Abstract: Proposed is a method for controlling an internal combustion engine (1) with a common-rail injection system and a high-pressure control loop. In this method, a pump with an intake throttle (3) is controlled by means of an electronic control device (4) using a PWM signal with a first frequency. The invention provides that a critical speed is calculated from the angular distance between injections and the first frequency of the PWM signal. A speed range is then determined as a function of the critical speed. For engine speed values that fall outside this speed range, the PWM signal is set to the first frequency. For engine speed values that fall within the speed range, the PWM signal is set to a second frequency. Switching the PWM signal reduces the pressure oscillations in the rail (6).

Abstract: A diagnostic function for an internal-combustion engine whose power is set by way of a power-determining signal that is determined from a first signal from a determination device, and a second signal determined by a torque controller, based on engine torque. A selection device sets either the determination device or the torque controller to be dominant for the power determining signal. When the values of the engine torque are not plausible, an error mode is set. With the setting of the error mode, the dominance is retained when the determination device is dominant. When the torque controller is dominant, a change of the dominance takes place.

Abstract: The invention relates to a system for regulating an internal cumbustion engine (1). Said system regulates the maximum combustion pressure by modifying the start of the injection process. The aim of the invention is to improve the operational reliability of the internal combustion engine (1). To this end, the invention provides that the maximum combustion pressure (pMAX(i)) is diagnosed by the detection of a freak value. This then determines a first or second mode and sets a diagnosis value depending on the modi. The invention also provides that the output of the injection start regulator is limited by a limiting mechanism.

Abstract: A common rail injection system for an internal combustion engine, wherein upon detection of a defective rail sensor system the transition from the normal operation to the emergency operation is determined reliably by means of a transition function. The transition function is determined beforehand from the characteristics of a system deviation as a function of time during normal operation. In so doing, the system deviation is calculated from the a variance comparison of the rail pressure. The result of this defect transition process is a more noise-proof and more continuous transition from the normal operation to the emergency operation.

Abstract: A control system for protecting an internal combustion engine from overloading. The output of the internal combustion engine is adjusted with an output-determining signal according to an input signal which characterizes the desired output. According to the invention, a differential torque is calculated from the current motor torque and a maximum permissible motor torque. The differential torque in turn determines an authoritative second signal. A first signal that is determined from an input signal characterizing the desired output and the second signal are directed to a selector which selects the first or second signal as the signal that determines the output.

Abstract: The invention proposes a speed filter (11) for an internal combustion engine. The speed filter (11) comprises a calculation rule (BV(i)), which is used to eliminate a torsional vibration of the ith order completely or partially. The dynamics as well as the robustness of the speed control loop are increased in this way.

Abstract: In a method of controlling a drive unit, particularly an internal-combustion engine generator unit, in addition to first and second controlling devices, a third controlling device is provided for computing a third injection quantity. One of the controlling devices is set as dominant for controlling the rotational speed. From an operator determined charge definition, a charge injection quantity is computed, and is compared with the injection quantity of the dominant controlling device. As a function of the comparison, the dominance of the controlling device is retained or the charge definition is set to be dominant for a power-determining signal.

Abstract: In a method of controlling a drive unit, particularly an internal-combustion engine generator unit, in addition to first and second controlling devices, a third controlling device is provided for computing a third injection quantity. One of the controlling devices is set as dominant for controlling the rotational speed. From an operator determined charge definition, a charge injection quantity is computed, and is compared with the injection quantity of the dominant controlling device. As a function of the comparison, the dominance of the controlling device is retained or the charge definition is set to be dominant for a power-determining signal.

Abstract: A diagnostic function for an internal-combustion engine whose power is set by way of a power-determining signal that is determined from a first signal from a determination device, and a second signal determined by a torque controller, based on engine torque. A selection device sets either the determination device or the torque controller to be dominant for the power determining signal. When the values of the engine torque are not plausible, an error mode is set. With the setting of the error mode, the dominance is retained when the determination device is dominant. When the torque controller is dominant, a change of the dominance takes place.

Abstract: The invention relates to a system for regulating an internal combustion engine (1). Said system regulates the maximum combustion pressure by modifying the start of the injection process. The aim of the invention is to improve the operational reliability of the internal combustion engine (1) To this end, the invention provides that the maximum combustion pressure (pMAX(i)) is diagnosed by the detection of a freak value. This then determines a first or second mode and sets a diagnosis value depending on the modi.

Abstract: For an internal combustion engine serving as a ship's propulsion unit or a generator drive, it is proposed, in operation within the range of the nominal output point, with the occurrence of a significant load change on the power take-off, to shift the injection start toward late. A significant load change on the power take-off is to be understood as the broaching of the ship's propulsion unit or the load rejection in generator operation. The shift of the injection start toward late provides the advantage that the speed control is additionally supported.