JP2008122216A - R / D conversion function abnormality detection device - Google Patents

Abstract

In a conventional abnormality detection device, even if data completely different from an input angle is output due to an abnormality in a digital data output circuit of an R / D converter, this cannot be detected.
An abnormality detection function 31 compares a resolver signal 1a (sin phase signal and cos phase signal) with an excitation signal 20a, and detects resolver quadrant information indicating a quadrant of an input shaft angle from the comparison result. Further, the abnormality detection function 31 detects R / D conversion function quadrant information indicating a quadrant of the input shaft angle from the digital angle signal 20b, and whether the R / D conversion function quadrant information is deviated from the resolver quadrant information by two quadrants. When it is determined that the two quadrants are shifted, an abnormality detection signal 31a indicating an abnormality of the R / D conversion function 20 is output.
[Selection] Figure 1

Description

  The present invention provides an R / D conversion function (resolver / digital conversion) that converts a sin phase signal and a cos phase signal (resolver signal) from a resolver, in which an excitation signal having a predetermined frequency is modulated according to an input shaft angle, into a digital angle signal. In particular, from the resolver quadrant information detected by comparing the sin phase signal and the cos phase signal from the resolver with the excitation signal, and the digital angle signal that is the output of the R / D conversion function. The present invention relates to a novel improvement for making it possible to more reliably detect an abnormality in the R / D converter by comparing the detected quadrant information with the R / D conversion function.

  As this type of anomaly detection device for this type of R / D conversion function, for example, the one disclosed in Patent Document 1 is used. A general configuration of such an abnormality detection apparatus for the R / D conversion function can be shown as shown in FIG.

  That is, the R / D converter 2 is connected to the resolver 1. The R / D converter 2 is provided with an R / D conversion function 20 and an abnormality detection function 21. That is, in this example, the abnormality detection device (abnormality detection function 21) is incorporated in the R / D converter. The R / D conversion function 20 inputs an excitation signal 20 a (sin ωt) to the resolver 1. The resolver 1 outputs the resolver signal 1a (sin phase signal: sin θ · sin ωt, cos phase signal: cos θ · sin ωt) by modulating the excitation signal 20a according to the input shaft angle (θ). The excitation signal 20a, the sin phase signal, and the cos phase signal can be shown as shown in FIG. The R / D conversion function 20 converts the resolver signal 1a from the resolver 1 into a digital angle signal 20b. The anomaly detection function 21 receives a resolver signal 1a from the resolver 1 and state information 20c from the R / D conversion function 20. The abnormality detection function 21 is based on the principle that the sum of the squares of sin and cos is constant in order to detect that an abnormality has occurred in the resolver signal 1a due to a rare short of the resolver 1 or the like. The normality and the abnormality of the relative balance of the resolver signal 1a are detected by using the sum method or the amplitude comparison method based on the fact that the amplitudes of sin and cos are not lower than a predetermined level at the same time. In addition, the abnormality detection function 21 detects a malfunction of the R / D conversion function 20, and in the negative feedback control method (closed loop method) represented by the tracking method, the control deviation is basically zero when normal. By utilizing this fact, it is monitored based on the state information 20c whether or not the control deviation exceeds a predetermined level. The abnormality detection function 21 outputs an abnormality detection signal 21a when any abnormality is detected.

JP 2005-345189 A

Since the conventional apparatus is configured as described above, the following problems exist.
That is,
1) Since the conventional device does not compare the resolver signal 1a with the digital angle signal 20b, even if data different from the input angle is output due to an abnormality in the digital data output circuit of the R / D converter. This is not detectable (typically, a free run in which the digital angle signal 20b is output even though no signal is output from the resolver, or 180 ° inversion of the digital angle signal based on the principle of R / D conversion. Cannot be detected).
2) When the R / D converter having a feedback system makes an abnormality determination based on the magnitude of the control deviation, the abnormality from the control deviation value zero to the threshold value cannot be detected.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an abnormality detection device for an R / D conversion function that can detect an abnormality of the R / D conversion function more reliably. It is.

  The R / D conversion function abnormality detection device according to the present invention compares a sin phase signal and a cos phase signal with an excitation signal, and detects resolver quadrant information indicating a quadrant of an input shaft angle from the comparison result. Detection means and R / D conversion function quadrant information indicating a quadrant of the input shaft angle from the digital angle signal, and whether or not the R / D conversion function quadrant information is deviated by two quadrants from the resolver quadrant information And an abnormality detection means for outputting an abnormality detection signal indicating an abnormality of the R / D conversion function when it is determined that the two quadrants are shifted.

