JP2015129569A - Infinity variable transmission operation state estimation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infinity variable transmission operation state estimation device capable of accurately estimating a change width of a phase at a time of a swing motion of a swing link in response to the rotation of a rotation diameter regulation mechanism.SOLUTION: An infinity variable transmission operation state estimation device comprises: envelope detection units 82a and 82b generating an envelope detection signal of a maximal peak value and an envelope detection signal of a minimal peak value of a phase signal in response to a phase of a swing link, respectively; a differential signal generation unit 83 generating a differential signal between the two detection signals; and a differential correction signal generation unit 84 generating a differential correction signal obtained by correcting the differential signal at least in response to a rotational velocity of an input unit of an infinity variable transmission, and estimates a change width of the phase of the swing link on the basis of the differential correction signal.

Description

  The present invention relates to an apparatus for estimating an operation state of a continuously variable transmission of a four-bar linkage mechanism type using a lever crank mechanism.

  Conventionally, an input shaft, which is a hollow shaft-like input portion to which driving force from a driving source for traveling such as an engine is transmitted, an output shaft having a rotation center axis parallel to the rotation center axis of the input portion, and a plurality of levers A four-bar linkage mechanism type continuously variable transmission including a crank mechanism is known (see, for example, Patent Document 1).

  In the continuously variable transmission described in Patent Document 1, the lever crank mechanism includes a rotation radius adjustment mechanism that can adjust a rotation radius and can rotate about a rotation center axis of an input unit, and a swing supported by an output shaft. The moving link and one end are rotatably fitted to the turning radius adjusting mechanism, and the other end is connected to a swinging end of the swinging link. The lever crank mechanism converts the rotational motion of the turning radius adjusting mechanism into the swing motion of the swing link.

  Between the swing link and the output shaft, the swing link is fixed with respect to the output shaft when the swing link is about to rotate relative to the output shaft about the rotation center axis of the output shaft. In addition, a one-way clutch is provided as a one-way rotation prevention mechanism that idles the swing link with respect to the output shaft when attempting to rotate relative to the other side.

  The turning radius adjustment mechanism is a disc-shaped cam part that rotates integrally with the input part in a state of being eccentric with respect to the rotation center axis of the input part, and is rotatable to the cam part in a state of being eccentric with respect to the cam part. The rotating part is fitted externally, the pinion shaft is provided so that a plurality of pinions are rotated together in the axial direction, and an adjustment drive source.

  The rotating part is provided with a receiving hole for receiving the cam part at a position eccentric from the center thereof. Internal teeth are formed on the inner peripheral surface of the receiving hole.

  The pinion shaft is disposed concentrically with the rotation center axis of the input unit in the input unit, and is rotatable relative to the input unit by a driving force from an adjustment driving source. Further, external teeth are provided on the outer peripheral surface of the pinion.

  By the way, the hollow shaft-shaped input part is formed with a notch hole that is located in a direction opposite to the eccentric direction of the cam part with respect to the rotation center axis of the input part and communicates the inner peripheral surface with the outer peripheral surface. ing.

  And the external tooth of a pinion is exposed from the notch hole of an input part, and meshes with the internal tooth formed in the internal peripheral surface of the receiving hole of a rotation part.

  When the rotational speeds of the input unit and the pinion shaft are the same, the rotational radius of the rotational radius adjusting mechanism, that is, the amount of eccentricity is maintained. When the rotational speeds of the input unit and the pinion shaft are different, the rotational radius of the rotational radius adjusting mechanism, that is, the amount of eccentricity is changed.

  Therefore, this turning radius adjustment mechanism controls the rotation speed of the output shaft relative to the rotation speed of the input section by changing the rotation radius, thereby changing the swing width of the swing end of the swing link, and thus the gear ratio. To do.

  In this continuously variable transmission, when the turning radius adjusting mechanism is rotated by rotating the input section, one end of the connecting rod rotates and swings connected to the other end of the connecting rod. The link swings. Since the swing link is pivotally supported on the output shaft via the one-way clutch, the rotational driving force (torque) is transmitted to the output shaft only when rotating on one side with respect to the output shaft.

  In addition, the cam portions are set so that the phases thereof are different from each other, and the plurality of cam portions make a round in the circumferential direction of the input portion. For this reason, the connecting rods externally fitted to the respective turning radius adjusting mechanisms allow the respective oscillating links to transmit torque to the output shaft in order so that the output shaft can be smoothly rotated.

  In this continuously variable transmission, when the output shaft is twisted when torque is transmitted, the torque corresponding to the twist is stored.

  When the torque for the twist is stored, the torque for the twist is transmitted to the output shaft from the state in which the torque is transmitted when the angular speed of the swing link falls below the rotational speed of the output shaft. After the state, the state shifts to a state where torque is not transmitted.

  Also, in this continuously variable transmission, the cumulative number of rotations of the input unit and the cumulative number of rotations of the pinion shaft are counted, and the rotational radius of the rotational radius adjusting mechanism is estimated using the difference between them, based on the rotational radius. The torque transmitted to the output shaft is estimated.

JP 2012-251608 A Japanese Patent No. 3241111 Japanese Patent Laid-Open No. 10-276043

  In a continuously variable transmission such as found in Patent Document 1, the change width of the phase of the swinging link that swings with the rotation of the turning radius adjusting mechanism (from the dead end to the other end of the swinging motion of the swinging link). The phase change amount up to a point) basically corresponds to the turning radius of the turning radius adjusting mechanism.

  Therefore, as can be seen in Patent Document 1, if the rotation radius of the rotation radius adjusting mechanism is estimated, basically, the change width of the phase of the swing link can be estimated from the estimated value of the rotation radius. is there.

  However, even if the turning radius of the turning radius adjusting mechanism is constant, there may be some variation in the change width of the swing link phase due to the elasticity of the one-way clutch. For this reason, the gear ratio of the continuously variable transmission or the state of torque transmission from the input unit to the output shaft is controlled to a desired state with high accuracy, or the presence or absence of abnormal operation of the continuously variable transmission is appropriately detected. In addition to estimating the turning radius of the turning radius adjusting mechanism, it is possible to accurately estimate the actual change width of the phase of the swing link accompanying the rotation of the turning radius adjusting mechanism. Is considered desirable.

  In this case, for example, a vibration waveform signal corresponding to a change in phase during the rocking motion of the rocking link is generated using an appropriate sensor, and the difference between the maximum peak value and the minimum peak value of the vibration waveform signal is determined. It is conceivable to estimate the phase change width of the swing link based on the above.

  In this case, in order to be able to specify the difference between the maximum peak value and the minimum peak value of the signal of the vibration waveform in real time, the detection signal and the minimum peak value of the envelope on the maximum peak value side of the signal It is conceivable that the detection signal of the envelope on the side is generated by an envelope detection circuit used in an AM signal (amplitude modulation signal) demodulation circuit or the like, and the voltage difference between these detection signals is sequentially obtained. Note that the envelope detection circuit is a circuit as shown in Patent Documents 2 and 3, for example.

  However, in a continuously variable transmission driven by a driving source for driving such as an engine, the rotational speed of its input section generally varies in a wide range, so that it corresponds to the phase change during the swinging motion of the swinging link. The frequency of the vibration waveform signal also varies over a wide range.

  Also, the timing of the voltage value of the signal of the vibration waveform deviates from the timing when the maximum peak value and the timing when it becomes the minimum peak value, and the deviation amount (time difference) of the timing is determined by the input of the continuously variable transmission. It varies in a wide range according to the rotation speed.

  For this reason, the instantaneous instantaneous voltage difference between the detection signal of the envelope on the maximum peak value side of the vibration waveform signal and the detection signal of the envelope on the minimum peak value side is the actual maximum peak of the signal of the vibration waveform. An error is likely to occur for the difference between the value and the minimum peak value.

  The present invention has been made in view of such a background, and is a continuously variable transmission capable of accurately estimating the change width of the phase during the swinging motion of the swinging link accompanying the rotation of the turning radius adjusting mechanism. An object is to provide an operation state estimation device.

In order to achieve the above object, the continuously variable transmission operating state estimating device of the present invention includes an input unit to which the driving force of a driving source for traveling is transmitted,
An output shaft having a rotation center axis parallel to the rotation center axis of the input unit;
A turning radius adjusting mechanism capable of adjusting a turning radius and rotatable about a rotation center axis of the input unit, a swing link pivotally supported by the output shaft, the turning radius adjusting mechanism, and the swing link; A lever for connecting the lever, and a lever crank mechanism for converting the rotational motion of the rotational radius adjusting mechanism into the swing motion of the swing link;
When the swing link is about to rotate to one side with respect to the output shaft about the rotation center axis of the output shaft, the swing link is fixed to the output shaft and is about to rotate to the other side. A one-way rotation prevention mechanism that idles the swing link with respect to the output shaft when
A transmission case that houses the lever crank mechanism and the one-way rotation prevention mechanism,
The swing link is an operating state estimation device for a continuously variable transmission having a swing end connected to the connecting rod and an annular portion supported by the output shaft,
It has a sensor whose output changes according to the change of the phase of the swing link during the swinging motion of the swing link, and the output from the sensor changes monotonously with respect to the change of the phase of the swing link A phase detector that generates a phase signal that is a voltage signal exhibiting
A maximum side envelope detector and a minimum side envelope detector that respectively generate a detection signal indicating an envelope on the maximum peak value side and a detection signal indicating an envelope on the minimum peak value side of the phase signal generated by the phase detection unit. And
A differential signal generation unit that generates a differential signal indicating a voltage value of a difference between the detection signal generated by the maximum side envelope detection unit and the detection signal generated by the minimum side envelope detection unit;
The difference which produces | generates the difference correction signal which has a voltage value according to the change width of the phase at the time of the rocking | fluctuation movement of the said rocking | fluctuation link by correct | amending the magnitude | size of the voltage value of the difference signal which the said difference signal generation part produced | generated. A correction signal generation unit;
A phase change width estimation processing unit that estimates a phase change width during the swing motion of the swing link from the voltage value of the difference correction signal generated by the difference correction signal generation unit;
The difference correction signal generation unit corrects the magnitude of the voltage value of the difference signal so as to change the degree of correction of the voltage value of the difference signal according to at least the rotation speed of the input unit. It is configured (first invention).

