公开(公告)号：US20210348573A1

公开(公告)日：2021-11-11

申请号：US17186979

申请日：2021-02-26

Applicant: Tula Technology, Inc. ,  Cummins Inc.

Inventor： Vijay SRINIVASAN ,  Louis J. SERRANO ,  Xiaoping CAI ,  J. Steven KOLHOUSE ,  Avra BRAHMA ,  Adrian P. DALE

IPC: F02D41/00 ,  F02M26/05

Abstract: 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 (NOx) and/or hydrocarbon emissions are reduced or altogether eliminated during the transition.

公开(公告)号：US20210199060A1

公开(公告)日：2021-07-01

申请号：US17192252

申请日：2021-03-04

Applicant: Tula Technology, Inc.

Inventor： Mohammad R. PIRJABERI ,  Adya S. TRIPATHI ,  Louis J. SERRANO

IPC: F02D17/02 ,  F02D13/06 ,  F02D41/00

Abstract: Engine controllers and methods are described that facilitate skip fire control of an internal combustion engine. An engine controller determines a skip fire firing fraction and (as appropriate) associated engine settings that are suitable for delivering a requested output. The engine controller selects an operational firing fraction from a set of available firing fractions. A firing controller then directs cylinder firings in a skip fire manner that delivers the selected operational firing fraction. The firing controller includes an accumulator that helps smooth transitions between different firing fractions.

公开(公告)号：US20210071605A1

公开(公告)日：2021-03-11

申请号：US17064354

申请日：2020-10-06

Applicant: Tula Technology, Inc.

Inventor： Louis J. SERRANO ,  Xin YUAN ,  John W. PARSELS ,  Mohammad R. PIRJABERI ,  Mark A. WILCUTTS ,  Masaki NAGASHIMA

IPC: F02D41/00 ,  F02D41/14 ,  F02D41/30 ,  B60W30/20

Abstract: 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.

公开(公告)号：US20200232404A1

公开(公告)日：2020-07-23

申请号：US16783495

申请日：2020-02-06

Applicant: Tula Technology, Inc.

Inventor： Matthew A. YOUNKINS ,  Louis J. SERRANO

IPC: F02D41/00 ,  F02D41/04 ,  F02D13/06 ,  F02D13/02 ,  F02D17/02 ,  F02D41/10 ,  F02D41/12 ,  F02P5/145 ,  F01L1/047 ,  F02D41/26 ,  F02P5/15 ,  F02D11/02

Abstract: In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.

公开(公告)号：US20200025050A1

公开(公告)日：2020-01-23

申请号：US16576972

申请日：2019-09-20

Applicant: Tula Technology, Inc.

Inventor： Shikui Kevin CHEN ,  Matthew A. YOUNKINS ,  Louis J. SERRANO

IPC: F01N3/20 ,  F01N3/08 ,  F02D41/00 ,  F01N11/00 ,  F01N3/021 ,  F02D41/40 ,  F01N13/00

Abstract: 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.

公开(公告)号：US20190184959A1

公开(公告)日：2019-06-20

申请号：US15874656

申请日：2018-01-18

Applicant: Tula Technology, Inc.

Inventor： Yongyan CAO ,  Ying REN ,  Louis J. SERRANO ,  Robert Scott BAILEY ,  Ram SUBRAMANIAN

IPC: B60W10/06 ,  F02D41/14 ,  G06K9/00 ,  F02D41/00 ,  F02D35/02 ,  B60W30/188 ,  B60W30/20 ,  G05D1/00

CPC classification number: B60W10/06 ,  B60W30/1882 ,  B60W30/20 ,  B60W2710/0666 ,  F02D35/02 ,  F02D41/0087 ,  F02D41/1497 ,  F02D41/1498 ,  F02D2200/101 ,  F02D2200/701 ,  F02D2200/702 ,  G05D1/0088 ,  G06K9/00362

Abstract: The present invention relates generally to improving the fuel efficiency of autonomous vehicles by operating either (1) at a first effective engine displacement that takes into account noise, vibration and harshness (NVH) when the vehicle is occupied or (2) at a second effective engine displacement, without concern for occupant NVH, when the vehicle is not occupied. The second effective engine displacement is typically more fuel efficient than the first effective engine displacement, but result in a higher level of NVH compared to the first effective engine displacement.

公开(公告)号：US20180320615A1

公开(公告)日：2018-11-08

申请号：US16038622

申请日：2018-07-18

Applicant: Tula Technology, Inc.

