PROJECT TITLE :
Controlled Load and Speed Transitions in a Multicylinder Recompression HCCI Engine
A model-based management strategy to trace combustion phasing throughout load and speed transitions within the homogeneous charge compression ignition (HCCI) operating region of a multimode combustion engine is presented in this paper. HCCI transitions will traverse regions of high cyclic variability (CV), even if the steady state transition end points are stable with low CV. A control-oriented HCCI model for each the stable, low CV region and therefore the oscillatory, high CV, late phasing region is used to style a controller that uses valve and fuel injection timings to trace combustion phasing. Novel aspects of the controller include nonlinear model-inversion-based feedforward and gain scheduled feedback based on unburned fuel that reduces transient CV. Transitions tested on a multicylinder HCCI engine embody load transitions at fixed engine speeds, simultaneous load, and speed transitions, and select FTP75 drive-cycle transitions with high load slew rates. Sensible combustion phasing tracking performance is demonstrated, and misfires are prevented.
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