  Further, the input signal quadrant detection means performs XOR between a comparator unit that converts the sin phase signal, the cos phase signal, and the excitation signal into a binary digital signal, and the digital signal of the excitation signal and the digital signal of the sin phase signal. Thus, the sine-phase XOR circuit that detects sin-phase quadrant information and the cos-phase XOR circuit that detects cos-phase quadrant information by taking the XOR of the digital signal of the excitation signal and the digital signal of the cos-phase signal.

  Also, a sin phase latch unit that latches sin phase quadrant information detected by the sin phase XOR circuit, a cos phase latch unit that latches cos phase quadrant information detected by the cos phase XOR circuit, and the phase of the excitation signal is 90. It comprises an integrator or differentiator that generates a timing generation signal by shifting it, and a comparator that generates a latch timing signal by converting the timing generation signal into a digital signal, and latches each phase by the latch timing signal. And a latch timing signal input unit for controlling the latch timing of the unit.

  Further, an input filter is further provided that is interposed between each phase XOR circuit and the abnormality detection means and invalidates each phase quadrant information from each phase XOR circuit that has changed in a time shorter than a predetermined time.

  An output filter that is connected to the output side of the abnormality detection means and invalidates the abnormality detection signal that has changed in a time shorter than a predetermined time is further provided.

  According to the abnormality detection device for the R / D conversion function of the present invention, the abnormality detection means determines whether or not the R / D conversion function quadrant information is deviated by two quadrants from the resolver quadrant information. When the determination is made, the abnormality of the R / D conversion function is detected, so that it is possible to detect that data completely different from the input angle is output, and it is possible to detect the abnormality of the R / D conversion function more reliably.

  Further, the input signal quadrant detection means performs XOR between a comparator unit that converts the sin phase signal, the cos phase signal, and the excitation signal into a binary digital signal, and the digital signal of the excitation signal and the digital signal of the sin phase signal. Thus, it comprises a sin phase XOR circuit that detects sin phase quadrant information and a cos phase XOR circuit that detects cos phase quadrant information by taking the XOR of the digital signal of the excitation signal and the digital signal of the cos phase signal. Resolver quadrant information can be detected more reliably, and abnormality of the R / D conversion function can be detected more reliably.

  In addition, the latch timing signal input unit generates a latch timing signal from the timing generation signal whose phase of the excitation signal is shifted by 90 °, and controls the latch timing of each phase latch unit by the latch timing signal. Thus, the possibility of determining a quadrant shift with each phase quadrant information reversed by the above can be reduced, and the reliability of abnormality detection can be improved.

  Further, the input filter invalidates each phase quadrant information from each phase XOR circuit that has changed in a time shorter than a predetermined time, so it is possible to determine a quadrant shift based on each phase quadrant information inverted by the phase shift. The reliability of abnormality detection can be improved.

  In addition, the output filter invalidates the abnormality detection signal that has changed in a time shorter than the predetermined time, and therefore invalidates the abnormality detection signal when the quadrant deviation is determined using each phase quadrant information inverted by the phase deviation. This can improve the reliability of abnormality detection.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing an abnormality detection device for an R / D conversion function according to Embodiment 1 of the present invention. The same or equivalent parts as those of the conventional R / D conversion function abnormality detection apparatus will be described using the same reference numerals. An R / D converter 3 is connected to the resolver 1. The R / D converter 3 is provided with an R / D conversion function 20 and an abnormality detection function 31. That is, in this example, the abnormality detection device (abnormality detection function 31) is incorporated in the R / D converter 3. The R / D conversion function 20 inputs an excitation signal 20 a (sin ωt) to the resolver 1. The resolver 1 outputs the resolver signal 1a (sin phase signal: sin θ · sin ωt, cos phase signal: cos θ · sin ωt) by modulating the excitation signal 20a according to the input shaft angle (θ). The excitation signal 20a and the resolver signal 1a can be shown as shown in FIG. The R / D conversion function 20 converts the resolver signal 1a from the resolver 1 into a digital angle signal 20b. The anomaly detection function 31 receives the resolver signal 1a from the resolver 1, and the digital angle signal 20b and state information 20c from the R / D conversion function 20. The abnormality detection function 31 performs abnormality detection based on the resolver signal 1a, the excitation signal 20a, and the digital angle signal 20b in addition to the abnormality detection similar to the conventional abnormality detection function 21.

