JP2020051556A - Hydraulic control device and hydraulic control method - Google Patents

Abstract

To prevent belt holding pressure from decreasing in a process of suppressing hydraulic vibration.SOLUTION: A hydraulic control device according to the present invention is a hydraulic control device that suppresses hydraulic vibration generated in a hydraulic circuit, and comprises a vibration detection unit that detects hydraulic vibration generated in the hydraulic circuit, and a vibration control unit that when hydraulic vibration is detected by the vibration detection unit, outputs a vibration suppression signal that gives a hydraulic pressure for suppressing the hydraulic vibration. The vibration control unit reduces a signal component of the vibration suppression signal that acts in a direction of reducing the hydraulic pressure.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydraulic control device and a hydraulic control method for suppressing hydraulic vibration generated in a hydraulic circuit.

  2. Description of the Related Art Conventionally, a device controlled by hydraulic pressure, for example, a continuously variable transmission, includes a primary pulley that receives power of an engine, a secondary pulley that transmits power to driving wheels, and a belt that is wound around both pulleys. The continuously variable transmission achieves gear shifting by changing the diameter of the belt on both pulleys by hydraulic control. The hydraulic control is generally performed by controlling the hydraulic pressure of a hydraulic circuit to a target hydraulic pressure using an electromagnetic valve such as a linear solenoid. The control pressure by the linear solenoid is connected to the pulley of the continuously variable transmission, and is a clamping force that is a force for clamping the belt.

  In the hydraulic circuit, there are a number of mechanical valves in addition to the electromagnetic valve. Simultaneous movement of these valves may cause vibration in the hydraulic pressure in the hydraulic circuit. When such hydraulic vibration occurs, the hydraulic pressure periodically fluctuates around the target hydraulic pressure between the pressure increasing side and the pressure reducing side. In particular, when the oil pressure changes to a pressure reduction side from the target oil pressure, the oil pressure to the pulley becomes lower than the target oil pressure, that is, the belt clamping pressure decreases, which causes belt slippage.

  As described above, since the occurrence of hydraulic vibration may affect the control of the transmission, it is desirable to detect and suppress hydraulic vibration at an early stage.

  As a technique for detecting and suppressing hydraulic vibration, there is a technique described in Patent Document 1. In this technique, when the amplitude of the hydraulic pressure oscillating in the hydraulic circuit is equal to or greater than a predetermined value and the number of vibrations is equal to or greater than the predetermined number, it is detected that hydraulic oscillation has occurred. Further, in this technique, when the occurrence of hydraulic vibration is detected, a sinusoidal control signal for providing a hydraulic pressure having a phase opposite to the phase of the hydraulic vibration is output to control the vibration.

JP 2014-156926 A

  However, the technique of Patent Literature 1 has a problem in that hydraulic vibration is suppressed at an early stage. Specifically, in the technique of Patent Literature 1, vibration suppression control for suppressing hydraulic vibration is performed by outputting a sinusoidal control signal that provides a hydraulic pressure having a phase opposite to the phase of hydraulic vibration. In some cases, the hydraulic pressure that has been settled may greatly decrease from the target hydraulic pressure due to the control signal acting on the target hydraulic pressure. As the hydraulic pressure decreases, the belt clamping pressure decreases.

  An object of the present invention is to provide a hydraulic control device and a hydraulic control method capable of preventing a reduction in belt clamping pressure in a process of suppressing hydraulic vibration.

  A hydraulic control device according to the present invention is a hydraulic control device that suppresses hydraulic vibration generated in a hydraulic circuit, wherein the vibration detecting unit detects hydraulic vibration generated in the hydraulic circuit, and the vibration detecting unit detects hydraulic vibration. And a vibration control unit that outputs a vibration suppression signal that provides a hydraulic pressure that suppresses the hydraulic vibration, wherein the vibration control unit includes a signal component that acts in a direction of reducing the hydraulic pressure in the vibration suppression signal. Lower.

  ADVANTAGE OF THE INVENTION This invention can prevent that belt clamping pressure falls in the process of suppressing hydraulic vibration.

FIG. 1 is a diagram illustrating a configuration of a main part of a vehicle equipped with the hydraulic control device according to the embodiment. FIG. 2 is a block diagram illustrating a configuration of the hydraulic control device according to the embodiment. FIG. 3 is a diagram illustrating an operation of detecting hydraulic vibration in which the vibration frequency of the hydraulic pressure is equal to or higher than a predetermined frequency. FIG. 4 is a diagram illustrating an operation of detecting a hydraulic vibration in which the vibration frequency of the hydraulic pressure is equal to or lower than a predetermined frequency. FIG. 5 is a diagram showing an operation of detecting hydraulic vibration when the target hydraulic pressure changes suddenly. FIG. 6 is a flowchart illustrating a processing procedure of a hydraulic vibration detection process performed by the hydraulic control device according to the embodiment. FIG. 7 is a block diagram illustrating a configuration of the vibration control unit according to the embodiment. FIG. 8 is a diagram illustrating a control operation for damping hydraulic vibration as a comparative example. FIG. 9 is a diagram illustrating a control operation for damping hydraulic vibration according to the embodiment. FIG. 10 is a flowchart illustrating a processing procedure of hydraulic control performed by the hydraulic control device according to the embodiment. FIG. 11 is a block diagram illustrating a configuration of a vibration control unit according to the second embodiment. FIG. 12 is a diagram illustrating a control operation for damping hydraulic vibration according to the second embodiment. FIG. 13 is a flowchart illustrating a processing procedure of hydraulic control performed by the hydraulic control device according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts have the same reference characters allotted, and description thereof will not be repeated. The present invention is not limited by the embodiments described below.

  First, a configuration of a main part of a vehicle equipped with the hydraulic control device 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration of a main part of a vehicle equipped with a hydraulic control device 1 according to the embodiment.

  The vehicle includes an engine (not shown) as a drive source. The output of the engine is transmitted to the drive wheels 6 via the transmission 7.

  The transmission 7 has, for example, a belt-type continuously variable transmission mechanism. The transmission 7 includes a primary pulley 3, a secondary pulley 4, a belt 5, and a hydraulic circuit 2. The primary pulley 3 is connected to an engine (not shown), and the secondary pulley 4 is connected to driving wheels 6.

  The belt 5 is wound around the primary pulley 3 and the secondary pulley 4, and transmits the output of the engine to the driving wheels 6.

  Each of the primary pulley 3 and the secondary pulley 4 is provided with a hydraulic cylinder to be controlled (not shown). By adjusting the hydraulic pressure of the working oil supplied from the oil supply 8 to the hydraulic cylinder, the clamping force of the primary pulley 3 and the secondary pulley 4 is adjusted. Thus, the contact radius between the primary pulley 3 and the secondary pulley 4 and the belt 5, that is, the diameter of the belt with respect to each pulley changes. Thereby, the speed ratio of the transmission 7 changes steplessly.

  The hydraulic circuit 2 includes a plurality of oil paths, and a first solenoid valve 21a, a second solenoid valve 21b, a first hydraulic valve 22a, and a second hydraulic valve 22b provided in each oil path.

  The first solenoid valve 21a is provided in an oil passage between the first supply source 8a of the oil supply 8 and the first hydraulic valve 22a (hereinafter, referred to as a "first oil passage 200a"). The first solenoid valve 21a adjusts the opening of the first oil passage 200a by adjusting its own valve opening by its own linear solenoid.

  Specifically, hydraulic oil is supplied from the first supply source 8a of the oil supply 8 to the first oil passage 200a provided with the first solenoid valve 21a. The first solenoid valve 21a adjusts the degree of opening of the first oil passage 200a according to a command current supplied from the hydraulic control device 1 via the signal line 1a. Thereby, the hydraulic pressure of the hydraulic oil supplied from the first supply source 8a is adjusted, the hydraulic oil is supplied to the first hydraulic valve 22a, and the valve opening of the first hydraulic valve 22a is adjusted.

  The first hydraulic valve 22a is a mechanical valve, and is provided in an oil passage between the second supply source 8b of the oil supply 8 and a hydraulic cylinder provided on the primary pulley 3 (hereinafter, referred to as a "second oil passage 200b"). Can be The first hydraulic valve 22a adjusts its own valve opening by the hydraulic pressure of the first oil passage 200a adjusted by the first solenoid valve 21a. As a result, the first hydraulic valve 22a adjusts the hydraulic pressure of the second oil passage 200b, and adjusts the hydraulic pressure supplied to the hydraulic cylinder provided on the primary pulley 3, that is, the clamping force of the primary pulley 3.

  Specifically, hydraulic oil is supplied from the second supply source 8b of the oil supply 8 to the second oil passage 200b provided with the first hydraulic valve 22a. The first hydraulic valve 22a adjusts the opening of the second oil passage 200b according to the hydraulic pressure of the hydraulic oil supplied from the first solenoid valve 21a. Thereby, the hydraulic pressure of the hydraulic oil supplied from the second supply source 8b is adjusted, and the hydraulic oil is supplied to the hydraulic cylinder provided on the primary pulley 3.

