Patent Application
20110031267
The present invention relates to the art of fuel dispensers. More particularly, the present invention relates to the detection of and response to fuel theft at a fuel dispenser.
As fuel prices continue to rise, small businesses and global enterprises find themselves paying more for nearly every input and service needed to bring their products and services to market. Consumers have had to adjust because they must pay more at the grocery store, shopping malls, and to fill up their tanks. Moreover, as fuel prices continue to rise, the incentive to steal fuel becomes greater. In regions of the United States, for example, fuel theft has become a significant cost to station owners. Station owners are demanding solutions to gaps in security that exist in dispensers.
The dispenser security gaps are not due to negligence on behalf of manufacturers, but rather to key differences in customer requirements for dispenser design. When fuel prices were much less, say $1.00/gal, the incentive to steal fuel was not as strong as it is when prices are above $4.00/gal. Therefore, with customers having less incentive to steal, station owners did not place a high value on security.
With dispenser and site layouts today, an attendant may never know theft has begun or occurred. Even if the attendant is able to detect theft by observation, they may not know how long it has been since the theft took place or how many people got free fuel (and therefore, information about the theft may not be available). In some cases, surveillance video footage shows multiple people orchestrating fuel theft to fill multiple vehicles over an extended period of time. News media make the problem worse by increasing attention to the issue of fuel theft, and in some instances, clearly describing and illustrating what was done to steal fuel.
In addition to tampering with dispensers, fuel thieves drive over the underground tank covers with a van; remove the tank cover from inside the van, and pump fuel out of the underground tank and into a storage tank in their vehicle.
The present invention recognizes and addresses the foregoing considerations, and others, of prior art constructions and methods.
The present invention recognizes and addresses disadvantages of prior art constructions and methods, and it is an object of the present invention to provide an improved fuel dispenser comprising a shear valve coupled to a riser pipe that is in fluid communication with an underground storage tank, a primary flow meter in fluid communication with the shear valve and positioned down stream from the shear valve, a control system operatively coupled to the shear valve and the flow meter and an auxiliary flow detection device in fluid communication with the riser pipe and positioned at an entrance of the dispenser. The control system is operatively coupled to the auxiliary flow detection device, configured to compare a reading obtained from the primary flow meter to a reading obtained from the auxiliary flow detection device, and configured to produce a shutoff signal if the result is larger than a predetermined value.
In some embodiments, the auxiliary flow detection device is located in a housing of the shear valve. In some of these embodiments, the control system is operatively coupled to the shear valve and the shutoff signal causes the shear valve to close. In other embodiments, the accuracy of the primary flow meter is greater than the accuracy of the auxiliary flow detection device. In yet other embodiments, the auxiliary flow detection device comprises a flow meter.
In still other embodiments, an auxiliary shutoff system is operatively coupled to the control system, so that when the control system sends the shutoff signal, the auxiliary shutoff system prevents fuel from flowing to the primary flow meter. In some of these embodiments, the auxiliary flow detection device and the auxiliary shutoff system are enclosed in a housing, positioned at the entrance to the dispenser and in fluid communication with the riser pipe.
In yet other embodiments, a point-of-sale terminal is operatively coupled to the primary flow meter and the auxiliary flow detection device, wherein the point-of-sale terminal is configured to compare a reading from the primary flow meter to a reading from the auxiliary flow detection device and generate a shutoff signal if the difference between the readings is larger than a predetermined threshold value.
In another preferred embodiment, a fuel dispenser comprises a control system, a display operatively coupled to the control system, a card reader operatively coupled to the control system, a shear valve coupled to a riser pipe in fluid communication with an underground storage tank, a primary flow meter in fluid communication with the shear valve, operatively coupled to the control system and positioned downstream from the shear valve, an auxiliary flow detection device in fluid communication with the riser pipe, operatively coupled to the control system, an auxiliary shutoff system operatively coupled to the control system and positioned upstream from the primary flow meter, and a point-of-sale terminal located remote from the dispenser and operatively coupled to the control system. One of the control system and the point-of-sale terminal is configured to compare a reading obtained from the primary flow meter to a reading obtained from the auxiliary flow detection device, and configured to send a shutoff signal to the auxiliary shutoff system if the result of the comparison is larger than a predetermined threshold value.
In some embodiments, the auxiliary shutoff system is part of the shear valve. In some of these embodiments, the auxiliary flow detection device is integrally located in a housing of the shear valve. In yet other of these embodiments, the auxiliary flow detection device and the auxiliary shutoff system are within a single housing, and the single housing is positioned at an entrance of the dispenser. In still other of these embodiments, the single housing is positioned intermediate the shear valve and the primary flow meter. In other embodiments, the auxiliary flow detection device is a flow indicator.
