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Code Issues 144 Wiki Activity

AI braking: don't let the running brake test override a stop ahead

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adjust_desired_speed_for_braking_test runs after the target speed was
worked out and overwrites AccDesired. In its third phase it holds the
deceleration near fAccThreshold until the speed has dropped by 8 km/h.
On a 20 per mille descent that application barely holds the speed, so
the phase can last minutes, and a stop signal coming up meanwhile is
ignored. In one real-time run an E186 with 19 container wagons started
the test 1290 m before a stop signal, lost 7 km/h by the signal and
overran it by 274 m after the emergency application.

While the test runs the AI now uses whichever of the two asks for the
harder braking: the test may brake harder than the route needs, never
softer.

Measured in real time, four runs of 32 consists each on a 20 per mille
descent, on the flat and on the descent with half the rail adhesion:
the test no longer runs within 600 m of a stop signal (before: down to
414 m on this branch, and 14 m with the overrun above in a build with
other brake changes), no overruns, stops 8-15 m short of the signal 86,
117 and 83 of 128 (before 90, 117 and 78).
This commit is contained in:
pwarszawski
2026-11-02 16:02:06 +01:00
parent 6b82f1471a
commit 1f3cf4fe56
1 changed files with 12 additions and 0 deletions
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12
vehicle/Driver.cpp
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@@ -7927,6 +7927,10 @@ TController::adjust_desired_speed_for_braking_test() {
if( false == AIControllFlag ) { return; } // TBD: add notification about braking test and enable it for human driver as well?
auto const vel { DirectionalVel() };
// what the route ahead asks for; the test may brake harder than that, never softer
auto const routeaccdesired { AccDesired };
auto const routeaccdesiredgravity { fAccDesiredGravity };
auto const routeveldesired { VelDesired };
switch( DynamicBrakeTest ) {
case 0: {
@@ -7993,6 +7997,14 @@ TController::adjust_desired_speed_for_braking_test() {
break;
}
}
// a stop or a restriction coming up while the test runs takes precedence
if( ( DynamicBrakeTest >= 1 )
&& ( DynamicBrakeTest <= 3 )
&& ( routeaccdesired < AccDesired ) ) {
AccDesired = routeaccdesired;
fAccDesiredGravity = routeaccdesiredgravity;
VelDesired = std::min( VelDesired, routeveldesired );
}
}
void