  The second solenoid valve 21b is provided on an oil passage between the first supply source 8a of the oil supply 8 and the second hydraulic valve 22b (hereinafter, referred to as a "third oil passage 200c"). The second solenoid valve 21b adjusts the opening of the third oil passage 200c by adjusting its own valve opening by its own linear solenoid.

  Specifically, hydraulic oil is supplied from the first supply source 8a of the oil supply 8 to the third oil passage 200c provided with the second solenoid valve 21b. The second solenoid valve 21b adjusts the degree of opening of the third oil passage 200c according to a command current supplied from the hydraulic control device 1 via the signal line 1b. Thereby, the hydraulic pressure of the hydraulic oil supplied from the first supply source 8a is adjusted, the hydraulic oil is supplied to the second hydraulic valve 22b, and the valve opening of the second hydraulic valve 22b is adjusted.

  The second hydraulic valve 22b is a mechanical valve, and is provided in an oil passage between the second supply source 8b of the oil supply 8 and a hydraulic cylinder provided on the secondary pulley 4 (hereinafter, referred to as a "fourth oil passage 200d"). Can be The second hydraulic valve 22b adjusts the oil pressure of the fourth oil passage 200d by adjusting the valve opening of the second hydraulic valve 22b by the oil pressure of the third oil passage 200c adjusted by the second solenoid valve 21b. The hydraulic pressure supplied to the hydraulic cylinder provided on the secondary pulley 4, that is, the clamping force of the secondary pulley 4 is adjusted.

  Specifically, hydraulic oil is supplied from the second supply source 8b of the oil supply 8 to the fourth oil passage 200d provided with the second hydraulic valve 22b. The second hydraulic valve 22b adjusts the degree of opening of the fourth oil passage 200d according to the hydraulic pressure of the hydraulic oil supplied from the second solenoid valve 21b. Thereby, the hydraulic pressure of the hydraulic oil supplied from the second supply source 8b is adjusted, and the hydraulic oil is supplied to the hydraulic cylinder provided on the secondary pulley 4.

  A first current sensor 9a is provided on the signal line 1a. The first current sensor 9a detects a current flowing through the first solenoid valve 21a, and outputs a detected current value to the hydraulic control device 1. A second current sensor 9b is provided on the signal line 1b. The second current sensor 9b detects a current flowing through the second solenoid valve 21b, and outputs the detected current value to the hydraulic control device 1.

  The first oil pressure sensor 10a is provided in the second oil passage 200b. The first oil pressure sensor 10a detects the oil pressure on the downstream side of the first oil pressure valve 22a, that is, the oil pressure applied to the hydraulic cylinder of the primary pulley 3, and outputs the detected oil pressure value to the oil pressure control device 1.

  The second oil pressure sensor 10b is provided in the fourth oil passage 200d. The second oil pressure sensor 10b detects the oil pressure on the downstream side of the second oil pressure valve 22b, that is, the oil pressure applied to the hydraulic cylinder of the secondary pulley 4, and outputs the detected oil pressure value to the oil pressure control device 1.

  Here, the valves for adjusting the hydraulic pressure supplied to the primary pulley 3 are referred to as “first solenoid valve 21a” and “first hydraulic valve 22a”, respectively. First hydraulic pressure sensor 10a ". The valves for adjusting the hydraulic pressure supplied to the secondary pulley 4 are referred to as “second solenoid valve 21b” and “second hydraulic valve 22b”, respectively, and “second current sensor 9b” “second hydraulic pressure” Although described as "sensor 10b", these will be described as "solenoid valve 21," "hydraulic valve 22," "current sensor 9," and "hydraulic sensor 10" when they are described without distinction.

  In addition, the first hydraulic sensor 10a on the primary pulley 3 side may be omitted if the system controls the clamping pressure of the secondary pulley 4 more strictly than the clamping pressure of the primary pulley 3. As a result, costs can be reduced. In this case, the hydraulic vibration generated in the oil passage on the primary pulley 3 side can be detected from the value of the current flowing through the first solenoid valve 21a, that is, the output of the current sensor 9a. This is because the position of the first solenoid valve 21a itself fluctuates due to the hydraulic vibration, and the fluctuation appears in the current.

  The hydraulic control device 1 controls the first solenoid valve 21a based on outputs from the first current sensor 9a, the first hydraulic sensor 10a, and various sensors indicating an operating state (not shown). Accordingly, the hydraulic control device 1 controls the hydraulic pressure of the hydraulic oil supplied to the primary pulley 3 from the second supply source 8b of the oil supply 8 via the hydraulic circuit 2.

  The hydraulic control device 1 controls the second solenoid valve 21b based on outputs from the second current sensor 9b, the second hydraulic sensor 10b, and various sensors indicating an operating state (not shown). Accordingly, the hydraulic control device 1 controls the hydraulic pressure of the hydraulic oil supplied to the secondary pulley 4 from the second supply source 8b of the oil supply 8 via the hydraulic circuit 2.

  The hydraulic control device 1 detects hydraulic vibration generated in the oil passage 200b downstream of the first hydraulic valve 22a based on the hydraulic pressure measured by the first hydraulic pressure sensor 10a. The hydraulic control device 1 detects a hydraulic vibration generated in the oil passage 200d on the downstream side of the second hydraulic valve 22b based on the hydraulic pressure measured by the second hydraulic sensor 10b. When detecting the hydraulic vibration, the hydraulic control device 1 performs control to suppress the hydraulic vibration, that is, to control the vibration.

<Configuration of hydraulic control device>
Subsequently, the configuration of the hydraulic control device 1 according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the hydraulic control device 1 according to the embodiment. In FIG. 2, components necessary for explaining the features of the embodiment are represented by functional blocks, and descriptions of general components are omitted.

  In other words, each component illustrated in FIG. 2 is a functional concept and does not necessarily need to be physically configured as illustrated. For example, the specific form of distribution / integration of each functional block is not limited to the illustrated one, and all or a part thereof may be functionally or physically distributed in arbitrary units according to various loads and usage conditions. -It is possible to integrate and configure.

  As shown in FIG. 2, the hydraulic control device 1 includes a control unit 11 and a storage unit 12.

  The control unit 11 is realized by, for example, a processor. Examples of the processor include a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field Programmable Gate Array).

  The control unit 11 realizes functions of each unit described below by executing a program stored in a ROM (Read Only Memory) not shown.

  The control unit 11 includes an input unit 110, a solenoid control unit 120, a solenoid drive unit 130, a vibration detection unit 140, a vibration detection control unit 150, and a vibration control unit 160.

  The input unit 110 acquires various sensor information, and includes a hydraulic pressure detection unit 111 and a current detection unit 112. The sensor information detected by the input unit 110 is output to the solenoid control unit 120, the vibration detection unit 140, the vibration detection control unit 150, the vibration control unit 160, and the like. The input unit 110 includes an AD converter (not shown), and performs AD conversion on the outputs of various sensors at predetermined intervals (for example, every 4 ms) and outputs the converted information as sensor information.

The oil pressure detection unit 111 detects the oil pressure on the downstream side of the first oil pressure valve 22a output from the first oil pressure sensor 10a. Further, the oil pressure detecting unit 111 detects the oil pressure on the downstream side of the second oil pressure valve 22b output from the second oil pressure sensor 10b.
The current detection unit 112 is configured to output the first solenoid valve 21a output from the first current sensor 9a.
Detects the current flowing through Further, the current detection unit 112 detects a current flowing from the second current sensor 9b and flowing through the second solenoid valve 21b.
The input unit 110 also detects other sensor information such as the number of revolutions of the primary pulley 3 necessary for hydraulic control and outputs the information to each unit, but is not shown.

  The solenoid control unit 120 determines a target opening of the solenoid valve 21. The solenoid control unit 120 controls the solenoid valve 21 by generating a target drive current for a linear solenoid (not shown) provided in the solenoid valve 21. The solenoid control unit 120 includes a target oil pressure derivation unit 121, an opening degree determination unit 122, a first signal generation unit 123, and a second signal generation unit 124.

  The target hydraulic pressure deriving unit 121 calculates a target gear ratio of the transmission 7 based on the operation state based on the sensor information detected by the input unit 110, and controls the primary pulley 3 necessary for controlling the transmission 7 to the target gear ratio. And the target hydraulic pressure for the secondary pulley 4 is derived.

  The opening determiner 122 determines the target opening of the hydraulic valve 22 according to the target oil pressure for each of the pulleys 3 and 4, and sets the first and second opening degrees of the hydraulic valve 22 to the target opening. The target opening of the solenoid valves 21a and 21b is determined. In the following description, the “target opening” refers to the target opening of the solenoid valve 21. The target opening is determined based on the target oil pressure by a map or a function that determines the relationship between the target oil pressure and the target opening.

  The first signal generator 123 generates a first target drive current that is a target control signal for the linear solenoid according to the target opening of the first solenoid valve 21a determined by the opening determiner 122. The first signal generation unit 123 outputs the generated first target drive current to the solenoid drive unit 130.

