mirror of https://github.com/ArduPilot/ardupilot
99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
#pragma once
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/// @file AC_PID_Basic.h
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/// @brief Generic PID algorithm, with EEPROM-backed storage of constants.
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#include <AP_Common/AP_Common.h>
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#include <AP_Param/AP_Param.h>
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#include <AP_Logger/AP_Logger.h>
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/// @class AC_PID_Basic
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/// @brief Copter PID control class
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class AC_PID_Basic {
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public:
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// Constructor for PID
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AC_PID_Basic(float initial_p, float initial_i, float initial_d, float initial_ff, float initial_imax, float initial_filt_E_hz, float initial_filt_D_hz, float dt);
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// set time step in seconds
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void set_dt(float dt) { _dt = dt; }
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// set target and measured inputs to PID controller and calculate outputs
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// target and error are filtered
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// the derivative is then calculated and filtered
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// the integral is then updated based on the setting of the limit flag
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float update_all(float target, float measurement, bool limit = false) WARN_IF_UNUSED;
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float update_all(float target, float measurement, bool limit_neg, bool limit_pos) WARN_IF_UNUSED;
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// update the integral
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// if the limit flags are set the integral is only allowed to shrink
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void update_i(bool limit_neg, bool limit_pos);
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// get results from pid controller
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float get_p() const WARN_IF_UNUSED { return _error * _kp; }
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float get_i() const WARN_IF_UNUSED { return _integrator; }
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float get_d() const WARN_IF_UNUSED { return _derivative * _kd; }
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float get_ff() const WARN_IF_UNUSED { return _target * _kff; }
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float get_error() const WARN_IF_UNUSED { return _error; }
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// reset the integrator
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void reset_I() { _integrator = 0.0f; }
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// input and D term filter will be reset to the next value provided to set_input()
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void reset_filter() { _reset_filter = true; }
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// save gain to eeprom
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void save_gains();
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// get accessors
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AP_Float &kP() WARN_IF_UNUSED { return _kp; }
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AP_Float &kI() WARN_IF_UNUSED { return _ki; }
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AP_Float &kD() WARN_IF_UNUSED { return _kd; }
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AP_Float &ff() WARN_IF_UNUSED { return _kff;}
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AP_Float &filt_E_hz() WARN_IF_UNUSED { return _filt_E_hz; }
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AP_Float &filt_D_hz() WARN_IF_UNUSED { return _filt_D_hz; }
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float imax() const WARN_IF_UNUSED { return _kimax.get(); }
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float get_filt_E_alpha() const WARN_IF_UNUSED;
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float get_filt_D_alpha() const WARN_IF_UNUSED;
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// set accessors
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void kP(float v) { _kp.set(v); }
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void kI(float v) { _ki.set(v); }
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void kD(float v) { _kd.set(v); }
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void ff(float v) { _kff.set(v); }
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void imax(float v) { _kimax.set(fabsf(v)); }
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void filt_E_hz(float hz) { _filt_E_hz.set(fabsf(hz)); }
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void filt_D_hz(float hz) { _filt_D_hz.set(fabsf(hz)); }
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// integrator setting functions
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void set_integrator(float target, float measurement, float i);
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void set_integrator(float error, float i);
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void set_integrator(float i);
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const AP_Logger::PID_Info& get_pid_info(void) const WARN_IF_UNUSED { return _pid_info; }
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// parameter var table
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static const struct AP_Param::GroupInfo var_info[];
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protected:
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// parameters
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AP_Float _kp;
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AP_Float _ki;
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AP_Float _kd;
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AP_Float _kff;
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AP_Float _kimax;
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AP_Float _filt_E_hz; // PID error filter frequency in Hz
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AP_Float _filt_D_hz; // PID derivative filter frequency in Hz
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// internal variables
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float _dt; // timestep in seconds
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float _target; // target value to enable filtering
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float _error; // error value to enable filtering
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float _derivative; // last derivative for low-pass filter
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float _integrator; // integrator value
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bool _reset_filter; // true when input filter should be reset during next call to set_input
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AP_Logger::PID_Info _pid_info;
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};
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