Patent ID: 11913392
Assignee: CUMMINS INC.
Field: Measurement (Instruments)
Classification: CPC F  G | IPC F

Claim 6:
7. A control system for a natural gas engine, comprising:
a processor coupled to an input and an output, wherein the input is adapted to receive a first characteristic of a natural gas fuel supplied to a plurality of natural gas engines, detected by a first analyzer disposed upstream of a fuel inlet of each of the plurality of natural gas engines wherein the first characteristic includes identification of a plurality of components of the natural gas fuel, and a second characteristic of the fuel detected by a second analyzer disposed downstream of the fuel inlet to the natural gas engine wherein the second characteristic includes a concentration of one or more of the identified components of the natural gas fuel determined by the first analyzer, the output is adapted to provide a control command to the natural gas engine, wherein the processor is configured to:
determine a fuel flow value for the natural gas engine in response to an air-fuel ratio target and a mass air flow to the natural gas engine;
estimate an air-fuel ratio based on the identification of the plurality of components of the natural gas fuel from the first analyzer and the concentration of the at least one of the plurality of components of the natural gas fuel from the mid-infrared analyzer;
determine a fuel flow correction value based on the fuel flow value and the estimate of the air-fuel ratio; and
provide the control command to the output as a total fuel flow command based on the fuel flow value and the fuel flow correction value.