JP2010085236A - Envelope generating device, and door opening and closing apparatus with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an envelope generating device which alleviates an arithmetic operation load by reducing the number of data operated in generating an envelope, and also generates the envelope by using an inexpensive microcomputer. <P>SOLUTION: The envelope generating device 20 which generates the envelope of an amplitude wave oscillating at a prescribed period, includes: a peak value detecting section 24 which divides a half period of the amplitude wave into three portions being a first amplitude period, a second amplitude period and a third amplitude period, and detects a peak value of the amplitude wave for every second amplitude period; and an envelope generating section 27 which connects only peak values of upper-side waveforms in regard to an amplitude reference of the amplitude wave or only peak values of lower-side waveforms in regard to the amplitude reference among detected peak values, and generates at least one-side envelope of the upper-side waveforms and the lower-side waveforms. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an envelope generation device that generates an envelope of an amplitude waveform that amplitudes in a predetermined cycle, and a door opening and closing device that includes such an envelope generation device.

  As an example of a technique for generating such an envelope, there is a vibration measuring device (Patent Document 1), a digital envelope generating device (Patent Document 2), a motion analysis display device (Patent Document 3), etc. .

  The vibration measuring device described in Patent Document 1 is a filter that attenuates a predetermined frequency component included in a full-wave rectified detection signal and a half-wave rectified detection signal in order to measure vibration received by a bearing or the like. An envelope is generated using peak hold means for detecting the peak value, and the detection signal is analyzed.

  Further, a digital envelope generating apparatus described in Patent Document 2 includes a memory table in which output values for input values are written in advance, and each arithmetic unit in order to generate an envelope of modulated waves with high accuracy and low memory capacity. And a shift circuit for shifting the output value to the upper digit.

  Further, the motion analysis display device described in Patent Document 3 generates an envelope with a predetermined time width in order to analyze information acquired from the motion sensor.

JP 2008-20277 A JP-A-3-283803 JP 2006-296618 A

  Like the technique described in Patent Documents 1-3 described above, a microcomputer is used for peak holding of a detection signal using an analog circuit, frequency analysis of the detection signal, and generation of an envelope in a state with less noise. Even if it is feasible. However, in the vehicle, when the detection signal changes depending on the external signal, how to strike, the part to be tapped, and the hardness of the object to be tapped, the technique described in Patent Documents 1-3 cannot easily generate the envelope. In particular, in the technique described in Patent Document 2, a large-capacity memory is required for the envelope processing, and therefore it is not easy to reduce the cost or reduce the size.

  The present invention has been made in view of the above problems, and its purpose is to reduce the processing load by reducing the number of data handled in the generation of the envelope, and to generate the envelope with an inexpensive microcomputer. It is an object of the present invention to provide a simple envelope generation device and a door opening / closing device that opens and closes a vehicle door equipped with such an envelope generation device.

  In order to achieve the above object, the characteristic configuration of the envelope generating apparatus according to the present invention is to generate a half-cycle of the amplitude waveform and a first amplitude period in order to generate an envelope of an amplitude waveform that amplitudes in a predetermined cycle. A peak value detector for detecting a peak value of the amplitude waveform for each of the second amplitude periods; and an amplitude of the amplitude waveform among the detected peak values. An envelope generation unit that connects only the peak value of the upper waveform with respect to the reference or only the peak value of the lower waveform with respect to the amplitude reference, and generates an envelope of at least one of the upper waveform and the lower waveform; There is in point.

  With such a characteristic configuration, the peak value detection unit only needs to detect the peak value of the amplitude waveform in the second amplitude period, and detection of the peak value of the amplitude waveform in the first amplitude period and the third amplitude period is unnecessary. It becomes. For this reason, since the number of data handled in the detection of the peak value can be reduced, it is possible to reduce the arithmetic processing load. Therefore, since an envelope can be generated without using a high-performance microcomputer, it is possible to generate an envelope with an inexpensive microcomputer.

  The first amplitude period, the second amplitude period, and the third amplitude period are preferably divided into three equal parts.

  With such a configuration, the number of data related to peak value detection can be reduced to 1/3. Therefore, it is possible to greatly reduce the arithmetic processing load.

  Further, based on one of the peak value of the detected upper waveform and the peak value of the detected lower waveform, and the detected peak value of the other continuous with the one peak value, the envelope It is preferable to include a correction unit that corrects the other peak value used when generating.

  With such a configuration, even if the detected peak value deviates from the continuous peak value by a large protrusion or depression, an envelope is appropriately generated by correcting it. It becomes possible to do.

  Further, it is preferable that the correction unit corrects based on a difference between the detected one peak value and the detected other continuous peak value.

  With such a configuration, it is possible to appropriately correct the peak value by calculating the difference between the detected peak values. Therefore, a smooth envelope can be generated.

