Merge pull request #2341 from PX4/mc_offb_vel_limit

Multicopter offboard velocity limit

src/modules/mc_pos_control/mc_pos_control_main.cpp

@@ -1034,6 +1034,21 @@ MulticopterPositionControl::task_main()
 
 				_vel_sp = pos_err.emult(_params.pos_p) + _vel_ff;
 
+				/* make sure velocity setpoint is saturated in xy*/
+				float vel_norm_xy = sqrtf(_vel_sp(0)*_vel_sp(0) + 
+					_vel_sp(1)*_vel_sp(1));
+				if (vel_norm_xy > _params.vel_max(0)) { 
+					/* note assumes vel_max(0) == vel_max(1) */
+					_vel_sp(0) = _vel_sp(0)*_params.vel_max(0)/vel_norm_xy;
+					_vel_sp(1) = _vel_sp(1)*_params.vel_max(1)/vel_norm_xy;
+				}
+
+				/* make sure velocity setpoint is saturated in z*/
+				float vel_norm_z = sqrtf(_vel_sp(2)*_vel_sp(2));
+				if (vel_norm_z > _params.vel_max(2)) {
+					_vel_sp(2) = _vel_sp(2)*_params.vel_max(2)/vel_norm_z;
+				}
+
 				if (!_control_mode.flag_control_altitude_enabled) {
 					_reset_alt_sp = true;
 					_vel_sp(2) = 0.0f;