JP2008121819A - Vibration suppression device for power transmission mechanism, vibration suppression method, program realizing the method by computer and recording medium stored with the program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress vibration generated in a power transmission mechanism while taking into consideration a slip amount of a belt. <P>SOLUTION: ECU executes the program including a step (S100) for detecting the number of revolution NIN and the number of revolution NOUT; a step (S102) for detecting a gear ratio; a step (S104) for detecting a slip amount; a step (S106) for reading out vibration characteristic; a step (S108) for calculating a correction value based on the slip amount; a step (S110) for calculating a correction value based on vibration suppression; a step (S112) for producing a reverse phase sound signal; and a step (S114) for transmitting the reverse phase sound signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technology for suppressing vibration of a power transmission mechanism, and in particular, suppresses vibration by generating vibration in an opposite phase to vibration generated in a power transmission mechanism in which power is transmitted by two pulleys and a belt. Regarding technology.

  The vehicle is equipped with, for example, an automatic transmission that adjusts the transmission gear ratio in accordance with the traveling state of the vehicle as a power transmission mechanism. One such automatic transmission may be equipped with a belt-type continuously variable transmission (CVT) that continuously adjusts the gear ratio.

  This CVT can efficiently draw out the engine output, and is excellent in improving fuel consumption and running performance. As one of the practically used CVTs, there is one in which an endless metal belt and a pair of pulleys are used, and the effective diameter of the pulleys is changed by hydraulic pressure to continuously achieve a continuously variable transmission.

  The endless metal belt is configured by combining a number of elements, for example. The endless metal belt is used by being wound around an input side pulley attached to the input shaft and an output side pulley attached to the output shaft. The input side pulley and the output side pulley are each provided with a pair of sheaves whose groove width can be changed steplessly. By changing the groove width, the winding radius of the endless metal belt with respect to the input side pulley and the output side pulley changes, Thereby, the rotation speed ratio between the input shaft and the output shaft, that is, the gear ratio can be continuously changed continuously.

  Thus, when a belt is used as a means for power transmission, vibration generated during operation becomes a problem. Such vibration is generated by a change in the contact state between the belt and the pulley. The vibration is transmitted to the rotating shaft, the bearing, and the casing, and the case is generated by resonance.

  As a technique for suppressing vibration in such a power transmission mechanism, for example, Japanese Patent Laying-Open No. 2005-351390 (Patent Document 1) is a belt type that suppresses vibrations of pulleys and belts by combining vibration waves and reduces noise. A continuously variable transmission is disclosed. This belt-type continuously variable transmission is a belt-type continuously variable transmission in which an endless belt is wound around two pulleys. The belt-type continuously variable transmission is provided with an engaging means for transmitting torque between the endless belt and the endless belt that is sequentially sandwiched between opposing wall surfaces of the pulley by the belt being wound around the pulley. The engaging means includes a first group of engaging members that cause the transmission to vibrate at a constant cycle with respect to the rotation of the pulley due to an impact when pinched by the pulley, and a phase shift of the same cycle to cancel the constant cycle of vibration. And a second group of engaging members that generate vibrations.

According to this belt-type continuously variable transmission, by applying antiphase vibrations at the same frequency, the antiphase vibrations cancel each other, so that the belt and pulley vibrations can be suppressed.
JP-A-2005-351390

  However, in a belt-type continuously variable transmission, slippage (also referred to as slip in the following description) occurs when the rotational fluctuation occurs during acceleration or the like. Even when the operation of the belt type continuously variable transmission is in a steady state, a slight belt slip occurs. When the belt slips, the mode (for example, phase or frequency) of the generated vibration may change as compared with the case where the belt does not slip.

  In the above-mentioned publication, no consideration is given to belt slipping. Therefore, when belt slippage occurs, vibration generated due to driving of the belt may not be canceled.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to vibrate the power transmission mechanism that effectively suppresses vibrations generated in the power transmission mechanism in consideration of the amount of slip of the belt. It is an object to provide a suppression device, a vibration suppression method, a program for realizing the method by a computer, and a recording medium on which the program is recorded.