  In addition, the envelope generation unit, when the slope of the envelope generated by connecting only the peak value of the upper waveform or only the peak value of the lower waveform is outside a predetermined range, It is preferable to generate the envelope by excluding a peak value that forms a slope outside the predetermined range.

  With such a configuration, even if the peak value is abnormal due to some cause, an envelope is generated by excluding the peak value considered to be abnormal, and thus a smooth envelope is generated. Can do.

  A pulse signal generator for generating a pulse signal corresponding to a period of the amplitude waveform calculated from the peak value of the upper waveform and the peak value of the lower waveform; and a half cycle of the pulse signal as a first pulse period And a second pulse period and a third pulse period, and a period determination unit that determines whether the peak value of the upper waveform and the peak value of the lower waveform exist for each second pulse period And are preferably provided.

  With such a configuration, it can be determined whether or not the period of the peak value is shifted based on the reference pulse signal. Therefore, it becomes possible to generate an envelope appropriately.

  In addition, the characteristic configuration of the door opening and closing device according to the present invention includes a vibration detection sensor that detects vibration caused by a user's opening / closing command operation on the vehicle door, and an envelope generation that generates an envelope of a vibration waveform based on the vibration. And a determination unit that determines whether or not the opening / closing command operation has been performed based on the envelope.

  With such a characteristic configuration, it is possible to determine whether or not an opening / closing command operation has been performed using an appropriate envelope generated by the envelope generation unit, and thus there is no possibility of erroneous detection. Can be configured.

[First Embodiment]
Hereinafter, the envelope generating apparatus 20 according to the present invention and the door opening and closing apparatus 100 including the envelope generating apparatus 20 will be described. The envelope generation apparatus 20 has a function of generating an envelope of an amplitude waveform that amplitudes with a predetermined period. As will be described in detail later, it has a function of reducing the processing load by reducing the number of data to be handled when generating an envelope. The door opening / closing device 100 detects the input of the user's opening / closing command operation on the vehicle door based on the envelope generated by the envelope generation device 20 and opens / closes the vehicle door. It has a function. FIG. 1 is a block diagram schematically showing a schematic configuration of an envelope generation device 20 according to the present invention and a door opening / closing device 100 provided with such an envelope generation device 20.

  The envelope generation device 20 includes a filter 21, a signal detection unit 22, a peak value detection unit 24, and an envelope generation unit 27. The door opening / closing device 100 includes a vibration detection sensor 10, an envelope generation device 20, a determination unit 30, and a door control unit 40.

  Here, the envelope generating apparatus 20 and the door opening / closing apparatus 100 perform the above-described functional unit for performing various processes for generating an envelope with the CPU as a core member, and various processes for opening and closing the vehicle door. Therefore, the above-described functional unit is constructed by hardware and / or software. Hereinafter, the configuration of each part of the envelope generation device 20 and the door opening and closing device 100 will be described.

  The filter 21 is composed of a bandpass filter and is provided at the input stage of the envelope generation device 20. The filter 21 attenuates frequency components other than a predetermined frequency band in the input signal input to the envelope generation device 20. This predetermined frequency band can be changed according to the signal to be detected. In the present embodiment, the input signal input to the envelope generation device 20 corresponds to a detection signal output from the vibration detection sensor 10 included in the door opening / closing device 100. Therefore, in the following description, the input signal input to the filter 21 will be described as a detection signal from the vibration detection sensor 10. The filter 21 transmits a signal obtained by attenuating a predetermined frequency component in the detection signal from the vibration detection sensor 10 (hereinafter referred to as an attenuation signal S) to a signal detection unit 22 described later. The vibration detection sensor 10 will be described later.

  The signal detector 22 acquires the attenuation signal S output from the filter 21. Here, the detection signal from the vibration detection sensor 10 is an amplitude waveform that amplitudes in a predetermined cycle. Therefore, the signal detection unit 22 acquires an amplitude waveform related to the attenuation signal S. In addition, an amplification unit (not shown) is provided between the vibration detection sensor 10 and the filter 21 or between the filter 21 and the signal detection unit 22, and the detection signal or the detection signal after the filtering process performed by the filter 21 is performed. It may be amplified.

The peak value detection unit 24 divides the half cycle of the amplitude waveform into a first amplitude period A ₁ , a second amplitude period A _2, and a third amplitude period A _3, and the amplitude waveform for each second amplitude period A _{2 is} divided. Detect peak value. In the case of this embodiment, the amplitude waveform corresponds to the above-described attenuation signal S. The attenuation signal S is obtained by attenuating a predetermined frequency component of the detection signal from the vibration detection sensor 10. Further, the half period of the amplitude waveform corresponds to the time from when the amplitude waveform exceeds the amplitude reference to the time when it falls below, or the time from when the amplitude waveform falls below the amplitude reference to the time when it exceeds the amplitude reference. Therefore, the calculation of the half cycle of the amplitude reference is used as a trigger when the amplitude waveform exceeds the amplitude reference or when the amplitude waveform falls below the amplitude reference. Then, from the time of the first trigger, the first amplitude period A ₁ , the second amplitude period A _2, and the third amplitude period A ₃ are sequentially divided. As will be described later, this can be realized because it is possible to predict in advance that the period of the amplitude waveform output from the vibration detection sensor 10 is a predetermined period. Although the amplitude reference is described in detail later, it does not simply indicate the amplitude center of the amplitude waveform but indicates the reference of the amplitude waveform.

