Author Topic: TDI pump with electronics but without the VW computer.  (Read 2862 times)

December 24, 2009, 04:19:44 pm

DieselVanagon

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TDI pump with electronics but without the VW computer.
« on: December 24, 2009, 04:19:44 pm »
Is there an alternative to the MTDI pump by controlling the pump electrically but simplified without a VW computer?

1. What is in detail is controlled in the TDI system.
1.1 Fuel amount!
1.2.Injection timing?
1.3 Injection duration?
1.4 what else?
1.5 Intake pressure via Turbo blow by

2.What in detail are the inputs?
2.1 Temperature
2.2 Throttle position
2.3 Speed
2.4 gear position
2.5 Intake pressure




Reply #1December 24, 2009, 05:16:31 pm

svenakela

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Re: TDI pump with electronics but without the VW computer.
« Reply #1 on: December 24, 2009, 05:16:31 pm »
I've been reading through a bunch of repair manuals and the documentation for the electronic system. And I think it's pretty easy to control the pump, specially if an m-TDI is the thing to compare. Actually, controlling the stuff on the pump is not a bigger problem that it can be done with a simple PIC and some extra components.
I will have a TDI pump over in a while, so I've been thinking of taking the PWM valves of and do a test with an Arduino (micro processor board) to control them. I'll start with the simple stuff, just to try it out and if it works as I think it does.
My idea was to make a simple controller that takes the motor temp, RPM to start with, then add manifold pressure and air temp (then an Air Flow Meter isn't necessary. That's how a Megasquirt works).
And then I'll extend the functionality, like temp/pressure compensation, glow control etc. At least that's the plan - first of all I need some spare time. :)

There's no throttle position, but there's a "gas pedal" position. Speed and gear is not checked in the early controllers.
Sullivan's page is a great source, there's a TDI spec PDF published: http://www.haywood-sullivan.com/vanagon/TDI/tdi-technik-eng.pdf



Regards,
Sven

Reply #2December 27, 2009, 12:33:13 pm

jtanguay

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Re: TDI pump with electronics but without the VW computer.
« Reply #2 on: December 27, 2009, 12:33:13 pm »
Dilligent Inc. sells some programmable micro-controller boards... they are also expandable which gives you the ability to control most anything.

The micro controller boards offer inputs of either analog or digital, and outputs of analog or digital. In theory it wouldn't be impossible to connect the sensors to the input of the microcontroller, and then write some code for it. Certain outputs would need to be connected for it to work, such as analog for the fuel throttle control on the pump, and timing mechanism. Given the amount of work required, it would be easier to just get all the wiring and ECU for that specific motor, but the limitless configuration of using your own microcontroller is very appealing to some, namely me :)

An underlying issue, however, is the fact that since you now have 100% control over every aspect of the system (theoretically) then there are no safeguards in place to limit the possible destruction of the engine. Much testing using trial and error would be necessary to even come close to what the VW engineers have done in their testing labs.  ;)

One little neat bonus to using one of these microcontroller boards, is the ability to connect a display and have the code display relevant info. Imagine replacing your cluster with a digital LCD screen showing you EGT's (connected to an analog input on the controller  ;)) boost, air intake temp, fuel temp, timing, fuel injection quantity, as well as all the other relevant info! Me likes!!!

But then again, that big old factor that seems to get in the way all the time... MONEY!!!  >:(


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