Road Slope Analysis and Filtering for Driveline Shuffle Simulation
In powertrain analysis, simulation of driveline models are standard tools, where
efficient and accurate simulations are important features of the models. One input signal with
high impact on the accuracy is the road slope. Here it is found that the amplitude discretization
in production road-slope sensors can excite vehicle shuffle dynamics in the model, which is
not present in the real vehicle. To overcome this problem road-slope information is analyzed
with the aid of both measured and synthetic road profiles, where the latter are generated from
regulatory road specifications. The analysis shows that it is possible to separate vehicle shuffle
resonances and road-slope information, and designs are proposed for on- and off-line filtering
of the road-slope-sensor signal in spatial coordinates. Applying the filter to measured data
shows that vehicle shuffle is significantly attenuated, while the shape of the road slope profile is
maintained. As a byproduct the use of smoothing the rolling resistance is shown.
Andreas Myklebust and Lars Eriksson
2012
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