any way to tell what gear you are in??? (eletrical signal/sensor?)
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From: central, nj, usa
any way to tell what gear you are in??? (eletrical signal/sensor?)
is there any sensor or signal that tells the car what gear it is in?
i have an idea for some leds and such, and i need to know what gear i am in for it to work.
is there any way? perhaps rpm/speed?
i have an idea for some leds and such, and i need to know what gear i am in for it to work.
is there any way? perhaps rpm/speed?
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From: Charlotte, NC
Re: any way to tell what gear you are in??? (jbell)
No sensor for manuals.
WARNING: OVERLY COMPLICATED SOLUTION FOLLOWS!
Your idea for the RPM/speed is a good one. You could program a simple PIC controller to do a quick calculation and select the right "window" for the ratio of speed and rpm. It would then turn on the appropriate LED, or whatever you like.
WARNING: OVERLY COMPLICATED SOLUTION FOLLOWS!
Your idea for the RPM/speed is a good one. You could program a simple PIC controller to do a quick calculation and select the right "window" for the ratio of speed and rpm. It would then turn on the appropriate LED, or whatever you like.
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From: central, nj, usa
Re: any way to tell what gear you are in??? (drdisco69)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 »</TD></TR><TR><TD CLASS="quote">No sensor for manuals.
WARNING: OVERLY COMPLICATED SOLUTION FOLLOWS!
Your idea for the RPM/speed is a good one. You could program a simple PIC controller to do a quick calculation and select the right "window" for the ratio of speed and rpm. It would then turn on the appropriate LED, or whatever you like.</TD></TR></TABLE>
yea, thats the only idea i had. however there would be problems i think.
does anyone have the ratio sizes on a b16 so i can figure this out in excel?
WARNING: OVERLY COMPLICATED SOLUTION FOLLOWS!
Your idea for the RPM/speed is a good one. You could program a simple PIC controller to do a quick calculation and select the right "window" for the ratio of speed and rpm. It would then turn on the appropriate LED, or whatever you like.</TD></TR></TABLE>
yea, thats the only idea i had. however there would be problems i think.
does anyone have the ratio sizes on a b16 so i can figure this out in excel?
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From: Charlotte, NC
Thread Starter
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From: central, nj, usa
Re: any way to tell what gear you are in??? (drdisco69)
bah. this wont work. look at this for example:
1st gear, 3300rpm = 15.56599628mph.
2nd gear, 2100rpm = 15.56196277mph.
things like tire wear could completely throw all those decimals off too.
1st gear, 3300rpm = 15.56599628mph.
2nd gear, 2100rpm = 15.56196277mph.
things like tire wear could completely throw all those decimals off too.
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Re: any way to tell what gear you are in??? (jbell)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jbell »</TD></TR><TR><TD CLASS="quote">bah. this wont work. look at this for example:
1st gear, 3300rpm = 15.56599628mph.
2nd gear, 2100rpm = 15.56196277mph.</TD></TR></TABLE>Yeah, what's wrong with that?
1st gear, 15.566/3.3 = 4.72 mph per 1000 rpm
2nd gear, 15.562/2.1 = 7.41 mph per 1000 rpm
That's a big enough difference that tire wear won't hurt you.
That's how a Saab Viggen 'knows' it's in 1st or 2nd, so it can limit torque. That car doesn't have any physical sensors on the tranny either.
1st gear, 3300rpm = 15.56599628mph.
2nd gear, 2100rpm = 15.56196277mph.</TD></TR></TABLE>Yeah, what's wrong with that?
1st gear, 15.566/3.3 = 4.72 mph per 1000 rpm
2nd gear, 15.562/2.1 = 7.41 mph per 1000 rpm
That's a big enough difference that tire wear won't hurt you.
That's how a Saab Viggen 'knows' it's in 1st or 2nd, so it can limit torque. That car doesn't have any physical sensors on the tranny either.
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From: central, nj, usa
Re: any way to tell what gear you are in??? (JimBlake)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake »</TD></TR><TR><TD CLASS="quote">Yeah, what's wrong with that?
1st gear, 15.566/3.3 = 4.72 mph per 1000 rpm
2nd gear, 15.562/2.1 = 7.41 mph per 1000 rpm
That's a big enough difference that tire wear won't hurt you.
That's how a Saab Viggen 'knows' it's in 1st or 2nd, so it can limit torque. That car doesn't have any physical sensors on the tranny either.</TD></TR></TABLE>
oh. shiiiit, i didnt think of that. hrrrrm.. i wonder how i go about programming all this. i know dick about this stuff. aw man.
