COORDINATION OF VEHICLE ACTUATORS DURING FIRING FRACTION TRANSITIONS

A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire and potentially variable displacement operation of an engine. In general, cam first transition strategies are described in which the cam phase is changed to, or close to a target...

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Bibliographic Details
Main Authors DIBBLE Donavan L, CARLSON Steven E, RAYL Allen B, SERRANO Louis J, HAASE Steven J
Format Patent
LanguageEnglish
Published 28.12.2017
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES
LIGHTING
MECHANICAL ENGINEERING
TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
WEAPONS
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Summary:A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire and potentially variable displacement operation of an engine. In general, cam first transition strategies are described in which the cam phase is changed to, or close to a target cam phase before a corresponding firing fraction change is implemented. When the cam phase change associated with a desired firing fraction change is relatively large, the firing fraction change is divided into a series of two or more firing fraction change steps-with each step using a cam first transition approach. A number of intermediate target selection schemes are described as well.
Bibliography:Application Number: US201615298542