  A vibration suppression device for a power transmission mechanism according to a first aspect of the present invention is a vibration suppression device for a power transmission mechanism that is mounted on a vehicle and includes at least two pulleys and a belt wound around the pulleys. The pulley includes an input-side first pulley and an output-side second pulley. The vibration suppressing device includes a detection unit for detecting a physical quantity related to vibration caused by driving the belt, and a vibration having an opposite phase to the vibration phase at the time of driving the belt based on the detected physical quantity. Generated on the basis of the detected slip amount, the generating means for generating the waveform, the slip amount detecting means for detecting the slip amount at the time of rotation in the first pulley and the second pulley Correction means for correcting the waveform of the antiphase vibration and vibration generation means for generating the corrected vibration are included. The vibration suppression method for a power transmission mechanism according to a sixth aspect of the invention has the same configuration as the vibration suppression apparatus for a power transmission mechanism according to the first aspect of the invention.

  According to the first or sixth aspect of the invention, the phase of the vibration generated when the belt is driven is opposite to the phase generated based on the detected physical quantity (for example, the rotation speed of the first pulley and the rotation speed of the second pulley). By correcting the vibration waveform to be based on the detected slip amount, an anti-phase vibration corresponding to a change in the vibration mode (for example, a change in vibration frequency or phase) caused by the belt slip is generated. Can be made. Therefore, it is possible to accurately suppress vibration caused by driving the belt. Therefore, it is possible to provide a vibration suppressing device for a power transmission mechanism that effectively suppresses vibration generated in the power transmission mechanism in consideration of the amount of belt slip.

  In the vibration suppressing device for a power transmission mechanism according to the second invention, in addition to the configuration of the first invention, the detecting means detects the first rotation speed for detecting the first rotation speed of the first pulley. Detection means and second rotation speed detection means for detecting the second rotation speed of the second pulley. The slip amount detection means further includes means for detecting the slip amount from the difference between the first rotation speed and the second rotation speed. The vibration suppression method for a power transmission mechanism according to a seventh aspect has the same configuration as the vibration suppression apparatus for a power transmission mechanism according to the second aspect.

  According to the second or seventh invention, the vibration generated due to the driving of the belt tends to depend on the rotational speed of the pulley on the input / output side and the gear ratio. Therefore, the vibration generated due to the driving of the belt can be detected by detecting the first rotation speed and the second rotation speed. Further, the slip amount can be detected from the difference between the first rotation speed and the second rotation speed. By correcting the anti-phase vibration waveform generated based on the detected slip amount, the anti-phase vibration corresponding to the change of the vibration mode (for example, the change of the frequency or the phase of the vibration) caused by the belt slip. Can be generated.

  In the vibration suppressing device for a power transmission mechanism according to the third invention, in addition to the structure of the second invention, the belt includes a plurality of elements. The vibration suppressing device further includes movement detection means for detecting the movement state of the element. The generating means is caused by driving the belt based on one of the first rotation speed and the second rotation speed and a ratio between the first rotation speed and the second rotation speed. And a means for generating a vibration waveform having a phase opposite to the phase of the estimated vibration waveform based on the detected movement state. The vibration suppression method for the power transmission mechanism according to the eighth invention has the same configuration as the vibration suppression device for the power transmission mechanism according to the third invention.

  According to the third or eighth invention, the vibration generated due to the driving of the belt tends to depend on the rotational speed of the pulley on the input / output side and the gear ratio. Therefore, it occurs due to the driving of the belt based on the rotation speed of either the first rotation speed or the second rotation speed and the ratio between the first rotation speed and the second rotation speed. By estimating the vibration waveform, it is possible to detect the vibration generated due to the driving of the belt without newly providing a device for detecting the vibration. Further, by detecting the movement state of the element, it is possible to accurately detect the phase of vibration caused by driving the belt.

  In the vibration suppressing device for a power transmission mechanism according to the fourth invention, in addition to the configuration of any one of the first to third inventions, the correction means is a specification of the components of the power transmission mechanism in addition to the slip amount. Means for correcting the generated anti-phase vibration waveform based on characteristics including transmission sensitivity and dynamic stiffness. The vibration suppression method for a power transmission mechanism according to a ninth aspect has the same configuration as the vibration suppression apparatus for a power transmission mechanism according to the fourth aspect.

  According to the fourth or ninth invention, by correcting the generated anti-phase vibration waveform based on the characteristics including the specification, transmission sensitivity and dynamic rigidity of the components (for example, belt) of the power transmission mechanism. Thus, it is possible to accurately generate a vibration waveform having an opposite phase corresponding to vibration generated due to the driving of the belt. Therefore, vibration generated when the belt is driven can be accurately suppressed.

  In the vibration suppressing device for a power transmission mechanism according to the fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the power transmission mechanism is a belt-type continuously variable transmission mechanism. The vibration suppression method for a power transmission mechanism according to a tenth invention has the same configuration as the vibration suppression device for a power transmission mechanism according to a fifth invention.

