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In the Models step enter truck data to calculate acceleration, deceleration, axle loading, and fuel burn.

Truck List

On the left hand side is the truck list. You can have as many trucks as you would like to evaluate.

Press Add Truck button to add a new truck to your project. You can add a default truck or import it from file or library. You may choose to use a “.ATR” from Talpac, but we prefer the “.opentruck”. These have been carefully digitized and cross-checked straight out of the manufacturer's handbook.

There is an extensive library of modern trucks in the truck library on the website. Truck files can be downloaded from the Alastri truck library. If you have a truck that is not in the list let us know and we will digitise and add it in.

If you are querying from a scheduling package, the truck names must match what is in the scheduler.

You can edit names of added trucks, delete, move them up and down in the list, as well as export to “.opentruck” file.

Axle Data

Axle data is used to calculate road friction forces and TKPH on tires during travel. It shows the full and empty weight over each axle, the number of tyres on that axle, and whether it is driven.

  • Each row represents one axle on the truck.

  • A “driven” axle is connected to the drive train.

  • Each axle has a number of tires.

  • Each axle has a loaded and unloaded weight on it.

This is used for the TKPH tyre-loading calculations and full/empty travel times.

Cross-check these values with the equipment manufacturer’s handbook. Make sure to account for any custom tray modifications that affect axle weights.

Curves

  • The available curves are Rimpull, Retard, Fuel and Trolley Assist Rimpull.

  • Turn curves on and off using flags in the Active column.

  • Curves are digitized out of the manufacturer's handbooks. For better accuracy, calibrate with data from your fleet management system.

  • Click in the graph area to manually show a point.

  • Curves can be copied into and pasted from Microsoft Excel using Copy to Clipboard and Paste from Excel buttons.

Rimpull Curve

Rimpull is the amount of tractive force that the engine delivers to the ground through torque on the drive wheels.

Available rimpull is a function of the gear ratios and the rolling radius of the machine. Haul Infinity uses the rimpull curves and the axle weights to derive an acceleration from the current vehicle speed.

Rimpull curves show the propulsion force in kilograms (kgF) against truck velocity (km/h). For mechanical trucks, the rimpull curve shows a characteristic series of humps as the transmission steps down through different gear ratios. Electric trucks typically show a smoother rimpull profile.

T = motor torque;
F = rimpull force;
r = rolling radius of driven tires;
G = gear reduction ratio between motors and driven wheels;
N = number of driving motors; 

T = (F * r) / (G * N);

Electric drive trucks have a smoother profile because there is no gear discontinuity. For electric drive trucks that do not have gears, rimpull can be approximated as the effective engine power divided by the velocity.

P = power;
F = force;
V = velocity;

F = P / V;

Retard Curve

Haul Infinity uses retard curves to calculate the maximum safe braking force without overheating the brakes.

Braking curves show the braking force that the truck should be using at a particular velocity.

This is applied to the segment gradient to calculate when a truck would be unable to stop.

Braking curves are not used to calculate stopping distances. The deceleration properties are set in Setup > Settings > Acceleration.

Fuel Curve

Fuel curves show the fuel consumption in liters per hour at different engine loads. Haul Infinity uses this to calculate total fuel burned on each haul cycle.

Calibrate this graph with data from the fleet management system.

Trolley Assist Rimpull

Trolley Assist provides an (optional) secondary rimpull curve, which is used when trucks cross traverse a Trolley Assisted segment.

Trolley assisted haulage involves feeding power to haul trucks from overhead lines. 

Segments have a trolley property. When toggled on, the truck switches to the trolley rimpull curve while traversing the segment.

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