Patent ID: 11879388
Assignee: RTX CORPORATION
Field: Measurement (Instruments)
Classification: CPC F  G  Y | IPC F

Claim 0:
1. A method for monitoring fuel additives on board a vehicle, comprising:
flowing fuel from a fuel tank along a fuel line to an engine;
sensing concentration of additives in the fuel at a point along the fuel line;
comparing the concentration of the additive in the fuel to a fuel additive specification;
determining that the concentration is less than the specification;
operating a flow control device to divert a portion of the fuel from the fuel line along a parallel line to a fuel additive dispenser and back to the fuel line;
determining that the concentration meets the specification; and
operating the flow control device to bypass the fuel additive dispenser, wherein the fuel additive dispenser is a passive fuel additive dosing system which comprises a cartridge; a membrane-based contactor within the cartridge; a fuel inlet to the cartridge connected to receive diverted flow from the flow control device; a fuel outlet from the cartridge connected to return flow back to the fuel line; and an additive within the membrane-based contactor, the membrane-based contactor being arranged in the cartridge such that, with fuel in the cartridge, a fuel contact area with the membrane-based contactor is dependent on a fuel flow rate to passively dispense a proportional amount of the additive into the fuel.