JP2015184152A - Resolver disconnection detecting method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver disconnection detecting method and device capable of detecting disconnection of a resolver even during battery backup.SOLUTION: In the resolver disconnection detecting method and device of the present invention, when positive polarity pulses PP and negative polarity pulses NP are alternately input to an excitation terminal 1a of a resolver 1, a disconnection detecting unit 23 determines whether the combination of first and second polar signals 21a and 22a is continuously constant. When the combination of the first and second polar signals 21a and 22a is continuously constant, the disconnection detecting unit 23 determines that disconnection occurs in the resolver 1.

Description

  The present invention relates to a resolver disconnection detection method and apparatus for detecting resolver disconnection.

  As this type of resolver disconnection detection method that has been used in the past, for example, the method disclosed in the following Patent Document 1 can be cited. That is, in the conventional configuration, a voltage dividing circuit is connected to the output terminal of the resolver, and the output voltage of the voltage dividing circuit and the reference voltage are compared by an analog circuit to determine whether or not the resolver is broken. .

  Further, for example, as described in Patent Documents 2 and 3 below, when the power supply to the R / D converter is stopped, a pulse from a battery or the like is applied to the excitation terminal of the resolver in order to suppress power consumption. A signal is input to detect the angular position of the resolver rotor. Such detection of the angular position of the resolver rotor by the pulse signal is sometimes referred to as battery backup.

JP 2011-99842 A JP 2013-213796 A Japanese Patent Laid-Open No. 07-113658

  Since the configuration described in Patent Document 1 and the like determines whether or not the resolver is disconnected by an analog circuit, it is possible to detect a disconnection in the resolver when performing battery backup as in Patent Documents 2 and 3 or the like. Can not.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a resolver disconnection detection method and apparatus capable of detecting resolver disconnection even during battery backup.

  According to the resolver disconnection detecting method of the present invention, when the resolver rotor is rotating, the positive polarity pulse and the negative polarity pulse are alternately inputted to the excitation terminal of the resolver at predetermined time intervals, and the first output of the resolver. Generating a first polarity signal indicating the polarity of the signal, generating a second polarity signal indicating the polarity of the second output signal of the resolver that is 90 ° out of phase with the first output signal, and a positive pulse When the negative polarity pulse and the excitation terminal are alternately input, the disconnection detection unit determines whether or not the combination of the first and second polarity signals is continuously the same, and the first and second polarity It includes that the disconnection detecting unit detects that the resolver is disconnected when the combination of signals is continuously the same.

  A resolver disconnection detecting device according to the present invention includes a pulse excitation unit that alternately inputs positive and negative pulses to a resolver excitation terminal at a predetermined time interval when a resolver rotor is rotating, and a resolver rotor The first output signal is input, the first comparator that generates the first polarity signal indicating the polarity of the first output signal, and the second output signal of the resolver whose phase is shifted by 90 ° from the first output signal, A second comparator for generating a second polarity signal indicating the polarity of the second output signal, and the first and second comparators from the first and second comparators when the positive polarity pulse and the negative polarity pulse are alternately input to the excitation terminal. When the second polarity signal is input, it is determined whether or not the combination of the first and second polarity signals is continuously the same, and when the combination of the first and second polarity signals is continuously the same, the resolver Refusal And a disconnection detecting section for detecting that has occurred.

  According to the resolver disconnection detection method and apparatus of the present invention, the resolver is based on the combination of the first and second polarity signals when the positive polarity pulse and the negative polarity pulse are alternately input to the excitation terminal of the resolver. Since the disconnection detector detects that disconnection has occurred, it is possible to detect disconnection of the resolver even during battery backup.

It is a block diagram which shows the resolver disconnection detection apparatus by Embodiment 1 of this invention. 2 is a graph showing first and second output signals of FIG. 1. It is explanatory drawing which shows the 1st example of a change of the combination of a 1st and 2nd polarity signal.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a resolver break detection device according to Embodiment 1 of the present invention, and FIG. 2 is a graph showing first and second output signals 11 and 12 of FIG. In FIG. 1, the resolver 1 is provided with an excitation terminal 1a, a first output terminal 1b, and a second output terminal 1c.

