Abstract: The present invention relates to a double analysis of signals emitted by a rotational angle sensor. For this purpose, the signal emitted by the rotational angle sensor is processed in a first signal path with respect to a maximum angle quality of the angle signal to be calculated. A second signal path for processing the signal emitted by the rotational angle sensor is optimized to indicate a maximum diagnosability of errors.

Abstract: The present invention provides an apparatus and a method for checking the plausibility of an excitation signal.

Abstract: The invention relates to a device and a method for testing the plausibility of signals of a rotary encoder.

Abstract: The present invention provides a control circuit (10; 110; 210; 310) and a method for checking the plausibility of a rotor position angle. The control circuit is designed with: a rotor position angle determination device (12) for determining a first rotor position angle, ?(tk), at a first time, tk, and at least one second rotor position angle, ?(tk?1), at a second time, ?k?1, before the first time, tk; a computing device (14; 114; 214; 314) for determining a rotor position angle, mod(tk), to be expected at the first time, tk, from a computational model of the computing device (14; 114; 214; 314) using at least the second rotor position angle, ?(tk?1); and a plausibility-checking device (16) for outputting a signal (51) which indicates the determined first rotor position angle, ?(tk), as plausible if an amount of a difference between the rotor position angle, mod(tk), to be expected and the determined first rotor position angle, ?(tk), does not exceed a predetermined threshold value.

Abstract: A method for detecting an open line (10) of a receiver coil (17; 18) of a resolver (16) comprises—providing a pull-up resistor (R1; R3) and a pull-down resistor (R2; R4) at the terminals (7a, 7b; 8a, 8b) on a control device (1) for the signal lines (13a, 13b; 14a, 14b) of the receiver coil (17; 18);—measuring the voltage between the two signal line terminals (7a, 7b; 8a, 8b) of the receiver coil at two sampling times provided symmetrically at the middle of the excitation period;—calculating an offset value by calculating an average value that comprises the measured values measured at the two sampling times in an excitation period; and—identifying an open line (10) if the offset value exceeds a threshold value.

Abstract: The present invention relates to the determining of a sensor signal. For example, an enveloping waveform of the signal from a rotational angle sensor can be reconstructed for this purpose. To this end, a predefined number of successively sampled values of a signal from a rotational angle sensor are multiplied with the elements of a weighting vector. On the basis of a measurement vector weighted in this way, an enveloping waveform of a signal curve from a rotational angle sensor can then be determined and, therefrom, a phase angle can be calculated.

Abstract: A method for detecting an open resolver exciter line (10) comprises the following steps: —measuring the signal voltages Us and Uc of the sine coil (17) and the cosine coil (18) of the resolver (15); —comparing the amplitude Us2+Uc2 of the resolver signal to a first threshold value CS1; —starting a diagnostic mode having the following steps if the amplitude Us2+Uc2 does not reach the first threshold value CS1; —applying a constant voltage to the exciter line (11, 12) via a series resistance (25) RLE that is large compared to the ohmic resistance of the exciter coil (16) RE; —measuring the voltage difference UE(t1) at the terminals (5, 6) of the exciter line at a number of points in time ti during at least one excitation period; and —determining the DC voltage component UE,Offs of the voltage difference UE; —determining that there is an open exciter line (10) if, during the excitation period, the DC voltage component UE,Offs is larger than a second threshold value CS2.

Abstract: A method for detecting a short circuit to ground or to the operating voltage of a signal line (11, 12) of a resolver (16) has the following steps: —measuring the potential of the signal lines (13a, 13b; 14a, 14b) of the receiver coil (18) with respect to ground at two sampling times (R and F) provided symmetrically at the middle of the excitation period; —calculating an offset value for a signal line pair (13a, 13b; 14a, 14b) by calculating the average value of the four measured values (UHR, ULR, UHF and ULF) for the associated receiver coil (17, 18); and —identifying a short circuit and the potential to which the short-circuited line is connected in that the offset value is compared to threshold values.

Abstract: The invention provides a control circuit and a method for qualifying a fault for a synchronous machine.

Abstract: The invention provides a method, an apparatus and a system 1 for operating a rotating electric machine.

Abstract: A method for detecting a short circuit (10) of a resolver exciter line (11, 12) comprising the steps of: measuring (31) the excitation voltage (U(ti) for the resolver (16) at a number of points in time during each excitation period; determining (32) the amplitude of the excitation voltage; starting a diagnostic mode (33) having the following steps (34 bis 37) if the amplitude of the excitation voltage does not reach a first threshold value; retrieving (34) the time-dependent voltage curves UH (ti) of the first and the second exciter line (H; 11) with respect to ground at the number of points in time; calculating (35) the amplitudes and the offset values of the time-dependent voltage curves; identifying (36) the exciter line that has a short circuit by determining that the calculated amplitudes do not exceed a second threshold value; identifying (37) the potential to which the short-circuited line (H or L) can be connected by comparing the offset values to third threshold values.

