Patent Grant
11247894
The present invention relates to a vehicular fuel-selecting system and apparatus, and to a method of using the system and apparatus to select and if necessary, blend an appropriate fuel for a vehicle.
More particularly, the present invention relates to a vehicular fuel-selecting system and apparatus in which one of a plurality of liquid fuels is automatically selected and dispensed for a particular vehicle through a single hose and nozzle, based on an interaction between a fuel filler neck on the vehicle and a fuel dispenser pump nozzle assembly.
A number of different fuel filler necks and dispenser pump nozzle assemblies are known. As one example, when unleaded gas became commonly used in the automotive industry, the diameter of dispenser nozzle spout was reduced for pumps which dispensed unleaded gas, and the size of an opening formed in vehicle fuel filler necks was reduced accordingly, so that a larger pump nozzle would be unable to fit in a fuel filler neck of an unleaded vehicle.
In past instances when certain vehicles required a specific fuel and/or must be prevented from using a particular fuel, different diameter fuel filler nozzle spouts were used in conjunction with a hardened fuel filler neck restrictor that would permit the insertion of nozzle spout equal to or less than the diameter of the restrictor e.g., U.S. Pat. No. 3,730,216 dated May 1, 1973. The diameter of fuel nozzle spouts in nozzles intended for the sale of fuels incompatible with that vehicle would have diameters larger than the fuel filler neck restrictor and thus be unable to be used to refuel the vehicle.
This simple system had a significant drawback: each fuel required a separate fuel hose and nozzle. This was acceptable when the only two fuels at most retail outlets were gasoline with and without lead. Today, however, there are multiple types of gasoline blend fuels such as gasoline blended with ethanol that are only suitable in specific vehicles. Furthermore, most gasoline pumps have only a single hose and nozzle that deliver multiple fuel types.
Examples of some of the known fuel filler necks, and dispenser pump nozzle assemblies, and related technology include those described in U.S. Pat. Nos. 4,034,784, 4,153,085, 4,195,673, 5,365,984, 5,390,712, 5,645,115, 6,571,151, 8,100,155, and 8,869,846.
An example of a known ethanol blending system, as well as methods of blending gasoline with non-petroleum fuels at a retail station, is described in published US patent application 2011/0233233 A1.
In addition, U.S. Pat. No. 1,850,626 dated Mar. 22, 1932, discloses a low air pressure sensor activating a light to warn a driver that the air pressure on a vehicle's air brake system has fallen too low to be effective.
Although the known fuel filler necks and dispenser pump nozzle assemblies are useful for their intended purposes, a need still exists in the art for an improved vehicular fuel-selecting and dispensing system, apparatus and method. In particular, there is a need for an improved vehicular fuel-selecting and dispensing system, apparatus and method which will automatically select and, if necessary blend, an appropriate fuel for a specific vehicle.
Accordingly, it is an object of the present invention to provide a method and apparatus for automatically selecting a specified and, if necessary blend, an appropriate liquid fuel for a vehicle, when a fuel dispensing nozzle is inserted into a fuel filler neck of the vehicle.
The present invention provides a nozzle-based fuel selection and blending system, which is designed to allow any selected one of multiple fuel blends to be sold through the same hose and nozzle, and which automatically ensures that an appropriate fuel is used in each vehicle.
The system hereof may be adapted in large scale by the automotive and fuel industries. Alternatively, the system hereof may be adapted for private use such as in a fleet of privately-owned vehicles which require different fuel blends.
Where the traditional system of various nozzle diameters only uses the area of the nozzle's x and y axes, the current applicant's design utilizes the displacement of the collar member in a third, z axis to define other types of fuels suitable for use in a given vehicle such as, for example, fuels with different amounts of ethanol.
Important aspects of this selection system include equipping each vehicle with a specialized fuel filler neck, as well as a fuel dispensing pump assembly having the following features:
A fuel delivery system, according to a first illustrative embodiment of the invention, is configured to automatically select an appropriate fuel blend for a specific vehicle, out of a plurality of available fuels.