  Next, FIG. 2 is a block diagram showing the abnormality detection function 31 of FIG. FIG. 2 shows only the configuration related to the abnormality detection based on the resolver signal 1a (sin phase signal 1b and cos phase signal 1c), the excitation signal 20a, and the digital angle signal 20b. In the figure, the abnormality detection function 31 is provided with an input signal quadrant detection unit 100, a sin phase latch unit 210 and a cos phase latch unit 220, a latch timing signal input unit 300, and an abnormality detection unit 400.

  The input signal quadrant detection means 100 compares the sin phase signal 1b and the cos phase signal 1c with the excitation signal 20a, and detects resolver quadrant information indicating the quadrant of the input shaft angle (θ) from the comparison result. Specifically, the input signal quadrant detection means 100 includes a comparator unit 110, a sin phase XOR circuit 120, and a cos phase XOR circuit 130. The comparator unit 110 converts the sin phase signal 1b, the cos phase signal 1c, and the excitation signal 20a into digital signals 110a to 110c. Although the digital signals 110a to 110c will be described later with reference to the drawings, 2 indicates 1 (high level) when the signals 1b, 1c, and 20a are positive, and 0 (low level) when they are negative. Value signal. The sin phase XOR circuit 120 detects the sin phase quadrant information 120a by taking an XOR (exclusive OR) of the digital signal 110a of the excitation signal 20a and the digital signal 110b of the sin phase signal 1b. The cos phase XOR circuit 130 detects the cos phase quadrant information 130a by XORing the digital signal 110a of the excitation signal 20a and the digital signal 110c of the cos phase signal 1c. Specific operations of the comparator unit 110, the sin phase XOR circuit 120, and the cos phase XOR circuit 130 will be described later with reference to a timing chart. The resolver quadrant information is a combination of sin phase quadrant information 120a and cos phase quadrant information 130a. The sin phase latch unit 210 latches (stores) the sin phase quadrant information 120 a detected by the sin phase XOR circuit 120. Similarly, the cos phase latch unit 220 latches the cos phase quadrant information 130 a detected by the cos phase XOR circuit 130.

  Here, the sin phase signal 1b, the cos phase signal 1c, and the excitation signal 20a are ideally in phase with each other. However, as will be described later with reference to the drawings, there is actually a phase shift between the sin phase signal 1b and the cos phase signal 1c and the excitation signal 20a. That is, in actuality, with respect to the excitation signal sin ωt, a sin phase signal: sin θ · sin (ωt + Δ) and a cos phase signal: cos θ · sin (ωt + Δ). Depending on the latch timing of each phase quadrant information by each phase latch unit 210, 220, the information inverted from the original information due to the phase shift of the sin phase signal 1b and the cos phase signal 1c with respect to the excitation signal 20a is latched. There is a case.

  The latch timing signal input unit 300 inputs a latch timing signal 300 a for controlling the latch timing of the phase latch units 210 and 220. Specifically, the latch timing signal input unit 300 includes an integrator 310 and a comparator 320. The integrator 310 shifts the phase of the excitation signal 20a input to the comparator 320 by 90 ° and outputs a timing generation signal 310a. The comparator 320 converts the timing generation signal 310a into a digital signal. The rising and falling edges of this digital signal become the latch timing signal 300a for the phase latch units 210 and 220. The phase latch units 210 and 220 latch the phase quadrant information 120a and 130a when the latch timing signal 300a is input.

  When the phase quadrant information 120a and 130a are stored in the phase latch units 210 and 220, the abnormality detection unit 400 performs R / D conversion on the R / D conversion function quadrant information indicating the quadrant of the input shaft angle (θ). It is detected from the digital angle signal 20b from the function 20. For example, when the digital angle signal 20b is a 12-bit signal and the upper 2 bits indicate the quadrant of the input shaft angle (θ), the abnormality detection unit 400 detects the upper 2 bits of the digital angle signal 20b. The abnormality detection unit 400 detects an abnormality of the R / D conversion function 20 when the detected R / D conversion function quadrant information is shifted by two quadrants from the resolver quadrant information latched in the respective phase latch units 210 and 220. .

  Next, the operation will be described. First, the operations of the input signal quadrant detection unit 100 and the abnormality detection unit 400 will be described, and then the operation of the latch timing signal input unit 300 will be described. FIG. 3 is a timing chart for explaining signal processing by the input signal quadrant detection unit 100 and the abnormality detection unit 400 of FIG. As shown in the figure, the sin phase signal 1b and the cos phase signal 1c are signals that are 90 ° out of phase with each other. In FIG. 3, unlike FIG. 9, the phase signals 1b and 1c are indicated by envelopes. The excitation signal 20a can be shown as a constant level signal as shown in the figure.

