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公开(公告)号：US20210301703A1
公开(公告)日：2021-09-30
申请号：US17347083
申请日：2021-06-14
Applicant: Tula Technology, Inc.
Inventor： Matthew A. Younkins , Shikui Kevin Chen , Mark A. Wilcutts
Abstract: A variety of methods and arrangements for controlling the exhaust gas temperature of a lean burn, skip fire controlled internal combustion engine are described. In one aspect, an engine controller includes an aftertreatment system monitor and a firing timing determination unit. The aftertreatment monitor obtains data relating to a temperature of one or more aftertreatment elements, such as a catalytic converter. Based at least partly on this data, the firing timing determination unit generates a firing sequence for operating the engine in a skip fire manner such that the temperature of the aftertreatment element is controlled within its effective operating range.
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公开(公告)号：US11060430B2
公开(公告)日：2021-07-13
申请号：US16654373
申请日：2019-10-16
Applicant: Tula Technology, Inc.
Inventor： Matthew A. Younkins , Shikui Kevin Chen , Mark A. Wilcutts
Abstract: A variety of methods and arrangements for controlling the exhaust gas temperature of a lean burn, skip fire controlled internal combustion engine are described. In one aspect, an engine controller includes an aftertreatment system monitor and a firing timing determination unit. The aftertreatment monitor obtains data relating to a temperature of one or more aftertreatment elements, such as a catalytic converter. Based at least partly on this data, the firing timing determination unit generates a firing sequence for operating the engine in a skip fire manner such that the temperature of the aftertreatment element is controlled within its effective operating range.
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公开(公告)号：US11053828B2
公开(公告)日：2021-07-06
申请号：US16576972
申请日：2019-09-20
Applicant: Tula Technology, Inc.
Inventor： Shikui Kevin Chen , Matthew A. Younkins , Louis J. Serrano
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.
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公开(公告)号：US10982617B2
公开(公告)日：2021-04-20
申请号：US16552052
申请日：2019-08-27
Applicant: Tula Technology, Inc.
Inventor： Xi Luo , Jerry F. Fuschetto , Xin Yuan , Matthew A. Younkins
Abstract: 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.
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公开(公告)号：US10954877B2
公开(公告)日：2021-03-23
申请号：US16749607
申请日：2020-01-22
Applicant: Tula Technology, Inc.
Inventor： Masaki Nagashima , Mohammad R. Pirjaberi , Louis J. Serrano , Xin Yuan , John W. Parsels , Mark A. Wilcutts
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 dynamic firing level modulation manner. A smoothing torque is determined by adaptive control 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 firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.
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Patent Agency Ranking
公开(公告)号：US10941722B2
公开(公告)日：2021-03-09
申请号：US16270349
申请日：2019-02-07
Applicant: Tula Technology Inc. , GM Global Technology Operations LLC
Inventor： Mark A. Shost , Louis J. Serrano , Steven E. Carlson , Vijay Srinivasan , Eric J. Defenderfer , Nitish J. Wagh , Randall S. Beikmann , Jinbiao Li , Xin Yuan , Li-Chun Chien
Abstract: In one aspect, a skip fire engine controller is described. The skip fire engine controller includes a skip fire module arranged to determine an operational firing fraction and associated cylinder load for delivering a desired engine output. The skip fire engine controller also includes a firing controller arranged to direct firings in a skip fire manner that delivers the selected operational firing fraction. Various methods, modules, lookup tables and arrangements related to the selection of a suitable operational firing fraction are also described.
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公开(公告)号：US10814858B2
公开(公告)日：2020-10-27
申请号：US16800976
申请日：2020-02-25
Applicant: Tula Technology, Inc.
Inventor： Xiaoping Cai , Louis J. Serrano , Andrew W. Phillips
Abstract: Methods and controllers for coordinating firing fraction transitions that occur in conjunction with transmission shifts are described. In some embodiments, when a transmission shift to a target gear is expected, a target firing fraction is determined that is desired for use after the shift has completed. In selected circumstances, the change to the target firing fraction is initiated prior to the shift to the target gear. The transition to the target firing fraction preferably completes before an inertia/speed phase of the shift. In other embodiments, the engine transitions to all cylinder operation or other suitable transitional firing fraction in response to an expected transmission shift. After the shift completes, a transition is made to a target firing fraction. The described approaches are well suited for use during skip fire or other cylinder output level modulation operation of the engine and are particularly beneficial during up-shifts.
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公开(公告)号：US20200318566A1
公开(公告)日：2020-10-08
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
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.
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公开(公告)号：US10787979B2
公开(公告)日：2020-09-29
申请号：US16278075
申请日：2019-02-16
Applicant: Tula Technology, Inc.
Inventor： Mohammad R. Pirjaberi , Kian Eisazadeh-Far , Steven E. Carlson , Louis J. Serrano
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.
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公开(公告)号：US20200218258A1
公开(公告)日：2020-07-09
申请号：US16822741
申请日：2020-03-18
Applicant: Tula Technology, Inc.
Inventor： Ram SUBRAMANIAN , Louis J. SERRANO , Matthew A. YOUNKINS
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.
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