The fuel delivery system according to the first illustrative embodiment includes a pump base, a hose assembly operatively attached to the pump base, and a nozzle assembly affixed to a distal end of the hose assembly.
The fuel dispenser pump also includes an electronic controller configured to select an appropriate fuel based on at least one signal generated by a sensor disposed on the nozzle assembly.
In this first embodiment hereof, which is distinguished by using electronic communication between the fuel nozzle and the dispensing pump control computer, the nozzle assembly includes a body portion having a nozzle fuel channel formed therein, a valve subassembly including a trigger portion, and a nozzle spout in fluid communication with the nozzle fuel channel, the nozzle spout including a dispensing tube defining an outlet and having a stop member affixed to an exterior thereof.
The nozzle assembly also includes a cylindrical collar member slidably mounted on the nozzle spout, and a spring, disposed on the exterior of the dispensing tube between the stop member and the collar member.
The nozzle assembly also includes a collar position sensor, mounted between the spring and the stop member, which is configured to generate a collar position signal based on increased pressure from the compression of the spring as the collar member on the dispensing tube is displaced when the dispensing tube is fully inserted into a fuel filler neck of the specific vehicle.
The controller is configured to select an appropriate fuel for a given vehicle, based on the collar position signal received from the sensor.
Optionally, the nozzle assembly may include a wireless transmitter for wirelessly sending the signal to the controller.
Alternatively, the signal may be sent via optic fiber transmission.
The hose assembly has a hose fuel channel extending therethrough, and may also have at least one communication channel extending therethrough separate from the hose fuel channel.
The nozzle assembly has a nozzle fuel channel extending therethrough, and may also have at least one communication channel extending therethrough separate from the nozzle fuel channel.
The nozzle assembly also includes a valve subassembly with a trigger portion.
A second illustrative embodiment of the present invention, which is distinguished by using pneumatic or other non-electronic communication between the fuel nozzle and the dispensing pump control computer, provides a fuel delivery system configured to automatically select an appropriate fuel for a specific vehicle, out of a plurality of available fuels. The fuel delivery system according to the second illustrative embodiment hereof includes a fuel dispenser pump having an electronic controller therein, the fuel dispenser pump in fluid communication with a nozzle spout having a sliding collar member thereon that, when displaced by a restrictor in a fuel filler neck on a specific vehicle, vents at least one air pressure line connected to the nozzle spout and originating at the fuel dispenser pump.
The fuel delivery system according to the second illustrative embodiment may include a vehicle fuel filler neck with a restrictor member therein and disposed at a specified distance from a locking channel in an inlet of the filler neck, wherein, when the fuel dispenser nozzle is inserted, the restrictor displaces the collar member by the specified distance.
The fuel delivery system according to the second illustrative embodiment also includes at least one pressurized airline extending to the nozzle spout from the fuel dispenser pump, and at least one air pressure sensor, in the fuel dispenser pump, that is configured to generate an signal, readable by the electronic controller, when air pressure in the at least one air pressure line is reduced by a specified amount.
In a third illustrative embodiment hereof, the present invention encompasses a method of selecting a fuel or fuel blend to be dispensed into a vehicle. The method includes a first step of inserting a nozzle spout of a nozzle assembly, operatively connected to a dispensing pump, into a fuel filler neck of a vehicle having a restrictor member therein with a calibrated opening formed in the restrictor member.
The method according to the third illustrative embodiment may also include a step of placing a tip of the nozzle spout into the opening of the restrictor member, and moving the nozzle spout, in relation to the fuel filler neck, until a collar member on the nozzle tip is displaced by a specified distance.
The method according to the third illustrative embodiment may also include a step of generating a signal based on the distance that the collar member is displaced, and sending the signal to a processor.
The method according to the third illustrative embodiment also includes a step of selecting one of a plurality of fuels based on the signal received by the processor.
