JP6735045B2 - Rotational speed information correction device and rotational speed information correction program - Google Patents

Description

The present invention relates to a rotation speed information correction device and a rotation speed information correction program for correcting noise caused by a joint of a strip tape included in rotation speed information calculated based on a pulse signal from a strip tape wound around a rotating body. Regarding

Patent Document 1 describes a rotary pulse generator. The rotating pulse generator includes a reflective tape mounted on the outer peripheral surface of the rotating body, and a photoelectric sensor that receives the reflected light from the reflective tape. The reflection tape is a tape on which a black-and-white pattern is printed, and includes a high reflection portion made of white and a low reflection portion made of black. The reflective tape is formed such that the length in the longitudinal direction is the same as the outer peripheral length of the rotating body. Then, it is mounted on the outer peripheral surface of the rotating body so as to go around the rotating body without a gap.

JP, 2011-174800, A

By the way, in the case of winding a strip tape around a rotating body and calculating the rotation speed of the rotating body based on the pulse signal from the strip tape to measure the fluctuation of the rotation speed, the rotation pulse generator described in Patent Document 1 is used. In addition, it is difficult to form the reflective tape (strip tape) in the longitudinal direction with the same length as the outer circumference of the rotating body, and it is difficult to mount the strip tape on the outer circumferential surface of the rotating body without any gaps. In some cases, the length in the direction is formed longer than the outer peripheral length of the rotating body, and the strip-shaped tape is wound around the rotating body so that one end side and the other end side of the strip-shaped tape overlap. In this case, a joint portion of the strip tape is formed on the surface of the strip tape, and the length of the reflecting portion of the joint portion (hereinafter referred to as the joint reflecting portion) in the rotation direction tends to be different from the length of other reflecting portions. .. In this state, when the fluctuation data of the rotation speed of the rotating body is detected from the reflection tape and the fluctuation data is sampled, a large fluctuation of the rotation speed (hereinafter referred to as first noise) is caused by the seam reflection portion of the reflection tape. Can occur. Further, due to the influence of a filter or the like at the time of sampling, large noise may occur in the fluctuation data after sampling immediately after the large fluctuation of the rotation speed. In this case, the first noise (large fluctuation of the rotation speed) Immediately after that, a large noise different from the first noise (hereinafter referred to as the second noise) may occur. As described above, when the strip tape is wound around the rotating body and the rotation speed of the rotating body is measured, the first noise is generated due to the seam of the strip tape, and the second noise is generated due to the first noise. This may occur and the seam of the strip tape may have a great influence on the measurement result of the rotation speed.

Therefore, the present invention, a rotational speed information correction device for a rotating body capable of reducing the influence of the seam of the band-shaped tape on the measurement result when the rotational speed of the rotating body is measured by winding the strip-shaped tape around the rotating body, and The purpose is to provide a rotation speed information correction program.

In order to solve the above problems, a first aspect of the present invention is a strip-shaped tape in which high-reflecting portions and low-reflecting portions having different reflectances for light are alternately and repeatedly arranged around a rotating body. Rotation speed information correction for irradiating the tape with light and correcting the rotation speed information including the correspondence between the time and the rotation speed of the rotating body calculated based on the pulse signal corresponding to the reflected light from the strip tape The apparatus includes an average speed calculation means, a threshold value setting means, a correction target period setting means, and a rotation speed correction means. The average speed calculation means calculates the average rotation speed of the correction target information, which is the rotation speed information during at least one rotation of the rotating body. The threshold setting means sets a high speed threshold that is a speed higher than the average rotation speed and a low speed threshold that is a speed lower than the average rotation speed based on the average rotation speed calculated by the average speed calculation means. The correction target period setting means, when the rotation speed of the correction target information increases from the normal range between the low speed threshold and the high speed threshold to outside the normal range from the first speed fluctuation increase exceeding one of the low speed threshold and the high speed threshold, After the first speed fluctuation increase, the correction target period is set from a range outside the normal range to a normal range until a predetermined time after the second speed fluctuation increase time that exceeds one of the thresholds. The rotation speed correction means sets the rotation speed in the correction target period of the correction target information within a range between the rotation speed immediately before the first speed fluctuation increase and the rotation speed immediately after the predetermined time. Correct to.