  The digital signal 110a of the excitation signal 20a converted by the comparator unit 110 is always 1 (high level) in the first to fourth quadrants. The first quadrant is an area greater than 0 ° and less than or equal to 90 °, the second quadrant is an area greater than 90 ° and less than or equal to 180 °, and the third quadrant is an area greater than 180 ° and less than or equal to 270 °. The fourth quadrant is an area greater than 270 ° and less than or equal to 360 °. The digital signal 110b of the sin phase signal 1b becomes 1 in the first and second quadrants and becomes 0 (low level) in the third and fourth quadrants. The digital signal 110c of the cos phase signal 1c is 1 in the first and fourth quadrants and is 0 in the second and third quadrants.

  Accordingly, the sin phase quadrant information 120a detected by the sin phase XOR circuit 120 is 0 in the first and second quadrants and 1 in the third and fourth quadrants. Similarly, cos phase quadrant information 130a detected by the cos phase XOR circuit 130 is 0 in the first and fourth quadrants and 1 in the second and third quadrants. The resolver quadrant information is a combination of sin phase quadrant information 120a and cos phase quadrant information 130a. In this embodiment, the resolver quadrant information is indicated by [sin phase quadrant information 120a, cos phase quadrant information 130a]. That is, the resolver quadrant information is [0, 0], [0, 1], [1, 1], and [1, 0] in the first to fourth quadrants.

  Depending on the principle and setting of the R / D conversion function 20, in this embodiment, the normal R / D conversion function quadrant information is [0, 0], [0, 1] in the first to fourth quadrants. Assume that [1, 0] and [1, 1]. The abnormality detection means 400 determines whether or not the R / D conversion function quadrant information is shifted by two quadrants from the resolver quadrant information, and outputs an abnormality detection signal 31a when it is determined that the quadrant is shifted by two (for example, resolver). When [0, 0] is latched as the quadrant information, [1, 0] is selected as the R / D conversion function quadrant information at the time of abnormality, and the R / D conversion function quadrant information detected from the digital angle signal 20b is selected. Is determined to be [1, 0]). The reason why the deviation threshold for detecting an abnormality is set to two quadrants is because an error in R / D conversion is taken into consideration. In the case of an input angle near the boundary of each quadrant due to an error of the digital angle 20b, the quadrant of the digital angle 20b may be shifted by one quadrant with respect to the input angle (for example, when the input angle is 179 °, When the angle 20b is output as 181 °, the resolver signal 1a is in the second quadrant, but the digital angle 20b is in the third quadrant). That is, the deviation of one quadrant is an error range.

  Next, FIG. 4 is an explanatory diagram showing a state when the sin phase signal 1b of FIG. 2 is delayed from the excitation signal 20a. As shown in FIG. 9, the sin phase signal 1 b is a signal obtained by modulating the excitation signal 20 a by the resolver 1 based on the input shaft angle (θ). As shown in FIG. 4, a phase shift A occurs between the sin phase signal 1b and the excitation signal 20a. In the sin phase quadrant information 120a, inversion of information due to the phase shift A occurs. This inverted information causes erroneous abnormality detection. Therefore, it is necessary to control the latch timing of the sin phase quadrant information 120a by the sin phase latch unit 210 so that the information inverted by the phase shift A is not latched.

  The integrator 310 shifts the phase of the excitation signal 20a input to the comparator 320 by 90 ° and outputs a timing generation signal 310a. The comparator 320 converts the timing generation signal 310a into a digital signal. The rising and falling edges of this digital signal become the latch timing signal 300a for the phase latch units 210 and 220. This allows a phase shift of ± 90 °.

  Next, FIG. 5 is an explanatory diagram showing a state when the sin phase signal 1b of FIG. 2 is ahead of the excitation signal 20a. As shown in the figure, inversion of information due to phase shift A occurs in the sin phase quadrant information 120a even when the sin phase signal 1b is ahead of the excitation signal 20a. Even in such a case, the latch of the inverted sin phase quadrant information 120a can be prevented by inputting the latch timing signal 300a. The same applies to the cos phase signal 1c.

  In such an abnormality detection device of the R / D conversion function 20, the abnormality detection means 400 detects R / D conversion function quadrant information indicating the quadrant of the input shaft angle θ from the digital angle signal 20b and also performs R / D conversion. Since it is determined whether or not the functional quadrant information is shifted by two quadrants from the resolver quadrant information, and when it is determined that the quadrant is shifted, an abnormality detection signal 31a indicating an abnormality of the R / D conversion function 20 is output. It is possible to detect the output of completely different data, and to detect the abnormality of the R / D conversion function 20 more reliably.