  In the continuously variable transmission, when the rotation radius of the rotation radius adjusting mechanism is adjusted to a non-zero value, the swing link reciprocally swings with the rotation of the input unit. For this reason, the phase (swing angle) of the swing link vibrates.

  At this time, the phase signal generated by the phase detection unit exhibits a monotonic change (monotonic increase or monotonic decrease) with respect to a change (increase or decrease) in the phase of the swing link. For this reason, the phase signal is a signal of a vibration waveform whose voltage value vibrates with the reciprocal swing of the swing link.

  Then, a detection signal indicating the maximum peak value envelope of the phase signal of the vibration waveform (hereinafter sometimes referred to as a maximum side envelope detection signal) and a detection signal indicating the minimum peak value envelope (hereinafter referred to as the minimum side). Envelope detection signal is sometimes generated by the maximum side envelope detection unit and the minimum side envelope detection unit.

  In this case, the magnitude of the voltage value of the maximum side envelope detection signal is attenuated by a certain time constant (detection time constant) after reaching the maximum peak value of the phase signal. Similarly, the magnitude of the voltage value of the minimum side envelope detection signal attenuates with a certain time constant (detection time constant) after reaching the minimum peak value of the phase signal. Further, there is a time difference between the timing at which the voltage value of the phase signal becomes the maximum peak value and the timing at which the voltage value becomes the minimum peak value.

  For this reason, the magnitude of the voltage value of the difference between the maximum side envelope detection signal and the minimum side envelope detection signal indicated by the difference signal generated by the difference signal generation unit is the actual maximum peak value of the phase signal. And a difference between the minimum peak value and the magnitude of the difference. Further, the amount of deviation increases as the rotational speed of the input unit increases (and as the vibration frequency of the phase signal increases).

  However, according to the first aspect, the difference correction signal generation unit generates the difference correction signal obtained by correcting the magnitude of the voltage value of the difference signal. In this case, the magnitude of the voltage value of the differential signal is corrected so that the degree of correction of the magnitude of the voltage value of the differential signal is changed at least according to the rotational speed of the input unit.

  Therefore, regardless of the rotational speed of the input unit, the voltage value of the difference correction signal is a voltage value that accurately indicates the magnitude of the difference between the actual maximum peak value and the minimum peak value of the phase signal. The difference correction signal can be generated. As a result, regardless of the rotational speed of the input unit, it is possible to generate a difference correction signal having a voltage value corresponding to the actual phase change width during the swinging motion (reciprocating swinging) of the swinging link. Become.

  The phase change width estimation processing unit estimates the change width of the phase during the swing motion of the swing link from the voltage value of the difference correction signal.

  Therefore, according to the first aspect of the present invention, it is possible to accurately estimate the phase change width during the swinging motion of the swinging link accompanying the rotation of the turning radius adjusting mechanism.

  In the first aspect of the invention described above, for example, the following form is preferable as a form of the method of correcting the difference signal by the difference correction signal generation unit. That is, the difference correction signal generation unit is configured such that the ratio of the voltage value of the difference correction signal to the voltage value of the difference signal increases as the rotational speed of the input unit decreases. It is comprised so that the magnitude | size of the voltage value of a difference signal may be correct | amended (2nd invention).

  According to the second aspect of the invention, the magnitude of the voltage value of the difference signal is corrected in accordance with the rotational speed of the input unit, so that the estimation accuracy of the change width of the swing link phase can be suitably improved. It can be carried out.

  In the first invention or the second invention, the maximum side envelope detection unit and the minimum side envelope detection unit are configured such that each detection time constant increases as the rotation speed of the input unit decreases. It is preferable that the detection time constant is changed in accordance with the rotational speed of the input unit (third invention).

  The detection time constant of the maximum side envelope detection unit is a time constant (attenuation) indicating the speed at which the magnitude of the voltage value of the maximum side envelope detection signal attenuates after the phase signal reaches the maximum peak value. Time constant). Similarly, the detection time constant of the minimum envelope detector is a time constant (attenuation) indicating the speed at which the magnitude of the voltage value of the minimum envelope detection signal attenuates after the phase signal reaches the minimum peak value. Time constant).

  According to the third aspect of the present invention, even if the rotational speed of the input unit changes in a wide range, the attenuation of the voltage value of each of the maximum side envelope detection signal and the minimum side envelope detection signal is reduced to the phase. It can be performed with a suitable time constant with no excess or deficiency with respect to the vibration frequency of the signal.

  Eventually, by correcting the magnitude of the voltage value of the difference signal, a highly reliable difference correction signal is generated in estimating the phase change width during the swinging movement (reciprocating swinging) of the swinging link. Can do.

  In the third aspect of the invention, the maximum-side envelope detection unit and the minimum-side envelope detection unit each have a detection time constant that increases as the rotational speed of the input unit decreases, and further, the rotation radius adjustment At the time of detection according to the rotational speed of the input unit and the temporal change rate of the rotational radius, the smaller the magnitude of the temporal change rate of the rotational radius estimated from the operating state of the mechanism, the smaller the magnitude. The difference correction signal generation unit is configured to change the constant of the voltage value of the difference signal, in addition to the rotation speed of the input unit, and further to the time of the rotation radius. The magnitude of the voltage value of the differential signal is corrected so as to change in accordance with either the rate of change and the detection time constant of the maximum side envelope detector or the minimum side envelope detector. It is configured as Preferably (fourth invention).

  The change width of the phase of the swing link, and hence the magnitude of the difference between the maximum peak value and the minimum peak value of the phase signal, becomes smaller as the turning radius of the turning radius adjusting mechanism becomes smaller. For this reason, even if the rotation speed of the input unit is maintained constant, the detection time constants of the maximum-side envelope detection unit and the minimum-side envelope detection unit are large in a situation where the rotation radius rapidly decreases. After that, when the magnitude of the voltage value of the maximum side envelope detection signal is attenuated, the voltage value is maintained at a voltage value larger than the maximum peak value of the phase signal after the reduction of the rotation radius, or the minimum side envelope is detected. When the magnitude of the voltage value of the line detection signal is attenuated, the voltage value may be maintained at a voltage value smaller than the minimum peak value of the phase signal after the rotation radius is decreased.

  Therefore, in the fourth aspect of the invention, the maximum-side envelope detector and the minimum-side envelope detector change the detection time constant so that the detection time constant increases as the rotational speed of the input unit decreases. In addition, the detection time constant is changed so as to be smaller as the magnitude of the temporal change rate of the turning radius estimated from the operating state of the turning radius adjusting mechanism is larger.

  As a result, even in a situation where the turning radius rapidly decreases, the maximum side envelope detection signal as a signal indicating the envelope of the maximum peak value and the minimum side envelope as a signal indicating the envelope of the minimum peak value A detection signal can be appropriately generated.

  In this case, the rotation speed of the input unit is constant, and the detection time constant of the maximum side envelope detection unit and the detection time constant of the minimum side envelope detection unit change according to the temporal change rate of the rotation radius. Will be. However, in the fourth aspect of the invention, the difference correction signal generation unit adds the correction degree of the voltage value of the difference signal to the rotation speed of the input unit, and further, the temporal change rate of the rotation radius, The magnitude of the voltage value of the differential signal is corrected so as to be changed according to either the maximum envelope detector or the detection time constant of the minimum envelope detector.

  As a result, the voltage corresponding to the actual phase change width during the swinging movement (reciprocating swinging) of the swinging link, regardless of the rotational speed of the input unit or the temporal change rate of the rotational radius. A difference correction signal having a value can be generated.

  As a result, it is possible to increase the estimation accuracy of the change width of the phase of the swing link regardless of the rotational speed of the input unit or the temporal change rate of the rotation radius.

  In the fourth aspect of the invention, the degree of correction of the difference signal according to any one of the temporal change rate of the rotation radius and the detection time constant of the maximum side envelope detection unit or the minimum side envelope detection unit. For example, the following form is suitable as the form for changing the value.

  That is, the difference correction signal generation unit increases the ratio of the voltage value of the difference correction signal with respect to the voltage value of the difference signal as the rotational speed of the input unit decreases. The difference is set so that the ratio increases as the time change rate of the radius of rotation increases, or as the detection time constant of the maximum envelope detector or the minimum envelope detector decreases. It is comprised so that the magnitude | size of the voltage value of a signal may be correct | amended (5th invention).

  According to the fifth aspect of the invention, the magnitude of the voltage value of the differential signal is corrected according to the rotation speed of the input unit, the temporal change rate of the rotation radius, the maximum envelope detector, or the minimum side Correcting the magnitude of the voltage value of the differential signal in accordance with one of the detection time constants of the envelope detection unit so that the estimation accuracy of the change width of the phase of the swing link can be suitably improved. Can be done appropriately.

  In the first to fifth aspects of the invention, the differential signal generation unit outputs a voltage signal of a difference between the detection signal generated by the maximum side envelope detection unit and the detection signal generated by the minimum side envelope detection unit. The output of the filter obtained by inputting into a low-pass characteristic filter is generated as the differential signal, and the low-pass characteristic filter has a higher cut-off frequency as the rotation speed of the input unit increases. It is preferable that the cutoff frequency is changed in accordance with the rotational speed of the input unit so as to increase (sixth invention).

  According to the sixth aspect of the invention, since the output of the low-pass characteristic filter having the cut-off frequency corresponding to the rotational speed of the input unit is generated as the differential signal, the differential signal is generated as the rotational speed of the input unit. Regardless of this (as a result, regardless of the vibration frequency of the phase signal), it is possible to appropriately generate a smooth differential signal having a high correlation with the difference between the maximum peak value and the minimum peak value of the phase signal.

  As a result, the estimation system of the change width of the phase of the swing link can be further enhanced based on the voltage value of the difference correction signal obtained by correcting the magnitude of the voltage value of the difference signal.

