Robert Boschgmbh

Benjamin Lechner

Daniel Raichle

Daniel Zirkel

Michael Ungermann

Edwin Eberlein

Michael Mueller

Tim Bruckhaus

Lei Chen

Miriam Riederer

Christoph Schuster

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.

Apparatuses and methods for evaluating a signal emitted by a rotational angle sensor

The present invention provides an apparatus and a method for checking the plausibility of an excitation signal. The apparatus is designed with: an input signal device () which is designed to provide an input signal () on the basis of the excitation signal (), the plausibility of which is to be checked; an amplitude estimation device () which is designed to determine an estimated amplitude value () for an amplitude of the excitation signal () on the basis of the input signal () provided; a phase angle estimation device () which is designed to determine an estimated phase angle value () for a phase angle of the excitation signal () on the basis of the input signal () provided; a diagnostic device () which is designed to generate a diagnostic signal () on the basis of at least the determined estimated amplitude value () and the determined estimated phase angle value (); and a plausibility-checking device () which is designed to check the plausibility of the excitation signal () on the basis of the diagnostic signal () depending on a predetermined range of values for the diagnostic signal ().

Apparatus and method for checking the plausibility of an excitation signal for a rotary encoder

The invention relates to a device and a method for testing the plausibility of signals of a rotary encoder. The device is formed with: a sine signal-providing device () designed to provide a sine signal () of the rotary encoder (); a cosine signal-providing device () designed to provide a cosine signal () of the rotary encoder (); a calculation device () designed to form a calculation signal () based on the sine signal () and the cosine signal (); a maximum value-determining device () designed to determine a maximum value of the calculation signal (); a minimum value-determining device () designed to determine a minimum value of the calculation signal (); a determining device () designed to determine a differential signal () as or based on a value of a difference between the determined maximum value and the determined minimum value, and which differential signal indicates an amplitude difference between an amplitude of the sine signal () and an amplitude of the cosine signal (); and a plausibility device () designed to test the plausibility of the sine signal () and the cosine signal (), in the event that the differential signal () falls within a predetermined region.

Device and method for testing the plausibility of signals of a rotary encoder

The present invention provides a control circuit () and a method for checking the plausibility of a rotor position angle. The control circuit is designed with: a rotor position angle determination device () for determining a first rotor position angle, &#x3c6;(t), at a first time, t, and at least one second rotor position angle, &#x3c6;(t), at a second time, &#x3c6;, before the first time, t; a computing device () for determining a rotor position angle,(t), to be expected at the first time, t, from a computational model of the computing device () using at least the second rotor position angle, &#x3c6;(t); and a plausibility-checking device () for outputting a signal () which indicates the determined first rotor position angle, &#x3c6;(t), as plausible if an amount of a difference between the rotor position angle,(t), to be expected and the determined first rotor position angle, &#x3c6;(t), does not exceed a predetermined threshold value.

Control circuit and method for checking the plausibility of a rotor position angle

A method for detecting an open line () of a receiver coil () of a resolver () comprises&#x2014;providing a pull-up resistor (R; R) and a pull-down resistor (R; R) at the terminals () on a control device () for the signal lines () of the receiver coil ();&#x2014;measuring the voltage between the two signal line terminals () of the receiver coil at two sampling times provided symmetrically at the middle of the excitation period;&#x2014;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&#x2014;identifying an open line () if the offset value exceeds a threshold value.

Method and circuit for detecting an open line of the sine/cosine receiver coil of a resolver

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.

Method and device for determining a sensor signal

A method for detecting a short circuit to ground or to the operating voltage of a signal line () of a resolver () has the following steps: &#x2014;measuring the potential of the signal lines () of the receiver coil () with respect to ground at two sampling times (R and F) provided symmetrically at the middle of the excitation period; &#x2014;calculating an offset value for a signal line pair () by calculating the average value of the four measured values (U, U, Uand U) for the associated receiver coil (); and &#x2014;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.

Method and circuit for detecting a short circuit of the sine or cosine receiver coil of a resolver

A method for detecting an open resolver exciter line () comprises the following steps: &#x2014;measuring the signal voltages Uand Uof the sine coil () and the cosine coil () of the resolver (); &#x2014;comparing the amplitude U+Uof the resolver signal to a first threshold value C; &#x2014;starting a diagnostic mode having the following steps if the amplitude U+Udoes not reach the first threshold value C; &#x2014;applying a constant voltage to the exciter line () via a series resistance () Rthat is large compared to the ohmic resistance of the exciter coil () R; &#x2014;measuring the voltage difference U(t) at the terminals () of the exciter line at a number of points in time tduring at least one excitation period; and &#x2014;determining the DC voltage component Uof the voltage difference U; &#x2014;determining that there is an open exciter line () if, during the excitation period, the DC voltage component Uis larger than a second threshold value C.

Method and circuit for detecting an open resolver exciter line

The invention provides a control circuit and a method for qualifying a fault for a synchronous machine. The control circuit () is designed with: a rotor position angle range determination device () which is designed to determine at least one rotor position angle range covered by a rotor of the synchronous machine; a diagnostic signal determination device () which is designed to determine at least one diagnostic signal value of a diagnostic signal which indicates a fault; a comparison device () which is designed to determine whether a predetermined diagnostic threshold () is exceeded by the at least one determined diagnostic signal value or a diagnostic signal value derived from the at least one diagnostic signal value; and a qualification device () which is designed to qualify the fault, which is indicated by the diagnostic signal, on the basis of the at least one covered rotor position angle range and the exceeding of the predetermined diagnostic threshold () by the diagnostic signal value or the derived diagnostic signal value.

Control circuit and method for qualifying a fault for a synchronous machine

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

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Neuhausen, Germany

Benjamin Lechner