Hydrogen fueling systems and methods
According to aspects, hydrogen fueling systems and methods are provided, including vehicle-to-vehicle communication techniques, hydrogen cooling techniques and/or hydrogen dispenser control techniques that facilitate improving aspects of a hydrogen fueling station.
1. A hydrogen gas dispenser configured to receive hydrogen gas from a hydrogen gas supply and provide the hydrogen gas to a fuel tank of a vehicle during a fueling event, the hydrogen gas dispenser comprising:
at least one nozzle configured to engage with the fuel tank to dispense hydrogen gas to the fuel tank during the fueling event;
a variable-size valve comprising a valve stem that when rotated changes a size of the valve opening, the variable-size valve coupled to receive hydrogen gas from the hydrogen gas supply such that changing the size of the valve opening results in a change in a flow rate of hydrogen gas passing through the valve opening;
a direct drive servo motor coupled to the valve stem of the variable-size valve, the direct drive servo motor configured to rotate the valve stem to change the size of the valve opening, wherein one rotation of the direct drive servo motor results in one rotation of the valve stem; and
a dispenser controller coupled to the direct drive servo motor and configured to cause the direct drive servo motor to rotate to change the size of the valve opening to provide hydrogen gas at desired flow rates based on target pressures and/or target flow rates during the fueling event.
2. The hydrogen gas dispenser of claim 1 , wherein the dispenser controller is configured to receive as input:
a supply pressure of hydrogen from the hydrogen gas supply;
a measured pressure downstream of the variable-size valve and/or a tank pressure of hydrogen gas in the fuel tank; and
a target pressure and/or target flow rate at which it is desired that the at least one nozzle provide hydrogen gas to the fuel tank, wherein the dispenser controller is configured to cause the direct drive servo motor to rotate to change the size of the valve opening based on the input.
3. The hydrogen gas dispenser of claim 2 , further comprising an encoder configured to measure a number of degrees of rotation the variable-size valve has been opened.
4. The hydrogen gas dispenser of claim 3 , wherein the encoder is capable of measuring the number of degrees of rotation at a resolution of less than one degree and greater than or equal to a tenth of a degree.
5. The hydrogen gas dispenser of claim 3 , wherein the encoder is capable of measuring the number of degrees of rotation at a resolution of less than a half of a degree and greater than or equal to a tenth of a degree.
6. The hydrogen gas dispenser of claim 3 , wherein the encoder is capable of measuring the number of degrees of rotation at a resolution of less than a third of a degree and greater than or equal to a tenth of a degree.
7. The hydrogen gas dispenser of claim 3 , wherein the encoder is capable of measuring the number of degrees of rotation at a resolution of approximately a tenth of a degree.
8. The hydrogen gas dispenser of claim 3 , wherein the input received by the dispenser controller includes the measurement from the encoder to determine a current size of the valve opening.
9. The hydrogen gas dispenser of claim 2 , wherein the input received by the dispenser controller includes a pressure profile that provides target pressures over a duration of the fueling event, and wherein the dispenser controller is configured to cause the direct drive servo motor to rotate to change the size of the valve opening to a size that results in flow rates that cause the measured pressure and/or the tank pressure to follow the pressure profile.
10. The hydrogen gas dispenser of claim 1 , wherein the hydrogen gas dispenser is coupled to an upstream hydrogen gas cooling system configured to provide chilled hydrogen gas to the fuel tank of the vehicle during the fueling event, the hydrogen gas cooling system coupled to the hydrogen gas dispenser to provide the chilled hydrogen gas as input to the variable-size valve.
11. The hydrogen gas dispenser of claim 1 , wherein the hydrogen gas dispenser is coupled to a downstream hydrogen gas cooling system configured to provide chilled hydrogen gas to the fuel tank of the vehicle during the fueling event, the hydrogen gas cooling system coupled to the hydrogen gas dispenser so that hydrogen gas passing through the variable-size valve is provided to the hydrogen cooling system.
12. A method of dispensing hydrogen gas to a fuel tank of a vehicle during a fueling event via a variable-size valve comprising a valve stem that when rotated changes a size of the valve opening to change a flow rate of hydrogen gas passing through the valve opening, the valve stem coupled to a direct drive servo motor configured to rotate the valve stem to change the size of the valve opening, wherein one rotation of the direct drive servo motor results in one rotation of the valve stem, the method comprising:
receiving hydrogen gas from a hydrogen gas supply;
receiving as a first input:
a supply pressure of hydrogen from the hydrogen gas supply; and
a measured pressure downstream of the variable size valve and/or a tank pressure of hydrogen gas in the fuel tank;
receiving input indicative of a current size of the valve opening;
determining a target size of the valve opening that results in a target pressure and/or target flow rate at which it is desired to provide hydrogen gas to the fuel tank based at least in part on the first input and the first value; and
rotating the valve stem to change the current size of the valve opening to the target size.
13. The method of claim 12 , wherein receiving the input comprises receiving a measurement from an encoder.
14. The method of claim 13 , wherein the measurement indicates a number of degrees the valve stem has been rotated.
15. The method of claim 14 , wherein the measurement indicates the number of degrees at a resolution less than one degree of rotation and greater than or equal to a tenth of a degree of rotation.
16. The method of claim 14 , wherein the measurement indicates the number of degrees at a resolution less than a half a degree of rotation and greater than or equal to a tenth of a degree of rotation.
17. The method of claim 14 , further comprising determining the current size of the valve opening based on the measurement.
18. The method of claim 12 , further comprising receiving the target pressure and/or the target flow rate at which it is desired to provide hydrogen gas to the fuel tank.
19. The method of claim 12 , further comprising:
receiving a pressure profile that provides desired target pressures over a duration of the fueling event; and
determining the target pressure from the pressure profile.
20. The method of claim 12 , further comprising:
dispensing the hydrogen gas flowing through the valve opening to the fuel tank of the vehicle; and
cooling the hydrogen gas prior to dispensing.