  As is well known, the excitation terminal 1a is a terminal connected to the excitation coil in the resolver 1, and an excitation signal 10 from the outside is input to the excitation terminal 1a. The first output terminal 1b is a terminal connected to the first output coil in the resolver 1, and the first output signal 11 of the resolver 1 is output from the first output terminal 1b. The second output terminal 1c is a terminal connected to the second output coil in the resolver 1, and the second output signal 12 of the resolver 1 is output from the second output terminal 1c.

  The first and second output signals 11 and 12 are signals whose phases are shifted by 90 ° from each other, and are signals in which the excitation signal 10 is amplitude-modulated according to the angular position of a resolver rotor (not shown). Assuming that the excitation signal of the excitation terminal 1a is E and the angular position of the resolver rotor is θ, as shown in FIG. 2, the first output signal 11 is represented by K · E · sin θ, and the second output signal 12 is It is represented by K · E · cos θ. K is a transformation ratio of the resolver 1.

As expressed in the graph of FIG. 2, the combination of the polarities of the first and second output signals 11 changes according to the quadrant that includes the angular position θ of the resolver rotor. That is, if the polarity of the first and second output signals 11 is positive by 1 and the polarity of the first and second output signals 11 is negative by 0, the first and second output signals 11 The 11 polar combinations are as follows. The following combinations of polarities are represented by (the polarity of the first output signal 11 and the polarity of the second output signal 11).
When the angular position θ is included in the first quadrant (0 ° or more and less than 90 °): (1, 1)
When the angular position θ is included in the second quadrant (90 ° or more and less than 180 °): (1, 0)
When the angular position θ is included in the third quadrant (180 ° or more and less than 270 °): (0, 0)
When the angular position θ is included in the fourth quadrant (more than 270 ° and less than 360 °): (0, 1)

  The resolver disconnection detection device of the present embodiment includes a pulse excitation unit 20, a first comparator 21, a second comparator 22, and a microcontroller 23.

  The pulse excitation unit 20 includes a push-pull circuit or the like (not shown), and is connected to the excitation terminal 1a of the resolver 1 and the microcontroller 23. The pulse excitation unit 20 generates a positive pulse PP and a negative pulse NP using the pulse signal 23a from the microcontroller 23, and uses the positive pulse PP and the negative pulse NP as an excitation signal 10 for a predetermined time. The signals are alternately input to the excitation terminal 1a of the resolver 1 at intervals.

The first comparator 21 is connected to the first output terminal 1b of the resolver 1, and the first output signal 11 is input from the first output terminal 1b. The first comparator 21 generates a first polarity signal 21 a indicating the polarity of the first output signal 11.
Similarly, the second comparator 22 is connected to the second output terminal 1c of the resolver 1, and the second output signal 12 is input from the second output terminal 1c. The second comparator 22 generates a second polarity signal 22 a indicating the polarity of the second output signal 12.

As described above, when the polarities of the first and second output signals 11 are positive by 1 and when the polarities of the first and second output signals 11 are negative by 0, the excitation terminal 1a has The combination of the first and second polarity signals 21a and 22a when the positive pulse PP is input is as follows.
<When positive pulse PP is input>
When the angular position θ is included in the first quadrant: (1, 1)
When the angular position θ is included in the second quadrant: (1, 0)
When the angular position θ is included in the third quadrant: (0, 0)
When the angular position θ is included in the fourth quadrant: (0, 1)

On the other hand, when the negative pulse NP is input to the excitation terminal 1a, the polarities of the first and second output signals 11 are inverted. That is, the combination of the first and second polarity signals 21a and 22a when the negative pulse NP is input to the excitation terminal 1a is as follows.
<Negative pulse NP input>
When the angular position θ is included in the first quadrant: (0, 0)
When the angular position θ is included in the second quadrant: (0, 1)
When the angular position θ is included in the third quadrant: (1, 1)
When the angular position θ is included in the fourth quadrant: (1, 0)

  When at least one of the first and second comparators 21 and 22 has no input, the output (first or second polarity signal 21a, 22a) of the comparator without input takes a preset value (0 or 1). Hereinafter, it is assumed that the output of the comparator without input is zero. Note that when the first output coil of the resolver 1 is disconnected, there is no input to the first comparator 21, and when the second output coil of the resolver 1 is disconnected, there is no input to the second comparator 22. Further, when the exciting coil of the resolver 1 is disconnected or when both the first and second output coils are disconnected, there is no input to both the first and second comparators 21 and 22.