  Here, the vibration detection sensor 10 detects vibration caused by a user's opening / closing command operation on the vehicle door. This opening / closing command operation corresponds to a knock operation. Therefore, the vibration detection sensor 10 detects vibration related to the knock operation. Since the vibration related to the knocking operation generally has an amplitude with the same period, the envelope generation apparatus 20 may predict the period of the attenuation signal S transmitted from the signal detection unit 22 in advance. it can.

  Here, FIG. 2 is a diagram illustrating an example of a vibration attenuation signal S related to the knocking operation detected by the vibration detection sensor 10. Thus, the amplitude waveform of the vibration related to the knocking operation is a sine wave. Therefore, the envelope generation apparatus 20 can predict in advance which part (which time zone) of the attenuation signal S has the peak value.

When detecting the peak value, the peak value detection unit 24 divides the half cycle of the amplitude waveform into a first amplitude period A ₁ , a second amplitude period A _2, and a third amplitude period A ₃ . Figure 3 is an enlargement of the amplitude waveform during the time t ₁ in FIG. 2 to t _3, corresponding to one period of the amplitude waveform. Therefore, in the amplitude waveform shown in FIG. 3, the half period of the amplitude waveform corresponds to a period from time t ₁ to t ₂ or a period from time t ₂ to t ₃ . The peak value detection unit 24 converts the amplitude waveform of such a half cycle (for example, from time t ₁ to t ₂ or from time t ₂ to t ₃ ) into the first amplitude period A ₁ and the second amplitude. The period A ₂ and the third amplitude period A ₃ are divided into three.

The three divisions are preferably performed so that the first amplitude period A ₁ , the second amplitude period A _2, and the third amplitude period A ₃ are equally divided into three. The three equal parts can be realized because the period of the amplitude waveform input to the peak value detection unit 24 can be predicted in advance as described above.

The peak value detection unit 24 detects the peak value of the amplitude waveform for each second amplitude period A ₂ out of the periods equally divided into three as described above. That is, in the example of FIG. 3, the peak value during the time t ₁₁ to t ₁₂ and the peak value during the time t ₂₁ to t ₂₂ are detected. Accordingly, detection of peak values in the first amplitude period A ₁ and the third amplitude period A ₃ is not performed. For this reason, according to the envelope generation device 20, the amount of data handled in the detection of the peak value can be significantly reduced compared to the case where the peak value is detected from the data of the entire period (this embodiment). In the form, it can be reduced to 1/3).

In the amplitude waveform shown in FIG. 2, the peak value detected by the peak value detector 24 is shown in FIG. In FIG. 4, the amplitude waveform of the attenuation signal S is indicated by a dotted line, and the amplitude waveform during each second amplitude period A ₂ is indicated by a solid line. Further, each of P ₁ and the peak value detected in each second amplitude period A2, P _2, P _3, · · ·, are shown as P _n. In this way, the peak value detector 24 detects the peak value for each half cycle of the amplitude waveform. The peak value detected by the peak value detection unit 24 is transmitted to the envelope generation unit 27 described later.

  The envelope generation unit 27 connects only the peak value of the upper waveform with respect to the amplitude reference of the amplitude waveform or only the peak value of the lower waveform with respect to the amplitude reference among the detected peak values, so that the upper waveform and the lower waveform are connected. At least one envelope is generated. The amplitude reference of the amplitude waveform does not simply indicate the amplitude center of the amplitude waveform but indicates the reference of the amplitude waveform. That is, when the amplitude waveform is composed of a positive voltage and a negative voltage, it indicates zero potential. The upper waveform indicates a waveform positioned above the amplitude reference, and the lower waveform indicates a waveform positioned lower than the amplitude reference. In the present embodiment, the amplitude reference is described as being zero potential.

The envelope generation unit 27 includes only the peak value of the upper waveform with respect to the amplitude reference of the amplitude waveform among the peak values detected by the peak value detection unit 24 (P ₁ , P ₃ , P ₅ ,. ) To generate an upper waveform envelope W1. In addition, the envelope generation unit 27 includes only the peak value of the lower waveform with respect to the amplitude reference of the amplitude waveform among the peak values detected by the peak value detection unit 24 (P ₂ , P ₄ , P ₆ , ..) Are connected to generate the lower waveform envelope W2. The envelope generation unit 27 generates at least one of the envelope W1 and the envelope W2. Therefore, when generating the envelope W1, it is not necessary to generate the envelope W2, and when generating the envelope W2, it is not necessary to generate the envelope W1. Of course, both the envelope W1 and the envelope W2 may be generated.

