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02-10-2006, 04:23 PM
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#1
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Registered Member
Join Date: Feb 2006
Posts: 1,480
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Re: Speed Sensor
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Originally Posted by Yoshi
Hello all from Japan.
Thank you for your interest in my SuperMID.
Quote:
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Originally Posted by krousdb
The SuperMID set up for the Prius has a distance parameter value of 2572. If you divide by 3, you get 857. The Prius OEM tire has 855 revs per mile. So my guess is that the Prius speed sensor sends out 3 pulses per revolution. Can anyone tell me if the Honda speed sensors have the same 3 pulses per revolution? If so, since my tires are 840 revs per mile, I will set the parameter to 2520.
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The revolution standard is some what different.
Let's imagine an old mechanical speedometer driven by wire cable.
The industrial standard is 637 revolution for 1km drive.
Hopefully, Honda uses the same standard.
Prius sends 4 pulses per the cabe revolution, which means about 39.25 cm/pulse. ( 100,000 cm / (637 * 4 ) )
The SuperMID M-1 wants 0.01km(10m) resolution, then I programmed it as follows...
A 16bit register accumulates "some value" until it overflowed(value becomes 65536 or over), then increment the 10m memory data. We need 25.48 pulses for 10m drive. ( 1000 cm / 39.25 cm )
The "some value" is 65536 / 25.48 = 2572.
So, please forget to compare the tire sizes between Prius and del sol.
Please compare between standard and your tire on del sol, or it is better to calibrate the display value using your favorite miles-post method. 
Regards,
Yoshi |
Yoshi, Glad to see you here! I will probably leave the default value and change it after 50 miles on my trip odometer. I can get it close anyway. Then I will do the milepost calibration. I can hardly wait!
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