  According to the fifth or tenth aspect of the invention, the vibration generated when the belt is driven can be suppressed by canceling the vibration of the belt-type continuously variable transmission mechanism when the belt is driven by generating an anti-phase vibration.

  A program according to an eleventh aspect of the invention is a program for realizing the power transmission mechanism vibration suppression method according to any of the sixth to tenth aspects of the invention by a computer, and the recording medium according to the twelfth aspect of the invention is the sixth aspect. The medium which recorded the program which implement | achieves the vibration suppression method of the power transmission mechanism which concerns on any one of 10 invention with a computer.

  According to the eleventh or twelfth invention, the vibration suppressing method for a power transmission mechanism according to any of the sixth to tenth inventions can be realized using a computer (which may be general purpose or dedicated).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, a power train of a vehicle on which the vibration suppressing device for a power transmission mechanism according to the present embodiment is mounted will be described. In the present embodiment, the power transmission mechanism will be described as a belt-type continuously variable transmission. However, the power transmission mechanism is not particularly limited as long as it is a power transmission mechanism having a pulley and a belt. For example, an auxiliary machine such as a water pump, an air conditioner compressor, and an alternator may be provided in a power transmission mechanism that drives with a belt and a pulley using an engine as a power source.

  As shown in FIG. 1, the power train of the vehicle includes an engine 100, a torque converter 200, a forward / reverse switching device 290, a belt-type continuously variable transmission mechanism (hereinafter simply referred to as a transmission mechanism) 300, a differential, The gear 800, the ECU 1000, and a hydraulic control unit 1100 are included. The belt type continuously variable transmission includes a torque converter 200, a forward / reverse switching device 290, a transmission mechanism 300, and a hydraulic control unit 1100.

  The output shaft of engine 100 is connected to the input shaft of torque converter 200. Engine 100 and torque converter 200 are connected by a rotating shaft. Therefore, output shaft rotational speed NE (engine rotational speed NE) of engine 100 detected by the engine rotational speed sensor and input shaft rotational speed (pump rotational speed) of torque converter 200 are the same.

  The torque converter 200 includes a lock-up clutch 210 that directly connects the input shaft and the output shaft, a pump impeller 220 on the input shaft side, a turbine impeller 230 on the output shaft side, and a one-way clutch 250. It is comprised from the stator 240 which expresses an amplification function. Torque converter 200 and transmission mechanism 300 are connected by a rotating shaft. The output shaft rotational speed NT (turbine rotational speed NT) of the torque converter 200 is detected by the turbine rotational speed sensor 400.

  Transmission mechanism 300 is connected to torque converter 200 via forward / reverse switching device 290. The transmission mechanism 300 includes an input-side primary pulley 500, an output-side secondary pulley 600, and a metal belt 700 wound around the primary pulley 500 and the secondary pulley 600.

  In the present embodiment, metal belt 700 is an endless belt configured by laminating a plurality of elements (not shown) formed from a metal flat plate in a predetermined shape along a ring formed in a ring shape. It is. Each element is formed with an inclined surface in contact with the sheave of the pulley on both sides.

  Primary pulley 500 includes a fixed sheave fixed to the primary shaft and a movable sheave supported on the primary shaft so as to be slidable only. The secondary pulley 600 includes a fixed sheave fixed to the secondary shaft and a movable sheave supported by the secondary shaft so as to be slidable only. The primary pulley rotation speed NIN (simply described as the rotation speed NIN in the following description) of the speed change mechanism 300 is determined by the primary pulley rotation speed sensor 410 by the secondary pulley rotation speed NOUT (in the following description, it is simply referred to as the rotation speed NIN). The rotation speed NOUT) is detected by the secondary pulley rotation speed sensor 420.

  These rotation speed sensors are provided to face the teeth of the rotation detection gear attached to the rotation shafts of the primary pulley and the secondary pulley and the drive shaft connected thereto. These rotation speed sensors are sensors that can detect slight rotations of the primary pulley that is the input shaft and the secondary pulley that is the output shaft of the speed change mechanism 300, and are generally referred to as, for example, semiconductor sensors. This is a sensor using a magnetoresistive element.

