Mapped CI Lookup Tables as Functions of Engine Torque and Speed

The Model-Based Calibration Toolbox™ includes projects and templates that you can use to generate calibrated compression-ignition (CI) lookup tables as a function of engine torque and speed. Use the tables in the Powertrain Blockset™ Mapped CI Engine (Powertrain Blockset) block.

Use Test Plan Template to Fit Models

1. In the Model Browser, to open the data, select Import Data. Navigate to the spreadsheet that contains the data.

   For example, open matlab\toolbox\mbc\mbctraining\CiEngineData.xlsx.

   The spreadsheet contains firing and motor data collected at different engine torques and speeds.

   Firing Data	Description
   FuelMassCmd	Commanded fuel mass, in mg
   Torque	Engine torque, in Nm
   EngSpd	Engine speed, in rpm
   AirMassFlwRate	Air mass flow, in kg/s
   BSFC	Engine brake-specific fuel consumption (BSFC), in g/kWh
   CO2MassFlwRate	Carbon dioxide emission mass flow, in kg/s
   COMassFlwRate	Carbon monoxide emission mass flow, in kg/s
   ExhTemp	Exhaust temperature, in K
   FuelMassFlwRate	Fuel mass flow, in kg/s
   HCMassFlwRate	Hydrocarbon emission mass flow, in kg/s
   NOxMassFlwRate	Nitric oxide and nitrogen dioxide emissions mass flow, in kg/s
   PMMassFlwRate	Particulate matter emission mass flow, in kg/s

   Nonfiring motor data is collected at different engine speeds, without fuel consumption.

   Nonfiring Data	Description
   Torque	Engine torque command, in Nm
   EngSpd	Engine speed, in rpm
   AirMassFlwRate	Air mass flow, in kg/s

2. In the Select Sheet dialog box, select the data that you want to calibrate. For example, select Firing Data.

3. Optionally, use the Data Editor filter the data. After you have filtered the data, close the Data Editor.

4. In the Model Browser, select Fit Models. In the Fit Models dialog box, in the Template pane, select the template.

   For example, to fit the firing data in the spreadsheet, select MappedEngine-Torque. Do not change the default responses and inputs.

   

5. Review the model fits.

   To review the response models, in the tree, select the top level.

   

   To review the response surfaces, in the tree, select the response.

   

Open CAGE Project

To open the project, in the CAGE Case Studies pane:

1. Select CI Mapped Engine - Torque Input.

2. Click Open Example.

The project includes these tables.

Name	Description	Table
f_air	Air mass flow, in kg/s
f_eff	Engine brake-specific fuel consumption (BSFC), in g/kWh
f_co2	Carbon dioxide emission mass flow, in kg/s
f_co	Carbon monoxide emission mass flow, in kg/s
f_texh	Exhaust temperature, in K
f_fuel	Fuel mass flow, in kg/s
f_hc	Hydrocarbon emission mass flow, in kg/s
f_nox	Nitric oxide and nitrogen dioxide emissions mass flow, in kg/s
f_pm	Particulate matter emission mass flow, in kg/s
f_brake	Engine torque command, in Nm

Use CAGE to Import and Replace Models

Use the project to import and replace existing models with new models.

1. In CAGE, select File > Import > Model. If you do not have a model open, the model browser opens. Select a model.

2. If your current project has two or more test plans, the Import Models dialog box prompts you to merge compatible models. Select No.

3. The Import Models dialog box prompts you to Replace, Skip, or Create new models. Select Replace.

   

After you import and replace the existing models, the Import Models wizard opens the Update Tables dialog box. You can use the Update Table dialog box to rerun optimizations and feature fills to update the tables with the new models.

Review and Export Lookup Tables

1. In CAGE, review the calibrated tables.

2. To export the tables, select File > Export > Calibration > All Items. Use the Export to parameter to specify the format. To export so that you can use the data for the Powertrain Blockset mapped engine blocks, select Simulink Model Workspace. The Model-Based Calibration Toolbox saves the mapped engine table and breakpoint data to the model workspace.