pwarszawski 8d1d9eec9b AI braking: smaller steps, earlier, while approaching a stop or a lower speed ...

Changes to how the AI works the train brake on the way to a lower speed
or a stop, so that it uses few, early applications instead of a late
deep one:

- Approaching a lower speed, the deceleration may fall short of the
  demand by only half of a step (fBrake_a1) before the brake is applied
  harder. With a full step the demand crept up meanwhile and a long G
  train got its next step many seconds too late.
- The shortfall is checked every 3 s. If it keeps growing at a handle
  left alone for longer than the brake takes to respond, the AI adds a
  small step at once instead of waiting until the margin calls for a
  deep one. A shortfall that shrinks on its own (brake still filling,
  blocks gripping harder at lower speed) does not trigger it.
- Releasing, a position short of the first one counts as giving the
  minimum stage of the distributor, not less.
- Holding the speed on a descent, the predicted excess speed is taken
  off over the time the brake takes to respond, not at once, so a slow
  brake does not get a deep application that then takes as long to
  release.

2026-11-07 18:10:47 +01:00

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