  Further, the input signal quadrant detection means 100 includes a comparator unit 110 that converts the sin phase signal 1b, the cos phase signal 1c, and the excitation signal 20a into binary digital signals 110a to 110c, an excitation signal digital signal 110a, and a sin phase. The XOR of the sin phase quadrant information 120a by taking the XOR with the digital signal 110b of the signal, and the cos phase by taking the XOR of the digital signal 110a of the excitation signal and the digital signal 110c of the cos phase signal Since it comprises the cos phase XOR circuit 130 for detecting the quadrant information 130a, the resolver quadrant information can be detected more reliably, and the abnormality of the R / D conversion function 20 can be detected more reliably.

  The latch timing signal input unit 300 generates the latch timing signal 300a from the timing generation signal 310a in which the phase of the excitation signal 20a is shifted by 90 °, and the latch timing signal 300a latches the phase latch units 210 and 220. Since the timing is controlled, it is possible to reduce the possibility that the quadrant shift is determined based on the phase quadrant information 120a and 130a inverted by the phase shift A, and it is possible to improve the reliability of abnormality detection.

  In the first embodiment, it has been described that the integrator 310 generates the timing generation signal 310a by shifting the phase of the excitation signal 20a by 90 °. However, the timing generation signal 310a is generated by a differentiator instead of the integrator 310. It may be generated.

Embodiment 2. FIG.
FIG. 6 is a configuration diagram showing the abnormality detection function 41 of the R / D conversion function 20 according to the second embodiment of the present invention. In the figure, an input filter 500 is interposed between each phase XOR circuit 120, 130 and the abnormality detection means 400. The input filter 500 invalidates the phase quadrant information 120a and 130a from the phase XOR circuits 120 and 130 that have changed in a time shorter than a predetermined time. In other words, each input filter 500 invalidates the respective quadrant information 120a and 130a that has been inverted by the phase shift A. This is a countermeasure utilizing the fact that the time during which the phase quadrant information 120a, 130a is inverted due to the phase shift A is shorter than the time when it is not inverted. That is, each input filter 500 is a substitute for the latch timing signal input unit 300 and the phase touch units 210 and 220 of the first embodiment. Other configurations are the same as those in the first embodiment.

  In such an abnormality detection device of the R / D conversion function 20, the input filter 500 invalidates the phase quadrant information 120a and 130a from the phase XOR circuits 120 and 130 that have changed in a time shorter than a predetermined time. The possibility that the quadrant shift is determined by the phase quadrant information 120a and 130a inverted by the phase shift A can be reduced, and the reliability of abnormality detection can be improved.

Embodiment 3 FIG.
FIG. 7 is a configuration diagram showing an abnormality detection function 51 of the R / D conversion function 20 according to the third embodiment of the present invention. In the figure, an output filter 600 is connected to the output side of the abnormality detection means 400. The output filter 600 invalidates the abnormality detection signal 31a that has changed in a time shorter than the predetermined time. In other words, the output filter 600 invalidates the abnormality detection signal 31a when the quadrant shift is determined using the phase quadrant information 120a and 130a inverted by the phase shift A. That is, the output filter 600 is a substitute for the input filter 500 of the second embodiment. Other configurations are the same as those of the second embodiment.

  In such an abnormality detection device of the R / D conversion function 20, the output filter 600 invalidates the abnormality detection signal 31a that has changed in a time shorter than the predetermined time, and thus each phase quadrant information 120a inverted by the phase shift A. , 130a can be used to invalidate the abnormality detection signal 31a when the quadrant shift is determined, and the reliability of abnormality detection can be improved.

  In the first to third embodiments, it has been described that only one of the latch timing signal input unit 300 and each phase touch unit 210 and 220, the input filter 500, and the output filter 600 is used. In order to improve the reliability of detection more reliably, any two and all three of the latch timing signal input unit 300, each phase touch unit 210, 220, the input filter 500, and the output filter 600 are provided. You may use simultaneously. That is, the abnormality detection functions 31, 41, 51 of the first to third embodiments can be combined.

  In the first to third embodiments, the abnormality detection functions 31, 41, and 51 have been described as being incorporated in the R / D converter 3, but even if they are provided outside the R / D converter 3. Good.

