atsf37l, on 07 May 2020 - 11:39 AM, said:
With the MaxVelocity in the .eng file set at 70MPH the loco will top out around 69.8 regardless of the 90 MPH track speed.
Thanks for confirming my suspicions.
As part of some OR code review on diesel locomotives this is the MaxVelocity parameter that I would like to get a consensus on what to do with it.
In the current code for a BASIC configuration (ie no TF curve table) , once the max velocity figure (in eng file) is reached the TF is set to zero. For an ADVANCED configuration (ie with TF curve tables), it will be as per the modellers configuration of the table.
As best as I can make out in
real life, typically the TF does not appear to go to zero in a single step, rather the value decays as the speed increases past the max velocity, and the power decreases accordingly. So I believe that to set a zero step decrease at max velocity is incorrect. I can understand this happening if there was a TCS which trigger a power shutdown.
So the question is,
again in real locomotives, what speed does MaxVelocity equate to? Is it the "maximum design speed"? Secondly what happens when this speed is reached, does TF go to zero, does it decay, or are the traction motors and gearing transmissions destroyed because of over speed?
I think that the two MaxVelocity values need to be treated as different values as follows:
i) MaxVelocity (ENG) - this is a performance parameter in terms of what the locomotive is capable of. It should not be an operational parameter. For example the locomotive might be capable of performing at a high speed, but for a specific operational requirements the railway company will set a lower operational speed.
ii) MaxVelocity (CON - or wherever) - this is an operational parameter and as such should be treated differently to the value above, and depends upon train operational requirements rather then train capabilities.
Does anybody know whether the TCS system can "cut power" above certain speeds? If so, in the BASIC configuration, I would like to change the OR code so that above the MaxVelocity (design speed) the TF ramps down, rather then going straight to zero. The TCS could override this as a monitoring safety measure.
Thoughts?