A fourth illustrative embodiment of the present invention provides an additional method of selecting a fuel to be dispensed into a vehicle, using the system according to the second embodiment.
The fuel-selecting method according to the fourth illustrative embodiment includes a first step of inserting a nozzle of a dispensing pump into a fuel filler neck of a vehicle having a restrictor member therein, with an opening formed in the restrictor member.
The fuel-selecting method according to the fourth illustrative embodiment also includes a second step placing a tip of the nozzle into the opening of the restrictor member, and moving the nozzle inwardly in relation to the fuel filler neck until a collar member on the nozzle tip is displaced by a specified distance.
The fuel-selecting method according to the fourth illustrative embodiment also includes a third step of engaging a tooth, disposed inside of the vehicle's fuel filler neck, in a retaining channel formed by a slot in the flange on the nozzle, the retaining channel disposed at the specified distance from the restrictor member.
In practicing the method according to the fourth illustrative embodiment, when the collar member on the nozzle tip is displaced, a valve opens to release compressed air from the nozzle tip and to lower an air pressure level in a chamber of a signal converter, where the chamber is in fluid communication with a compressed air passage in the nozzle tip.
The fuel-selecting method according to the fourth illustrative embodiment also includes a fifth step of generating a signal based on the lowered air pressure level in said chamber measured by a sensor, and sending the signal to a processor.
The fuel-selecting method according to the fourth illustrative embodiment also includes a sixth step of selecting one of a plurality of fuels, based on receipt of the signal by the processor, and may include a final step of dispensing the selected fuel into the vehicle via the fuel filler neck.
For a more complete understanding of the present invention, the reader is referred to the following detailed description section, which should be read in conjunction with the drawings. Throughout the following detailed description and in the drawings, like numbers refer to like parts.
It should be understood that only structures and methodology needed for illustrating selected embodiments of the present invention are described herein. Other conventional structures, and those of ancillary and auxiliary components of the system, will be known and understood by those skilled in the art.
The present invention provides a fuel delivery system configured to automatically select an appropriate fuel for a specific vehicle, out of a plurality of available fuels.
The system hereof may be adapted in large scale by the automotive and fuel industries. Alternatively, the system hereof may be adapted for private use such as in a fleet of privately-owned vehicles which require different fuel blends.
A fuel delivery system 20 according to a first illustrative embodiment of the invention includes a fuel pump assembly 22 including a pump base 24, a hose assembly 10 operatively attached to the pump base, and a nozzle assembly 11 affixed to a distal end of the hose assembly and spaced away from the pump.
The fuel dispenser pump 22 also includes an electronic controller 12 disposed inside of the pump base 24 and configured to select an appropriate fuel, based on at least one signal received from the nozzle assembly 11.
The system 20 hereof is designed to work in conjunction with a series of specialized filler necks, such as the one shown at 13 in
The system 20 according to the present invention includes the following features, some of which may be optional:
A blending chamber (not shown) may be provided in a body 34 of the nozzle assembly 11, where fuel components such as, for example, gasoline and ethanol are mixed, in order to minimize or prevent residual contamination from one refueling to the next.
A key component of the system 20 hereof is that a fuel delivery spout 37, of the nozzle assembly 11, has a spring-loaded slidable collar member 14 disposed on a tip end thereof. A position of the collar member on the nozzle, when used in conjunction with a calibrated fuel filler neck 13 on a vehicle 200 which is configured to work together with the system hereof, is measured by a sensor 31 on the nozzle assembly. The load sensor 31b sends a signal back to the pump base 24, and that signal is used by a control computer 12, disposed in the pump base 24, to select an appropriate grade of fuel for the vehicle 200.
As shown in
The pump nozzle assembly 11 also includes a load sensor 31b, which is adapted to send a signal, corresponding to an amount of movement of the collar member 14 on the nozzle spout 37, to the controller 12 in the pump base 24.
