VSS using ABS ring and hall effect sensor?
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
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.
#2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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?
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?
#3
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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 **** documenting when it will cap out. It also updates slow as ****, 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.
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 **** documenting when it will cap out. It also updates slow as ****, 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.
#4
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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 usecam input table switch, with the filter capacitor removed, he tested on a MAF sensor up to 9kHz, which, if going by my previous calc, would still get to 210km/h (input could potentially take more than 9kHz, unknown at this point)
I'll grab one and test to see if it drops out at all on cam input.
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.
Last edited by MM89; 08-19-2020 at 07:01 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Chris Swearingen
Suspension, Brakes, Drivetrain
68
04-13-2014 02:13 AM