  The second signal generator 124 generates a second target drive current, which is a target control signal for the linear solenoid, according to the target opening of the second solenoid valve 21b determined by the opening determiner 122. The second signal generator 124 outputs the generated second target drive current to the solenoid driver 130.

  The solenoid drive unit 130 generates first and second drive currents for driving the linear solenoids of the solenoid valve 21 as instruction currents based on the first and second target drive currents generated by the solenoid control unit 120, respectively. The solenoid drive unit 130 includes a first drive unit 131 and a second drive unit 132.

  The first drive section 131 generates a first drive current for driving the first solenoid valve 21a as a first instruction current based on the first target drive current generated by the first signal generation section 123. Specifically, the first drive section 131 performs current feedback control such that the current flowing through the first solenoid valve 21a detected by the current detection section 112 becomes the first target drive current.

  The second drive unit 132 generates a second drive current for driving the second solenoid valve 21b as a second instruction current in the same manner as the first drive unit 131.

  Vibration detecting section 140 detects that hydraulic vibration has occurred in hydraulic circuit 2, and outputs a determination result to vibration control section 160. Specifically, the vibration detection unit 140 determines whether or not vibration has occurred in the hydraulic pressure on the downstream side of the hydraulic valve 22 detected by the hydraulic pressure detection unit 111 based on the output of the hydraulic pressure sensor 10. That is, the vibration detection unit 140 determines whether or not vibration has occurred in the hydraulic pressure applied to at least one of the hydraulic cylinders of the primary pulley 3 and the secondary pulley 4. The vibration detection unit 140 includes an amplitude detection unit 141, a period measurement unit 142, and a vibration determination unit 143.

  The amplitude detecting unit 141 detects whether or not vibration of a hydraulic pressure having an amplitude equal to or greater than a predetermined amplitude value has occurred based on the hydraulic pressure detected by the hydraulic pressure detecting unit 111 (hereinafter, referred to as “detected hydraulic pressure”). Specifically, the amplitude detection unit 141 measures the amplitude of the oscillating oil pressure for each cycle of the oscillating oil pressure (hereinafter, referred to as “oscillation oil pressure”) and compares the amplitude with a predetermined amplitude threshold value B. More specifically, the amplitude detection unit 141 measures the maximum value and the minimum value of the detected hydraulic pressure for each cycle of the vibration hydraulic pressure. The amplitude detector 141 sets a value obtained by subtracting the target oil pressure from the maximum value as the pressure increase amplitude SU, and sets a value obtained by subtracting the minimum value from the target oil pressure as the pressure decrease amplitude SD. The amplitude detecting section 141 compares the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD with a predetermined amplitude threshold value B, respectively. When the condition that both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD are equal to or greater than the amplitude threshold value B is satisfied, the amplitude detection unit 141 detects occurrence of hydraulic pressure oscillation having an amplitude equal to or greater than a predetermined amplitude value.

  The method of measuring the amplitude of the vibration oil pressure is not limited to the above. For example, a value obtained by subtracting a value obtained by subtracting the minimum value from the maximum value of the detected oil pressure in one cycle of the vibration oil pressure by 2 may be used as the amplitude. In this case, the comparison between the amplitude and the amplitude threshold value B only needs to be performed once.

  The period measuring unit 142 measures a period during which the vibration of the hydraulic pressure having the amplitude equal to or larger than the predetermined amplitude value detected by the amplitude detecting unit 141 continues. Specifically, the period measurement unit 142 measures the number of vibrations of the hydraulic pressure having the amplitude equal to or larger than the predetermined amplitude value. More specifically, the period measurement unit 142 has a period measurement counter C, and counts up by one each time the amplitude detection unit 141 detects a hydraulic oscillation having an amplitude equal to or greater than a predetermined amplitude value.

  The period measuring unit 142 resets the period measuring counter C when the amplitude detecting unit 141 does not detect the vibration of the hydraulic pressure having the amplitude equal to or more than the predetermined amplitude value in one cycle of the vibration hydraulic pressure. Therefore, the value of the period measurement counter C indicates the number of times that the vibration of the hydraulic pressure having the amplitude equal to or larger than the predetermined amplitude value occurs continuously. Accordingly, it is possible to accurately detect that the vibration of the hydraulic pressure having the amplitude equal to or larger than the predetermined amplitude value is continuously generated.

  When the condition is not satisfied in one cycle of the vibration oil pressure, the period measurement counter C may not be reset immediately, but may be reset, for example, when the condition is not satisfied twice consecutively. As a result, it is possible to prevent the condition from being satisfied by the influence of disturbance such as noise, resetting the period measurement counter C, and delaying the detection of the hydraulic vibration.

  The vibration determination unit 143 determines that hydraulic vibration has occurred based on the output of the period measurement unit 142. Specifically, the vibration determination unit 143 compares the value of the period measurement counter C of the period measurement unit 142 with a predetermined period threshold C1, and determines that hydraulic vibration has occurred when the value of the period measurement counter C has become equal to or greater than the period threshold C1. judge. The period threshold C1 is, for example, 10. That is, when the vibration of the hydraulic pressure having the amplitude equal to or more than the predetermined amplitude value is continuously performed ten times, it is determined that the hydraulic vibration has occurred. When determining that hydraulic vibration has occurred, the vibration determination unit 143 notifies the vibration control unit 160 of the determination result.

  The vibration detection control unit 150 controls a detection operation of the vibration detection unit 140. The vibration detection control unit 150 includes a frequency information detection unit 151, a change unit 152, a sudden change detection unit 153, and a stop unit 154.

  The frequency information detector 151 detects vibration frequency information of the hydraulic pressure based on the detected hydraulic pressure. Specifically, the frequency information detection unit 151 detects the vibration frequency of the hydraulic pressure based on the detected hydraulic pressure. More specifically, the frequency information detection unit 151 detects the hydraulic pressure phase by detecting the hydraulic pressure phase by detecting the vibration frequency. In another example, the frequency information detection unit 151 can detect the vibration frequency of the hydraulic pressure from the amount of change in the hydraulic pressure near the target hydraulic pressure. When the vibration frequency of the hydraulic pressure is high, the change amount of the hydraulic pressure near the target hydraulic pressure is large, and when the vibration frequency is low, the change amount of the hydraulic pressure near the target hydraulic pressure is small. The level of the frequency can be determined.

  The changing unit 152 changes the period threshold value C1 according to the vibration frequency information of the hydraulic pressure detected by the frequency information detecting unit 151. Specifically, when the vibration frequency of the hydraulic pressure is a low frequency equal to or lower than the predetermined frequency, the changing unit 152 lowers the period threshold to C2, which is a value smaller than C1, for example, 6. Thus, even when low-frequency hydraulic vibration occurs, the hydraulic vibration can be detected quickly.

  The sudden change detection unit 153 detects a sudden change state in which the change rate per unit time of the target hydraulic pressure-related information related to the target hydraulic pressure is equal to or more than a predetermined value. The target hydraulic pressure related information is information having a high correlation with the target hydraulic pressure. Specifically, the target oil pressure related information is detected by the target oil pressure derived by the target oil pressure derivation unit 121, the target drive current generated by the first signal generation unit 123 and the second signal generation unit 124, and detected by the current detection unit 112. The current flowing through the solenoid valve 21. In the present embodiment, a description will be given below using a target hydraulic pressure as an example of target hydraulic pressure-related information.

  Specifically, the sudden change detection unit 153 detects that the target oil pressure has suddenly changed when the target oil pressure derived by the target oil pressure derivation unit 121 has changed by a predetermined value or more. More specifically, when the difference between the target hydraulic pressures derived by the target hydraulic pressure deriving unit 121 at the previous and current calculation timings is equal to or greater than a predetermined value, the sudden change detection unit 153 detects that the target hydraulic pressure has suddenly changed. Such a predetermined value is a fluctuation range of the target hydraulic pressure in which hydraulic vibration may occur, and is obtained in advance by experiment or adaptation.

  When the sudden change detecting unit 153 detects a sudden change in the target hydraulic pressure, the stopping unit 154 stops the detection of the hydraulic vibration by the vibration detecting unit 140 for a predetermined period. Specifically, when a sudden change in the target oil pressure is detected, the stop unit 154 stops the operation of the entire vibration detection unit 140. The stop unit 154 may stop the operation of at least one of the amplitude detection unit 141, the period measurement unit 142, and the vibration determination unit 143 when a sudden change in the target oil pressure is detected. When the target oil pressure changes suddenly, the oil pressure may converge to the target oil pressure while vibrating due to the influence. The hydraulic vibration in this case is not the hydraulic vibration to be damped. Therefore, when the sudden change in the target hydraulic pressure is detected, the detection of the hydraulic vibration is stopped for a predetermined period, so that it is possible to prevent the vibration detecting unit 140 from erroneously determining the hydraulic vibration generated due to the sudden change in the target hydraulic pressure as the hydraulic vibration.

  The vibration control unit 160 receives the notification from the vibration detection unit 140 that hydraulic vibration has occurred, and performs vibration suppression control to suppress hydraulic vibration, that is, to suppress vibration. Details of the vibration control unit 160 will be described later.