  In the first to sixth inventions, the phase signal can be generated by various methods. For example, as described below, a distance detection sensor may be employed as the sensor.

  That is, the continuously variable transmission can slide on a plurality of mounting pins provided on the outer peripheral surface of the annular portion of the swing link so as to extend radially outward of the annular portion, and the plurality of mounting pins. And a sensor of the phase detector is fixed to the transmission case so as to face the outer surface of the member to be detected, and at a distance to the member to be detected. A distance detecting sensor that generates a corresponding output, and the outer surface shape of the detected member is such that the distance from the outer surface of the detected member to the distance detecting sensor changes according to the phase of the swing link. It is made into a shape (seventh invention).

  According to this seventh invention, the detected member is slidably attached to the plurality of attachment pins extending radially outward of the annular portion. For this reason, even if a change in the diameter of the annular portion of the swing link occurs due to a load received by the swing link from a connecting rod or a one-way rotation prevention mechanism, the detected member is a mounting pin attached to the annular portion. It is possible to prevent changes in the shape and position of the detected member by sliding relative to each other.

  Therefore, the distance from the outer surface of the detected member to the distance detection sensor, and hence the distance indicated by the output of the distance detection sensor (the distance from the outer surface of the detected member to the distance detection sensor) is the phase of the swing link. It has a high correlation with. As a result, the phase signal can be appropriately generated from the output of the distance detection sensor.

Sectional drawing which shows the continuously variable transmission of one Embodiment of this invention. The schematic diagram which shows the turning-radius adjustment mechanism, connecting rod, and rocking | fluctuation link of the continuously variable transmission of embodiment from an axial direction. (A)-(c) is a schematic diagram which shows the change of the rotation radius of the rotation radius adjustment mechanism of the continuously variable transmission of embodiment. (A)-(c) is a schematic diagram which shows the relationship between the change of the rotation radius of the rotation radius adjustment mechanism of the continuously variable transmission of embodiment, and the rocking | fluctuation angle of the rocking | fluctuation motion of a rocking | fluctuation link. The schematic diagram which shows schematic structure of the operation state estimation apparatus of the continuously variable transmission of embodiment. The graph which excites the relationship between the rotational speed of the input part of the continuously variable transmission of embodiment, and the phase of a rocking | fluctuation link. The figure which shows the whole circuit structure of the operation state estimation apparatus of embodiment. (A) is a figure which shows the circuit structure of the maximum side envelope detection part shown in FIG. 7, (b) is a figure which shows the circuit structure of the minimum side envelope detection part shown in FIG. The graph which shows the example of the time-dependent change of the phase signal in embodiment, the maximum side envelope detection signal, and the minimum side detection signal. The graph which shows the relationship between the rotational speed of the input part of the continuously variable transmission in embodiment, and a detection time constant. The graph which shows the example of the time-dependent change of difference signal A, B and a difference correction signal in embodiment. The graph which shows the relationship between the rotational speed of the input part of the continuously variable transmission in embodiment, and the cutoff frequency of the filter of a difference signal generation part. The graph which shows the relationship between the rotational speed of the input part of the continuously variable transmission in embodiment, the rotational radius of a rotational radius adjustment mechanism, and the gain of a difference correction signal generation part. The graph which shows the example of the time-dependent change of the phase signal in the embodiment, the maximum side envelope detection signal, the minimum side detection signal, the difference signal A, and the difference correction signal.

  Hereinafter, an embodiment of the present invention will be described. The continuously variable transmission of this embodiment is a four-bar linkage mechanism type continuously variable transmission. This continuously variable transmission has a transmission ratio i (i = rotational speed of the input unit / rotational speed of the output shaft) that is infinite (∞), and the rotational speed of the output shaft can be set to “0”. Infinity Variable Transmission).

  First, with reference to FIG.1 and FIG.2, the structure of the continuously variable transmission 1 of this embodiment is demonstrated.

  The continuously variable transmission 1 of the present embodiment includes an input unit 2 that rotates about a rotation center axis P1 by receiving a rotation driving force from a driving source for driving such as an internal combustion engine or an electric motor, and a rotation center axis. An output shaft 3 disposed in parallel with P1 and six rotation radius adjusting mechanisms 4 provided on the rotation center axis P1 are provided.

  The output shaft 3 transmits rotational power to drive wheels (not shown) of the vehicle via a differential gear or a propeller shaft.

  Each turning radius adjusting mechanism 4 is provided to rotate about the rotation center axis P1. Each turning radius adjusting mechanism 4 includes a cam disk 5 as a cam part, a rotating disk 6 as a rotating part, and a pinion shaft 7 having a plurality of pinions.

  The cam disk 5 is formed in a disk shape. The cam disks 5 are eccentric from the rotation center axis P <b> 1, and are provided in each rotation radius adjustment mechanism 4 so as to form one set with respect to one rotation radius adjustment mechanism 4. The cam disk 5 is provided with a through hole 5a penetrating in the direction of the rotation center axis P1.

  Further, the cam disk 5 is provided with a notch hole 5b for communicating the outer peripheral surface of the cam disk 5 with the inner peripheral surface constituting the through hole 5a. The cutout hole 5b opens in a direction opposite to the direction eccentric with respect to the rotation center axis P1.

  In addition, each set of cam disks 5 is arranged so as to make a round in the circumferential direction of the rotation center axis P1 with six sets of cam disks 5 with a phase difference of 60 degrees.

  Further, the cam disk 5 is connected to the cam disk 5 of the adjacent turning radius adjusting mechanism 4 to constitute an integral cam portion. This integrated cam portion may be formed by integral molding, or may be integrated by welding two cam disks.

  Further, adjacent cam disks 5 are fixed with bolts (not shown). The cam disk 5 located closest to the driving source for traveling on the rotation center axis P <b> 1 is connected to the input unit 2 integrally. In this way, the camshaft 50 is configured by the input unit 2 and the cam disk 5.

  The camshaft 50 has an insertion hole 50a configured by connecting the through holes 5a of the cam disk 5. Thereby, the camshaft 50 is configured in a hollow shaft shape in which one end opposite to the driving source for driving is opened and the other end is closed.

  The cam disk 5 located at the other end on the traveling drive source side is formed integrally with the input unit 2. As a method of integrally forming the cam disk 5 and the input unit 2, for example, integral molding can be used. Alternatively, the cam disk 5 and the input unit 2 may be integrated by welding.

  The rotating disk 6 is formed in a disk shape in which a receiving hole 6a is provided at a position eccentric from the center thereof. The rotating disk 6 is rotatably fitted to the set of cam disks 5 one by one through the receiving hole 6a. The receiving hole 6 a of the rotating disk 6 is provided with an internal tooth 6 b at a position between the pair of cam disks 5.

  Further, the receiving hole 6a of the rotating disk 6 has a distance Ra from the rotation center axis P1 of the input unit 2 to the center P2 of the cam disk 5 (center of the receiving hole 6a) and the center P2 of the cam disk 5 to the center of the rotating disk 6. The cam disk 5 is eccentric so that the distance Rb to P3 is the same.

  In the insertion hole 50a of the camshaft 50, the pinion shaft 7 is disposed concentrically with the rotation center axis P1 so as to be rotatable relative to the camshaft 50.

  The pinion shaft 7 has external teeth 7 a at locations corresponding to the internal teeth 6 b of the rotary disk 6. The external teeth 7 a mesh with the internal teeth 6 b of the rotating disk 6 through the cutout holes 5 b of the cam disk 5. The external teeth 7a may be configured separately from the pinion shaft 7, and the external teeth 7a may be connected to the pinion shaft 7 by spline coupling.

  The pinion shaft 7 is provided with a bearing 7b positioned between the adjacent external teeth 7a. The pinion shaft 7 supports the camshaft 50 through the bearing 7b.

  The continuously variable transmission 1 further includes a differential mechanism 8 for adjusting the relative speed between the input unit 2 and the pinion shaft 7.

  The differential mechanism 8 is configured as a planetary gear mechanism. Specifically, the differential mechanism 8 meshes with the sun gear 9, the first ring gear 10 connected to the input unit 2, the second ring gear 11 connected to the pinion shaft 7, the sun gear 9 and the first ring gear 10. And a carrier 13 that pivotally supports the stepped pinion 12 including a small-diameter portion 12b that meshes with the second ring gear 11 so as to rotate and revolve. The sun gear 9 of the differential mechanism 8 is connected to a rotating shaft 14 a of an adjusting drive source 14 that is a rotary actuator for driving the pinion shaft 7. The adjustment drive source 14 is constituted by, for example, an electric motor.

  Since the differential mechanism 8 is configured as described above, when the rotational speed of the rotary shaft 14a of the adjustment drive source 14 is the same as the rotational speed of the input unit 2, the sun gear 9 and the first ring gear 10 are It will rotate at the same speed. As a result, the four elements of the sun gear 9, the first ring gear 10, the second ring gear 11, and the carrier 13 are in a locked state in which relative rotation is impossible. As a result, the pinion shaft 7 connected to the second ring gear 11 rotates at the same speed as the input unit 2.

  When the rotational speed of the rotating shaft 14a of the adjusting drive source 14 is made slower than the rotational speed of the input unit 2, the rotational speed of the sun gear 9 is Ns, the rotational speed of the first ring gear 10 is NR1, and the sun gear 9 and the first ring gear. When the gear ratio of 10 (the number of teeth of the first ring gear 10 / the number of teeth of the sun gear 9) is expressed as j, the rotational speed of the carrier 13 is (j · NR1 + Ns) / (j + 1).

  Further, the gear ratio between the sun gear 9 and the second ring gear 11 ((number of teeth of the second ring gear 11 / number of teeth of the sun gear 9) × (number of teeth of the large diameter portion 12a of the stepped pinion 12 / number of teeth of the small diameter portion 12b). ) Is expressed as k, the rotation speed of the second ring gear 11 is {j (k + 1) NR1 + (k−j) Ns} / {k (j + 1)}.

  When there is a difference between the rotational speed of the input unit 2 and the rotational speed of the pinion shaft 7, the rotating disk 6 rotates the periphery of the cam disk 5 around the center P <b> 2 of the cam disk 5.

