f44db83b25
From https://github.com/Juanvvc/c172p-detailed/ release/2016.1 commit 3f33b88bb015a8ee685ab3178932d16d6e072410 A big Thank-You to the c172p-detailed team for their ongoing work.
268 lines
9.7 KiB
Text
268 lines
9.7 KiB
Text
# Manages the engine
|
|
#
|
|
# Fuel system: based on the Spitfire. Manages primer and negGCutoff
|
|
# Hobbs meter
|
|
|
|
# =============================== DEFINITIONS ===========================================
|
|
|
|
# set the update period
|
|
|
|
var UPDATE_PERIOD = 0.3;
|
|
|
|
# =============================== Hobbs meter =======================================
|
|
|
|
# this property is saved by aircraft.timer
|
|
var hobbsmeter_engine_160hp = aircraft.timer.new("/sim/time/hobbs/engine[0]", 60, 1);
|
|
var hobbsmeter_engine_180hp = aircraft.timer.new("/sim/time/hobbs/engine[1]", 60, 1);
|
|
|
|
var init_hobbs_meter = func(index, meter) {
|
|
setlistener("/engines/engine[" ~ index ~ "]/running", func {
|
|
if (getprop("/engines/engine[" ~ index ~ "]/running")) {
|
|
meter.start();
|
|
print("Hobbs system started");
|
|
} else {
|
|
meter.stop();
|
|
print("Hobbs system stopped");
|
|
}
|
|
}, 1, 0);
|
|
};
|
|
|
|
init_hobbs_meter(0, hobbsmeter_engine_160hp);
|
|
init_hobbs_meter(1, hobbsmeter_engine_180hp);
|
|
|
|
var update_hobbs_meter = func {
|
|
# in seconds
|
|
var hobbs_160hp = getprop("/sim/time/hobbs/engine[0]") or 0.0;
|
|
var hobbs_180hp = getprop("/sim/time/hobbs/engine[1]") or 0.0;
|
|
# This uses minutes, for testing
|
|
#hobbs = hobbs / 60.0;
|
|
# in hours
|
|
hobbs = (hobbs_160hp + hobbs_180hp) / 3600.0;
|
|
# tenths of hour
|
|
setprop("/instrumentation/hobbs-meter/digits0", math.mod(int(hobbs * 10), 10));
|
|
# rest of digits
|
|
setprop("/instrumentation/hobbs-meter/digits1", math.mod(int(hobbs), 10));
|
|
setprop("/instrumentation/hobbs-meter/digits2", math.mod(int(hobbs / 10), 10));
|
|
setprop("/instrumentation/hobbs-meter/digits3", math.mod(int(hobbs / 100), 10));
|
|
setprop("/instrumentation/hobbs-meter/digits4", math.mod(int(hobbs / 1000), 10));
|
|
};
|
|
|
|
setlistener("/sim/time/hobbs/engine[0]", update_hobbs_meter, 1, 0);
|
|
setlistener("/sim/time/hobbs/engine[1]", update_hobbs_meter, 1, 0);
|
|
|
|
# ========== primer stuff ======================
|
|
|
|
# Toggles the state of the primer
|
|
var pumpPrimer = func {
|
|
var push = getprop("/controls/engines/engine/primer-lever") or 0;
|
|
|
|
if (push) {
|
|
var pump = getprop("/controls/engines/engine/primer") or 0;
|
|
setprop("/controls/engines/engine/primer", pump + 1);
|
|
setprop("/controls/engines/engine/primer-lever", 0);
|
|
}
|
|
else {
|
|
setprop("/controls/engines/engine/primer-lever", 1);
|
|
}
|
|
};
|
|
|
|
# Primes the engine automatically. This function takes several seconds
|
|
var autoPrime = func {
|
|
var p = getprop("/controls/engines/engine/primer") or 0;
|
|
if (p < 3) {
|
|
pumpPrimer();
|
|
settimer(autoPrime, 1);
|
|
}
|
|
};
|
|
|
|
# Mixture will be calculated using the primer during 5 seconds AFTER the pilot used the starter
|
|
# This prevents the engine to start just after releasing the starter: the propeller will be running
|
|
# thanks to the electric starter, but carburator has not yet enough mixture
|
|
var primerTimer = maketimer(5, func {
|
|
setprop("/controls/engines/engine/use-primer", 0);
|
|
# Reset the number of times the pilot used the primer only AFTER using the starter
|
|
setprop("/controls/engines/engine/primer", 0);
|
|
print("Primer reset to 0");
|
|
primerTimer.stop();
|
|
});
|
|
|
|
# ========== oil consumption ======================
|
|
|
|
var oil_consumption = maketimer(1.0, func {
|
|
if (getprop("/engines/active-engine/oil_consumption_allowed"))
|
|
var oil_level = getprop("/engines/active-engine/oil-level");
|
|
else