  The storage unit 12 is configured by a flash ROM or a random access memory (RAM), and stores the various thresholds and predetermined values as threshold information 13 in the flash ROM. The control unit 11 reads the threshold information 13 as appropriate, uses it for controlling each unit, and performs an operation while temporarily storing various data in the RAM.

<Hydraulic vibration detection operation>
Subsequently, the detection operation of the hydraulic vibration performed by the hydraulic control device according to the embodiment will be specifically described.

  FIG. 3 is a diagram illustrating an operation of detecting a relatively high-frequency hydraulic vibration in which the vibration frequency of the hydraulic pressure is equal to or higher than a predetermined frequency (hereinafter, referred to as “high-frequency hydraulic vibration”). FIG. 4 is a diagram illustrating an operation of detecting a low-frequency hydraulic vibration in which the vibration frequency of the hydraulic pressure is equal to or lower than a predetermined frequency (hereinafter, referred to as “low-frequency hydraulic vibration”). 3 and 4, (a) is a diagram showing a state of a target oil pressure of the secondary pulley 4 and an actual oil pressure downstream of the second hydraulic valve 22b. (B) is a figure which shows the determination state of the vibration frequency of a hydraulic pressure. (C) is a figure which shows the state of the period measurement counter C for measuring the duration of the vibration of hydraulic pressure. (D) is a diagram illustrating a state of a determination flag indicating a detection state of hydraulic vibration.

  First, a case where high-frequency hydraulic vibration occurs will be described with reference to FIG.

  FIG. 3A shows that the target hydraulic pressure changes from YO1 to YO2 at time t0, and accordingly, hydraulic vibration occurs after time t0.

  The amplitude detection unit 141 measures the maximum value and the minimum value of the detected hydraulic pressure at each cycle (indicated by T in FIG. 3A) of the vibration cycle of the detected hydraulic pressure detected based on the second hydraulic pressure sensor 10b. , The pressure-increase-side amplitude SU and the pressure-decrease-side amplitude SD are calculated by subtraction from the target oil pressure YO2. The amplitude detection unit 141 detects that both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD have become equal to or larger than the amplitude threshold B during one period from time t1 to t2. That is, the amplitude detector 141 detects that hydraulic vibration having an amplitude exceeding the amplitude threshold B has occurred. As a result, as shown in FIG. 3C, the period measuring unit 142 increments the period measuring counter C by one at time t2 when one period of the vibration period ends. That is, the period measuring unit 142 measures that one hydraulic oscillation having an amplitude equal to or greater than the predetermined amplitude value has occurred.

  The amplitude detector 141 similarly detects that both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD have become equal to or larger than the amplitude threshold B in the period T of each vibration cycle after time t2. Therefore, the period measuring unit 142 increments the value of the period measurement counter C by one at times t3, t4,. When the amplitude detecting unit 141 detects that at least one of the pressure-increasing amplitude SU and the pressure-decreasing-side amplitude SD is not greater than or equal to the amplitude threshold B in one cycle of the oscillation cycle, the period measuring unit 142 determines whether or not the cycle ends. Resets the period measurement counter C.

  On the other hand, the frequency information detection unit 151 detects the vibration frequency from one cycle of the vibration oil pressure starting from the time t1 when the detected oil pressure first crosses the target oil pressure YO2, that is, t2-t1. In the case of the example shown in FIG. 3, since the vibration cycle is equal to or less than the predetermined cycle, that is, equal to or more than the predetermined frequency, the frequency information detection unit 151 determines that the vibration frequency is high at time t2. Accordingly, the changing unit 152 sets the period threshold value, which is the determination threshold value of the hydraulic vibration, to the initial value C1 (for example, 10).

  The vibration determination unit 143 periodically compares the value of the period measurement counter C with the period threshold C1. When the value of the period measurement counter C reaches C1 at time t11, the vibration determination unit 143 determines that hydraulic vibration has occurred, and sets a determination flag. The vibration determination unit 143 periodically notifies the vibration control unit 160 of the information of the determination flag, and notifies the vibration control unit 160 that the hydraulic vibration has occurred at time t11.

  Subsequently, a case where low-frequency hydraulic vibration has occurred will be described with reference to FIG.

  An operation in which the amplitude detection unit 141 compares the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD with the amplitude threshold value B (FIG. 4A), and an operation in which the period measurement unit 142 counts up the period measurement counter C (FIG. Since c)) is the same as FIG. 3, the description is omitted here.

  The frequency information detection unit 151 detects the vibration frequency from one cycle of the vibration oil pressure starting from time t21 when the detected oil pressure first crosses the target oil pressure YO2, that is, t22-t21. In the case of the example shown in FIG. 4, since the vibration cycle is equal to or longer than the predetermined cycle, that is, the frequency is equal to or lower than the predetermined frequency, the frequency information detection unit 151 determines that the frequency is low at time t22. Accordingly, the changing unit 152 sets the period threshold value, which is the determination threshold value of the hydraulic vibration, to C2 (for example, 6), which is a value smaller than the initial value C1.

  When the value of the period measurement counter C reaches C2 at time t27, the vibration determination unit 143 determines that hydraulic vibration has occurred, and sets a determination flag. The vibration determination unit 143 notifies the vibration control unit 160 that the hydraulic vibration has occurred at time t27.

  If the period threshold value remains at C1 (10) despite the occurrence of the low-frequency hydraulic vibration, the hydraulic vibration is detected 10T after the hydraulic vibration has occurred. Accordingly, during this time, the influence on the secondary pulley 4 increases, such as an increase in the possibility that the clamping pressure of the secondary pulley 4 decreases due to the hydraulic vibration. On the other hand, according to the hydraulic control device of the embodiment, when low-frequency hydraulic vibration occurs, the period threshold value decreases from C1 to C2. Is detected. Therefore, the influence on the secondary pulley 4 can be reduced.

<Other examples of detection of vibration frequency>
In the present embodiment, the frequency information detection unit 151 detects the vibration frequency from the cycle of the vibration oil pressure. As another example of detecting the vibration frequency, the vibration frequency can be detected from the amount of change in the detected oil pressure. Hereinafter, other detection examples of the vibration frequency will be described.

  When hydraulic vibration is occurring, the hydraulic pressure fluctuates in a sinusoidal manner around the target hydraulic pressure. Therefore, the amount of change in the detected hydraulic pressure during the vibration of the hydraulic pressure is greatest when the hydraulic pressure passes the target hydraulic pressure. The amount of change increases as the vibration frequency increases. In other words, the vibration frequency of the hydraulic pressure corresponds one-to-one with the amount of change in the hydraulic pressure.

  Based on this fact, the frequency information detection unit 151 detects a change in the oil pressure near the target oil pressure where the change in the oil pressure is the largest, and detects the vibration frequency of the oil pressure from the change. Describing with reference to FIG. 3, the frequency information detection unit 151 calculates the amount of change in the detected oil pressure at time t2 when the detected oil pressure crosses the target oil pressure YO2. Specifically, at time t2 when the detected oil pressure becomes equal to or higher than the target oil pressure YO2, the frequency information detection unit 151 determines the amount of change in oil pressure from the detected oil pressure detected at time t2 and the detected oil pressure detected immediately before by the AD conversion. Is calculated. The frequency information detection unit 151 detects the vibration frequency based on the calculated change amount of the hydraulic pressure based on a map (not shown) stored in the storage unit 12 in advance. In the example shown in FIG. 3A, the amount of change in the detected oil pressure at time t2 is equal to or greater than a predetermined value corresponding to a high frequency, and therefore, the frequency information detection unit 151 determines that the vibration frequency is high at time t2. On the other hand, in the example shown in FIG. 4A, the amount of change in the detected oil pressure at the time t22 is equal to or less than a predetermined value corresponding to the high frequency, so that the frequency information detection unit 151 determines that the vibration frequency is low at the time t22.

  The specific example of detecting the vibration frequency of the hydraulic pressure based on the amount of change in the hydraulic pressure is not limited to the above. For example, the change amount may be obtained from the oil pressure at the time when the detected oil pressure becomes equal to or higher than the target oil pressure YO2 and the oil pressure after a predetermined time. In this case, the predetermined time is a time before the hydraulic pressure reaches the peak with respect to the assumed highest vibration frequency of the hydraulic pressure.

  The timing at which the frequency information detection unit 151 calculates the amount of change in the detected hydraulic pressure is not limited to time t2 or time t22. The frequency information detection unit 151 may calculate the timing at which the period threshold switches from C1 (10) to C2 (6), that is, before the end of six cycles of the vibration oil pressure. In the example of FIG. 4, the frequency information detection unit 151 may calculate the amount of change in the detected oil pressure at any one of the times t22 to t26 and detect the frequency.

  As described above, the hydraulic vibration detection operation has been described in the case where hydraulic vibration occurs in the fourth oil passage 200d connected to the secondary pulley 4, but hydraulic vibration occurs in the second oil passage 200b connected to the primary pulley 3. In this case, hydraulic vibration is detected in the same manner.

