Generate Mapped SI Engine from a Spreadsheet

If you have Model-Based Calibration Toolbox™and Stateflow^®, you can use the engine dynamometer reference application to generate lookup tables for the Mapped SI Engine block. The reference application uses engine data to calibrate the engine and generate the tables.

1. If it is not opened, open the reference application.

   autoblkSIDynamometerStart 

2. Click Generate Mapped Engine from Spreadsheet.

Step 1: Generate Mapped Engine Calibration

1. Use the Spreadsheet file field to provide a data file. By default, the reference application has SiEngineData.xlsx containing 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 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

2. Click Generate mapped engine calibration to generate response surface models in the Model-Based Calibration Toolbox and calibration in CAGE (CAlibration GEneration). CAGE and the model browser open when the process completes. To calibrate the data, Model-Based Calibration Toolbox uses templates.

   • The Model Browser provides the response model fits for the data contained in the data file, for example:

     

   • The CAGE Browser provides the calibrated data, for example:

     

Step 2: Apply Calibration to Mapped Engine Model

When you click Apply calibration to mapped engine model, Powertrain Blockset™:

• Updates the Mapped SI Engine block parameters with the calibrated table and breakpoint data.

• Sets the Mapped SI Engine as the active variant.

• Executes the engine mapping experiment.

When the dynamometer engine mapping completes, use the Simulation Data Inspector to verify the results.