331 lines
8 KiB
XML
331 lines
8 KiB
XML
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<?xml version="1.0" encoding="UTF-8" ?>
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<!-- Airbus A320 autobrake configuration -->
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<!-- Adapated from the Boeing 777-200ER -->
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<PropertyList>
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<logic>
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<name>Disabled state</name>
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<!-- ensure output is consistent when no mode is selected-->
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<enable>
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<condition>
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<equals>
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<property>/autopilot/autobrake/step</property>
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<value>0</value>
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</equals>
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</condition>
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</enable>
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<input><false/></input>
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<output>/autopilot/autobrake/engaged</output>
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</logic>
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<logic>
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<name>Max (RTO in Boeing terms) selected</name>
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<input>
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<equals>
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<property>/autopilot/autobrake/step</property>
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<value>3</value>
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</equals>
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</input>
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<output>/autopilot/autobrake/max-selected</output>
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</logic>
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<logic>
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<name>Autobrake Selected</name>
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<input>
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<greater-than>
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<property>/autopilot/autobrake/step</property>
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<value>0</value>
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</greater-than>
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</input>
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<output>/autopilot/autobrake/selected</output>
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</logic>
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<logic>
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<name>Throttles At Idle</name>
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<input>
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<!-- engine 0 -->
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<and>
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<or>
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<less-than>
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<property>/controls/engines/engine[0]/throttle</property>
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<property>/autopilot/autobrake/config/idle-throttle</property>
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</less-than>
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<property>/controls/engines/engine[0]/reverser</property>
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</or>
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<!-- engine 1 -->
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<or>
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<less-than>
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<property>/controls/engines/engine[1]/throttle</property>
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<property>/autopilot/autobrake/config/idle-throttle</property>
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</less-than>
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<property>/controls/engines/engine[1]/reverser</property>
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</or>
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</and>
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</input>
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<output>/autopilot/autobrake/throttles-at-idle</output>
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</logic>
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<logic>
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<name>Airborne</name>
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<input>
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<not><property>/gear/gear/wow</property></not>
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</input>
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<output>/autopilot/autobrake/airborne</output>
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</logic>
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<logic>
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<name>High-speed</name>
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<input>
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<greater-than>
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<property>/instrumentation/airspeed-indicator/indicated-speed-kt</property>
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<value>40</value>
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</greater-than>
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</input>
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<output>/autopilot/autobrake/above-40-kts</output>
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</logic>
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<logic>
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<name>Spoilers deployed</name>
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<input>
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<greater-than>
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<property>/surface-positions/speedbrake-pos-norm</property>
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<value>0</value>
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</greater-than>
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</input>
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<output>/autopilot/autobrake/spoilers-deployed</output>
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</logic>
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<!-- pilot brake input -->
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<logic>
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<name>Pilot Input</name>
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<input>
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<less-than>
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<property>/autopilot/autobrake/config/pilot-input</property>
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<expression>
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<max>
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<property>/controls/gear/brake-left</property>
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<property>/controls/gear/brake-right</property>
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</max>
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</expression>
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</less-than>
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</input>
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<output>/autopilot/autobrake/pilot-input</output>
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</logic>
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<flipflop>
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<name>Autobrake Engage logic</name>
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<debug>false</debug>
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<type>RS</type>
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<enable>
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<condition>
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<and>
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<property>/autopilot/autobrake/selected</property>
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<not>
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<property>/autopilot/autobrake/max-selected</property>
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</not>
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</and>
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</condition>
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</enable>
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<S>
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<and>
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<property>/autopilot/autobrake/throttles-at-idle</property>
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<property>/autopilot/autobrake/spoilers-deployed</property>
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<not>
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<property>/autopilot/autobrake/airborne</property>
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</not>
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</and>
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</S>
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<R>
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<false/>
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</R>
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<output>/autopilot/autobrake/engaged</output>
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</flipflop>
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<filter>
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<name>MAX cancel logic</name>
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<type>gain</type>
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<gain>1.0</gain>
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<debug>false</debug>
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<enable>
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<condition>
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<property>/autopilot/autobrake/max-selected</property>
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<property>/autopilot/autobrake/airborne</property>
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</condition>
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</enable>
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<input><value>0</value></input> <!-- switch to 'off' -->
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<output>/autopilot/autobrake/step</output>
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</filter>
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<flipflop>
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<name>MAX engage logic</name>
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<type>RS</type>
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<debug>false</debug>
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<enable>
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<condition>
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<property>/autopilot/autobrake/max-selected</property>
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<property>/autopilot/autobrake/above-40-kts</property>
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</condition>
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</enable>
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<S>
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<and>
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<property>/autopilot/autobrake/throttles-at-idle</property>
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<property>/autopilot/autobrake/spoilers-deployed</property>
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</and>
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</S>
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<R>
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<false/>
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</R>
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<output>/autopilot/autobrake/engaged</output>
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</flipflop>
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<filter>
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<name>Disengage logic</name>
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<debug>false</debug>
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<type>gain</type>
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<gain>1.0</gain>
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<enable>
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<condition>
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<property>/autopilot/autobrake/engaged</property>
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<or>
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<!-- disengage on pilot input -->
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<property>/autopilot/autobrake/pilot-input</property>
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<!-- disengage if the throttles are not at idle -->
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<not><property>/autopilot/autobrake/throttles-at-idle</property></not>
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<!-- disengage if the spoilers are retracted -->
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<not><property>/autopilot/autobrake/spoilers-deployed</property></not>
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</or>
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</condition>
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</enable>
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<input><value>0</value></input> <!-- switch to 'off' -->
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<output>/autopilot/autobrake/step</output>
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</filter>
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<!-- model the accelerometer portion of the AB system.
