公开(公告)号：US20210348573A1

公开(公告)日：2021-11-11

申请号：US17186979

申请日：2021-02-26

申请人： Tula Technology, Inc. ,  Cummins Inc.

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

IPC分类号： F02D41/00 ,  F02M26/05

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.

公开(公告)号：US20220412277A1

公开(公告)日：2022-12-29

申请号：US17899038

申请日：2022-08-30

申请人： Tula Technology, Inc. ,  Cummins Inc.

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

IPC分类号： F02D41/00 ,  F02M26/05

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.

公开(公告)号：US20220009348A1

公开(公告)日：2022-01-13

申请号：US16926174

申请日：2020-07-10

申请人： Tula Technology, Inc. ,  Cummins Inc.

发明人： J. Steven KOLHOUSE ,  Lisa A. ORTH-FARRELL ,  Steven E. CARLSON ,  Aaron W. BEINBORN

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

摘要： 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.