TKPH calculations are used to keep the tyre temperature within safe limits. This is calculated as a function of payload and distance travelled. The formulas used to calculate the TKPH value can be found in the Bridgestone and Michelin OEM handbooks.

Enter TKPH Constraint

Each truck type will have a different TKPH limit depending upon the tyres on the machine.

To create TKPH constraints:

Look up the tyre TKPH limits from the tyre manufacturer. In this example, we will be running CAT 785D trucks with Bridgestone 33.00R51 VRLS E1A tyres, with a TKPH rating of 603.
Navigate to the sample data \NodesVersion folder.
Open SampleModelWithNodes.hinf
Go to Setup tab > Limits step
Select CAT785D from the list of the trucks.
Select the TKPH Limits from the categories
1. Change the Bridgestone constraint to 360.
2. Leave the Michelin constraint at 100,000

Whenever the tyre TKPH rises above 360, Haul Infinity will implement a TKPH delay in the cycle time for the tyres to cool down.

To see the TKPH value on a given haul:

Go to the Network tab.
Find the source node P1\R4\1030 on the floor of the pit.
Right click on the node > Show Path To > Loaded > LiftEntry > WD1\R4\End
Open the Cycle Time Analysis tab.
Scroll down to the TKPH values.
Read the TKPH values for Axle 1 and Axle 2.

Whenever these values rise above a TKPH constraint, then a TKPH delay will be implemented.

Michelin TKPH values require an ambient temperature to be specified. The default is 32°C in Setup > Operating Conditions > "Normal" operating condition.

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