<Operation of sudden change detection section 153 and stop section 154>
Next, operations performed by the sudden change detection unit 153 and the stop unit 154 illustrated in FIG. 2 will be specifically described.

  FIG. 5 is a diagram showing an operation of detecting hydraulic vibration when the target hydraulic pressure changes suddenly.

  FIG. 5A shows a command current output from the first drive unit 131 to the second solenoid valve 21b in order to control the hydraulic pressure to the secondary pulley 4. FIG. 5B is a diagram showing the state of the target hydraulic pressure and the actual hydraulic pressure downstream of the second hydraulic valve 22b. FIG. 5C is a diagram showing a state of the period measurement counter C for measuring the duration of the hydraulic vibration.

  As shown in FIG. 5B, it is assumed that the target oil pressure repeatedly changes rapidly from YO1 to YO2 from time t30 to t31. As a result, the command current output from the second drive unit 132 also sharply decreases from time t30 to time t31 as shown in FIG. The actual oil pressure converges to the target oil pressure YO2 while repeatedly increasing and decreasing rapidly from time t30 to time t31 as shown in FIG. 5B according to the command current. FIG. 5B shows a state in which the hydraulic pressure has stabilized after the time t31 at the target hydraulic pressure YO2, and then the hydraulic vibration has occurred.

  The sudden change detection unit 153 detects that the target oil pressure has suddenly changed at time t30, and notifies the stopping unit 154 that the target oil pressure has suddenly changed. Upon receiving the notification, the stopping unit 154 stops the operation of detecting the hydraulic vibration of the vibration detecting unit 140 for a predetermined time T1 from that time.

  The sudden change detection unit 153 notifies the stop unit 154 of a sudden change in the target oil pressure every time a sudden change in the target oil pressure is detected during the period from time t30 to time t31. The stopping unit 154 stops the operation of detecting the hydraulic vibration of the vibration detecting unit 140 for a predetermined time T1 as shown in FIG. Therefore, the vibration detecting unit 140 stops detecting the hydraulic vibration from time t30 when the sudden change in the target oil pressure is first detected to time t32 when the sudden change in the target oil pressure is finally detected and the predetermined time T1 elapses, and the time t32 The detection operation is restarted. Thereby, as shown in FIG. 5C, the period measuring unit 142 detects the first hydraulic oscillation having the amplitude equal to or more than the first predetermined amplitude value at the time t33.

  As described above, the sudden change detection unit 153 and the stop unit 154 cause the vibration determination unit 143 to generate the vibration of the hydraulic pressure caused by the sudden change of the target hydraulic pressure, that is, from the time t30 to the time t32 shown in FIG. It is possible to prevent erroneous determination of vibration as hydraulic vibration and notification to the vibration control unit 160.

<Hydraulic vibration detection processing>
Next, a processing procedure of a hydraulic vibration detection process executed by the hydraulic control device 1 according to the embodiment will be described with reference to FIG. FIG. 6 is a flowchart illustrating a processing procedure of a hydraulic vibration detection process performed by the hydraulic control device 1 according to the embodiment. The hydraulic control device 1 repeatedly executes the control processing shown in FIG. 6 when the power is supplied by turning on an ignition switch (not shown).

  First, the hydraulic pressure detection unit 111 detects the hydraulic pressure on the downstream side of the hydraulic valve 22 based on the hydraulic pressure sensor 10 (Step S1). Next, the sudden change detection unit 153 detects the target hydraulic pressure derived by the target hydraulic pressure derivation unit 121 (Step S2). The sudden change detection unit 153 determines whether or not the target oil pressure has suddenly changed based on the difference between the previously detected target oil pressure and the currently detected target oil pressure (step S3).

  If the target hydraulic pressure is not in the sudden change state (NO in step S3), the process proceeds to step S5. When the target oil pressure suddenly changes (YES in step S3), the stop unit 154 sets a stop time timer (not shown) to T1 in order to stop the detection of the hydraulic vibration by the vibration detection unit 140 for a certain period of time (step S4). ), And proceed to step S5. Note that the stop time timer is decremented by a subroutine (not shown), and when the timer value becomes 0, the timer holds 0.

  Next, the stopping unit 154 determines whether the operation of detecting the hydraulic vibration is being stopped (Step S5). That is, the stop unit 154 determines whether or not the stop time timer is greater than zero. When the detection operation of the hydraulic vibration is stopped, that is, when the stop time timer is larger than 0 (step S5: YES), the stop unit 154 ends the process. Accordingly, the stop unit 154 stops the process of detecting the hydraulic vibration from step S6 onward by the vibration detection unit 140.

  On the other hand, when the detection operation of the hydraulic vibration is not stopped, that is, when the stop time timer is 0 (NO in step S5), the vibration detecting unit 140 executes the processing of detecting the hydraulic vibration in step S6 and subsequent steps.

  The amplitude detector 141 measures the amplitude of the hydraulic vibration (Step S6). That is, the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD are measured based on the maximum value and the minimum value of the detected hydraulic pressure in one cycle of the vibration hydraulic pressure and the target hydraulic pressure.

  The frequency information detector 151 detects the vibration frequency (Step S7). Specifically, the frequency information detection unit 151 detects a period of the vibration oil pressure or a change amount of the vibration oil pressure near the target oil pressure.

  At the end of one cycle of the oscillating hydraulic pressure, the amplitude detector 141 determines whether both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD measured in Step S6 are equal to or larger than the amplitude threshold B (Step S8). If the determination in step S8 is negative (step S8 NO), the period measurement unit 142 clears the period measurement counter C. The vibration determination unit 143 determines that no hydraulic vibration has occurred, and ends the processing.

  If both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD are equal to or larger than the amplitude threshold value B (step S8: YES), the period measurement unit 142 counts up the period measurement counter C by one (step S10). The changing unit 152 determines whether the vibration frequency detected in step S7 is a low frequency lower than the predetermined frequency (step S11). Specifically, the changing unit 152 determines that the frequency is low if the cycle of the vibration oil pressure detected in step S7 is equal to or longer than a predetermined cycle. Further, when the change amount of the vibration oil pressure near the target oil pressure is equal to or less than a predetermined value, the changing unit 152 determines that the frequency is low.

  When the vibration frequency is not the low frequency (step S11 NO), the changing unit 152 sets the period threshold to C1, for example, 10 (step S12). If the vibration frequency is low (step S11: YES), the changing unit 152 sets the period threshold to C2, for example, 6 (step S13).

  The vibration determination unit 143 compares the value of the period measurement counter C with the period threshold set in step S12 or S13, and determines whether the value of the period measurement counter C is equal to or greater than the period threshold (step S14). If the determination in step S14 is negative (NO in step S14), the vibration determination unit 143 determines that no hydraulic vibration has occurred and ends the process. If the value of the period measurement counter C is equal to or greater than the period threshold (YES in step S14), the vibration determination unit 143 determines that hydraulic vibration has occurred (step S15), and notifies the determination result to the vibration control unit 160 (step S15). S16).

  As described above in detail, the hydraulic control device 1 according to the embodiment controls the hydraulic pressure of the hydraulic circuit 2 to the target hydraulic pressure. The hydraulic control device 1 includes a hydraulic pressure detection unit 111 that detects a hydraulic pressure of the hydraulic circuit 2, and a hydraulic pressure having an amplitude equal to or greater than a predetermined amplitude value B based on a hydraulic pressure detected by the hydraulic pressure detection unit 111. When the above is continued, a vibration detecting unit 140 that detects that hydraulic vibration is occurring, a frequency information detecting unit 151 that detects vibration frequency information of the hydraulic pressure based on the hydraulic pressure detected by the hydraulic pressure detecting unit 111, And a changing unit 152 for changing the predetermined period threshold value accordingly.

  Thus, even if the frequency of the hydraulic vibration is low, the hydraulic vibration can be detected early.

  In the hydraulic control device 1 according to the embodiment, the frequency information detection unit 151 detects the vibration frequency of the hydraulic pressure as the vibration frequency information, and the change unit 152 lowers the threshold for a predetermined period when the vibration frequency is equal to or lower than the predetermined frequency. Let it.

  Thus, even if the frequency of the hydraulic vibration is low, the hydraulic vibration can be detected early.

  Further, in the hydraulic control device 1 according to the embodiment, the frequency information detection unit 151 detects a vibration cycle of the hydraulic pressure as the vibration frequency information, and the change unit 152 sets the threshold for a predetermined period when the vibration cycle is equal to or longer than the predetermined cycle. Lower.

  Thus, the frequency of the hydraulic vibration can be easily detected, and even if the frequency of the hydraulic vibration is low, the hydraulic vibration can be detected early.

  Further, in the hydraulic control device 1 according to the embodiment, the frequency information detection unit 151 detects the change amount of the oil pressure near the target oil pressure as the vibration frequency information, and the change unit 152 performs the operation when the change amount of the oil pressure is equal to or less than the predetermined value. , Lower the threshold for a predetermined period.