  As shown in FIG. 2, the rotating disk 6 has a distance Ra from the rotation center axis P1 of the input section 2 to the center P2 of the cam disk, and the center P3 of the rotating disk from the center P2 of the cam disk. To the same distance Rb.

  Therefore, the center P3 of the rotating disk 6 can be positioned on the same line as the rotation center axis P1 of the input unit 2. In other words, the distance (rotational radius of the rotational radius adjusting mechanism 4) between the rotational center axis P1 of the input unit 2 and the center P3 of the rotational disk 6, that is, the eccentric amount R1 can be set to “0”.

  A connecting rod 15 is rotatably fitted around the periphery of the rotating disk 6 of the turning radius adjusting mechanism 4.

  The connecting rod 15 has a large-diameter large-diameter annular portion 15a at one end, and a small-diameter annular portion 15b having a smaller diameter than the diameter of the large-diameter annular portion 15a at the other end. The large-diameter annular portion 15a of the connecting rod 15 is externally fitted to the rotary disk 6 via a connecting rod bearing 16 formed of a ball bearing.

  A swing link 18 is pivotally supported on the output shaft 3 via a one-way clutch 17 as a one-way rotation prevention mechanism.

  The one-way clutch 17 fixes the swing link 18 with respect to the output shaft 3 and rotates the other side with respect to the output shaft 3 when trying to rotate relative to the output shaft 3 around the rotation center axis P4 of the output shaft 3. When the relative rotation is to be performed, the swing link 18 is idled with respect to the output shaft 3.

  The swing link 18 is provided with a swing end 18a. The swing end portion 18a is provided with a pair of projecting pieces 18b formed so that the small-diameter annular portion 15b can be sandwiched in the axial direction. The pair of projecting pieces 18b are formed with through holes 18c corresponding to the inner diameter of the small-diameter annular portion 15b. The connecting rod 15 and the swing link 18 are connected by inserting the connecting pin 19 into the through hole 18c and the small-diameter annular portion 15b.

  In the present embodiment, the input portion 2 and the cam disk 5 constitute a camshaft 50, and the camshaft 50 includes an insertion hole 50a configured by connecting the through holes 5a of the cam disk 5. explained.

  However, the camshaft in the continuously variable transmission according to the present invention is not limited to such a configuration. For example, the input part is configured in a hollow shaft shape having an insertion hole so that one end is opened. Further, the through hole is formed larger than that of the present embodiment so that the input portion can be inserted into the disc-shaped cam disk. Then, the cam disk may be splined to the outer peripheral surface of the input portion configured in a hollow shaft shape.

  In this case, the input portion formed of the hollow shaft is provided with a notch hole corresponding to the notch hole of the cam disk. Then, the pinion inserted into the input part meshes with the internal teeth of the rotating disk via the notch hole of the input part and the notch hole of the cam disk.

  In the present embodiment, the one-way clutch 17 is used as the one-way rotation prevention mechanism. However, the one-way rotation prevention mechanism used in the continuously variable transmission of the present invention is not limited to such a one-way clutch 17.

  For example, you may comprise with the two-way clutch (two-way clutch) comprised so that switching of the rotation direction with respect to the output shaft of the rocking | fluctuation link which can transmit a torque from a rocking | fluctuation link to an output shaft is possible.

  Next, the lever crank mechanism of the continuously variable transmission according to this embodiment will be described with reference to FIGS.

  As shown in FIG. 2, in the continuously variable transmission 1 of the present embodiment, a lever radius adjusting mechanism 4, a connecting rod 15, and a swing link 18 constitute a lever crank mechanism 20 (four-bar linkage mechanism). ing.

  The lever crank mechanism 20 converts the rotational motion of the input unit 2 into the swing motion of the swing link 18. As shown in FIG. 1, the continuously variable transmission 1 of this embodiment includes a total of six lever crank mechanisms 20.

  In the lever crank mechanism 20, when the rotation radius of the rotation radius adjustment mechanism 4, that is, the eccentric amount R 1 is not “0”, when the input unit 2 and the pinion shaft 7 are rotated at the same speed, each connecting rod 15 is The rocking link 18 is alternately pushed between the input unit 2 and the output shaft 3 toward the output shaft 3 and pulled toward the input unit 2 while changing the phase by 60 degrees. Thereby, the swing link 18 is swung.

  A one-way clutch 17 is provided between the swing link 18 and the output shaft 3. The one-way clutch 17 is configured such that the swing link 18 is fixed to the output shaft 3 when the swing link 18 is pushed or pulled by the connecting rod 15. It is configured. In this case, the force of the swing motion of the swing link 18 is transmitted to the output shaft 3 and the output shaft 3 rotates.

  In addition, the one-way clutch 17 is configured such that the swing link 18 is idle with respect to the output shaft 3 when the swing link 18 is pushed or pulled. . In this case, the force of the swing motion of the swing link 18 is not transmitted to the output shaft 3, and the output shaft 3 does not rotate.

  Since the six turning radius adjusting mechanisms 4 are arranged by changing the phase by 60 degrees, the output shaft 3 is sequentially rotated by the six turning radius adjusting mechanisms 4.

  Moreover, in the continuously variable transmission 1 of this embodiment, as shown in FIG. 3, the rotation radius of the rotation radius adjustment mechanism 4, that is, the eccentric amount R1 is adjustable.

  FIG. 3A shows a state in which the eccentric amount R1 is “maximum”, and the rotation center axis P1 of the input unit 2, the center P2 of the cam disk 5, and the center P3 of the rotation disk 6 are aligned. The pinion shaft 7 and the rotating disk 6 are located. In this case, the gear ratio i is minimized. FIG. 3B shows a state in which the eccentric amount R1 is set to “medium” which is smaller than that in FIG. 3A, and FIG. 3C illustrates that the eccentric amount R1 is smaller than that in FIG. Is shown. The gear ratio i is “medium” which is larger than the gear ratio i in FIG. 3A in FIG. 3B, and “large” which is larger than the gear ratio i in FIG. 3B in FIG. Become. FIG. 3D shows a state where the eccentricity R1 is set to “0”, and the rotation center axis P1 of the input unit 2 and the center P3 of the rotary disk 6 are located concentrically. In this case, the gear ratio i is infinite (∞).

  FIG. 4 is a schematic diagram showing the relationship between the rotation radius of the rotation radius adjusting mechanism 4 of the present embodiment, that is, the change in the eccentricity R1 and the swing angle of the swing motion of the swing link 18.

  4A shows the case where the eccentric amount R1 is “maximum” in FIG. 3A (when the gear ratio i is the minimum), and FIG. 4B shows the case where the eccentric amount R1 is “ 4 (c) shows the case where the eccentric amount R1 is “small” in FIG. 3 (c) (when the gear ratio i is large). The swing range θ2 of the swing link 18 with respect to the rotational movement of the turning radius adjusting mechanism 4 is shown. In other words, the swing range θ2 of the swing link 18 is the phase of the swing link 18 (specifically, the swing angle around the swing center of the swing link 18 (rotation center axis P4 of the output shaft 3)). Is the range of change. The change width is a phase difference between one end side dead center and the other end side dead center of the swing motion of the swing link 18.

  Here, the distance from the rotation center axis P4 of the output shaft 3 to the connecting point of the connecting rod 15 and the swinging end portion 18a, that is, the center P5 of the connecting pin 19, is the length R2 of the swinging link 18.

  As is apparent from FIG. 4, as the eccentric amount R1 becomes smaller, the swing range θ2 of the swing link 18 becomes narrower, and when the eccentric amount R1 becomes “0”, the swing link 18 swings. It stops moving (θ2 = 0).

  Next, with reference to FIG. 1, the transmission case 60 of the continuously variable transmission 1 of the present embodiment will be described.

  As shown in FIG. 1, the transmission case 60 includes one end wall 60a, the other end wall 60b disposed to face the one end wall 60a, the six lever crank mechanisms 20, and the one-way clutch 17. Covering with a space, the outer wall of one end wall 60a is connected to the outer edge of the other wall 60b and a peripheral wall 60c is formed.

  And the pinion shaft 7 protrudes from the one end wall part 60a. The pinion shaft 7 is connected to a differential mechanism 8 housed in a differential mechanism case 8a attached to one end wall 60a. On the other hand, the input part 2 protrudes from the other end wall part 60b. The input unit 2 is connected to a crankshaft serving as an output shaft of an engine (a driving source for travel) (not shown) attached to the other end wall 60b via a torsional damper.

  Next, with reference to FIGS. 5-14, the operation state estimation apparatus 71 of the continuously variable transmission 1 of this embodiment is demonstrated in detail.

  Referring to FIG. 5, the motion state estimation device 71 includes a swing range θ2 of the swing link 18 during the swing motion of the swing link 18 accompanying the rotation of the turning radius adjusting mechanism 4, that is, the swing link. 18, a change width θ2 of the phase θ (hereinafter referred to as a phase change width θ2) is estimated. The phase θ of the swing link 18 is a swing angle of the swing link 18 with reference to an arbitrary angular position around the swing center of the swing link 18 (rotation center axis P4 of the output shaft 3). .

  The phase θ of the swing link 18 vibrates with the rotation of the input unit 2 as shown in FIG. 6 when the eccentricity R1 of the turning radius adjusting mechanism 4 (hereinafter referred to as the turning radius R1) is maintained at a non-zero value. To do. In this case, basically, the larger the rotation radius R1, the larger the phase change width θ2 of the swing link 18. Note that the phase change width θ2 in FIG. 6 indicates the phase change width θ2 when the rotation radius R1 is the maximum.

  When the rotation radius R1 is zero, the phase θ of the swing link 18 is maintained at a constant value θ0. Then, the phase θ of the swing link 18 when the rotation radius R1 is not zero oscillates above and below the phase θ0 of the swing link 18 when the rotation radius R1 is zero.

  The operating state estimation device 71 outputs a detection signal (voltage signal) corresponding to the phase θ of the swing link 18 in order to estimate the phase change width θ2 of the swing link 18, And a circuit unit 73 for inputting a detection signal.

