Method and apparatus for monitoring for a restriction in a stage II fuel vapor recovery system
First Claim
1. A fuel dispensing system for dispensing fuel from a plurality of dispensing nozzles into vehicles, the plurality of dispensing nozzles being associated with a fuel dispenser having a first dispensing nozzle with a first fuel sensor monitoring fuel dispensed by the first dispensing nozzle and a second dispensing nozzle with a second fuel sensor monitoring fuel dispensed by the second dispensing nozzle, the fuel dispensing system including a vapor recovery system, the vapor recovery system comprising:
- a return flow sensor providing a return flow signal of an amount of vapor returned by the first dispensing nozzle and the second dispensing nozzle; and
a controller, wherein the controller monitors the first fuel sensor, the second fuel sensor, and the return flow sensor and determines A/L ratios for each of the first dispensing nozzle and the second dispensing nozzle, wherein if both the first dispensing nozzle and the second dispensing nozzle are active the controller ignores the return flow signal of the return flow sensor.
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Accused Products
Abstract
Systems and methods for detecting a failure in a Stage II fuel vapor recovery system are disclosed. An exemplary failure is a restriction in the vapor recovery system. In one detection system dispensing points may be flagged if it is determined that there has been a series of detected A/L ratios at the respective dispensing point below a first threshold. Further, an estimated ORVR penetration percentage may be determined for each dispensing point. In a second detection system an average A/L ratio for each dispensing point may be determined. The average A/L ratio may be an approximation of the average A/L ratio for non-ORVR transactions.
219 Citations
6 Claims
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1. A fuel dispensing system for dispensing fuel from a plurality of dispensing nozzles into vehicles, the plurality of dispensing nozzles being associated with a fuel dispenser having a first dispensing nozzle with a first fuel sensor monitoring fuel dispensed by the first dispensing nozzle and a second dispensing nozzle with a second fuel sensor monitoring fuel dispensed by the second dispensing nozzle, the fuel dispensing system including a vapor recovery system, the vapor recovery system comprising:
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a return flow sensor providing a return flow signal of an amount of vapor returned by the first dispensing nozzle and the second dispensing nozzle; and a controller, wherein the controller monitors the first fuel sensor, the second fuel sensor, and the return flow sensor and determines A/L ratios for each of the first dispensing nozzle and the second dispensing nozzle, wherein if both the first dispensing nozzle and the second dispensing nozzle are active the controller ignores the return flow signal of the return flow sensor. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification