// $Id$
-#include <simgear/misc/exception.hxx>
+#include <simgear/structure/exception.hxx>
#include <simgear/misc/sg_path.hxx>
#include <Main/fg_props.hxx>
#include "electrical.hxx"
-ElectricalSystem::ElectricalSystem ()
+
+FGElectricalComponent::FGElectricalComponent() :
+ kind(-1),
+ name(""),
+ volts(0.0),
+ load_amps(0.0)
{
}
-ElectricalSystem::~ElectricalSystem ()
+
+FGElectricalSupplier::FGElectricalSupplier ( SGPropertyNode *node ) {
+ kind = FG_SUPPLIER;
+
+ // cout << "Creating a supplier" << endl;
+ name = node->getStringValue("name");
+ string _model = node->getStringValue("kind");
+ // cout << "_model = " << _model << endl;
+ if ( _model == "battery" ) {
+ model = FG_BATTERY;
+ } else if ( _model == "alternator" ) {
+ model = FG_ALTERNATOR;
+ } else if ( _model == "external" ) {
+ model = FG_EXTERNAL;
+ } else {
+ model = FG_UNKNOWN;
+ }
+ volts = node->getDoubleValue("volts");
+ amps = node->getDoubleValue("amps");
+ rpm_src = node->getStringValue("rpm-source");
+
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ // cout << " scanning: " << child->getName() << endl;
+ if ( !strcmp(child->getName(), "prop") ) {
+ string prop = child->getStringValue();
+ // cout << " Adding prop = " << prop << endl;
+ add_prop( prop );
+ fgSetDouble( prop.c_str(), amps );
+ }
+ }
+
+ _rpm_node = fgGetNode( rpm_src.c_str(), true);
+}
+
+
+double FGElectricalSupplier::get_output() {
+ if ( model == FG_BATTERY ) {
+ // cout << "battery amps = " << amps << endl;
+ return amps;
+ } else if ( model == FG_ALTERNATOR ) {
+ // scale alternator output for rpms < 600. For rpms >= 600
+ // give full output. This is just a WAG, and probably not how
+ // it really works but I'm keeping things "simple" to start.
+ double rpm = _rpm_node->getDoubleValue();
+ double factor = rpm / 600.0;
+ if ( factor > 1.0 ) {
+ factor = 1.0;
+ }
+ // cout << "alternator amps = " << amps * factor << endl;
+ return amps * factor;
+ } else if ( model == FG_EXTERNAL ) {
+ // cout << "external amps = " << 0.0 << endl;
+ return 0.0;
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT, "unknown supplier type" );
+ }
+
+ return 0.0;
+}
+
+
+FGElectricalBus::FGElectricalBus ( SGPropertyNode *node ) {
+ kind = FG_BUS;
+
+ name = node->getStringValue("name");
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ if ( !strcmp(child->getName(), "prop") ) {
+ string prop = child->getStringValue();
+ add_prop( prop );
+ }
+ }
+}
+
+
+FGElectricalOutput::FGElectricalOutput ( SGPropertyNode *node ) {
+ kind = FG_OUTPUT;
+ output_amps = 0.1; // arbitrary default value
+
+ name = node->getStringValue("name");
+ SGPropertyNode *draw = node->getNode("rated-draw");
+ if ( draw != NULL ) {
+ output_amps = draw->getDoubleValue();
+ }
+ // cout << "rated draw = " << output_amps << endl;
+
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ if ( !strcmp(child->getName(), "prop") ) {
+ string prop = child->getStringValue();
+ add_prop( prop );
+ }
+ }
+}
+
+
+FGElectricalSwitch::FGElectricalSwitch( SGPropertyNode *node ) :
+ switch_node( NULL ),
+ rating_amps( 0.0f ),
+ circuit_breaker( false )
{
+ bool initial_state = true;
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ string cname = child->getName();
+ string cval = child->getStringValue();
+ if ( cname == "prop" ) {
+ switch_node = fgGetNode( cval.c_str(), true );
+ // cout << "switch node = " << cval << endl;
+ } else if ( cname == "initial-state" ) {
+ if ( cval == "off" || cval == "false" ) {
+ initial_state = false;
+ }
+ // cout << "initial state = " << initial_state << endl;
+ } else if ( cname == "rating-amps" ) {
+ rating_amps = atof( cval.c_str() );
+ circuit_breaker = true;
+ // cout << "initial state = " << initial_state << endl;
+ }
+ }
+
+ switch_node->setBoolValue( initial_state );