1st gear, 15.566/3.3 = 4.72 mph per 1000 rpm
2nd gear, 15.562/2.1 = 7.41 mph per 1000 rpm
That's a big enough difference that tire wear won't hurt you.
That's how a Saab Viggen 'knows' it's in 1st or 2nd, so it can limit torque. That car doesn't have any physical sensors on the tranny either.</TD></TR></TABLE>
oh. shiiiit, i didnt think of that. hrrrrm.. i wonder how i go about programming all this. i know dick about this stuff. aw man.
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From: Charlotte, NC
Re: any way to tell what gear you are in??? (jbell)
A simple IF THEN routine should do it.
Find the ratio between speed and rpm or some other distinct ratio, and apply it to a list of known ratios. We'll call the ratio of the speed and rpm R, and the gear we are in G. This is an example using wrong numbers but the right idea, as best I can tell:
If 4.5 > R > 5.0 then G = 1
If 7.0 > R > 7.5 then G = 2
and so on. Like JimBlake pointed out, each gear gets a certain number of mph per 1000 rpm. Find that ratio for each gear and you're done.
Find the ratio between speed and rpm or some other distinct ratio, and apply it to a list of known ratios. We'll call the ratio of the speed and rpm R, and the gear we are in G. This is an example using wrong numbers but the right idea, as best I can tell:
If 4.5 > R > 5.0 then G = 1
If 7.0 > R > 7.5 then G = 2
and so on. Like JimBlake pointed out, each gear gets a certain number of mph per 1000 rpm. Find that ratio for each gear and you're done.
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From: Winnetka, Calif, USA
Re: any way to tell what gear you are in??? (jbell)
This sort of thing has been done on bicycle monitors for quite some time.
The Shimano "flightdeck" monitors compute the speed of the pedals based on the fact that it knows the bicycle speed (from a sensor), the gear ratios (entered data), tire size (entered data), and what gear you are in (a sensor at the shift levers). From all that, the unit can compute the pedal speed (assuming you are not free-wheeling).
It's all in the math.
You would need to know the vehicle speed and also engine speed. You would have to have a data base giving the gear ratios and also the tire diameter.
I think you should also think about having the unit sense if the clutch is depressed or not!
Wes
The Shimano "flightdeck" monitors compute the speed of the pedals based on the fact that it knows the bicycle speed (from a sensor), the gear ratios (entered data), tire size (entered data), and what gear you are in (a sensor at the shift levers). From all that, the unit can compute the pedal speed (assuming you are not free-wheeling).
It's all in the math.
You would need to know the vehicle speed and also engine speed. You would have to have a data base giving the gear ratios and also the tire diameter.
I think you should also think about having the unit sense if the clutch is depressed or not!
Wes
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From: central, nj, usa
Re: any way to tell what gear you are in??? (drdisco69)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 »</TD></TR><TR><TD CLASS="quote">A simple IF THEN routine should do it.
Find the ratio between speed and rpm or some other distinct ratio, and apply it to a list of known ratios. We'll call the ratio of the speed and rpm R, and the gear we are in G. This is an example using wrong numbers but the right idea, as best I can tell:
If 4.5 > R > 5.0 then G = 1
If 7.0 > R > 7.5 then G = 2
and so on. Like JimBlake pointed out, each gear gets a certain number of mph per 1000 rpm. Find that ratio for each gear and you're done.</TD></TR></TABLE>
oh, i can code in blind, but the problem is... what do i code to? a chip?
Find the ratio between speed and rpm or some other distinct ratio, and apply it to a list of known ratios. We'll call the ratio of the speed and rpm R, and the gear we are in G. This is an example using wrong numbers but the right idea, as best I can tell:
If 4.5 > R > 5.0 then G = 1
If 7.0 > R > 7.5 then G = 2
and so on. Like JimBlake pointed out, each gear gets a certain number of mph per 1000 rpm. Find that ratio for each gear and you're done.</TD></TR></TABLE>
oh, i can code in blind, but the problem is... what do i code to? a chip?
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From: Cincinnati, OH, USA
Re: any way to tell what gear you are in??? (jbell)
Check out the Uberdata forums.. some guys over there scripted something for Uberdata that tells you the gear, and such.. They've got it pretty good.
http://www.ecimulti.org/uberdata/forum
http://www.ecimulti.org/uberdata/forum
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