Gear Selector Potentiometer on cbr600?

[Bavarian Motorsport]

Has anyone hooked up a potentiometer to a cbr600 (or any similar engine for that matter) to determine what gear they are in rather then use an algorthym (comparing rpm/speed) to determine what gear you are in?

Thanks

[Bavarian Motorsport]

Has anyone hooked up a potentiometer to a cbr600 (or any similar engine for that matter) to determine what gear they are in rather then use an algorthym (comparing rpm/speed) to determine what gear you are in?

Thanks

[Ali]

Our 2002 gixxer 600 has a similar o/p. 3 wires (2 signal n 1 grnd)) and it's not a potentiometer as i originally thought. 1 wire gives an increasing (but not linear) resistance w.r.t grnd with each upshift. While in gear, the 3rd wire is an open ciruit w respect to grnd. Once in neutral, that 3rd wire is shorted to grnd.

We used a voltage comparator and 7 segment LED circuit. it works, tho I haven't tried it out w the engine running (possible noise inteference)

Hope this helps,
Ali,
NUS FSAE 2004

[Jason Hickman]

the 2001 UF formula car used a rotary potentiometer to determine gear. If I remember correctly, it was gear driven off the shift drum, and we could tell the ecu to display a certain gear per given potentiometer resistance.

Oh yeah... we used an F3

[Bavarian Motorsport]

Alright thanks a lot.

I think I am going to try to get a Rotary potentiometer off the drum as well. Hopefully we can access it without cracking the case, I am pretty sure I can squeeze it in. Then all I do is wire it to our dash and its already configured to read gears (and display) http://fsae.com/groupee_common/emoticons/icon_smile.gif

Thanks again!

[George]

I've done that for our electronic shifter this year. Had its first proper run today, worked really well. Closed loop control with a little atmel microprocessor.

UQ Racing Team Leader 2003
www.uq.edu.au/fsae (http://www.uq.edu.au/fsae)

[A Reinke]

Ali, do you have the resistance values of each gear with the stock selector?

[Bavarian Motorsport]

George, how exactly did you hook it up? Did you have to split the engine and put the sensor inside? or did you just remove the side cover and go through there?

How difficult was it to physicallymount the sensor? Any extra strain on the shifter?

Thanks!

[Bavarian Motorsport]

How did you guys attach the rotary potentiometer to the Gear Drum!?

I was studying it today and saw no safe way to mount it. Using a "band" to drive the Pot is not very safe, and you can't just mount it on the endof the gear drum, so what am I missing here?

TIA

[George]

I welded a gear on to the splined input lever for the shaft, then mounted a pot onto a little bracket. Gives a 3:1 ratio giving a little bit better resolution.

Reading your posts a little more carefully i realised you are talking about have a pot to determine what gear you are in, not when a gear change has been successful. I'm using the one on our engine to determine when a gear change has been successful, and then retract the motor, meaning gear changes are always as quick as possible. Also makes it very easy for the "half shift" into netural.

This picture is a little blurry.. sorry.


http://www.users.on.net/georgec82/shiftergear.jpg


UQ Racing Team Leader 2003
www.uq.edu.au/fsae (http://www.uq.edu.au/fsae)

[Bavarian Motorsport]

Thanks for the picture, I appreciate it.

However our system interprets what gear you are in, it can either compute it from comparing speed to rpm, or by using a dedicated potentiometer input. Basically the only advantage to using the Pot is that you can shift while the car is not running (power on obviously) and know what gear you are in. This means no need for a dedicated nuetral light, and is just easier to see what gear you are in. Also might be a bit more reliable as it wont rely on speed and rpm sensors.

I am trying to design something to use the shift lever system to basically use a small mechanism that will progressively "click" over on a potentiometer (linear or rotary) so it can read on the dash. Basically the Dash inteprets the position of the pot as a gear,to however you calibrate it.

So basically its going to have to have some moving parts, which I am trying to move away from, however it might be the only way if we want to use a Pot as opposed to using the Computation method.

Thanks again http://fsae.com/groupee_common/emoticons/icon_smile.gif

[gug]

just a quick thought.
are you able to use the pot and some electronics to be your "clicker"? every time the pot gets to a certain resistance, the electronics clicks it up or down a gear and then controls the lights on the dash? although i guess you would have to always turn the power on in neutral.

- if it isnt coming, you need a bigger tool.

[Ryan Schoffer]

the problems is that the linkage for the shift lever that actuates the shift drum hides the top of the drum, and the other side is deep within the block

i was thinking you could weld a gear in there if you could fit it between the end of the drum and the linkage, and then run it to the pot, but that seems a shade too complciated

perhaps running a pot off the lever is the best idea?

Vehicle electronics leader

www.ucalgary.ca/fsae (http://www.ucalgary.ca/fsae)