  In the present embodiment, the sensor 72 is a distance detection sensor (ranging sensor). Hereinafter, the sensor 72 is referred to as a distance detection sensor 72. The distance detection sensor 72 is a sensor that outputs a signal having a voltage value corresponding to the distance between the object 72 and the object that is disposed to face the sensor 72. As the distance detection sensor 72, various types of distance measuring sensors such as an ultrasonic echo sensor or a laser distance measuring sensor can be employed.

  In order to generate a detection signal according to the phase θ of the swing link 18 by the distance detection sensor 72, the continuously variable transmission 1 of the present embodiment is provided on the outer peripheral surface of the annular portion 18d of the swing link 18. Two attachment pins 21 and a detected member 22 attached to the annular portion 18d via the attachment pins 21 are provided. The distance detection sensor 72 is fixed to the transmission case 60 so as to face the outer surface of the detected member 22.

  The detected member 22 extends in the circumferential direction of the annular portion 18 d of the swing link 18. The shape of the outer surface of the detected member 22 (the surface facing the distance detection sensor 72) is the distance from the outer surface to the distance detection sensor 72 with respect to the change (increase or decrease) of the phase θ of the swing link 18. X is formed so as to change monotonously (monotonically increasing or monotonically decreasing).

  In the present embodiment, the distance X from the outer surface of the detected member 22 to the distance detection sensor 72 changes linearly and monotonously with respect to the change in the phase θ of the swing link 18 (in other words, the phase θ The outer surface shape of the detected member 22 is formed so that the amount of change of the distance X per unit amount of change is maintained constant.

  However, the shape of the outer surface of the detected member 22 is formed so that the distance X from the outer surface of the detected member 22 to the distance detection sensor 72 changes nonlinearly and monotonously with respect to the change in the phase θ of the swing link 18. Also good.

  Since the member 22 to be detected and the distance detection sensor 72 are arranged in this way, the detection signal output from the distance detection sensor 72 has a voltage value (instantaneous value) corresponding to a change in the phase θ of the swing link 18. On the other hand, the voltage signal changes monotonously.

  For this reason, when the swing link 18 repeats reciprocal swing as the turning radius adjusting mechanism 4 rotates, the detection signal of the distance detection sensor 72 has a vibration waveform that vibrates in synchronization with the reciprocal swing of the swing link 18. Signal.

  Supplementally, in the continuously variable transmission 1 of the present embodiment, the rolling element included in the one-way clutch 17 is sandwiched between the swing link 18 and the output shaft 3, thereby forming the shape of the annular portion 18 d of the swing link 18. However, it may change to a state of increasing in the radial direction.

  However, in the continuously variable transmission 1 of the present embodiment, the detected member 22 includes two members that extend radially outward from the center of the annular portion 18d, that is, the rotation center axis P4 of the output shaft 3. The mounting pin 21 is slidably attached.

  Therefore, in the continuously variable transmission 1 of the present embodiment, the position of the detected member 22 is determined by the mounting pin 21 sliding relative to the detected member 22 even if the shape of the annular portion 18d changes in the radial direction. And no change in shape.

  As a result, even if the shape of the annular portion 18d changes in the radial direction, the distance X from the outer surface of the detected member 22 to the distance detection sensor 72, and hence the voltage value of the detection signal of the distance detection sensor 72, fluctuates. The correlation with respect to the phase θ of the link 18 is high. Therefore, if the phase θ of the swing link 18 is constant, even if the shape of the annular portion 18d changes in the radial direction, the distance from the outer surface of the detected member 22 to the distance detection sensor 72, and thus the distance detection sensor. The voltage value of the detection signal 72 is maintained almost constant.

  The circuit unit 73 that inputs the detection signal of the distance detection sensor 72 is a unit that estimates the phase change width θ2 of the swing link 18 based on the detection signal. The circuit unit 73 is configured as shown in FIG.

  That is, the circuit unit 73 includes a phase detection unit 81 that generates a phase signal for estimating the phase change width θ2 of the swing link 18 from the output (detection signal) of the distance detection sensor 72, and the maximum peak value side of the phase signal. Maximum-side envelope detectors that respectively generate a detection signal indicating an envelope (hereinafter referred to as a maximum-side envelope detection signal) and a detection signal indicating a minimum-peak-value-side envelope (hereinafter referred to as a minimum-side envelope detection signal). 82a and the minimum envelope detector 82b, a difference signal generator 83 that generates a difference signal indicating a difference voltage value between the maximum envelope detection signal and the minimum envelope detection signal, and the voltage value of the difference signal A difference correction signal generation unit 84 that generates a difference correction signal obtained by correcting the magnitude, and a phase change width estimation processing unit 85 that estimates the phase change width θ2 from the voltage value of the difference correction signal are provided.

  Hereinafter, the operation of the operation state estimation device 71 will be described in detail including the detailed description of the circuit unit 73.

  In the present embodiment, the operation state estimation device 71 is activated and its operation is started by turning on a driving switch (for example, an ignition switch) of a vehicle (not shown) on which the continuously variable transmission 1 is mounted.

  A turning radius R1 of the turning radius adjusting mechanism 4 is controlled by a control device (not shown) that controls the driving of the vehicle in a state where the input unit 2 of the continuously variable transmission 1 is driven to rotate by a driving source for the vehicle, for example, an engine. Is appropriately adjusted via the adjusting drive source 14.

  At this time, in a state where the rotation radius R1 is adjusted to a non-zero value, the swing link 18 reciprocally swings as shown in FIG. 4 as the input unit 2 rotates.

  The reciprocating swing of the swing link 18 causes the phase θ of the swing link 18 to vibrate, so that a vibration waveform detection signal is output from the distance detection sensor 72. In this case, as described with reference to FIG. 6, the phase change width θ2 of the swing link 18 increases as the rotation radius R1 increases, and therefore the maximum peak of the detection signal (vibration waveform signal) of the distance detection sensor 72. The amplitude of the difference between the value and the minimum peak value (so-called peak-to-peak amplitude) also increases as the rotation radius R1 increases.

  Further, since the phase θ of the swing link 18 when the rotation radius R1 is zero is maintained at a constant value θ0, the distance X from the outer surface of the detected member 22 to the distance detection sensor 72 is maintained constant. For this reason, the detection signal of the distance detection sensor 72 is maintained at a constant voltage value corresponding to the certain distance.

  When the rotation radius R1 is not zero, the voltage value of the detection signal of the distance detection sensor 72 oscillates above and below a certain voltage value corresponding to the rotation radius R1 being zero.

  The detection signal of the distance detection sensor 72 is input to the phase detection unit 81 of the circuit unit 73.

  As shown in FIG. 7, the phase detector 81 includes a low-pass filter 81a (low-pass characteristic filter) and a subtracting circuit 81b. The detection signal of the distance detection sensor 72 is input to the low pass filter 81a. Thus, a smooth waveform signal obtained by removing high frequency noise components from the detection signal of the distance detection sensor 72 is output from the low pass filter 81a.

  Here, the vibration frequency of the phase θ when the reciprocating rocking of the rocking link 18 (and hence the vibration frequency of the detection signal of the distance detection sensor 72) is rotationally driven by a travel drive source (engine in the present embodiment). The frequency corresponds to the rotation speed of the input unit 2. For example, when the rotational speed of the input unit 2 is 6000 rpm, the vibration frequency of the phase θ of the swing link 18 is 6000/60 = 100 Hz. Therefore, the vibration frequency of the detection signal of the distance detection sensor 72 changes depending on the rotational speed of the input unit 2.

  Therefore, the cutoff frequency of the low-pass filter 81a is set in advance to a predetermined frequency higher than the frequency corresponding to the maximum rotation speed of the input unit 2.

  In the present embodiment, the input unit 2 is rotationally driven at a constant speed with the output shaft (crankshaft) of the engine that is a driving source for traveling. In this case, the maximum rotation speed of the input unit 2 matches the maximum rotation speed of the engine that is the driving source for traveling.

  The output signal of the low-pass filter 81a is input to the subtraction circuit 81b. In addition to the output signal of the low-pass filter 81a, a predetermined direct-current voltage Vs0 is also input to the subtraction circuit 81b. Then, the subtracting circuit 81b generates a voltage signal obtained by subtracting the DC voltage Vs0 from the output signal of the low-pass filter 81a (in other words, a signal obtained by offsetting the output signal of the low-pass filter 81a by the value of Vs0) as a phase signal. .

  The DC voltage Vs0 is a voltage value of a detection signal of the distance detection sensor 72 corresponding to the phase θ0 of the swing link 18 when the rotation radius R1 of the rotation radius adjusting mechanism 4 is zero. The voltage value is a value determined in advance by actual measurement or the like.

  The phase detector 81 generates the phase signal as described above. The phase signal generated in this way removes high-frequency component noise from the detection signal of the distance detection sensor 72 and detects the voltage value of the detection signal by the distance detection sensor 72 when the rotation radius R1 is zero. This is offset by a DC voltage Vs0 having a predetermined value corresponding to the voltage value of the signal.

  Therefore, when the rotation radius R1 is not zero, the phase signal has a monotonic change (monotonic increase or decrease) with respect to a change (increase or decrease) in the phase θ of the swing link 18, as illustrated in FIG. Monotonously decreasing) and an alternating current signal having a vibration waveform that vibrates positively and negatively with the vibration of the phase θ. The vibration waveform of the phase signal is not a sine wave AC waveform but a pseudo sine wave AC waveform close to a sine wave AC waveform.

  Then, the maximum peak value (positive maximum value) and the minimum peak value (negative minimum value) of the phase signal are respectively the phase value on one end side and the other end side in the vibration of the phase θ of the swing link 18. Corresponds to the phase value of. For this reason, the difference between the maximum peak value and the minimum peak value of the phase signal has a one-to-one correspondence with the phase change width θ 2 of the swing link 18.

  Therefore, if the difference between the maximum peak value and the minimum peak value of the phase signal is specified, the phase change width θ2 can be specified from the difference value.

  The phase signal generated by the phase detection unit 81 as described above is input to the maximum side envelope detection unit 82a and the minimum side envelope detection unit 82b.