  Further, a gap sensor 430 is provided on the outer peripheral side of the belt 700 so as to face the elements of the belt 700. The gap sensor 430 is composed of a coil or the like, and outputs a signal based on the electromotive force according to the distance from the opposing element. That is, gap sensor 430 outputs a signal to ECU 1000 every time an element in opposing belt 700 passes. The gap sensor 430 is not particularly limited to the above-described configuration as long as the movement state of the element can be detected. Preferably, the gap sensor 430 is provided at a position where the influence of the movement of the belt 700 according to the speed change is as small as possible. The position where the influence of the movement of the belt 700 is small may be adapted by, for example, experiments.

  The forward / reverse switching device 290 includes a double pinion planetary gear, a reverse (reverse) brake, and an input clutch 310. In the planetary gear, the sun gear is connected to the input shaft, the carrier supporting the first and second pinions is connected to the primary fixed sheave, and the ring gear is used as a reverse brake that serves as a reverse friction engagement element. The input clutch 310 is interposed between the carrier and the ring gear. The input clutch 310 is also called a forward clutch or a forward clutch, and is always used in an engaged state when a vehicle other than the parking (P) position, the R position, and the N position moves forward.

  The ECU 1000 and the hydraulic control unit 1100 that control these power trains will be described.

  ECU 1000 receives a signal representing turbine rotational speed NT from turbine rotational speed sensor 400, a signal representing rotational speed NIN from primary pulley rotational speed sensor 410, and a signal representing rotational speed NOUT from secondary pulley rotational speed sensor 420, respectively. Entered.

  Hydraulic control unit 1100 includes a shift speed control unit 1110, a belt clamping pressure control unit 1120, a lockup engagement pressure control unit 1130, a clutch pressure control unit 1140, and a manual valve 1150. From ECU 1000, shift control duty solenoid (1) 1200 of hydraulic control unit 1100, shift control duty solenoid (2) 1210, belt clamping pressure control linear solenoid 1220, lockup solenoid 1230, and lockup engagement A control signal is output to the pressure control duty solenoid 1240.

  The amplifier 1002 amplifies the antiphase sound signal transmitted from the ECU 1000. The amplifier 1002 outputs the amplified antiphase sound signal to the speaker 1004. The speaker 1004 generates sound according to the antiphase sound signal output from the amplifier 1002.

  As the speaker 1004, an audio speaker provided in a vehicle interior may be used. Further, the speaker 1004 may be provided indoors separately from the audio speaker, may be provided in the engine room, may be provided in the speed change mechanism 300, and drives the belt 700. The position of the speaker 1004 is not particularly limited as long as the resulting vibration is canceled in the vehicle interior. Note that it is sufficient if vibration is generated, and the present invention is not limited to the speaker 1004. For example, instead of the speaker 1004, a device that generates vibration such as a vibrator may be used.

  In the power train having the above-described configuration, the present invention relates to a vibration waveform having an opposite phase to the vibration phase generated when the belt is driven based on a physical quantity related to the vibration caused by the driving of the belt 700 by the ECU 1000. To generate a sound based on the corrected anti-phase vibration or vibration waveform by correcting the anti-phase vibration waveform generated based on the rotational speed NIN and the slip amount based on the rotational speed NOUT. As described above, the amplifier 1002 is characterized in that an antiphase signal is transmitted.

  In the present embodiment, the “physical quantity related to the vibration caused by driving the belt 700” is described as the primary pulley rotation speed and the secondary pulley rotation speed. In particular, the primary pulley rotation speed and the secondary pulley are described. It is not limited to the number of rotations, and may be the number of rotations of the rotating body that rotates in conjunction with the rotation of the primary pulley or the secondary pulley.

  ECU 1000 calculates the gear ratio from the ratio between rotation speed NIN and rotation speed NOUT. ECU 1000 estimates a waveform of vibration generated due to driving of belt 700 based on either one of rotation speed NIN and rotation speed NOUT and the gear ratio. ECU 1000 generates a vibration waveform having a phase opposite to that of the estimated vibration waveform based on the movement state of the element detected by gap sensor 430. In the present embodiment, it is assumed that ECU 1000 estimates a waveform of vibration generated due to driving of belt 700, based on rotation speed NIN and speed ratio.

  Further, ECU 1000 detects the slip amount from the difference between rotation speed NIN and rotation speed NOUT. ECU 1000 corrects the generated anti-phase vibration waveform based on the detected slip amount.

  ECU 1000 outputs an antiphase sound signal based on the corrected vibration waveform from speaker 1004 via amplifier 1002.

  Note that the ECU 1000 may generate a vibration having an antiphase after correcting the vibration generated based on the slip amount. Alternatively, ECU 1000 may generate a vibration waveform having a phase opposite to that of the vibration generated due to driving of belt 700 based on rotation speed NIN, the gear ratio, and the slip amount.

