公开(公告)号：US20180179970A1

公开(公告)日：2018-06-28

申请号：US15902685

申请日：2018-02-22

Applicant: Tula Technology, Inc. ,  GM Global Technology Operations LLC

Inventor： Louis J. SERRANO ,  Steven E. CARLSON ,  Steven J. HAASE ,  Donavan L. DIBBLE ,  Allen B. RAYL

IPC: F02D41/00 ,  F02D41/02 ,  F02D37/02 ,  F02D17/02 ,  B60W30/188 ,  B60W10/06 ,  B60W10/02 ,  F02P5/15

CPC classification number: F02D41/0087 ,  B60W10/023 ,  B60W10/06 ,  B60W30/1886 ,  B60W2710/025 ,  F02D17/026 ,  F02D37/02 ,  F02D41/0215 ,  F02D2041/001 ,  F02D2250/21 ,  F02P5/1504

Abstract: A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire or other dynamic firing level modulation operation of an engine. In general, actuator first transition strategies are described in which an actuator position (e.g., cam phase, TCC slip, etc.) is changed to, or close to a target position before a corresponding firing fraction change is implemented. When the actuator change associated with a desired firing fraction change is relatively large, the firing fraction change is divided into a series of two or more firing fraction change steps. A number of intermediate target selection schemes are described as well.

公开(公告)号：US20170370309A1

公开(公告)日：2017-12-28

申请号：US15298542

申请日：2016-10-20

Applicant: Tula Technology, Inc. ,  GM Global Technology Operations LLC

Inventor： Louis J. SERRANO ,  Steven E. CARLSON ,  Steven J. HAASE ,  Donavan L. DIBBLE ,  Allen B. RAYL

IPC: F02D41/00 ,  F02D17/02 ,  F02D37/02 ,  F02P5/145

CPC classification number: F02D41/0087 ,  B60W10/023 ,  B60W10/06 ,  B60W30/188 ,  B60W2710/025 ,  F02D17/02 ,  F02D37/02 ,  F02D41/0215 ,  F02D2041/001 ,  F02D2250/21 ,  F02P5/145 ,  F02P5/1504

Abstract: A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire and potentially variable displacement operation of an engine. In general, cam first transition strategies are described in which the cam phase is changed to, or close to a target cam phase before a corresponding firing fraction change is implemented. When the cam phase change associated with a desired firing fraction change is relatively large, the firing fraction change is divided into a series of two or more firing fraction change steps—with each step using a cam first transition approach. A number of intermediate target selection schemes are described as well.