Abstract: The present invention relates to the signal processing of signals with the simultaneous conversion of the operating time grid. To this end, a signal is detected or provided in a first time grid. After the difference quotient is calculated in the first time grid, the difference quotient is output in a second time grid in which the signal, in particular the difference quotient, is further processed.

Abstract: The invention relates to a fuel cell arrangement (1) having at least one fuel cell (2) with a cathode (3) and an anode. The cathode (3) and the anode each have a reactant feed (4) and a reactant discharge (5), a humidifying device (10) and sensors (12, 13, 14) being provided at least at one of the reactant feeds (4). In particular, the sensors (12, 13, 14) are at least one fluid mass sensor (12) and two pressure sensors (13, 14), the fluid mass sensor (12) and one of the pressure sensors (13) being arranged upstream of the humidifying device (10) and one of the pressure sensors (14) being arranged downstream of the humidifying device (10). The humidifying device (10) can be operated in a controlled manner on the basis of the measurements of the sensors (12, 13, 14). The invention further relates to a method for controlling the humidity of a reactant for such a fuel cell arrangement (1).

Abstract: The present invention relates to the determining of a sensor signal. For example, an enveloping waveform of the signal from a rotational angle sensor can be reconstructed for this purpose. To this end, a predefined number of successively sampled values of a signal from a rotational angle sensor are multiplied with the elements of a weighting vector. On the basis of a measurement vector weighted in this way, an enveloping waveform of a signal curve from a rotational angle sensor can then be determined and, therefrom, a phase angle can be calculated.

Abstract: The present invention provides a control circuit (10; 110; 210; 310) and a method for checking the plausibility of a rotor position angle. The control circuit is designed with: a rotor position angle determination device (12) for determining a first rotor position angle, ?(tk), at a first time, tk, and at least one second rotor position angle, ?(tk?1), at a second time, ?k?1, before the first time, tk; a computing device (14; 114; 214; 314) for determining a rotor position angle, mod(tk), to be expected at the first time, tk, from a computational model of the computing device (14; 114; 214; 314) using at least the second rotor position angle, ?(tk?1); and a plausibility-checking device (16) for outputting a signal (51) which indicates the determined first rotor position angle, ?(tk), as plausible if an amount of a difference between the rotor position angle, mod(tk), to be expected and the determined first rotor position angle, ?(tk), does not exceed a predetermined threshold value.

Abstract: A method for detecting a short circuit (10) of a resolver exciter line (11, 12) comprising the steps of: •measuring (31) the excitation voltage (U(ti) for the resolver (16) at a number of points in time during each excitation period; •determining (32) the amplitude of the excitation voltage; •starting a diagnostic mode (33) having the following steps (34 bis 37) if the amplitude of the excitation voltage does not reach a first threshold value; •retrieving (34) the time-dependent voltage curves UH(ti) of the first and the second exciter line (H; 11) with respect to ground at the number of points in time; •calculating (35) the amplitudes and the offset values of the time-dependent voltage curves; •identifying (36) the exciter line that has a short circuit by determining that the calculated amplitudes do not exceed a second threshold value; •identifying (37) the potential to which the short-circuited line (H or L) can be connected by comparing the offset values to third threshold values.

Abstract: The present invention relates to a double analysis of signals emitted by a rotational angle sensor. For this purpose, the signal emitted by the rotational angle sensor is processed in a first signal path with respect to a maximum angle quality of the angle signal to be calculated. A second signal path for processing the signal emitted by the rotational angle sensor is optimized to indicate a maximum diagnosability of errors.

Abstract: The present invention provides an apparatus and a method for checking the plausibility of an excitation signal.

Abstract: A method for detecting an open resolver exciter line (10) comprises the following steps:—measuring the signal voltages Us and Uc of the sine coil (17) and the cosine coil (18) of the resolver (15);—comparing the amplitude Us2+Uc2 of the resolver signal to a first threshold value CS1;—starting a diagnostic mode having the following steps if the amplitude Us2+Uc2 does not reach the first threshold value CS1;—applying a constant voltage to the exciter line (11, 12) via a series resistance (25) RLE that is large compared to the ohmic resistance of the exciter coil (16) RE;—measuring the voltage difference UE(t1) at the terminals (5, 6) of the exciter line at a number of points in time ti during at least one excitation period; and—determining the DC voltage component UE,Offs of the voltage difference UE;—determining that there is an open exciter line (10) if, during the excitation period, the DC voltage component UE,Offs is larger than a second threshold value CS2.

Abstract: The invention relates to a device and a method for testing the plausibility of signals of a rotary encoder.