Tula Technology, Inc.

Xi Luo

Matthew Aaron Younkins

Xin Yuan

Louis Joseph Serrano

Shikui Kevin Chen

Vijay Srinivasan

Mark A Wilcutts

Xiaoping Cai

Jerry F Fuschetto

Robert C Wang

Anastasios Arvanitis

A system and method for operating an ICE by (a) generating a running history of one or more-cylinder events per cylinder, and (b) using the running history to select a least-used non-rotating firing pattern, among a plurality of non-rotating firing patterns, provided for each firing fraction less than one (1). By making the least used selection based on the running history, unequal usage among cylinders of the ICE can be mitigated.

Non-rotating cylinder pattern selection for equalizing cylinder usage in an internal combustion engine

A system and method for a variable displacement internal combustion engine using different types of pneumatic cylinder springs on skipped working cycles to control engine and aftertreatment system temperatures are described. The system and method may be used to rapidly heat up the aftertreatment system(s) and/or an engine block of the engine following a cold start by using one or more different types of pneumatic cylinder springs during skipped firing opportunities. By rapidly heating the aftertreatment system(s) and/or engine block, noxious emissions such as hydrocarbons, carbon monoxide, NOand/or particulates, following cold starts are significantly reduced.

Use of different pneumatic cylinder spring types in a variable displacement engine for engine and aftertreatment system temperature control

A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.

Noise, vibration and harshness reduction in a skip fire engine control system

A vehicle, engine controller and method for coordinating direct split injection of two or more pulses of fuel during a working cycle of a reactivated cylinder which was deactivated in a previous working cycle is described. By using split injection for the reactivated cylinder, the particulate matter and particulate number ('PM/PN') generated by the reactivated cylinder is reduced.

Split direct injection for reactivated cylinders of an internal combustion engine

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Xi Luo