  In this way, the envelope generation device 20 according to the present invention can reduce the number of data handled in the generation of the envelope by generating the envelope. For this reason, since the calculation processing load performed by the envelope generation device 20 can be reduced, it can be configured with an inexpensive microcomputer.

  Together with the envelope generation device 20, the vibration detection sensor 10, the determination unit 30, and the door control device 40 constitute a door opening / closing device 100. Hereinafter, the door opening and closing device 100 will be described.

  As described above, the vibration detection sensor 10 detects vibration generated by a knocking operation given to the vehicle door by the user. For this reason, it is preferable that the vibration detection sensor 10 is configured by a piezoelectric sensor that can output a detection signal in accordance with externally applied vibration. The vibration detection sensor 10 transmits the detection result to the envelope generation device 20 described above.

  The envelope generation device 20 generates an envelope of a vibration waveform based on vibration. Since the generation of the envelope has been described above, the description thereof is omitted here. The envelope generated by the envelope generation device 20 is transmitted to the determination unit 30 described later. At this time, the transmitted envelope may be at least one of the envelope W1 related to the upper waveform and the envelope W2 related to the lower waveform.

  The determination unit 30 determines whether an open / close command operation has been performed based on the envelope. The vibration generated by the knocking operation by the user has a so-called hitting characteristic. Such a hit characteristic is a known technique and will not be described in detail, but it is determined that the hit characteristic is provided when the gradient of the envelope is a specific gradient. And generally knock operation is hit twice or more as a series of knock operation. For this reason, the door opening and closing apparatus 100 determines that there is a user's will when a knock operation having such a hitting feature is detected twice. The determination unit 30 transmits a determination result obtained by determining whether or not the hit characteristic is included in the envelope to the door control unit 40 described later. Note that the gradient of the envelope curve described above varies depending on the position and material of the vehicle and is preferably set according to the position and material of the vibration detection sensor 10.

  As described above, the door control unit 40 controls the opening / closing operation of the vehicle door based on the determination result of the determination unit 30. That is, when the determination unit 30 determines that the hit characteristic is included in the envelope, it is determined that the vibration detected by the vibration detection sensor 10 is a vibration related to the knocking operation by the user. Open / close operation. On the other hand, when it is determined that the envelope does not have a hitting feature, the vehicle door is not opened / closed because it is not determined that the knocking operation is performed by the user.

  In this way, the door opening / closing device 1 determines whether or not the vibration detected by the vibration detection sensor 10 is a vibration related to a knocking operation by the user, whereby the user's opening / closing command for the vehicle door is determined. The presence or absence of the operation can be determined without erroneous detection, and the vehicle door can be appropriately opened and closed.

[Second Embodiment]
Next, a second embodiment of the envelope generation device 20 according to the present invention will be described. FIG. 5 is a block diagram schematically showing a schematic configuration of the envelope generation device 20 and the door opening / closing device 100 according to the present embodiment. The envelope generation device 20 according to the present embodiment is different from the above-described first embodiment in that the correction unit 25 is provided. Therefore, in the following description, the correction unit 25 will be mainly described. Unless otherwise specified, the other functional units are the same as those in the first embodiment, and thus the description thereof is omitted. The envelope generation device 20 according to the present embodiment has a function of appropriately correcting such a peak value when the peak value detected by the peak value detection unit 24 includes a certain degree of variation. . The function will be described below.

  The correction unit 25 calculates an envelope based on one of the detected peak value of the upper waveform and the detected peak value of the lower waveform, and the other detected peak value continuous with the one peak value. The other peak value used when generating is corrected. The peak value of the upper waveform and the peak value of the lower waveform related to the vibration waveform detected by the peak value detection unit 24 are transmitted to the correction unit 25.

  The other detected peak value that is continuous with one peak value is related to the lower waveform that is continuous with the peak value related to the upper waveform when one peak value is the peak value related to the upper waveform. The peak value corresponds. Further, when one peak value is a peak value related to the lower waveform, a peak value related to the upper waveform that is continuous with the peak value related to the lower waveform corresponds to the peak value. That is, one of the peak value of the detected upper waveform and the peak value of the detected lower waveform and the other detected peak value that is continuous with the one peak value are a pair of continuous upper waveform and lower peak value. This corresponds to a side waveform.