+ // cout << " value = " << switch_node->getBoolValue() << endl;
}
-void
-ElectricalSystem::init ()
+
+FGElectricalConnector::FGElectricalConnector ( SGPropertyNode *node,
+ FGElectricalSystem *es ) {
+ kind = FG_CONNECTOR;
+ name = "connector";
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ string cname = child->getName();
+ string cval = child->getStringValue();
+ // cout << " " << cname << " = " << cval << endl;
+ if ( cname == "input" ) {
+ FGElectricalComponent *s = es->find( child->getStringValue() );
+ if ( s != NULL ) {
+ add_input( s );
+ if ( s->get_kind() == FG_SUPPLIER ) {
+ s->add_output( this );
+ } else if ( s->get_kind() == FG_BUS ) {
+ s->add_output( this );
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT,
+ "Attempt to connect to something that can't provide an output: "
+ << child->getStringValue() );
+ }
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT, "Can't find named source: "
+ << child->getStringValue() );
+ }
+ } else if ( cname == "output" ) {
+ FGElectricalComponent *s = es->find( child->getStringValue() );
+ if ( s != NULL ) {
+ add_output( s );
+ if ( s->get_kind() == FG_BUS ) {
+ s->add_input( this );
+ } else if ( s->get_kind() == FG_OUTPUT ) {
+ s->add_input( this );
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT,
+ "Attempt to connect to something that can't provide an input: "
+ << child->getStringValue() );
+ }
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT, "Can't find named source: "
+ << child->getStringValue() );
+ }
+ } else if ( cname == "switch" ) {
+ // cout << "Switch = " << child->getStringValue() << endl;
+ FGElectricalSwitch s( child );
+ add_switch( s );
+ }
+ }
+}
+
+
+// set all switches to the specified state
+void FGElectricalConnector::set_switches( bool state ) {
+ // cout << "setting switch state to " << state << endl;
+ for ( unsigned int i = 0; i < switches.size(); ++i ) {
+ switches[i].set_state( state );
+ }
+}
+
+
+// return true if all switches are true, false otherwise. A connector
+// could have multiple switches, but they all need to be true(closed)
+// for current to get through.
+bool FGElectricalConnector::get_state() {
+ unsigned int i;
+ for ( i = 0; i < switches.size(); ++i ) {
+ if ( ! switches[i].get_state() ) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
+FGElectricalSystem::FGElectricalSystem () :
+ enabled(false)
{
+}
+
+
+FGElectricalSystem::~FGElectricalSystem () {
+}
+
+
+void FGElectricalSystem::init () {
config_props = new SGPropertyNode;
- SGPath config( globals->get_fg_root() );
- config.append( fgGetString("/systems/electrical/path") );
+ SGPropertyNode *path_n = fgGetNode("/sim/systems/electrical/path");
+ _volts_out = fgGetNode( "/systems/electrical/volts", true );
+ _amps_out = fgGetNode( "/systems/electrical/amps", true );
- SG_LOG( SG_ALL, SG_ALERT, "Reading electrical system model from "
- << config.str() );
- try {
- readProperties( config.str(), config_props );
- } catch (const sg_exception& exc) {
- SG_LOG( SG_ALL, SG_ALERT, "Failed to load electrical system model: "
+ if (path_n) {
+ SGPath config( globals->get_fg_root() );
+ config.append( path_n->getStringValue() );
+
+ SG_LOG( SG_ALL, SG_INFO, "Reading electrical system model from "
<< config.str() );
+ try {
+ readProperties( config.str(), config_props );
+
+ if ( build() ) {
+ enabled = true;
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT,
+ "Detected an internal inconsistancy in the electrical");
+ SG_LOG( SG_ALL, SG_ALERT,
+ " system specification file. See earlier errors for" );
+ SG_LOG( SG_ALL, SG_ALERT,
+ " details.");
+ exit(-1);
+ }
+ } catch (const sg_exception& exc) {
+ SG_LOG( SG_ALL, SG_ALERT, "Failed to load electrical system model: "
+ << config.str() );
+ }
+
