Staged extra Injector control + other goodies design. Input wanted

[Aries_Turbo]

Quote:

Originally Posted by Joryn Rodney is a great guy He's given me the part numbers for the 3 and 4 bar which are pressure sensors from Freescale...who are more then willing to give out free samples if you only want a small quantity of parts hehe. So I've got 15 sensors on their way, 5 each in 36, 44 and 58 PSI ranges That should definitely cover me for that side of things anyways. I guess I'm going to have to go to the jy sometime soon to see if I cant find and tear apart a ford controller. Anyone know the theory behind these injector control drivers? ie: are they jsut relays, or power FETS or what? Once again any info is good info

hey can I get my hands on those part numbers? I would like to mess around with those sensors when i build a megasquirt myself.

Brian

[Joryn]

Quote:

Originally Posted by Aries_Turbo hey can I get my hands on those part numbers? I would like to mess around with those sensors when i build a megasquirt myself. Brian

MPXH6250AC6T1 36 PSI
MPXH6300AC6U 44 PSI
MPXH6400AC6T1 58 PSI

They look to be a pretty nice unit. Can't wait to get my hands on them

[Aries_Turbo]

thanks man!!

Brian

[Joryn]

Quote:

Originally Posted by Putter The injector drivers are just good old transistors, but they are big enough to hande injectors, and one will do a few amps for the coil. Fords do use high impedance inj though so a dodge fuel injector may burn out a ford driver eventually. Also if you find the pulse width modulated blower controllers, they have a heatsync and transistor that will handle around 20amps continuous, they're quite large.

Hmm, if it's just a transistor I may look into just getting the parts off of digikey or something like that. How much current runs through our injectors?I imagine that's the only real constraint to teh transistor chosen.

I just had a thought here. The cold start injectors normally used for these operations are meant for a constant on operation right? If we are looking to use PWM to control them perhaps using a normal injector would be a better choice? Mounting them would be a little more difficult but I'm sure we can be creative with that. Is this a good option? If a regular injector can support a lot more fuel then a cold start then I wouldn't even need to worry about supporting too many. ie: if 2 regular injectors provide more fuel then 4 cold starts that could make the design a bit easier.

Any thoughts on this idea? I know that people have talked about using regular injectors before but I don't recall any definitive answer coming out of the deal.

[Putter]

The ford injectors are about 16ohm impedance, drivers are sized accordingly with some room to spare.

[Joryn]

Quote:

Originally Posted by Putter The ford injectors are about 16ohm impedance, drivers are sized accordingly with some room to spare.

So at 12V the ford drivers are looking at somewhere around 750 mA. What are the chrysler injectors running for impedance? If I looked into transistors >2A capable would that be sufficient?

[Putter]

X-ler uses low impedance in the turbo cars, I think they are around 1.6ohms? I know they'll peak about 5amps on the pull coil.

I'm sure a local tv shop or radio shack could find you bulk packages of new parts for not a whole lot of money that are suited to exactly what you need. TV shops are an awesome thing to have around sometimes.

[Joryn]

I've got some new toys that came in yesterday and today. They include several Pressure sensors from freescale and some microcontrollers that I plan on using for this little project. Here's some nice pics to maybe get people psyched lol

[Putter]

Holy smokes, this is going to have more computing power than apollo.....

[Joryn]

Quote:

Originally Posted by Putter Holy smokes, this is going to have more computing power than apollo.....

Lol, well hopefully I won't be needing All those micro's. They are kind of a collection of a few different ones in case I have...problems heh. I've had a few burn out and I'm just prepared that's all.

Although in theory if I use everyone I should have enough micro's and sensors for like 11 controllers hehe. Yay!

[Aries_Turbo]

Hey Joe,

how did you request some sample sensors from freescale? Thanks

Brian

[Joryn]

Quote:

Originally Posted by Aries_Turbo Hey Joe, how did you request some sample sensors from freescale? Thanks Brian

You'll have to create an account at freescale first. It's nothing serious and you don't need to be a company or anything, so don't really worry about that. With those part numbers I gave you you can search form them and then there should be an option to "order samples". Once you'r there it's as simple as checking out the cart that you have filled (with as many parts as you can find on there) and the nice thing is the price will be $0.00 heh.

If you can't get an account setup for whatever reason let me know and I can probably add your address to my account and let you use it (PM me if this is the case).
It's pretty straight forward though and it shoudl arrive in a couple days. I'm always amazed at how fast they ship those samples out heh.

Hope it helps

[90TurboVan]

I just visited the TD forums today for the first time in months, and this thread got me to register. I am currently working on a project of about the same idea. Only differences that I can see are that I am trying to use an Embedded 80386 computer and a 12 bit ADC and multiplexer to get data from sensors.

I also had a few more ideas for uses, but they might make the system a little to complex for what everyone here is talking about. If you were to put sensors on the front wheels and back wheels for speed, you could have the controller effectivly learn the best boost "curve" to eliminate wheelspin. Also, the computer could act as a turbo timer, safety controller for the boost (no boost on a cold motor, no boost if the computer sees a problem elsewhere), and many other uses. That is part of the reason I decided to use a 386 instead of a microcontroller (a little faster).

I don't have a degree in EE (actually I'm still in high school, please don't laugh ) but I do have a lot of electronics experience and I'm learning to program assembly, which would be needed for any controller.

I just love projects like this and I would like to help in any way i can.

[Joryn]

Quote:

Originally Posted by 90TurboVan I just visited the TD forums today for the first time in months, and this thread got me to register. I am currently working on a project of about the same idea. Only differences that I can see are that I am trying to use an Embedded 80386 computer and a 12 bit ADC and multiplexer to get data from sensors. I also had a few more ideas for uses, but they might make the system a little to complex for what everyone here is talking about. If you were to put sensors on the front wheels and back wheels for speed, you could have the controller effectivly learn the best boost "curve" to eliminate wheelspin. Also, the computer could act as a turbo timer, safety controller for the boost (no boost on a cold motor, no boost if the computer sees a problem elsewhere), and many other uses. That is part of the reason I decided to use a 386 instead of a microcontroller (a little faster). I don't have a degree in EE (actually I'm still in high school, please don't laugh ) but I do have a lot of electronics experience and I'm learning to program assembly, which would be needed for any controller. I just love projects like this and I would like to help in any way i can.

Sounds like good stuff. The microcontroller I"m using only has a 10bit adc with 8 channels but that should be plenty of resolution over the 0-5V range that most of these sensors operate in. As for speed at 20-40Mhz it should be alright, but I guess we'll see when it gets put together Which hopefully will be sooner rather then later.

I like the speed sensor idea, although having sensors on all 4 tires would be redundant. One on the front and one on the back for reference would probably be sufficient. I should note that I had already been thinking of a safety system for this controller as well (probably somewhere's near the beginning of the thread actually) and it's hopefully going to be one of the main features. For me I would really like something that will automatically shut off boost if knock gets too high, a/f too low, etc.

Good to see another interested party. What were you thinking of using for injector control? Were you looking at cold starts? Regular injectors? maybe running alcohol and running a mister setup? I'm starting to lean towards an alcohol system run on regular injectors, but it all depends on what parts and time I can scrounge up for testing.

Best of luck to you and I look forward to seeing what you come up with...EE degree or not Have a blast!

[Aries_Turbo]

sweet, just ordered some sensors.