252 Maximum Gradability

The maximum grade that a vehicle will be able to overcome with the maximum force available from the propulsion unit is an important design criterion as well as performance measure. The vehicle is expected to move forward very slowly when climbing a steep slope and, hence, we can make the following assumptions for maximum gradability:

1.The vehicle moves very slowly =┬╗vsO.

2.Fad and Froiiare negligible.

3.The vehicle is not accelerating, i.e., dv/dt=0.

4.FTR is the maximum tractive force delivered by a motor (or motors) at near zero speed. At near stall conditions, under the above assumptions,

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