Tula Technology, Inc.

Cummins Inc.

Other

Shikui Kevin Chen

Matthew Aaron Younkins

Louis Joseph Serrano

Xin Yuan

Mark A Wilcutts

Li-Chun Chien

Vijay Srinivasan

Xiaoping Cai

Elliott A Ortiz-Soto

Steven E Carlson

Aditya Mandal

Mark A Shost

Mohammad R Pirjaberi

Avra Brahma

Siamak Hashemi

John W Parsels

Masaki Nagashima

Joel D Van Ess

Benjamin M Wolk

Justin R Lee

Robert C Wang

Andrew W Phillips

Allan Joseph Kotwicki

Joshua P Switkes

Jennifer Kay Light-Holets

Scott Robert Bardakjy

Robert Scott Bailey

Srihari Kalluri

Willa Angel Chen

Xi Luo

Charles H Loucks

Quanjun Ling Chen

Geoff Routledge

A method of operating an engine is provided. An exhaust valve actuation fault is detected for a first exhaust valve associated with a first cylinder during a first working cycle. In response to the detection of the exhaust valve actuation fault, fueling to at least the first cylinder is cut off. Actuation of the first exhaust valve is attempted in second working cycles that follow the first working cycle, wherein the second working cycles are not fueled. Whether or not the first exhaust valve actuated properly during the second working cycles is determined. Operation of the first cylinder is resumed when it is determined that the first exhaust valve actuated properly. Operation of the first cylinder is not resumed when it is determined that the first exhaust valve did not actuate properly.

Exhaust valve failure diagnostics and management

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 skip fire engine controller and method of control is described wherein during transitions from a first firing density to a second firing density, a firing density and a pumping density are separately set so as to balance the conflicting demands of (a) torque control, (b) Noise, Vibration and Harshness (NVH), (c) air flow through the engine and (d) air-fuel ratio.

Separately determining firing density and pumping density during firing density transitions for a lean-burn internal combustion engine

System and methods are described for optimizing exhaust flow rate and temperature during specified operational periods warm-up and keep-warm conditions, by minimizing or maximizing heat flux during those specified operational periods.

Lean burn internal combustion engine exhaust gas control

A diagnostic system and method that (a) that uses models indicative of both successful firing and skips to determine if cylinders of a skip fire controlled internal combustion engine have successfully fired or successfully skipped and (b) uses filtered exhaust gas pressure readings for detecting faults associated with EGR systems and/or turbocharger systems.

Diagnostic system and method for detecting internal combustion engine faults using exhaust pressure readings

A system and method of integrating an engine having dynamic skip fire control with an exhaust gas recirculation system in a turbocharged internal combustion engine is described. An engine control system determines an appropriate firing pattern based at least in part on a desired exhaust gas recirculation flow rate. Signals from sensors in the intake manifold and exhaust system may also be used as part of a feedback loop to determine a desired exhaust gas recirculation flow rate.

Exhaust gas recirculation control in an internal combustion engine

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 controlling an internal combustion engine involving (1) cylinder trapping strategies where one of several pneumatic spring types are dynamically selected for cylinders based at least partially on a predicted number of upcoming skips for each of the cylinders respectively and/or (2) staggering various valvetrain dependent operational engine strategies as operating conditions permit as the internal combustion engine warms up following a cold start.

Cylinder charge trapping strategies based on predictive number of skips and staggered implementation of valvetrain dependent operational strategies for internal combustion engines

Exhaust gas recirculation control in a dynamic skip fire engine

A system and method for the use of machine learning for detecting faults for cylinder intake and/or exhaust valves that do not properly open or close as commanded and for generating a flag for such faults.

Use of machine learning for detecting cylinder intake and/or exhaust valve faults during operation of an internal combustion engine

Controllers and methods for managing transitions into and/or out of a cylinder cut off mode are described. In some embodiments, a skip fire based transition into a cylinder cut off mode is used in which the fraction of working cycles that are fired is gradually reduced to a threshold firing fraction. Once the threshold firing fraction has been reached, all of the working chambers are deactivated.

Deceleration cylinder cut-off

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San Jose, CA, United States of America

Shikui Kevin Chen