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Title: ignition timing me7.5 Post by: fgtskofd on December 15, 2015, 04:45:32 PM hi all new to the forum, and ecu
just a quick question about why on the ME7.5 it has optimal ignition timing and also ignition timing maps, and whats the variant 2... thanks Title: Re: ignition timing me7.5 Post by: nyet on December 15, 2015, 04:48:18 PM just a quick question about why on the ME7.5 it has optimal ignition timing and also ignition timing maps That doesn't have a quick answer; it is a complicated topic. Optimal timing is not used to generate actual timing; it is used as a reference to calculate torque efficiency. The explanation of the latter term is not a noob question; you have some reading to do first. Quote and whats the variant 2... Also doesn't have a quick answer; it depends on the context. In the case of timing, variant is usually to reflect different cam timing. In two point timing, the ECU will switch between the two maps depending on cam position In variable timing, the ECU will interpolate between the two maps. Title: Re: ignition timing me7.5 Post by: Lost on December 15, 2015, 11:53:34 PM Jumping on this one
But all 1.8 T does not have camswich? Hense variable 2 is not used. Is there any list of which ones does and does not have this function, if not how do you determ it? Title: Re: ignition timing me7.5 Post by: nyet on December 16, 2015, 12:01:35 AM Jumping on this one But all 1.8 T does not have camswich? Hense variable 2 is not used. Is there any list of which ones does and does not have this function, if not how do you determ it? Could also be auto/tip Title: Re: ignition timing me7.5 Post by: dream3R on December 20, 2015, 09:05:19 PM This was written by bosch, doesn't explain the switch over though but it's the most concise thing I've read.
Quote The ignition timing zwgru from the basic ignition-timing calculation is corrected by the timing dzwwl for the warming-up run and the cylinder-specific timing dwkrz of the knocking control. The basic ignition timing zwbas is given that is identical to the most advanced ignition timing that is possible. This ignition timing forms the input for the torque implementation MDZW that supplies the ignition timing zwsol as the output. # This ignition timing is limited to the most advanced or most retarded ignition timing that is possible. In the case of active torque interventions (B nozwe = B zwappl = B sa = 0), the ignition timing thereby obtained is used for zwist. If the torque interventions have been deactivated (B nozwe or B zwappl = 1), then the basis ignition timing zwbas is used; for trailing throttle fuel cutoff, the most retarded ignition timing that is possible zwspae. zwist is finally corrected by the phase error and limited to the values that can be outputted by the system. The output ignition timing zwout is given. The single component of zwout is formed for safeguarding the ignition timing as the input variable of function surveillance and saved in zwoutcpl. |