Control strategy for expanding diesel HCCI combustion range by lowering intake manifold temperature

摘要

An engine ( 10 ) utilizes "regular EGR cooling" when operating in HCCI mode at loads within a low load range ( 56, 58, 60 ) and "enhanced EGR cooling" that allows the engine to continue to operate in HCCI mode when engine load increases beyond loads in the low load range ( 64, 66, 68 ). When engine load increases further to a point where it enters a high load range, the combustion mode changes over to conventional diesel combustion, and exhaust gas recirculation reverts to "regular EGR cooling" ( 70, 72, 74 ).