Virtual Vehicle Solver Configuration Settings

The virtual vehicle template uses a data dictionary, VehicleConfig.sldd, to store the solver configuration settings for data objects. To view the solver configuration settings, in the Model Explorer, navigate to Simulink Root > ConfiguredVirtualVehicleModel > External Data > VirtualVehicleTemplate > Configurations.

By default, the Virtual Vehicle Composer app uses the VehicleConfig.sldd data dictionary to configure the virtual vehicle model elements with these data objects. The data objects contain these solver parameter settings.

Virtual Vehicle Model Element	Default VehicleConfig.sldd Data Object	Solver Parameter Settings
		Type	Solver	Fixed-step size
All Simulink® plant models	VehicleVariable	Variable-step	ode23tb	N/A
All Simscape™ plant models	VehicleVariableDae	Variable-step	daessc	N/A
All powertrain system controllers, including electric vehicles (EVs) and hybrid-electric vehicles (HEVs)	VehicleFixed10ms	Fixed-step	ode4	.01
All brake system controllers	VehicleFixed1ms	Fixed-step	ode4	.001
Thermal system	VehicleFixed100ms	Fixed-step	ode4	0.1
Engine dynamometer plant models	EngDynoVariable	Variable-step	ode23tb	N/A
Engine dynamometer controllers	EngFixed10ms	Fixed-step	ode4	0.01
None	VehicleFixed05ms	Fixed-step	ode4	.0005
None	VehicleFixed5s	Fixed-step	ode4	5.0

Change Solver Configuration Settings

During simulation, if your virtual vehicle model fails to converge, you might want to change the solver configuration settings for data objects in the VehicleConfig.sldd data dictionary. For help choosing a solver, see Choose a Solver.

To change the solver settings for a data object:

1. In the Model Explorer, navigate to the VehicleConfig.sldd data object configuration setting that you want to change. For example, navigate to Simulink Root > ConfiguredVirtualVehicleModel > External Data > VirtualVehicleTemplate > Configurations. Select the data object VehicleVariable.

2. In the right pane of the Model Explorer, click Open.

   

3. In the Configuration Parameters left pane, select Solver. Specify new solver parameter settings for the data object. For example, for VehicleVariable, change Solver from ode23tb to odeN.

   

4. Click OK. The data dictionary contains the modified solver settings for the data object.