A second aspect of the present invention is to irradiate the strip-shaped tape with light in a state in which a strip-shaped tape in which high-reflecting portions and low-reflecting portions having different light reflectances are alternately and repeatedly wound around a rotating body. A rotation speed information correction program for correcting rotation speed information including a correspondence relationship between time and rotation speed of the rotating body calculated based on a pulse signal corresponding to light reflected from the strip tape, A rotation speed information correction program for the rotating body to function as an average speed calculation means, a threshold value setting means, a correction target period setting means, and a rotation speed correction means. The average speed calculation means calculates the average rotation speed of the correction target information, which is the rotation speed information during at least one rotation of the rotating body. The threshold setting means sets a high speed threshold that is a speed higher than the average rotation speed and a low speed threshold that is a speed lower than the average rotation speed based on the average rotation speed calculated by the average speed calculation means. The correction target period setting means, when the rotation speed of the correction target information increases from the normal range between the low speed threshold and the high speed threshold to outside the normal range from the first speed fluctuation increase exceeding one of the low speed threshold and the high speed threshold, After the first speed fluctuation increase, the correction target period is set from a range outside the normal range to a normal range until a predetermined time after the second speed fluctuation increase time that exceeds one of the thresholds. The rotation speed correction means sets the rotation speed in the correction target period of the correction target information within a range between the rotation speed immediately before the first speed fluctuation increase and the rotation speed immediately after the predetermined time. Correct to.

In the rotation speed information correction device and the rotation speed information correction program, a band-shaped tape in which high-reflecting portions and low-reflecting portions having different reflectances for light are alternately and repeatedly arranged is wound around the rotating body. For example, a strip-shaped tape having a high reflection portion and a low reflection portion, which are alternately and repeatedly arranged in the longitudinal direction of the strip-shaped tape with the same length (hereinafter, referred to as a predetermined length), is wound around a rotating body, and the seam of the strip-shaped tape is wound. A reflecting portion (hereinafter, referred to as a joint reflecting portion) having a length greatly different from the predetermined length is provided in the portion. The length of the seam reflecting portion may be ½ or less of the predetermined length or twice or more of the predetermined length.

The correction target information, which is the rotation speed information of the rotating body during at least one rotation, includes noise (first noise) caused by the seam reflecting portion. Specifically, when the joint reflection portion is set longer than the predetermined length, the first noise appears in the correction target information as a speed lower (slower) than the rotation speed of other portions, and the joint reflection portion When the length is set shorter than the predetermined length, the first noise appears in the correction target information as a speed higher (faster) than the rotation speed of other portions. In addition, as described above, when the joint reflection portion is set to have a length of ½ or less of the predetermined length or twice or more of the predetermined length, the first noise clearly appears in the correction target information. Since it appears, it is easy to specify the correction target.

In the rotation speed information correction device and the rotation speed information correction program, the average speed calculation means calculates the average rotation speed from the correction target information, and the threshold setting means causes the high speed threshold value higher than the average rotation speed (for example, , Twice the average rotation speed) and a low speed threshold (eg, half the average rotation speed) that is lower than the average rotation speed. When the joint reflecting portion is set longer than the other reflecting portions, the first noise appears from within the normal range to outside the normal range exceeding the low speed threshold, and the joint reflecting portion is set shorter than the other reflecting portions. In this case, the first noise appears from within the normal range to outside the normal range, exceeding the high speed threshold. Therefore, regardless of whether the length of the seam reflecting portion with respect to the other reflecting portion is set to be long or short, the first noise of the seam reflecting portion of the strip tape can be reliably specified.

Further, the correction target period setting means, when the rotation speed of the correction target information increases from the normal range between the low speed threshold value and the high speed threshold value to the outside of the normal range when the first speed fluctuation exceeds one of the low speed threshold value and the high speed threshold value. Thus, after the first speed fluctuation increase, a correction target period is set from a time outside the normal range to a normal range until a predetermined time after a second speed fluctuation increase time that exceeds one of the thresholds. That is, the correction target period setting means sets the correction target period from the time when the first speed fluctuation increases to a predetermined time after the time when the second speed fluctuation increases. Then, the rotation speed correction means corrects the rotation speed of the correction target period in the correction target information. Therefore, it is possible to reliably correct the first noise (noise from the time when the first speed fluctuation increases to the time when the second speed fluctuation increases) due to the joint reflection portion of the strip tape. Further, for example, even when a large noise is generated immediately after a large change in the rotation speed due to the influence of a filter during A/D conversion, when the second speed change is increased (when the rotation speed is greatly changed). It is possible to correct the noise (second noise) generated immediately after. When a large noise is generated immediately after a large change in the rotation speed, the noise generated immediately after the first speed fluctuation increase (when the rotation speed is greatly changed) is included in the first noise. It can be corrected together with one noise.