  The correction unit 25 corrects the other peak value used when generating the envelope based on the pair of continuous upper waveform and lower waveform composed of one peak value and the other peak value. To do. That is, the peak value of the lower waveform is corrected based on the peak value of the continuous upper waveform and the peak value of the lower waveform, and an envelope is generated using the corrected peak value. Alternatively, the peak value of the upper waveform is corrected based on the peak value of the continuous lower waveform and the peak value of the upper waveform, and an envelope is generated using the corrected peak value.

Such peak value correction will be described with reference to the drawings. FIG. 6 is a diagram showing an amplitude waveform (broken line) of the attenuation signal S at a predetermined time (t _{1 to} t ₆ ). Similar to the first embodiment described above, first, the peak detector 24 detects the peak value P ₁ of the second amplitude period A ₂ from t ₁ to t ₂ . In FIG. 6, the amplitude waveform during the second amplitude period A ₂ is shown by a solid line. This peak value P ₁ is transmitted to the envelope generation unit 20 and the correction unit 25.

Subsequently, the peak detection unit 24 detects the peak value P ₂ of the second amplitude period A ₂ from t ₂ to t ₃ . This peak value P _{2 is} also transmitted to the envelope generation unit 20 and the correction unit 25. Correcting unit 25 uses the peak detected continuously detected peak value P ₁ and the peak value P ₁ above value P _2, corrects the peak value P _2. The correction unit 25 to which such two peak values are transmitted corrects based on the difference between the detected _one peak value P ₁ and the detected other continuous peak value P ₂ . That is, first, the difference between the two peak values (P ₁ and P ₂ ) is calculated. Then, ½ of the difference is calculated. The correction unit 25 corrects the peak value P ₂ by ½ of the calculated difference to obtain a peak value P ₂ ′ used when generating an envelope. For example, when the peak value P ₁ is 5V and the peak value P ₂ is 3V, the peak value P ₂ ′ is calculated as 4V. Then, the correction unit 25 uses the peak value P ₂ ', corrects the peak value P ₂ that is transmitted to the envelope generator 20 from the peak value detector 24.

Similarly, subsequently, the peak detector 24 detects the peak value P ₃ of the second amplitude period A ₂ from t ₃ to t ₄ . This peak value P _{3 is} also transmitted to the envelope generation unit 20 and the correction unit 25. Correcting unit 25, the peak value P ₃ by using the peak value P _3, which corrected 'and the peak value P _2' peak value P ₂ is detected continuously and the peak was detected earlier value P ₂ The peak value P ₃ ′ used for generating the envelope is corrected. That is, when the peak value P ₂ ′ is 4V and the peak value P ₃ is 3V, the peak value P ₃ ′ is calculated as 3.5V. Then, the correction unit 25 uses the peak value P ₃ ', corrects the peak value P ₃ transmitted from the peak value detector 24 to the envelope generator 20.

Similarly, the other peak value is corrected using one peak value and the other peak value of the peak value of the continuous upper waveform and the peak value of the lower waveform. The peak values corrected in this way are shown as P ₄ ′, P ₅ ′, P ₆ ′,... In FIG.

The envelope generator 27 connects only the peak value of the upper waveform with respect to the amplitude reference or only the peak value of the lower waveform with respect to the amplitude reference among the peak values corrected in this way, An envelope of at least one of the waveforms is generated. That is, P ₁ , P ₃ ′, P ₅ ′,... Are connected to generate an upper waveform envelope W ₁ . Further, P ₂ ′, P ₄ ′, P ₆ ′,... Are connected to generate an upper waveform envelope W ₂ .

  Further, the door opening / closing device 100 opens / closes the vehicle door by determining the presence / absence of the user's opening / closing command operation from the envelope thus corrected. Therefore, even when a peak value greatly deviating from other peak values is detected, it is possible to appropriately detect the user's opening / closing command operation.

[Third Embodiment]
Next, a third embodiment of the envelope generation device 20 according to the present invention will be described. FIG. 7 is a block diagram schematically showing a schematic configuration of the envelope generation device 20 and the door opening / closing device 100 according to the present embodiment. The envelope generation device 20 according to the present embodiment is different from the first embodiment described above in that it includes a pulse signal generation unit 23 and a period determination unit 26. Therefore, in the following description, the pulse signal generation unit 23 and the period determination unit 26 will be mainly described. Unless otherwise specified, the configuration of other functional units is the same as that of the first embodiment, and thus the description thereof is omitted. To do. The envelope generation apparatus 20 according to the present embodiment has a function of stopping the generation of an envelope when the variation in peak values detected by the peak value detection unit 24 is large. The function will be described below.