  Thus, the frequency of the hydraulic vibration can be detected by a different method, and even if the frequency of the hydraulic vibration is low, the hydraulic vibration can be detected early.

  In addition, the hydraulic control device 1 according to the embodiment includes a sudden change detecting unit 153 that detects a sudden change state in which a change rate of target oil pressure related information related to a target oil pressure is equal to or more than a predetermined value, and a hydraulic oscillation when a sudden change state is detected. And a stopping unit for stopping the detection of a predetermined period.

  Thus, it is possible to prevent the vibration of the hydraulic pressure generated due to the sudden change of the target hydraulic pressure from being erroneously determined as the hydraulic vibration.

  Further, the hydraulic control device 1 according to the embodiment further includes a vibration control unit 160 that performs control to suppress the hydraulic vibration when the vibration detection unit 140 detects the occurrence of the hydraulic vibration.

  Thereby, even if hydraulic vibration occurs, hydraulic vibration can be suppressed.

<Modification 1>
In the above embodiment, when both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD of the vibration hydraulic pressure are equal to or greater than the amplitude threshold B, the amplitude detection unit 141 determines that the vibration is the hydraulic pressure having the amplitude equal to or greater than the predetermined amplitude value. It is determined that the period measurement unit 142 has counted up the period measurement counter C. In the first modification, when one of the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD is equal to or larger than the amplitude threshold B in one cycle of the vibration oil pressure, the amplitude detector 141 detects the hydraulic pressure having the amplitude equal to or larger than the predetermined amplitude value. It may be determined that the vibration occurs, and the period measurement unit 142 may count up the period measurement counter C.

  Thereby, even when one of the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD exceeds the amplitude threshold value B and the other hydraulic pressure vibration does not exceed the amplitude threshold value B, the period measurement counter C can be counted up. Hydraulic vibration can be detected early.

<Modification 2>
In the second modification, a period measurement counter CU for the pressure-increase side amplitude and a period measurement counter CD for the pressure-decrease side amplitude are provided, and the period measurement unit 142 individually counts up the counters. Specifically, the amplitude detection unit 141 compares the pressure-increase-side amplitude SU in one cycle of the vibration oil pressure with the amplitude threshold value B. The period measuring unit 142 counts up the period measurement counter CU for the pressure-increasing-side amplitude if the pressure-increasing-side amplitude SU is equal to or larger than the amplitude threshold B, and clears the counter CU if the value is equal to or less than the threshold value B. Further, the amplitude detection unit 141 compares the pressure reduction side amplitude SD in one cycle of the vibration oil pressure with the amplitude threshold value B. The period measurement unit 142 counts up the period measurement counter CD for the reduced pressure side amplitude if the reduced pressure side amplitude SD is equal to or larger than the amplitude threshold value B, and clears the counter CD if it is equal to or smaller than the threshold value B. The vibration determination unit 143 determines that hydraulic vibration has occurred when one of the period measurement counter CU and the period measurement counter CD becomes equal to or greater than the period threshold C1 or C2.

  According to this, the vibration determination unit 143 determines that hydraulic vibration has occurred when at least one of the pressure-increasing-side amplitude SU or the pressure-reducing-side amplitude SD continues for the period threshold C1 or C2 or more. Occurrence can be detected.

<Configuration of vibration control unit>
Subsequently, the configuration of the vibration control unit 160 shown in FIG. 2 will be described.

  FIG. 7 is a block diagram illustrating a configuration of the vibration control unit 160 according to the embodiment. Upon receiving the notification of the occurrence of the hydraulic vibration from the vibration detecting unit 140, the vibration control unit 160 generates and outputs a vibration suppression signal for giving a hydraulic pressure that suppresses the hydraulic vibration. That is, the vibration control unit 160 performs vibration suppression control for suppressing hydraulic vibration. The vibration control section 160 includes an anti-phase signal generation section 161, a signal cut section 162, an end determination section 163, and a vibration suppression signal output section 164.

  The anti-phase signal generation unit 161 generates an anti-phase signal that gives a hydraulic pressure that is opposite to the phase of the hydraulic vibration based on the detected vibration characteristic information of the hydraulic vibration as a vibration suppression signal. Specifically, the anti-phase signal generation unit 161 obtains the amplitude information of the hydraulic vibration from the amplitude detection unit 141 and obtains the vibration frequency and the vibration phase information from the frequency information detection unit 151 as the vibration characteristic information of the hydraulic vibration. . The anti-phase signal generation section 161 generates an anti-phase signal for giving a hydraulic pressure having an anti-phase to the hydraulic vibration based on the vibration characteristic information of the hydraulic vibration. More specifically, upon receiving the notification of the occurrence of the hydraulic vibration from the vibration detecting unit 140, the anti-phase signal generating unit 161 calculates the anti-phase signal from the amplitude, frequency, and phase in the immediately preceding hydraulic vibration cycle, Then, a sine wave signal for giving the hydraulic pressure is generated. Note that the greater the amplitude of the hydraulic vibration, the greater the pressure needs to be reduced. Therefore, the amplitude of the sine wave signal is determined to increase as the amplitude of the hydraulic vibration increases.

  The signal cut unit 162 reduces a signal component of the vibration suppression signal generated by the antiphase signal generation unit 161 that acts in the direction of reducing the oil pressure. Specifically, the signal cut unit 162 cuts a part of the anti-phase signal that controls the oil pressure to a reduced pressure side. Note that the signal cut unit 162 does not completely cut the part for controlling the oil pressure to the pressure reducing side, but controls the oil pressure to the pressure reducing side in response to the sine wave-shaped anti-phase signal generated by the anti-phase signal generating unit 161. What is necessary is just to make the amplitude of the signal component to be small.

  After starting the vibration suppression control, the end determination unit 163 determines the end time of the vibration suppression control, and ends the vibration suppression control. Specifically, the end determination unit 163 determines whether or not the end condition of the vibration suppression control is satisfied based on the amplitude information of the hydraulic vibration obtained from the amplitude detection unit 141 after starting the vibration suppression control, that is, whether the hydraulic vibration is It is determined whether or not it is settled. The condition for terminating the vibration suppression control is that both the pressure-increase-side amplitude SU and the pressure-decrease-side amplitude SD of the hydraulic vibration have become equal to or less than a threshold value B1 indicating that the hydraulic vibration has stopped. Alternatively, the end condition of the vibration suppression control may be that one of the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD becomes equal to or less than the threshold value B1. The end determination unit 163 compares the amplitude of the hydraulic vibration with the threshold value B1, and ends the vibration suppression control when determining that the end condition is satisfied.

  When the damping control is started, the damping signal output unit 164 outputs the opposite phase signal cut by the signal cutting unit 162 to the solenoid driving unit 130 (FIG. 2), and the target output from the solenoid control unit 120 is output. Superimposed on drive current. The vibration suppression signal output unit 164 continuously outputs the cut opposite phase signal until the end determination unit 163 determines that the vibration suppression control is to be ended.

<Damping operation>
Subsequently, the operation of the vibration suppression control performed by the vibration control unit 160 will be described. First, a case where the vibration control unit 160 does not include the signal cut unit 162 will be described with reference to FIG. FIG. 8 is a diagram illustrating a control operation for damping hydraulic vibration as a comparative example.

  As shown in FIG. 8B, the vibration control unit 160 starts the vibration suppression control when receiving the notification that the hydraulic vibration has been detected from the vibration detection unit 140 at time t40. The anti-phase signal generation unit 161 generates an anti-phase signal that gives an oil pressure having an anti-phase to the amplitude, frequency, and phase of the vibration cycle T10 immediately before receiving the notification. The vibration suppression signal output unit 164 repeatedly outputs an anti-phase signal to the solenoid drive unit 130 after time t40. The solenoid drive unit 130 superimposes an anti-phase signal on the target drive current output from the solenoid control unit 120 and outputs it to the solenoid valve 21 as a command current as shown in FIG. In the example of FIG. 8, in the vibration cycle T10 immediately before the hydraulic vibration is detected, the pressure is increased in the first half cycle and reduced in the second half cycle. Therefore, the antiphase signal is a signal in which the first half cycle is depressurized and the second half cycle is depressurized. By outputting the command current to the solenoid valve 21 at the time t40, as shown in FIG. 8B, the increase in the hydraulic pressure is suppressed during the half cycle T11 on the pressure-reducing side of the command current, and the hydraulic vibration is reduced. The amplitude decreases. During the subsequent half cycle T12 on the pressure-increasing side of the instruction current, the decrease in the hydraulic pressure is suppressed, and the amplitude of the hydraulic vibration further decreases. As described above, the vibration controller 160 applies the anti-phase signal to the target drive current and sets the target drive current as the instruction current, thereby suppressing hydraulic vibration.

  However, as shown in the half cycle T13 of FIG. 8B, there is a case where the hydraulic pressure whose vibration has subsided is reduced again by the pressure-reducing instruction current. In this case, the belt clamping problem may occur because the belt clamping pressure of the pulley decreases.

