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In the presence of regenerative braking (for Battery Power trucks), this remains to be the normal non regenerative brakes.
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Regen Force curves show the braking force at the rim is in kilograms force, at different ground speeds, while fully utilizing the regenerative brakes.
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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.