Harness, Dickey & Pierce, P.L.C.
HCCI combustion moding state control for fuel economy and seamless transitions
A method and system for controlling an engine includes a spark ignition (SI) control module operating the engine in a spark ignition mode in a high lift valve state and a pre-HCCI control module entering a matching state when homogeneous charge compression ignition (HCCI) mode conditions are met. When a matching condition is met, the pre-HCCI control module enters a pre-homogeneous charge compression ignition mode and performs spark retardation, stratified operation or lean operation and commands a low lift valve state. The system also includes an HCCI control module entering an HCCI mode and when in the low lift valve state.
GM Global Technology Operations, Inc.
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Peter Allen B. Vijay Jun-Mo Chen-Fang
Kafarnik Rayl Ramappan Kang Chang