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Title: Calibration Interface vszw Post by: phila_dot 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). Title: Re: Calibration Interface vszw Post by: Gonzo 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 Taken from: http://nefariousmotorsports.com/forum/index.php/topic,778.0.html==================================== 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. Title: Re: Calibration Interface vszw Post by: phila_dot 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? Title: Re: Calibration Interface vszw Post by: TTQS on November 09, 2011, 06:18:34 AM 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? ;D TTQS Title: Re: Calibration Interface vszw Post by: NOTORIOUS VR on November 09, 2011, 10:00:48 AM Does this PDF help at all?
Title: Re: Calibration Interface vszw Post by: phila_dot on November 10, 2011, 03:53:18 PM 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. Title: Re: Calibration Interface vszw Post by: phila_dot on December 16, 2011, 04:43:11 PM VS_VERST Variables
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