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This could differentiate indicated-airspeed, but I suspect real-
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world systems use accelerometers directly. -->
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<filter>
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<name>Deceleration Sensor</name>
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<type>noise-spike</type>
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<max-rate-of-change>5.0</max-rate-of-change>
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<input>
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<scale>-1</scale> <!-- deceleration, not acceleration -->
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<property>/fdm/jsbsim/accelerations/udot-ft_sec2</property>
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</input>
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<output>/autopilot/autobrake/actual-decel-ftsec2</output>
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</filter>
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<!-- translate dial setting levels into target decelerations, based upon
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information in the POH -->
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<filter>
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<name>Target Deceleration Table</name>
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<type>gain</type>
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<debug>false</debug>
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<gain>1.0</gain>
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<output>/autopilot/autobrake/target-decel-ftsec2</output>
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<input>
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<condition>
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<not>
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<property>/autopilot/autobrake/max-selected</property>
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</not>
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</condition>
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<expression>
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<!-- values taken from http://www.pprune.org/tech-log/304333-a320-autoland-distance-autobrake-vs-manual-landing-distance-autobrake-2.html#post3809602 -->
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<table>
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<property>/autopilot/autobrake/step</property>
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<entry><ind>0</ind><dep>0</dep></entry>
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<entry><ind>1</ind><dep>5.6</dep></entry>
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<entry><ind>2</ind><dep>9.8</dep></entry>
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</table>
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</expression>
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</input>
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<input>
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<condition>
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<property>/autopilot/autobrake/max-selected</property>
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</condition>
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<!-- RTO setting applies max hydraulic pressure, simulate this
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with a huge value here, to ensure the PI drives to 1.0 output -->
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<value>50</value>
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</input>
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</filter>
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<pi-simple-controller>
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<name>Brake Effort Computer</name>
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<debug>false</debug>
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<enable>
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<property>/autopilot/autobrake/engaged</property>
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</enable>
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<input><property>/autopilot/autobrake/actual-decel-ftsec2</property></input>
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<reference>/autopilot/autobrake/target-decel-ftsec2</reference>
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<output>/autopilot/autobrake/output-brake</output>
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<min>0.0</min>
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<max>1.0</max>
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<config>
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<Kp>1.0</Kp>
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<Ki>0.0</Ki>
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</config>
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</pi-simple-controller>
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<!-- left output summer -->
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<filter>
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<name>Left Output Summer</name>
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<type>gain</type>
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<gain>1.0</gain>
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<input>
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<condition>
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<property>/autopilot/autobrake/engaged</property>
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</condition>
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<expression>
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<max>
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<property>/controls/gear/brake-left</property>
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<property>/autopilot/autobrake/output-brake</property>
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</max>
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</expression>
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</input>
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<!-- default input -->
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<input>
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<property>/controls/gear/brake-left</property>
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</input>
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<output>/autopilot/autobrake/brake-left-output</output>
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</filter>
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<!-- right output summer -->
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<filter>
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<name>Right Output Summer</name>
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<type>gain</type>
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<gain>1.0</gain>
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<input>
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<condition>
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<property>/autopilot/autobrake/engaged</property>
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</condition>
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<expression>
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<max>
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<property>/controls/gear/brake-right</property>
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<property>/autopilot/autobrake/output-brake</property>
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</max>
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</expression>
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</input>
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<!-- default input -->
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<input>
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<property>/controls/gear/brake-right</property>
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</input>
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<output>/autopilot/autobrake/brake-right-output</output>
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</filter>
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</PropertyList>
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