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

IPC: F02D41/00 ,  F02D41/24 ,  F02D17/02

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.

公开(公告)号：US20190184959A1

公开(公告)日：2019-06-20

申请号：US15874656

申请日：2018-01-18

Applicant: Tula Technology, Inc.

Inventor： Yongyan CAO ,  Ying REN ,  Louis J. SERRANO ,  Robert Scott BAILEY ,  Ram SUBRAMANIAN

IPC: B60W10/06 ,  F02D41/14 ,  G06K9/00 ,  F02D41/00 ,  F02D35/02 ,  B60W30/188 ,  B60W30/20 ,  G05D1/00

CPC classification number: B60W10/06 ,  B60W30/1882 ,  B60W30/20 ,  B60W2710/0666 ,  F02D35/02 ,  F02D41/0087 ,  F02D41/1497 ,  F02D41/1498 ,  F02D2200/101 ,  F02D2200/701 ,  F02D2200/702 ,  G05D1/0088 ,  G06K9/00362

Abstract: The present invention relates generally to improving the fuel efficiency of autonomous vehicles by operating either (1) at a first effective engine displacement that takes into account noise, vibration and harshness (NVH) when the vehicle is occupied or (2) at a second effective engine displacement, without concern for occupant NVH, when the vehicle is not occupied. The second effective engine displacement is typically more fuel efficient than the first effective engine displacement, but result in a higher level of NVH compared to the first effective engine displacement.