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fgdata/Aircraft/Generic/century3.nas

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##
# Century III Autopilot System
# Tries to behave like the Century III autopilot
# two axis
#
# One would also need the autopilot configuration file
# CENTURYIII.xml and the panel instrument configuration file
#
# Written by Dave Perry to match functionality described in
#
# CENTURY III
# AUTOPILOT FLIGHT SYSTEM
# PILOT'S OPERATING HANDBOOK
# NOVEMBER 1998 68S25
#
# Draws heavily from the kap140 system written by Roy Vegard Ovesen
##
# Properties
var locks = "/autopilot/CENTURYIII/locks";
var settings = "/autopilot/CENTURYIII/settings";
var internal = "/autopilot/internal";
var flightControls = "/controls/flight";
var autopilotControls = "/autopilot/CENTURYIII/controls";
# locks
var propLocks = props.globals.getNode(locks, 1);
var lockAltHold = propLocks.getNode("alt-hold", 1);
var lockPitchHold = propLocks.getNode("pitch-hold", 1);
var lockAprHold = propLocks.getNode("apr-hold", 1);
var lockGsHold = propLocks.getNode("gs-hold", 1);
var lockHdgHold = propLocks.getNode("hdg-hold", 1);
var lockNavHold = propLocks.getNode("nav-hold", 1);
var lockOmniHold = propLocks.getNode("omni-hold", 1);
var lockRevHold = propLocks.getNode("rev-hold", 1);
var lockRollAxis = propLocks.getNode("roll-axis", 1);
var lockRollMode = propLocks.getNode("roll-mode", 1);
var lockPitchAxis = propLocks.getNode("pitch-axis", 1);
var lockPitchMode = propLocks.getNode("pitch-mode", 1);
var lockRollArm = propLocks.getNode("roll-arm", 1);
var lockPitchArm = propLocks.getNode("pitch-arm", 1);
var rollModes = { "OFF" : 0, "ROL" : 1, "HDG" : 2, "OMNI" : 3, "NAV" : 4, "REV" : 5, "APR" : 6 };
var pitchModes = { "OFF" : 0, "VS" : 1, "ALT" : 2, "GS" : 3, "AOA" : 4 };
var rollArmModes = { "OFF" : 0, "NAV" : 1, "OMNI" : 2, "APR" : 3, "REV" : 4 };
var pitchArmModes = { "OFF" : 0, "ALT" : 1, "GS" : 2 };
# settings
var propSettings = props.globals.getNode(settings, 1);
var settingTargetAltPressure = propSettings.getNode("target-alt-pressure", 1);
var settingTargetInterceptAngle = propSettings.getNode("target-intercept-angle", 1);
var settingTargetPressureRate = propSettings.getNode("target-pressure-rate", 1);
var settingTargetRollDeg = propSettings.getNode("target-roll-deg", 1);
var settingRollKnobDeg = propSettings.getNode("roll-knob-deg", 1);
var settingTargetPitchDeg = propSettings.getNode("target-pitch-deg", 1);
var settingPitchWheelDeg = propSettings.getNode("pitch-wheel-deg", 1);
var settingAutoPitchTrim = propSettings.getNode("auto-pitch-trim", 1);
var settingGScaptured = propSettings.getNode("gs-captured", 1);
var settingDeltaPitch = propSettings.getNode("delta-pitch", 1);
#Flight controls
var propFlightControls = props.globals.getNode(flightControls, 1);
var elevatorControl = propFlightControls.getNode("elevator", 1);
var elevatorTrimControl = propFlightControls.getNode("elevator-trim", 1);
#Autopilot controls
var propAutopilotControls = props.globals.getNode(autopilotControls, 1);
var rollControl = propAutopilotControls.getNode("roll", 1);
