METHOD AND SYSTEM FOR CONTROLLING USAGE OF NATURAL GAS AND LOW BTU GASEOUS FUELS IN SPARK IGNITED ENGINES

摘要

A method is provided for controlling a spark-ignited engine in response to variations in quality of a gaseous fuel provided to the engine. The method comprises receiving a fuel energy value representing a quality of the fuel, determining whether the fuel energy value is sufficiently changed relative to one of an earlier fuel energy value and an expected fuel energy value, responding to a fuel energy value that is sufficiently changed relative to one of an earlier fuel energy value and an expected fuel energy value by accessing control values from a memory, computing adjustment commands for operational components of the engine using the control values, and controlling the operational parameters of the engine using the adjustment commands.