  The maximum-side envelope detector 82a and the minimum-side envelope detector 82b are configured as shown in FIGS. 8A and 8B, for example.

  The maximum side envelope detection unit 82a and the minimum side envelope detection unit 82b are different only in the directions of the diodes 92a and 92b included in each, and therefore, the following description will focus on the maximum side envelope detection unit 82a. The description of the minimum side envelope detector 82b will be only a brief description.

  The maximum envelope detector 82a is connected between a pair of input terminals 91a1 and 91a2 for inputting the phase signal output from the phase detector 81 and the input terminals 91a1 and 91a2, as shown in FIG. A diode 92a, a resistor element 93a, and a capacitor element 94a.

  When the voltage value of the phase signal is positive, the input terminal 91a1 has a higher potential than the input terminal 91a2, and when the voltage value of the phase signal is negative, the input terminal 91a2 is input to the input terminals 91a1 and 91a2. A phase signal is input so as to have a higher potential than the terminal 91a1.

  Note that the phase detection unit 81 in the drawing is represented by an equivalent circuit including an AC signal source 81y as a phase signal generation source and a resistance element 81x as an output resistance of the phase detection unit 81.

  The resistance element 93a and the capacitive element 94a of the maximum side envelope detector 82a are connected in parallel to the cathode pole side of the diode 92a. One end of the series circuit of the parallel circuit of the resistor element 93a and the capacitor element 94a and the diode 92a on the diode 92a side (the anode pole of the diode 92a) is electrically connected to the input terminal 91a1, and the other end of the series circuit is connected to the diode 92a. It is electrically connected to the input terminal 91a2.

  Further, both ends of the capacitive element 94a are electrically connected to the output terminals 95a1 and 95a2. Therefore, the maximum side envelope detection unit 82a is configured to generate the voltage of the capacitive element 94a as a maximum side envelope detection signal.

  The capacitive element 94a in the illustrated example is a capacitor, but may be a capacitive element other than a capacitor. In the present embodiment, the resistance element 93a is a variable resistance, which will be described later.

  In the maximum side envelope detector 82a configured as described above, the capacitance value C of the capacitive element 94a and the resistance value Rd of the resistive element 93a are set so as to satisfy the condition of the following expression (1).

Rs · C << 1 / fc << Rd · C << 1 / W (1)

Here, Rs in Equation (1) is the resistance value of the output resistance of the phase detector 81 (resistance value of the resistance element 81x in the figure), and fc is the oscillation frequency of the phase signal. W is the frequency of change of the rotation radius R1 when the rotation radius R1 of the rotation radius adjustment mechanism 4 is changed (this corresponds to the fluctuation frequency of the maximum peak value or the minimum peak value of the phase signal). is there. The resistance value Rs of the output resistance of the phase detector 81 is a substantially constant value.

  Rs · C means a charging time constant of the capacitive element 94a based on the phase signal, and Rd · C means a discharging time constant when the capacitive element 94a is discharged. In this embodiment, the discharge time constant (= Rd · C) of the capacitive element 94a is the detection time constant of the maximum side envelope detection unit 82a.

  By setting the capacitance value C and the resistance value Rd so as to satisfy the condition of the above formula (1), the maximum side envelope detection unit 82a receives the maximum side envelope detection signal from the capacitive element 94a as illustrated in FIG. Can be output.

  That is, the capacitive element 94a is charged via the diode 92a in a state where the voltage value of the phase signal input to the maximum side envelope detector 82a becomes a positive voltage value and increases toward the maximum peak value. Is done. In this case, by setting the capacitance value C so that the charging time constant (= Rs · C) of the capacitive element 94a is sufficiently smaller than 1 / fc according to the condition (1), the capacitive element 94a is set. The voltage immediately follows the voltage value of the phase signal and rises to the maximum peak value.

  Then, when the voltage value of the phase signal reaches the maximum peak value and then decreases from the maximum peak value, the diode 92a enters a reverse bias state, and thus the capacitive element 94a is discharged through the resistance element 93a.

  In this case, by setting the capacitance value C and the resistance value Rd so that the discharge time constant (= Rs · C) of the capacitive element 94a is sufficiently larger than 1 / fc according to the condition (1), The voltage of the capacitive element 94a attenuates more slowly than the voltage value of the phase signal. Then, when the voltage value of the phase signal becomes a positive voltage value again and increases toward the maximum peak value, and then becomes larger than the voltage of the capacitor element 94a, the capacitor element 94a again has the maximum peak value. The voltage is charged through the diode 92a.

  In this way, charging / discharging of the capacitive element 94a is performed according to the oscillation of the voltage value of the phase signal, so that a maximum envelope detection signal is generated as illustrated in FIG. This maximum-side envelope detection signal is a signal whose voltage value is maintained in the vicinity of the maximum peak value of the phase signal.

  If the discharge time constant (= Rd · C) of the capacitive element 94a is excessively increased, the rotational radius R1 of the rotational radius adjusting mechanism 4 decreases relatively rapidly during the discharge of the capacitive element 94a, and consequently the phase signal. When a situation occurs in which the maximum peak value decreases rapidly, the voltage of the capacitive element 94a during discharge may be maintained at a voltage value higher than the maximum peak value where the phase signal decreases. .

  However, the discharge time constant (= Rd · C) of the capacitive element 94a is set so as to satisfy the condition of Rd · C << 1 / W according to the condition of the formula (1). It is possible to prevent the voltage of the capacitive element 94a from being maintained at a voltage value higher than the maximum peak value in which the phase signal is reduced.

  By the way, the rotational speed of the input unit 2 that is rotationally driven by the travel drive source (engine) changes in a wide range while the vehicle is traveling, so the vibration frequency fc of the phase signal also changes in a wide range.

  Further, when the rotation radius R1 of the rotation radius adjustment mechanism 4 is changed (when the speed change operation of the continuously variable transmission 1 is performed), there are a situation where the change is performed relatively slowly and a situation where the change is performed relatively quickly. . Therefore, the frequency W of change of the rotation radius R1 can also be changed in a wide range.

  For this reason, when the discharge time constant (= Rd · C) as the detection time constant of the maximum side envelope detection unit 82a is set to a constant value, the rotational speed of the input unit 2 or the temporal change rate of the rotation radius R1 It is difficult to always satisfy the condition of the expression (1) regardless of (hereinafter referred to as a change speed).

  Therefore, in the present embodiment, the discharge time constant (= Rd · C, hereinafter referred to as the detection time constant τ) is changed to be maximum according to the rotation speed of the input unit 2 and the change speed of the rotation radius R1. A side envelope detector 82a was configured.

  Specifically, as shown in FIG. 8A, the resistance element 93a of the maximum side envelope detector 82a is configured by a variable resistor that can change the resistance value Rd. The resistance element 93a as a variable resistor may be configured so that the resistance value Rd can be continuously changed, and the resistance value Rd can be selectively switched to a plurality of values. It may be done.

  The maximum envelope detector 82a includes a time constant controller 96a that changes the detection time constant τ (= Rd · C) by performing variable control of the resistance value Rd of the resistance element 93a.

  In the time constant control unit 96a, the detected value (or estimated value) of the actual rotational speed Ni of the input unit 2 and the estimated value of the actual change speed R1_dot of the rotational radius R1 are illustrated in the illustration of the continuously variable transmission 1. Not from the control device.

  Here, in the present embodiment, the input unit 2 is rotationally driven at the same speed as the output shaft (crankshaft) of the engine that is a driving source for traveling. Therefore, the detected value of the rotational speed of the output shaft of the engine by a rotational speed sensor (not shown) attached to the engine is used as the detected value of the actual rotational speed Ni of the input unit 2 given to the maximum side envelope detector 82a. Is done.

  Further, as the estimated value of the change speed R1_dot of the rotation radius R1, a value estimated based on the operation state of the rotation radius adjustment mechanism 4 is used. Specifically, in the present embodiment, the change speed R1_dot of the rotation radius R1 corresponds to the difference between the rotation speed of the rotation shaft 14a of the adjustment drive source 14 and the rotation speed Ni of the input unit 2. .

  Therefore, as an estimated value of the change speed R1_dot of the rotation radius R1 given to the maximum side envelope detection unit 82a, an actual rotation speed Ni detected value of the input unit 2 and an adjustment drive source 14 not shown. An estimated value obtained from a map or an arithmetic expression prepared in advance from the detected value of the rotational speed of the rotary shaft 14a of the adjusting drive source 14 by the rotational speed sensor is used.

  The time constant control unit 96a determines a detection time constant τ based on a map (or an arithmetic expression) created in advance according to the given values of Ni and R1_dot, and uses the determined detection time constant τ as a capacitive element. The resistance value Rd of the resistance element 93a is controlled so that the resistance value Rd of the resistance element 93a matches or substantially matches the resistance value divided by the capacitance value C of 94a. Thereby, the detection time constant τ of the maximum side envelope detector 82a is set so as to change according to the values (instantaneous values) of Ni and R1_dot.

  In this case, the detection time constant τ is determined with a tendency as shown in the graph of FIG. 10 with respect to the values of Ni and R1_dot.

  That is, the detection time constant τ is determined so as to increase as the detected value (current value) of the actual rotational speed Ni of the input unit 2 decreases. Further, the detection time constant τ is determined to be smaller as the estimated value (current value) of the change speed R1_dot of the actual rotational radius R1 of the rotational radius adjusting mechanism 4 is larger.

  Note that the detection time constant τ may be changed according to the changing speed R1_dot of the rotation radius R1 only when the polarity (direction) of R1_dot is a polarity in the direction in which the rotation radius R1 decreases. .

  As described above, the detection time constant τ of the maximum side envelope detection unit 82a is changed according to the rotational speed Ni of the input unit 2 and the change speed R1_dot of the rotational radius R1, so that it does not depend on the values of Ni and R1_dot. In addition, the detection time constant τ (= Rd · C) can always be set so as to satisfy the condition of the expression (1).

