Calibration Interface vszw

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phila_dot

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	Calibration Interface vszw « on: November 08, 2011, 05:08:35 PM »

How can we take advantage of the calibration interface vszw in ZUE from VS_VERST?

Is it possible to tune ignition angle live using the calibration interface?

Does anyone know what equipment is required for this (VS20?, VCDS?)?

vstdzw (TKMWL) also a calibration interface in ZUE, but this is one of the adaptation channels (lemmi).

Function VS_VERST is the only information that I could find in the FR.

Quote from: Funktionsrahmen

VS VERST 2.40 Calibration parameters for McMess

FDEF VS VERST 2.40 Function definition

Position | Label | adjustment variable | Initial Value | Size | limit | Quantity / Increment | raster |% section
1 | vszw | firing angle | 0 KW |Byte |-96..95.25 KW | 0.75 KW | | ZUE

%VS VERST describes the parameters to be adjusted by means of McMess. The effects of the adjustment are described in the pertinent
sections on the individual functions (refer to above table in %Section).

The RAM cells are set once to the initialization values given above for the following conditions:

1. C ini
2. For B mcacti = 0 (McMESS is not active ). B mcacti is updated in the 1-sec time frame.
3. For entry and exit in McMESS communication (item 3 not applicable as required, corresponds to item 2).

If CWVSV = 0 VS VERST isn‘t active. Only for CWVSV > 0 adjustment with McMess is possible.

APP VS VERST 2.40 Application hint
The updating of the adjustment values is dependent on the McMess communication (approximate value: about every 30 ms).


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Gonzo

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	Re: Calibration Interface vszw « Reply #1 on: November 08, 2011, 09:11:32 PM »

I assume you need to a way to interface with McMESS first.

I think its pointless:

Quote

The Bosch McMESS-Protocol in the ME7
====================================

The McMESS protocol is a proprietary protocol of Bosch. It is a calibration protocol
for the K-line (should be same use case as the CAN calibration protocol CCP).
McMESS is used in the process of tuning and optimizing the ECU for a certain combination of
engine and vehicle model. Normally a special application system of the vehicle manufacturer
will communicate with the ECU using McMESS over the K-line.

The name of the protocol would mean something like "microcontroller measurement protocol",
so "mess" stands for measurement (in german: "Messung"). But I think the english term "mess"
is quite good - it's just a mess. McMESS is a braindead, obfuscating protocol implementation.
It uses: 9bit transfer - hard to achieve on a PC, but possible when abusing the parity bit,
10400baud and 125000baud communication speed - the latter not possible with a standard PC serial port
(could be possible with USB-Serial converters or special serial itf cards or when using a microcontroller).

Mainly, the protocol provides the possibility to read and write values in the RAM, also while the engine
is running (change parameters in the ECU, log variables), but the reachable speed is not very high
(270..1000bytes/second). So most of this is not very interesting for normal tuning/logging purposes.

Taken from: http://nefariousmotorsports.com/forum/index.php/topic,778.0.html


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phila_dot

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	Re: Calibration Interface vszw « Reply #2 on: November 08, 2011, 09:47:17 PM »

Thanks.

I remember that thread, but never really read the attachment.

It does look basically useless for logging, but I think it would be very useful on the dyno.

Live tuning without emulation, what drawback am I missing?


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TTQS

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	Re: Calibration Interface vszw « Reply #3 on: November 09, 2011, 06:18:34 AM »

Quote from: phila_dot on November 08, 2011, 09:47:17 PM

Live tuning without emulation, what drawback am I missing?

A 2 million Euro engine dyno cell as shown on page 22 of Engine Management: Advanced Tuning by Greg Banish? Grin

TTQS


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NOTORIOUS VR

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	Re: Calibration Interface vszw « Reply #4 on: November 09, 2011, 10:00:48 AM »

Does this PDF help at all?


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Google Talk: NOTORIOUS.VR
n00bs start here: http://s4wiki.com/wiki/Tuning

phila_dot

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	Re: Calibration Interface vszw « Reply #5 on: November 10, 2011, 03:53:18 PM »

Quote from: NOTORIOUS VR on November 09, 2011, 10:00:48 AM

Does this PDF help at all?

Thanks. The documentation linked in this thread is all that I have been able to find and the FR refers to a VS20.

It sounds like maybe setzi has already put something together for this while working out his logger. I would try to put something together, but I have no idea where to start as far as communicating with the ECU.

Hopefully someone who has experimented with this will chime in.


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phila_dot

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	Re: Calibration Interface vszw « Reply #6 on: December 16, 2011, 04:43:11 PM »

VS_VERST Variables

\|Position	\|Label	\|Adjusting Variable	\|Initial Value	\|Variable	\|Limit	\|Quant./Inc	\|Frame	\|Section	\|Notes
1	vszw	Ignition timing	0° KW	Byte	-96 - 95.25°KW	0.75 ° KW		ZUE	Added to ZWAPPL to adjust zwbas
2	vsfrk	Mixture factor	1.0	Byte	0.75 - 1.25	0.001953		ESGRU	Multiplier for FRKAP (multiplier for KFLF)
3	vsvw	Advancement angle	0° KW	Byte	-768° - 762°	6° KW		ESVW	Additive for weenst for injection angle
4	vsns	Nominal speed	0 RPM	Byte	0 - 2550/min	10 RPM		LLRNS	Additive for nsol (idle reference speed)
5	vszwkr[0]	Ignition timing firing 1	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[0] for dwkrz[0]
6	vszwkr[1]	Ignition timing firing 2	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[1] for dwkrz[1]
7	vszwkr[2]	Ignition timing firing 3	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[2] for dwkrz[2]
8	vszwkr[3]	Ignition timing firing 4	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[3] for dwkrz[3]
9	vszwkr[4]	Ignition timing firing 5	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[4] for dwkrz[4]
10	vszwkr[5]	Ignition timing firing 6	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[5] for dwkrz[5]
11	vszwkr[6]	Ignition timing firing 7	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[6] for dwkrz[6]
12	vszwkr[7]	Ignition timing firing 8	0°	Byte	-96 - 95.25°KW	0.75 ° KW		KRRA	Added to wkr[7] for dwkrz[7]
13	vske	Knock detection threshold	0	Byte	-8 - 8	0.0627		KRKE	Additive to kek
14	vsdmr	Torque reserve	0 %	Byte	0 - 99.6%	0.3906%		MDKOL	Additive to mifal
15	vsfpses	Manifold air pressure	1	Byte	0 - 2	0.0078		AES	ps_w (int. manifold press) multiplier in calc. of inj on time
16	vsrlmx	max.rl for LDR	0%	Byte	Conv.: rel sb q0p75			LDRLMX	Additive to rlmax_w
17	vsldtv	TV LDR for appl. control	0%	Byte	Conv.:tv ub q0p64			LDTVMA	Becomes input for KFLDRL?
18	vswnws	Angle NW for VANOS	0°	Byte	wkw ub q0p25	0.25 ° KW		WNWEIN	Not documented


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