+ } else {
+ SG_LOG( SG_ALL, SG_WARN,
+ "No electrical model specified for this model!");
}
delete config_props;
}
-void
-ElectricalSystem::bind ()
-{
+
+void FGElectricalSystem::bind () {
}
-void
-ElectricalSystem::unbind ()
-{
+
+void FGElectricalSystem::unbind () {
}
-void
-ElectricalSystem::update (double dt)
-{
+
+void FGElectricalSystem::update (double dt) {
+ if ( !enabled ) {
+ _amps_out->setDoubleValue(0);
+ return;
+ }
+
+ // cout << "Updating electrical system" << endl;
+
+ unsigned int i;
+
+ // zero everything out before we start
+ for ( i = 0; i < suppliers.size(); ++i ) {
+ suppliers[i]->set_volts( 0.0 );
+ suppliers[i]->set_load_amps( 0.0 );
+ }
+ for ( i = 0; i < buses.size(); ++i ) {
+ buses[i]->set_volts( 0.0 );
+ buses[i]->set_load_amps( 0.0 );
+ }
+ for ( i = 0; i < outputs.size(); ++i ) {
+ outputs[i]->set_volts( 0.0 );
+ outputs[i]->set_load_amps( 0.0 );
+ }
+ for ( i = 0; i < connectors.size(); ++i ) {
+ connectors[i]->set_volts( 0.0 );
+ connectors[i]->set_load_amps( 0.0 );
+ }
+
+ // for each supplier, propagate the electrical current
+ for ( i = 0; i < suppliers.size(); ++i ) {
+ // cout << " Updating: " << suppliers[i]->get_name() << endl;
+ propagate( suppliers[i], 0.0, " " );
+ }
+
+ double alt_norm
+ = fgGetDouble("/systems/electrical/suppliers/alternator") / 60.0;
+
+ // impliment an extremely simplistic voltage model (assumes
+ // certain naming conventions in electrical system config)
+ // FIXME: we probably want to be able to feed power from all
+ // engines if they are running and the master-alt is switched on
+ double volts = 0.0;
+ if ( fgGetBool("/controls/engines/engine[0]/master-bat") ) {
+ volts = 24.0;
+ }
+ if ( fgGetBool("/controls/engines/engine[0]/master-alt") ) {
+ if ( fgGetDouble("/engines/engine[0]/rpm") > 800 ) {
+ double alt_contrib = 28.0;
+ if ( alt_contrib > volts ) {
+ volts = alt_contrib;
+ }
+ } else if ( fgGetDouble("/engines/engine[0]/rpm") > 200 ) {
+ double alt_contrib = 20.0;
+ if ( alt_contrib > volts ) {
+ volts = alt_contrib;
+ }
+ }
+ }
+ _volts_out->setDoubleValue( volts );
+
+ // impliment an extremely simplistic amps model (assumes certain
+ // naming conventions in the electrical system config) ... FIXME:
+ // make this more generic
+ double amps = 0.0;
+ if ( fgGetBool("/controls/engines/engine[0]/master-bat") ) {
+ if ( fgGetBool("/controls/engines/engine[0]/master-alt") &&
+ fgGetDouble("/engines/engine[0]/rpm") > 800 )
+ {
+ amps += 40.0 * alt_norm;
+ }
+ amps -= 15.0; // normal load
+ if ( fgGetBool("/controls/switches/flashing-beacon") ) {
+ amps -= 7.5;
+ }
+ if ( fgGetBool("/controls/switches/nav-lights") ) {
+ amps -= 7.5;
+ }
+ if ( amps > 7.0 ) {
+ amps = 7.0;
+ }
+ }
+ _amps_out->setDoubleValue( amps );
+}
+
+
+bool FGElectricalSystem::build () {
+ SGPropertyNode *node;
+ int i;
+
+ int count = config_props->nChildren();
+ for ( i = 0; i < count; ++i ) {
+ node = config_props->getChild(i);
+ string name = node->getName();
+ // cout << name << endl;
+ if ( name == "supplier" ) {
+ FGElectricalSupplier *s =
+ new FGElectricalSupplier( node );
+ suppliers.push_back( s );
+ } else if ( name == "bus" ) {
+ FGElectricalBus *b =
+ new FGElectricalBus( node );
+ buses.push_back( b );
+ } else if ( name == "output" ) {
+ FGElectricalOutput *o =
+ new FGElectricalOutput( node );
+ outputs.push_back( o );
+ } else if ( name == "connector" ) {
+ FGElectricalConnector *c =
+ new FGElectricalConnector( node, this );
+ connectors.push_back( c );
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT, "Unknown component type specified: "
+ << name );
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
+// propagate the electrical current through the network, returns the
+// total current drawn by the children of this node.
