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Code Issues 144 Wiki Activity

AI braking: take power off when holding the speed uphill near a stop

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Within fMaxProximityDist of a stop, going uphill, the AI holds its speed
with AccDesired = min(0, AccPreferred). control_tractive_force only cut
the power uphill when AccDesired < 0, so an AccDesired of exactly 0 kept
the controller where it was. A consist that came into that range under
power kept full power and crept up to the signal.

Holding the speed uphill on the way to a stop now asks for no speeding
up: power comes off once the train is faster than AccDesired allows.

With the current brake valves this rarely shows: on a 10 per mille climb,
four real-time runs of 32 consists each, the E186 with 25 empty 408W drew
power in 0-14 samples of the last 50 m before and 0-8 after, no overruns
either way. It surfaced once the AI predicted the ESt3 brake closer to
what the valve delivers, where the same train crept to 12 km/h from 40 m
out and overran the signal; with this change it stopped short in all runs.
This commit is contained in:
pwarszawski
2026-11-02 12:36:11 +01:00
parent 8112733e0d
commit 6b82f1471a
1 changed files with 3 additions and 1 deletions
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4
vehicle/Driver.cpp
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@@ -8099,7 +8099,9 @@ void TController::control_tractive_force() {
}
else if( velocity > VelDesired + SpeedCtrlMargin
|| ( fAccGravity < -0.01 ?
AccDesired < 0.0 :
AccDesired < 0.0
// holding the speed uphill on the way to a stop asks for no speeding up
|| ( VelNext == 0.0 && ActualProximityDist <= fMaxProximityDist && AbsAccS > AccDesired + 0.05 ) :
AbsAccS > AccDesired + 10.05 )
|| IsAnyCouplerStretched ) {
// jak za bardzo przyspiesza albo prędkość przekroczona