diff options
Diffstat (limited to 'src/lib/ecl/attitude_fw/ecl_roll_controller.cpp')
| -rw-r--r-- | src/lib/ecl/attitude_fw/ecl_roll_controller.cpp | 94 |
1 files changed, 67 insertions, 27 deletions
diff --git a/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp b/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp index 0b1ffa7a4..9894a34d7 100644 --- a/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp +++ b/src/lib/ecl/attitude_fw/ecl_roll_controller.cpp @@ -45,22 +45,66 @@ #include <geo/geo.h> #include <ecl/ecl.h> #include <mathlib/mathlib.h> +#include <systemlib/err.h> ECL_RollController::ECL_RollController() : _last_run(0), _tc(0.1f), + _k_p(0.0f), + _k_i(0.0f), + _k_ff(0.0f), + _integrator_max(0.0f), + _max_rate(0.0f), _last_output(0.0f), _integrator(0.0f), _rate_error(0.0f), _rate_setpoint(0.0f), - _max_deflection_rad(math::radians(45.0f)) + _bodyrate_setpoint(0.0f), + _nonfinite_input_perf(perf_alloc(PC_COUNT, "fw att control roll nonfinite input")) { +} +ECL_RollController::~ECL_RollController() +{ + perf_free(_nonfinite_input_perf); } -float ECL_RollController::control(float roll_setpoint, float roll, float roll_rate, - float scaler, bool lock_integrator, float airspeed_min, float airspeed_max, float airspeed) +float ECL_RollController::control_attitude(float roll_setpoint, float roll) { + /* Do not calculate control signal with bad inputs */ + if (!(isfinite(roll_setpoint) && isfinite(roll))) { + perf_count(_nonfinite_input_perf); + return _rate_setpoint; + } + + /* Calculate error */ + float roll_error = roll_setpoint - roll; + + /* Apply P controller */ + _rate_setpoint = roll_error / _tc; + + /* limit the rate */ //XXX: move to body angluar rates + if (_max_rate > 0.01f) { + _rate_setpoint = (_rate_setpoint > _max_rate) ? _max_rate : _rate_setpoint; + _rate_setpoint = (_rate_setpoint < -_max_rate) ? -_max_rate : _rate_setpoint; + } + + return _rate_setpoint; +} + +float ECL_RollController::control_bodyrate(float pitch, + float roll_rate, float yaw_rate, + float yaw_rate_setpoint, + float airspeed_min, float airspeed_max, float airspeed, float scaler, bool lock_integrator) +{ + /* Do not calculate control signal with bad inputs */ + if (!(isfinite(pitch) && isfinite(roll_rate) && isfinite(yaw_rate) && isfinite(yaw_rate_setpoint) && + isfinite(airspeed_min) && isfinite(airspeed_max) && + isfinite(scaler))) { + perf_count(_nonfinite_input_perf); + return math::constrain(_last_output, -1.0f, 1.0f); + } + /* get the usual dt estimate */ uint64_t dt_micros = ecl_elapsed_time(&_last_run); _last_run = ecl_absolute_time(); @@ -70,10 +114,8 @@ float ECL_RollController::control(float roll_setpoint, float roll, float roll_ra if (dt_micros > 500000) lock_integrator = true; - float k_ff = math::max((_k_p - _k_i * _tc) * _tc - _k_d, 0.0f); - float k_i_rate = _k_i * _tc; - /* input conditioning */ +// warnx("airspeed pre %.4f", (double)airspeed); if (!isfinite(airspeed)) { /* airspeed is NaN, +- INF or not available, pick center of band */ airspeed = 0.5f * (airspeed_min + airspeed_max); @@ -81,32 +123,27 @@ float ECL_RollController::control(float roll_setpoint, float roll, float roll_ra airspeed = airspeed_min; } - float roll_error = roll_setpoint - roll; - _rate_setpoint = roll_error / _tc; - /* limit the rate */ - if (_max_rate > 0.01f) { - _rate_setpoint = (_rate_setpoint > _max_rate) ? _max_rate : _rate_setpoint; - _rate_setpoint = (_rate_setpoint < -_max_rate) ? -_max_rate : _rate_setpoint; - } - - _rate_error = _rate_setpoint - roll_rate; + /* Transform setpoint to body angular rates */ + _bodyrate_setpoint = _rate_setpoint - sinf(pitch) * yaw_rate_setpoint; //jacobian + /* Transform estimation to body angular rates */ + float roll_bodyrate = roll_rate - sinf(pitch) * yaw_rate; //jacobian - float ilimit_scaled = _integrator_max * scaler; + /* Calculate body angular rate error */ + _rate_error = _bodyrate_setpoint - roll_bodyrate; //body angular rate error - if (!lock_integrator && k_i_rate > 0.0f && airspeed > 0.5f * airspeed_min) { + if (!lock_integrator && _k_i > 0.0f && airspeed > 0.5f * airspeed_min) { - float id = _rate_error * k_i_rate * dt * scaler; + float id = _rate_error * dt; /* - * anti-windup: do not allow integrator to increase into the - * wrong direction if actuator is at limit - */ - if (_last_output < -_max_deflection_rad) { + * anti-windup: do not allow integrator to increase if actuator is at limit + */ + if (_last_output < -1.0f) { /* only allow motion to center: increase value */ id = math::max(id, 0.0f); - } else if (_last_output > _max_deflection_rad) { + } else if (_last_output > 1.0f) { /* only allow motion to center: decrease value */ id = math::min(id, 0.0f); } @@ -115,11 +152,14 @@ float ECL_RollController::control(float roll_setpoint, float roll, float roll_ra } /* integrator limit */ - _integrator = math::constrain(_integrator, -ilimit_scaled, ilimit_scaled); - /* store non-limited output */ - _last_output = ((_rate_error * _k_d * scaler) + _integrator + (_rate_setpoint * k_ff)) * scaler; + //xxx: until start detection is available: integral part in control signal is limited here + float integrator_constrained = math::constrain(_integrator * _k_i, -_integrator_max, _integrator_max); + //warnx("roll: _integrator: %.4f, _integrator_max: %.4f", (double)_integrator, (double)_integrator_max); + + /* Apply PI rate controller and store non-limited output */ + _last_output = (_bodyrate_setpoint * _k_ff + _rate_error * _k_p + integrator_constrained) * scaler * scaler; //scaler is proportional to 1/airspeed - return math::constrain(_last_output, -_max_deflection_rad, _max_deflection_rad); + return math::constrain(_last_output, -1.0f, 1.0f); } void ECL_RollController::reset_integrator() |