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In this paper, a discrete-time flatness-based control for a twin rotor aerodynamic system with two degrees of freedom is proposed that outperforms a standard quasi-continuous implementation, cf. [1]. A control-oriented state-space model is derived using Lagrange's equations. The resulting nonlinear fourth-order model possesses two control inputs, and is affected by two unknown disturbance torques...
This paper proposes a novel adaptive backstepping control for an innovative engine cooling system. The engine cooling system belongs to a special class of nonlinear systems with both matched and mismatched state-dependent lumped disturbances. The parameter update laws resemble a nonlinear reduced-order disturbance observer and guarantee the convergence of the estimated parameter values to the true...
A nonlinear control approach for an innovative engine cooling system in vehicles is presented in this paper. The electrically driven radiator fan is employed as a control input. The engine cooling system represents a special class of nonlinear systems characterized by both matched and mismatched lumped disturbances. Based on a control-oriented system representation, a backstepping-based sliding mode...
In this paper, a robust nonlinear control approach based on a simplified control-oriented model of an engine cooling system for vehicles is presented. An electrically driven radiator fan is considered as a control input. Based on the system description, a second-order sliding mode control is proposed to track desired trajectories of the engine outlet temperature. The second-order sliding mode control...
In this paper, a robust nonlinear control approach based on a control-oriented model of an engine cooling system for vehicles is presented. The angular velocity of an electrically driven radiator fan is considered as the control input to adjust the cooling heat flow corresponding to a desired engine cooling performance. For smooth control actions and an avoidance of chattering, a dynamic sliding mode...
In this paper, a passivity-based tracking control for a twin rotor aerodynamic system (TRAS) with two degrees of freedom is proposed. A control-oriented state-space model is derived using Lagrange's method. The resulting nonlinear fourth-order model possesses two control inputs, and is affected by two unknown disturbance torques due to modelling simplifications and unmeasurable torques. Accordingly,...
In this paper, a multi-variable nonlinear control of a twin rotor aerodynamical system (TRAS) is presented. A control-oriented state-space model with four states is derived employing Lagrange's equations. Using this system representation, a multi-variable flatness-based control is designed for an accurate trajectory tracking concerning both the pitch angle characterising the vertical motion and the...
In this paper, a nonlinear control-oriented model of the thermal behaviour of an engine cooling system for vehicles is presented. The volume flow of an electrically driven coolant pump and the angular velocity of a radiator-fan unit serve as control inputs in a flatness-based nonlinear control approach. A constrained control problem arises due to the given physical bounds on the actuator inputs. Based...
In this paper, a nonlinear control approach based on a control-oriented model of an engine cooling system for vehicles is presented. An electrically driven coolant pump and a servo-controlled bypass valve act as control inputs. Due to physical limitations regarding the volume flow provided by the coolant pump as well as the opening section of the servo-controlled bypass valve, a constrained control...
A nonlinear control approach of an innovative engine cooling system for vehicles is presented in this paper. The electrically driven coolant pump and a servo-controlled bypass valve as control inputs, however, are subject to saturation due to physical limitations of the maximum pump volume flow and the limited opening section of the bypass valve. Based on a control-oriented system representation,...
In this paper, a nonlinear control approach of an innovative engine cooling system for vehicles is presented. The electrically driven coolant pump and a servo-controlled bypass valve as control inputs, however, are subject to saturation due to physical limitations of the maximum pump volume flow and the limited opening section of the bypass valve. Based on a control-oriented system representation,...
In this paper, a comparison of three alternative estimation approaches for a vehicle combustion heating system is presented: 1) a Luenberger observer, 2) a reduced-order observer, and 3) a discrete-time Kalman filter. The estimated temperatures (representing state variables) and unknown disturbance heat flows are employed within a model-predictive on-off control structure. The observer design as well...
In this paper, a control-oriented model of a combustion-heating system for vehicles such as buses, coaches and trucks is developed. Based on this model, a novel model-predictive on-off strategy is proposed for the control of the combustion-heating system. Experiments are carried out to obtain a fair comparison of the predictive on-off controller with a classical on-off controller. The classical on-off...
In this paper, the parity space approach, a modelbased fault detection and isolation scheme, is applied to a hybrid synchronous machine. The aim is to detect additive faults, i.e., faults in the actuators and sensors. The inconsistency between the actual behavior of the process and the expected behavior of the model is represented by means of residuals. For the isolation of faults, a limit checking...
This paper presents a nonlinear model-based control design for an electro-pneumatic clutch for heavy trucks, which is required at start-up or during gear shifts to disconnect the combustion engine from the gear box. This automated actuator disburdens the driver and provides the necessary actuation force according to the large torque transmitted through the powertrain. The proposed cascaded control...
In this paper, a nonlinear control-oriented model of the hybrid synchronous machine is developed using the dq-axis transformation. A flatness-based multi-variable controller is proposed to track a predefined reference trajectory for the angular velocity. Furthermore, a comparison is made for two alternative observer designs. In the first case, a combination of a gain-scheduled Luenberger-type state...
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