  The pulse signal generator 23 generates a pulse signal corresponding to the period of the amplitude waveform calculated from the peak value of the upper waveform and the peak value of the lower waveform. The peak value of the upper waveform and the peak value of the lower waveform are transmitted from the peak value detection unit 24. The peak value of the upper waveform and the peak value of the lower waveform to be transmitted need only be at least for the first period. The pulse signal generator 23 calculates a time difference between the time when the peak value of the transmitted upper waveform is detected and the time when the peak value of the lower waveform is detected. And the pulse signal which makes the said time difference a half cycle is generated. This pulse signal is generated as a binary signal that is binarized so that the upper waveform of the attenuation signal S becomes a Hi signal and the lower waveform of the attenuation signal S becomes a Low signal. FIG. 8 shows the pulse signal generated according to the period of the amplitude waveform of the attenuation signal S in this way. 8A shows the attenuation signal S, and FIG. 8B shows a pulse signal corresponding to the attenuation signal S in FIG. 8A. Note that the pulse signal generator 23 continuously generates a pulse signal having the same cycle as the cycle calculated from the first cycle of the attenuation signal S. The pulse signal generated in this way is transmitted to the cycle determination unit 26 described later.

The period determination unit 26 divides the half cycle of the pulse signal into a first pulse period B ₁ , a second pulse period B _2, and a third pulse period B _3, and generates an upper waveform for each second pulse period B ₂ . It is determined whether the peak value and the peak value of the lower waveform exist. Here, the pulse signal generated based on the attenuation signal S from the pulse signal generator 23 is input to the period determination unit 26. As shown in FIG. 8B, the period from time t ₁ to t ₃ corresponds to one period of the pulse signal. Therefore, the half cycle of the pulse signal corresponds to a period from time t ₁ to t ₂ or a period from time t ₂ to t ₃ . The period determination unit 26 uses the amplitude waveform of such a half period (for example, from time t ₁ to t ₂ or from time t ₂ to t ₃ ) as the first pulse period B ₁ and the second pulse period. It is divided into three, B ₂ and the third pulse period B ₃ .

The cycle determining section 26, the second per pulse period B _2, determines whether the peak value of the peak value and the lower waveform the upper waveform is present. Here, the peak value detected by the peak value detection unit 24 is transmitted to the period determination unit 26. Also in this embodiment, the peak value detector 24 detects the peak value of the amplitude waveform for each second amplitude period. The period determination unit 26 determines whether or not there is a peak value detected during the second pulse period A ₂ in the second pulse period B ₂ in the half period of the same time (for example, between time t ₁ and t ₂ ). Determine. That is, it is determined whether or not the peak value of the upper waveform exists between time t ₁ and t ₂ . This determination is performed every half cycle thereafter. Cycle determining section 26, the second per pulse period B _2, if the peak value of the peak value and the lower waveform the upper waveform is alternately detected, the period of the attenuation signal S is determined to be correct. This determination result is transmitted to the envelope generation unit 27, and the envelope generation unit 27 generates an envelope based on the peak value transmitted from the peak value detection unit 24.

On the other hand, FIG. 9A shows a case where the cycle of the attenuation signal S changes with time. Even in this case, as shown in FIG. 9B, the pulse signal generated by the pulse signal generator 23 has a period calculated from the peak value of the first one period (t1 to t3) of the attenuation signal S. Generated continuously. As shown in FIG. 9 (a), when the period of the attenuation signal S varies with the passage of time, the time and the second pulse period B _2, the time and the lower the peak value of the original upper waveform There is a case where the time of the peak value of the side waveform is shifted.

This deviation can be determined as follows. First, it is determined whether or not the amplitude signal S corresponding to the second pulse period B ₂ between time t ₁ and t ₂ has a peak value. 9A and 9B, since the peak value P ₁ is present in the second pulse period B ₂ between the times t ₁ and t ₂ , the period determining unit 26 determines that there is no deviation in the period. . Next, it is determined whether or not the amplitude signal S corresponding to the second pulse period B ₂ between time t ₂ and t ₃ has a peak value. 9A and 9B, since the peak value P ₂ is present in the second pulse period B ₂ between time t ₂ and t ₃ , the period determining unit 26 determines that there is no deviation in the period. . Similarly, determination processing is performed thereafter.

Here, in the present invention, the peak value detector 24 detects the peak value of the preset amplitude waveform of the attenuation signal S. Therefore, the peak value changes with time, but the peak value detected next to the peak value of the upper waveform is the peak value of the lower waveform, and the peak value detected next to the peak value of the lower waveform Is the peak value of the upper waveform. In addition, since the attenuation signal S is a sinusoidal signal, it has a convex waveform upward in the second amplitude period B _{2 of} the upper waveform, and a downward convex waveform in the second amplitude period B _{2 of} the lower waveform. Become.

Therefore, in the second pulse period B ₂ in the Hi state of the pulse signal generated by the pulse signal generating section 23, the peak value of the upper waveform of convex shape is formed on the amplitude waveform of the attenuated signal S, a pulse signal In the second pulse period B ₂ in the Low state, the amplitude waveform of the attenuation signal S is the peak value of the lower waveform having a downwardly convex shape. The period determination unit 26 determines that the period of the attenuation signal S is not correct when such a condition is not satisfied.

