Calibrate Mapped SI Engine Using Data

If you have Model-Based Calibration Toolbox™, the Virtual Vehicle Composer can use a data set to calibrate a mapped spark-ignition (SI) 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 SI engine, for example, Hybrid Electric Vehicle P2.

   3. Click Configure.

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

4. Set Engine to SI 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 SiEngineData.xlsx, which contains required and optional data. The tables summarize the data file requirements for generating calibrated tables that are functions of engine torque and engine speed.

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

   Firing Data	Description	Data Requirements for Generating Mapped Engine Tables
   FuelMassCmd	Injected fuel mass, in mg per injection	Not used
   Torque	Engine torque command, in N·m	Required
   EngSpd	Engine speed, in rpm	Required
   AirMassFlwRate	Air mass flow, in kg/s	Optional
   FuelMassFlwRate	Fuel mass flow, in kg/s	Optional
   ExhTemp	Exhaust temperature, in K	Optional
   BSFC	Engine brake-specific fuel consumption (BSFC), in g/kWh	Optional
   HCMassFlwRate	Hydrocarbon emission mass flow, in kg/s	Optional
   COMassFlwRate	Carbon monoxide emission mass flow, in kg/s	Optional
   NOxMassFlwRate	Nitric oxide and nitrogen dioxide emissions mass flow, in kg/s	Optional
   CO2MassFlwRate	Carbon dioxide emission mass flow, in kg/s	Optional
   PMMassFlwRate	Particulate matter emission mass flow, in kg/s	Optional

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

   Nonfiring Data	Description	Data Requirements for Generating Mapped Engine Tables
   FuelMassCmd	Injected fuel mass, in mg per injection	Not used
   Torque	Engine torque command, in N·m	Required
   EngSpd	Engine speed, in rpm	Required
   AirMassFlwRate	Air mass flow, in kg/s	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 SI Engine block parameters with the calibrated data.

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