[cesarbl]

Here's an example using Darwin's controller:

ORTSTrainDynamicBlendingTable(
    0 (0 0 300km/h 0)
    0.2 (0 0 300km/h 0)
    0.3 (0 0.4 300km/h 0.4)
    0.4 (0 0.7 300km/h 0.7)
    0.5 (0 1 300km/h 1)
    0.8 (0 1 300km/h 1)
    1 (0 0 300km/h 0)
)

Brake_Train ( 0 1 0.1 0.2
NumNotches ( 8
Notch ( 0       0 TrainBrakesControllerReleaseStart )  Comment ( Release / Running )
Notch ( 0.2  0 TrainBrakesControllerEPHoldStart )  Comment ( Hold EP )
Notch ( 0.3  0 TrainBrakesControllerEPHoldStart )  Comment ( Regeneration I )
Notch ( 0.4  0 TrainBrakesControllerEPFullServiceStart  )  Comment ( Regeneration II and EP )
Notch ( 0.5  0 TrainBrakesControllerEPFullServiceStart ) Comment ( Regeneration III and EP )
Notch ( 0.6  0 TrainBrakesControllerHoldStart ) Comment ( Lap Air )
Notch ( 0.8  0 TrainBrakesControllerFullServiceStart ) Comment ( Apply Air )
Notch ( 1.0  0 TrainBrakesControllerEmergencyStart ) Comment ( Emergency ) ) )

Probably this is a good moment to allow custom labels for Notches. This would be useful both for notched throttle and brake controllers. The only problem I see is with i8n, but we have already broken that with ORTSLabel, so I think we can do it here too.

[Laci1959]

Hello.

https://kephost.net/p/OTg0MTk4.png
Characteristic curve of the wheel traction force of the Bombardier TRAXX locomotive. From the training material issued for locomotive drivers.

https://kephost.net/p/OTg0MTk3.png
Characteristic curve of the electric braking force appearing on the wheels of the Bombardier TRAXX locomotive.

Sincerely, Laci1959

[darwins]

It is interesting to see both the traction curve and the dynamic brake curve together. That gives a good clue to guessing the braking curves for locomotives that we can not find published curves for.

[darwins]

cesarbl, on 16 September 2023 - 11:34 PM, said:

Probably this is a good moment to allow custom labels for Notches. This would be useful both for notched throttle and brake controllers. The only problem I see is with i8n, but we have already broken that with ORTSLabel, so I think we can do it here too.

Yes please. http://www.elvastower.com/forums/public/style_emoticons/default/clapping.gif

[cesarbl]

How about something like this?

Brake_Train ( 0 1 0.1 0.2
NumNotches ( 8
Notch ( 0       0 TrainBrakesControllerReleaseStart ORTSLabel ( "Running" ) )
Notch ( 0.2  0 TrainBrakesControllerEPHoldStart  ORTSLabel ( "Hold EP" ) )
Notch ( 0.3  0 TrainBrakesControllerEPHoldStart ORTSLabel ( "Regeneration I" ) )
Notch ( 0.4  0 TrainBrakesControllerEPFullServiceStart ORTSLabel ( "Reg. II EP" ) )
Notch ( 0.5  0 TrainBrakesControllerEPFullServiceStart ORTSLabel ( "Reg. III EP" ) )
Notch ( 0.6  0 TrainBrakesControllerHoldStart )
Notch ( 0.8  0 TrainBrakesControllerFullServiceStart )
Notch ( 1.0  0 TrainBrakesControllerEmergencyStart ) ) )

[darwins]

Looks good. So many brake controllers that would be useful for. Also some throttles and some gear changes and maybe some other controls.

[pschlik]

Custom labels would be a great thing to have. It's all too easy to find situations where the default notch text isn't what you need.

[akioyamamura]

Another cool feature would be a delay between the controller and the brake effort, since the brake reacts in realtime what is unreal.
Something similar to the RateOfChangeUpRPMpSS and RateOfChangeDownRPMpSS would be great to simulate this behavior.

[darwins]

Thanks. It seems this is working for train brakes like this:

Brake_Train ( 0 1 0.01 0.50
NumNotches ( 5
 Notch ( 0.0 0 TrainBrakesControllerOverchargeStart ORTSLabel ( "RELEASE" ) )
 Notch ( 0.2 0 TrainBrakesControllerReleaseStart ORTSLabel ( "RUNNING" ) )
 Notch ( 0.5 0 TrainBrakesControllerHoldLappedStart  ORTSLabel ( "LAP" ) )
 Notch ( 0.7 0 TrainBrakesControllerFullServiceStart ORTSLabel ( "APPLY" ) )
 Notch ( 1.0 0 TrainBrakesControllerEmergencyStart ORTSLabel ("EMERGENCY") ) ) )

but not for independent brakes like this:

 Brake_Engine ( 0 1 0.1 0
NumNotches ( 4
 Notch ( 0.0   0 EngineBrakesControllerReleaseStart ORTSLabel ( "RUNNING" )
 Notch ( 0.3   0 EngineBrakesControllerHoldLappedStart ORTSLabel ( "LAP" )
 Notch ( 0.7  0 EngineBrakesControllerApplyStart ) ORTSLabel ( "SLOW APPLICATION" )
 Notch ( 1.0  0 EngineBrakesControllerEmergencyStart ) ORTSLabel ( "QUICK APPLICATION" ) ) ) )

[Weter]

Hello.
I have missed this discussion somehow.
May I know: is it documented anywhere? or can it be documented.
Is it included to testing version's code already?
Or, at least, what all numbers mean:
0 (
0 0
300km/h 0
)

[Albertosaurio65]

0 (                   //Throttle %
            0 0            //speed vs force (m/s - N)
            300km/h 0     //speed vs force (kmh - N)
        )

For things like this:

[Weter]

Thanks, Alberto,
Do I catch it right, these are minimal (zero) speed and Maximal speed to force ratio pairs for every lever's position, which form each "table's" entry?

[cesarbl]

I would like to propose yet a new feature regarding train dynamic brake blending. Typically, dynamic braking is not effective at low speeds. Thus, when the train brake controller demands an amount of dynamic braking, the resulting dynamic brake force would be quite low. This could be quite disturbing since the braking force is suddenly reduced. To avoid this, some locomotives replace this dynamic brake with engine brakes at low speeds.

Implementing this has been in my mind for some time, but I thought it was rather specific. However, this function has been implemented by at least 3 european manufacturers: Alstom, Bombardier and CAF.

I now have a working beta for this. It would be activated by a single token to be added in the engine section of the .eng file. I propose one of the following names for the token:

- ORTSTrainDynamicBlendingAirReplacement
- ORTSDynamicBrakesReverseBlending

Choosing an adequate name for the feature is more difficult than the implementation, so any feedback is welcome.

[Csantucci]

My 5 cents: ORTSDynamicBrakeReplacementWithEngineBrake

[Weter]

Hello.
Looks like long-awaited feature.
Not only locomotives, but electric commuter trains, metro EMU and trams widely use this.
Sometimes (and most usually), it's actuated by further dynamic brake's range notch (before "Emergency"), called, say, "TR"; sometimes this is added automatically, according to DB's current drop.

Anyway, this is called here "Substitution of dynamic brake", also, electropneumatic valve, responsible for adding friction brakes in that case is called "Substitution valve".

Thanks for Your labors, Cesar!