+float FGElectricalSystem::propagate( FGElectricalComponent *node, double val,
+ string s ) {
+ s += " ";
+
+ float current_amps = 0.0;
+
+ // determine the current to carry forward
+ double volts = 0.0;
+ if ( !fgGetBool("/systems/electrical/serviceable") ) {
+ volts = 0;
+ } else if ( node->get_kind() == FG_SUPPLIER ) {
+ // cout << s << " is a supplier" << endl;
+ volts = ((FGElectricalSupplier *)node)->get_output();
+ } else if ( node->get_kind() == FG_BUS ) {
+ // cout << s << " is a bus" << endl;
+ volts = val;
+ } else if ( node->get_kind() == FG_OUTPUT ) {
+ // cout << s << " is an output" << endl;
+ volts = val;
+ if ( volts > 1.0 ) {
+ // draw current if we have voltage
+ current_amps = ((FGElectricalOutput *)node)->get_output_amps();
+ }
+ } else if ( node->get_kind() == FG_CONNECTOR ) {
+ // cout << s << " is a connector" << endl;
+ if ( ((FGElectricalConnector *)node)->get_state() ) {
+ volts = val;
+ } else {
+ volts = 0.0;
+ }
+ // cout << s << " val = " << volts << endl;
+ } else {
+ SG_LOG( SG_ALL, SG_ALERT, "unkown node type" );
+ }
+
+ if ( volts > node->get_volts() ) {
+ node->set_volts( volts );
+ }
+
+ int i;
+
+ // publish values to specified properties
+ for ( i = 0; i < node->get_num_props(); ++i ) {
+ fgSetDouble( node->get_prop(i).c_str(), node->get_volts() );
+ }
+ // cout << s << node->get_name() << " -> " << node->get_value() << endl;
+
+ // propagate to all children
+ for ( i = 0; i < node->get_num_outputs(); ++i ) {
+ current_amps += propagate( node->get_output(i), volts, s );
+ }
+
+ // if not an output node, register the downstream current draw
+ // with this node. If volts are zero, current draw should be zero.
+ if ( node->get_kind() != FG_OUTPUT ) {
+ node->set_load_amps( current_amps );
+ }
+ // cout << s << node->get_name() << " -> " << current_amps << endl;
+
+ return current_amps;
+}
+
+
+// search for the named component and return a pointer to it, NULL otherwise
+FGElectricalComponent *FGElectricalSystem::find ( const string &name ) {
+ unsigned int i;
+ string s;
+
+ // search suppliers
+ for ( i = 0; i < suppliers.size(); ++i ) {
+ s = suppliers[i]->get_name();
+ // cout << " " << s << endl;
+ if ( s == name ) {
+ return suppliers[i];
+ }
+ }
+
+ // then search buses
+ for ( i = 0; i < buses.size(); ++i ) {
+ s = buses[i]->get_name();
+ // cout << " " << s << endl;
+ if ( s == name ) {
+ return buses[i];
+ }
+ }
+
+ // then search outputs
+ for ( i = 0; i < outputs.size(); ++i ) {
+ s = outputs[i]->get_name();
+ // cout << " " << s << endl;
+ if ( s == name ) {
+ return outputs[i];
+ }
+ }
+
+ // nothing found
+ return NULL;
}
projects / flightgear.git / blobdiff