  FIG. 2 shows a functional block diagram of ECU 1000 included in the vibration suppressing device for the power transmission mechanism according to the present embodiment.

  ECU 1000 includes an input interface (hereinafter referred to as input I / F) 1010, an arithmetic processing unit 1020, a storage unit 1050, and an output interface (hereinafter referred to as output I / F) 1040.

  The input I / F 1010 receives the primary pulley rotational speed signal from the primary pulley rotational speed sensor 410, the secondary rotational speed signal from the secondary pulley rotational speed sensor 420, and the gap signal from the gap sensor 430, and receives an arithmetic processing unit. To 1020.

  The arithmetic processing unit 1020 includes a gear ratio calculation unit 1022, a vibration waveform calculation unit 1024, a slip amount detection unit 1026, a slip amount correction processing unit 1028, a vibration characteristic correction processing unit 1030, and an antiphase sound generation control unit 1032. Including.

  The gear ratio calculation unit 1022 calculates a gear ratio from the ratio between the received rotation speed NIN and the rotation speed NOUT.

  The vibration waveform calculation unit 1024 calculates a vibration waveform having a phase opposite to that of the vibration generated due to the driving of the belt 700 based on the received rotational speed NIN and the calculated transmission gear ratio.

  Since the vibration generated due to the driving of the belt 700 is pure tone, it can be described by a sine wave equation. Therefore, the vibration waveform calculation unit 1024 estimates the frequency, amplitude, and phase based on the rotation speed NIN and the gear ratio. Thereby, it is possible to estimate the vibration generated due to the driving of the belt 700.

  The vibration estimation method is not particularly limited as long as a well-known technique is used. For example, the frequency and amplitude can be calculated using maps, tables, and mathematical formulas preliminarily measured by experiments from the rotational speed NIN and the gear ratio. Each phase may be estimated.

  More specifically, the vibration waveform calculation unit 1024 calculates the frequency of vibration generated using a map, a table, or a mathematical formula indicating the relationship between the rotation speed and the frequency based on the rotation speed of the rotation speed NIN, for example. You may make it estimate. Alternatively, the vibration waveform calculation unit 1024 may estimate the vibration frequency based on a signal from the gap sensor 430, for example. That is, the vibration waveform calculation unit 1024 may use the frequency of the signal output from the gap sensor 430 as the vibration frequency.

  Further, the vibration waveform calculation unit 1024 uses the map, table, or mathematical expression showing the relationship between the rotation speed, the transmission speed ratio, and the amplitude based on the rotation speed NIN or the rotation speed NOUT and the transmission gear ratio. May be estimated. The map, table, or mathematical expression showing the relationship between the rotational speed, the speed ratio, and the amplitude is based on the clamping pressure on the belt 700 or the rigidity of the components of the speed change mechanism 300 such as the belt 700 and pulleys 500 and 600, transmission sensitivity, and the like. It may be set numerically or experimentally.

  Furthermore, the vibration waveform calculation unit 1024 may estimate the phase of vibration generated due to the driving of the belt 700 based on a signal from the gap sensor 430, for example. That is, the vibration waveform calculation unit 1024 may use the phase of the signal output from the gap sensor 430 as the vibration phase. Preferably, it is desirable to estimate the vibration phase in correspondence with the distance from the vibration source (belt 700) to the passenger in the vehicle interior and the distance from the speaker 1004 to the passenger in the vehicle interior.

  The vibration waveform calculation unit 1024 calculates a vibration waveform having a phase opposite to the estimated vibration phase. That is, the vibration waveform calculation unit 1024 calculates a vibration waveform in which the phase is shifted by 180 degrees without changing the amplitude and frequency with respect to the estimated vibration phase. Note that the vibration waveform calculation unit 1024 may estimate the phase of vibration that is directly opposite in phase based on the signal output from the gap sensor 430.

  The slip amount detection unit 1026 calculates the slip amount from the difference between the rotation speed NIN and the rotation speed NOUT.

  The slip amount correction processing unit 1028 corrects the waveform of the antiphase vibration calculated by the vibration waveform calculation unit 1024 based on the slip amount detected by the slip amount detection unit 1026.

  Specifically, the slip amount correction processing unit 1028 corrects at least one of the phase and frequency of the calculated anti-phase vibration waveform based on the detected slip amount.

