Adaptive method to control fuel delivery injector with modeling uncertainties in a fuel cell system
AssigneeGM Global Technology Operations LLC
InventorsPatrick Frost, Darrell W. Burleigh, Daniel C. Di Fiore
Life of this patent
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Abstract
A method for adaptively controlling a fuel delivery injector in a fuel cell system, including determining a feed-forward bias for the fuel delivery injector, determining an injector flow set-point for the fuel delivery injector, monitoring stack current, determining a transient pressure correction for the stack and correcting the injector flow set-point.
Claims18
A method for adaptively controlling a fuel delivery injector that delivers hydrogen fuel to a fuel cell stack in a fuel cell system, said method comprising:
- determining a feed-forward flow bias for the fuel delivery injector by monitoring stack current and determining valve losses and a transient pressure correction in the fuel cell stack;
- determining a flow set-point for the injector;
- correcting the flow set-point of the injector to determine a corrected flow set-point;
- determining a maximum flow rate for the injector;
- determining a duty cycle of the injector based on the corrected flow set-point and the maximum flow rate;
- and
- using the duty cycle to control the injector to inject fuel into the fuel cell stack.
A method for adaptively controlling a fuel delivery injector that delivers hydrogen fuel to a fuel cell stack in a fuel cell system, said method comprising:
- determining a feed-forward flow bias for the fuel delivery injector by monitoring stack current and determining valve losses and a transient pressure correction in the fuel cell stack;
- determining an injector flow set-point for the fuel delivery injector;
- monitoring stack current in the fuel cell system;
- determining a transient pressure correction for the fuel cell stack;
- and
- correcting the injector flow set-point.
A method for adaptively controlling a fuel delivery injector that delivers hydrogen fuel to a fuel cell stack of a fuel cell system in a vehicle, said method comprising:
- determining a feed-forward flow bias by monitoring current of a fuel cell stack, and determining valve losses and a transient pressure correction in the fuel cell stack;
- determining a flow set-point of the fuel delivery injector by comparing the feed-forward flow bias with a pressure set-point and pressure feedback from the fuel cell stack;
- correcting the flow set-point of the fuel delivery injector to determine a corrected flow set-point by comparing the determined injector flow set-point to the hydrogen consumption of the fuel cell stack and the transient pressure correction of the stack, wherein the flow set-point is adjusted to match the hydrogen consumption and the transient pressure correction of the stack when all of the anode valves are closed;
- storing a scaling factor of the flow set-point in bins;
- creating a corrected injector flow that is passed on to an injector duty cycle determination;
- determining a maximum flow rate for the injector using the maximum flow coefficient for the injector, the pressure of the hydrogen supply, and the temperature of the hydrogen supply;
- determining the duty cycle of the fuel delivery injector based on the corrected flow set-point and the maximum flow rate for the injector;
- and
- using the duty cycle to control the injector to inject fuel into the fuel cell stack.
Dependencies are inferred from the claim text.