Fluent material handling – with receiver or receiver coacting mea – With testing or weighing receiver content
Patent
1992-09-16
1994-10-18
Cusick, Ernest G.
Fluent material handling, with receiver or receiver coacting mea
With testing or weighing receiver content
141 59, 141198, 141 44, B65B 318
Patent
active
053559150
ABSTRACT:
A vapor recovery fuel dispenser includes a liquid fuel pump for pumping and blending liquid fuels from fuel reservoirs along a fuel delivery line to an outlet. A vapor pump returns fuel vapors from proximate the outlet along a vapor return line to a repository. An electric motor drives the pump in response to a signal. An electrically-activatable valve is provided in the vapor return line. A first sensor generates a first pulse train representative of the flow rate of the liquid fuel pump and a second sensor generates a second pulse train representative of the flow rate of the vapor pump.
A controller is operably interposed between the liquid fuel pumps and the vapor pump. The controller monitors whether the liquid pumps are operating, whether the vapor pump motor is operating, and the electrical current to the vapor pump motor. It also outputs an electrical signal to open the valve when the motor or liquid fuel pump is operating and to close the valve when motor operation or liquid pumping is not detected. Further, it controls the speed of the vapor pump to return substantially all fuel vapors proximate the outlet with substantially no air in response to evaluations of the pulse trains. The controller also disables operation of the vapor pump when the liquid pumps are not operating, vapor pump motor operation is detected while not signaled to operate, or the monitored current indicates a system error.
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Cusick Ernest G.
Gilbarco
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