Engine control system for a lean burn engine having fuel vapor recovery

摘要

Fuel vapors are purged from a fuel system into an engine air/fuel intake and the mass flow of such vapors are adaptively learned during a fuel vapor learning mode. When operating in a lean air/fuel operating mode, the lean mode is periodically disabled and the fuel vapor learning mode periodically enabled to update the measurement of inducted fuel vapors. Fuel delivery to the engine is corrected by such measurement to compensate for inducted fuel vapors and maintain engine operation at the desired air/fuel ratio.