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Calibrate Mapped CI Engine Using Data

If you have Model-Based Calibration Toolbox™, the Virtual Vehicle Composer can use a data set to calibrate a mapped compression-ignition (CI) engine in the vehicle.

  1. Open the Virtual Vehicle Composer app.

  2. On the Setup tab:

    1. Specify your virtual vehicle options, including Vehicle class, Model template, and Vehicle dynamics.

    2. Set Powertrain architecture to a configuration that uses a CI engine, for example, Conventional Vehicle.

    3. Click Configure.

  3. On the Data and Calibration tab, select Powertrain > Engine.

  4. In the Engine list, select CI Mapped Engine.

  5. Select the Calibrate from Data tab.

  6. Use the Firing Data and Nonfiring Data boxes to provide data files. By default, the app uses the file CiEngineData.xlsx, which contains required and optional data. The tables summarize the data file requirements for generating calibrated tables that are functions of either injected fuel mass or engine torque and engine speed.

    Firing data contains data collected at different engine torques and speeds.

    Firing DataDescriptionData Requirements for Generating Mapped Engine Tables
    Function of Fuel Mass and Engine SpeedFunction of Torque and Engine Speed
    FuelMassCmd

    Injected fuel mass, in mg per injection

    Required

    Not used

    Torque

    Engine torque command, in N·m

    RequiredRequired
    EngSpd

    Engine speed, in rpm

    RequiredRequired
    AirMassFlwRate

    Air mass flow, in kg/s

    Optional

    Optional

    FuelMassFlwRate

    Fuel mass flow, in kg/s

    Optional

    Optional

    ExhTemp

    Exhaust temperature, in K

    Optional

    Optional

    BSFC

    Engine brake-specific fuel consumption (BSFC), in g/kWh

    Optional

    Optional

    HCMassFlwRate

    Hydrocarbon emission mass flow, in kg/s

    Optional

    Optional

    COMassFlwRate

    Carbon monoxide emission mass flow, in kg/s

    Optional

    Optional

    NOxMassFlwRate

    Nitric oxide and nitrogen dioxide emissions mass flow, in kg/s

    Optional

    Optional

    CO2MassFlwRate

    Carbon dioxide emission mass flow, in kg/s

    Optional

    Optional

    PMMassFlwRate

    Particulate matter emission mass flow, in kg/s

    Optional

    Optional

    Nonfiring data contains data collected at different engine speeds without fuel consumption.

    Nonfiring DataDescriptionData Requirements for Generating Mapped Engine Tables
    Function of Fuel Mass and Engine SpeedFunction of Torque and Engine Speed
    FuelMassCmd

    Injected fuel mass, in mg per injection

    Not used

    Not used

    Torque

    Engine torque command, in N·m

    Required

    Required

    EngSpd

    Engine speed, in rpm

    Required

    Required

    AirMassFlwRate

    Air mass flow, in kg/s

    Optional

    Optional

  7. Click Calibrate to generate response surface models in the Model-Based Calibration Toolbox and calibration in CAGE (CAlibration GEneration). To calibrate the data, Model-Based Calibration Toolbox uses templates.

    If prompted, select the firing or non-firing data sheets. Click OK.

    When the process completes, the app updates the powertrain subsystem Mapped CI Engine block parameters with the calibrated data.

  8. Review the engine characteristics response surface models, for example, air mass flow.

    Response surface for air mass flow.

  9. Optionally, to use additional calibration options, click Open Calibration Tool. The Model-Based Calibration Toolbox opens.

    • The Model Browser provides the response model fits for the data contained in the data file.

    • The CAGE Browser provides the calibrated data.

    For information, see Model-Based Calibration Toolbox.

See Also

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