US20100180983A1 - Fueling system and method - Google Patents

Abstract

A fuel storage system includes a fuel tank, a fueling receptacle in fluid communication with the tank, and a coil adjacent the fueling receptacle. The system also includes a controller configured to determine information about a state of fuel in the tank, and to cause a modulated current to be driven into the coil to generate an electromagnetic field. The modulated current represents the information about the state of fuel in the tank.

Description

BACKGROUND
• 1. Field
• The invention relates to fueling systems and methods.
• 2. Discussion
• Modulation may be described as the process of varying a periodic waveform in order to use that signal to convey a message. Analog modulation uses a high-frequency sinusoid waveform as its carrier signal. Certain parameters of that sine wave, e.g., amplitude, phase and frequency, may be modified in accordance with a low frequency information signal to obtain the modulated signal. Digital modulation also uses a high-frequency sine wave as its carrier signal. The wave parameters, however, are modified in a discrete manner.
• A device that performs modulation may be referred to as a modulator and a device that performs the inverse operation of modulation may be referred to as a demodulator. A device that can do both operations may be referred to as a modem.
SUMMARY
• A fuel storage system includes a fuel tank, a fueling receptacle in fluid communication with the tank, and a coil adjacent the fueling receptacle. The system also includes a controller configured to determine information about a state of fuel in the tank and to cause a modulated current to be driven into the coil to generate an electromagnetic field. The modulated current represents the information about the state of fuel in the tank.
• An automotive fuel storage system includes a tank, a fueling port in fluid communication with the tank, a coil wrapped around the fueling port and a sensor configured to sense a condition of fuel in the tank. The fuel storage system also includes a controller configured to drive a modulated current into the coil based on the condition of the fuel to generate an electromagnetic field.
• A method for refueling an automotive vehicle includes, while receiving fuel into a fueling receptacle in fluid communication with a tank, (i) determining information about a state of fuel in the tank and (ii) driving a modulated current into a coil surrounding the fueling receptacle based on the information to generate an electromagnetic field.
• While example embodiments in accordance with the invention are illustrated and disclosed, such disclosure should not be construed to limit the invention. It is anticipated that various modifications and alternative designs may be made without departing from the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWING
• FIG. 1 is a schematic diagram of an embodiment of an automotive fueling system.
DETAILED DESCRIPTION
• To minimize refueling times associated with a fuel cell vehicle, it may be desirable to quickly fill the vehicle's on-board fuel storage vessel. The time it takes to fill the storage vessel depends on the flow rate at which fuel is provided to the storage vessel (and the amount of fuel already in the vessel at the time of refueling).
• It is known that a temperature of the fuel in the storage vessel during refueling is related to a flow rate (and duration) at which fuel is provided to the storage vessel. It is also known that certain storage vessels are rated for certain recommended maximum temperatures. For example, a storage vessel may be designed to provide pressurized storage of a gaseous fuel at maximum storage vessel temperatures less than 85 degrees Celsius.
• The temperature at which fuel is provided to a storage vessel is typically less than the rated temperature of the storage vessel. The rated temperature of the storage vessel may thus limit the flow rate at which fuel is provided to the storage vessel.
• During certain refueling operations, the temperature of the fuel inside the storage vessel may exceed the temperature of the storage vessel itself (provided the temperature of the storage vessel itself is less than its temperature rated limit.) For example, if the temperature of the storage vessel is 30 degrees Celsius before a refueling operation, the fuel may be provided to the storage vessel at relatively high flow rates to minimize refueling times and thus yield fuel temperatures inside the storage vessel significantly greater than 30 degrees Celsius. Such refueling strategies may require the fuel temperature, flow rate, etc., to be monitored to prevent exceeding the storage vessel rated temperature. This information may be communicated to a fueling station so that the fueling station may provide the fuel under conditions that minimize refueling times and avoid exceeding the storage vessel rated temperature.
• Referring now toFIG. 1, a hydrogenfuel cell vehicle10 includes ahydrogen storage tank12,hydrogen port14 andcoil16. Thetank12 andport14 are fluidly connected via afuel line18. In the embodiment ofFIG. 1, thecoil16, e.g., 30-gauge enameled copper magnet wire, is wrapped 50 times around theport14. Of course, any suitable wire and/or winding scheme may be used. In other embodiments, thecoil16 may surround theport14 and reside within/on a port housing (not shown). For example, thecoil16 may be wrapped around a sleeve (not shown) that is fitted over theport14. Other configurations are also possible. For example, thecoil16 may be disposed on a plate (not shown) adjacent theport14, etc.
• Thevehicle10 also includes acontroller20,modulator22 andsensors24,26. Themodulator22 ofFIG. 1 is integrated with thecontroller20. In other embodiments, however, themodulator22 may be separate from thecontroller20. Thecontroller20 is in communication with thesensors24,26. Themodulator22 is electrically connected with thecoil16. (Of course, the elements ofFIG. 1 need not be located in thevehicle10 and may, for example, comprise a stand alone fuel system.)
• Thesensors24,26 illustrated inFIG. 1 detect, respectively, a pressure and temperature of fuel within thetank12. Other and/or different sensors, however, may be used. Thecontroller20 may read thesensors24,26 to determine the pressure and temperature of the fuel in thetank12. Based on these readings, thecontroller20 may transmit information regarding the temperature and pressure of the fuel to themodulator22. Themodulator22 may vary current flowing into thecoil16 according to the information. As apparent to those of ordinary skill, this modulated current flow through thecoil16 will generate an electromagnetic field that is concentrated by the port14 (provided theport14 is made of material with magnetic permeability).
• Ahydrogen fueling station28 includes ahydrogen storage tank30,hydrogen nozzle32 andcoil34. Thetank30 andnozzle32 are fluidly connected via afuel line36. Thecoil34, e.g., 30-gauge enameled copper magnet wire, illustrated inFIG. 1 is wrapped 50-times around anend portion38 of thenozzle32. (Thecoils16,34 ofFIG. 1 are wound so as to share the same axis.) Any suitable wire and/or winding configuration/position, however, may be used.
• Thestation28 also includes acontroller40 anddemodulator42. Thecontroller40 is configured to control avalve44 in thefuel line36. The demodulator is electrically connected with thecoil34 and in communication with thecontroller40.
• During a refueling operation, theend portion38 of thenozzle32 may be placed over (and secured to) theport14 to establish a fluid pathway between thetank30 of thestation28 and thetank12 of thevehicle10. As discussed above, thecontroller20 may continuously, periodically, etc. read the temperature, pressure, capacity, etc. of fuel in thetank12 and encode this information into a current driven into thecoil16. With theend portion38 in contact with theport14, the electromagnetic field generated from the current flow through thecoil16 may permeate into theend portion38 of the nozzle32 (provided theend portion38 is made of material with magnetic permeability).
• As discussed above, the flow of current within thecoil16 generates an electromagnetic field. A change in this electromagnetic field may induce current flow in thecoil34. Without another change in the electromagnetic field, however, the current flow in thecoil34 will eventually decay due to the coil's internal resistance. Thus, to continue to induce current flow in thecoil34, the current in thecoil16 should change repeatedly to generate a changing electromagnetic field. By changing the current in thecoil16 according to, for example, a periodic waveform and modulating this waveform with encoded information, thecoil34 may be induced with current having a similar waveform. Demodulating the waveform may reproduce the encoded information.
• Pulse modulation may be used in conjunction with the embodiment ofFIG. 1. Any suitable modulation scheme, however, may be used. The pulses may be shaped similar to impulse responses of a slightly over-damped system. This may help reduce electromagnetic energy from radiating further than intended—thus avoiding turningport14, for example, into a directional radio transmitter.
• With information encoded in a stream of digital data, every transition from ‘0’ to ‘1’ generates an ‘up’ or positive pulse and every transition from ‘1’ to ‘0’ generates a ‘down’ or negative pulse. The ‘up’ pulse and ‘down’ pulse may be identical in shape but of opposite polarity—a mirror image along the time axis.
• As discussed above, a change in the electromagnetic field experienced by theend portion38 induces current flow in thecoil34. Thedemodulator42 may translate the current flow through thecoil34 into information to be decoded by thecontroller40. Based on the decoded information, e.g., temperature, pressure, capacity, etc. regarding the fuel in thetank12, thecontroller40 may control, for example, the flow rate of the hydrogen dispensed from thetank30, via thevalve44, to minimize refueling time and avoid exceeding a rated temperature of thetank12.
• While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. The words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.

