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公开(公告)号：US11333053B2
公开(公告)日：2022-05-17
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：US20220128011A1
公开(公告)日：2022-04-28
申请号：US17569308
申请日：2022-01-05
Applicant: Tula Technology, Inc. , Cummins Inc.
Inventor： Elliott A. ORTIZ-SOTO , Shahaboddin OWLIA
Abstract: Engine controllers and control schemes are provided for managing engine state transitions requiring increased compressor pressure ratios in turbocharged engines. In some circumstances, turbo lag can be mitigated by initially transitioning the engine to an intermediate engine state that directly or indirectly increases airflow through the engine and turbocharger relative to what would be possible if the engine were immediately commanded to operate at the target engine state. After reaching a point where the desired torque is actually generated at the intermediate engine state, the operational settings are gradually reduced to the target effective firing density while increasing the operational compressor pressure ratio to the target compressor ratio.
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公开(公告)号：US11306672B2
公开(公告)日：2022-04-19
申请号：US17224648
申请日：2021-04-07
Applicant: Tula Technology, Inc. , Cummins Inc.
Inventor： Matthew A. Younkins , Xi Luo
IPC: F02B27/04 , F02D41/06 , F02D17/02 , F02P5/14 , F02D41/30 , F01L1/34 , F02D41/00 , F01N3/10 , F01N3/035 , F01N3/20 , F01M1/16 , F01L9/16 , F01M1/02 , F01M5/00
Abstract: A system and method for a variable displacement internal combustion engine using different types of pneumatic cylinder springs on skipped working cycles to control engine and aftertreatment system temperatures are described. The system and method may be used to rapidly heat up the aftertreatment system(s) and/or an engine block of the engine following a cold start by using one or more different types of pneumatic cylinder springs during skipped firing opportunities. By rapidly heating the aftertreatment system(s) and/or engine block, noxious emissions such as hydrocarbons, carbon monoxide, NOx and/or particulates, following cold starts are significantly reduced.
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公开(公告)号：US20220090548A1
公开(公告)日：2022-03-24
申请号：US17406547
申请日：2021-08-19
Applicant: Tula Technology, Inc. , Cummins, Inc.
Inventor： Benjamin Wolk , Justin Lee , Timothy Hayden Shipp
Abstract: A variety of methods and arrangements are described for determining a pilot injection mass during skip fire operation of an internal combustion engine.
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公开(公告)号：US20220065151A1
公开(公告)日：2022-03-03
申请号：US17002509
申请日：2020-08-25
Applicant: Tula Technology, Inc.
Inventor： Shahaboddin Owlia
Abstract: Methods, systems, and devices for particulate filter soot management for internal combustion engines are described herein. A method for particulate filter soot management for internal combustion engines includes determining a quantity of soot on a particulate filter and adjusting a skip fire firing sequence based at least in part on maintaining the quantity of soot on the particulate filter within a desired soot quantity range.
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Patent Agency Ranking
公开(公告)号：US11260844B2
公开(公告)日：2022-03-01
申请号：US17029560
申请日：2020-09-23
Applicant: Tula Technology, Inc.
Inventor： Andrew W. Phillips , Louis J. Serrano , Xiaoping Cai
Abstract: Methods and controllers for coordinating firing fraction transitions that occur in conjunction with transmission shifts are described. In one aspect, an engine controller transmits a do-not-shift instruction to a transmission controller based at least in part on a determination that a particular type of firing fraction transition is desired. The firing fraction transition is then implemented using a skip fire transition protocol. In this manner, the transmission is affirmatively prevented from shifting during the firing fraction transition. The described approaches are well suited for use in connection with transitions to DCCO or DFCO operation.
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207.发明申请公开(公告)号：US20220010744A1
公开(公告)日：2022-01-13
申请号：US17407984
申请日：2021-08-20
Applicant: Tula Technology, Inc.
Inventor： Shikui Kevin CHEN , Aditya MANDAL , Li-Chun CHIEN , Elliott ORTIZ-SOTO
Abstract: Using machine learning for cylinder misfire detection in a dynamic firing level modulation controlled internal combustion engine is described. In a classification embodiment, cylinder misfires are differentiated from intentional skips based on a measured exhaust manifold pressure. In a regressive model embodiment, the measured exhaust manifold pressure is compared to a predicted exhaust manifold pressure generated by neural network in response to one or more inputs indicative of the operation of the vehicle. Based on the comparison, a prediction is made if a misfire has occurred or not. In yet other alternative embodiment, angular crank acceleration is used as well for misfire detection.
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公开(公告)号：US20220009348A1
公开(公告)日：2022-01-13
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
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.
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公开(公告)号：US20210404412A1
公开(公告)日：2021-12-30
申请号：US17218657
申请日：2021-03-31
Applicant: Tula Technology, Inc. , Cummins Inc.
Inventor： Andrew W. PHILLIPS , Jerry F. FUSCHETTO
Abstract: A skip fire engine controller is disclosed that commands an early direct-injection of fuel during a skipped working cycle in which a cylinder is not exhausted. With early direct injection, the fuel has more time to vaporize and mix with air for combustion in an immediately following working cycle in which the cylinder is fired. By increasing the degree of vaporization and mixing, the combustion is both cleaner and more efficient.
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公开(公告)号：US20210404397A1
公开(公告)日：2021-12-30
申请号：US17332763
申请日：2021-05-27
Applicant: Tula Technology, Inc.
Inventor： Yongyan CAO , Elliott A. ORTIZ-SOTO , Louis J. SERRANO
Abstract: A variety of engine controllers and methods are described for controlling engines operating in a cylinder output level modulation mode. In one aspect transitions between different effective firing fractions are managed by gradually ramping an effective firing density. In another, when an engine transitions to a multi-level skip fire firing density that has more than one possible high/low/skip sequence, the phase of the high/low pattern is set relative to the phase of the firing pattern to ensure that a preferred high/low/skip sequence is generated. In another aspect, rapid large torque changes can be implemented in part by immediately changing the operational high/low fraction in response to a command to increase or reduce the desired engine torque.
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