The signal generated by the position of the collar member 14 on the nozzle spout 37 may be transmitted by pneumatic pressure, by hydraulic fluid, by an electronic position sensor which may be either wired or wireless. Optionally, the signal may be transmitted via fiber-optic cable.
This electronic signal is then used to automatically and efficiently determine a suitable fuel blend for that vehicle, out of a plurality of available fuel blends.
If the vehicle 200 requires a specific grade of gasoline or ethanol gasoline blend, the filler neck 13 in the vehicle is designed and configured to displace the collar member 14 on the nozzle spout 37 by a defined distance, corresponding to such grade or type of fuel or fuel blend.
Referring now to
Referring again to
Referring again to
Referring once again to
The displacement distances represented by X, Y and Z correspond to different fuels and/or fuel blends referred to as A, B and C.
A review of the table of
Although the examples described above refer to the use of different ethanol blends, it should be understood that the same system may be modified and adapted to select from regular, midgrade, and premium gasolines, or to select from other fuel choices, as needed.
Once a signal from the sensor is received by the pump computer 12, the pump computer then interprets this signal using preprogrammed software or firmware, and activates only the fuel or fuel blend corresponding to this signal, and deactivates all other fuels.
The vehicle operator is then free to begin pumping fuel into the vehicle 200, without having to manually select the appropriate grade fuel.
Fuel Filler Neck Assembly
One important aspect of this system for determining which fuel should be supplied to each vehicle lies in the design of the vehicle fuel filler neck assembly 13 as illustrated in
A fuel inlet valve, including a spring 47 and door 48, seals the orifice until the appropriate sized nozzle passes through the orifice and opens the door. The fuel inlet valve is attached to a fuel seal plate 49, which holds a circular seal 50 that prevents fuel vapors from escaping from the fuel tank when the fuel inlet valve is open.
When the fuel nozzle spout 37 is inserted in the filler neck assembly 13, it encounters an optional spring-loaded pivoting nozzle guide tab 51. As the nozzle spout 37 moves forward into the filler neck assembly, the tip of the spout is guided to the restrictor orifice 46 by the filler neck restrictor, and a locking flange 43 of the nozzle is guided toward the locking channel 53 by the inclined flange guide 52. The flange 43 eventually reaches the flange stop 54.
A curved slot 44 in the locking flange 43 is engaged by a pin or tooth 55 provided inside of the fuel filler neck 13. The curved slot allows the tooth to lock the entire nozzle assembly in place, even if it is rotated during or after insertion.
Meanwhile, the nozzle guide tab 51 is exerting a downward pressure on the nozzle spout 37, causing the flange 43 to drop into the locking channel. At the same time, the spring 35 is pushing the nozzle flange back, pushing the curved slot into the locking tooth 55, and thereby holding the nozzle in place in the fuel filler neck 13. This locking engagement prevents the spring from pushing the nozzle assembly 11 out of position relative to the fuel filler neck during refueling.
The outside diameter of the sliding collar member 14 is the same as that of today's nozzle spouts (19 mm), but is larger than the diameter of the nozzle spout to enable it to fit slidably thereon. The outside diameter of the sliding collar member 14 is also larger than the restrictor orifice 46 in the fuel filler neck 13 of a vehicle which requires a non-legacy fuel blend.
Because the collar 14 is too large to fit through the orifice, as the spout is pushed through the orifice, the sliding collar member is blocked by the restrictor plate and slides back rearwardly on the spout by a predetermined distance. Thus, once in place, the distance between the orifice of the fuel neck restrictor 45 and the back of the locking channel 53 displaces the sliding collar member 14 a precise amount, depending upon the location of the fuel neck restrictor within the fuel neck 56.
A signal, corresponding to the distance which the collar member is displaced, is then generated and sent to the control computer 12, thus activating a selection of the right fuel, in the fuel dispenser pump, for that specific vehicle.