In a preferred method of detection fuel theft at a fuel dispenser, the method comprises the steps of providing a dispenser having a primary flow meter, an auxiliary flow detection device positioned down stream from a riser pipe to which the dispenser is operatively coupled, and an auxiliary dispenser shutoff system, calculating a rate of flow through the primary flow meter, calculating a rate of flow through the auxiliary flow detection device, comparing the primary flow meter rate of flow to the auxiliary flow detection device rate of flow, and providing a shutoff signal to the auxiliary dispenser shutoff system to stop fuel flow through the dispenser.
In other embodiments, the shear valve further comprises an auxiliary dispenser shutoff system. In yet other embodiments, the method further comprises the step of taking a photo of an area surrounding the dispenser when the shutoff signal is provided. In still other embodiments, the auxiliary flow detection device and the auxiliary dispenser shutoff system are integrally formed in a single housing. In other embodiments, the method further comprises the step of recording all information regarding the comparison in a storage device in one of the dispenser control system or a point-of-sale terminal coupled to the dispenser control system. In still other embodiments, the method further comprises the step of manually restarting the dispenser.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate one or more embodiments of a theft detection and shut-off system of the present invention.
A full and enabling disclosure of the present invention, including the best mode thereof directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:
Repeat use of reference characters in the present specification and drawings is intended to represent same or analogous features or elements of the invention.
Reference will now be made in detail to presently preferred embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention cover such modifications and variations. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be discerned from the description, or may be learned by practice of the invention.
Referring to
In the present invention, shear valve 38 includes an auxiliary flow detection device in the form of an auxiliary flow detection 12 that communicates with one or more of control system 48 and a remotely located point-of-sale (POS) terminal 24 over a communication line 22. Control system 48 and POS 24 are in communication with shear valve 38 via communication line 26 and can direct the shear valve to open or close, as described further below.
Referring to
A valve 40, which may be a proportional solenoid controlled valve, is positioned intermediate shear valve 38 and a flow meter 52. Alternatively, valve 40 may be positioned downstream of the flow meter 52 as shown in
Control system 48 may be a microcontroller, a microprocessor, or other electronic systems with associated memory and software programs running thereon to control other aspects of the fuel dispenser 14, such as display 30, a card reader 32, etc. Control system 48 is configured to direct valve 40, via a valve communication line 50, to open and close when fuel dispensing is desired. If control system 48 directs valve 40 to open to allow fuel to flow, fuel enters valve 40 and exits into fuel flow meter 52.
The volumetric flow rate is measured by fuel flow meter 52, which is then communicated to the control system 48 via a pulser signal 54. More specifically, flow meter 52 converts mechanical motion (in this case, pistons inside the flow meter move with fluid flow and in turn rotate a flow meter output shaft) into electrical signals. An encoder (or pulser) is connected or coupled to the flow meter output shaft. Therefore, the rotating flow meter output shaft is detected, interpreted by the encoder and converted into electronic signals. In one preferred embodiment, flow meter 52 generates one thousand (1000) pulses per gallon of fuel dispensed and transmits pulser signal 54 to control system 48. Control system 48 updates the total gallons dispensed and the price of fuel dispensed on display 30 via a communication line 56. Payment may be effected on card reader 32, which communicates with control system 48 via communication line 58.
As fuel exits fuel flow meter 52, the fuel enters a flow switch 60, which generates a flow switch communication signal that is sent to control system 48 via a flow switch communication line 62. The flow switch communication signal indicates when fuel is flowing through fuel flow meter 52. The fuel flow exits flow switch 60 through a fuel conduit 55, which is in fluid communication with a hose 18 and nozzle 20 for eventual delivery. It should be understood that in the present invention, flow switch 60 is not necessary since auxiliary flow detection device 12 performs the same function as flow switch 60.
Referring to
Downstream from flow meter 52 is valve 40. Control system 48 controls fuel flow by opening and closing valve 40. Flow switch 60 is located downstream of fuel flow meter 52 and valve 40 so that control system 48 has knowledge of when fuel flow is actually flowing through the dispenser. In alternate embodiments, flow switch 60 could also be located on the inlet side of fuel flow meter 52 either proximate to fuel flow meter 52 or before other components on the inlet side.
