HI. Truck Models

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

1 Truck List
2 Axle Data
3 Curves

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 digitised 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.

Import required trucks to your project

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.

In the newest versions of software ( starting from 22.1) you can also digitise truck data by yourself. Detailed instructions on how to digitise a truck can be found in the section HI. Truck Creator.

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, Trolley Assist Rimpull, Battery Usage, Battery Regen, Regen Force.
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.

In the presence of regenerative braking (for Battery Power trucks), this remains to be the normal non regenerative brakes.

Fuel Curve (For Fuel Power Trucks)

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 if the trucks power source is Fuel (Setup > Trucks > Limits > Power Source)

Calibrate this graph with data from the fleet management system.

This is not needed for use with battery powered truck.

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.

Battery Usage (For Battery Power Trucks)

Battery Usage curves show the power consumption in kilowatts, at different ground speeds, while at full throttle. Haul Infinity uses this to calculate total battery energy used on each haul cycle if the trucks power source is Battery (Setup > Trucks > Limits > Power Source > Power Source Type).

This is not needed for use with Fuel powered trucks.

Trolley Usage (For Battery Power Trucks)

Trolley Usage curve can be used to specify electric motor power usage while on trolley. This will only affect calculations for battery electric trucks.

Battery Regen (For Battery Power Trucks)

Battery Regen curves show the power restore to the batteries in kilowatts, at different ground speeds, while fully utilizing the regenerative brakes. Haul Infinity uses this to calculate total battery energy restored on each haul cycle if the trucks power source is Battery (Setup > Trucks > Limits > Power Source > Power Source Type).

This is not needed for use with Fuel powered trucks.

Regen Force (For Battery Power Trucks)

Regen Force curves show the braking force at the rim in kilograms force, at different ground speeds, while fully utilizing the regenerative brakes.

This is not used to calculate max safe down hill speeds like the retard curve, it’s just used to calculate the amount of the current braking that corresponds to regenerative braking and from that, how much energy is being restored.

This is not needed for use with Fuel powered trucks.