System Operation
A motorist choosing to refuel a vehicle 200 will insert the nozzle spout 37 of the dispensing nozzle assembly 11 into the fuel filler neck 13 of the vehicle. If the orifice 46 formed in a restrictor 45 (see
An algorithm in the fuel dispenser pump control computer 12 recognizes, from receipt of the first signal, that this vehicle is an older vehicle not equipped with a fuel filler neck designed to activate the selective dispensing nozzle system. The dispensing computer will then either automatically select, or will allow the motorist to select whatever fuels are appropriate for older vehicles, such as, for example, a blend of 10 percent ethanol and gasoline.
If, however, the vehicle being refueled is a newer model that requires a specific fuel, then the diameter of the opening in the restrictor plate will be smaller than the collar member diameter, but larger than the diameter of the nozzle spout. Thus, when the nozzle is inserted into the filler neck, the sliding collar member 14 will be displaced rearwardly, on the nozzle spout 37, by a specified distance corresponding to a fuel blend needed for that vehicle.
A spring-loaded pivoting nozzle guide tab 51 (
When the nozzle is correctly positioned, the sensor 31 will generate signal corresponding to the specified distance, and the dispensing computer 12 will select and activate fuel or fuel blend combination A, B or C. When this occurs, the motorist can begin the refueling process.
In the event that the fuel designator A, B or C represents multiple fuels and a choice between these fuels must be made, an algorithm in the dispensing computer will automatically select the lowest cost fuel, unless the motorist manually overrides this selection.
Method
The present invention also contemplates a method of selecting a fuel or fuel blend to be dispensed into a vehicle. Steps in the method hereof are illustrated in
The method according to the invention includes a first step of inserting a nozzle 11 of a dispensing pump 22 into a fuel filler neck 13 of a vehicle 200 having a restrictor member 45 therein with a orifice 46 formed in the restrictor member, and placing a tip portion of the nozzle into the orifice 46, whereby a collar 14 on the nozzle tip is displaced by a specified distance. This step is shown at 82 in the flowchart of
The method according to the invention includes another step of sensing a distance which the collar 14 on the nozzle tip has moved on the fuel filler neck using a sensor 31b, and generating a signal based on a distance that the collar 14 has been displaced. This step is shown at 84 in the flowchart of
The method according to the invention includes another step of sending the signal to a processor. This step is shown at 86 in the flowchart of
The method according to the invention includes another step of evaluating the signal in the processor to determine an appropriate fuel or fuel blend for the vehicle 200, and selecting one of a plurality of fuel or fuel blends based on the signal received by the processor. This step is shown at 88 in the flowchart of
The method according to the invention includes a final step of dispensing the selected fuel or fuel blend into the vehicle 200 through the nozzle 37. This step is shown at 90 in the flowchart of
A fuel delivery system 120 according to a second illustrative embodiment of the invention includes a fuel dispenser pump 122 including a pump base 124, a hose assembly 110 operatively attached to the pump base, and a nozzle assembly 111 affixed to a distal end of the hose assembly.
The system 120 hereof is designed to work in conjunction with a series of specialized filler necks, such as the one shown at 13 in
A key component of the system 120 hereof is that a fuel-delivering nozzle spout 137 of the nozzle assembly 111, has a spring-loaded slidable collar member 114 disposed on a tip end thereof, and a position of the collar member on the nozzle, when used in conjunction with a calibrated fuel filler neck 13 on a vehicle 200 which is configured to work with the system hereof, is read by a sensor which sends a signal back to the pump base 124, and that signal is used to select an appropriate fuel for the vehicle, by a control computer 112 disposed in the pump base 124.
The signal, generated by the position of the collar 114 when the nozzle spout 137 is inserted into the filler neck 113, may be transmitted by pneumatic pressure or hydraulic fluid, or by an electronic position sensor which may be wired or wireless. Optionally, the signal may be transmitted via fiber-optic cable.
This electronic signal is then used to automatically and efficiently determine the proper fuel or fuel blend for that vehicle, out of a plurality of available fuels.
