Integrated fueling control

摘要

Integrated control of internal combustion engine fueling including control of fuel injectors and control of purge valve position to vary the rate at which fuel vapor trapped in a canister is purged to an engine intake manifold, determines the mass of purge vapor reaching the intake manifold, estimates the mass of purge vapor reaching each engine cylinder, and adjusts the engine cylinder fuel injection mass in response thereto to provide an accurate overall cylinder fueling insensitive to the purge rate, allowing the purge control operations to be aggressively driven while ambitious cylinder air/fuel ratio standards are maintained. Feedforward purge control proactively adjusts purge control commands in response to desired cylinder purge mass and to purge vapor flow dynamics and feedback purge control trims the purge control commands in response to a difference between the desired cylinder purge mass and estimated cylinder purge mass.