  For example, a map, table, or mathematical expression indicating the relationship between the slip amount and the phase correction value is stored in the storage unit 1050 in advance, and the slip amount correction processing unit 1028 determines the phase correction value based on the detected slip amount. May be calculated. The slip amount correction processing unit 1028 corrects the phase of the anti-vibration vibration waveform calculated by the vibration waveform calculation unit 1024 using the calculated phase correction value.

  Alternatively, for example, a map, table, or mathematical expression indicating the relationship between the slip amount and the frequency correction value is stored in the storage unit 1050 in advance, and the slip amount correction processing unit 1028 determines the frequency based on the detected slip amount. A correction value may be calculated. The slip amount correction processing unit 1028 corrects the frequency of the anti-phase vibration waveform calculated by the vibration waveform calculation unit 1024 using the calculated frequency correction value.

  The vibration characteristic correction processing unit 1030 is a vibration waveform having an antiphase vibration calculated by the vibration waveform calculation unit 1024 based on the specifications, load characteristics, and vibration characteristics of the components of the speed change mechanism 300 stored in the storage unit 1050 in advance. Correct the amplitude.

  The component of the speed change mechanism 300 is, for example, the belt 700, and the vibration characteristic correction processing unit 1030 includes specifications such as the number and length of elements of the belt 700, load characteristics such as torque transmission sensitivity, and the speed change mechanism 300. The vibration amplitude correction value may be calculated based on vibration characteristics such as dynamic rigidity and transmission sensitivity. The vibration characteristic correction processing unit 1030 corrects the amplitude of the anti-phase vibration waveform calculated by the vibration waveform calculation unit 1024 using the calculated amplitude correction value.

  The anti-phase sound generation control unit 1032 generates an anti-phase sound signal indicating the corrected anti-phase vibration waveform, and outputs the generated anti-phase sound signal to the amplifier 1002 via the output I / F 1040.

  In this embodiment, the transmission ratio calculation unit 1022, the vibration waveform calculation unit 1024, the slip amount detection unit 1026, the slip amount correction processing unit 1028, the vibration characteristic correction processing unit 1030, and the antiphase sound generation control unit 1032 are In addition, it is assumed that a CPU (Central Processing Unit) that is the arithmetic processing unit 1020 executes a program stored in the storage unit 1050 and functions as software. Also good. Such a program is recorded on a storage medium and mounted on the vehicle.

  The storage unit 1050 stores various types of information, programs, threshold values, maps, and the like, and data is read from or stored in the arithmetic processing unit 1020 as necessary.

  Hereinafter, with reference to FIG. 3, a control structure of a program executed by ECU 1000 included in the vibration suppressing device of the power transmission mechanism according to the present embodiment will be described.

  In step (hereinafter, step is referred to as S) 100, ECU 1000 detects rotation speed NIN and rotation speed NOUT.

  In S102, ECU 1000 detects a gear ratio from the ratio of detected rotation speed NIN and rotation speed NOUT.

  In S104, ECU 1000 detects the slip amount from the difference between rotation speed NIN and rotation speed NOUT. In S106, ECU 1000 reads vibration characteristics from the memory.

  In S108, ECU 1000 calculates phase and frequency correction values based on the slip amount. In S110, ECU 1000 calculates an amplitude correction value based on the vibration characteristics.

  In S112, ECU 1000 generates an antiphase sound signal. Specifically, ECU 1000 generates a waveform of vibration generated due to driving of belt 700 based on either one of rotation speed NIN and rotation speed NOUT and the gear ratio. Based on the signal from gap sensor 430, ECU 1000 generates a vibration waveform having a phase opposite to the phase of the generated vibration waveform. ECU 1000 adds the correction value calculated in S108 and S110 to the generated antiphase vibration waveform. The ECU 1000 generates an anti-phase sound signal indicating the corrected anti-phase vibration waveform. In S114, ECU 1000 transmits an antiphase sound signal to amplifier 1002.

  The operation of the vibration suppressing device for the power transmission mechanism according to the present embodiment based on the above-described structure and flowchart will be described with reference to FIG.

  For example, assume that the vehicle is in a stopped state. For example, when the driver moves the shift lever to the drive position, the speed change mechanism 300 enters the forward traveling state. When the vehicle starts, the speed change mechanism 300 is in the most decelerated state.

  When the driver depresses the accelerator pedal, the output and the rotational speed of the engine 100 increase. As the rotational speed of the engine 100 increases, the rotational speed NIN and the rotational speed NOUT in the speed change mechanism 300 start to increase.

  At this time, vibration due to driving of the belt 700 occurs through the following steps.