  The hydraulic control device according to the embodiment includes a signal cut unit 162 to solve this problem. Hereinafter, the operation of the vibration suppression control according to the embodiment will be described with reference to FIG. FIG. 9 is a diagram illustrating a control operation for damping hydraulic vibration according to the embodiment.

  When the vibration control unit 160 receives a notification that the hydraulic vibration has been detected from the vibration detection unit 140 at time t50, the anti-phase signal generation unit 161 performs, based on the amplitude, frequency, and phase of the immediately preceding vibration cycle, as described above. Generate an anti-phase signal. The signal cut section 162 cuts the signal component on the decompression side of the reverse phase signal and outputs the cut signal to the vibration suppression signal output section 164.

  The solenoid drive unit 130 (FIG. 2) superimposes the target drive current output from the solenoid control unit 120 with an anti-phase signal from which the signal component on the pressure reduction side has been cut, and outputs the resultant to the solenoid valve 21 as a command current. As a result, as shown by the broken line in FIG. 9A, the signal component acting on the pressure reduction side in the command current on which the antiphase signal is superimposed is not output to the solenoid valve 21. In other words, only the anti-phase signal acting on the pressure increasing side is superimposed on the target drive current and output to the solenoid valve 21 as a command current. Accordingly, as shown by the half cycle periods T21, T22, and T23 in FIG. 9B, the hydraulic vibration is gradually suppressed, and it is possible to prevent the hydraulic pressure from suddenly decreasing, thereby reducing the belt clamping pressure. Can be suppressed.

  After starting the vibration suppression control, the end determination unit 163 obtains the amplitude information of the vibration oil pressure from the amplitude detection unit 141, and determines whether the condition for ending the vibration suppression control is satisfied. In FIG. 9B, the amplitude of the hydraulic oscillation in the oscillation cycle indicated by T24 is equal to or smaller than the threshold B1, which is the end condition, for both the pressure-decrease-side amplitude SD and the pressure-increase-side amplitude SU. At T24, it is determined that the end condition is satisfied, and the vibration suppression control is ended at time t51, which is the end point of the vibration cycle T24. As a result, the damping signal output unit 164 stops outputting the damping signal.

<Hydraulic control processing>
Next, a processing procedure of the hydraulic control performed by the hydraulic control device 1 according to the embodiment will be described with reference to FIG. FIG. 10 is a flowchart illustrating a processing procedure of hydraulic control performed by the hydraulic control device 1 according to the embodiment. The hydraulic control device 1 repeatedly executes the control process shown in FIG. 10 when power is supplied by turning on an ignition switch (not shown).

  First, the target oil pressure deriving unit 121 (FIG. 2) calculates a target oil pressure for the primary pulley 3 and the secondary pulley 4 based on various sensor information input from the input unit 110 (Step S21). The opening determiner 122 calculates the target opening of the solenoid valve 21 based on the target oil pressure for each of the pulleys 3 and 4 (Step S22). The first signal generator 123 and the second signal generator 124 generate a target drive current based on the target opening of the solenoid valve 21 and output the target drive current to the solenoid drive 130 (step S23).

  The vibration control unit 160 determines whether a notification indicating that hydraulic vibration has been detected has been received from the vibration detection unit 140 (step S24). When such a notice has not been received (step S24 NO), the vibration control unit 160 proceeds to step S33 without performing the vibration suppression control. In this case, the solenoid drive unit 130 outputs the target drive current generated in step S23 to the solenoid valve 21 as a command current (step S33).

  When receiving the notification that the hydraulic vibration has been detected from the vibration detection unit 140 (YES in step S24), the vibration control unit 160 executes the vibration suppression control in step S25 and subsequent steps.

  First, the anti-phase signal generation unit 161 obtains the amplitude in the hydraulic oscillation cycle immediately before the notification from the amplitude detection unit 141 (Step S25). The antiphase signal generation unit 161 obtains the vibration frequency and the phase in the hydraulic vibration cycle immediately before the notification from the frequency information detection unit 151 (Steps S26 and S27).

  The anti-phase signal generation unit 161 generates an anti-phase signal that gives a hydraulic pressure that is in an opposite phase to the phase of the hydraulic vibration, that is, a sine wave of the anti-phase, based on the amplitude, cycle, and phase of the hydraulic vibration obtained in steps S25 to S27. (Step S28). The signal cut unit 162 cuts the signal component on the side of reducing the oil pressure among the anti-phase signals, and the vibration damping signal output unit 164 outputs the cut anti-phase signal to the solenoid driving unit (step S29).

  The solenoid drive unit 130 combines the anti-phase signal with the reduced pressure side cut with the target drive current generated in step S23 (step S30).

  The end determination unit 163 determines whether or not the end condition of the vibration suppression control is satisfied based on the latest amplitude of the hydraulic vibration obtained in step S25. That is, the end determination unit 163 compares the latest amplitude of the hydraulic vibration with the threshold B1, and when the amplitude is equal to or greater than the threshold B1, determines that the hydraulic vibration is continuing, and proceeds to step S33. In this case, the solenoid drive unit 130 outputs the target drive current synthesized in step S30 to the solenoid valve 21 as a command current (step S33).

  When the end determination unit 163 determines that the amplitude is smaller than the threshold value B1 in step S31 (step S31 YES), the end condition of the vibration suppression control is satisfied, and the vibration suppression control ends (step S32). Specifically, in the process of step S32, the notification of the occurrence of the hydraulic vibration output from the vibration detecting unit 140 is cleared. Accordingly, after the next routine, the vibration control unit 160 determines NO in step S24.

  As described above, according to the hydraulic control device of the embodiment, when hydraulic vibration occurs, the vibration control unit 160 generates, as a vibration suppression signal, an anti-phase signal that gives a hydraulic pressure that is in an opposite phase to the hydraulic vibration phase, The signal component acting in the direction of reducing the oil pressure is reduced. Thus, it is possible to prevent a sudden decrease in the hydraulic pressure in the process of suppressing the hydraulic vibration, and to suppress a reduction in the belt clamping pressure.

<Second embodiment of vibration control unit>
After receiving the notification of the occurrence of the hydraulic vibration, the vibration control unit 160 illustrated in FIG. 7 reduces the signal component acting in the direction of decreasing the hydraulic pressure from the next vibration cycle. In this case, the vibration cycle immediately after the hydraulic vibration is detected cannot be reduced even though the amplitude of the vibration is large, so that it may take time to suppress the hydraulic vibration.

  The vibration control unit 160 'according to the second embodiment improves this point. FIG. 11 is a block diagram showing a configuration of a vibration control unit 160 'according to the second embodiment.

  The vibration control unit 160 'is different from the vibration control unit 160 shown in FIG. 7 in that a signal cut control unit 165 is added and that the control content of the signal cut unit 162' is different from that of the signal cut unit 162. . In the description of FIG. 11, the description of the same components as those of the vibration control unit 160 shown in FIG. 7 will be omitted.

  The signal cut control unit 165 detects that the hydraulic vibration has been attenuated by the vibration suppression control after the vibration detection unit 140 is notified of the occurrence of the hydraulic vibration and starts the vibration suppression control, and controls the signal cut unit 162 ′. . Specifically, the amplitude detecting section 141 detects the amplitude of the vibration hydraulic pressure even after detecting the hydraulic vibration. After starting the vibration suppression control, the signal cut control unit 165 receives the amplitude information of the hydraulic vibration from the amplitude detection unit 141 and determines whether the amplitude of the hydraulic vibration has decreased to a predetermined threshold B2 or less. The threshold value B2 is larger than a threshold value B1 (see FIG. 9) which is a condition for terminating the vibration suppression control, and is smaller than an amplitude threshold value B (see FIG. 3) for detecting hydraulic vibration. For example, B2 can be an intermediate value between the thresholds B and B1 (B2 = (B + B1) / 2). The threshold value B2 is a threshold value for detecting that the hydraulic vibration has been attenuated by the vibration suppression control. In other words, the threshold value B2 is a threshold value that detects a predetermined amount of attenuation from the initial amplitude of the hydraulic vibration, that is, the amplitude in the cycle immediately before the hydraulic vibration is detected.

  When detecting that the amplitude of the hydraulic vibration has attenuated below the threshold value B2, the signal cut control unit 165 causes the signal cut unit 162 'to execute signal reduction control. Specifically, when detecting that one of the pressure-increase-side amplitude SU and the pressure-decrease-side amplitude SD of the hydraulic vibration has attenuated below the threshold value B2, the signal cut control unit 165 causes the signal cut unit 162 'to execute signal reduction control. . Thereby, it is possible to shift to the signal reduction control at an early stage. When detecting that both the pressure-increase side amplitude SU and the pressure-decrease side amplitude SD in one cycle of the hydraulic vibration have attenuated below the threshold value B2, the signal cut control section 165 causes the signal cut section 162 'to execute signal reduction control. Is also good. Thus, it is possible to shift to the signal reduction control without erroneous detection.

  The signal cut section 162 'executes the signal reduction control in response to the fact that the amplitude of the hydraulic vibration has attenuated below the threshold value B2. That is, the signal cut unit 162 ′ reduces, among the anti-phase signals generated by the anti-phase signal generation unit 161, the signal component acting in the direction of reducing the hydraulic pressure described above.

