Elvas Tower: Diesel engine with Vacuum brakes - Elvas Tower

Jump to content

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

Diesel engine with Vacuum brakes Rate Topic: -----

#1 User is offline   Coolhand101 

  • Foreman Of Engines
  • Group: Status: Contributing Member
  • Posts: 998
  • Joined: 13-June 15
  • Gender:Male
  • Simulator:MSTS
  • Country:

Posted 18 May 2018 - 07:58 AM

I have a diesel engine that has an engine brake and a train brake.

I have notice that when both type of brakes are included, the engine brake has brake force, but the train brake has no brake force, but has correct vacuum brake readings via the train brake handle( 0 to 21inHg ).

If I omit the engine brake, the train brake works correctly!

Has anyone manage to have both type of brake controllers working under vacuum brakes?

Thanks

#2 User is offline   Smecty 

  • Hostler
  • Group: Status: Active Member
  • Posts: 54
  • Joined: 31-December 08
  • Gender:Male
  • Location:Wellesley, Mass., USA
  • Country:

Posted 18 May 2018 - 05:51 PM

I'm afraid I don't have the answer myself, though I've tried mightily. So there is more than one person interested in getting both brake types to work in ORTS!

Regards,

David

#3 User is offline   darwins 

  • Superintendant
  • Group: Status: Elite Member
  • Posts: 1,222
  • Joined: 25-September 17
  • Gender:Male
  • Simulator:Open Rails
  • Country:

Posted 18 May 2018 - 10:26 PM

View PostCoolhand101, on 18 May 2018 - 07:58 AM, said:

I have notice that when both type of brakes are included, the engine brake has brake force, but the train brake has no brake force, but has correct vacuum brake readings via the train brake handle( 0 to 21inHg ).

If I omit the engine brake, the train brake works correctly!

Has anyone manage to have both type of brake controllers working under vacuum brakes?



There are some limitations with OR at present.

(1) It is possible with vacuum brakes to have a train brake (that operates the brakes on the train only but not the loco) and an engine brake. To do this you should use the following entry for the engine brake:

Brake_Engine ( 0 1 0.25 0
NumNotches ( 3
Notch( 0 0 EngineBrakesControllerReleaseStart ) Comment ( Release )
Notch( 0.25 0 (EngineBrakesControllerRunningStart ) Comment ( Lap )
Notch( 0.50 0 EngineBrakesControllerApplyStart ) Comment ( Apply) ))


You might want to put this further up:

Comment ( == Independent Brake valve - Locomotive == )
EngineBrakesControllerMaxSystemPressure( 21inHg )
EngineBrakesControllerMaxReleaseRate( 10inHg/s )
EngineBrakesControllerMaxApplicationRate( 10inHg/s )
EngineBrakesControllerMinPressureReduction ( 2inHg )


(2) It is not possible in OR with vacuum brakes to have a train brake that operates the engine brakes and the train brakes at the same time as in real life.

This means you will need to choose between train brakes only or train brakes with a completely independent loco brake.

Some suggestions to make the train brake controller more realistic on diesels might be:

(i) For a vacuum brake only loco

BrakesTrainBrakeType( "Vacuum_single_pipe" )

Brake_Train ( 0 1 0.15 0.3
NumNotches ( 5
Notch( 0 0 TrainBrakesControllerFullQuickReleaseStart ) Comment ( Release )
Notch( 0.15 0 TrainBrakesControllerReleaseStart ) Comment ( Running )
Notch( 0.3 0 TrainBrakesControllerSelfLapStart ) Comment ( Lap )
Notch( 0.45 0 TrainBrakesControllerApplyStart ) Comment ( Apply )
Notch( 0.6 0 TrainBrakesControllerEmergencyStart ) Comment ( Emergency ) ))


(ii) For a dual braked loco ( using vacuum brakes )

BrakesTrainBrakeType( "Vacuum_single_pipe_eq" )

Brake_Train ( 0 1 0.1 0.2
NumNotches ( 6
Notch ( 0 0 TrainBrakesControllerFullQuickReleaseStart ) Comment ( Release )
Notch ( 0.1 0 TrainBrakesControllerReleaseStart ) Comment ( Running )
Notch ( 0.2 0 TrainBrakesControllerMinimalReductionStart ) Comment ( Intial or First Application )
Notch ( 0.3 1 TrainBrakesControllerContinuousServiceStart )
Notch ( 0.8 0 TrainBrakesControllerFullServiceStart ) Comment ( Full Service )
Notch ( 0.9 0 TrainBrakesControllerEmergencyStart ) Comment ( Emergency ) ))


Unfortunately the names of 'tokens' that must be used in OR to represent the controller positions for vacuum braked locos do not always correspond to the names of the controller positions. (Hence the comments used above.)

#4 User is offline   Coolhand101 

  • Foreman Of Engines
  • Group: Status: Contributing Member
  • Posts: 998
  • Joined: 13-June 15
  • Gender:Male
  • Simulator:MSTS
  • Country:

Posted 20 May 2018 - 04:06 AM

Thanks

I only tested two diesel engines in tandem. That explains why the train brake had no brake force( still correct vacuum pipe reading ) while the engine brake did.

I've had vacuum brakes working on my DMUs for a couple of years. In the same period on diesel engines, the vacuum took way to long to be created with more than 4 wagons attached to the engine. An exhauster would of been fine back then.

I think we need a test set up for a diesel engine on vacuum brakes, making use of all the new vacuum features?.

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

1 User(s) are reading this topic
0 members, 1 guests, 0 anonymous users