  (1) The belt 700 rotates in accordance with the rotation of the primary pulley 500 by the clamping pressure from the pulleys 500 and 600 and rotates the secondary pulley 600.

  (2) Vibration generated by the rotation of the belt 700 is transmitted to components of the speed change mechanism 300 such as a transmission case.

(3) The components of the speed change mechanism 300 resonate due to the transmitted vibration.
(4) Vibration is generated due to resonance of components of the speed change mechanism 300.

On the other hand, the vibration suppressing device for the power transmission mechanism according to the present embodiment operates as follows.
The rotation speed NIN and the rotation speed NOUT are detected according to the rotation of the primary pulley 500 and the secondary pulley 600 (S100). Further, a gear ratio is detected from the ratio between the rotational speed NIN and the rotational speed NOUT (S102). Further, the slip amount is detected from the difference between the rotational speed NIN and the rotational speed NOUT (S104). Further, vibration suppression stored in the memory is read (S106).

  Based on the detected slip amount, a correction value of the vibration frequency and phase is calculated (S108). Further, a correction value of the vibration amplitude is calculated based on the read vibration characteristic (S110).

  From the rotation speed NIN or the rotation speed NOUT, the gear ratio, the vibration frequency and phase correction values, and the vibration amplitude correction value, the vibration waveform having the opposite phase to the vibration phase caused by driving the belt 700 is obtained. The calculated anti-phase sound signal indicating the calculated vibration waveform is transmitted to the amplifier 1002 (S112, S114). The amplifier 1002 amplifies the antiphase sound signal and generates a sound based on the antiphase sound signal generated from the speaker 1004.

  The vibration resulting from resonance of the components of the speed change mechanism 300 and the vibration output from the speaker 1004 overlap. At this time, since all the vibrations have the same amplitude and the phases are opposite to each other, the vibration generated by the resonance and the vibration output from the speaker 1004 are indicated by a thick line in which two vibrations overlap in FIG. So that it is offset.

  Since vibration due to resonance of the components of the speed change mechanism 300 is suppressed, the sound caused by vibration due to driving of the belt 700 heard by the driver is quiet.

  As described above, according to the vibration suppressing device for a power transmission mechanism according to the present embodiment, the vibration generated based on the detected rotation speeds NIN and NOUT and having a phase opposite to that of the vibration at the time of driving the belt. Is corrected based on the detected slip amount, an anti-phase vibration waveform corresponding to a change in vibration frequency or phase caused by belt slip can be generated. Therefore, it is possible to accurately suppress vibration caused by driving the belt. Therefore, it is possible to provide a vibration suppressing device for a power transmission mechanism that effectively suppresses vibration generated in the power transmission mechanism in consideration of the amount of belt slip.

  Further, the vibration generated due to the driving of the belt tends to depend on the rotation speed and the gear ratio of the pulley on the input / output side. Accordingly, a new vibration is detected by estimating the vibration waveform caused by the driving of the belt based on the rotational speed and the gear ratio of either the rotational speed NIN or the rotational speed NOUT. Without providing this device, it is possible to detect vibrations caused by driving the belt. Further, by detecting the movement state of the element, it is possible to accurately detect the phase of vibration caused by driving the belt.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure for demonstrating the structure of the belt-type continuously variable transmission in this Embodiment. It is a functional block diagram which shows the structure of ECU in this Embodiment. It is a flowchart which shows the control structure of the program performed by ECU in this Embodiment. It is a figure for demonstrating operation | movement of the vibration suppression apparatus of the power transmission mechanism which concerns on this Embodiment.

Explanation of symbols

  100 engine, 200 torque converter, 210 lock-up clutch, 220 pump impeller, 230 turbine impeller, 240 stator, 250 one-way clutch, 290 forward / reverse switching device, 300 belt type continuously variable transmission mechanism, 310 input clutch, 400 turbine rotation Number sensor, 410 Primary pulley rotation speed sensor, 420 Secondary pulley rotation speed sensor, 430 Gap sensor, 500 Primary pulley, 600 Secondary pulley, 700 Belt, 800 Differential gear, 1000 ECU, 1002 Amplifier, 1004 Speaker, 1010 Input I / F 1020 Arithmetic processing unit 1022 Gear ratio calculation unit 1024 Vibration waveform calculation unit 1026 Slip amount detection unit 1028 Slip amount correction processing unit 1 30 vibration characteristic correction processing unit, 1032 antiphase sound generation control unit, 1040 output I / F, 1050 storage unit, 1100 hydraulic control unit, 1110 shift speed control unit, 1120 belt clamping pressure control unit, 1130 lockup engagement pressure control , 1140 Clutch pressure controller, 1150 Manual valve, 1200, 1210 Shift control duty solenoid, 12.20 Belt clamping pressure control linear solenoid, 1230 Lock-up solenoid, 1240 Lock-up engagement pressure control duty solenoid.

