Tula Technology, Inc.

Cummins Inc.

Justin R Lee

Benjamin M Wolk

Louis Joseph Serrano

Shikui Kevin Chen

Avra Brahma

Xiaoping Cai

Timothy Hayden Shipp

A variety of methods and arrangements are described for determining a pilot injection mass during skip fire operation of an internal combustion engine.

Method for determining pilot injection mass

A system and method for transitioning a firing fraction of a variable displacement internal combustion engine when generating a desired torque output. During and following the transition to the second firing fraction, a combustion recipe is ascertained and used operating the cylinders of the variable displacement internal combustion engine to generate the desired torque output. The recipe is preferably optimized for the engine operating at the second firing fraction, at least relative to the previous charge of the previous combustion recipe used with the first firing fraction.

Optimizing combustion recipes to improve engine performance and emissions for variable displacement engines

A system and method for transitioning a firing fraction of a variable displacement internal combustion engine when generating a desired torque output. During and following the transition to the second firing fraction, a charge of a combustion recipe is ascertained and used operating the cylinders of the variable displacement internal combustion engine to generate the desired torque output. The charge is preferably optimized for the engine operating at the second firing fraction, at least relative to the previous charge of the previous combustion recipe used with the first firing fraction.

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Brownsburg, IN, United States of America

Justin R Lee