Further, the rotation speed correction means sets the rotation speed of the correction target period of the correction target information within a range between the rotation speed immediately before the first speed fluctuation increase and the rotation speed immediately after the predetermined time. Correct to the rotation speed. Therefore, the first noise of the joint reflection portion of the strip tape and the second noise immediately after it are corrected to a value close to the rotation speed calculated from the pulse signal of the reflection portion of the portion other than the joint reflection portion of the strip tape. You can

Therefore, it is possible to reduce the influence of the seam of the strip tape on the measurement result when the rotation speed of the rotary body is measured by winding the strip tape around the rotary body.

According to the present invention, it is possible to reduce the influence of the seam of the strip tape on the measurement result when the rotation speed of the rotary body is measured by winding the strip tape around the rotary body.

It is a typical block diagram of the apparatus which detects the rotation speed of a propeller shaft. It is a schematic diagram of a strip tape. It is explanatory drawing of a joint part, (a) shows the state before applying a color, (b) shows the state after applying a color, respectively. It is a fluctuation waveform diagram of the sampled rotation speed. It is an enlarged view of the principal part of FIG. 4, (a) shows the state before correction, (b) shows the state after correction, respectively. It is a flowchart which shows a rotation speed correction process.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the rotation speed information correction device 10 according to the present embodiment is a computer, and is provided on a propeller shaft (rotating body) 4 for transmitting the power of a four-cylinder engine 2 of a vehicle 1 to wheels 3. When the rotation speed of the propeller shaft 4 is measured by winding a strip-shaped reflection tape (strip tape) 5, the reflection tape included in the information of the rotation speed of the propeller shaft 4 (hereinafter referred to as rotation speed information) which is the measurement result. Unnecessary information (noise) due to the joint of No. 5 is corrected.

The strip tape 5 is wound around the propeller shaft 4 along the rotation direction of the propeller shaft 4. A pulse detector 6 is arranged near the surface of the reflective tape 5 wound around the propeller shaft 4. The pulse detector 6 irradiates the reflective tape 5 with light, detects the reflected light, and generates a pulse signal corresponding to the detected reflected light. The pulse detector 6 is connected to an F/V (frequency/voltage) converter 7, and the F/V converter 7 is connected to a rotation speed information correction device 10. The rotation speed information correction device 10 may be a dedicated device or a general-purpose personal computer.

As shown in FIG. 2, FIG. 3A and FIG. 3B, the reflective tape 5 includes a white highly reflective portion 13 having a high reflectance for light and a black low reflective portion 14 having a low reflectance for light. Have and. The high reflection portions 13 and the low reflection portions 14 are alternately and repeatedly arranged in the longitudinal direction of the reflection tape 5 with the same width L1 (hereinafter, referred to as a predetermined length L1). When the reflection tape 5 is wound around the propeller shaft 4, the one end side of the reflection tape 5 is fixed to the propeller shaft 4 by sticking it to the surface of the propeller shaft 4, and then the reflection tape 5 is wrapped around the other end side of the reflection tape 5. It is fixed by stacking it on the surface of. That is, the seam of the reflection tape 5 (the other end 8 of the reflection tape 5) is present on the surface of the reflection tape 5. A low reflection portion 14a (a low reflection portion on the left side of the alternate long and short dash line 9 in FIG. 3A) is arranged on the other end of the reflection tape 5. As shown in FIG. 3A, the high reflection portion 13a on one end side of the reflection tape 5 (the high reflection portion on the right side of the alternate long and short dash line 9 in FIG. 3A) has the low reflection portion 14a on the other end. Overlapping from the top, a partial region 15 of the high reflection part 13a on one end side is exposed on the surface of the reflection tape 5. The width 1 of the region 15 of the high reflection portion 13a is shorter than the predetermined length L1. A seam reflecting portion 16 having a width satisfying a predetermined condition is provided at the seam portion of the reflective tape 5. The predetermined condition is a length that is half the predetermined length L1 or less, or twice the length or more. For example, when the width l of the region 15 of the high reflection portion 13a of the reflective tape 5 is equal to or less than half the predetermined length L1, the region 15 is used as the seam reflection portion 16 and the width l of the region 15 is set. Is longer than half of the predetermined length L1, the region 15 is painted black with the same color as the low reflection part 14, and the low reflection part 14a at the other end and the high reflection part 13a painted black. The region 15 and the low reflection part 14b adjacent to the high reflection part 13a on the opposite side of the low reflection part 14a form a seam reflection part 16 having a width L2 longer than the predetermined length L1. In the present embodiment, the width 1 of the region 15 is longer than the half length of the predetermined length L1, and as shown in FIG. 3B, the seam reflecting portion 16 has the low reflecting portion 14a at the other end (see FIG. 3(a)), a region 15 of the high reflection part 13a painted in black (see FIG. 3(a)), and a low reflection part 14b adjacent to the high reflection part 13a on the side opposite to the low reflection part 14a. (See FIG. 3A), and the width L2 of the seam reflecting portion 16 is twice or more the predetermined length L1. In this embodiment, the seam reflecting portion 16 is provided on the low reflecting portion 14 side having a low reflectance for light, but may be provided on the high reflecting portion 13 side having a high reflectance for light. In the present embodiment, the region 15 of the high reflection part 13a is painted black to provide the seam reflection part 16 having a length twice or more the predetermined length L1. However, the present invention is not limited to this. Instead, for example, a seam reflecting portion 16 having a length twice or more the predetermined length L1 may be provided by sticking a seal having the same reflectance.

