Patlabor44
I have a pi delta wheel speed sensor that keeps reading 0-5000 mph.  Analysis scaling is set to 0 to 150 mph.The trigger and sensor appear to be in good working order. except for the inaccurate reading.  Any Diagnostic steps i can take to see if the wheel speed sensor is damaged or if its a software issue?
Thanks

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Jake_Hardy
Do you have any data you could upload so I can review it. If not, a screen shot of your problem would be great.

Cosworth Support
Cosworth Electronics 

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racedayengineer
here are the things i would check first:  
 

1. # of wheel speed triggers being used vs whats in the setup:
            - if you are have 5 triggers installed but in the setup you have 6 triggers, then you will have a speed difference of (6/5) = ~ 1.2 mph..  

2. Are all of the wheel speed triggers being picked up by the hall effect sensor?  if it is missing a trigger, then this will skew the output.

3. tire diameter (measured at static since you won't have the transient rolling radius, which the tire manufacturer may or may not have)

4. are you averaging the triggers?  i.e. taking the average of every 4 triggers? 

5. what sampling rate are you logging the speed sensor at?  these sensors, typically, are only good up to 100hz, but i would suggest 50 hz is all you really need.


Heat is another factor that will skew the data as well.  

Hope this helps.


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troberts
Without seeing data this is tricky to diagnose, but if it is spiking from 0 to 5000 then this points to a hardware issue. If the trace looks correct but has 0 to 5000 scaling, then this is more likely to be software issue.

Cosworth Support
Cosworth Electronics 

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