Claims (19)

1. A fuel storage system comprising:

a fuel tank;

a fueling receptacle in fluid communication with the tank;

a coil adjacent the fueling receptacle; and

a controller configured to determine information about a state of fuel in the tank and to cause a modulated current to be driven into the coil to generate an electromagnetic field, the modulated current representing the information about the state of fuel in the tank.

2. The system ofclaim 1 wherein the fueling receptacle concentrates the electromagnetic field.

3. The system ofclaim 1 wherein the state comprises a pressure in the tank.

4. The system ofclaim 3 further comprising a pressure sensor configured to sense the pressure in the tank.

5. The system ofclaim 1 wherein the state comprises a temperature in the tank.

6. The system ofclaim 5 further comprising a temperature sensor configured to sense the temperature in the tank.

7. The system ofclaim 1 wherein the electromagnetic field is capable of inducing a current flow in another coil.

8. An automotive fuel storage system comprising:

a tank;

a fueling port in fluid communication with the tank;

a coil wrapped around the fueling port;

a sensor configured to sense a condition of fuel in the tank; and

a controller configured to drive a modulated current into the coil based on the condition of the fuel to generate an electromagnetic field.

9. The system ofclaim 9 wherein the fueling port concentrates the electromagnetic field.

10. The system ofclaim 9 wherein the condition comprises a pressure of the fuel in the tank.

11. The system ofclaim 9 wherein the condition comprises a temperature of the fuel in the tank.

12. The system ofclaim 9 wherein the sensor comprises a pressure sensor.

13. The system ofclaim 9 wherein the sensor comprises a temperature sensor.

14. The system ofclaim 9 wherein the electromagnetic field is capable of inducing a current flow in another coil.

15. A method for refueling an automotive vehicle comprising:

while receiving fuel into a fueling receptacle in fluid communication with a tank, (i) determining information about a state of fuel in the tank and (ii) driving a modulated current into a coil surrounding the fueling receptacle based on the information to generate an electromagnetic field.

16. The method ofclaim 15 wherein determining information about a state of fuel in a tank includes sensing the state of fuel in the tank.

17. The method ofclaim 15 wherein the state comprise a temperature.

18. The method ofclaim 15 wherein the state comprises a pressure.

19. The system ofclaim 1 wherein the coil surrounds the fueling receptacle.

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