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公开(公告)号：US11300026B2
公开(公告)日：2022-04-12
申请号：US17017229
申请日：2020-09-10
摘要： 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：US11131259B1
公开(公告)日：2021-09-28
申请号：US17119321
申请日：2020-12-11
发明人： Louis J. Serrano , Xiaoping Cai , Shikui Kevin Chen , Benjamin M. Wolk , Avra Brahma , Justin R. Lee
摘要： A system and method for transitioning a firing fraction of a variable displacement internal combustion engine when generating a desired torque output. During and following the transition to the second firing fraction, a charge of a combustion recipe is ascertained and used operating the cylinders of the variable displacement internal combustion engine to generate the desired torque output. The charge is preferably optimized for the engine operating at the second firing fraction, at least relative to the previous charge of the previous combustion recipe used with the first firing fraction.
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公开(公告)号：US11619187B2
公开(公告)日：2023-04-04
申请号：US17714880
申请日：2022-04-06
发明人： Louis J. Serrano , Xiaoping Cai , Shikui Kevin Chen , Benjamin M. Wolk , Avra Brahma , Justin R. Lee
摘要： A system and method for transitioning a firing fraction of a variable displacement internal combustion engine when generating a desired torque output. During and following the transition to the second firing fraction, a combustion recipe is ascertained and used operating the cylinders of the variable displacement internal combustion engine to generate the desired torque output. The recipe is preferably optimized for the engine operating at the second firing fraction, at least relative to the previous charge of the previous combustion recipe used with the first firing fraction.
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公开(公告)号：US11326532B1
公开(公告)日：2022-05-10
申请号：US17412668
申请日：2021-08-26
发明人： Louis J. Serrano , Xiaoping Cai , Shikui Kevin Chen , Benjamin M. Wolk , Avra Brahma , Justin R. Lee
摘要： A system and method for transitioning a firing fraction of a variable displacement internal combustion engine when generating a desired torque output. During and following the transition to the second firing fraction, a combustion recipe is ascertained and used operating the cylinders of the variable displacement internal combustion engine to generate the desired torque output. The recipe is preferably optimized for the engine operating at the second firing fraction, at least relative to the previous charge of the previous combustion recipe used with the first firing fraction.
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公开(公告)号：US11549455B2
公开(公告)日：2023-01-10
申请号：US16839651
申请日：2020-04-03
摘要： 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：US11459965B2
公开(公告)日：2022-10-04
申请号：US17186979
申请日：2021-02-26
发明人： Vijay Srinivasan , Louis J. Serrano , Xiaoping Cai , J. Steven Kolhouse , Avra Brahma , Adrian P. Dale
摘要： 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.
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公开(公告)号：US20220307434A1
公开(公告)日：2022-09-29
申请号：US17213387
申请日：2021-03-26
发明人： Louis J. Serrano , Kevin Shikui Chen , Xiaoping Cai , John Fuerst
摘要： A variety of methods and arrangements are described for operating an engine in a skip fire manner so that engine requirements, such as exhaust temperature, exhaust flow, torque and NVH, are met.
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公开(公告)号：US11359562B2
公开(公告)日：2022-06-14
申请号：US17463814
申请日：2021-09-01
发明人： Louis J. Serrano , Xin Yuan , John W. Parsels , Mohammad R. Pirjaberi , Mark A. Wilcutts , Masaki Nagashima
摘要： 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.
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公开(公告)号：US11352966B2
公开(公告)日：2022-06-07
申请号：US17082981
申请日：2020-10-28
发明人： Steven E. Carlson , Xin Yuan , Siamak Hashemi , Vijay Srinivasan , Srihari Kalluri , Andrew W. Phillips , Mark A. Wilcutts , Louis J. Serrano , Shikui Kevin Chen
摘要： Controllers and methods for managing transitions into and/or out of a cylinder cut off mode are described. In some embodiments, a skip fire based transition into a cylinder cut off mode is used in which the fraction of working cycles that are fired is gradually reduced to a threshold firing fraction. Once the threshold firing fraction has been reached, all of the working chambers are deactivated.
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公开(公告)号：US11280276B2
公开(公告)日：2022-03-22
申请号：US17192252
申请日：2021-03-04
摘要： 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.
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