That is, in the example shown in FIG. 9, the pulse signal is in the low state from time t ₄ to time t ₅ , but the peak value of the attenuation signal S that is convex downward is not detected during this time. . Therefore, the period determination unit 26 determines that the peak value is not correct. Similarly, from time t ₅ to time t ₆ , the pulse signal is in the Hi state, but during this time, the peak value of the attenuation signal S that is convex upward is not detected. Further, in the t ₇ from the time t _6, the pulse signal is in a Low state, between the time the peak value of the attenuation signal S a downwardly convex shape is not detected. Therefore, the period determination unit 26 determines that the peak values at time t ₄ to t ₅ , time t ₅ to t _6, and time t ₆ to t ₇ are not correct. When the period determination unit 26 determines that the peak value is not correct in some periods as described above, the period determination unit 26 determines that the period of the attenuation signal S is not correct, and transmits the determination result to the envelope generation unit 27.

  The envelope generation unit 27 generates an envelope when the determination result transmitted from the cycle determination unit 26 is a determination result indicating that the cycle of the attenuation signal S is correct. On the other hand, when the determination result transmitted from the period determination unit 26 is a determination result indicating that the period of the attenuation signal S is not correct, the generation of the envelope is stopped. In this case, since the envelope is not transmitted from the envelope generation unit 27 to the determination unit 30, the determination unit 30 does not determine that there has been an opening / closing command operation by the user, and thus the vehicle door opening / closing control is not performed. In this way, the envelope generating device 20 generates an envelope when an appropriate signal is input, and the door opening / closing device 100 is appropriately used for a vehicle based on the envelope generated by the envelope generating device 20. Perform door opening and closing control.

[Other Embodiments]
In the above embodiment, the peak value detection unit 24 has been described as detecting the peak value of the upper waveform and the peak value of the lower waveform. The peak value detection unit 24 is preferably composed of, for example, a peak hall circuit that detects the peak value of the upper waveform and a bottom hold circuit that detects the peak value of the lower waveform. When the peak hold circuit and the bottom hold circuit are configured in this way, the data to be handled can be one by one, so that the processing load can be further reduced.

In the above embodiment, the peak value detector 24 is described as dividing the half cycle of the amplitude waveform related to the attenuation signal S into three equal parts, the first amplitude period A ₂ , the second amplitude period A _2, and the third amplitude period A _3. did. However, the scope of application of the present invention is not limited to this. Of course, it is also possible to detect by dividing into other than three equal parts.

In the second embodiment, it has been described that the peak value is corrected. However, the scope of application of the present invention is not limited to this. When the slope of the envelope generated by connecting only the peak value of the upper waveform or only the peak value of the lower waveform is outside the predetermined range, the envelope generation unit 27 is outside the predetermined range. It is preferable to generate an envelope by excluding the peak value that forms the slope of. That is, as shown in FIG. 10, for example, the peak value P ₃ is greatly deviated from the peak values of other upper waveforms (P ₁ , P ₅ , P ₇ , P ₉ ,...). In this case, the slope of the envelope associated with the peak value P ₃ is abnormally larger than the slope of the envelope formed by the other peak values. For this reason, the envelope generation unit 27 may be configured to generate the envelope W ₁ by excluding such peak value P ₃ . For example, when the peak value P ₄ is greatly deviated from the peak values (P ₂ , P ₆ , P ₈ , P ₁₀ ,...) Of the other lower waveform, the peak value P ₄ is related. The slope of the envelope becomes abnormally small compared to the slope of the envelope formed by other peak values. For this reason, the envelope generation unit 27 may be configured to generate the envelope W ₂ by excluding the peak value P ₄ . Whether such an inclination is abnormal or not is set in advance as a predetermined range of a normal value of normal inclination. Therefore, it is possible to determine by comparing such a prescribed value with the actual inclination. Even if such a peak value is excluded, the envelope W ₁ or W ₂ can be appropriately generated. It is also possible to detect the presence / absence of a user's opening / closing command operation based on the envelope generated in this way.

In the above embodiment, the pulse signal generation unit 23 has been described as generating a binarized pulse signal. However, the scope of application of the present invention is not limited to this. For example, instead of the binarized signal, a configuration that generates a sine wave, a triangular wave, or the like as a pulse signal is naturally possible. Even for such a pulse signal, the period is determined by dividing the first pulse period B ₁ , the second pulse period B _2, and the third pulse period B ₃ and performing the above-described processing. Is of course possible.

