TECS: some cosmetics

Signed-off-by: RomanBapst <bapstroman@gmail.com>
This commit is contained in:
RomanBapst
2021-01-13 21:21:07 +03:00
committed by Roman Bapst
parent 97cc1e25dd
commit d4d1c0fe01
2 changed files with 25 additions and 27 deletions
+21 -20
View File
@@ -254,10 +254,10 @@ void TECS::_update_energy_estimates()
// Calculate the specific energy balance demand which specifies how the available total
// energy should be allocated to speed (kinetic energy) and height (potential energy)
float SEB_setpoint = _SPE_setpoint * _SPE_weight - _SKE_setpoint * _SKE_weight;
float SEB_setpoint = _SPE_setpoint * _SPE_weighting - _SKE_setpoint * _SKE_weighting;
// Calculate the specific energy balance error
_SEB_error = SEB_setpoint - (_SPE_estimate * _SPE_weight - _SKE_estimate * _SKE_weight);
_SEB_error = SEB_setpoint - (_SPE_estimate * _SPE_weighting - _SKE_estimate * _SKE_weighting);
// Calculate specific energy rate demands in units of (m**2/sec**3)
_SPE_rate_setpoint = _hgt_rate_setpoint * CONSTANTS_ONE_G; // potential energy rate of change
@@ -416,10 +416,10 @@ void TECS::_update_pitch_setpoint()
*/
// Calculate the specific energy balance rate demand
const float SEB_rate_setpoint = _SPE_rate_setpoint * _SPE_weight - _SKE_rate_setpoint * _SKE_weight;
const float SEB_rate_setpoint = _SPE_rate_setpoint * _SPE_weighting - _SKE_rate_setpoint * _SKE_weighting;
// Calculate the specific energy balance rate error
_SEB_rate_error = SEB_rate_setpoint - (_SPE_rate * _SPE_weight - _SKE_rate * _SKE_weight);
_SEB_rate_error = SEB_rate_setpoint - (_SPE_rate * _SPE_weighting - _SKE_rate * _SKE_weighting);
// Calculate derivative from change in climb angle to rate of change of specific energy balance
const float climb_angle_to_SEB_rate = _tas_state * CONSTANTS_ONE_G;
@@ -444,26 +444,27 @@ void TECS::_update_pitch_setpoint()
}
// Calculate a specific energy correction that doesn't include the integrator contribution
float SEB_correction = _SEB_rate_error * _pitch_damping_gain + _pitch_integ_state + SEB_rate_setpoint;
float SEB_rate_correction = _SEB_rate_error * _pitch_damping_gain + _pitch_integ_state + SEB_rate_setpoint;
// During climbout, bias the demanded pitch angle so that a zero speed error produces a pitch angle
// demand equal to the minimum pitch angle set by the mission plan. This prevents the integrator
// having to catch up before the nose can be raised to reduce excess speed during climbout.
if (_climbout_mode_active) {
SEB_correction += _pitch_setpoint_min * climb_angle_to_SEB_rate;
SEB_rate_correction += _pitch_setpoint_min * climb_angle_to_SEB_rate;
}
// Convert the specific energy balance correction to a target pitch angle. This calculation assumes:
// Convert the specific energy balance rate correction to a target pitch angle. This calculation assumes:
// a) The climb angle follows pitch angle with a lag that is small enough not to destabilise the control loop.
// b) The offset between climb angle and pitch angle (angle of attack) is constant, excluding the effect of
// pitch transients due to control action or turbulence.
_pitch_setpoint_unc = SEB_correction / climb_angle_to_SEB_rate;
_pitch_setpoint = constrain(_pitch_setpoint_unc, _pitch_setpoint_min, _pitch_setpoint_max);
_pitch_setpoint_unc = SEB_rate_correction / climb_angle_to_SEB_rate;
float pitch_setpoint = constrain(_pitch_setpoint_unc, _pitch_setpoint_min, _pitch_setpoint_max);
// Comply with the specified vertical acceleration limit by applying a pitch rate limit
const float ptchRateIncr = _dt * _vert_accel_limit / _tas_state;
_pitch_setpoint = constrain(_pitch_setpoint, _last_pitch_setpoint - ptchRateIncr, _last_pitch_setpoint + ptchRateIncr);
_last_pitch_setpoint = _pitch_setpoint;
_last_pitch_setpoint = constrain(pitch_setpoint, _last_pitch_setpoint - ptchRateIncr,
_last_pitch_setpoint + ptchRateIncr);
}
void TECS::_initialize_states(float pitch, float throttle_cruise, float baro_altitude, float pitch_min_climbout,
@@ -612,37 +613,37 @@ void TECS::update_pitch_throttle(const matrix::Dcmf &rotMat, float pitch, float
void TECS::_update_speed_height_weights()
{
// Calculate the weight applied to control of specific kinetic energy error
_SKE_weight = constrain(_pitch_speed_weight, 0.0f, 2.0f);
_SKE_weighting = constrain(_pitch_speed_weight, 0.0f, 2.0f);
if ((_underspeed_detected || _climbout_mode_active) && airspeed_sensor_enabled()) {
_SKE_weight = 2.0f;
_SKE_weighting = 2.0f;
} else if (!airspeed_sensor_enabled()) {
_SKE_weight = 0.0f;
_SKE_weighting = 0.0f;
}
// don't allow any weight to be larger than one, as it has the same effect as reducing the control
// loop time constant and therefore can lead to a destabilization of that control loop
_SPE_weight = constrain(2.0f - _SKE_weight, 0.f, 1.f);
_SKE_weight = constrain(_SKE_weight, 0.f, 1.f);
_SPE_weighting = constrain(2.0f - _SKE_weighting, 0.f, 1.f);
_SKE_weighting = constrain(_SKE_weighting, 0.f, 1.f);
}
float TECS::SEB()
{
return _SPE_estimate * _SPE_weight - _SKE_estimate * _SKE_weight;
return _SPE_estimate * _SPE_weighting - _SKE_estimate * _SKE_weighting;
}
float TECS::SEB_setpoint()
{
return _SPE_setpoint * _SPE_weight - _SKE_setpoint * _SKE_weight;
return _SPE_setpoint * _SPE_weighting - _SKE_setpoint * _SKE_weighting;
}
float TECS::SEB_rate()
{
return _SPE_rate * _SPE_weight - _SKE_rate * _SKE_weight;
return _SPE_rate * _SPE_weighting - _SKE_rate * _SKE_weighting;
}
float TECS::SEB_rate_setpoint()
{
return _SPE_rate_setpoint * _SPE_weight - _SKE_rate_setpoint * _SKE_weight;
return _SPE_rate_setpoint * _SPE_weighting - _SKE_rate_setpoint * _SKE_weighting;
}