[Coolhand101]

Mike B, on 08 September 2015 - 01:34 PM, said:

For diesels at least, there has been a maximum speed for years. Even old mechanical-pump engines have a governor. The only way to overspeed those engines is to go downhill too fast for the gear you're in, or to try for compression braking using too low a gear (old diesels didn't have much of that absent a "jake brake" modification). My 1981 Rabbit Diesel was spec'd to deliver max power at the governed max of 4800 rpm (1.6l 4-cycle diesel, non-turbo) and could not be driven past that under power. So the max speed in a gear for a diesel-mechanical unit should be at the maximum engine speed (except possibly for high gear, where it might be at a lower engine speed due to aero limiting). If it's not, there may be an error in the .eng file or in ORTS. IIRC, MSTS worked correctly for things like the Kiha diesel car.

Thank you, that's exactly what i'm talking about. The old mechanical DMUs.

[Coolhand101]

Csantucci, on 08 September 2015 - 12:28 PM, said:

There is a sound problem in OR in this behavior. In geared engines Variable2 is proportional to engines RPM, and reaches the maximum value of 1.0 when the maxspeed at the various gears as defined in the .eng file is reached. So if the engine may run at higher speeds than .eng maxspeed, from the .eng maxspeed to the effective maxspeed Variable2 stays at 1 and so the frequency of the motor sound (using a frequency curve) remains constant, which is completely unprototypical.

I got my DMU engine sound to gradually fade when the top gear speed was reached, This was also the cue to change gear, without looking at the RPM gauge. If left to exceed the gear speed. The engine sound was virtually silent
Regarding the cab control. I will post it asap, as I'm not on my pc atm.

MultiStateDisplay (
			Type ( GEARS_DISPLAY MULTI_STATE_DISPLAY )
			Position ( 110 113 8 60 )
			Graphic ( 101-GearLightsA.ace )
			States ( 5 5 1
				State (
					Style ( 0 )
					SwitchVal ( 0 )
				)
				State (
					Style ( 0 )
					SwitchVal ( 1 )
				)
				State (
					Style ( 0 )
					SwitchVal ( 2 )
				)
				State (
					Style ( 0 )
					SwitchVal ( 3 )
				)
				State (
					Style ( 0 )
					SwitchVal ( 4 )
				)
			)
		)

Thanks

[disc]

BTW RPM limiting is can be done already, with RPM vs torque, and RPM vs power tables...

[Coolhand101]

disc, on 09 September 2015 - 02:21 AM, said:

BTW RPM limiting is can be done already, with RPM vs torque, and RPM vs power tables...

I already tried that. Didn't make no difference. I take it OR would of reported a problem if OR engine parameters was not setup correctly ? I did save the engine file for reference.
Perhaps you can point out any errors are suggestions ?

 ORTSDieselEngines ( 1 
                Diesel ( 
                        IdleRPM ( 600 ) 
                        MaxRPM ( 1800 ) 
                        StartingRPM ( 650 ) 
                        StartingConfirmRPM ( 200 ) 
                        ChangeUpRPMpS ( 150 ) 
                        ChangeDownRPMpS ( 200 ) 
                        RateOfChangeUpRPMpSS ( 10 ) 
                        RateOfChangeDownRPMpSS ( 20 ) 
                        MaximalPower ( 224kW ) 
                        IdleExhaust ( 5 ) 
                        MaxExhaust ( 20 ) 
                        ExhaustDynamics ( 10 ) 
                        ExhaustColor ( 00 fe ) 
                        ExhaustTransientColor ( 00 00 00 00 ) 
                        DieselPowerTab ( 
                                0     0 
                                600   44800
                                1800  224000 
                        )  
                        DieselConsumptionTab ( 
                                0  0 
                                600  10 
                                1800 120 
                        )  
                        ThrottleRPMTab ( 
                                0    600 
                                100  1800 
                        ) 
                        DieselTorqueTab ( 
                                0     0 
                                600   7500 
                                1800  29223 
                        ) 
                        MinOilPressure ( 40 ) 
                        MaxOilPressure ( 90 ) 
                        MaxTemperature ( 120 ) 
                        Cooling ( 3 ) 
                        TempTimeConstant ( 720 ) 
                        OptTemperature ( 70 ) 
                        IdleTemperature ( 60 ) 
                ) 
        ) 

[disc]

Coolhand101, on 09 September 2015 - 02:54 AM, said:

Perhaps you can point out any errors are suggestions ?

You have StartingConfirmRPM lower than idle (confirmRPM is the rpm that is reached when starting the engine, then drops to idle.

I've made these tables for kiha 31:

			DieselTorqueTab (
				0  0
				150  25000
				800 40000
				810 1
			)
			DieselPowerTab (
				0  0
				150  20000
				650	140000
				800  110000
				810 1
			) 

So the RPM limiting works(moreover, there is engine braking above 810 rpm), however an RPM range is needed between full power and no power, else the loco starts jerking (probably because of inertia).

[Coolhand101]

disc, on 09 September 2015 - 08:11 AM, said:

I've made these tables for kiha 31:

So the RPM limiting works(moreover, there is engine braking above 810 rpm), however an RPM range is needed between full power and no power, else the loco starts jerking (probably because of inertia).

Ahh i see what you mean. Yes, that should do what i need.

Thanks

[copperpen]

Ist gen DMUs had a freewheel unit between the fluid flywheel and the gearbox which prevented engine overspeeds when running down grade.

[Coolhand101]

copperpen, on 09 September 2015 - 10:41 AM, said:

Ist gen DMUs had a freewheel unit between the fluid flywheel and the gearbox which prevented engine overspeeds when running down grade.

Yes, i believe you had to move the throttle to idle for this to happen?

Just by limiting the DieselTorqueTab to a very low number, and leaving the RPM tab at 100%, as achieved what i wanted for the gears.

I have a little problem that occurs in first gear. When the throttle is fully open from zero speed, the RPMs will rise to max(1800), then between 6 and 8 mph, settle back to around 900 rpms at that road speed. After that, the RPMs behave as normal. Not sure what is causing that.

Also i have another little problem. This worked in MSTS :-

Gear( 0 4 1 4
               NumNotches ( 5
                    Notch ( 1         0 Dummy )
                    Notch ( 2         0 Dummy )
                    Notch ( 3         0 Dummy )
                    Notch ( 4         0 Dummy )
                    Notch ( 0         0 Dummy )
               )
          )
      )

Moving the gear handle pass notch 4, would allow "neutral" from gear 4.

In OR, You cannot preceed further than notch 4. Neutral is only possible from 1st gear?

Thanks

[disc]

Coolhand101, on 09 September 2015 - 11:26 AM, said:

I have a little problem that occurs in first gear. When the throttle is fully open from zero speed, the RPMs will rise to max(1800), then between 6 and 8 mph, settle back to around 900 rpms at that road speed. After that, the RPMs behave as normal. Not sure what is causing that.

Clutch/coupling slipping until the dmu reach the speed where it can be fully coupled. Just like what would happen with a car with manual transmission.

[Coolhand101]

disc, on 09 September 2015 - 01:56 PM, said:

Clutch/coupling slipping until the dmu reach the speed where it can be fully coupled. Just like what would happen with a car with manual transmission.

Does this happen on your modified kiha DMU ?

When the rpm does settle in 1st gear, the tractive effort is "jerking" until 2nd gear is selected.
It appears that high rpm change rate , and this parameter "GearBoxDownGearProportion" affects this. At 1.0 the gears won't settle until almost max gear speed, under 0.25, the gear settle down quicker but the T.E jerks in 1st gear.

Thanks