It is a block diagram which shows the abnormality detection apparatus of the R / D conversion function by Embodiment 1 of this invention. It is a block diagram which shows the abnormality detection function of FIG. It is a timing chart explaining the signal processing by the input signal quadrant detection means and the abnormality detection means of FIG. It is explanatory drawing which shows a state when the sin phase signal of FIG. 2 is behind the excitation signal. It is explanatory drawing which shows a state when the sin phase signal of FIG. 2 is ahead of the excitation signal. It is a block diagram which shows the abnormality detection function of the R / D conversion function by Embodiment 2 of this invention. It is a block diagram which shows the abnormality detection function of the R / D conversion function by Embodiment 3 of this invention. It is a block diagram which shows the abnormality detection apparatus of the conventional R / D conversion function. It is explanatory drawing which shows the waveform of an excitation signal, a sin phase signal, and a cos phase signal.

Explanation of symbols

  1 resolver, 1b sin phase signal, 1c cos phase signal, 20a excitation signal, 20b digital angle signal, 20 R / D conversion function, 31, 41, 51 abnormality detection function, 31a abnormality detection signal, 100 input signal quadrant detection means, 110 Comparator unit, 110a Excitation signal digital signal, 110b sin phase signal digital signal, 110c cos phase signal digital signal, 120 sin phase XOR circuit, 120a sin phase quadrant information, 130 cos phase XOR circuit, 130a cos phase quadrant information 210 sin phase latch unit, 220 cos phase latch unit, 300 latch timing signal input unit, 300a latch timing signal, 310a timing generation signal, 310 integrator, 320 comparator, 400 abnormality detection means, 500 input filter, 600 Output filter.

Claims (5)

The sin phase signal (1b) and the cos phase signal (1c) from the resolver (1) obtained by modulating the excitation signal (20a) having a predetermined frequency according to the input shaft angle (θ) are converted into a digital angle signal (20b). An abnormality detection device (31) of an R / D conversion function (20),
The sin phase signal (1b) and the cos phase signal (1c) are respectively compared with the excitation signal (20a), and resolver quadrant information indicating the quadrant of the input shaft angle (θ) is detected from the comparison result. Detection means (100);
Whether R / D conversion function quadrant information indicating a quadrant of the input shaft angle (θ) is detected from the digital angle signal (20b), and whether the R / D conversion function quadrant information is shifted by two quadrants from the resolver quadrant information. And an abnormality detection means (400) for outputting an abnormality detection signal (31a) indicating an abnormality of the R / D conversion function (20) when it is determined that the two quadrants are deviated. An abnormality detection device for an R / D conversion function. The resolver quadrant information is a combination of sin phase quadrant information (120a) and cos phase quadrant information (130a),
The input signal quadrant detection means (100) is a comparator unit that converts the sin phase signal (1b), the cos phase signal (1c), and the excitation signal (20a) into binary digital signals (110a to 110c). A sin-phase XOR circuit (120) for detecting the sin-phase quadrant information (120a) by taking an XOR of (110) and the digital signal (110a) of the excitation signal and the digital signal (110b) of the sin-phase signal And a cos phase XOR circuit (130) for detecting the cos phase quadrant information (130a) by taking the XOR of the excitation signal digital signal (110a) and the cos phase signal digital signal (110c). The abnormality detection device for an R / D conversion function according to claim 1. A sin phase latch unit (210) for latching sin phase quadrant information (120a) detected by the sin phase XOR circuit (120);
A cos phase latch unit (220) for latching cos phase quadrant information (130a) detected by the cos phase XOR circuit (130);
An integrator (310) or a differentiator that generates a timing generation signal (310a) by shifting the phase of the excitation signal (20a) by 90 °, and converting the timing generation signal (310a) into a digital signal. A latch timing signal input unit (300) that includes a comparator (320) that generates a latch timing signal (300a), and controls the latch timing of each phase latch unit (210, 220) by the latch timing signal (300a). The R / D conversion function abnormality detection device according to claim 2, further comprising:   Each phase quadrant from each phase XOR circuit (120, 130) interposed between each phase XOR circuit (120, 130) and the abnormality detection means (400) and changed in a time shorter than a predetermined time. The R / D conversion function abnormality detection device according to claim 2, further comprising an input filter (500) for invalidating the information (120a, 130a).   An output filter (600) connected to the output side of the abnormality detection means (400) and invalidating the abnormality detection signal (31a) changed in a time shorter than a predetermined time is further provided. Item 3. An abnormality detection device for an R / D conversion function according to Item 2.

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