Abstract: An apparatus includes a plurality of DC buses and a plurality of inverter circuits, respective ones of which are coupled to respective ones of the plurality of DC buses. The apparatus further includes a control circuit configured to generate a representative DC voltage signal based on DC voltage signals for respective ones of the DC buses, to generate a first modulation control signal from the representative DC voltage signal, to generate second modulation control signals for the respective inverter circuits from the representative DC voltage signal and the first modulation control signal that are normalized based on the DC voltage signals for the buses and the representative DC voltage signal, and to modulate the inverter circuits responsive to respective ones of the second modulation control signals. The representative DC voltage signal may represent a maximum of the DC voltages for the respective DC buses.

Abstract: A converter of a variable frequency drive (VFD) is operated in a ramp-up mode to produce an AC output voltage for accelerating a motor. A loading of the converter is determined concurrent with the ramp-up mode. Transfer of the motor to a bypassed mode is conditioned on whether the determined loading in the ramp-up mode meets a criterion. In some embodiments, conditioning transfer to the bypassed mode comprises foregoing transition to the bypassed mode based on a comparison of the determined loading to an underloading threshold.

Abstract: An apparatus includes a magnetometer-based current sensor (e.g., a Hall-effect or fluxgate-based current sensor) configured to sense a magnetic field generated by a current in at least one conductor connecting a motor drive output to a motor and to responsively produce a first current sense signal and a magnetometer-based voltage sensor (e.g., a Hall-effect or fluxgate-based voltage sensor) configured to sense a magnetic field generated in response to a voltage of the at least one conductor and to responsively produce a first voltage sense signal. The apparatus further includes a signal conversion circuit configured to receive the first current sense signal and the first voltage sense signal and to generate a second current sense input and a second voltage sense input for provision to a current sense input and a voltage sense input, respectively, of a motor protection relay that protects the motor.

Abstract: A motor starter apparatus includes an enclosure, a bypass contactor configured to be installed in the enclosure and configured to selectively couple a power source to a motor, and a reduced voltage soft starter (RVSS) circuit assembly (e.g. a wheeled truck) configured to be installed in the enclosure, to be coupled to the power source and to apply a variable voltage to the motor. The bypass contactor is configured to preserve a connection of the bypass contactor to the power source and the motor when the RVSS circuit assembly is removed from the enclosure.

Abstract: A motor starter apparatus includes an enclosure, a bypass contactor configured to be installed in the enclosure and configured to selectively couple a power source to a motor, and a reduced voltage soft starter (RVSS) circuit assembly (e.g. a wheeled truck) configured to be installed in the enclosure, to be coupled to the power source and to apply a variable voltage to the motor. The bypass contactor is configured to preserve a connection of the bypass contactor to the power source and the motor when the RVSS circuit assembly is removed from the enclosure.

Abstract: A motor starter includes a plurality of semiconductor switches configured to couple respective phases of an AC power source to respective phases of a motor and a control circuit configured to configured to selectively operate the semiconductor switches to gradually increase a voltage applied to the motor, to determine root mean square (RMS) current values of a current of the motor as the voltage increases, and to cause the semiconductor switches to apply a full voltage or a more steeply ramping voltage to the motor responsive to the RMS current values meeting a criterion.

Abstract: A method for averaging pulsating measurement quantities is disclosed. First, time-discrete measurement values (1) of the measurement quantity are recorded. Subsequently, first filtering of the measurement values (1) is carried out with a first filter time constant, during which a first signal (2) is obtained, and second filtering of the measurement values (1) with a second filter time constant, during which a second signal (3) is obtained, the second filter time constant being greater than the first filter time constant. Intersection points (4), at which the first signal (2) and the second signal (3) intersect, are then determined. Lastly, the arithmetic mean of the measurement values (1) between the intersection points (4) is taken.

Abstract: A method for monitoring the volumetric flow of a metering valve (131) of a fluidic metering system (100) of an internal combustion engine, in which at least one feed pump (111) for feeding a fluid is arranged, the feed pump (111) being connected to a feed line (207) and to a return line (160), and it being provided in particular that an inner leakage of the feed pump (111) is determined and that the volumetric flow of the metering valve (131) is monitored on the basis of ascertained (320, 325) pressure values on the basis of the determined inner leakage of the feed pump (350).

Abstract: An apparatus includes a magnetometer-based current sensor (e.g., a Hall-effect or fluxgate-based current sensor) configured to sense a magnetic field generated by a current in at least one conductor connecting a motor drive output to a motor and to responsively produce a first current sense signal and a magnetometer-based voltage sensor (e.g., a Hall-effect or fluxgate-based voltage sensor) configured to sense a magnetic field generated in response to a voltage of the at least one conductor and to responsively produce a first voltage sense signal. The apparatus further includes a signal conversion circuit configured to receive the first current sense signal and the first voltage sense signal and to generate a second current sense input and a second voltage sense input for provision to a current sense input and a voltage sense input, respectively, of a motor protection relay that protects the motor.

Abstract: A method for detecting a dosing error of a reduction agent in a dosing module of an SCR catalytic converter system. The SCR catalytic converter system comprises the dosing module, which has a dosing valve and a flow valve as well as a delivery module with delivery pump. The SCR catalytic converter system, furthermore, has a return, in which a further flow valve is arranged. Said flow valve changes an effective cross-sectional area of the return. The method herein comprises the following steps: at the beginning, the dosing valve is closed (200). At a first pressure value (p1) in the system the delivery pump is switched off (201) and a measurement (202) of a first pressure rate (?RLdynamic) of the flow valve of the return subsequently takes place. Additional operation of the pump and the dosing valve occurs and a ratio of pressure rates is determined.

