This paper is concerned with global stabilization via output feedback for a class of stochastic nonlinear systems with time-varying continuous output function.Under linear growth conditions, a new double-domination method is proposed for the first time to construct an output-feedback stabilizing controller. Different from the related results, the design of the observer is performed without using the information on the output function and nonlinearities. This paper also provides a viewpoint at the feedback stabilization to eliminate the continuous measurement error originating from inaccurate detection of system state.A simulation example is presented to demonstrate the effectiveness of control strategy.

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In this paper, we consider the dual-rate sampled-data state-feedback control problem for an active suspension system of an electric vehicle. In the active suspension system, there exist 2 accelerometers to measure the heave acceleration of the sprung mass and the vertical acceleration of the unsprung mass, respectively. When the 2 accelerations are measured by sampled data under different sampling periods, the difficulty arising from the dual-rate sampled data makes the active suspension stabilization problem challenging but interesting. In this paper, a linear hybrid stabilizer is proposed, which is implemented using dual-rate sampled-data state feedback. In order to deal with the more difficult stabilization problem under different triggering time instants, a coordinate transformation is proposed. A useful technical theorem is proposed in the stability analysis to show that the proposed hybrid controller can guarantee the states of the active suspension system being asymptotically stabilized or at least bounded to arbitrarily small domains. The experiment result is similar to the simulation result and indicates that the proposed active suspension controlling system is effective. KEYWORDS active suspension system, dual-rate, sampled-data control INTRODUCTIONElectric vehicles (EVs) driven by in-wheel motors have potential for energy efficiency and environmental protection. In recent decades, vehicle motion control, energy optimization, and performance benefits 1-4 have gained the attention of researchers. The chassis (sprung mass) of an EV is connected to 4 wheels (unsprung masses) by the suspension system. The in-wheel motors increase the unsprung mass, affecting the ride comfort and handling of the EV. 5 The suspension system has 2 functions, ie, one is to handle the vehicle's roadholding and braking for good active safety and driving pleasure, and the other one is to keep vehicle occupants comfortable and provide a ride quality reasonably well isolated from road profiles. If the suspension system is externally controlled, then it is a semiactive or active suspension.Active suspension is a type of automotive suspension that controls the vertical displacement of the wheels relative to the chassis or vehicle body, as opposed to a passive suspension where the displacement is determined entirely by the road profiles. Such an active suspension system includes an electrically powered actuator and a gas spring that cooperatively provide the support between the sprung and unsprung masses of the vehicle. Active suspension systems for vehicles have more recently been introduced to reduce movement of the sprung vehicle mass by reacting to force inputs from the 1610

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In this paper, the authors consider the problem of tyre blowout control via output feedback for an electric vehicle (EV) driven by four in-wheel motors to reduce fatal damage. First, an EV dynamic model in the case of a tyre blowout is established. The model considers the unmeasurable state, unknown added front wheel steering angle generated by a tyre blowout and uncertain external disturbances. Second, to address the difficulties in estimating the unmeasurable state, unknown parameters and disturbances for the EV, a finite-time observer is introduced. Then, by introducing a coordinate transformation, the state-space model of an EV with tyre blowout is converted into a simple form for which a state feedback control law is constructed by adding a power integrator method. Combining the finite-time observer with the finite-time control law, an output feedback controller is designed to stabilize the EV when a tyre bursts. A torque allocation method is also given to operate every wheel except the burst tyre to stabilize and stop the EV. Finally, computer simulations are given to validate the proposed finite-time output feedback controller for the EV tyre blowout control.

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In an active suspension system, there is an actuator mounted between the sprung mass and the unsprung mass to change the stiffness and damp of the suspension for ride comfort and handling stability. Because the active suspension control system is an under‐actuated system, the control problem of the active suspension is challenging but interesting. In order to solve this issue, a novel vehicle active suspension control method based on homogeneous domination approach is proposed in this paper. Firstly, a groundhook control model is constructed according to the general active suspension dynamic model. In order to deal with the additional terms of the control system which are harmful for convergence, a homogeneous domination approach is used to construct an active suspension homogeneous controller (ASHC). A useful technical theorem is proposed in the stability analysis to show that the proposed ASHC can guarantee the states of the active suspension system being stabilized. Compared with the SMC method and without any controller (passive suspension), the simulation results indicate that the proposed ASHC is effective.