If a vehicle requires the use of a specific grade of gasoline or ethanol gasoline blend, the filler neck 13 is designed and configured to displace the collar member 114 on the nozzle spout 137 by a defined distance corresponding to such grade or type of fuel.
Where the signal is sent via air pressure, this displacement of the slidable collar member 114 causes the venting of one or more air pressure lines, which causes an associated air pressure switch, in the fuel dispenser pump, to deactivate an electrical line leading to the pump computer. The pump computer then interprets this signal, and activates only the fuel or fuel blend corresponding to this signal, and deactivates all other fuels. The vehicle operator is then free to begin pumping fuel without having to manually select the appropriate grade fuel.
In the second embodiment of the invention, in which the signal is sent via compressed air, the fuel dispenser pump 122 further includes a connector 130 for connecting to a source of pressurized air, which may either be a source external to the fuel dispenser pump 122, or alternatively, may be a compact compressor 132 housed inside of the pump base 124.
The fuel dispenser pump 122 also includes an electronic controller 112 configured to select an appropriate fuel, based on at least one signal received from the nozzle assembly 111.
In the depicted embodiment, the fuel dispenser pump additionally includes a signal converter 136, disposed inside of the pump base 124, for converting pneumatic signals to electronic signals. The signal converter 103 will be described in detail subsequently.
An overview of the system according to the second embodiment is shown in
Each of the variable pressure chambers 104, 105 has a vent line 108 and 109 that runs along the dispenser hose assembly 110 to the selective dispensing nozzle 111. Also, each variable pressure chamber 104, 105 is equipped with a low air pressure sensor 106 and 107 that closes and opens circuits depending on whether the variable pressure chambers are pressurized or vented. The circuits from the low air pressure sensors are wired or programmed into the fuel dispenser pump's control computer 112, which then selects the fuel or fuels that are acceptable in that particular vehicle.
The vent lines 108, 109 run from the signal converter 103 in the fuel dispenser pump 122 to the dispensing nozzle assembly 111, and are eventually sealed by a sliding collar member 114 on the nozzle spout 137. Small vent openings in this collar member 114 will vent either or both of the vent lines if the collar member is forced to slide back on the spout.
A motorist choosing to refuel their vehicle will insert the selective dispensing nozzle 137 into the fuel filler neck 13 of their vehicle. If the restrictor plate 48 inside the fuel filler neck has a diameter larger than that of the sliding collar member, the collar member will pass through the restrictor plate without moving. As a result, neither one of the variable air pressure chambers 104, 105 is depressurized, and both circuits remain closed. An algorithm in the fuel dispenser pump control computer 112 recognizes that this vehicle is an older vehicle not equipped with a fuel filler neck designed to activate the selective dispensing nozzle system. The dispensing computer will then allow the motorist to select whatever fuels are appropriate for older vehicles.
If, however, the vehicle being refueled is a model that requires specific fuels, then the diameter of the opening in the restrictor plate will be smaller than the collar member diameter but larger than the diameter of the nozzle spout. Thus, when the nozzle is inserted into the filler neck, the sliding collar member will be displaced back until an opening in the collar member aligns with the end of a vent line. When this occurs, one or both of the variable pressure chambers will be depressurized. Based on which vent lines are depressurized, the dispensing computer will select and activate either fuel or fuel combination A, B or C. When this occurs, the motorist can begin the refueling process. In the event that the fuel designator A, B or C represents multiple fuels, an algorithm in the dispensing computer will automatically select the lowest cost fuel, unless the motorist manually overrides this selection.
Signal Converter
The signal converter 103 is shown in
Coming out of each variable pressure chamber is a respective air pressure vent line 108 and 109 that runs down the dispenser hose assembly 110 and through the dispenser nozzle assembly 111 to the nozzle spout 137. A sliding collar member 114 on the spout 137 either keeps the end of the air line sealed, or vents it to the atmosphere, depending on how far along the axis of the nozzle spout the collar member is displaced.