When measuring the rotation speed of the propeller shaft 4, the engine 2 is driven to rotate the propeller shaft 4, a pulse signal corresponding to the reflected light from the reflection tape 5 is generated by the pulse detector 6, and the pulse signal is generated. The F/V converter 7 performs F/V conversion, and the F/V converted analog voltage is sampled by the rotation speed information correction device 10 at a predetermined sampling frequency.

As shown in FIG. 4, the rotation speed information of the propeller shaft 4 sampled by the rotation speed information correction device 10 includes a correspondence relationship between the rotation speed (rpm) of the propeller shaft 4 and time (s). Since there is one seam of the reflective tape 5 on the outer periphery of the propeller shaft 4 and the seam reflecting portion 16 is provided at the seam portion, the rotation speed information of the propeller shaft 4 indicates that the propeller shaft 4 has rotated once. In addition, the noise 31 (hereinafter, referred to as the first noise 31) caused by the joint reflection portion 16 of the reflection tape 5 is generated once. In the present embodiment, the width L2 of the seam reflecting portion 16 is twice or more the predetermined length L1. Therefore, the first noise 31 caused by the seam reflecting portion 16 is a portion other than the seam reflecting portion 16. The rotation speed information shows that the rotation speed is much lower (slower) than the rotation speed of the. When the rotational speed in the rotational speed information of the propeller shaft 4 suddenly decreases is the time t1 (when the first speed fluctuation increases) t1 (hereinafter referred to as the time t1 when the seam invades) into the seam reflecting portion 16, The time when the rotational speed rapidly increases after the time t1 when the seam invades is when the vehicle exits the seam reflecting portion 16 (when the second speed fluctuation increases) t2 (hereinafter referred to as the time t2 when the seam escapes). The rotation speed information from time t1 to time t2 at which the seam escapes is the first noise 31 generated by the seam reflecting portion 16. Further, as shown in FIG. 5A, in the rotation speed information of the propeller shaft 4, a large noise is generated immediately after a large change in the rotation speed due to the influence of the filter at the time of sampling. Specifically, noise (included in the first noise 31) is generated immediately after the seam intrusion t1, and noise 32 (hereinafter, referred to as second noise 32) is generated immediately after the seam escape t2. It should be noted that FIG. 4 shows rotational speed information for two revolutions of the propeller shaft 4. Further, when the seam reflecting portion 16 is set shorter than the predetermined length L1, the first noise 31 is rotational speed information as a speed (higher) that is significantly higher (higher) than the rotational speed of the portion other than the seam reflecting portion 16. Appears in.

As shown in FIG. 1, the rotation speed information correction device 10 includes a storage unit 11 and a CPU 12, and is rotation speed information for one rotation of the propeller shaft 4 among the sampled rotation speed information of the propeller shaft 4. The noise (first noise 31 and second noise 32) of the correction target information is corrected.

