Jason McNeil Posted August 23, 2015 Share Posted August 23, 2015 About a week back @robca brought up that a higher rate than 10 samples/sec (10Hz) may not be sufficient to capture the subtle variations of power demands from the battery pack, especially under high load. To test what the optimal settings are, I've run the same stretch of hill (75m on a 20° avg incline) under a low (10Hz) & a high precision (50Hz) capture settings.To validate the capture rate, the output should be able to record gradations, rather than sudden swings in output when magnified at around 1/10th of a second.In this first output, it show the power profile over .32secs. This may seem like a blink of the eye, but there are enormous leaps in the power requirements. The highlighted section is .021 secs of magnified detail of the next slide.Over the course of the .021sec interval has 13 data points, but the precision between some of them, like 8 & 9, is a bit crude & does not reveal the complete picture. This sample rate might also miss important micro-leaps that can occur at a higher sample rate.Now using the 'high-precision' capture rate of 50Hz & focusing on a section of the power profile with a high degree of swing.Again there are thirteen data-points but the capture range is only .004, an absolutely incredible amount of precision/resolution. Notice that the connections between points more predictably & flow like, no sudden reversals between three given points.It would seem then, at a 50Hz, the capture rate is sufficient (but not 10Hz) to analyze the power profile in any given eWheel/EUC system, or in other words, that @Robca was correct! Link to comment Share on other sites More sharing options...
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