculating an estimate of atmospheric pressure; and
determining the flow based on a relative pressure sensor reading, an absolute pressure sensor reading, and said estimate of atmospheric pressure. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- the method comprising;
Specification