The storage unit 11 of the rotation speed information correction device 10 is configured by a recording medium such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The storage unit 11 stores a rotation speed correction program (rotation speed information correction program) for executing the rotation speed correction process. Further, in the storage section 11, a data storage area in which the sampled rotational speed information of the propeller shaft 4, various data, and the like are readable and writable is set in advance. In addition to the data storage area, the storage unit 11 also functions as a program development area, a temporary storage area for the calculation result of the CPU 12, and the like.

The CPU 12 of the rotation speed information correction device 10 executes the rotation speed correction process in accordance with the rotation speed correction program stored in the storage unit 11, and thereby the average speed calculation unit (average speed calculation unit) 17 and the threshold setting unit (threshold setting). Functioning unit 18, a correction target period setting unit (correction target period setting unit) 19, and a rotation speed correction unit (rotation speed correction unit) 20.

The average speed calculator 17 calculates the average rotation speed N of the correction target information of the propeller shaft 4. That is, the average speed calculation unit 17 calculates the average rotation speed N of the correction target information that is the rotation speed information during at least one rotation of the propeller shaft 4.

The threshold setting unit 18 sets a speed that is twice the average rotation speed N of the correction target information calculated by the average speed calculation unit 17 as a high speed threshold Nh, and sets a speed that is half (0.5 times) the average rotation speed N. Set as the low speed threshold Nl. That is, the threshold setting unit 18 is based on the average rotation speed N of the correction target information calculated by the average speed calculation unit 17, a high speed threshold Nh that is a speed (higher) than the average rotation speed N, and the average rotation speed N. A low speed threshold Nl that is a slower (lower) speed is set. The high speed threshold Nh is set to a value that is reliably higher than the rotation speed of other parts other than the seam reflecting portion 16, and the low speed threshold Nl is more sure than the rotation speed of other parts other than the seam reflecting portion 16. A slow value is set. That is, in the correction target information, the rotation speed within the range between the low speed threshold Nl and the high speed threshold Nh (within the normal range) is the rotation speed of the portion other than the seam reflecting portion 16, and is the low speed threshold Nl. The rotation speed outside the range (outside the normal range) between the high speed threshold Nh and the high speed threshold Nh can be specified as the first noise 31 caused by the seam reflecting portion 16. For example, in the correction target information, the rotation speed that is higher than the high speed threshold Nh or the rotation speed that is lower than the low speed threshold Nl can be specified as the first noise 31 caused by the seam reflecting portion 16. In addition, in the present invention, the normal range means a range in which at least noise (the first noise 31 and the second noise 32) caused by the seam reflecting portion 16 is not generated.

The correction target period setting unit 19 sequentially compares the low speed threshold Nl and the high speed threshold Nh with the rotation speed of the correction target information over time from the beginning of the correction target information (measurement start side). The time t1 that exceeds the low speed threshold Nl and exceeds Nl or exceeds the high speed threshold Nh and is higher than the high speed threshold Nh is specified as the joint entry time t1. Further, when the rotation speed becomes lower than the low speed threshold Nl at the time t1 when the seam enters, after the time t1 at the time of the seam entry, the seam escape time t2 at which the rotation speed becomes higher than the high speed threshold Nh is specified, and the time t1 at the time the seam enters When the rotation speed becomes higher than the high speed threshold Nh, the joint exit time t2 at which the rotation speed becomes lower than the low speed threshold Nl is specified after the seam intrusion time t1. In the present embodiment, the correction target period setting unit 19 specifies the time when the rotation speed of the correction target information becomes lower than the low speed threshold value (one threshold value) Nl as the seam intrusion time t1 and rotates after the seam intrusion time t1. The time when the speed becomes higher than the high speed threshold Nh is specified as the seam escape time t2. Then, the correction target period setting unit 19 sets the correction target period T based on the time from the joint entry time t1 to the joint exit time t2. Specifically, the correction target period setting unit 19 calculates a time (hereinafter, referred to as a correction time) that is 1.5 times as long as the time from the time t1 when the seam enters to the time t2 when the seam exits, and the correction time is calculated from the time t1 when the seam enters. A period up to a predetermined time t3 (hereinafter referred to as correction end time t3) after is set as a correction target period T. That is, the correction target period setting unit 19 is a joint where the rotation speed of the correction target information exceeds the threshold of the low speed threshold Nl or the high speed threshold Nh from within the normal range between the low speed threshold Nl and the high speed threshold Nh to outside the normal range. The period from the time t1 at the time of intrusion to the time t3 at the time of correction after the time t1 at the time of seam intrusion to the time within the normal range from the time out of the normal range to the time t3 at the end of correction after the time t2 at the time of seam exit exceeding one of the above thresholds is set as the correction target period T .. In the present embodiment, the correction time is 1.5 times the time from the time t1 when the seam enters to the time t2 when the seam exits, but the time is not limited to this, and the correction time is the time when the seam enters. The time may be longer than the time from t1 to t2 at the seam escape and shorter than twice the time from t1 at the seam ingress to t2 at the seam escape.

