Idle speed control of a direct injection spark ignition stratified charge engine

SUMMARY Idle speed control is investigated for a direct injection, spark ignition, strati"ed charge (DISC) engine equipped with an electronic throttle. Such engines can be operated in multiple combustion modes. When operating in strati"ed charge combustion mode, they are very di!erent from conventional stoichiometric engines, creating new opportunities for improved speed control. With current after-treatment technology, simultaneous high fuel economy and emissions conversion e$ciency cannot be achieved by operating the engine in a steady-state manner: it must be cycled between running ultra-lean (for fuel economy) and rich (to service the after-treatment system). An idle speed control system is designed to meet the considerable feedback control demands required by these new engines. Copyright 2001 John Wiley & Sons, Ltd.

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