公开(公告)号：US11724594B2

公开(公告)日：2023-08-15

申请号：US16926174

申请日：2020-07-10

Applicant: Tula Technology, Inc. ,  Cummins Inc.

Inventor： J. Steven Kolhouse ,  Lisa A. Orth-Farrell ,  Steven E. Carlson ,  Aaron W. Beinborn

IPC: F02D41/02 ,  B60K17/28 ,  F02D17/02 ,  B60K17/02 ,  F01N11/00 ,  B60N2/00

CPC classification number: B60K17/28 ,  B60K17/02 ,  B60N2/002 ,  F01N11/002 ,  F02D17/02 ,  F02D41/0215 ,  F02D41/0235 ,  F02D2200/0802 ,  F02D2200/60

Abstract: Engine controllers and control schemes that facilitate skip fire engine operation in conjunction with use power take-off devices are described. In one aspect, a skip fire mode is exited when the power take-off unit is engaged and the current torque request exceeds a torque threshold. In some embodiments, the exit is delayed when the temperature of an after treatment system is below a designated temperature threshold. In another aspect, the engine transitions to the skip fire mode when the power take-off unit disengages. In some embodiments, exiting is conditioned on the current torque request being less than a torque threshold. In some embodiments, the transition is made immediately, whereas in others the transition only occurs when the power take-off unit is not reengaged for a period of time or is further conditioned on determining that the power take-off unit is likely to remain disengaged for the period of time.

公开(公告)号：US20230227041A1

公开(公告)日：2023-07-20

申请号：US17576160

申请日：2022-01-14

Applicant: Tula Technology, Inc.

Inventor： Louis J. SERRANO ,  Xiaoping CAI ,  Andrew W. PHILLIPS

IPC: B60W30/19 ,  F02D41/02 ,  F02D41/00 ,  B60W10/11 ,  B60W10/06

CPC classification number: B60W30/19 ,  F02D41/0225 ,  F02D41/0087 ,  B60W10/11 ,  B60W10/06 ,  F02D2200/501 ,  F02D2200/101

Abstract: Methods and controllers for controlling engine speed to reduce NVH that occurs in conjunction with transmission shifts are described. In some embodiments, when a transmission shift to a target gear is expected, a target engine speed appropriate for the target gear is first determined. A target rate of change of the engine speed is calculated from the initial engine speed and target engine speed in conjunction with a target transition time. A target torque is then calculated from the target rate of change of engine speed. A target firing fraction or induction ratio are determined that are desired for use with the target engine speed based on the target torque. The transition to the target engine speed and target firing fraction or induction ratio are completed before the gear shift is completed. The described approaches are well suited for use during skip fire or other cylinder output level modulation operation of the engine.

公开(公告)号：US20230220810A1

公开(公告)日：2023-07-13

申请号：US18180362

申请日：2023-03-08

Applicant: Tula Technology, Inc.

Inventor： Robert C. WANG ,  Louis J. SERRANO ,  Shikui Kevin CHEN

IPC: F02D41/22 ,  F02D41/00 ,  F02D13/02 ,  F02D13/06

CPC classification number: F02D41/221 ,  F02D41/0087 ,  F02D41/009 ,  F02D13/0242 ,  F02D13/06 ,  F02D2200/0406

Abstract: 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.

公开(公告)号：US11624341B2

公开(公告)日：2023-04-11

申请号：US17883338

申请日：2022-08-08

Applicant: Tula Technology, Inc. ,  Cummins Inc.

Inventor： Xin Yuan ,  Shikui Kevin Chen ,  Jennifer K. Light-Holets ,  Scott R. Bardakjy

IPC: F02M26/43 ,  F02D41/00 ,  F02M26/05 ,  F02D41/14

Abstract: 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.

公开(公告)号：US11560818B2

公开(公告)日：2023-01-24

申请号：US17459776

申请日：2021-08-27

Applicant: Tula Technology, Inc.

Inventor： Matthew A. Younkins ,  Shikui Kevin Chen

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

Abstract: 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.

公开(公告)号：US20230016806A1

公开(公告)日：2023-01-19

申请号：US17952070

申请日：2022-09-23

Applicant: CUMMINS INC. ,  TULA TECHNOLOGY, INC.

Inventor： J. Steven Kolhouse ,  Ross A. Phillips

IPC: F02D17/02 ,  F02D41/00

Abstract: A method of controlling a skip-fire cylinder deactivation system of an engine system is provided. The method includes a controller deactivating a cylinder of the engine system to operate the engine system in a skip-fire mode. The method further includes determining a temperature of an injector tip nozzle associated with the cylinder and comparing the temperature of the injector tip nozzle to a threshold a temperature. In response to determining that the temperature of the injector tip nozzle is greater than the threshold temperature, the cylinder is activated by the controller.

公开(公告)号：US11549455B2

公开(公告)日：2023-01-10

申请号：US16839651

申请日：2020-04-03

Applicant: Tula Technology, Inc. ,  Cummins Inc.

Inventor： Steven E. Carlson ,  Louis J. Serrano ,  Mark A. Wilcutts ,  Vijay Srinivasan

IPC: F02D41/00 ,  F02D17/02 ,  F02D41/24

Abstract: 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.

公开(公告)号：US11530659B2

公开(公告)日：2022-12-20

申请号：US17622349

申请日：2020-07-02

Applicant: CUMMINS INC. ,  TULA TECHNOLOGY, INC.

Inventor： J. Steven Kolhouse ,  Aaron William Beinborn ,  Lyle E. Kocher

IPC: F02D41/00 ,  F02D17/02 ,  F02D41/08 ,  F02D13/06 ,  F02D41/26

Abstract: A system for controlling operations of an engine comprises a plurality of cylinders and a controller operatively coupled to each of the plurality of cylinders. The controller is configured to determine an operating condition of the engine, and in response to determining that the operating condition is suitable for activating less then all cylinders of the plurality of cylinders during a cycle of the engine, determine a first firing pattern, and a second firing pattern different from the first firing pattern for activating the plurality of cylinders of the engine. The controller is configured to activate a first set of cylinders of the plurality of cylinders based on the first firing pattern, and subsequent to activating the first set of cylinders, activate a second set of cylinders of the plurality of cylinders different from the first set of cylinders based on the second firing pattern.

公开(公告)号：US20220364486A1

公开(公告)日：2022-11-17

申请号：US17870452

申请日：2022-07-21

Applicant: Cummins Inc. ,  Tula Technology, Inc.

Inventor： Timothy R. Frazier ,  J. Steven Kolhouse ,  Steven J. Small ,  Louis Joseph Serrano

IPC: F01L13/00 ,  F01L9/10 ,  F02D13/06 ,  F02D13/02

Abstract: Systems and methods to extend a life of a component of a cylinder deactivation system are provided. A method includes generating, by a controller, an initial life factor for the component; initiating, by the controller, a CDA mode for an engine; determining, by the controller, an actual life factor for the component, the actual life factor determined by comparing a number of switching events of a cylinder in the CDA mode to a number of cycles of the cylinder in the CDA mode; comparing, by the controller, the actual life factor to the initial life factor; and modifying, by the controller based on the comparison, operation of the engine in the CDA mode to adjust the actual life factor.

公开(公告)号：US11459965B2

公开(公告)日：2022-10-04

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 ,  F02M26/23 ,  F02M37/02 ,  F02M26/43 ,  F02D37/02

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.