The rotation speed correction unit 20 corrects the rotation speed of the correction target period T in the correction target information. Specifically, the rotation speed correction unit 20 determines the rotation speed of the first half of the time from the time t1 at the time of entering the joint to the time t2 at the time of exiting the seam (rotation speed in the first half) immediately before the time t1 at the time of entering the seam. Corrected to the speed, the rotational speed of the latter half of the time from the time t1 when the seam invades to the time t2 when the seam exits (the latter half of the speed) and the rotational speed from the time t2 when the seam exits to the time t3 when the correction ends The rotation speed is corrected immediately after time t3. That is, the rotation speed correction unit 20 sets the rotation speed of the correction target period T of the correction target information within a range between the rotation speed immediately before the joint intrusion time t1 and the rotation speed immediately after the correction end time t3. Correct to the rotation speed.

Next, the rotation speed correction processing executed by the CPU 12 of the rotation speed information correction device 10 will be described based on the flowchart of FIG.

When this process is started, the CPU 12 first calculates the average rotation speed N of the correction target information (step S1), and sets the low speed threshold Nl and the high speed threshold Nh based on the calculated average rotation speed N (step S1). S2). Next, the CPU 12 specifies the joint entry time t1 and the joint exit time t2, and determines the correction end time t3 after the joint exit time t2 based on the time from the joint entry time t1 to the joint exit time t2. A period from the time t1 when the seam enters to the time t3 when the correction ends is set as the correction target period T (step S3). Finally, the CPU 12 sets the rotation speed of the correction target period T of the correction target information to a rotation speed within a range between the rotation speed immediately before the joint intrusion time t1 and the rotation speed immediately after the correction end time t3. It is corrected (step S4).

In the rotational speed information correction device 10 configured as described above, the width L2 of the seam reflecting portion 16 is twice or more the predetermined length L1. Therefore, the first noise 31 clearly appears in the correction target information. .. Therefore, it is easy to identify the first noise 31 and the second noise 32. Further, even when the width L2 of the seam reflecting portion 16 is set to be half or less of the predetermined length L1, the first noise 31 clearly appears in the correction target information, so that the first noise 31 and the second noise 32 are generated. Easy to identify.

Further, the average speed calculation unit 17 calculates the average rotation speed N from the correction target information, and the threshold setting unit 18 calculates a high speed threshold Nh that is a speed higher than the average rotation speed N and a speed lower than the average rotation speed N. The low speed threshold Nl is set. Therefore, when the joint reflecting portion 16 is set longer than the predetermined length L1 as in the present embodiment, the first noise 31 appears at a speed slower than the low speed threshold Nl and shorter than the predetermined length L1. When set, the first noise 31 appears at a speed faster than the high speed threshold Nh. Therefore, regardless of whether the width L2 of the seam reflecting portion 16 with respect to the width of the other reflecting portion (the predetermined length L1) is set to be long or short, the first noise 31 of the seam reflecting portion 16 of the reflective tape 5 can be reliably specified. can do.

In addition, the correction target period setting unit 19 specifies the joint entry time t1 and the joint exit time t2 of the first noise 31, and based on the time from the joint entry time t1 to the joint exit time t2, the correction target period setting unit 19 determines that The subsequent correction end time t3 is obtained, and the period from the joint intrusion time t1 to the correction end time t3 is set as the correction target period T. Then, the rotation speed correction unit 20 corrects the rotation speed of the correction target period T in the correction target information. Therefore, the first noise 31 due to the seam reflecting portion 16 of the reflective tape 5 can be surely corrected, and the second noise 32 generated immediately after the seam escape time t2 (when the rotational speed largely changes) is corrected. be able to. Note that the noise generated immediately after the time t1 when the seam enters (when the rotational speed largely changes) is included in the first noise 31, and thus can be corrected together with the first noise 31.