Claims (12)

A vibration suppressing device for a power transmission mechanism that is mounted on a vehicle and includes at least two pulleys and a belt wound around the pulleys, wherein the pulleys include a first pulley on an input side and a second pulley on an output side. Including pulleys,
Detecting means for detecting a physical quantity related to vibration caused by driving the belt;
Based on the detected physical quantity, generating means for generating a vibration waveform having a phase opposite to that of the vibration at the time of driving the belt;
Slip amount detection means for detecting the slip amount during rotation in the first pulley and the second pulley;
Correction means for correcting the generated anti-phase vibration waveform based on the detected slip amount;
A vibration suppressing device for a power transmission mechanism, comprising vibration generating means for generating the corrected vibration. The detection means includes
First rotational speed detection means for detecting a first rotational speed of the first pulley;
Second rotational speed detection means for detecting a second rotational speed of the second pulley,
The vibration suppression device for a power transmission mechanism according to claim 1, wherein the slip amount detection means further includes means for detecting a slip amount from a difference between the first rotation speed and the second rotation speed. The belt is composed of a plurality of elements,
The vibration suppression device further includes movement detection means for detecting the movement state of the element,
The generating means includes
Due to the driving of the belt based on the rotation speed of either the first rotation speed or the second rotation speed and the ratio of the first rotation speed to the second rotation speed. Means for estimating the vibration waveform produced by
The vibration suppressing device for a power transmission mechanism according to claim 2, further comprising means for generating a vibration waveform having a phase opposite to the phase of the estimated vibration waveform based on the detected movement state.   The correction means corrects the generated anti-phase vibration waveform based on characteristics including specifications, transmission sensitivity, and dynamic rigidity of the components of the power transmission mechanism in addition to the slip amount. The vibration suppressing device for a power transmission mechanism according to claim 1, comprising means.   The vibration suppressing device for a power transmission mechanism according to any one of claims 1 to 4, wherein the power transmission mechanism is a belt-type continuously variable transmission mechanism. A vibration suppressing method for a power transmission mechanism mounted on a vehicle and including at least two pulleys and a belt wound around the pulleys, wherein the pulleys include a first pulley on an input side and a second pulley on an output side. Including pulleys,
A detection step for detecting a physical quantity related to vibration caused by driving the belt;
Based on the detected physical quantity, a generation step for generating a vibration waveform having a phase opposite to that of the vibration at the time of driving the belt;
A slip amount detecting step for detecting a slip amount during rotation in the first pulley and the second pulley;
Based on the detected slip amount, a correction step of correcting the generated anti-phase vibration waveform;
A method for suppressing vibration of a power transmission mechanism, including the step of generating the corrected vibration. The detecting step includes
Detecting a first rotational speed of the first pulley;
Detecting a second rotational speed of the second pulley,
The method of suppressing vibration of a power transmission mechanism according to claim 6, wherein the slip amount detection step further includes a step of calculating a slip amount from a difference between the first rotation speed and the second rotation speed. The belt is composed of a plurality of elements,
The vibration suppressing device further includes a step of detecting a movement state of the element,
The generating step includes
Due to the driving of the belt based on the rotation speed of either the first rotation speed or the second rotation speed and the ratio of the first rotation speed to the second rotation speed. Estimating a vibration waveform generated as a result,
The method for suppressing vibration of a power transmission mechanism according to claim 7, further comprising: generating a vibration waveform having a phase opposite to the phase of the estimated vibration waveform based on the detected movement state.   The correction step includes a step of correcting the generated anti-phase vibration waveform based on characteristics including specification transmission sensitivity and dynamic rigidity of the components of the power transmission mechanism in addition to the slip amount. The vibration suppression method for a power transmission mechanism according to any one of claims 6 to 8.   The method for suppressing vibration of a power transmission mechanism according to any one of claims 6 to 9, wherein the power transmission mechanism is a belt-type continuously variable transmission mechanism.   The program which implement | achieves the vibration suppression method in any one of Claims 6-10 with a computer.   The recording medium which recorded the program which implement | achieves the vibration suppression method in any one of Claims 6-10 by computer.

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