|
|
var oil_level = 7.0;
|
|
var rpm = getprop("/engines/active-engine/rpm");
|
|
|
|
# Quadratic formula which outputs 1.0 for input 2300 RPM (cruise value),
|
|
# 0.6 for 700 RPM (idle) and 1.2 for 2700 RPM (max)
|
|
var rpm_factor = 0.00000012 * math.pow(rpm, 2) - 0.0001 * rpm + 0.62;
|
|
|
|
# Consumption rate defined as 1.5 quarter per 10 hours (36000 seconds)
|
|
# at cruise RPM
|
|
var consumption_rate = 1.5 / 36000;
|
|
|
|
var low_oil_pressure_factor = 1.0;
|
|
var low_oil_temperature_factor = 1.0;
|
|
|
|
if (getprop("/engines/active-engine/running")) {
|
|
oil_level = oil_level - consumption_rate * rpm_factor;
|
|
setprop("/engines/active-engine/oil-level", oil_level);
|
|
}
|
|
|
|
# If oil gets low (< 5.0), pressure should drop and temperature should rise
|
|
var oil_level_limited = std.min(oil_level, 5.0);
|
|
|
|
# Should give 1.0 for oil_level = 5 and 0.1 for oil_level 4.92,
|
|
# which is the min before the engine stops
|
|
low_oil_pressure_factor = 11.25 * oil_level_limited - 55.25;
|
|
|
|
# Should give 1.0 for oil_level = 5 and 1.5 for oil_level 4.92
|
|
low_oil_temperature_factor = -6.25 * oil_level_limited + 32.25;
|
|
|
|
setprop("/engines/active-engine/low-oil-pressure-factor", low_oil_pressure_factor);
|
|
setprop("/engines/active-engine/low-oil-temperature-factor", low_oil_temperature_factor);
|
|
|
|
});
|
|
|
|
# ========== engine coughing ======================
|
|
|
|
var engine_coughing = maketimer(3.0, func {
|
|
var coughing = getprop("/engines/active-engine/coughing");
|
|
var running = getprop("/engines/active-engine/running");
|
|
if (coughing and running) {
|
|
var delay = 10.0 * rand();
|
|
settimer(func {
|
|
setprop("/engines/active-engine/kill-engine", 1);
|
|
|
|
# Bring the engine back to life after 0.25 seconds
|
|
settimer(func {
|
|
setprop("/engines/active-engine/kill-engine", 0);
|
|
}, 0.25);
|
|
}, delay);
|
|
};
|
|
});
|
|
|
|
# ========== Main loop ======================
|
|
|
|
var update = func {
|
|
var leftTankUsable = getprop("/consumables/fuel/tank[0]/selected") and getprop("/consumables/fuel/tank[0]/level-gal_us") > 0;
|
|
var rightTankUsable = getprop("/consumables/fuel/tank[1]/selected") and getprop("/consumables/fuel/tank[1]/level-gal_us") > 0;
|
|
var outOfFuel = !(leftTankUsable or rightTankUsable);
|
|
|
|
# We use the mixture to control the engines, so set the mixture
|
|
var usePrimer = getprop("/controls/engines/engine/use-primer") or 0;
|
|
|
|
var engine_running = getprop("/engines/active-engine/running");
|
|
|
|
if (outOfFuel and (engine_running or usePrimer)) {
|
|
print("Out of fuel!");
|
|
gui.popupTip("Out of fuel!");
|
|
}
|
|
elsif (usePrimer and !engine_running and getprop("/engines/active-engine/oil-temperature-degf") <= 75) {
|
|
# Mixture is controlled by start conditions
|
|
var primer = getprop("/controls/engines/engine/primer");
|
|
if (!getprop("/fdm/jsbsim/fcs/mixture-primer") and getprop("/controls/switches/starter")) {
|
|
if (primer < 3) {
|
|
print("Use the primer!");
|
|
gui.popupTip("Use the primer!");
|
|
}
|
|
elsif (primer > 6) {
|
|
print("Flooded engine!");
|
|
gui.popupTip("Flooded engine!");
|
|
}
|
|
else {
|
|
print("Check the throttle!");
|
|
gui.popupTip("Check the throttle!");
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
setlistener("/controls/switches/starter", func {
|
|
if (!getprop("/fdm/jsbsim/complex"))
|
|
c172p.autostart(0);
|
|
var v = getprop("/controls/switches/starter") or 0;
|
|
if (v == 0) {
|
|
print("Starter off");
|
|
# notice the starter will be reset after 5 seconds
|
|
primerTimer.restart(5);
|
|
}
|
|
else {
|
|
print("Starter on");
|
|
setprop("/controls/engines/engine/use-primer", 1);
|
|
if (primerTimer.isRunning) {
|
|
primerTimer.stop();
|
|
}
|
|
}
|
|
}, 1, 0);