Since the diameter of the air line is larger than the diameter of the orifice 117 and 118, when the air line is vented, more air leaves the variable pressure chamber through the air line than the orifice will allow in. As a result, the air pressure in the variable pressure chamber will drop to nearly atmospheric.
Attached to each variable pressure chamber is a commercially available low air pressure sensor for example, such sensors are used in truck air brake systems. A typical air sensor is shown in
In the same way, when the air pressure in the variable pressure chamber approaches atmospheric, the circuit opens and the fuel dispenser pump control computer calculates which fuel or fuels are acceptable for the vehicle being refueled.
Referring also to
A key component of the system 120 is that a fuel delivery nozzle 137 has a spring-loaded slidable collar member 114 on a tip end thereof, and a position of the collar member, when used in conjunction with a calibrated fuel filler neck 13 on a vehicle 200 which is configured to work with the system hereof, sends a pneumatic signal which is used to automatically and efficiently determine the proper fuel or fuel blend for that vehicle, out of a plurality of available fuels.
Dispenser Hose Assembly
The dispenser hose assembly 110, shown in
Nozzle Handle to Nozzle Spout Connections
The nozzle air pressure lines could be a combination of flexible lines, metal lines and passages within the body of the nozzle itself.
Ultimately, the nozzle air pressure lines connect with the spout air pressure lines 132 that are internal to the nozzle spout itself.
Nozzle Spout
Two air pressure lines 132a & 132b are inside the nozzle spout and exit the spout beneath the collar member 114. When the exit of either or both air pressure lines 132a, 132b are covered by a solid part of the sliding collar member, the line is effectively sealed and pressurized.
The collar member spring 135, extending between the collar member and a locking flange 143, exerts a force on the collar member away from the flange. During assembly of the nozzle spout 137, the collar member spring 135 is placed on the spout followed by a collar core 114a. the collar core has a network of slots that, when the collar cover 114b is attached, form vent channels. The central channel 136 runs parallel to the centerline of the nozzle spout to a vent hole 142 in the collar cover. Four connecting vent channels (138, 139, 140, 141) run perpendicular to the central channel. The collar core 114a is forced back compressing the spring 135 until the guide channels in the collar core 114a align with the holes in the side of nozzle spout 137 in which the restraint pins 114p are inserted.
These pins then prevent the collar member from being forced off the spout. When the collar core 114a is in position, the collar cover 114b is pressed over the core and the vent opening 142 in the collar cover is aligned over the central vent channel 136 in the collar cover 144b. The combined assembly is called the sliding collar 114.
When the nozzle spout 137 is inserted into the corresponding fuel filler neck 13 of a vehicle, the sliding collar member 114, which slides on the nozzle spout 137 through which the fuel flows into the vehicle, is displaced a discrete distance that corresponds to the fuel requirements of the vehicle. The collar member displacement will cause one or more of four vent passages 138-141 in the collar core to align with the open end of either or both of the air pressure lines, causing that line or lines to vent to atmosphere. When this occurs, the air pressure throughout the line or lines drops to zero. At the same time, the low air pressure switches in the dispensing pump sense the pressure drop, opening electrical circuits connecting the low air pressure switches to the dispensing pump control computer. The opened circuits are detected by an algorithm in the computer software which then selects the fuel that is appropriate for that vehicle.
A curved slot 144 in the locking flange 143 is engaged by a tooth provided inside of the fuel filler neck assembly 13. The curved slot allows the tooth to lock the entire nozzle assembly in place even if it is rotated upon insertion.
