Active adaptive bias for closed loop air/fuel control system

摘要

An engine control system includes an adaptive bias sub-system (100) that generates bias values for controlling the air-fuel ratio. The sub-system (100) includes an integral controller (118) that reads an error signal from a post-catalyst switching EGO sensor (112). A plurality of noise isolation integrators (122) filter any noise resulting from a particular engine operating condition (e.g. acceleration, deceleration, idling) from the integrated error signal and stores the signal in a corresponding keep-alive memory (124) as a bias value for that engine operating condition. In a preferred embodiment, the post-catalyst feedback loop includes a gated proportional controller 116 that turns on for a limited period of time after the post-catalyst switching EGO sensor (112) switches states.By generating active adaptive bias values based on the engine's actual performance rather than relying on static, empirically-derived bias values, the active adaptive bias sub-system (100) can continuously optimize the stored bias values as the engine and engine controller ages or if the engine control system is placed in a different vehicle.