Auxiliary flow detection device 12 communicates with one or more of control system 48 and remotely located POS terminal 24 over a communication line 22. Control system 48 and POS 24 are operatively coupled to auxiliary shutoff system 11 via communication line 26 and can direct the auxiliary shutoff system to prevent fuel from flowing through dispenser 14. In this embodiment, auxiliary shutoff system 11 and an auxiliary flow detection device 12 may be separate components or may be located in a single housing that is positioned at the entrance of dispenser 14. As used herein, the “entrance” of the fuel dispenser is the location in the fuel flow path immediately upstream, downstream or at the location of the shear valve. These components may be located at the base of the dispenser or below ground level where they would be difficult to reach by a thief. In some embodiments, auxiliary shutoff system 11 and an auxiliary flow detection device 12 may be upstream from shear valve 38. Auxiliary flow detection device 12 may be a flow meter, flow indicator or any other suitable device for detecting the flow rate entering dispenser 10.
Referring to
Pulser 59 generates pulser signals on communication line 54 and may be incorporated into fuel flow meter 52, or may be external to the fuel flow meter. Shear valve 38 includes an auxiliary flow meter 12 that measures the flow of fuel entering dispenser 14 from the underground storage tank. A signal indicative of the amount of fuel passing through the shear valve is communicated to control system 48 and/or POS 24 via line 22. Control system 48 is in communication with shear valve 38 via communication line 50, and POS 24 is in communication with shear valve 38 via communication line 26, and either can direct the shear valve to open or close.
The present invention advantageously provides an auxiliary flow detection device that may preferably be located at the base of the dispenser (at or below ground level) so that it cannot be bypassed in a typical theft scenario. Thus, in one preferred embodiment, the auxiliary flow detection device may be a flow meter located where riser pipe 36 connects to dispenser 14. In other preferred embodiments, the auxiliary flow detection device may be any type of flow indicator capable of determining whether fuel is passing through riser pipe 36. That is, flow rate or flow signal may be communicated to control system 48 and/or POS 24. In any of these embodiments, an auxiliary shutoff valve may be separate from, or incorporated into, shear valve 38, where the auxiliary shutoff valve may be controlled from one or both of the dispenser control system and the remote POS.
It should also be understood from the above that the auxiliary shutoff system 11 and the auxiliary flow detection device 12 may be located in various other locations in dispenser 10. For example, in some embodiments, auxiliary flow detection device 12 may be located at nozzle 20 or at the break-away where hose 18 connects to dispenser 10. Similar to auxiliary flow detection device 12, auxiliary shut-off system 11 may also be located at nozzle 20 or at the break-away where hose 18 connects to dispenser 10.
In operation, and referring to
If, on the other hand, the difference between the calculated values exceeds the predetermined threshold value, at step 118, control system 48 and/or POS terminal 24 sends a shutoff signal to auxiliary shutoff system 11 and the differential is recorded as proof as to the amount of fuel that was stolen, at step 120. In addition to the differential amount, other information such as the time the discrepancy was detected, dispenser number and a photograph of the dispensing area (step 124) may also be included to help identify the thief and provide evidence to support any criminal charges. At step 126, dispenser 14 must be manually restarted to ensure that any additional theft is prevented. Once a manual restart is completed, at step 128, dispenser 14 is returned to step 100.
It should be understood that at step 124, additional alarms, both visual and audible may be included in the system to indicate when a theft has been detected. Such alarms may be instead of, or in addition to, obtaining a photograph. Moreover, in some instances, a direct comparison of the flow rate detected at flow meter 52 and at auxiliary flow detector 12 may be compared to determine whether a theft is occurring. In addition to alarms, the system may be configured to send an e-mail regarding the incident, phone authorities and/or send a text message to designated employees.
Another benefit of the above described invention is that leaks may be detected. That is, if auxiliary flow detection device 12 detects fluid flow when dispenser 14 is not engaged in a transaction, control system 48 may be programmed to provide a shutdown command to auxiliary shutoff system 12 to minimize any leak. Similar to the flow diagram show in
The present invention may also be used in pumping units (not shown). Pumping units have a pump located in the dispenser and when a transaction begins, the suction pump draws fluid out of the underground storage tank and pumps it into the car or storage tank. With a pumping unit, when a theft is detected, control system 48 is configured to provide a shutoff signal to the suction pump thereby preventing any additional fuel from being pumped from the underground storage tank.
While one or more preferred embodiments of the invention are described above, it should be appreciated by those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit thereof. It is intended that the present invention cover such modifications and variations as come within the scope and spirit of the appended claims and their equivalents.