Further, the rotation speed correction unit 20 sets the rotation speed of the correction target period T of the correction target information within a range between the rotation speed immediately before the joint intrusion time t1 and the rotation speed immediately after the correction end time t3. Correct to the rotation speed. Therefore, the first noise 31 of the seam reflecting portion 16 of the reflective tape 5 and the second noise 32 immediately after it are close to the rotation speed calculated from the pulse signals of the reflecting portions 13 and 14 of the portions other than the seam reflecting portion 16. It can be corrected to a value.

Therefore, it is possible to reduce the influence of the seam of the reflection tape 5 on the measurement result when the rotation speed of the propeller shaft 4 is measured by winding the reflection tape 5 around the propeller shaft 4.

In the present embodiment, among the rotation speed information of the propeller shaft 4, the rotation speed information for one rotation of the propeller shaft 4 is the correction target information, but the correction target information is not limited to this. The rotation speed information during one rotation may be the correction target information. For example, when the rotation speed information during the n revolutions (n≧1) of the propeller shaft 4 is the correction target information, the low speed threshold Nl and the high speed threshold Nh are set based on the average rotation speed N of the entire correction target information. However, the first noise 31 and the second noise 32 at n points in the correction target information may be corrected, or for each rotation speed information of one rotation of the propeller shaft 4 in the correction target information. Alternatively, the rotation speed correction process may be executed.

Further, in the present embodiment, the correction time when setting the correction target period T is longer than the time from the joint entry time t1 to the joint exit time t2, and is the time from the joint entry time t1 to the joint exit time t2. Although the time is shorter than twice the time, the correction time may be longer than twice the time from the joint entry time t1 to the joint exit time t2.

Further, in the present embodiment, the correction target period setting unit 19 calculates the correction time (in this embodiment, 1.5 times the time) based on the time from the time t1 when the seam enters to the time t2 when the seam exits, and the seam is calculated. Although the period from the intrusion time t1 to the correction end time t3 after the correction time has elapsed is set as the correction target period T, the method of setting the correction target period T is not limited to this, and various correction methods may be used. The target period T can be set. For example, the correction target period setting unit 19 calculates the additional time (for example, 0.5 times the time) based on the time from the joint entry time t1 to the joint exit time t2, and the addition time elapses from the joint exit time t2. The correction end time t3 may be specified, and the period from the joint intrusion time t1 to the correction end time t3 may be set as the correction target period T.

Further, in the present embodiment, the rotation speed correction unit 20 corrects the rotation speed in the first half of the time from the time t1 when the seam enters to the time t2 when the seam exits to the rotation speed immediately before the time t1 when the seam enters to make the seam intrusion. The rotational speed in the latter half of the time from the time t1 to the seam escape time t2 and the rotational speed from the seam escape time t2 to the correction end time t3 are corrected to the rotation speed immediately after the correction end time t3, but the present invention is not limited to this. Not something. The rotational speed from the time t1 at the time of entering the seam after correction to the time t3 at the time of correction end may be any rotational speed within the range between the rotational speed immediately before the time t1 at the time of seam intrusion and the rotational speed immediately after the time t3 at the end of correction. For example, it may be an average rotation speed of the rotation speed immediately before the seam intrusion t1 and the rotation speed immediately after the correction end time t3 (rotational speed indicated by a dashed line 21 in FIG. 5A), Alternatively, the rotational speed (which linearly connects the joint entry time t1 and the correction end time t3) changes proportionally from the joint entry time t1 to the correction end time t3 (rotation indicated by a chain double-dashed line 22 in FIG. 5A). Speed) or the like.

Further, in the present embodiment, the predetermined condition for the width of the seam reflecting portion 16 is set to be half the length of the predetermined length L1 or less, or twice the length or more, but the present invention is not limited to this. The predetermined condition can be set so that the first noise 31 has a width that clearly appears in the correction target information.

Further, in the present embodiment, the high speed threshold Nh is set to twice the average rotation speed N and the low speed threshold Nl is set to half the average rotation speed N. However, the present invention is not limited to this, and the seam reflection portion is not limited to this. It is sufficient that the first noise 31 caused by 16 can be reliably identified, and the speed of the width of the joint reflection portion 16 of the reflection tape 5 can be set according to the predetermined condition. For example, when the predetermined condition of the width of the seam reflecting portion 16 of the reflective tape 5 is set to be one third or less of the predetermined length L1 or three times or more, the high speed threshold Nh is averaged. The speed may be three times the rotation speed N and the low speed threshold Nl may be one third of the average rotation speed N.

