BMW S62B50

[AbatelliCristian]

Hi guys,
I think monday I can make new test in s54.
Ragepower, how many tooth do you have in cam? the decoder is equal s54?

[ragepower]

AbatelliCristian: these are mine cam decoder

https://www.dropbox.com/s/45yrvb24ux6aq ... 9.png?dl=0

James, these are the videos I made. The upper line is the inlet, the bottom the outlet. The scale is 10v/div.

I had done a mistake, has changing the ms/div (between 1, 2, 5 ms) . I has trying to get both pulses. When the line is continuous is a 1 ms. I notice the pulse width was almost the same.

https://www.youtube.com/watch?v=YSfA8WV ... e=youtu.be

On this, I just change between, 1 and 2 ms.
https://www.youtube.com/watch?v=lZ-XaPr ... e=youtu.be

Do you need more videos?

EDIT: Doing thing without time, turn in to mistakes. On videos, both are for the same cam (inlet), the upper is the advance, the bottom is the retard.

[thokes82]

Additional Info:
On S52 and S50 Euro-Models (same controll) I am seeing in Diagnostic-mode approx. 150ms from one extreme to the other...
S50 has only the inlet cam vanos controlled but the principle with the two valves is the same.

[ragepower]

Thank you thokes82

James: do you need more information/scope?

Another thing I will need is high-side drivers for vanos solenoids and a few more things.

After searching on the internet, I found this circuit on diyautotune:



Is it enough or it need to be something specific?

[ragepower]

Hi james

Will it possible MS to control this vanos since it can control a S54 vanos?

Is TIP125 enough to vanos solenoids?

[jsmcortina]

The control code works, so that's a start. Handling 8 PWM outputs is the technical challenge here. Luckily they work ok at 20Hz.

James

[ragepower]

Great. Like I said before, If you accept the challenge, I want to help you.

First tell me if the tip125 is enough to vanos control, so I can procced with the hardware.

These are the outputs I need, besides the injectors and igniton coils:

- 8 vanos (20Hz, high-side)
- 2 Idle (3-hire idle valve 100hz, low-side)
- 1 vanos pressure accumolator solenoid (100hz with 15% Duty-cycle on a generic PWM output, high-side)
- 3 on/off outputs (fan, shift-light (optional))

[ragepower]

OK I have knock module, so I can't use led outputs right?

So ms has available output from,

- 2 iac
- 6 mid output from ms3x
- 2 inj from main board
-1 f idle

Am I thinking right?

So I don't have output for on/off output, fan and shift lights. But I can run the engine.

For v12 engines the header on ms3x pk7 and pm2 are used, right?

Can you make them available? With them I have all output that I want.

[jsmcortina]

There are not plans to open up those two V12 pins as general purpose outputs. It does sound like you have just got enough I/O for this monster VANOS install.

I believe the TIP125 could drive the VANOS, but I've not wired one up myself.

James

[jsmcortina]

AbatelliCristian: these are mine cam decoder
https://www.dropbox.com/s/45yrvb24ux6aq ... 9.png?dl=0

Effectively the same as S54 from the look of it.

James

[jsmcortina]

I've implemented the four pairs of VVT outputs now.

James

[ragepower]

Great

I was thinking use the output these way:

- idle valve => inj bank 1, inj bank 2
- vanos valves => ms3x mid output and iac 1, iac 2
- vanos oil pressure accumulator valve => f idle

These way I don't need to modify the main board, besides the tip125 I just need to add a transistor to drive the tip125 on iac output.

Any disadvantage on this?

For more output only with a CAN board from Jpgref (don't remember the correct spelling), right ?

[thokes82]

@ragepower: what is the electrical resistance of the valves? That way you can estimate the pure static power consumption. I think a flyback circuit would be required. Other than that a tip125 should be sufficient.

[ragepower]

@ragepower: what is the electrical resistance of the valves? That way you can estimate the pure static power consumption. I think a flyback circuit would be required. Other than that a tip125 should be sufficient.

I measured 4 ohm, note that there is a diode on vanos unit. I switched the multimeter tips and measure the same.

Since they are high-side controled, it is necessary a flyback circuit? Or is a flyback diode enough?

[Peter Florance]

@ragepower: what is the electrical resistance of the valves? That way you can estimate the pure static power consumption. I think a flyback circuit would be required. Other than that a tip125 should be sufficient.

I measured 4 ohm, note that there is a diode on vanos unit. I switched the multimeter tips and measure the same.

Since they are high-side controled, it is necessary a flyback circuit? Or is a flyback diode enough?

I think it depends on how BMW controls it. If the stock waveforms are just square wave (likely) diodes should do it.

[thokes82]

13.2V/4Ohm
=3.3A

You could start with a diode as it is not high frequency and control is just by slow bit-banging...

[jsmcortina]

13.2V/4Ohm
=3.3A

You could start with a diode as it is not high frequency and control is just by slow bit-banging...

From what I've read before and is posted above - the VANOS unit already has the diode built in.

James

[ragepower]

Here you can see the inside of vanos unit. It may help. I had measured the same solenoid, both ways, and the result as the same. 4ohm.

If there is a diode, the measure should me diferrent, or am I wrong?

[jsmcortina]

I see four diodes !

See also Mario's post in the other VANOS topic.

James

[ragepower]

Ok.

About the transitor to drive the tip125 on IAC output. A BC337 or a 2N3904 is enough?