Fuel Filler Neck Assembly
One important aspect of this system for determining which fuel should be supplied to each vehicle lies in the design of the vehicle fuel filler neck assembly 13 as illustrated in
When the fuel nozzle spout 137 is inserted in the filler neck assembly 13, it encounters an optional spring-loaded pivoting nozzle guide tab 51. As the nozzle spout 137 moves forward into the filler neck assembly, the tip of the spout is guided to the restrictor orifice 46 by the filler neck restrictor, and the locking flange 143 of the nozzle is guided toward the locking channel 53 by the inclined flange guide 52. The flange eventually reaches the flange stop 54. Meanwhile, the nozzle guide tab 51 is exerting a downward pressure on the nozzle spout 137, causing the flange to drop into the locking channel. At the same time, the collar member spring 35 is pushing the nozzle flange back, pushing the curved slot into the locking pin or tooth 55, and thereby holding the nozzle in place in the fuel filler neck 13.
The outside diameter of the sliding collar member 114 is that of today's nozzle spouts (19 mm), but larger than the diameter of the nozzle spout and restrictor orifice in this design. Therefore, as the spout is pushed through the orifice, the sliding collar member is blocked by the restrictor plate and slides back on the spout. Thus, once in place, the distance between the orifice of the fuel neck restrictor 45 and the back of the locking channel 53 displaces the sliding collar member 114 a precise amount, depending upon the location of the fuel neck restrictor within the fuel neck 56. Depending on how far back the collar member is displaced, one or both of the air pressure lines are vented to atmosphere and the air pressure the vented line or lines drops to zero, thus activating the low air pressure switches in the fuel dispenser pump.
The three different displacements of the filler neck restrictor and the locking channel are referred to in this document as X, Y and Z. X, Y and Z correspond to different fuels and/or fuel blends referred to as A, B and C.
System Operation
When the owner of a vehicle not designed with a special fuel filler neck assembly a legacy vehicle, the collar member spring exerts enough force to keep the sliding collar member from moving as the nozzle is inserted into the vehicle, as shown in
Since the slide collar member is not displaced, neither air pressure line is lined up with a vent channel in the collar member; therefore, the lines are sealed and pressurized.
Because both lines are pressurized, both low air pressure switches in the pump are in the closed position, and the dispensing pump computer recognizes this as signifying a legacy vehicle, and this allows the person doing the refueling to select from those fuels that the vehicle is capable of running on.
If the vehicle is a new vehicle designed to operate on a specific fuel and the fuel neck restrictor, seal plate and fuel valve are at the maximum possible depth inside the filler neck assembly, then the distance from the restrictor orifice and back of the locking channel will be at dimension X, this displacing the sliding collar member back just enough to vent air pressure line 132b through vent channel 140. Air pressure switch 107 at the fuel dispenser pump opens and the fuel dispenser pump computer activates the fuel or fuel blend called fuel “A”, which is best suited for the vehicle. Thus, a person with this type of vehicle is freed from the task of selecting a fuel before beginning the refueling process.
Precision Blending System
Some of the alternative high octane fuels under consideration involve adding more ethanol to the regular grade gasoline, which is typically already 10% ethanol. If higher ethanol or other non-petroleum fuels are blended with gasoline and those blends are to be sold through the same hose and nozzle as today's regular and premium, as consumers today expect, an additional feature would need to be added to the hose assembly—precision blending system. This system ensures that the concentration of the ethanol or other non-petroleum fuel in the fuel pumped into the car is unaffected by the residual fuel in the hose from the previous refueling event. The system is illustrated in
The hose assembly shown in
At the nozzle end of the hose assembly shown in
At the fuel dispenser pump, the smaller ethanol (or other fuel) line exits the pump hose and then runs to the flow valve, flow meter and ethanol pump.
Although the present invention has been described herein with respect to a number of specific embodiments, the foregoing description is intended to illustrate, rather than to limit the invention. Those skilled in the art will realize that many modifications of the disclosed embodiments could be made which would be operable. All such modifications, which are within the scope of the claims, are intended to be within the scope and spirit of the present invention.
The present application claims priority under 35 USC 119(e) to U.S. Provisional Patent application 62/899,295, filed Sep. 12, 2019. The entire disclosure of the referenced priority application, including specification, claims and drawings, is incorporated by reference herein.
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