# values 0 (ROLL switch off) 1 (ROLL switch on)
var hdgControl = propAutopilotControls.getNode("hdg", 1);
# values 0 (HDG switch off) 1 (HDG switch on)
var modeControl = propAutopilotControls.getNode("mode", 1);
var altControl = propAutopilotControls.getNode("alt", 1);
# values 0 (ALT switch off) 1 (ALT switch on)
var pitchControl = propAutopilotControls.getNode("pitch", 1);
# values 0 (PITCH switch off) 1 (PITCH switch on)
var headingNeedleDeflection = "/instrumentation/nav/heading-needle-deflection";
var gsNeedleDeflection = "/instrumentation/nav/gs-needle-deflection-deg";
var indicatedPitchDeg = "/instrumentation/attitude-indicator/indicated-pitch-deg";
var staticPressure = "/systems/static/pressure-inhg";
var altitudePressure = "/autopilot/CENTURYIII/settings/target-alt-pressure";
var power="/systems/electrical/outputs/autopilot";
var enableAutoTrim = "/sim/model/enable-auto-trim";
var filteredHeadingNeedleDeflection = "/autopilot/internal/filtered-heading-needle-deflection";
var pressureUnits = { "inHg" : 0, "hPa" : 1 };
var altPressure = 0.0;
var gsTimeCheck = 0.0;
var valueTest = 0;
var lastValue = 0;
var newValue = 0;
var minVoltageLimit = 8.0;
var newMode = 2;
var oldMode = 2;
var deviation = 0;
rollControl.setDoubleValue(0.0);
hdgControl.setDoubleValue(0.0);
altControl.setDoubleValue(0.0);
pitchControl.setDoubleValue(0.0);
modeControl.setDoubleValue(2.0);
settingTargetPitchDeg.setDoubleValue(0.0);
settingPitchWheelDeg.setDoubleValue(0.0);
settingDeltaPitch.setDoubleValue(0.0);
settingTargetPressureRate.setDoubleValue(0.0);
settingGScaptured.setDoubleValue(0.0);
# If you need to be able to enable/disable auto trim, make is a menu toggle.
# Auto trim enabled by default
setprop(enableAutoTrim, 1);
var autoPitchTrim = 0.0;
var apInit = func {
##print("ap init");
##
# Initialises the autopilot.
##
lockAltHold.setBoolValue(0);
lockAprHold.setBoolValue(0);
lockGsHold.setBoolValue(0);
lockHdgHold.setBoolValue(0);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockRollAxis.setBoolValue(0);
lockRollMode.setIntValue(rollModes["OFF"]);
lockPitchAxis.setBoolValue(0);
lockPitchHold.setBoolValue(0);
lockPitchMode.setIntValue(pitchModes["OFF"]);
lockRollArm.setIntValue(rollArmModes["OFF"]);
lockPitchArm.setIntValue(pitchArmModes["OFF"]);
# Reset the memory for power down or power up
settingTargetAltPressure.setDoubleValue(0.0);
settingTargetPitchDeg.setDoubleValue(0.0);
settingTargetPressureRate.setDoubleValue(0.0);
settingTargetInterceptAngle.setDoubleValue(0.0);
settingTargetRollDeg.setDoubleValue(0.0);
settingAutoPitchTrim.setDoubleValue(0.0);
settingGScaptured.setDoubleValue(0.0);
settingRollKnobDeg.setDoubleValue(0.0);
}
var apPower = func {
## Monitor autopilot power
## Call apInit if the power is too low
if (getprop(power) < minVoltageLimit) {
newValue = 0;
} else {
newValue = 1;
}
valueTest = newValue - lastValue;
# print("v_test = ", v_test);
if (valueTest > 0.5) {
# autopilot just powered up
print("power up");
apInit();
} elsif (valueTest < -0.5) {
# autopilot just lost power
print("power lost");
apInit();
# note: all button and knobs disabled in functions below
}
lastValue = newValue;
