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-   -   Quadra-Drive Indicator Light (http://www.jeepgarage.org/f5/quadra-drive-indicator-light-28659.html)

TheNoachSHO 09-17-2011 06:16 PM

Quadra-Drive Indicator Light
 
I've been thinking the last few days. Someone managed to figure out how to create a light to show the MDS on. Has anyone tried making an idicator light to show the differential in "lock". I envison a small picture of the drivetrain with LED's behind each differential that light up to show the E-Locker has been activated.

Anyone try this?

Crestwood1001 09-17-2011 06:23 PM

I'm pretty sure you would need to find a way to get info off of the on board computer.

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JamesLaugesen 06-03-2015 09:50 PM

Re: Quadra-Drive Indicator Light
 
I know this is a very old topic, but I stumbled across it while researching QDII activation/indicators.
I've done a 'prototype' by just tapping into the DC feed to each solenoid.
Details on my blog if anyone is interested;
Jeep WH/WK QDII eLSD activation indicator LEDs prototype | James Laugesen

This rough setup has been good enough for my needs for a while; it's handy to see what the eLSDs are doing in certain situations.

I've been working on a more elaborate project to control the solenoids (aka, control the "locking".), and also determine the differential oil temperature (very inaccurately at this stage.) via the solenoids.
Still the same general concept; just tapping a microcontroller into the DC feed, rather than interacting with the CANbus (which has proved very difficult for the FDCM, it handles most of the QDII logic entirely internally, controlling the components directly.).
The FDCM seems to be quite tolerant of external 'signals' on the solenoid DC circuits, not throwing codes and shutting things down like some other circuits.

ggrassmid 06-10-2015 06:27 AM

Re: Quadra-Drive Indicator Light
 
A user named Valpacer on the other Jeep Forum has done something like this already. I'm not sure if I can link to any of his posts, but I would go there and do a search.

JamesLaugesen 06-10-2015 07:24 PM

Re: Quadra-Drive Indicator Light
 
Quote:

Originally Posted by ggrassmid (Post 1188913)
A user named Valpacer on the other Jeep Forum has done something like this already. I'm not sure if I can link to any of his posts, but I would go there and do a search.

Yeah Dave/Valpacer has wired some switches to force the solenoids on/off for both diffs. Nice simple solution to lock/unlock and proves that the diffs aren't magic, can be retrofitted into a non-QDII vehicle, etc.

I'm controlling mine 'gradually' and read oil (aka solenoid coil.) temperature back, so need the microcontroller in there.

05AKWK 06-10-2015 08:21 PM

Re: Quadra-Drive Indicator Light
 
1 Attachment(s)
I put in the simple method lights like James, followed his instructions actually. I'm a huge fan of this mod, I found out that my 'Service 4WD' message was caused by a bad rear solenoid because of this. saved me a lot of transfer case headache.

JamesLaugesen 06-10-2015 08:57 PM

Re: Quadra-Drive Indicator Light
 
Quote:

Originally Posted by 05AKWK (Post 1189217)
I put in the simple method lights like James, followed his instructions actually. I'm a huge fan of this mod, I found out that my 'Service 4WD' message was caused by a bad rear solenoid because of this. saved me a lot of transfer case headache.

That's cool! Is the green LED in the centre indicating MDS?

05AKWK 06-10-2015 09:04 PM

Re: Quadra-Drive Indicator Light
 
yep, though it seems MDS is disabled whenever other drivetrain trouble codes are present.

JamesLaugesen 06-10-2015 09:13 PM

Re: Quadra-Drive Indicator Light
 
Quote:

Originally Posted by 05AKWK (Post 1189226)
yep, though it seems MDS is disabled whenever other drivetrain trouble codes are present.

Oooh interesting. The MDS logic circuits are insane, looks like it's dependent on almost every other circuit... so that makes sense I guess.

WHHEMI 06-17-2015 06:55 PM

Re: Quadra-Drive Indicator Light
 
Looks like a great mod, for those that have done the mds light have you had to change your driving style much to improve fuel consumption.

ggrassmid 06-25-2015 03:16 PM

Re: Quadra-Drive Indicator Light
 
It'd be cool if someone could make up a series of LEDs to show how locked it actually is.
like 25% 50% 75% 100% locked. I'm sure someone with circuit knowledge could do it as the voltage varies going to the diff solenoid, just need to know how much voltage does what.

JamesLaugesen 07-05-2015 10:00 PM

Re: Quadra-Drive Indicator Light
 
Quote:

Originally Posted by ggrassmid (Post 1194061)
It'd be cool if someone could make up a series of LEDs to show how locked it actually is.
like 25% 50% 75% 100% locked. I'm sure someone with circuit knowledge could do it as the voltage varies going to the diff solenoid, just need to know how much voltage does what.

Sort of... it's 1KHz PWM at 12V, modulated on the ground. But yeah still a simple circuit.
I used 12V LEDs which give some indication of "how locked" the diffs are (just by the brightness of each LED.) and have logged a lot of raw data while I was figuring out the system.

I've driving with the simple LEDs and data logging for a while; I don't think an accurate indication (like an array of specific LEDs.) has much value, as it's only an indication of the solenoid, not necessarily an accurate indication of the diff itself.
The LSD plates are "locked" by pressure from the gerotor pump. The solenoid is only there to release or hold that pressure.

So if you're driving straight in high-range with no wheel-spin, engage low-range, then immediately enter a cross-axle situation.
The solenoids will initially be engaged "100%" (and the LEDs will indicate "100%".) but the LSD will be essentially "0% locked", since there was no pressure built-up by any differential action prior to getting cross-axle'd.

That's just a basic example, in reality it's messier since there's always a bit of pressure pre-loading the plates and always some pressure bleeding off.

Also when in low-range, I've only seen the solenoids go "100%", I haven't seen them do anything other than engage fully.

They do activate gradually in high-range (which makes sense for helping with high-speed wheel spin or whatever.), and the pressure would be quite consistent in this case, but the logic is very conservative. As-in, they release pressure very quickly when differential is reduced.
So I think if you've got wheel-spin for more than a couple of seconds in high-range, you've probably got more important things to do than look at LEDs :lol:.


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