  Therefore, the maximum side envelope detection unit 82a can appropriately generate a maximum side envelope detection signal indicating the maximum peak value side envelope of the phase signal regardless of the values of Ni and R1_dot.

  The minimum envelope detector 82b is the same as the maximum envelope detector 82a. That is, as shown in FIG. 8B, the minimum side envelope detector 82b differs from the maximum side envelope detector 82a only in the direction of the diode 92b, and the other configurations are the maximum side envelope detector. It is the same as the part 82a. In FIG. 8B, the subscript “b” is used in place of the subscript “a” in the reference numerals indicating the components (diodes and the like) corresponding to the respective components of the maximum side envelope detector 82a. doing.

  Further, the capacitance value C of the capacitive element 94b of the minimum side envelope detector 82b is set to be the same as or substantially the same as that of the maximum side envelope detector 82a. Further, the resistance value Rd of the resistance element 93b (variable resistance) of the minimum envelope detector 82b is determined according to the detected value of the rotational speed Ni of the input unit 2 and the estimated value of the change speed R1_dot of the rotational radius R1. It is controlled by the time constant control unit 96b so as to be the same or substantially the same as that of the maximum side envelope detection unit 82a.

  For this reason, the minimum envelope detector 82b can appropriately generate a minimum envelope detection signal indicating the minimum peak value side envelope of the phase signal, regardless of the values of Ni and R1_dot.

  Specifically, in the state where the voltage value of the phase signal input to the minimum side envelope detector 82b becomes a negative voltage value and decreases toward the minimum peak value, the minimum side envelope detector 82b. The capacitive element 94b is charged through the diode 92b. In this case, since the capacitance value C of the capacitive element 94b is set in the same manner as the maximum envelope detector 82a, the voltage of the capacitive element 94b quickly follows the voltage value of the phase signal and rises to the minimum peak value.

  Then, when the voltage value of the phase signal reaches the minimum peak value and then rises from the minimum peak value, the diode 92b of the minimum side envelope detection unit 82b is in a reverse bias state, so that the capacitive element 94b becomes the resistance element 93b. Discharge through.

  In this case, since the detection time constant τ (= Rd · C) of the minimum envelope detector 82b is set in the same manner as the maximum envelope detector 82a, the voltage of the capacitive element 94b is determined from the voltage value of the phase signal. Also decays slowly. Then, when the voltage value of the phase signal becomes a negative voltage value again and decreases toward the minimum peak value, and when the magnitude of the voltage value becomes larger than the voltage of the capacitive element 94b, the capacitive element 94b. Is again charged through the diode 92b to the voltage of the minimum peak value.

  In this way, charging / discharging of the capacitive element 94b is performed in accordance with the oscillation of the voltage value of the phase signal, so that a minimum envelope detection signal is generated as shown in FIG. The minimum envelope detection signal has a voltage value that fluctuates in the vicinity of the minimum peak value of the phase signal.

  Returning to FIG. 7, as described above, the maximum side envelope detection signal and the minimum side envelope detection signal generated by the maximum side envelope detection unit 82 a and the minimum side envelope detection unit 82 b are sent to the differential signal generation unit 83. Entered. The differential signal generation unit 83 includes a subtraction circuit 83a and a low-pass filter 83b (low-pass characteristic filter) as shown in the figure.

  The maximum side envelope detection signal and the minimum side envelope detection signal are input to the subtraction circuit 83a. Then, the subtraction circuit 83a generates a voltage value signal (hereinafter referred to as difference signal A) obtained by subtracting the voltage value of the minimum side envelope detection signal from the voltage value of the maximum side envelope detection signal.

  As shown in FIG. 11, the difference signal A generated by the subtracting circuit 83a is a DC voltage signal whose voltage value slightly fluctuates in an approximate sawtooth waveform. In this case, since the timing at which the voltage value of the phase signal becomes the maximum peak value and the timing at which the voltage value becomes the minimum peak value has a time difference corresponding to a half cycle of the phase signal, a slight sawtooth wave variation included in the difference signal A The frequency of the component is twice the vibration frequency fc of the phase signal.

  Further, the difference signal A is input to the low pass filter 83b. The low-pass filter 83b is a filter that generates a signal obtained by smoothing the difference signal A (hereinafter referred to as difference signal B) by removing minute fluctuation components from the difference signal A.

  Here, since the vibration frequency fc of the phase signal is in accordance with the rotational speed Ni of the input unit 2, the frequency (= 2 · fc) of the sawtooth-like minute fluctuation component included in the difference signal A is also calculated. 2 according to the rotational speed Ni.

  Therefore, in the present embodiment, in order to remove the sawtooth-like minute fluctuation component included in the difference signal A by the low-pass filter 83b, the difference signal generation unit 83 uses the cut-off frequency fa of the low-pass filter 83b as the rotation of the input unit 2. It changes according to the detected value of speed Ni.

  Specifically, for example, as shown in FIG. 12, the cutoff frequency fa is set to a value of Ni so that the cutoff frequency fa of the low-pass filter 83b increases as the detected value (current value) of the rotational speed Ni increases. It changes according to. In this case, the detected value of the rotational speed Ni is the same as that used in the maximum envelope detector 82a and the minimum envelope detector 82b.

  By changing the cut-off frequency fa of the low-pass filter 83b in this way, a minute fluctuation component having a sawtooth wave shape from the difference signal A regardless of the rotational speed Ni of the input unit 2 (not depending on the vibration frequency of the phase signal). Can be appropriately removed by the low-pass filter 83b.

  Therefore, the differential signal B output from the low-pass filter 83b is a smooth signal in a form in which the differential signal A is smoothed (or averaged) as shown by a broken line graph in FIG.

  Supplementally, the frequency of the sawtooth-like minute fluctuation component included in the difference signal A is twice the frequency of the vibration frequency fc of the phase signal, so the cut-off frequency fa of the low-pass filter 83b is set to a relatively high frequency. it can. For this reason, the phase delay of the output signal (difference signal B) with respect to the input signal (difference signal A) of the low-pass filter 83b can be sufficiently reduced.

  The difference signal generation unit 83 uses the difference signal B generated by the low-pass filter 83b as described above to indicate a difference voltage value (average voltage value) between the maximum side envelope detection signal and the minimum side envelope detection signal. Output as a signal.

  The difference signal B output from the difference signal generation unit 83 is input to the difference correction signal generation unit 84 illustrated in FIG.

  Since the difference signal B is obtained by passing the difference signal A including a sawtooth-like minute fluctuation component through the low-pass filter 83b, the magnitude of the voltage value of the difference signal B is the maximum peak value and the minimum peak value of the phase signal. And the difference voltage value (which corresponds to the actual phase change width θ2 of the swing link 18) is slightly smaller.

  Therefore, the difference correction signal generation unit 84 generates a difference correction signal by correcting the magnitude of the voltage value of the input difference signal B.

  In this case, the difference correction signal generation unit 84 generates a difference correction signal obtained by correcting the difference signal B by a multiplication circuit that converts the voltage value of the difference signal B into a voltage value obtained by multiplying the gain G (≧ 1). Generate. The gain G defines the degree of correction of the difference signal B (specifically, the ratio of the voltage value of the difference correction signal to the voltage value of the difference signal B).

  Here, the degree of decrease in the voltage value of the difference signal B with respect to the voltage value of the difference between the maximum peak value and the minimum peak value of the phase signal (hereinafter referred to as phase change width equivalent voltage) is the vibration frequency of the phase signal or the maximum side envelope. This is in accordance with the detection time constant τ of the line detector 82a and the minimum envelope detector 82b.

  The vibration frequency of the phase signal changes according to the rotational speed Ni of the input unit 2. In the present embodiment, the detection time constant τ is variably set according to the rotational speed Ni of the input unit 2 and the change speed R1_dot of the rotational radius R1 of the rotational radius adjusting mechanism 4.

  Therefore, the difference correction signal generation unit 84 determines the value of the gain G, the detected value of the rotational speed Ni of the input unit 2, the set value of the detection time constant τ by the time constant control unit 96a or 96b, and the rotation radius R1. Is variably determined according to one of the estimated values of the change rate R1_dot.

  In the present embodiment, the difference correction signal generation unit 84 converts the value of the gain G into the detected value of the rotational speed Ni of the input unit 2 and the set value of the detection time constant τ by the time constant control unit 96a or 96b. In response, the gain G value is variably determined using a map created in advance.

  Specifically, the value of the gain G has a tendency as shown in FIG. 13, and the detection value (current value) of the rotational speed Ni of the input unit 2 and the detection time constant τ set by the time constant control unit 96a or 96b are set. It is determined according to the value (current value).

  That is, the value of the gain G is determined so as to increase as the detected value of the rotational speed Ni of the input unit 2 decreases. This is because the smaller the detected value of the rotational speed Ni of the input unit 2 is, the smaller the vibration frequency of the phase signal is, so that each of the capacitive elements 94a of the maximum side envelope detector 82a and the minimum side envelope detector 82b, This is because the decay of the voltage further proceeds until the discharge duration time of 94b becomes longer and the voltages of the capacitive elements 94a and 94b rise again.

  Further, the value of the gain G is determined so as to increase as the set value of the detection time constant τ decreases. This is because the smaller the set value of the detection time constant τ, the easier the discharge of the capacitive elements 94a and 94b of the maximum side envelope detection unit 82a and the minimum side envelope detection unit 82b progresses earlier. This is because the voltage attenuation of 94a and 94b proceeds earlier.

  The detection value of the rotational speed Ni of the input unit 2 used for determining the value of the gain G is the same as that used in the maximum side envelope detection unit 82a and the minimum side envelope detection unit 82b. The set value of the detection time constant τ used to determine the value of the gain G is a difference from the time constant control unit 96a of the maximum side envelope detection unit 82a or the time constant control unit 96b of the minimum side envelope detection unit 82b. The correction signal generation unit 84 is provided.

  The difference correction signal generation unit 84 generates a difference correction signal obtained by correcting the difference signal B by multiplying the voltage value of the difference signal B by the gain G determined as described above.

  As a result, a difference correction signal is generated as shown in FIG. The difference correction signal generated in this way is a voltage signal whose voltage value accurately matches the phase change width equivalent voltage.

