#include STL_STRING
#include <vector>
+#include <deque>
SG_USING_STD(string);
SG_USING_STD(vector);
+SG_USING_STD(deque);
#include <simgear/props/props.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
/**
- * A simple proportional controler
+ * Roy Ovesen's PID controller
*/
class FGPIDController : public FGXMLAutoComponent {
private:
- // proportional component data
- bool proportional;
- double factor;
- SGPropertyNode *offset_prop;
- double offset_value;
-
- // integral component data
- bool integral;
- double gain;
- double int_sum;
-
- // prep functions for error term
- bool one_eighty;
-
- // post functions for output
- bool clamp;
-
// debug flag
bool debug;
// Input values
double y_n; // measured process value
double r_n; // reference (set point) value
+ double y_scale; // scale process input from property system
+ double r_scale; // scale reference input from property system
// Configuration values
double Kp; // proportional gain
};
+/**
+ * A simplistic P [ + I ] PID controller
+ */
+
+class FGPISimpleController : public FGXMLAutoComponent {
+
+private:
+
+ // proportional component data
+ bool proportional;
+ double Kp;
+ SGPropertyNode *offset_prop;
+ double offset_value;
+
+ // integral component data
+ bool integral;
+ double Ki;
+ double int_sum;
+
+ // post functions for output
+ bool clamp;
+
+ // debug flag
+ bool debug;
+
+ // Input values
+ double y_n; // measured process value
+ double r_n; // reference (set point) value
+ double y_scale; // scale process input from property system
+ double r_scale; // scale reference input from property system
+
+ double u_min; // Minimum output clamp
+ double u_max; // Maximum output clamp
+
+
+public:
+
+ FGPISimpleController( SGPropertyNode *node );
+ ~FGPISimpleController() {}
+
+ void update( double dt );
+};
+
+
+/**
+ * Predictor - calculates value in x seconds future.
+ */
+
+class FGPredictor : public FGXMLAutoComponent {
+
+private:
+
+ // proportional component data
+ double last_value;
+ double average;
+ double seconds;
+ double filter_gain;
+
+ // debug flag
+ bool debug;
+
+ // Input values
+ double ivalue; // input value
+
+public:
+
+ FGPredictor( SGPropertyNode *node );
+ ~FGPredictor() {}
+
+ void update( double dt );
+};
+
+
+/**
+ * FGDigitalFilter - a selection of digital filters
+ *
+ * Exponential filter
+ * Double exponential filter
+ * Moving average filter
+ * Noise spike filter
+ *
+ * All these filters are low-pass filters.
+ *
+ */
+
+class FGDigitalFilter : public FGXMLAutoComponent
+{
+private:
+ double Tf; // Filter time [s]
+ unsigned int samples; // Number of input samples to average
+ double rateOfChange; // The maximum allowable rate of change [1/s]
+ deque <double> output;
+ deque <double> input;
+ string filterType;
+
+ bool debug;
+
+public:
+ FGDigitalFilter(SGPropertyNode *node);
+ ~FGDigitalFilter() {}
+
+ void update(double dt);
+};
+
/**
* Model an autopilot system.
*