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    Managing engine firing fraction changes during gear shifts
    52.
    发明授权
    Managing engine firing fraction changes during gear shifts 有权

    公开(公告)号：US10814858B2

    公开(公告)日：2020-10-27

    申请号：US16800976

    申请日：2020-02-25

    Applicant: Tula Technology, Inc.

    Inventor： Xiaoping Cai ,  Louis J. Serrano ,  Andrew W. Phillips

    IPC: B60W10/06 ,  B60W10/11 ,  F02D17/02 ,  F02D13/06 ,  F02D41/00

    Abstract: Methods and controllers for coordinating firing fraction transitions that occur in conjunction with transmission shifts are described. In some embodiments, when a transmission shift to a target gear is expected, a target firing fraction is determined that is desired for use after the shift has completed. In selected circumstances, the change to the target firing fraction is initiated prior to the shift to the target gear. The transition to the target firing fraction preferably completes before an inertia/speed phase of the shift. In other embodiments, the engine transitions to all cylinder operation or other suitable transitional firing fraction in response to an expected transmission shift. After the shift completes, a transition is made to a target firing fraction. The described approaches are well suited for use during skip fire or other cylinder output level modulation operation of the engine and are particularly beneficial during up-shifts.

    Engine torque smoothing
    53.
    发明授权
    Engine torque smoothing 有权

    公开(公告)号：US10787979B2

    公开(公告)日：2020-09-29

    申请号：US16278075

    申请日：2019-02-16

    Applicant: Tula Technology, Inc.

    Inventor： Mohammad R. Pirjaberi ,  Kian Eisazadeh-Far ,  Steven E. Carlson ,  Louis J. Serrano

    IPC: F02D41/00 ,  F02D41/14 ,  F02D41/30

    Abstract: Methods, devices, estimators, controllers and algorithms are described for estimating the torque profile of an engine and/or for controlling torque applied to a powertrain by one or more devices other than the engine itself to manage the net torque applied by the engine and other device(s) in manners that reduce undesirable NVH. The described approaches are particularly well suitable for use in hybrid vehicles in which the engine is operated in a skip fire or other dynamic firing level modulation manner—however they may be used in a variety of other circumstances as well. In some embodiments, the hybrid vehicle includes a motor/generator that applies the smoothing torque.

    Deceleration cylinder cut-off in a hybrid vehicle
    55.
    发明授权
    Deceleration cylinder cut-off in a hybrid vehicle 有权

    公开(公告)号：US10167799B2

    公开(公告)日：2019-01-01

    申请号：US15584686

    申请日：2017-05-02

    Applicant: Tula Technology, Inc.

    Inventor： Louis J. Serrano ,  Robert C. Wang

    IPC: F02M25/08 ,  F02D41/12 ,  F02D41/00 ,  F02D17/02 ,  F02M35/10 ,  F01N11/00 ,  F02D29/02 ,  F02D9/02

    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.

    Skip fire transition control
    56.
    发明授权
    Skip fire transition control 有权

    公开(公告)号：US10107211B2

    公开(公告)日：2018-10-23

    申请号：US15646476

    申请日：2017-07-11

    Applicant: Tula Technology, Inc.

    Inventor： Mohammad R. Pirjaberi ,  Louis J. Serrano ,  Xin Yuan ,  Steven E. Carlson ,  Siamak Hashemi ,  Ryan A. Kuhlenbeck

    IPC: F02D41/00 ,  F02D37/02 ,  F02P5/15 ,  F02D17/02 ,  F02D41/28

    Abstract: Methods and arrangements are described for controlling transitions between firing fractions during skip fire operation of an engine in order to help smooth the transitions. Generally, firing fractions transitions are implemented gradually, preferably in a manner that relatively closely tracks manifold filling dynamics. In some embodiments, the commanded firing fraction is altered each firing opportunity. Another approach contemplates altering the commanded firing fraction by substantially the same amount each firing opportunity for at least a portion of the transition. These approaches work particularly well when the commanded firing fraction is provided to a skip fire controller that includes an accumulator functionality that tracks the portion of a firing that has been requested, but not delivered, or vice versa. In various embodiments, commanded firing fraction changes are delayed relative to initiation of the change in throttle position to help compensate for inherent delays associated with changing the manifold air pressure.

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