Abstract: A method is provided for regulating an actual value of a variable, which characterizes a position of an actuator, to a setpoint value using a regulator, which method makes it possible to optimize regulation in terms of bandwidth, stability, accuracy, and sturdiness. A predefined time characteristic of the setpoint value is transformed into a desired time characteristic of the actual value. A first transfer function is formed in the frequency domain and is approximated using one or more factors, in particular delay elements, to transform the predefined time characteristic of the setpoint value into the desired time characteristic of the actual value. A nonintegral exponent is selected for at least one of the factors.

Abstract: In a method for controlling an actuating device of a valve element of an intake system and/or an exhaust gas system of the internal combustion using an actuating variable, a periodic compensation signal is applied, at least intermittently, to the actuating device. The compensation signal generates a periodic counterforce at the valve element which is directed in the opposite direction from the periodic force exerted by the undesired disturbing vibrations of the valve element.

Abstract: In a method for controlling an actuating device of a valve element of an intake system and/or an exhaust gas system of the internal combustion using an actuating variable, a periodic compensation signal is applied, at least intermittently, to the actuating device. The compensation signal generates a periodic counterforce at the valve element which is directed in the opposite direction from the periodic force exerted by the undesired disturbing vibrations of the valve element.

Abstract: In a method for controlling an actuating device of a valve element of an intake system and/or an exhaust gas system of the internal combustion using an actuating variable, a periodic compensation signal is applied, at least intermittently, to the actuating device. The compensation signal generates a periodic counterforce at the valve element which is directed in the opposite direction from the periodic force exerted by the undesired disturbing vibrations of the valve element.

Abstract: The frequency synthesizer includes a phase-locked loop (PLL). The PLL includes an oscillator controlled to deliver an output signal at a predefined output frequency, a variable frequency divider to convert the output signal into a divided-frequency signal, a phase comparator to produce a signal measuring a phase difference between the divided-frequency signal and a reference signal at a reference frequency, and a loop filter to control the oscillator on the basis of the measurement signal. To increase the speed of convergence of the synthesizer if the set point is changed, the loop filter of the PLL is a fractional, i.e. non-integer, order low-pass filter.

Abstract: Method and device for controlling the angular speed of an electromechanical drive train with little damping. The control of the speed of the load driven in rotation by an electromechanical drive train with little damping, possibly having transmission nonlinearities such as play, without measuring said speed, is accomplished by using an observer in conjunction with a robust CRONE-type non-integer order controller, the physical realization of which is achieved by an integer order controller obtained by approximation in the frequency domain. The device thus provides good damping for the system in the presence of resonance frequencies and excellent robustness, while still allowing a relatively simple adjustment.

Abstract: The invention concerns a method and a device for controlling the angular speed of an electromechanical chain with low damping. Speed control of a load (10) driven in rotation by an electromechanical chain with low damping, possibly having transmission nonlinearities such as clearances, without measuring said speed, is provided by jointly using an observer (18) and a robust corrector (20) of non integer order, of the CRONE type, whereof the physical execution is provided by a corrector of integer order, obtained by approximation in the frequency domain. The device thus provides proper damping of the system in the presence of resonant frequencies and excellent robustness, while enabling a relatively simple adjustment.

Abstract: An arrangement for damping movement of a mass with respect to a support to which the mass is connected by a suspension device. The suspension device is provided with one or more springs and a hydraulic damping system through which a hydraulic fluid flows. One or more devices are present for wire-drawing this fluid through a respective aperture. Each wire-drawing device is arranged to continuously vary the damping characteristics by controlling the extent of opening of the aperture(s) and thus regulate the flow of the fluid through the hydraulic damping system.