OD2 (ELSD) Solenoid - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 30 (permalink) Old 03-10-2011, 12:23 PM Thread Starter
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OD2 (ELSD) Solenoid

I've been trying to figure out how the OD2 Electric Limited Slip Differentials work. With the end result of installing them in a non QD2 and using a switch and relay to turn the lockers on and off.
Sounds easy, or simple? I have a ELSD solenoid I'm playing with a simple 12vdc power applied to it doesn't do a thing to the solenoid.
Looking in the service manual, it appears these solenoids are controlled by the Final Drive Control Module and it sends power in the form of PWM (Pulse-width modulation) at a1khz frequency and then applying a 0 to 100% duty cycle.
My question is for all the electrical savey forum members. Can a simple PDM controller running at 1khz, for changing the speed of a DC motor or for changing the intensity of LED lights be used to turn on the solenoid?
I assume a potentiometer would provide adjustment form 0 to 100 load? If so it would be set at 100. A switch could then be used to turn the PWM on and off, and you would end up with a selectable locker.

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post #2 of 30 (permalink) Old 03-10-2011, 04:25 PM
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I have QDII and studied this issue deeply and I made a box with two switches to kill the ELSDs for sand driving, and I wanted to improve it to add manual control and stopped at knowing that it works on PWM signal, although I thought a constant 12V would work since the 100% duty cycle PWM signal is actually a contact signal ,,, see this diagram :




I'm happy and interested that you managed to get hold of the Solenoid for testing, Are you sure you applied the correct polarity?

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post #3 of 30 (permalink) Old 03-10-2011, 07:34 PM Thread Starter
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Quote:
Originally Posted by Ahmed View Post
I have QDII and studied this issue deeply and I made a box with two switches to kill the ELSDs for sand driving, and I wanted to improve it to add manual control and stopped at knowing that it works on PWM signal, although I thought a constant 12V would work since the 100% duty cycle PWM signal is actually a contact signal ,,, see this diagram :




I'm happy and interested that you managed to get hold of the Solenoid for testing, Are you sure you applied the correct polarity?
Not sure on the polarity, but I tried it both ways. Attached is the wiring diagram from the service manual. Switched Battery Solenoid Supply (Dark Green/Yellow) I believe is (+) and Front Differential Solenoid Control (Dark Green/Dark Blue) I believe is (-) and is turned on and off at 1khz frequency. And like you show the duration of "on" dictates percent of duty from 0 to 100.
And I would have thought 100% duty would be a contact signal as well. but appears not to be. How do voltage and current affect all of this?
Attached Files
File Type: pdf 2006 Service Manual Pg 127.pdf (35.6 KB, 171 views)

06 Red Jeep Commander 3.7L V6 "Manual QT2", RC 2" w/ Rusty's 1/4", 1-1/4" Wheel Spacers, Rubicon Moab Wheels, Grabber AT2 LT265/70-17 tires, Rocky Road Supersliders, Fastman Throttle-body, K&N Cold Air Filter, JBA Shorty Headers, Front Tow Hooks, 2" towing receiver front & rear, Wired for winch front & rear, ARB Onboard Air, Trans Temp Gauge, Aux Trans Cooler, Sport Roof Crossbars, Skid Plates, RS5010 Rear Shocks, JKS 2034 Front & 2001 Rear Disconnects
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post #4 of 30 (permalink) Old 03-10-2011, 10:03 PM
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What was your 12V source?

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post #5 of 30 (permalink) Old 03-12-2011, 05:57 PM Thread Starter
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I used an automotive 12vdc battery, a 12vdc power supply and 9vdc battery. Swapping leads on all. I tested the solenoid for the correct resistance before and after, it reads 13.5 ohms, which is in spec per the service manual. The only thing I can think of is a solenoid made for PWM power requires a square wave power source. Is 12vdc the correct voltage, maybe 5?

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Last edited by cmdr jim; 03-14-2011 at 08:07 AM.
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post #6 of 30 (permalink) Old 03-14-2011, 12:59 AM
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The automotive 12vdc battery should definitely be valid source and no its not a 5V , its 12V

then it needs a PWM signal ,,,, Are you handy to built a small electronic circuit to do that?

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post #7 of 30 (permalink) Old 03-14-2011, 08:13 AM Thread Starter
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Quote:
Originally Posted by Ahmed View Post
The automotive 12vdc battery should definitely be valid source and no its not a 5V , its 12V

then it needs a PWM signal ,,,, Are you handy to built a small electronic circuit to do that?
I have been looking for some PWM controllers. I see a lot of them for driving DC motors, computer fans and then some led lights. I would think one of these would work, if the frequency was right for the solenoid. The xk service manual states 1khz for this solenoid, does that sound right? Most of the controllers I can find are 100hz. Also I guess a potentiometer is used to control load duty 0% to 100%?

So far this is the only PWM controller I found that is adjustable to 1khz:
http://www.sparkfun.com/products/9668

06 Red Jeep Commander 3.7L V6 "Manual QT2", RC 2" w/ Rusty's 1/4", 1-1/4" Wheel Spacers, Rubicon Moab Wheels, Grabber AT2 LT265/70-17 tires, Rocky Road Supersliders, Fastman Throttle-body, K&N Cold Air Filter, JBA Shorty Headers, Front Tow Hooks, 2" towing receiver front & rear, Wired for winch front & rear, ARB Onboard Air, Trans Temp Gauge, Aux Trans Cooler, Sport Roof Crossbars, Skid Plates, RS5010 Rear Shocks, JKS 2034 Front & 2001 Rear Disconnects

Last edited by cmdr jim; 03-14-2011 at 08:22 AM.
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post #8 of 30 (permalink) Old 03-14-2011, 08:23 AM
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I have the same service manual and yes it says 1khz and that looks ok ,, 100Khz is too high for such function. and yes some circuits use potentiometer to play with the duty cycle.

I will also try to look for some simple circuits to do that, its been around 10 years since my last hands on electronic circuits back in collage though

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post #9 of 30 (permalink) Old 03-14-2011, 09:26 AM Thread Starter
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Cool, I'm sure there is a circuit out there to build, I'm a mechanical engineer, so I'm electrically challenged......

I also have an email into this company, maybe another source:
http://www.pololu.com/

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post #10 of 30 (permalink) Old 03-14-2011, 10:49 AM
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This looks super interesting. I am also keen to find a way to lock the centre diff manually on sand/gravel as it adds substantial stability. Please keep us informed.

cheers
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