Patent ID: 7292930

Claim:
An internal combustion engine comprising: a fueling system for fueling the engine in accordance with a data value for desired engine fueling; and a control system for processing various data to develop data for control of various engine functions including data values for desired engine fueling, wherein the control system comprises a control strategy a) for causing the engine to run lean, and with the engine running lean, for processing data values of certain parameters to develop a data value for desired engine fueling for causing the engine to develop a corresponding desired output torque at a given engine speed; and b) for causing the engine to transition from running lean to running rich while striving to maintain engine output torque at the corresponding desired output torque at the given engine speed by processing i) the data value for desired engine fueling resulting from the processing of a), ii) a data value for engine speed, and iii) a data value for actual air-fuel ratio at which the engine is operating, to thereby develop a data value for desired engine fueling that causes the engine to run rich while striving to maintain engine output torque at the corresponding desired output torque at the given engine speed when the engine was running lean.