Further, in the present embodiment, the high reflection portion 13 is white and the low reflection portion 14 is black. However, the present invention is not limited to this, and the reflectance for light may be clearly different. For example, the high-reflecting portion 13 and the low-reflecting portion 14 may be provided in other colors (colors other than black and white) having distinctly different light reflectances, or surface treatments having clearly different light reflectances may be reflected. The high reflection portion 13 and the low reflection portion 14 may be provided by applying the tape 5.

Further, in the present embodiment, the F/V converter 7 is connected to the rotation speed information correction device 10 to sample the rotation speed information of the propeller shaft 4, and the rotation speed information correction device 10 according to the present invention. Although the same device (computer) is used, it is not limited to this. For example, the F/V converter 7 is connected to a device different from the rotation speed information correction device 10, the rotation speed information of the propeller shaft 4 is sampled by the device, and the sampled rotation speed information is stored in a memory or the like. The rotation speed information correction device 10 may execute the rotation speed correction processing after the rotation speed information correction device 10 captures the rotation speed information via a storage medium or a network.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the contents of the above-described embodiment, and can of course be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operation techniques and the like made by those skilled in the art based on this embodiment are included in the scope of the present invention.

For example, in the above-described embodiment, the rotation speed of the propeller shaft 4 (rotating body) is measured and the noise included in the rotation speed information of the propeller shaft 4 that is the measurement result is corrected, but the rotating body is not limited to the above. Not something.

4: Propeller shaft (rotating body)
5: Reflective tape (strip tape)
10: Rotational speed information correction device 13: High reflection part 14: Low reflection part 17: Average speed calculation part (average speed calculation means)
18: Threshold setting unit (threshold setting means)
19: Correction target period setting unit (correction target period setting means)
20: Rotational speed correction unit (rotational speed correction means)

Claims (2)

Irradiate light on the strip tape in a state in which a strip tape in which high-reflecting portions and low-reflecting portions having different reflectances with respect to light are alternately and repeatedly arranged around a rotating body, and reflect light from the strip-shaped tape. A rotation speed information correction device for correcting rotation speed information including a correspondence relationship between time and rotation speed of the rotating body calculated based on a corresponding pulse signal,
Average speed calculation means for calculating an average rotation speed of correction target information which is rotation speed information during at least one rotation of the rotating body,
Based on the average rotation speed calculated by the average speed calculation means, a high-speed threshold that is a speed higher than the average rotation speed, and a threshold setting means that sets a low-speed threshold that is a speed lower than the average rotation speed,
When the rotation speed of the correction target information increases from the normal range between the low speed threshold and the high speed threshold to outside the normal range from the first speed fluctuation increase that exceeds one of the low speed threshold and the high speed threshold, (1) After the speed fluctuation is increased, the correction target period is set from the outside of the normal range to the normal range until a predetermined time after the second speed fluctuation is increased exceeding the one threshold value. Means and
The rotation speed of the correction target period in the correction target information is corrected to a rotation speed within a range between the rotation speed immediately before the first speed fluctuation increase and the rotation speed immediately after the predetermined time. A rotation speed information correction device for a rotating body, comprising: a rotation speed correction means. Irradiate light on the strip tape in a state in which a strip tape in which high-reflecting portions and low-reflecting portions having different reflectances with respect to light are alternately and repeatedly arranged around a rotating body, and reflect light from the strip-shaped tape. A rotation speed information correction program for correcting rotation speed information including a correspondence relationship between time and rotation speed of the rotating body calculated based on a corresponding pulse signal,
Computer,
Average speed calculation means for calculating an average rotation speed of correction target information which is rotation speed information during at least one rotation of the rotating body,
Based on the average rotation speed calculated by the average speed calculation means, a threshold setting means for setting a high-speed threshold that is a speed higher than the average rotation speed, and a low-speed threshold that is a speed lower than the average rotation speed,
When the rotation speed of the correction target information increases from the normal range between the low speed threshold and the high speed threshold to outside the normal range from the first speed fluctuation increase that exceeds one of the low speed threshold and the high speed threshold, (1) After the speed fluctuation is increased, the correction target period is set from the outside of the normal range to the normal range until a predetermined time after the second speed fluctuation is increased exceeding the one threshold value. And a rotation speed in the correction target period of the correction target information, which is within a range between the rotation speed immediately before the first speed fluctuation increase and the rotation speed immediately after the predetermined time. Rotation speed correction means for correcting
A rotation speed information correction program for the rotating body to function as a.

Images