# Update difference between pitch wheel target and indicated pitch.
# Used to animate the Pitch Trim meter to the left of pitch wheel
if (rollControl.getValue() ) {
settingDeltaPitch.setDoubleValue(settingPitchWheelDeg.getValue()
- getprop(indicatedPitchDeg));
} else {
settingDeltaPitch.setDoubleValue(0.0);
}
var inrange0 = getprop("/instrumentation/nav[0]/in-range");
# Shut off autopilot if HDG switch on and mode != 2 when NAV flag is on
if ( !inrange0 ) {
if ( hdgControl.getValue() and (modeControl.getValue() != 2)) {
rollControl.setDoubleValue(0.0);
apRollControl();
}
}
settimer(apPower, 0.5);
}
var apRollControl = func {
if (rollControl.getValue() ) {
rollButton(1);
} else {
# A/P on/off switch was turned off, so turn off other AP switches
hdgControl.setDoubleValue(0.0); #hdgButton(0);
altControl.setDoubleValue(0.0); #altButton(0);
pitchControl.setDoubleValue(0.0); #pitchButton(0);
# rollButton(0);
apInit();
}
}
var apHdgControl = func {
if (hdgControl.getValue() ) {
# hdg switch turned on sets roll
rollControl.setDoubleValue(1.0);
rollButton(1);
##
# hdg switch is on so check which roll mode is set
##
apModeControlsSet();
} else {
# hdg switch turned off resets alt and pitch
hdgControl.setDoubleValue(0.0); hdgButton(0);
altControl.setDoubleValue(0.0); altButton(0);
pitchControl.setDoubleValue(0.0); pitchButton(0);
}
}
var apAltControl = func {
if ( altControl.getValue() ){
# Alt switch on so set ROLL, HDG, and PITCH
rollControl.setDoubleValue(1.0);
rollButton(1);
hdgControl.setDoubleValue(1.0);
# roll and hdg switches on so check which roll mode is set
apModeControlsSet();
pitchControl.setDoubleValue(1.0);
pitchButton(1);
altButton(1);
} else {
altButton(0);
}
}
var apPitchControl = func {
if ( pitchControl.getValue() ) {
# Pitch switch on so set ROLL and HDG
rollControl.setDoubleValue(1.0);
rollButton(1);
hdgControl.setDoubleValue(1.0);
# roll and hdg switches on so check which roll mode is set
apModeControlsSet();
pitchButton(1);
} else {
altControl.setDoubleValue(0.0);
altButton(0);
pitchButton(0);
}
}
var rollKnobUpdate = func {
if ( rollControl.getValue() and !hdgControl.getValue() ) {
settingTargetRollDeg.setDoubleValue( settingRollKnobDeg.getValue() );
}
}
var pitchWheelUpdate = func {
if ( rollControl.getValue() and !altControl.getValue() ) {
settingTargetPitchDeg.setDoubleValue( settingPitchWheelDeg.getValue() );
}
}
var apModeControlsChange = func {
##
# Delay mode change to allow time for multi-mode rotation
##
settimer(apModeControlsSet, 2);
}
var apModeControlsSet = func {
newMode = modeControl.getValue();
##
# Decouple GS if the mode selector is switched from LOC NORM
##
if (oldMode == rollModes["APR"] and newMode != rollModes["APR"])
{
if (lockPitchMode.getValue() == pitchModes["GS"])
{
lockPitchMode.setIntValue(pitchModes["OFF"]);
}
if (lockPitchArmModes.getValue() == pitchArmModes["GS"])
{
lockPitchArmMode.setIntValue(pitchModes["OFF"]);
}
lockGsHold.setBoolValue(0);
settingGScoupled.setDoubleValue(0.0);
}
oldMode = newMode;
#All modes entered from hdg mode
if ( hdgControl.getValue() ) {
hdgButton(1);
if (newMode == 0 ){
navButton();
} elsif (newMode == 1 ) {
omniButton();
} elsif (newMode == 3 ) {
aprButton();
} elsif(newMode == 4 ) {
revButton();
}
} else {
return;
}
}
var rollButton = func(switch_on) {
##print("rollButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
if ( switch_on ) {
##
# Engage the autopilot in Wings level mode (ROL) and set the turn rate
# from the "ROLL Knob".
##
lockAprHold.setBoolValue(0);
lockHdgHold.setBoolValue(0);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollMode.setIntValue(rollModes["ROL"]);
lockRollArm.setIntValue(rollArmModes["OFF"]);
} else {
lockAprHold.setBoolValue(0);
lockHdgHold.setBoolValue(0);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockRollAxis.setBoolValue(0);
lockRollMode.setIntValue(rollModes["OFF"]);
lockRollArm.setIntValue(rollArmModes["OFF"]);
}
}
var hdgButton = func(switch_on) {
##print("hdgButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
if (switch_on) {
##
# Engage the heading mode (HDG).
##
lockAprHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollMode.setIntValue(rollModes["HDG"]);
lockRollArm.setIntValue(rollArmModes["OFF"]);
settingTargetInterceptAngle.setDoubleValue(0.0);
} else {
lockHdgHold.setBoolValue(0);
rollKnobUpdate();
if ( rollControl.getValue() ) {
lockRollMode.setIntValue(rollModes["ROL"]);
} else {
lockRollMode.setIntValue(rollModes["OFF"]);
