Abstract: A method for operating a pump of a delivery unit, in particular of a fluid supply system, having a pump chamber and an actively controllable inlet valve and an actively controllable outlet valve for the pump chamber, wherein, for the delivery of a fluid, a pressure (p), which is to be provided by the pump, of the fluid for delivery is controlled in closed-loop fashion on the basis of a manipulated variable (V), and wherein, within one full cycle (Z) of the pump (200), at least one of inlet valve (211) and outlet valve (212) is activated only if fluid is to be delivered, and is not activated if no fluid is to be delivered, and to a fluid supply system.

Abstract: A method for operating a pump of a delivery unit, in particular of a fluid supply system, having a pump chamber and an actively controllable inlet valve and an actively controllable outlet valve for the pump chamber, wherein, for the delivery of a fluid, a pressure (p), which is to be provided by the pump, of the fluid for delivery is controlled in closed-loop fashion on the basis of a manipulated variable (V), and wherein, within one full cycle (Z) of the pump (200), at least one of inlet valve (211) and outlet valve (212) is activated only if fluid is to be delivered, and is not activated if no fluid is to be delivered, and to a fluid supply system.

Abstract: The invention relates to a communication interface between a control unit and an electric load unit, particularly a load unit having a pump motor in a motor vehicle, wherein the control unit is designed as a transmitter and/or receiver, wherein the load unit is designed as a receiver and/or transmitter and wherein the communication between the transmitter and the receiver takes place via a signal line by means of a pulse-width-modulated signal. In this case, there is provision for the signal line to be connected to a constant current source and for the transmitter to be designed to modulate the flow of current through the signal line by means of pulse-width modulation. The invention further relates to a method for operating such a communication interface.

Abstract: A method for controlling an SCR system having two metering valves and a feed pump, wherein the two metering valves are operated in such a way that a reducing agent solution is metered in simultaneously via the two metering valves, at least over part of a metering time period (tDos).

Abstract: A method is disclosed for determining a current temperature of a heating element with a PTC thermistor property (PTC) with which a urea-water solution for cleaning the exhaust gas in an internal combustion engine of nitrogen oxides can be heated. According to the invention there is provision that a correction factor is formed from the quotient of a minimum resistance of the heating element and of a minimum resistance of a reference heating element, in that a resistance which is determined at a current temperature of the heating element is multiplied by the correction factor, and in that the current temperature of the heating element is determined from the corrected resistance value and a temperature dependence of the resistance of the reference heating element. The method according to the invention permits more precise determination and regulation of the temperature of the heating element.

Abstract: The invention relates to a method for heating a device driven with a brushless direct current motor, in which method a voltage is applied to stator coils of the brushless direct current motor during a heating phase. The invention further relates to a device for carrying out said method. According to the invention, the stator coils are series-connected during the heating phase. The series connection of the stator coils increases the resistance by a factor of 4.5 compared to a parallel connection of a stator coil with a series connection of two stator coils, as occurs in a brushless direct current motor wired according to the prior art. The heating power is therefore also higher by a factor of 4.5 with the same operating current.

Abstract: A method is proposed for operating a metering valve which is realized as a solenoid valve which is actuated by an electromagnet that interacts with an armature which is connected fixedly to a valve needle and, furthermore, is loaded with a pulse-width modulated metering signal which defines the metering of a reagent which is to be introduced into the exhaust-gas region of an internal combustion engine or of a preliminary stage of a reagent, as is an apparatus for carrying out the method. The opening duration of the metering valve is limited to a minimum opening duration, for which the metering valve is opened completely and which is fixed in such a way that a spray mist is always produced during the metering. The procedure according to this invention prevents the reagent from crystallizing and, as a result, firstly ensures exact metering of the reagent and secondly counteracts clogging of the metering valve, in particular if a urea/water solution is provided as preliminary stage of the reagent.

Abstract: The invention relates to a method for heating a device driven with a brushless direct current motor, in which method a voltage is applied to stator coils of the brushless direct current motor during a heating phase. The invention further relates to a device for carrying out said method. According to the invention, the stator coils are series-connected during the heating phase. The series connection of the stator coils increases the resistance by a factor of 4.5 compared to a parallel connection of a stator coil with a series connection of two stator coils, as occurs in a brushless direct current motor wired according to the prior art. The heating power is therefore also higher by a factor of 4.5 with the same operating current.

Abstract: The invention relates to a communication interface between a control unit and an electric load unit, particularly a load unit having a pump motor in a motor vehicle, wherein the control unit is designed as a transmitter and/or receiver, wherein the load unit is designed as a receiver and/or transmitter and wherein the communication between the transmitter and the receiver takes place via a signal line by means of a pulse-width-modulated signal. In this case, there is provision for the signal line to be connected to a constant current source and for the transmitter to be designed to modulate the flow of current through the signal line by means of pulse-width modulation. The invention further relates to a method for operating such a communication interface.

