Resize Engines and Electric Motors

Use the Virtual Vehicle Composer app to:

• Resize an engine based on desired maximum power or total displacement.

• Resize an electric motor based on desired maximum power and torque.

Note

Use these Virtual Vehicle Composer app-based workflows to evaluate system-level performance, economy, and emissions. To develop plant controls for engines and motors, consider using the dynamometer reference applications. For more information, see Calibrate and Resize Engines and Electric Motors.

Resize Engine

For a virtual vehicle configured with a conventional or hybrid electric vehicle (HEV) powertrain architecture, you can resize the engine based on a desired maximum engine power or engine displacement.

Suppose you have set up your virtual vehicle in the Virtual Vehicle Composer app and want to take its 1.5-liter 4-cylinder SI Engine and resize it to a 1.0-liter 3-cylinder. Follow these steps:

1. In the Data and Calibration pane, select Engine, and then click the Engine Resize tab, as shown.

   

2. Select a Resize Option:

   • Power — Enter the Desired maximum power

   • Displacement — Enter the Desired displacement

   For either Power or Displacement, set the Desired number of cylinders.

   For this example, set Resize Option to Displacement, set Desired displacement to 1.00, and Desired number of cylinders to 3.

   Depending on your Engine, the resize options may enable additional architecture and performance parameters.

3. Select Resize Engine. The Virtual Vehicle Composer app resizes the engine and adjusts the calibration parameters.

4. To see the performance characteristics of the resized engine, click Plot Performance.

   • Steady-state engine performance.

     

   • Performance plots, including the engine speed, engine torque, and fuel mass flow rate.

     

Resize Motor

For vehicles configured with battery-electric or hybrid-electric powertrain architecture, you can resize its motors based on desired maximum power and torque values.

Suppose you have set up an Electric Vehicle 1EM in Virtual Vehicle Composer. You want to resize it to 160 kW and 320 N-m. Follow these steps:

1. In the Data and Calibration pane, select Electric Machine 1, and then click the Motor Resize tab.

   

2. Specify the Desired power [W] and Desired torque[ Nm] values. For this example, enter 160000 watts and 320 N-m.

   Note

   Keep the motor resize ratios for maximum power and torque to less than ten. For greater ratios, resize in steps. For example, to take a motor with 320 kW maximum power and 640 N-m maximum torque, and resize it to 20 kW and 40 N-m:

   • Resize from 320 kW and 640 N-m to 80 kW and 160 N-m

   • Resize from 80 kW and 160 N-m to 20 kW and 40 N-m

3. Click Resize Motor. The Virtual Vehicle Composer app resizes the motor. Review the resized motor performance characteristics and efficiency map.

   

4. Click Run Performance Tests to see the performance characteristics of the resized motor, including motor torque.