In the above embodiment, the calculation of the half cycle of the amplitude reference is performed from the time when the amplitude waveform exceeds the amplitude reference or the time when the amplitude waveform falls below the amplitude reference as a trigger, It has been described that the first amplitude period A ₁ , the second amplitude period A _2, and the third amplitude period A ₃ are sequentially divided. However, the scope of application of the present invention is not limited to this. Starting from the rising edge of each half cycle or the rising edge of each cycle, the first amplitude period A ₁ , the second amplitude period A _2, and the third amplitude period A ₃ may be divided into _three for each starting point. Is possible. With such a configuration, even if the period of the amplitude waveform gradually shifts, the half period is corrected every half period or every one period, and the half period is corrected to the first amplitude period A ₁ and the second amplitude period A. ₂ and the third amplitude period A ₃ can be divided into three. Therefore, it becomes possible to generate an envelope appropriately.

Further, based on the time when the peak value in the second amplitude period A ₂ is detected, the periods of the first amplitude period A ₁ , the second amplitude period A ₂ and the third amplitude period A ₃ in the next half cycle are corrected. It is also possible to divide into three. That is, the first amplitude period A ₁ and the second amplitude period so that the second amplitude period A ₂ is centered after a predetermined half cycle with respect to the time when the peak value in the second amplitude period A ₂ is detected. The period between A ₂ and the third amplitude period A ₃ can be adjusted and divided into three. Even in such a configuration, even when the period of the amplitude waveform gradually shifts, the half period is corrected every half period or every one period, and the half period is corrected to the first amplitude period A ₁ and the second amplitude period. It becomes possible to divide into A ₂ and the third amplitude period A ₃ . Therefore, it becomes possible to generate an envelope appropriately.

The block diagram which showed typically the schematic structure of the door opening / closing apparatus provided with the envelope generation apparatus which concerns on 1st Embodiment. Diagram showing an example of an attenuation signal Diagram showing one period of the attenuation signal The figure which shows an example of the detection of a peak value, and the production | generation of an envelope The block diagram which showed typically the schematic structure of the door opening / closing apparatus provided with the envelope generation apparatus which concerns on 2nd Embodiment. Diagram showing correction of peak value The block diagram which showed typically the schematic structure of the door opening / closing apparatus provided with the envelope generation apparatus which concerns on 3rd Embodiment. The figure which shows the relationship between the attenuation | damping signal and pulse signal which concern on 3rd Embodiment. The figure which shows an example which the period shift of the attenuation signal has occurred The figure which shows the example of the production | generation of the envelope which concerns on other embodiment

Explanation of symbols

10: vibration detection sensor 20: envelope generation device 21: filter 22: signal detection unit 24: peak value detection unit 27: envelope generation unit 30: determination unit 40: door control unit 100: door opening / closing device

Claims (7)

An envelope generation device that generates an envelope of an amplitude waveform that amplitudes in a predetermined cycle,
A peak value detector for dividing a half cycle of the amplitude waveform into a first amplitude period, a second amplitude period, and a third amplitude period, and detecting a peak value of the amplitude waveform for each second amplitude period;
Of the detected peak values, only the peak value of the upper waveform with respect to the amplitude reference of the amplitude waveform or only the peak value of the lower waveform with respect to the amplitude reference is connected, and at least one of the upper waveform and the lower waveform is connected. An envelope generator for generating an envelope of
An envelope generation apparatus comprising:   The envelope generation device according to claim 1, wherein the first amplitude period, the second amplitude period, and the third amplitude period are equally divided into three.   The envelope is generated based on one of the peak value of the detected upper waveform and the peak value of the detected lower waveform, and the other detected peak value continuous with the one peak value. The envelope generation apparatus according to claim 1, further comprising a correction unit that corrects the other peak value used when performing the processing.   The envelope generation device according to claim 3, wherein the correction unit corrects based on a difference between the detected one peak value and the detected other continuous peak value.   The envelope generator generates the predetermined value when the slope of the envelope generated by connecting only the peak value of the upper waveform or only the peak value of the lower waveform is outside a predetermined range set in advance. The envelope generation device according to any one of claims 1 to 4, wherein the envelope is generated by excluding a peak value that forms an inclination outside the range. A pulse signal generator for generating a pulse signal corresponding to a period of the amplitude waveform calculated from the peak value of the upper waveform and the peak value of the lower waveform;
The half cycle of the pulse signal is divided into a first pulse period, a second pulse period, and a third pulse period, and the peak value of the upper waveform and the peak value of the lower waveform are determined for each second pulse period. A cycle determination unit that determines whether or not it exists,
The envelope generator according to any one of claims 1 to 5, further comprising: A vibration detection sensor for detecting vibration caused by a user's opening / closing command operation on the vehicle door;
An envelope generator according to any one of claims 1 to 6, which generates an envelope of a vibration waveform based on the vibration;
A determination unit that determines whether or not the opening / closing command operation has been performed based on the envelope;
A door opening and closing device.

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