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2 Example: Generating the Plugin Solver Code for the Full Powertrain Model
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2.1 Generating the Plugin Solver Code for the Full Powertrain Model
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Preparing a Model
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In this example, you will perform the steps required to generate the plugin solver code using the Full Powertrain model.
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1.
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Open the Full Powertrain example.
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2.
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Generate the MapleSim Connector for VI-CarRealTime template.
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3.
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Define template settings.
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4.
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Generate the plugin solver code.
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To open the Full Powertrain example
1. In MapleSim, expand the VI-CarRealTime Examples palette.
2. Click the Full Powertrain example to open it.
To generate the MapleSim Connector for VI-CarRealTime template
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1.
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If you have not already done so, open the Full Powertrain example found in the VI-CarRealTime Examples palette.
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2.
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Click Templates (
) in the main toolbar. The Create Attachment for FullPowertrain window appears.
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3.
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From the list, select the VI-CarRealTime Plugin Solver Generation template.
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4.
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In the Attachment field, enter Powertrain as the worksheet name.
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5.
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Click Create Attachment. Your MapleSim model opens in Maple, using the selected template.
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To define the template settings
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Select the FullPowertrain1 subsystem from the Main drop-down list in the toolbar above the model diagram.
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Click Load Selected Subsystem. All of the template fields are populated with information specific to the subsystem displayed in the model diagram.
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3.
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In the Inputs/Outputs and Parameter Management section, specify which subsystem parameters to keep as configurable parameters in the generated block. The following assignments should be made:
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Inputs: The table below shows the appropriate input variable assignments.
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| Table 2.1: Input variable assignments for the Full Powertrain model. |
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Input Variables
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Port Grouping Name
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`Main.FullPowertrain1.Wheel_L2_Omega`(t)
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"OUTPUT_FV_Wheel_L2_Omega"
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`Main.FullPowertrain1.Wheel_R2_Omega`(t)
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"OUTPUT_FV_Wheel_R2_Omega"
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`Main.FullPowertrain1.driver_demands_throttle`(t)
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"OUTPUT_FV_driver_demands_throttle"
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Outputs: The table below shows the appropriate output variable assignments.
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| Table 2.2: Output variable assignments for the Full Powertrain model. |
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Output Variables
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Port Grouping Name
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`Main.FullPowertrain1.INPUT_FV_mdrv_L1`(t)
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"INPUT_FV_mdrv_L1"
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`Main.FullPowertrain1.INPUT_FV_mdrv_L2`(t)
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"INPUT_FV_mdrv_L2"
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`Main.FullPowertrain1.INPUT_FV_mdrv_R1`(t)
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"INPUT_FV_mdrv_R1"
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`Main.FullPowertrain1.INPUT_FV_mdrv_R2`(t)
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"INPUT_FV_mdrv_R2"
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`Main.FullPowertrain1.engine_max_trq`(t)
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"INPUT_FV_engine_max_trq"
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`Main.FullPowertrain1.engine_min_trq`(t)
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"INPUT_FV_engine_min_trq"
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`Main.FullPowertrain1.engine_omega`(t)
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"INPUT_FV_engine_omega"
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`Main.FullPowertrain1.engine_trq`(t)
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"INPUT_FV_engine_trq"
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`Main.FullPowertrain1.transmission_ratio`(t)
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"INPUT_FV_transmission_ratio"
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Select Add an additional output port for subsystem state variables to add extra output ports for the state variables.
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4.
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In the C Code Generation Options section, set the following options:
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C Code Generation Options
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Setting
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Solver Options
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Euler
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Optimization Options
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Level of code optimization (0=None, 3=Full)
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3
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Constraint Handling Options
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Maximum number of projection iterations
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Apply projection during event iterations
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3
0.1e-4
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Event Handling Options
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Maximum number of event iterations
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Width of event hysteresis band
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10
0.1e-9
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Baumgarte Constraint Stabilization
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Apply Baumgarte constraint stabilization
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Baserate
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The rate at which the model runs
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Number of internal steps
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0.1e-2
1
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5.
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In the Generate Plugin Solver Code section of the template, specify the Target directory, the VI-CarRealTime installation directory, the Visual C++ directory, and the Model Name.
The following figure gives an example of some of these settings. Note that the locations of your VI-CarRealTime installation directory and your Visual C++ directory depend on the operating system you are running (XP, Vista, or Windows 7), its version (32- or 64-bit), and the version of VI-CarRealTime.
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To generate the plugin solver code
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Click Generate Plugin Solver Code to generate the C code source files. The C source files are created along with a batch file to and saved in the target directory.
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Click Generate and Compile Plugin Solver Code to generate the C code source files and then compile them.
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The generated files are stored in a subdirectory of the Target directory. The name of the subdirectory is the same as the Model Name. For example, if you entered C:\MS_CRT_models for the Target directory and FullPowertrain1 for the Model Name, then your C code files are saved in a directory called C:\MS_CRT_models\FullPowertrain1.
You can view the generated plugin solver code files (the VI-CarRealTime Interface C Code and cMsimModel.c) in the View C Code section of the template.
Note: Generating a block may require a few minutes.
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