Progressive Water Injection and MS3 without a fast valve.

[bubba2533]

"send a frequency based duty cycle to the small orange wire"

I think it will accept a range of frequency. But it just translates the sent duty cycle to one that can handle more power at a certain frequency that would be best for the motor.

That's my guess at least.

[sjf911]

Well, if that works with the MS3, I'll dump my VC2 controller for it in a heart beat.

[prof315]

Cool circuit. I'm still going to put some energy into making the MS control the meth directly, vs. an in-between box.

I had mine working quite well before I killed my car last week. The mainboard injector drivers on a V3.57 board had no trouble driving the pump and I never noticed any excessive noise being generated.

[prof315]

Cooling mist is selling this now too: http://www.coolingmist.com/pagedisplay. ... Controller

It's kind of expensive but oh well, I bought one. We will see how it goes.

If I'm reading that correctly, it looks like it takes a variable frequency input to convert to duty cycle for progressive injection. Can MS3 provide a variable frequency output between 1 and 1000 hz?

No the Cooling mist controller simply has a freq range of 1-1000 hz. Any PWM signal in that freq range should work so MS shouldn't have any problems with it.

[Token]

Cool circuit. I'm still going to put some energy into making the MS control the meth directly, vs. an in-between box.

I had mine working quite well before I killed my car last week. The mainboard injector drivers on a V3.57 board had no trouble driving the pump and I never noticed any excessive noise being generated.

Sucks to hear that about your car.

I already have meth installed with an in-between box I used (had it made by a place I have other circuits spit out from) with the Emanage Ultimate very very simular to the one Cooling Mist uses. The box I have can use a 0-5vdc input or an injector driver signal (converts ID to a fixed frequency variable duty cycle). I was using the Emanage Ultimate's aux injector driver. I'm just going to move some wires around and get the MS to do the job, and will take logs to see if noise is visible. I have a 3.57 board, I forget if that has a proto area or not. If there is noise I'd like to put a capacitor in to see if that does the job before giving in and keeping the in-between box.

[sjf911]

No the Cooling mist controller simply has a freq range of 1-1000 hz. Any PWM signal in that freq range should work so MS shouldn't have any problems with it.

I got an email back from CoolingMist that the EMS module is nominally for a PWM +5V input.

[93white3400z]

No the Cooling mist controller simply has a freq range of 1-1000 hz. Any PWM signal in that freq range should work so MS shouldn't have any problems with it.

I got an email back from CoolingMist that the EMS module is nominally for a PWM +5V input.

Crap, how can I make this work with an MS3X then ?

EDIT: Actually, just got an email from cooling mist that they updated their doc explaining that :O So apparently it will works fine Their customer support is amazing, replying to email on sunday in about 5 mins :O

[93white3400z]

I made a diagram of how to wire up their controller. David @ CoolingMist approved it and apparently they will add it to their website.

If someone have any idea how to datalog stuff from the 0-5V output on the CM controller, that would be great to add to the diagram

[jsmcortina]

If someone have any idea how to datalog stuff from the 0-5V output on the CM controller, that would be great to add to the diagram

Connect it to one of the ADC inputs and define a "Generic Sensor" input to use that ADC.

James

[93white3400z]

Yeah, pretty easy actually Thanks James, modified diagram to add that.

[sjf911]

So, pin 6 is providing a +5V pulldown source, does this then invert the duty cycle?

[93white3400z]

Apparently... according to the guy at CoolingMist anyway

[sjf911]

We may need the water injection code changed to allow for selection of inversion of duty cycle similar to the idle control setup.

[93white3400z]

We may need the water injection code changed to allow for selection of inversion of duty cycle similar to the idle control setup.

I think the jumper wire with the resistor in the CM box is all we need work with the PWM 5v+ of the CM box. James, what do you think ?

[sjf911]

I have an email into CoolingMist asking them specifically about their expected form of pulse width modulation (length of ground pulse verses length of +5V pulse). Also, a specific test mode for this function would be very helpful.

[coolingmist]

Here is some information the inversion of DC.

The EMS Progressive Controllers measures how long the signal is positive against how long the signal is negative and uses this ratio to compute the duty cycle. If your concern is that the Megasquirt PWM signal will be inverted, meaning when the Megasquirt is outputting 0% the EMS Progressive Controller will be outputting 100%. This is a valid concern.


I don’t know how the Megasquirt output functions, but if your belief is that the DC will be inverted. There are couple of options to correct this:

1) Use an N-Channel transistor (MOSFET), 2 resistors to provide an inversion of the Megasquirt signal.
2) If the Megasquirt has an option to invert the output signal, use this option setting in the Megasquirt setup. (Only the resistor I described previously is required)

I hope this helps.

CM

[sjf911]

Thank you for your reply. It looks to me that the easiest thing to do with the CM controller is to use a generic PWM output rather than the water injection option. It would be nice if we could get the generic PWM outputs enabled for inverted function otherwise one could just invert the values in the table. I would still like to see if we could get a test function added as well.

[93white3400z]

Thank you for your reply. It looks to me that the easiest thing to do with the CM controller is to use a generic PWM output rather than the water injection option. It would be nice if we could get the generic PWM outputs enabled for inverted function otherwise one could just invert the values in the table. I would still like to see if we could get a test function added as well.

Yep, totally agree with that. Hopefully it shouldn't be too hard to add a dropdown "Reverse Ouput" with "Yes" and "No". Test function would be awesome too! Hopefully James and/or Ken are around

[coolingmist]

Ok, been a bit busy but I have some things that should answer all of your questions. Here are simple circuits you can look at for the FSB (EMS controller), you can use any of these depending on your situation.



Also, The orange wire PWM input to the FSB (EMS CONTROLLER) is a high impedance input and only requires a driver rating of 0.001A (1mA). So the 0.02A (PT4) will be more than enough to properly drive the FSB input.

[gndan]

Pro,

You said your Injection system was working well? Are you still using the "Fast" valve setting to control the pump?

,Dan