mod car model method so returns nonthing

src/controllers/feedback_linearization/PID/first_order/fblin_pid.cpp

@@ -22,5 +22,6 @@ double PIDLin::calculateManipulations(double chi1, double chi1_d, double chi1_do
     chiX_dot_d_ = chi1_dot_d;
     u_aux_ = -control_law_.update(chi1, chi1_d);
     updateControlSignal();
+
     return u_;
 }

src/controllers/feedback_linearization/model_based/SDCs/regulators/vtec_sdc1_pid.cpp

@@ -21,12 +21,12 @@ void VTEC_SDC1_1DOF_PID::updateNonLinearFunctions() {
   PIDLin::g_x_ = sdc1_model_->g_(0);
 }
 
-double VTEC_SDC1_1DOF_PID::calculateControlSignals(double chi1, double chi1_d, double chi1_dot_d) {
+void VTEC_SDC1_1DOF_PID::calculateControlSignals(double chi1, double chi1_d, double chi1_dot_d) {
   // Only in the case of the car, the next condition must be considered, as
   // achieving reverse is not done by computing negative control signals. This
   // must not be programed in any of the base controllers classes, as in the
   // case of the boat and submarine, reverse is straightforward
-  return std::max(calculateManipulations(chi1, chi1_d, chi1_dot_d), 0.);
+  PIDLin::u_ = std::max(calculateManipulations(chi1, chi1_d, chi1_dot_d), 0.);
 }
 
 void VTEC_SDC1_1DOF_PID::updateControlSignals() {

src/controllers/feedback_linearization/model_based/SDCs/regulators/vtec_sdc1_pid.hpp

@@ -21,7 +21,7 @@ class VTEC_SDC1_1DOF_PID : public PIDLin {
 
     void updateNonLinearFunctions();
 
-    double calculateControlSignals(double chi1, double chi1_d, double chi1_dot_d);
+    void calculateControlSignals(double chi1, double chi1_d, double chi1_dot_d);
 
     void updateControlSignals();