}
}
}
var navButton = func {
##print("navButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
##
# The Mode Selector and DG Course Selector should be set before switching the HDG
# rocker switch to "on". The DG Course Selector should be set to the OBS "to" or
# "from" bearing.
# Set up NAV mode and switch to the 45 degree angle intercept NAV mode
##
lockAprHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollArm.setIntValue(rollArmModes["NAV"]);
lockRollMode.setIntValue(rollModes["NAV"]);
navArmFromHdg();
}
var navArmFromHdg = func
{
##
# Abort the NAV-ARM mode if something has changed the arm mode to something
# else than NAV-ARM.
##
if (lockRollArm.getValue() != rollArmModes["NAV"])
{
return;
}
##
# Activate the nav-hold controller and check the needle deviation.
##
lockNavHold.setBoolValue(1);
deviation = getprop(headingNeedleDeflection);
##
# If the deflection is more than 9.95 degrees wait 5 seconds and check again.
##
if (abs(deviation) > 9.95)
{
#print("deviation");
settimer(navArmFromHdg, 5);
return;
}
##
# If the deviation is less than 10 degrees turn off the NAV-ARM. End of NAV-ARM sequence.
##
elsif (abs(deviation) < 10.0)
{
#print("capture");
lockRollArm.setIntValue(rollArmModes["OFF"]);
}
}
var omniButton = func {
##print("navButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
##
# The Mode Selector and DG Course Selector should be set before switching the HDG
# rocker switch to "on". The DG Course Selector should be set to the OBS "to" or
# "from" bearing.
# Set up OMNI mode and switch to the 45 degree angle intercept OMNI mode
##
lockAprHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollArm.setIntValue(rollArmModes["OMNI"]);
lockRollMode.setIntValue(rollModes["OMNI"]);
omniArmFromHdg();
}
var omniArmFromHdg = func
{
##
# Abort the OMNI-ARM mode if something has changed the arm mode to something
# else than OMNI-ARM.
##
if (lockRollArm.getValue() != rollArmModes["OMNI"])
{
return;
}
##
# Activate the omni-hold controller and check the needle deviation.
##
lockOmniHold.setBoolValue(1);
deviation = getprop(filteredHeadingNeedleDeflection);
##
# If the deflection is more than 9.95 degrees wait 5 seconds and check again.
##
if (abs(deviation) > 9.95)
{
#print("deviation");
settimer(omniArmFromHdg, 5);
return;
}
##
# If the deviation is less than 10 degrees turn off the OMNI-ARM. End of OMNI-ARM sequence.
##
elsif (abs(deviation) < 10.0)
{
#print("capture");
lockRollArm.setIntValue(rollArmModes["OFF"]);
}
}
var aprButton = func {
##print("aprButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
##
# The Mode Selector and DG Course Selector should be set before switching the HDG
# rocker switch to "on". Set the DG Course Selector to the LOC inbound heading.
# Set up APR mode and switch to the 45 degree angle intercept APR mode
##
lockAprHold.setBoolValue(1);
lockRevHold.setBoolValue(0);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollArm.setIntValue(rollArmModes["APR"]);
lockRollMode.setIntValue(rollModes["APR"]);
gsTimeCheck = -1;
aprArmFromHdg();
}
var aprArmFromHdg = func
{
##
# Abort the APR-ARM mode if something has changed the arm mode to something
# else than APR-ARM.
##
if (lockRollArm.getValue() != rollArmModes["APR"]
or !lockAltHold.getValue()
or getprop(gsNeedleDeflection) < 0.0)
{
return;
}
gsTimeCheck = gsTimeCheck + 1;
if (gsTimeCheck < 20)
{
settimer(aprArmFromHdg, 1.0);
}
##
# Activate the apr-hold controller and check the needle deviation.
##
lockAprHold.setBoolValue(1);
deviation = getprop(headingNeedleDeflection);
##
# If the deflection is more than 2.5 degrees wait 5 seconds and check again.
##
if (abs(deviation) > 2.495)
{
#print("deviation");
settimer(aprArmFromHdg, 5);
return;
}
##
# If the deviation is less than 2.5 degrees, start the GS-ARM sequence
##
elsif (abs(deviation) < 2.5)
{
lockPitchArm.setIntValue(pitchArmModes["GS"]);
gsArm();
}
}
var gsArm = func {
##
# Abort the GS-ARM mode if something has changed the arm mode to something
# else than GS-ARM.
##
if (lockPitchArm.getValue() != pitchArmModes["GS"])
{
return;
}
deviation = getprop(gsNeedleDeflection);
