Truck Models

Enter truck data to calculate acceleration, deceleration, axle loading, and fuel burn.

Add and edit truck models for the project.

Truck List

Add, remove, and reorder trucks in the project using the top left button ribbon.

Add, remove, and reorder trucks.

Truck files can be downloaded from the Alastri truck library.

Axle Data

Axle data is used to calculate road friction forces and TKPH on tires during travel.

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.

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

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.

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);

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;

A rimpull curve is a graph of rimpull versus velocity. 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.

Haul Infinity uses the rimpull curves and the axle weights to derive an acceleration from the current vehicle speed.

Retard Curve

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

Fuel Curve

Fuel curves match the fuel rate to the engine load.

Haul Infinity uses this to calculate total fuel burned on each haul cycle.

Trolley Assist Rimpull

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