  The microcontroller 23 constitutes a disconnection detector. The microcontroller 23 is connected to the output terminals of the first and second comparators 21 and 22, and the first and second polarity signals 21 a and 22 a are input from the first and second comparators 21 and 22.

  The microcontroller 23 inputs the pulse signal 23a to the pulse excitation unit 20, and when the positive polarity pulse PP and the negative polarity pulse NP are alternately inputted to the excitation terminal 1a, the first and second polarity signals 21a, It is determined whether the combinations of 22a are continuously the same. Moreover, the disconnection detection part 23 detects that the disconnection has arisen in the resolver 1 when the combination of the 1st and 2nd polarity signals 21a and 22a is the same continuously.

  Next, FIG. 3 is an explanatory diagram showing a first variation of the combination of the first and second polarity signals 21a and 22a. Note that the resolver rotor is rotated clockwise, and the angular position θ moves in the order of the third quadrant, the second quadrant, the first quadrant, and the fourth quadrant. Further, it is assumed that the second output coil is disconnected.

In FIG. 3, an arrow 1 _PP , an arrow 2 _NP, and an arrow 3 _PP indicate combinations of the first and second polarity signals 21 a and 22 a under the following conditions.
Arrow 1 _PP : Combination (0, 0) of the first and second polarity signals 21a and 22a when the positive pulse PP is input when the angular position θ of the resolver rotor is included in the third quadrant
Arrow 2 _NP : Combination (1, 0) of the first and second polarity signals 21a and 22a when the negative polarity pulse NP is input when the angular position θ of the resolver rotor is included in the third quadrant
Arrow 3 _PP : Combination (1, 0) of the first and second polarity signals 21a and 22a when the positive pulse PP is input when the angular position θ of the resolver rotor is included in the second quadrant.

When the positive pulse PP is input when the angular position θ of the resolver rotor is included in the third quadrant, the combination of the first and second polarity signals 21a and 22a is as indicated by the arrow 1 _PP ( 0,0).

Next, when the negative pulse NP is input when the angular position θ of the resolver rotor is included in the same quadrant, the combination of the first and second polarity signals 21a and 22a is originally (1 , 1), but as shown by the arrow 2 _NP , it becomes (1, 0). This is because the second output coil is disconnected, so that the second polarity signal 22a always takes zero. Even if the combination indicated by the arrow 2 _NP is input after the combination indicated by the arrow 1 _PP , the disconnection detection unit 23 does not detect that the disconnection has occurred in the resolver 1.

Next, when the positive polarity pulse PP is inputted with the angular position θ of the resolver rotor moved to the second quadrant, the combination of the first and second polarity signals 21a and 22a is as indicated by the arrow _3PP. (1, 0). That is, the same combination of the first and second polarity signals 21 a and 22 a is continuously input to the disconnection detection unit 23. As described above, the disconnection detection unit 23 detects that the resolver 1 is disconnected by inputting the combination indicated by the arrow 3 _PP after the combination indicated by the arrow 2 _NP .

  In contrast to the above example, when the resolver rotor is rotating counterclockwise, a negative pulse NP is input in the fourth quadrant and then a positive pulse PP is input in the first quadrant. At this time, the same combination (1, 0) of the first and second polarity signals 21a and 22a is continuously input to the disconnection detector 23, and it is detected that the resolver 1 is disconnected.

  When the first output coil is disconnected and the resolver rotor is rotating clockwise, the negative pulse NP is input in the fourth quadrant, and then the positive pulse PP is input in the third quadrant. In this case, the same combination (0, 0) of the first and second polarity signals 21a, 22a is continuously input to the disconnection detector 23, and it is detected that the resolver 1 is disconnected. In addition, when the first output coil is disconnected and the resolver rotor rotates counterclockwise, the positive pulse PP is input in the second quadrant after the negative pulse NP is input in the first quadrant. When this is done, the same combination (0, 0) of the first and second polarity signals 21a, 22a is continuously input to the disconnection detector 23, and it is detected that the resolver 1 is disconnected.

  Furthermore, when both the first and second output coils are disconnected or the excitation coil is disconnected, the first and second polarity signals 21a and 22a are always (0, 0). The disconnection detector 23 receives the pulse signal 23a, and the first and second polarity signals 21a, 21a, 21a, When 22a is always (0, 0), it is detected that both the first and second output coils are disconnected or the excitation coil is disconnected.

