Patent ID: 7404397

Claim:
A method of modifying the operation of one or more fuel injectors of an internal combustion engine based upon differences in fuel supplied to the engine, the engine having an engine control unit with a primary fuel injector control, at least one oxygen sensor providing exhaust gas oxygen content information to the engine control unit and an onboard diagnostic information port, comprising: providing a fuel injector control modification module comprising a secondary fuel injector control configured to generate fuel injector control signals; providing a communication link between said fuel injector control modification module and said onboard diagnostic information port; providing information indirectly indicative of a fuel being provided to said engine in the form of processed exhaust gas oxygen content information received by said fuel injector control modification module from said engine control unit through said onboard diagnostic information port via said communication link; and controlling the operation of said one or more fuel injectors at one or more times with fuel injector control signals generated by said secondary fuel injector control based upon the information indicative of the fuel being provided to said engine.