公开(公告)号：US20230392561A1

公开(公告)日：2023-12-07

申请号：US17830925

申请日：2022-06-02

Applicant: Tula Technology, Inc.

Inventor： Louis J. SERRANO ,  Xin YUAN ,  Shikui Kevin CHEN ,  Xi LUO ,  Robert C. WANG ,  Xiaoping CAI ,  Vijay SRINIVASAN

IPC: F02D41/00 ,  F02D41/24

CPC classification number: F02D41/0087 ,  F02D41/2403 ,  F02D41/0085 ,  F02D2200/1002 ,  F02D2200/50 ,  F02D2200/0802

Abstract: A system and method for operating an ICE by (a) generating a running history of one or more-cylinder events per cylinder, and (b) using the running history to select a least-used non-rotating firing pattern, among a plurality of non-rotating firing patterns, provided for each firing fraction less than one (1). By making the least used selection based on the running history, unequal usage among cylinders of the ICE can be mitigated.

公开(公告)号：US20170234253A1

公开(公告)日：2017-08-17

申请号：US15584686

申请日：2017-05-02

Applicant: Tula Technology, Inc.

Inventor： Louis J. SERRANO ,  Robert C. WANG

IPC: F02D41/12 ,  F02D17/02 ,  F02D41/00

CPC classification number: F02D41/12 ,  F01N11/007 ,  F02D17/02 ,  F02D17/04 ,  F02D29/02 ,  F02D41/003 ,  F02D41/0087 ,  F02D41/126 ,  F02D2009/024 ,  F02D2041/0012 ,  F02D2200/0406 ,  F02D2250/08 ,  F02D2250/41 ,  F02M25/089 ,  F02M35/10222 ,  F02M35/10229

Abstract: Methods and arrangements for transitioning an engine between a deceleration cylinder cutoff (DCCO) state and an operational state are described. In one aspect, transitions from DCCO begin with reactivating cylinders to pump air to reduce the pressure in the intake manifold prior to firing any cylinders. In another aspect, transitions from DCCO, involve the use of an air pumping skip fire operational mode. After the manifold pressure has been reduced, the engine may transition to either a cylinder deactivation skip fire operational mode or other appropriate operational mode. In yet another aspect a method of transitioning into DCCO using a skip fire approach is described. In this aspect, the fraction of the working cycles that are fired is gradually reduced to a threshold firing fraction. All of the working chambers are then deactivated after reaching the threshold firing fraction.

公开(公告)号：US20230220810A1

公开(公告)日：2023-07-13

申请号：US18180362

申请日：2023-03-08

Applicant: Tula Technology, Inc.

Inventor： Robert C. WANG ,  Louis J. SERRANO ,  Shikui Kevin CHEN

IPC: F02D41/22 ,  F02D41/00 ,  F02D13/02 ,  F02D13/06

CPC classification number: F02D41/221 ,  F02D41/0087 ,  F02D41/009 ,  F02D13/0242 ,  F02D13/06 ,  F02D2200/0406

Abstract: A method of operating an engine is provided. An exhaust valve actuation fault is detected for a first exhaust valve associated with a first cylinder during a first working cycle. In response to the detection of the exhaust valve actuation fault, fueling to at least the first cylinder is cut off. Actuation of the first exhaust valve is attempted in second working cycles that follow the first working cycle, wherein the second working cycles are not fueled. Whether or not the first exhaust valve actuated properly during the second working cycles is determined. Operation of the first cylinder is resumed when it is determined that the first exhaust valve actuated properly. Operation of the first cylinder is not resumed when it is determined that the first exhaust valve did not actuate properly.

公开(公告)号：US20220220919A1

公开(公告)日：2022-07-14

申请号：US17569722

申请日：2022-01-06

Applicant: Tula Technology, Inc.

Inventor： Robert C. WANG ,  Louis J. SERRANO ,  Shikui Kevin CHEN

IPC: F02D41/22 ,  F02D41/00 ,  F02D13/06 ,  F02D13/02

Abstract: A method of operating an engine is provided. An exhaust valve actuation fault is detected for a first exhaust valve associated with a first cylinder during a first working cycle. In response to the detection of the exhaust valve actuation fault, fueling to at least the first cylinder is cut off. Actuation of the first exhaust valve is attempted in second working cycles that follow the first working cycle, wherein the second working cycles are not fueled. Whether or not the first exhaust valve actuated properly during the second working cycles is determined. Operation of the first cylinder is resumed when it is determined that the first exhaust valve actuated properly. Operation of the first cylinder is not resumed when it is determined that the first exhaust valve did not actuate properly.