  When determining the value of the gain G, instead of the detection time constant τ, the estimated value of the change rate R1_dot of the rotation radius R1 of the rotation radius adjustment mechanism 4 (maximum side envelope detection unit 82a and minimum side envelope detection) (Estimated value used in the part 82b) may be used. In this case, the difference correction signal generation unit 84 determines that the value of the gain G increases as the estimated value of R1_dot increases.

  The difference correction signal generated by the difference correction signal generation unit 84 as described above is input to the phase change width estimation processing unit 85 shown in FIG.

  The phase change width estimation processing unit 85 includes an arithmetic processing circuit including a CPU or a processor. Then, the difference correction signal is taken into the phase change width estimation processing unit 85 via an A / D converter (not shown).

  The phase change width estimation processing unit 85 converts the digital value indicating the voltage value of the difference correction signal into a phase change width θ2 using a map created in advance as a relationship between the voltage value and the phase change width θ2. Convert to value. Thereby, the estimated value of the phase change width θ2 of the swing link 18 is obtained.

  In this case, since the voltage value of the difference correction signal matches the phase change width equivalent voltage with high accuracy, the estimated value of the phase change width θ2 of the swing link 18 obtained from the voltage value is also It matches the actual value with high accuracy.

  Note that the estimated value of the phase change width θ2 obtained by the phase change width estimation processing unit 85 is given to a control device or the like that is responsible for the operation control of the continuously variable transmission 1. The estimated value of the phase change width θ2 is used for control of the gear ratio of the continuously variable transmission 1, detection processing for the presence or absence of abnormal operation of the continuously variable transmission 1, and the like.

  The above is the details of the operation of the operation state estimation device 71 of the present embodiment.

  According to the operation state estimation device 71, the phase change width θ2 of the swing link 18 accompanying the rotation of the input unit 2 can be accurately estimated in real time.

  For example, as illustrated in FIG. 14, the rotation radius R1 of the rotation radius adjusting mechanism 4 changes, and as a result, the voltage value of the difference between the maximum peak value and the minimum peak value of the phase signal (that is, the voltage corresponding to the phase change width) varies. Even in such a situation, the difference correction signal can be generated so that the voltage value of the difference correction signal matches the phase change width equivalent voltage with high accuracy.

  As a result, the estimation accuracy of the phase change width θ2 of the swing link 18 can be increased.

  Next, some modifications of the embodiment described above will be described.

  In the embodiment, a sensor other than the distance detection sensor 72 may be used as a sensor for generating a phase signal. For example, an angle sensor such as a potentiometer whose resistance value changes according to the swing angle (phase) of the swing link 18 may be used instead of the distance detection sensor 72. Alternatively, for example, a magnet is mounted on the outer surface of the annular portion 18d of the swing link 18 so that the magnetic flux changes in accordance with the swing of the swing link 18, and a distance sensor is used to detect the magnetic flux of the magnet. It may be used instead of the sensor 72. As described above, various sensors can be used as the sensor for generating the phase signal.

  In the above embodiment, the phase detection unit 81 includes the subtraction circuit 81b. However, when the rotation radius R1 of the rotation radius adjustment mechanism 4 is zero, the output of the sensor such as the distance detection sensor 72 becomes zero. As described above, the output of the sensor may be adjusted. In that case, the subtraction circuit 81b is unnecessary.

  In the above embodiment, the maximum side envelope detector 82a and the minimum side envelope detector 82b have the circuit configurations shown in FIGS. 8 (a) and 8 (b). However, these envelope detectors 82a and 82b may have other circuit configurations. For example, the envelope detectors 82a and 82b may include a buffer, an operational amplifier, and the like. Further, the capacitive elements 94a and 94b may be capacitive elements other than capacitors.

  Further, the whole or a part of the circuit unit 73 of the operation state estimation device 71 can be configured by a digital circuit including a processor or the like.

  DESCRIPTION OF SYMBOLS 1 ... Continuously variable transmission, 2 ... Input part, 3 ... Output shaft, 4 ... Turning radius adjustment mechanism, 15 ... Connecting rod, 17 ... One-way clutch (one-way rotation prevention mechanism), 18 ... Swing link, 18d ... Annular portion, 20 ... leverage crank mechanism, 21 ... mounting pin, 22 ... detected member, 60 ... transmission case, 71 ... operating state estimation device, 72 ... distance detection sensor, 81 ... phase detector, 82a ... maximum side envelope Line detection unit, 82b ... minimum side envelope detection unit, 83 ... difference signal generation unit, 83b ... low pass filter (low pass characteristic filter), 84 ... difference correction signal generation unit, 85 ... phase change width estimation processing unit.

Claims (7)

An input unit to which the driving force of the driving source for traveling is transmitted;
An output shaft having a rotation center axis parallel to the rotation center axis of the input unit;
A turning radius adjusting mechanism capable of adjusting a turning radius and rotatable about a rotation center axis of the input unit, a swing link pivotally supported by the output shaft, the turning radius adjusting mechanism, and the swing link; A lever for connecting the lever, and a lever crank mechanism for converting the rotational motion of the rotational radius adjusting mechanism into the swing motion of the swing link;
When the swing link is about to rotate to one side with respect to the output shaft about the rotation center axis of the output shaft, the swing link is fixed to the output shaft and is about to rotate to the other side. A one-way rotation prevention mechanism that idles the swing link with respect to the output shaft when
A transmission case that houses the lever crank mechanism and the one-way rotation prevention mechanism,
The swing link is an operating state estimation device for a continuously variable transmission having a swing end connected to the connecting rod and an annular portion supported by the output shaft,
It has a sensor whose output changes according to the change of the phase of the swing link during the swinging motion of the swing link, and the output from the sensor changes monotonously with respect to the change of the phase of the swing link A phase detector that generates a phase signal that is a voltage signal exhibiting
The maximum side envelope detection unit and the minimum side envelope detection that respectively generate a detection signal indicating an envelope on the maximum peak value side and a detection signal indicating an envelope on the minimum peak value side of the phase signal generated by the phase detection unit. And
A differential signal generation unit that generates a differential signal indicating a voltage value of a difference between the detection signal generated by the maximum side envelope detection unit and the detection signal generated by the minimum side envelope detection unit;
The difference which produces | generates the difference correction signal which has a voltage value according to the change width of the phase at the time of the rocking | fluctuation movement of the said rocking | fluctuation link by correct | amending the magnitude | size of the voltage value of the difference signal which the said difference signal generation part produced | generated. A correction signal generation unit;
A phase change width estimation processing unit that estimates a phase change width during the swing motion of the swing link from the voltage value of the difference correction signal generated by the difference correction signal generation unit;
The difference correction signal generation unit corrects the magnitude of the voltage value of the difference signal so as to change the degree of correction of the voltage value of the difference signal according to at least the rotation speed of the input unit. An operation state estimation device for a continuously variable transmission, characterized in that it is configured. The operation state estimation device for a continuously variable transmission according to claim 1,
The difference correction signal generation unit is configured so that a ratio of a voltage value magnitude of the difference correction signal to a voltage value magnitude of the difference signal increases as the rotation speed of the input unit decreases. An apparatus for estimating the operating state of a continuously variable transmission, wherein the voltage value is corrected. In the operation state estimation device for a continuously variable transmission according to claim 1 or 2,
The maximum-side envelope detection unit and the minimum-side envelope detection unit have a detection time constant according to the rotation speed of the input unit so that the detection time constant increases as the rotation speed of the input unit decreases. An operation state estimation device for a continuously variable transmission, characterized in that the constant is changed. The operation state estimation device for a continuously variable transmission according to claim 3,
The maximum envelope detector and the minimum envelope detector each have a detection time constant that increases as the rotational speed of the input unit decreases, and is further estimated from the operating state of the turning radius adjustment mechanism. The detection time constant is changed according to the rotational speed of the input unit and the temporal change rate of the rotational radius so that the larger the magnitude of the temporal change rate of the rotational radius is, the smaller is the smaller. Configured,
The difference correction signal generation unit adds the degree of correction of the voltage value of the difference signal to the rotation speed of the input unit, and further, the rate of change of the rotation radius with time, and the maximum envelope detector Or, it is configured to correct the magnitude of the voltage value of the differential signal so as to change according to any one of the detection time constants of the minimum envelope detector. An operation state estimation device for a continuously variable transmission. The operation state estimation device for a continuously variable transmission according to claim 4, wherein the difference correction signal generation unit is configured such that a ratio of a voltage value magnitude of the difference correction signal to a voltage value magnitude of the difference signal is the input unit. The smaller the rotation speed of the larger, the larger the magnitude of the rate of change of the rotation radius with time, or the detection time constant of the maximum side envelope detector or the minimum side envelope detector. The operation state estimation device for a continuously variable transmission is configured to correct the magnitude of the voltage value of the difference signal so that the ratio becomes larger as the ratio is smaller. In the operation state estimation device for a continuously variable transmission according to any one of claims 1 to 5,
The difference signal generation unit is obtained by inputting a voltage signal of a difference between the detection signal generated by the maximum side envelope detection unit and the detection signal generated by the minimum side envelope detection unit to a low-pass characteristic filter. The output of the filter is configured to generate the difference signal,
The low-pass characteristic filter is configured to change the cutoff frequency in accordance with the rotational speed of the input unit so that the cutoff frequency increases as the rotational speed of the input unit increases. An operation state estimating device for a continuously variable transmission. The operation state estimation device for a continuously variable transmission according to any one of claims 1 to 6,
In the continuously variable transmission, a plurality of mounting pins provided on the outer peripheral surface of the annular portion of the swing link so as to extend radially outward of the annular portion, and slidably attached to the plurality of mounting pins And a detected member that is provided,
The sensor is configured by a distance detection sensor that is fixed to the transmission case so as to face an outer surface of the detected member and generates an output corresponding to a distance to the detected member.
The outer surface shape of the detected member is an operating state of the continuously variable transmission, wherein the distance from the outer surface of the detected member to the distance detection sensor changes according to the phase of the swing link Estimating device.