|
|
|
|
# ================================ Initalize ======================================
|
|
# Make sure all needed properties are present and accounted
|
|
# for, and that they have sane default values.
|
|
|
|
# =============== Variables ================
|
|
|
|
controls.incThrottle = func {
|
|
var delta = arg[1] * controls.THROTTLE_RATE * getprop("/sim/time/delta-realtime-sec");
|
|
var old_value = getprop("/controls/engines/current-engine/throttle");
|
|
var new_value = std.max(0.0, std.min(old_value + delta, 1.0));
|
|
setprop("/controls/engines/current-engine/throttle", new_value);
|
|
};
|
|
|
|
controls.throttleMouse = func {
|
|
if (!getprop("/devices/status/mice/mouse[0]/button[1]")) {
|
|
return;
|
|
}
|
|
var delta = cmdarg().getNode("offset").getValue() * -4;
|
|
var old_value = getprop("/controls/engines/current-engine/throttle");
|
|
var new_value = std.max(0.0, std.min(old_value + delta, 1.0));
|
|
setprop("/controls/engines/current-engine/throttle", new_value);
|
|
};
|
|
|
|
controls.throttleAxis = func {
|
|
var value = (1 - cmdarg().getNode("setting").getValue()) / 2;
|
|
var new_value = std.max(0.0, std.min(value, 1.0));
|
|
setprop("/controls/engines/current-engine/throttle", new_value);
|
|
};
|
|
|
|
controls.adjMixture = func {
|
|
var delta = arg[0] * controls.THROTTLE_RATE * getprop("/sim/time/delta-realtime-sec");
|
|
var old_value = getprop("/controls/engines/current-engine/mixture");
|
|
var new_value = std.max(0.0, std.min(old_value + delta, 1.0));
|
|
setprop("/controls/engines/current-engine/mixture", new_value);
|
|
};
|
|
|
|
controls.mixtureAxis = func {
|
|
var value = (1 - cmdarg().getNode("setting").getValue()) / 2;
|
|
var new_value = std.max(0.0, std.min(value, 1.0));
|
|
setprop("/controls/engines/current-engine/mixture", new_value);
|
|
};
|
|
|
|
controls.stepMagnetos = func {
|
|
var old_value = getprop("/controls/switches/magnetos");
|
|
var new_value = std.max(0, std.min(old_value + arg[0], 3));
|
|
setprop("/controls/switches/magnetos", new_value);
|
|
};
|
|
|
|
# key 's' calls to this function when it is pressed DOWN even if I overwrite the binding in the -set.xml file!
|
|
# fun fact: the key UP event can be overwriten!
|
|
controls.startEngine = func(v = 1) {
|
|
if (getprop("/engines/active-engine/running"))
|
|
{
|
|
setprop("/controls/switches/starter", 0);
|
|
return;
|
|
}
|
|
else {
|
|
setprop("/controls/switches/magnetos", 3);
|
|
setprop("/controls/switches/starter", v);
|
|
}
|
|
};
|
|
|
|
setlistener("/sim/signals/fdm-initialized", func {
|
|
var engine_timer = maketimer(UPDATE_PERIOD, func { update(); });
|
|
engine_timer.start();
|
|
oil_consumption.start();
|
|
engine_coughing.start();
|
|
});
|