Abstract: A method for controlling an SCR system having two metering valves and a feed pump, wherein the two metering valves are operated in such a way that a reducing agent solution is metered in simultaneously via the two metering valves, at least over part of a metering time period (tDos).

Abstract: A method is disclosed for determining a current temperature of a heating element with a PTC thermistor property (PTC) with which a urea-water solution for cleaning the exhaust gas in an internal combustion engine of nitrogen oxides can be heated. According to the invention there is provision that a correction factor is formed from the quotient of a minimum resistance of the heating element and of a minimum resistance of a reference heating element, in that a resistance which is determined at a current temperature of the heating element is multiplied by the correction factor, and in that the current temperature of the heating element is determined from the corrected resistance value and a temperature dependence of the resistance of the reference heating element. The method according to the invention permits more precise determination and regulation of the temperature of the heating element.

Abstract: In a method for controlling an electromagnetic valve, the temperature of the valve is detected, and activation of and/or the current feed to the valve are performed as a function of the temperature of the valve.

Abstract: In a device for controlling an electromagnetic valve, input device(s) write a multitude of measured values for the current and/or the voltage into a first memory to represent a characteristic. Analysis device(s) perform a state analysis and/or a change-over-time analysis. On the basis of the state analysis and/or the change-over-time analysis, evaluation device(s) correct at least one control variable, which characterizes the control, and write it into a second memory. Control device(s) control an output stage on the basis of the control variables.

Abstract: A method is proposed for operating a metering valve which is realized as a solenoid valve which is actuated by an electromagnet that interacts with an armature which is connected fixedly to a valve needle and, furthermore, is loaded with a pulse-width modulated metering signal which defines the metering of a reagent which is to be introduced into the exhaust-gas region of an internal combustion engine or of a preliminary stage of a reagent, as is an apparatus for carrying out the method. The opening duration of the metering valve is limited to a minimum opening duration, for which the metering valve is opened completely and which is fixed in such a way that a spray mist is always produced during the metering. The procedure according to this invention prevents the reagent from crystallizing and, as a result, firstly ensures exact metering of the reagent and secondly counteracts clogging of the metering valve, in particular if a urea/water solution is provided as preliminary stage of the reagent.

Abstract: A procedure for checking the functionality of an electric heating device (10) with at least one PTC-element (13, 14) is suggested. The electric heating device (10) is operated at a battery voltage. When controlling the heating device (10) it is impinged with a current and at least one measuring value is detected, which represents the current that flows through the heating device. The measuring value for the current is compared to at least one reference value with a default tolerance width while considering the battery voltage. In the case of a measuring value that deviates from the reference value an error can be assumed.

Abstract: A procedure for dosing a reducing agent into the exhaust gas of an combustion engine with a valve is presented, which shows a solenoid and a movable seal body for adjusting a percolation profile, whose value is depending on the current through the solenoid, whereby the valve is triggered by a current profile, which shows two consecutive sectors. The procedure distinguishes itself in that it is checked in the first sector whether the valve is frozen or whether a danger of freezing exists, and that an electric energy that has been fed into the solenoid with the electric current is set in the second sector depending on the result of the checking. Furthermore a controller is introduced, which is customized for controlling the process of such a procedure.

Abstract: In a method for controlling an electromagnetic valve, the temperature of the valve is detected, and activation of and/or the current feed to the valve are performed as a function of the temperature of the valve.

Abstract: A procedure for checking the functionality of an electric heating device (10) with at least one PTC-element (13, 14) is suggested. The electric heating device (10) is operated at a battery voltage. When controlling the heating device (10) it is impinged with a current and at least one measuring value is detected, which represents the current that flows through the heating device. The measuring value for the current is compared to at least one reference value with a default tolerance width while considering the battery voltage. In the case of a measuring value that deviates from the reference value an error can be assumed.

Abstract: In a device for controlling an electromagnetic valve, input device(s) write a multitude of measured values for the current and/or the voltage into a first memory to represent a characteristic. Analysis device(s) perform a state analysis and/or a change-over-time analysis. On the basis of the state analysis and/or the change-over-time analysis, evaluation device(s) correct at least one control variable, which characterizes the control, and write it into a second memory. Control device(s) control an output stage on the basis of the control variables.

Abstract: A method is proposed for operating a metering valve which is realized as a solenoid valve which is actuated by an electromagnet that interacts with an armature which is connected fixedly to a valve needle and, furthermore, is loaded with a pulse-width modulated metering signal which defines the metering of a reagent which is to be introduced into the exhaust-gas region of an internal combustion engine or of a preliminary stage of a reagent, as is an apparatus for carrying out the method. The opening duration of the metering valve is limited to a minimum opening duration, for which the metering valve is opened completely and which is fixed in such a way that a spray mist is always produced during the metering. The procedure according to this invention prevents the reagent from crystallizing and, as a result, firstly ensures exact metering of the reagent and secondly counteracts clogging of the metering valve, in particular if a urea/water solution is provided as preliminary stage of the reagent.