Robert Boschgmbh

Peter Buerk

Stefan Koch

Martin Kessler

Karl Preis

A method for controlling a first fan motor using a first pulse width modulation signal having a first pulse control factor, and for controlling a second fan motor using a second pulse width modulation signal having a second pulse control factor, so as to bring about an overall air output according to a prespecified setpoint air output by the operation of the first and the second fan motor, a low-pass filter being provided in parallel to the fan motors in order to smooth out voltage fluctuations in voltage supply lines, wherein the first and the second pulse control factor are made available independently of each other, in order to minimize the current through the low-pass filter.

Method and control unit for controlling fan motors

A method is described for determining an operating state on triggering a fan motor, the fan motor being operated with the aid of a switching device, the switching device being activated via a pulse-width-modulated triggering signal, a pulse duty factor of the triggering signal predefining a triggering state of the fan motor, a voltage potential at the node between fan motor and switching device or a motor current being measured as a measured variable, an operating state being determined on triggering the fan motor as a function of the measured variable and the pulse duty factor.

Method and control circuit for determining an operating state when controlling a fan motor

A method for reducing line-conducted interference in a pulse width modulated triggering system of an electric motor, a triggering pulse width modulation signal having, in one clock cycle, one or more signal edges between a first signal level and a second signal level, the pulse width modulation signal being generated in such a way that at least one of the signal edges has a first segment having a first edge slope and a second segment having a second edge slope, the absolute value of the first edge slope being less than the absolute value of the second edge slope.

Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor

The invention relates to a circuit arrangement and a method for operating an electric motor in a direct voltage source, in particular for operating a permanent-magnet-excited DC motor in the direct voltage network of a motor vehicle, having a rotary position transducer () for detecting the rotary position of the rotor (), and having an electronic commutation controller () for switching over the current in the armature winding of the stator () as a function of the position of the rotor (). It is proposed that the rotary position transducer () is positioned relative to the stator () for an early commutation, and that the actual commutation time can be set by means of a delay correction, ascertained by measurement separately for each motor (), in the electronic commutation controller ().

Circuit arrangement and method for operation of an electric motor in a DC supply network

A control device for operating a wiper motor (10) which utilizes the typical path of the wiper motor current (Im) with cyclically recurring minima during the detection of an overload of the wiper motor (10) caused by blockage or tightness of the wiper. During this process, a storage element (C) that integrates the motor current (Im) is short-circuited at least twice within a wiping cycle (Tw) during normal operation so that the transfer of the admissible overload from a half of a wiping cycle (Tw/2) to the following half of the wiping cycle (Tw/2) is prevented and the limit value (G) for the shut-down of the wiper motor (10) is not reached through accumulation of the admissible overload.

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Lichtenau-Grauelsbaum, Germany

Peter Buerk