BMW S62B50

[ragepower]

The quick research I did, Vanos principle is the same of S54 (helical gear). The ECU pin out of S54 says the same thing of on S62 ECU, but on my case it has twice (One for each cylinder bank).

I still have the stock ECU working. So it is possible to measure some data.

James, The software can be modified to use it? About the hardware, with DIY modifications can it handle it? Or it need more hardware like, I/O Extender Board?

If you tell me, with time (a lot of time, I know) and some hardware, MS can control it, we could try.

[jsmcortina]

What frequency.

What MS3 outputs were you thinking of using?

James

[ragepower]

I will know what frequency they operate tonight.

About the outputs. Im not using the inj bank 1 and 2. So I just need 2 more. The software permit Idle and Fidle but I need 2 for idle valve. Im not using the LED output and I will not need them since the MS3 will be in an insulated box (waterprof with relays, BIP,...) and I will not able to see them. And It didn't have IAC output available to use as programmable on/off output? I cannt find they on TS and they were another option that I thought.

EDIT: I just don't know if they can operate to frequency like the others that are available now.

[jsmcortina]

I will know what frequency they operate tonight.

EDIT: I just don't know if they can operate to frequency like the others that are available now.

The existing outputs use "hardware PWM" which is controlled in hardware by the processor and allows for precise PWM duties at high frequencies, BUT there are only so many outputs. Things like boost use lower frequencies and can use "software PWM" which is controlled entirely in software but cannot give precise duties at high frequencies.
That's why I asked what frequency.

James

[ragepower]

I have a little experience with microcontrollers, so I understand the diference.

Since I will start the engine, there are some data that could be important to acquire?

[ragepower]

Ok.

The idle valve have a frequency of 100 hz.

About the vanos valves, it seams that it is not a PWM signal. I measure at idle speed. It can be like 20 seconds without any pulse and next have 1 or 2 pulse of something between 1 and 5 ms. When it happen the engine change a bit its noise, probably the cam angle changing due to this pulses.

What do you need more?

[ragepower]

So, James, what you need more to see if is possible to MS control this VANOS system? Do you need mor information?

[jsmcortina]

The control pulses you mention seem odd, I need to know more about them and the frequency.

James

[ragepower]

Ok

Maybe a video showing that happens would help?

From all research I did, it seams to have this hydraulic system. The oil will be trap on the vanos cylinder.



I did it at low load between 900rpm and 2000rpm and I didn't see any frequency.

What kind of information you need more?

[ragepower]

Or, in vvt systems, it is normal to have a PWM signal with 0% duty-cycle when the cam is on pretended angel? I thought that in PWM signal is really unusual to use 0% duty-cycle, it would have minimal 1% or less.

[AbatelliCristian]

I think the same system of the s54 engine.
When I have make the first test in s54 engine I noticed this:
If open vvt1 and closed vvt2, degress advanced.
If vvt1 and vvt2 is colsed, degress is stationary.
If vvt1 closed and vvt2 open, degress retard.
The shift is not as fast as S65 engine.
Perhaps a standard PID control is not appropriate because of the slowness of the hydraulic system.

Unfortunately I could not finish the test because the car was still to be completed, but I hope that within 1-2 weeks I can do other tests.
1-2 days and upgrade you if I can make new test in s54 engine.

[AbatelliCristian]

a possible solution:

if angle+tollerance < target vvt1duty=100% vvt2duty=0
else
vvt1duty=0% vvt2duty=0

if angle+tollerance > target vvt1duty=0% vvt2duty=100%
else
vvt1duty=0% vvt2duty=0

[jsmcortina]

If it really does operate as "bang-bang" control, then that could make is easier to control.

James

[ragepower]

More information

On this link, you can see information about the hydraulic system (thokes82 sent me it) .

http://wenku.baidu.com/view/61edc9c658f ... html?pn=51

Another thing I need to control is the VANOS oil pressure accumulator valve. But is seams that with a programmable on/off output is enough. I think it need activate the valve only when the engine is running.

Tomorrow night I will more test, try to force the OEM ECU control the VANOS, I though on cut a wire of one of VANOS valve, so ECU will try to continuous activate it. And try to understand how the pressure accumulator valve is controlled.

Best regards

[jsmcortina]

That's good information. No mention there of what the electrical control signals look like though. I could really do with seeing scope traces of the two channels of one cam as the engine is operated and the cam angle adjusted.

James

[ragepower]

I only have a analogue scope with one probe. I will try do to my best.

EDIT: What mean with " one cam as the engine is operated and the cam angle adjusted"? For example: one of intake cam of bank 1 and another of intake cam of bank 2? With and without the wire cut?

[jsmcortina]

The SAME cam. E.g. Left inlet. But scope the opening and closing solenoids. Consider a soundcard scope for two channels.

James

[ragepower]

What is the advantage of soundcard scope?

I think that I can get a second probe for this scope (200Mhz capable).

[jsmcortina]

A soundcard scope is an extremely cheap (but crude) two channel scope.

James

[ragepower]

I got a second probe.

I had some problems uploading the video.

I hope to do it today.

A few things about the video: It is really rare to get both vanos signals on the same screen. Or A or B or A after B (this is rare). I tried scales between 5, 2, 1 ms/div but it's hard to catch both on the same screen.

Do you need it to both signals on the same screen?

About the pressure accumulator solenoid, it is operated with a pwm with 100hz and 15% duty-cycle, when the engine is running, like above 300 rpm.