Inventor： Mohammad R. PIRJABERI ,  Kian EISAZADEH-FAR ,  Steven E. CARLSON ,  Louis J. SERRANO

IPC: F02D41/00 ,  F02D41/30 ,  F02D41/14

CPC classification number: F02D41/0087 ,  F02D41/0002 ,  F02D41/1498 ,  F02D41/3058 ,  F02D41/307 ,  F02D2041/0012 ,  Y02T10/42

Abstract: Methods, devices, estimators, controllers and algorithms are described for estimating the torque profile of an engine and/or for controlling torque applied to a powertrain by one or more devices other than the engine itself to manage the net torque applied by the engine and other device(s) in manners that reduce undesirable NVH. The described approaches are particularly well suitable for use in hybrid vehicles in which the engine is operated in a skip fire or other dynamic firing level modulation manner—however they may be used in a variety of other circumstances as well. In some embodiments, the hybrid vehicle includes a motor/generator that applies the smoothing torque.

公开(公告)号：US20180320614A1

公开(公告)日：2018-11-08

申请号：US16035614

申请日：2018-07-14

Applicant: Tula Technology, Inc.

Inventor： Matthew A. YOUNKINS ,  Louis J. SERRANO

IPC: F02D41/00 ,  F02D13/02 ,  F02D41/04 ,  F02D13/06 ,  F02D11/02 ,  F02P5/15 ,  F02D41/26 ,  F01L1/047 ,  F02P5/145 ,  F02D41/12 ,  F02D41/10 ,  F02D17/02

CPC classification number: F02D41/0087 ,  F01L1/047 ,  F02D11/02 ,  F02D13/0223 ,  F02D13/0273 ,  F02D13/06 ,  F02D17/02 ,  F02D41/0002 ,  F02D41/008 ,  F02D41/04 ,  F02D41/107 ,  F02D41/123 ,  F02D41/26 ,  F02D2041/001 ,  F02D2041/0012 ,  F02D2250/18 ,  F02P5/145 ,  F02P5/1502 ,  Y02T10/142 ,  Y02T10/42

Abstract: In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.

公开(公告)号：US20180163650A1

公开(公告)日：2018-06-14

申请号：US15894548

申请日：2018-02-12

Applicant: Tula Technology, Inc.

Inventor： Louis J. SERRANO ,  Vijay SRINIVASAN ,  Geoffrey ROUTLEDGE ,  Mark A. SHOST ,  Biswa R. GHOSH ,  Mark A. WILCUTTS ,  Matthew A. YOUNKINS

IPC: F02D41/00 ,  F02D13/02 ,  F02D41/04 ,  F02D13/06 ,  F02P5/15 ,  F02D41/26 ,  F01L1/047 ,  F02P5/145 ,  F02D41/12 ,  F02D41/10 ,  F02D17/02

CPC classification number: F02D41/0087 ,  F01L1/047 ,  F02D13/0223 ,  F02D13/0273 ,  F02D13/06 ,  F02D17/02 ,  F02D41/0002 ,  F02D41/008 ,  F02D41/04 ,  F02D41/107 ,  F02D41/123 ,  F02D41/26 ,  F02D2041/001 ,  F02D2041/0012 ,  F02D2250/18 ,  F02N11/0837 ,  F02P5/145 ,  F02P5/15 ,  F02P5/1502 ,  F02P9/002 ,  F16F15/02 ,  G10K11/16 ,  G10K11/1785 ,  G10K11/17883 ,  G10K2210/1282 ,  G10K2210/3211 ,  G10K2210/3212 ,  Y02T10/142 ,  Y02T10/42

Abstract: Systems and methods for reducing noise or vibration generated by an internal combustion engine are described. An engine controller is arranged to operate the working chambers of the engine in a cylinder output level modulation manner. A noise/vibration reduction unit actively control of a device that is not a part of the powertrain. The device is controlled in a feed forward manner to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a characteristic of the cylinder output level modulation operation of the engine.

公开(公告)号：US20180046184A1

公开(公告)日：2018-02-15

申请号：US15672132

申请日：2017-08-08

Applicant: Tula Technology, Inc.

Inventor： Ram SUBRAMANIAN ,  Louis J. SERRANO ,  Matthew A. YOUNKINS

IPC: G05D1/00 ,  F02D41/14 ,  F02D41/00 ,  F02D17/02 ,  F02P5/15

CPC classification number: G05D1/0061 ,  B60W30/1882 ,  F02D11/105 ,  F02D17/02 ,  F02D29/02 ,  F02D41/0087 ,  F02D41/1402 ,  F02D2200/501 ,  F02D2250/18 ,  F02P5/1512

Abstract: The present invention relates generally to techniques for improving fuel efficiency of a vehicle powered by an internal combustion engine capable of operating at various displacement levels. An autonomous driving unit or cruise controller selects when possible an engine torque output that corresponds to a fuel efficient displacement level. The resultant vehicle speed profile and NVH level is acceptable to vehicle occupants.