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    Driveline Tool

Driveline Tool

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  7. Driveline Tool

1. Accessing the Driveline Tool
  1. Go to the PBS tab.
  2. Click the Driveline button.
  3. Click the ⚙️ gear icon to open the settings panel.
    driveline_button_annotated.png
  4. Hover over the Driveline Button to get detailed test readings
  5. After Running the color of the button will change to Green(pass) or Red(fail), in the hovered view you can identify which of the tests passes/failed.

Note: The settings dialog is split into two sections:

  • Test Parameters
  • Vehicle Parameters
Functions Overview
overview_pannel.png
2. Test Parameters

Changing any Test Parameter will invalidate the existing results for the current vehicle version.
(If you only swap vehicle parts, existing results won’t be overwritten, new changelog version will be generated instead.)

Parameter

What it Does

Air Temp, Humidity, Test Altitude

Affects air density → impacts aerodynamic drag (biggest effect at high speed).

Road Type

Affects how well the wheel can grip the ground (force applied by wheel without slipping

Aerodynamics

Body style (e.g. Road Train, Open-Top Van).

Clutch Torque Ratio

Percentage of torque transmitted when the clutch is not fully engaged

Time Step

Simulation time step (e.g. 20 ms).

Starting Gear

Initial gear for acceleration tests only.

Shift Strategy

e.g. Sequential, Automatic (only for acceleration).

Gear-Shift Delay

Delay between shifts (only for acceleration).

3. Vehicle Parameters

Quick-swap interface for components that change often:

  • Engine (dropdown)
  • Transmission (dropdown)
  • Final Drive Ratio (input)

This will generate new vehicle changelog version to store the driveline result.

4. Tyre Configuration

It is recommended to load in the correct tyre from the Quick Loader panel to ensure all tyres have consistent sizing. A new tyre can be created from the Equipment Editor tool. When doing so, it is recommended to input prescribed and standard tyres rather than manually entering custom figures.

To edit a tyre in Hevispec (Not Recommended):

The tyre size and parameter settings directly affect test results. To ensure consistency and accuracy, the same tyre modification needs to be applied to all tyres—drive tyres to drive tyres, other tyres to other tyres. Having different tyre sizes across the vehicle will lead to inconsistencies in simulation and test outcomes.

In the 3D view, click on the tyre you wish to modify. This will open its settings in the Other Properties panel.

  1. Standard Tyre

    • Choose a predefined size (SAE/ATMR).
    • Toggle Is Standard Tyre on → applies default radii & rolling-resistance.

  2. Custom Radius

    • Toggle Is Standard Tyre off.
    • Manually set Unloaded Radius & Loaded Radius.

  3. Full Custom

    • Set Tyre Size dropdown to Custom.
    • Manually enter all tyre parameters.
5. Viewing Results

For Icon location, please refer to the Function Overview image

A. Vehicle Overview Panel
  • Bottom-left of the main screen: quick summary of driveline results.
B. Detailed Simulation Results Table
  1. Open the Simulation Results modal.
  2. Select the Driveline tab.
  3. Adjust filters:
    • Change-Log Version
    • PBS Level, Regulator,

Column

Meaning

Grade A

Maximum grade the vehicle can climb (%)

Grade B

Max speed on 1% grade (km/h)

Startability

Maximum grade the vehicle can start on (%)

Acceleration

Seconds to travel to 100 m (s)

Color-Coding & PBS Levels

  • Green → passes the selected PBS Level
  • “Red Fail” → does not pass
  • Level → The highest PBS level passed

The table always shows the highest PBS Level the vehicle can achieve. If you select Level 2 and the vehicle meets Level 1 criteria, you’ll still see green “Level 1”.