  Subsequently, the operation of the vibration suppression control according to the second embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating a control operation for damping hydraulic vibration according to the second embodiment.

  When the vibration control unit 160 ′ receives a notification that the hydraulic vibration has been detected from the vibration detection unit 140 at the time t60, the anti-phase signal generation unit 161 performs, based on the amplitude, frequency, and phase of the immediately preceding vibration cycle, as described above. , And generates a sine wave-shaped antiphase signal. The signal cut unit 162 'cuts the signal component on the decompression side of the reverse phase signal and outputs the cut signal component to the damping signal output unit 164, but does not operate at time t60. Therefore, the opposite phase signal is output to the vibration suppression signal output unit 164 without being processed as it is.

  The solenoid drive unit 130 (FIG. 2) superimposes a sine-wave anti-phase signal on the target drive current output from the solenoid control unit 120, and as a command current after time t60, as shown in FIG. Output to the solenoid valve 21. In the instruction current, the first half cycle T30 of the first cycle T3 of the opposite phase signal is a sine wave on the pressure reducing side, and the second half cycle T31 is a sine wave on the pressure increasing side. As a result, as shown in FIG. 12B, the amplitude of the hydraulic vibration gradually decreases. FIG. 12B shows that the amplitude of the hydraulic vibration has decreased below the threshold B2 in the latter half cycle T31.

  The signal cut control unit 165 detects that the amplitude of the hydraulic vibration has dropped below the threshold value B2 in the vibration cycle T3 of the hydraulic vibration. Specifically, the signal cut control unit 165 detects that the pressure-decrease-side amplitude SD of the hydraulic vibration has become equal to or smaller than the threshold B2 in the latter half half cycle T31 of the vibration cycle T3. Accordingly, the signal cut control unit 165 permits the signal cut unit 162 'to execute the signal reduction control at the time t61.

  The signal cut section 162 ′ starts operation in response to the permission, cuts a signal component acting on the decompression side of the antiphase signal output after t61, and outputs the cut signal component to the vibration damping signal output section 164. .

  Based on the signal output from the vibration damping signal output unit 164, the solenoid drive unit 130 (FIG. 2) adjusts the target drive current output from the solenoid control unit 120 after time t61, as shown in FIG. The reverse phase signal from which the signal component on the decompression side has been cut is superimposed and output to the solenoid valve 21 as a command current.

  Eventually, when the hydraulic vibration further attenuates and the amplitude of the hydraulic vibration falls below a threshold value B1 (not shown in FIG. 12) for determining the end of the vibration suppression control, the end determination unit 163 ends the vibration suppression control.

<Hydraulic pressure control processing of second embodiment>
Next, a processing procedure of hydraulic control executed by the hydraulic control device 1 according to the second embodiment will be described with reference to FIG. FIG. 13 is a flowchart illustrating a processing procedure of hydraulic control performed by the hydraulic control device 1 according to the second embodiment. FIG. 13 is obtained by adding steps S34 and S35 to the flowchart shown in FIG. In FIG. 13, the description of the same steps as those in FIG. 10 will be omitted.

  When receiving a notification from the vibration detection unit 140 that hydraulic vibration has been detected (step S24: YES), the vibration control unit 160 'starts vibration suppression control starting from step S25. When the vibration suppression control is started, the anti-phase signal generation unit 161 generates an anti-phase signal that gives a hydraulic pressure that is in an opposite phase to the hydraulic vibration phase based on the amplitude, cycle, and phase of the hydraulic vibration obtained in steps S25 to S27. That is, a sine wave having the opposite phase is generated (step S28).

  The signal cut control unit 165 compares the latest amplitude of the hydraulic vibration obtained in step S25 with the threshold value B2 (step S34). If the amplitude is greater than the threshold value B2 (NO in step S34), the signal cut control unit 165 determines that the hydraulic vibration is not sufficiently attenuated, and proceeds to step S35.

  Since the signal cut control unit 165 does not permit the signal reduction control, the signal cut unit 162 'outputs the anti-phase signal generated in step S28 as it is.

  On the other hand, when the signal cut control unit 165 determines that the amplitude has decreased to the threshold value B2 or less (YES in step S34), the signal cut control unit 165 determines that the hydraulic vibration is sufficiently attenuated, and proceeds to step 29. Control of the signal cut of the signal cut unit 162 ′ by the is allowed.

  Upon receiving the permission, the signal cut unit 162 'cuts and outputs the signal component of the reverse phase signal on the side that reduces the hydraulic pressure (step S29).

  As described above, according to the hydraulic control device of the second embodiment, when hydraulic vibration occurs, the vibration control unit 160 ′ generates an anti-phase signal that gives a hydraulic pressure opposite to the hydraulic vibration phase as a vibration suppression signal. I do. After detecting that the hydraulic vibration has attenuated, the vibration control unit 160 'reduces the signal component acting in the direction of reducing the hydraulic pressure.

  This makes it possible to prevent the hydraulic pressure from abruptly decreasing and the belt clamping pressure from decreasing in the process of suppressing the hydraulic vibration while suppressing the hydraulic vibration more quickly.

  As described above in detail, the hydraulic control device 1 according to the embodiment suppresses the hydraulic vibration generated in the hydraulic circuit 2. The hydraulic control device 1 outputs a vibration detection unit 140 that detects a hydraulic vibration generated in the hydraulic circuit 2 and a vibration suppression signal that gives a hydraulic pressure that suppresses the hydraulic vibration when the vibration detection unit 140 detects the hydraulic vibration. A vibration control unit 160. The vibration control unit 160 reduces a signal component acting in the direction of reducing the hydraulic pressure in the vibration suppression signal. Thereby, in the process of suppressing the hydraulic vibration, it is possible to prevent the hydraulic pressure from suddenly decreasing and the belt clamping pressure from decreasing.

  Further, in the hydraulic control device 1 according to the embodiment, the vibration control unit 160 reduces the signal component acting in the direction of decreasing the hydraulic pressure after detecting that the hydraulic vibration has attenuated. Thus, it is possible to prevent the hydraulic pressure from abruptly decreasing and the belt clamping pressure from decreasing in the process of suppressing the hydraulic vibration while suppressing the hydraulic vibration more quickly.

  Further, in the hydraulic control device 1 according to the embodiment, when the amplitude of the hydraulic vibration becomes equal to or less than the predetermined threshold, the vibration control unit 160 reduces the signal component acting in the direction of reducing the hydraulic pressure. This makes it possible to accurately detect that the hydraulic vibration has attenuated.

  In the hydraulic control device 1 according to the embodiment, the vibration damping signal is an anti-phase signal that gives a hydraulic pressure that is in an opposite phase to the phase of the hydraulic vibration based on the vibration characteristic information of the hydraulic vibration. Thereby, the hydraulic vibration can be reliably suppressed.

  In the hydraulic control device 1 according to the embodiment, the vibration characteristic information is the frequency, the phase, and the amplitude of the hydraulic vibration. Thereby, the hydraulic vibration can be reliably suppressed.

  The embodiment of the present invention has been described above, but the above-described embodiment is merely an example for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

Reference Signs List 1 hydraulic control device 2 hydraulic circuit 7 transmission 11 control unit 110 input unit 120 solenoid control unit 130 solenoid drive unit 140 vibration detection unit 150 vibration detection control unit 160 vibration control unit

Claims (6)

A hydraulic control device for suppressing hydraulic vibration generated in a hydraulic circuit,
A vibration detection unit that detects hydraulic vibration generated in the hydraulic circuit,
A vibration control unit that outputs a vibration suppression signal that gives a hydraulic pressure that suppresses the hydraulic vibration when the hydraulic vibration is detected by the vibration detection unit. A hydraulic control device that reduces the signal component that works in the direction of reducing the pressure.   2. The hydraulic control device according to claim 1, wherein the vibration control unit reduces a signal component acting in a direction to reduce the hydraulic pressure after detecting that the hydraulic vibration has attenuated. 3.   The hydraulic control device according to claim 2, wherein the vibration control unit reduces a signal component acting in a direction to reduce the hydraulic pressure when the amplitude of the hydraulic vibration becomes equal to or less than a predetermined threshold.   4. The hydraulic control device according to claim 1, wherein the vibration damping signal is an anti-phase signal that provides a hydraulic pressure having a phase opposite to the phase of the hydraulic vibration based on vibration characteristic information of the hydraulic vibration. 5.   The hydraulic control device according to claim 4, wherein the vibration characteristic information is a frequency, a phase, and an amplitude of hydraulic vibration. A hydraulic control method for suppressing hydraulic vibration generated in a hydraulic circuit,
A vibration detection step of detecting hydraulic vibration generated in the hydraulic circuit,
A vibration control step of outputting a vibration suppression signal for giving a hydraulic pressure that suppresses the hydraulic vibration when the hydraulic vibration is detected in the vibration detection step. The vibration control step includes: A hydraulic control method for reducing a signal component acting in the direction of reducing pressure.

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