mirror of https://github.com/ArduPilot/ardupilot
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*
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Generic PI algorithm for controllers that don't need filtering (such as heaters)
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*/
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#include <AP_Math/AP_Math.h>
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#include "AC_PI.h"
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const AP_Param::GroupInfo AC_PI::var_info[] = {
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// @Param: P
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// @DisplayName: PID Proportional Gain
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// @Description: P Gain which produces an output value that is proportional to the current error value
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AP_GROUPINFO("P", 1, AC_PI, kP, 0),
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// @Param: I
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// @DisplayName: PID Integral Gain
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// @Description: I Gain which produces an output that is proportional to both the magnitude and the duration of the error
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AP_GROUPINFO("I", 2, AC_PI, kI, 0),
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// @Param: IMAX
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// @DisplayName: PID Integral Maximum
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// @Description: The maximum/minimum value that the I term can output
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AP_GROUPINFO("IMAX", 3, AC_PI, imax, 0),
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AP_GROUPEND
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};
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// Constructor
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AC_PI::AC_PI(float initial_p, float initial_i, float initial_imax)
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{
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// load parameter values from eeprom
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AP_Param::setup_object_defaults(this, var_info);
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kP.set_and_default(initial_p);
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kI.set_and_default(initial_i);
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imax.set_and_default(initial_imax);
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}
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float AC_PI::update(float measurement, float target, float dt)
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{
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const float err = target - measurement;
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integrator += kI * err * dt;
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integrator = constrain_float(integrator, 0, imax);
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output_P = kP * err;
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return output_P + integrator;
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}
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