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Intro
Automated Train Control (ATC) is composed of Automated Train Protection (ATP), Automated Train Operation (ATO) and Automated Train Supervision (ATS).
In the event of conflict ATP shall take precedence over ATO and ATS.
In the event of conflict ATO shall take precedence over ATS.
5.1 ATP
5.1.1 Presence Detection
All trains and any other vehicles that operate on the system in the presence of trains running in automated operation shall be detected, regardless of whether they are being operated in automatic or manual control.
Identification shall be done by positive detection (i.e. absence of train does not imply that train is elsewhere)
5.1.2 Separation Assurance
5.1.3 Unintentional Motion Detection
5.1.4 Overspeed Protection
Shall provide speed enforcement, ensuring that the speed of a train never exceeds the defined speed limit anywhere along the entire route.
Speed is measured by measuring the actual speed (therefore not the derived speed).
If speed were to exceed the speed limit then emergency braking shall be applied.
5.1.5 Overtravel Protection
5.1.6 Parted Consist Protection
5.1.7 Lost Signal Protection
* Shall be continuous or be of such a repetitive nature that signal interruption is detected. Detection of signal interuption shall result in emergency braking by ATP in sufficient time so as not to compromise any safety aspect of the ATP functional design.
5.1.8 Zero Speed Detection
* Zero speed shall not be registered until a speed of 0.3 m/s or less is attached and braking is commanded.
5.1.9 Unscheduled Door Opening Protection
If any automatic door or emergency exit door on a train unlocks for any reason while the train is in motion (i.e. not zero speed) that train shall be caused to brake to a full stop.
If any automatic station door is unlocked for any reason trains shall be prohibited from entering or leaving that station platform.
5.1.10 Door Control Protection Interlocks
5.1.11 Departure Interlocks
5.1.12 Direction Reversal Interlocks
Travel direction reversal interlocks shall be provided by ATO on trains requiring bidirectional operation on any segment of the automated guideway.
Any reversal of train travel direction shall occur only after zero speed has been registered.
5.1.13 Propulsion and Braking Interlocks
Emergency braking shall be irrevocable.
After initiating emergency braking it shall require to be manually reset in order for normal operations to resume.
Emergency braking shall be interlocked with the propulsion control such that braking commands dominate.
5.1.14 Guideway Switch Interlocks
5.2 Automatic Train Operation
5.2.1 Motion Control
Starting, Stopping and regulation of the train speed shall be controlled by ATO.
Shall be governed by acceleration, de-acceleration and jerk rate limits.
5.2.2 Programmed Station Stop