tecs: speedrate: use p loop instead of pre calculated speed rate for now

src/lib/external_lgpl/tecs/tecs.cpp

@@ -169,35 +169,45 @@ void TECS::_update_speed_demand(void)
 	// calculate velocity rate limits based on physical performance limits
 	// provision to use a different rate limit if bad descent or underspeed condition exists
 	// Use 50% of maximum energy rate to allow margin for total energy contgroller
-	float velRateMax;
+//	float velRateMax;
-	float velRateMin;
+//	float velRateMin;
+//
+//	if ((_badDescent) || (_underspeed)) {
+//		velRateMax = 0.5f * _STEdot_max / _integ5_state;
+//		velRateMin = 0.5f * _STEdot_min / _integ5_state;
+//
+//	} else {
+//		velRateMax = 0.5f * _STEdot_max / _integ5_state;
+//		velRateMin = 0.5f * _STEdot_min / _integ5_state;
+//	}
+//
+//	// Apply rate limit
+//	if ((_TAS_dem - _TAS_dem_adj) > (velRateMax * 0.1f)) {
+//		_TAS_dem_adj = _TAS_dem_adj + velRateMax * 0.1f;
+//		_TAS_rate_dem = velRateMax;
+//
+//	} else if ((_TAS_dem - _TAS_dem_adj) < (velRateMin * 0.1f)) {
+//		_TAS_dem_adj = _TAS_dem_adj + velRateMin * 0.1f;
+//		_TAS_rate_dem = velRateMin;
+//
+//	} else {
+//		_TAS_dem_adj = _TAS_dem;
+//
+//
+//	_TAS_rate_dem = (_TAS_dem - _TAS_dem_last) / 0.1f;
+//	}
 
-	if ((_badDescent) || (_underspeed)) {
+	_TAS_dem_adj = _TAS_dem;
-		velRateMax = 0.5f * _STEdot_max / _integ5_state;
+	_TAS_rate_dem = (_TAS_dem_adj-_integ5_state)*_speedrate_p; //xxx: using a p loop for now
-		velRateMin = 0.5f * _STEdot_min / _integ5_state;
-
-	} else {
-		velRateMax = 0.5f * _STEdot_max / _integ5_state;
-		velRateMin = 0.5f * _STEdot_min / _integ5_state;
-	}
-
-	// Apply rate limit
-	if ((_TAS_dem - _TAS_dem_adj) > (velRateMax * 0.1f)) {
-		_TAS_dem_adj = _TAS_dem_adj + velRateMax * 0.1f;
-		_TAS_rate_dem = velRateMax;
-
-	} else if ((_TAS_dem - _TAS_dem_adj) < (velRateMin * 0.1f)) {
-		_TAS_dem_adj = _TAS_dem_adj + velRateMin * 0.1f;
-		_TAS_rate_dem = velRateMin;
-
-	} else {
-		_TAS_dem_adj = _TAS_dem;
-		_TAS_rate_dem = (_TAS_dem - _TAS_dem_last) / 0.1f;
-	}
 
 	// Constrain speed demand again to protect against bad values on initialisation.
 	_TAS_dem_adj = constrain(_TAS_dem_adj, _TASmin, _TASmax);
-	_TAS_dem_last = _TAS_dem;
+//	_TAS_dem_last = _TAS_dem;
+
+//	warnx("_TAS_rate_dem: %.1f, _TAS_dem_adj %.1f, _integ5_state %.1f, _badDescent %u , _underspeed %u, velRateMin %.1f",
+//			(double)_TAS_rate_dem, (double)_TAS_dem_adj, (double)_integ5_state, _badDescent, _underspeed, velRateMin);
+//	warnx("_TAS_rate_dem: %.1f, _TAS_dem_adj %.1f, _integ5_state %.1f,  _badDescent %u , _underspeed %u",
+//			(double)_TAS_rate_dem, (double)_TAS_dem_adj, (double)_integ5_state,  _badDescent , _underspeed);
 }
 
 void TECS::_update_height_demand(float demand, float state)

src/lib/external_lgpl/tecs/tecs.h

@@ -184,6 +184,10 @@ public:
 		_heightrate_p = heightrate_p;
 	}
 
+	void set_speedrate_p(float speedrate_p) {
+		_speedrate_p = speedrate_p;
+	}
+
 private:
 	// Last time update_50Hz was called
 	uint64_t _update_50hz_last_usec;
@@ -208,6 +212,7 @@ private:
 	float _rollComp;
 	float _spdWeight;
 	float _heightrate_p;
+	float _speedrate_p;
 
 	// throttle demand in the range from 0.0 to 1.0
 	float _throttle_dem;

src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp

@@ -217,6 +217,7 @@ private:
 		float loiter_hold_radius;
 
 		float heightrate_p;
+		float speedrate_p;
 
 		float land_slope_angle;
 		float land_slope_length;
@@ -260,6 +261,7 @@ private:
 		param_t loiter_hold_radius;
 
 		param_t heightrate_p;
+		param_t speedrate_p;
 
 		param_t land_slope_angle;
 		param_t land_slope_length;
@@ -431,6 +433,7 @@ FixedwingPositionControl::FixedwingPositionControl() :
 	_parameter_handles.speed_weight = 			param_find("FW_T_SPDWEIGHT");
 	_parameter_handles.pitch_damping = 			param_find("FW_T_PTCH_DAMP");
 	_parameter_handles.heightrate_p =			param_find("FW_T_HRATE_P");
+	_parameter_handles.speedrate_p =			param_find("FW_T_SRATE_P");
 
 	/* fetch initial parameter values */
 	parameters_update();
@@ -497,6 +500,7 @@ FixedwingPositionControl::parameters_update()
 	param_get(_parameter_handles.max_climb_rate, &(_parameters.max_climb_rate));
 
 	param_get(_parameter_handles.heightrate_p, &(_parameters.heightrate_p));
+	param_get(_parameter_handles.speedrate_p, &(_parameters.speedrate_p));
 
 	param_get(_parameter_handles.land_slope_angle, &(_parameters.land_slope_angle));
 	param_get(_parameter_handles.land_slope_length, &(_parameters.land_slope_length));
@@ -523,6 +527,7 @@ FixedwingPositionControl::parameters_update()
 	_tecs.set_indicated_airspeed_max(_parameters.airspeed_max);
 	_tecs.set_max_climb_rate(_parameters.max_climb_rate);
 	_tecs.set_heightrate_p(_parameters.heightrate_p);
+	_tecs.set_speedrate_p(_parameters.speedrate_p);
 
 	/* sanity check parameters */
 	if (_parameters.airspeed_max < _parameters.airspeed_min ||

src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c

@@ -113,6 +113,7 @@ PARAM_DEFINE_FLOAT(FW_T_PTCH_DAMP, 0.0f);
 PARAM_DEFINE_FLOAT(FW_T_SINK_MAX, 5.0f);
 
 PARAM_DEFINE_FLOAT(FW_T_HRATE_P, 0.05f);
+PARAM_DEFINE_FLOAT(FW_T_SRATE_P, 0.05f);
 
 PARAM_DEFINE_FLOAT(FW_LND_ANG, 10.0f);
 PARAM_DEFINE_FLOAT(FW_LND_SLLR, 0.9f);