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VSS using ABS ring and hall effect sensor?
Wondering if anybody has used one of these hall effect sensors with ABS rings on NB driveshafts before?
https://au.rs-online.com/web/p/hall-...ta99fj3APohm3Q Manufacturer recommendations: Tooth height: 5mm Tooth width: 2.5mm Distance between teeth: 10mm Target thickness: 6.35mm NB ABS rings are: Tooth count: 44 Tooth height: 3mm Tooth width: 2.7mm Distance between teeth: 3.5mm Ring thickness: 11.7mm Quite different in most respects, so I'm wanting to know if this will work before committing. Setup is MS3X - plan is to use tableswitchin, tps vref for 5v and spare ecu ground. |
Excuse the metric units, taking a punt here...for sake of example I assumed 250km/h
Sensor maximum speed detection = 15kHz ABS ring OD = 90mm ABS # teeth (n) = 44 v = 70m/s r = 0.045m w = v/r = 1555 rad/s = 14850RPM tooth passing frequency = (w*n)/60 = 10890 Hz tpf < 15kHz so all good in the hood? |
Seems about 100 times as fast as normal miata VSS, pretty sure usually tops out at like 150hz at 160 or so.
PT4 can use a hardware timer and so can read a higher frequency, I use it for a EFR wheel sensor that caps at ~1.5KHz, but there's jack shit documenting when it will cap out. It also updates slow as fuck, as in maybe ~10hz. Otherwise everything else uses software timers and maxes out at like 250Hz from what I've read. Might need to divide the frequency down. |
Thanks, good to know. Also came across below video today.
Key points: - PT4 tested to 2kHz - Tableswitch tops out at 600Hz Also been discussing with a mate, alternative way to look at it: Tyre diameter = 577mm = 0.577m Circumference = 1.812m Revolutions per m = 0.552 Velocity @ 250km/h = 70m/s Revolutions per s = 38.616 Revolutions per min = 2317 by 44 teeth = 1700Hz Within the limits of PT4. He also suggested to use I'll grab one and test to see if it drops out at all on cam input. |
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