  The microcontroller 23 monitors the rotation of the resolver rotor based on the combination of the first and second polarity signals 21a and 22a, and while the angular position θ of the resolver rotor is included in the same quadrant, The pulse excitation unit 20 determines a time interval for inputting the positive pulse PP and the negative pulse NP so that the positive pulse PP and the negative pulse NP are input to the excitation terminal 1a at least once.

  Specifically, the microcontroller 23 stores a combination of the first and second polarity signals 21a and 22a. For example, it is assumed that data of P (1, 0) → N (0, 1) → P (1, 0) → N (0, 1) continues eight times. In this case, the microcontroller 23 determines that the resolver rotor is stopped in the second quadrant or that the rotational speed of the resolver rotor is slower than the excitation interval, and increases the pulse excitation interval by one step. That is, a plurality of excitation intervals are preset in the microcontroller 23. On the contrary, the microcontroller 23 determines that the excitation can be performed only twice in the same quadrant if there are four quadrant movements out of eight times, and shortens the excitation interval by one step. If quadrant movement occurs continuously, it is determined that excitation can be performed only once in the same quadrant, and the excitation interval is immediately shortened.

  According to such a resolver disconnection detection method and apparatus, the first and second polarity signals 21a and 22a when the positive pulse PP and the negative pulse NP are alternately input to the excitation terminal 1a of the resolver 1 are used. Since the microcontroller 23 detects that the resolver 1 is disconnected based on the combination of the above, the disconnection of the resolver 1 can be detected even during battery backup.

  The predetermined time interval for inputting the positive polarity pulse PP and the negative polarity pulse NP is at least 1 for the positive polarity pulse PP and the negative polarity pulse NP while the angular position of the resolver rotor is included in the same quadrant. Since the interval is input to the excitation terminal 1a every time, it is possible to more reliably detect the disconnection of the resolver 1 based on the combination of the first and second polarity signals 21a and 22a.

DESCRIPTION OF SYMBOLS 1 Resolver 1a Excitation terminal 10 Excitation signal 11,12 1st and 2nd output signal 20 Pulse excitation part 21,22 1st and 2nd comparator 21a, 22a 1st and 2nd polarity signal 23 Microcontroller (disconnection detection part)
NP Negative polarity pulse PP Positive polarity pulse

Claims (4)

When the resolver rotor is rotating, a positive polarity pulse and a negative polarity pulse are alternately input at predetermined time intervals to the excitation terminal of the resolver,
Generating a first polarity signal indicative of the polarity of the first output signal of the resolver;
Generating a second polarity signal that indicates a polarity of the second output signal of the resolver that is 90 ° out of phase with the first output signal; and the positive polarity pulse and the negative polarity pulse are alternately applied to the excitation terminal. The disconnection detector determines whether the combination of the first and second polarity signals is continuously the same, and the combination of the first and second polarity signals is continuously A resolver disconnection detection method comprising: the disconnection detection unit detecting that the disconnection occurs in the resolver when they are the same. The predetermined time interval is an interval in which the positive polarity pulse and the negative polarity pulse are input to the excitation terminal at least once while the angular position of the resolver rotor is included in the same quadrant. The resolver disconnection detection method according to claim 1, wherein: A pulse excitation unit that alternately inputs positive and negative polarity pulses at predetermined time intervals to the excitation terminal of the resolver when the resolver rotor is rotating;
A first comparator that receives a first output signal of the resolver and generates a first polarity signal indicating a polarity of the first output signal;
A second comparator that receives a second output signal of the resolver that is 90 ° out of phase with the first output signal, and generates a second polarity signal indicating the polarity of the second output signal;
When the positive pulse and the negative pulse are alternately input to the excitation terminal, the first and second polarity signals are input from the first and second comparators, and the first and second polarities are input. Disconnection detection for determining whether the combination of signals is continuously the same, and detecting that the resolver is disconnected when the combination of the first and second polarity signals is the same continuously And a resolver disconnection detecting device. The predetermined time interval is an interval in which the positive polarity pulse and the negative polarity pulse are input to the excitation terminal at least once while the angular position of the resolver rotor is included in the same quadrant. The resolver disconnection detecting device according to claim 3, wherein:

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