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    CONSOLIDATION OF CONSTRAINTS IN MODEL PREDICTIVE CONTROL
    2.
    发明申请
    CONSOLIDATION OF CONSTRAINTS IN MODEL PREDICTIVE CONTROL 审中-公开

    公开(公告)号：US20190301387A1

    公开(公告)日：2019-10-03

    申请号：US15937128

    申请日：2018-03-27

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Ning Jin ,  Nicola Pisu ,  Ruixing Long ,  David N. Hayden

    IPC: F02D41/14

    Abstract: A method, control system, and propulsion system use model predictive control to control and track several parameters for improved performance of the propulsion system. Numerous sets of possible command values for a set of controlled variables are determined. Initial constraints for the controlled variables are determined, which include upper and lower limits for each controlled variable and upper and lower rate-of-change limits for each controlled variable. A set of consolidated constraint limits for the controlled variables is then determined. Each consolidated constraint limit is determined by consolidating one of the upper and lower limits with one of the upper and lower rate-of-change limits. A cost for each set of possible command values is determined, and the set of possible command values that has the lowest cost and falls within the set of consolidated constraint limits is selected for use in controlling the propulsion system.

    Method to perform intake cam lift state transitions
    3.
    发明授权
    Method to perform intake cam lift state transitions 有权

    公开(公告)号：US10352253B2

    公开(公告)日：2019-07-16

    申请号：US15674980

    申请日：2017-08-11

    Applicant: GM Global Technology Operations LLC

    Inventor： Christopher E. Whitney ,  David N. Hayden

    IPC: F01L1/34 ,  F02D13/02 ,  F16H59/14 ,  F16H61/14 ,  F02D41/00

    Abstract: A method of transitioning between two intake valve lift states while providing constant engine torque output comprehends the steps of receiving a lift change request from an engine control device, determining the current phase angles of the camshafts, and determining whether the intake and exhaust camshafts are at transition positions. The transition positions are experimentally or empirically determined combinations of operating conditions that result in constant engine torque output before and after the intake valve lift transition. If they are, an appropriate, i.e., low to high or high to low cam lift state transition of the intake valves occurs. If they are not, the cam phasers move the intake and exhaust camshafts to transition positions. When the cam phasers have moved the intake and exhaust camshafts to the transition positions, i.e., positions of constant engine torque output, the intake valve lift transitions from high to low or low to high.

    Method of controlling camshaft phase based on humidity
    4.
    发明授权
    Method of controlling camshaft phase based on humidity 有权

    公开(公告)号：US10167746B2

    公开(公告)日：2019-01-01

    申请号：US15429219

    申请日：2017-02-10

    Applicant: GM Global Technology Operations LLC

    Inventor： Christopher E. Whitney ,  David N. Hayden ,  Nicola Pisu ,  Stephen P. Levijoki

    IPC: F02D13/02 ,  F01L1/344 ,  F01L1/047 ,  F02D41/02 ,  F02D41/04 ,  F01L13/00 ,  F01L1/46

    Abstract: A method of phasing the opening and closing of internal combustion engine intake and exhaust valves relative to the rotation of the crankshaft is based upon changes in engine speed, engine load and ambient relative humidity. During certain conditions of higher humidity, in order to maintain good combustion stability and thus overall engine operation, it is necessary to reduce intake and exhaust valve overlap by adjusting the phase of the intake and exhaust camshafts. This is achieved by utilizing a set of cam position reference values and constraints based upon engine speed, engine load and humidity that are contained in lookup tables that adjust and limit cam position and valve overlap. Generally speaking, in order to maintain optimum engine performance, intake and exhaust valve overlap is reduced with higher ambient humidity and vice versa.

    Method to select optimal mode on a multi-mode engine with charging
    7.
    发明授权
    Method to select optimal mode on a multi-mode engine with charging 有权

    公开(公告)号：US10364765B2

    公开(公告)日：2019-07-30

    申请号：US15433511

    申请日：2017-02-15

    Applicant: GM Global Technology Operations LLC

    Inventor： David N. Hayden ,  Michael Deffenbaugh ,  Christopher E. Whitney

    IPC: F02D41/00 ,  F02D41/14

    Abstract: A control method for selecting an optimal multiple step operating mode for a multiple cylinder motor vehicle engine system having variable lift includes prioritizing each of a full torque capacity (FTC) mode having all cylinders operating at high lift, a first reduced capacity economy mode (RCE1) having all cylinders operating at low lift, and a second reduced capacity economy mode (RCE2) having fewer than all of the cylinders operating at low lift with at least one cylinder deactivated based on predicted fuel economy of each of the modes. Multiple constraints are applied to each of the prioritized modes including incorporating boost as one of the constraints by calculating a maximum torque capacity for each mode that is a function of a current boost pressure. A mode determination arbitration is conducted to identify if a change in mode is required.

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