Control system for temperature compensated vapor recovery in gasoline dispenser
First Claim
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1. A liquid delivery system, comprising:
- a liquid delivery path adapted for engagement with a tank to be filled,means for delivering liquid to the tank along said liquid delivery path with a variable volumetric flow;
means for providing and electrical signal indicative of said volumetric flow;
a second path that is adjacent to said liquid delivery path;
vapor recovery means responsive to said electrical signal for sucking vapor from the tank along said second path with a nominal volumetric flow corresponding to the volumetric flow;
means for deriving second and third signals respectively representing the absolute temperatures of liquid in said liquid delivery path and vapor entering said second path; and
means responsive to said second and third signals for increasing the volumetric flow of the vapor recovery means when the temperature of the liquid is greater than the temperature of vapor and for decreasing the volumetric flow to the vapor recovery means when the temperature of the liquid is less than the temperature of vapor.
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Abstract
A system for recovering vapor emerging from a tank to which liquid is being delivered wherein a vapor pump sucks vapor from the tank with a volumetric flow that is equal to the volumetric flow of the liquid as modified so as to compensate for the change in volume of the emerging vapor caused by its proximity to the entering liquid, and apparatus for measuring the actual vapor flow and adjusting the volumetric flow of the vapor pump so that it is equal to the flow required for ideal compensation.
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Citations
10 Claims
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1. A liquid delivery system, comprising:
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a liquid delivery path adapted for engagement with a tank to be filled, means for delivering liquid to the tank along said liquid delivery path with a variable volumetric flow; means for providing and electrical signal indicative of said volumetric flow; a second path that is adjacent to said liquid delivery path; vapor recovery means responsive to said electrical signal for sucking vapor from the tank along said second path with a nominal volumetric flow corresponding to the volumetric flow; means for deriving second and third signals respectively representing the absolute temperatures of liquid in said liquid delivery path and vapor entering said second path; and means responsive to said second and third signals for increasing the volumetric flow of the vapor recovery means when the temperature of the liquid is greater than the temperature of vapor and for decreasing the volumetric flow to the vapor recovery means when the temperature of the liquid is less than the temperature of vapor. - View Dependent Claims (2, 9)
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3. For a fuel dispensing system, the method comprising the steps of:
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delivering fuel to a tank along a first path with a variable volumetric flow; producing an electrical signal indicative of the volumetric flow; sucking vapor from the tank in response to the electrical signal, along a second path that is adjacent to the first path with a nominal volumetric flow corresponding to the volumetric flow; producing second and third signals respectively representing the absolute temperatures of fuel in the first path and vapor entering the second path; and increasing the volumetric flow of the vapor being sucked, in response to said second and third signals, if the temperature of the fuel is greater than the temperature of vapor and decreasing the volumetric flow of the vapor being sucked, in response to said second and third signals, if the temperature of the fuel is less than the temperature of vapor. - View Dependent Claims (4)
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5. A fuel delivery system comprising:
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a first conduit, a fuel delivery pump adapted for withdrawing fuel form a fuel reservoir and forcing it along said first conduit; a meter coupled to said first conduit for providing a first signal indicative of the volumetric flow of fuel in said first conduit; a second conduit, a vapor recovery pump for withdrawing vapor along said second conduit; driving means for said vapor recovery pump; a controller responsive to said first signal for causing said driving means to drive said vapor recovery pump so that is has an initial nominal volumetric flow corresponding to the volumetric flow of fuel in said first conduit; a first transducer means for deriving a second signal indicative of the temperature of fuel in said first conduit; a second transducer means for deriving a third signal indicative of the temperature of vapor in said second conduit; and said controller also being responsive to said second and third signals for deriving a motor control signal which when applied to said driving means modifies the initial nominal volumetric flow provided by said vapor recovery pump in such manner as to reduce the difference int he volume of vapor emerging from a tank to which fuel is being delivered and the volume of the vapor passing through said vapor recovery pump. - View Dependent Claims (6, 7, 8, 10)
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Specification