Tula Technology, Inc.

Cummins Inc.

Tula Etechnology, Inc.

Gm Global Technolgoy Operations, Inc.

Vijay Srinivasan

Louis Joseph Serrano

Matthew Aaron Younkins

Shikui Kevin Chen

Xin Yuan

Steven E Carlson

Mark A Wilcutts

Mark A Shost

Siamak Hashemi

Xiaoping Cai

Geoffrey Routledge

Andrew W Phillips

J Steven Kolhouse

Avra Brahma

Randall S Beikmann

Li-Chun Chien

Elliott A Ortiz-Soto

Eric J Defenderfer

Nitish J Wagh

Ying Ren

Jinbiao Li

Biswa R Ghosh

Srihari Kalluri

Adrian P Dale

David Schmidt

David J Langenderfer

Xi Luo

Robert Scott Bailey

Robert C Wang

Zakirul Islam

Yongyan Cao

Louis Joe Serrano

Andrea Marie Evans

Kevin Shikui Chen

A variety of methods, controllers, and electric machine systems are described that facilitate pulsed control of multiple electric machines (e.g., electric motors and generators) to improve the machine's energy conversion efficiency. Under selected operating conditions, the electric machine is intermittently driven (pulsed). The pulsed operation causes the output of the electric machine to alternate between a first output level and a second output level that is lower than the first output level. The output levels are selected such that at least one of the electric machines and a system that includes the electric machine has a higher energy conversion efficiency during the pulsed operation than the electric machine would have when operated at a third output level that would be required to drive the electric machine in a continuous manner to deliver the desired output. In some embodiments, the second output level is zero torque.

Pulsed control of multiple electric machines

Pulsed control of electric motors, and more particularly, to selectively adjusting one or more of a pulsing frequency, an amplitude of the pulses and/or a duty cycle of the pulses for reducing Noise, Vibration and Harshness (NVH) while maintaining high levels of operating efficiency.

Pulsed electric machine control

A variety of methods and arrangements are described for managing recharging of cylinders of an internal combustion engine during skip fire operation of the engine. In one method, a maximum allowed deactivation time for a cylinder is determined and the cylinder is recharged before the maximum allowed deactivation time is exceeded.

Recharging management for skipping cylinders

A system includes an exhaust aftertreatment system including a particulate filter and a controller. The controller is configured to: receive a particulate filter regeneration event trigger; receive information, the information comprising a temperature regarding the particulate filter; determine the temperature regarding the particulate filter is below a temperature threshold associated with a particulate filter regeneration event; and responsive to determining the temperature regarding the particulate filter is below the temperature threshold, command the engine to operate in a cylinder deactivation mode, whereby at least one cylinder of a plurality of cylinders of the engine is deactivated.

Systems and methods for particulate filter regeneration with cylinder deactivation

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 variety of methods and arrangements are described for managing transitions between operational states of an internal combustion engine during skip fire operation of the engine.

Dynamic skip fire transitions for fixed CDA engines

Methods, systems, and devices for operating an engine controller in a vehicle for managing motor torque smoothing. One controller is configured to select a periodic disruptive waveform generated over a period of time to approximate that is associated with the vehicle being at idle, determine a first harmonic sinusoid from a group of harmonic sinusoids that reduces the error between an approximated waveform and the disruptive waveform, and initiate a supplemental quantity of torque during the period of time based on the disruption quantity of torque.

Motor torque smoothing on combustion engines by approximating a periodic waveform using sinusoids

Methods, systems, and devices for managing motor torque smoothing for internal combustion engine cylinder recharging events are described herein. An engine controller in a vehicle for managing motor torque smoothing for internal combustion engine cylinder recharging events may be configured to operate the internal combustion engine at a firing fraction that is less than a value of 1.0, wherein one or more cylinders are not designated to be fired, determine a recharge event time period where a particular one of the cylinders that have not been designated to be fired is recharged, identify a disruption quantity of torque during the recharging event time period, and actuate an additional motor to initiate a supplemental quantity of torque during the recharge event time period based on the disruption quantity of torque.

Motor torque smoothing for recharging events on combustion engines

An internal combustion engine operates so that it delivers zero or negative torque. The engine operates in either a deceleration cylinder cut off (DCCO) mode or skip cylinder compression braking mode. In the skip cylinder compression braking mode, selected working cycles of selected working chambers are operated in a compression release braking mode. Accordingly, individual working chambers are sometimes not fired and sometimes operated in the compression release braking mode while the engine is operating in the skip cylinder compression braking mode.

Skip cylinder compression braking

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

Managing firing fraction transitions of a variable displacement internal combustion engines by (a) avoiding transport delays in an Exhaust Gas Recirculation (EGR) feed by starting movement of an EGR valve position after a decision to transition to a new firing fraction has been made, but prior to the start of the transition and (b) adjusting the EGR valve as needed during the transition so as to maintain an EGR fraction within a predetermined range during the transition. By performing both (a) and (b), spikes of nitrous oxide (NO) and/or hydrocarbon emissions are reduced or altogether eliminated during the transition.

Exhaust gas recirculation flow control for reducing emissions with variable displacement internal combustion engines

Methods, systems, and devices for operating an internal combustion engine at a firing fraction that is less than a value of 1.0, wherein one or more cylinders of the internal combustion engine are not designated to be fired, determining a smoothing event time period where a particular one of the cylinders that have not been designated to be fired is either skipped or recharged, selecting a periodic disruptive waveform to approximate that is related to a skip or recharge event that is part of the smoothing event time period, determining a first harmonic sinusoid from a group of harmonic sinusoids that reduces the error between an approximated waveform and the disruptive waveform, determining a timeframe for utilizing the first harmonic, and actuating an additional motor to initiate a supplemental quantity of torque during the smoothing event time period based on the disruption quantity of torque.

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Farmington Hills, MI, United States of America

Vijay Srinivasan