Abstract: The invention relates to an expansion body having an equalization chamber, which is separated by an elastic diaphragm from a fluid which flows through part of the expansion body. A mechanical spring applies an additional spring force to the diaphragm, wherein the spring has mechanical prestress. In addition, the invention relates to an SCR system with such an expansion body, and a method for monitoring a pressure sensor in such a SCR system with an expansion body. The method comprises the following steps: first, an anticipated characteristic pressure at which the spring force of the spring of the expansion body is overcome is defined by setting the prestress of the spring in the expansion body.

Abstract: An electrical system (2) includes a transformer (16) coupled to an AC source (6) that provides a main AC voltage, the transformer having a number of sets of primary windings (18) and secondary windings (20), and a charging module (32) structured to generate a magnetizing AC voltage. The charging module is structured to selectively provide the magnetizing AC voltage to: (i) one of the number of sets primary windings, or (ii) one of the number of sets secondary windings. The magnetizing AC voltage is such that responsive to the magnetizing AC voltage being provided to one of the sets of primary windings or one of the sets of secondary windings, one or more of the sets of primary windings will be magnetized in a manner wherein a flux of the one or more of the number of primary windings is in phase with the main AC voltage provided from the AC source.

Abstract: A method for averaging pulsating measurement quantities is disclosed. First, time-discrete measurement values (1) of the measurement quantity are recorded. Subsequently, first filtering of the measurement values (1) is carried out with a first filter time constant, during which a first signal (2) is obtained, and second filtering of the measurement values (1) with a second filter time constant, during which a second signal (3) is obtained, the second filter time constant being greater than the first filter time constant. Intersection points (4), at which the first signal (2) and the second signal (3) intersect, are then determined. Lastly, the arithmetic mean of the measurement values (1) between the intersection points (4) is taken.

Abstract: A switchgear unit includes an enclosure having a first compartment and a second compartment and a fuse assembly mounted on a wall that separates the first compartment and the second compartment, the fuse assembly comprising a fuse housing disposed in the second compartment and accessible from the first compartment via an opening in the wall. The fuse assembly may include a cover configured to separate a fuse in the fuse housing from the first compartment and that is removable to provide access to the fuse from the first compartment. The fuse assembly may further include a power input terminal supported by the fuse housing and accessible from the second compartment and a switch disposed in the first compartment and configured to electrically connect the power input terminal to the first fuse connection terminal.

Abstract: A method for monitoring the volumetric flow of a metering valve (131) of a fluidic metering system (100) of an internal combustion engine, in which at least one feed pump (111) for feeding a fluid is arranged, the feed pump (111) being connected to a feed line (207) and to a return line (160), and it being provided in particular that an inner leakage of the feed pump (111) is determined and that the volumetric flow of the metering valve (131) is monitored on the basis of ascertained (320, 325) pressure values on the basis of the determined inner leakage of the feed pump (350).

Abstract: The invention relates to an expansion body having an equalization chamber, which is separated by an elastic diaphragm from a fluid which flows through part of the expansion body. A mechanical spring applies an additional spring force to the diaphragm, wherein the spring has mechanical prestress. In addition, the invention relates to an SCR system with such an expansion body, and a method for monitoring a pressure sensor in such a SCR system with an expansion body. The method comprises the following steps: first, an anticipated characteristic pressure at which the spring force of the spring of the expansion body is overcome is defined by setting the prestress of the spring in the expansion body.

Abstract: A method is provided for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, comprising the following steps: acquiring and temporarily storing sensor values at a predefined sampling interval during a segment duration of the state variable, the segment duration corresponding to one period of a pulsation of the state variable; determining an average of the sensor values acquired within the segment duration; correcting the average of the sensor values that has been determined, using a correction variable that depends on the time difference between the segment duration and a multiple of the sampling interval.

Abstract: A method for detecting a dosing error of a reduction agent in a dosing module of an SCR catalytic converter system. The SCR catalytic converter system comprises the dosing module, which has a dosing valve and a flow valve as well as a delivery module with delivery pump. The SCR catalytic converter system, furthermore, has a return, in which a further flow valve is arranged. Said flow valve changes an effective cross-sectional area of the return. The method herein comprises the following steps: at the beginning, the dosing valve is closed (200). At a first pressure value (p1) in the system the delivery pump is switched off (201) and a measurement (202) of a first pressure rate (?RLdynamic) of the flow valve of the return subsequently takes place. Additional operation of the pump and the dosing valve occurs and a ratio of pressure rates is determined.

Abstract: An electrical system (2) includes a transformer (16) coupled to an AC source (6) that provides a main AC voltage, the transformer having a number of sets of primary windings (18) and secondary windings (20), and a charging module (32) structured to generate a magnetizing AC voltage. The charging module is structured to selectively provide the magnetizing AC voltage to: (i) one of the number of sets primary windings, or (ii) one of the number of sets secondary windings. The magnetizing AC voltage is such that responsive to the magnetizing AC voltage being provided to one of the sets of primary windings or one of the sets of secondary windings, one or more of the sets of primary windings will be magnetized in a manner wherein a flux of the one or more of the number of primary windings is in phase with the main AC voltage provided from the AC source.

Abstract: A method for recognizing an error in the acquisition of a pulsing sensor quantity of a sensor in a gas line system of an internal combustion engine includes: acquisition of a plurality of sensor values of the pulsing sensor quantity that represent a curve of the sensor quantity; determination of a deviation value that indicates a measure of a deviation of the pulsing sensor values from a mean value of the sensor quantity; and recognition of an error of the sensor as a function of the deviation value.