##
# If the deflection is more than 0.1 degrees wait 1 seconds and check again.
##
if (abs(deviation) > 0.1)
{
#print("deviation");
settimer(gsArm, 1);
return;
}
##
# If the deviation is less than 0.1 then activate the GS pitch mode.
##
elsif (abs(deviation) < 0.1)
{
#print("capture");
lockAltHold.setBoolValue(0);
lockGsHold.setBoolValue(1);
lockPitchMode.setIntValue(pitchModes["GS"]);
lockPitchArm.setIntValue(pitchArmModes["OFF"]);
settingGScaptured.setDoubleValue(1.0);
}
}
var revButton = func {
##print("revButton");
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
##
# The Mode Selector and DG Course Selector should be set before switching the HDG
# rocker switch to "on". Set the DG Course Selector to the LOC outbound
# (or reverse) heading.
# Set up REV mode and switch to the 45 degree angle intercept REV mode
##
lockAprHold.setBoolValue(0);
lockRevHold.setBoolValue(0);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollArm.setIntValue(rollArmModes["REV"]);
revArmFromHdg();
}
var revArmFromHdg = func
{
##
# Abort the REV-ARM mode if something has changed the arm mode to something
# else than REV-ARM.
##
if (lockRollArm.getValue() != rollArmModes["REV"])
{
return;
}
##
# Activate the rev-hold controller and check the needle deviation.
##
lockRevHold.setBoolValue(1);
deviation = getprop(headingNeedleDeflection);
##
# If the deflection is more than 2.5 degrees wait 5 seconds and check again.
##
if (abs(deviation) > 2.495)
{
#print("deviation");
settimer(revArmFromHdg, 5);
return;
}
##
# If the deviation is less than 2.5 - End of REV-ARM sequence.
##
elsif (abs(deviation) < 2.5)
{
#print("capture");
lockRollArm.setIntValue(rollArmModes["OFF"]);
lockAprHold.setBoolValue(0);
lockRevHold.setBoolValue(1);
lockHdgHold.setBoolValue(1);
lockNavHold.setBoolValue(0);
lockOmniHold.setBoolValue(0);
lockRollAxis.setBoolValue(1);
lockRollMode.setIntValue(rollModes["REV"]);
lockRollArm.setIntValue(rollArmModes["OFF"]);
}
}
var altButton = func(switch_on) {
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
if (switch_on) {
lockAltHold.setBoolValue(1);
lockPitchAxis.setBoolValue(1);
# lockPitchMode.setIntValue(pitchModes["ALT"]);
altPressure = getprop(staticPressure);
settingTargetAltPressure.setDoubleValue(altPressure);
# print("enableAutoTrim = ", getprop(enableAutoTrim));
if ( getprop(enableAutoTrim) ) {
settingAutoPitchTrim.setDoubleValue(1);
}
} else {
lockAltHold.setBoolValue(0);
lockPitchAxis.setBoolValue(0);
lockPitchMode.setIntValue(pitchModes["OFF"]);
lockPitchArm.setIntValue(pitchArmModes["OFF"]);
pitchWheelUpdate();
settingTargetPressureRate.setDoubleValue(0.0);
# alt switch is off so make sure the glide slope is disabled
settingGScaptured.setDoubleValue(0.0);
lockGsHold.setBoolValue(0);
}
}
var pitchButton = func(switch_on) {
# Disable button if too little power
if (getprop(power) < minVoltageLimit) { return; }
if (switch_on) {
lockPitchHold.setBoolValue(1);
# lockPitchAxis.setBoolValue(1);
# lockPitchMode.setIntValue(pitchModes["AOA"]);
# print("enableAutoTrim = ", getprop(enableAutoTrim));
if ( getprop(enableAutoTrim) ) {
settingAutoPitchTrim.setDoubleValue(1);
}
} else {
lockPitchHold.setBoolValue(0);
lockPitchAxis.setBoolValue(0);
lockPitchMode.setIntValue(pitchModes["OFF"]);
settingAutoPitchTrim.setDoubleValue(0);
}
}
var touchPower = func{
setprop(power,apVolts);
}
var apVolts = getprop(power);
if ( apVolts == nil or apVolts < minVoltageLimit ) {
# Wait for autopilot to be powered up
var L = setlistener(power, func {
apPower();
removelistener(L);
});
} else {
# Skip the setlistener since autopilot is already powered up
settimer(touchPower ,10);
apPower();
}