JP2629512B2 - Slip control device for vehicle direct coupling clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slip control device for a vehicle direct coupling clutch.

[0002]

2. Description of the Related Art A direct coupling clutch for a vehicle is engaged to eliminate a rotational loss of a torque converter or a fluid coupling, and is provided in, for example, an engagement diagram for a direct coupling to improve fuel efficiency. When the vehicle is running in the slip range or during deceleration, the vehicle is slipped (semi-engaged) to maintain the engine rotation speed at or above the fuel cut rotation speed.

One type of slip control device for controlling the slippage of the direct-coupled clutch is a switching valve for controlling engagement and disengagement of the direct-coupled clutch, and when the direct-coupled clutch is engaged by the switching valve. A slip control valve that controls the slip amount of the direct coupling clutch by adjusting the differential pressure between the engagement side hydraulic pressure and the release side hydraulic pressure of the direct coupling clutch,
Some include a linear solenoid valve that continuously changes a control pressure applied to the slip control valve. For example, this is described in the specification of Japanese Patent Application No. 3-128436. According to such a slip control device, the slip amount of the direct coupling clutch is continuously controlled by continuously changing the control pressure output from the linear solenoid valve.

[0004]

By the way, in the above-mentioned conventional slip control device, the linear solenoid valve used in the device is designed so that the electromagnetic thrust output from the linear solenoid, the urging force of the spring, and the thrust by the feedback pressure are balanced. the by spool is moved is configured to continuously varying the control pressure in accordance with the driving current of the linear solenoid is output, slit
Control is more linear than engagement control.
Spool valve that is operated in relation to the thrust of
Because it moves only within the range,
Foreign matter in the hydraulic oil easily accumulates on the sliding part of the
As a result , if foreign matter in the operating oil accumulates on the sliding portion of the spool valve element, the movement of the spool valve element is affected and the output characteristic of the control pressure shifts, so that the slip control of the direct coupling clutch becomes unstable. There was a case.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle direct-coupled clutch slip control device capable of stably controlling the direct-coupled clutch slip. is there.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is as shown in the gist diagram of the invention in FIG. When the clutch is switched to the engaged state, the slip amount of the direct coupling clutch is controlled by continuously changing the differential pressure between the engagement side hydraulic pressure and the release side hydraulic pressure of the direct coupling clutch using a linear solenoid. In a slip control device including a slip control valve device,
(a) direct-coupled clutch released state detecting means for detecting that the direct-coupled clutch is released, and (b) removing foreign matter that accumulates in the slip control valve device and affects its operation. When the direct coupling clutch release state detecting means detects that the direct coupling clutch has been released, a foreign substance removing operation driving means for performing a foreign substance removing operation on a valve operated in relation to the output of the linear solenoid. Has been provided.

[0007]

In this way, when the direct clutch release state detecting means detects that the direct clutch has been released, the direct clutch is accumulated in the slip control valve device and the operation is stopped. For the purpose of removing the influencing foreign matter, the foreign matter removing operation of the valve which is operated in association with the output of the linear solenoid is performed by the foreign matter removing operation driving means. Thus, the operation of the direct coupling clutch
In the disengaged state of the
Operating in relation to the thrust of the linear solenoid
The valve can be used to remove foreign matter.
Foreign matter in the hydraulic oil accumulated on the sliding parts of the
Therefore, without affecting the operation of the direct coupling clutch,
Product may affect the movement of the valve,
Slip of the direct-coupled clutch without shifting the performance
Control becomes stable.

[0008] Preferably, the driving means for the foreign matter removing operation is provided.
The stage provides a drive current for driving the slip control valve device.
Move the valve of the slip control valve device as the maximum value
You. In this way, the valve element of the slip control valve device is
Slip control because it can be moved with a large stroke
Foreign matter accumulated in the valve device can be removed properly.
You. Preferably, the foreign matter removing operation driving means includes a switch.
The drive current for driving the lip control valve device is periodically
Move the valve of the slip control valve device as the maximum value
You. In this way, the valve element of the slip control valve device is
Because it can be moved with a large stroke,
It is possible to suitably remove foreign matter accumulated in the control valve device.
it can. Further, the foreign matter removing operation driving means includes
Perform the removal operation only within the preset removal operation time.
U. In this way, the foreign matter removing operation removes the foreign matter.
Is performed only during the removal operation time necessary for
It is necessary to properly remove foreign matter accumulated in the lip control valve device.
Can be. Further, the foreign matter removing operation driving means may include:
The foreign matter removal operation is controlled by the slip control valve device.
The accumulated time of the control operation is set to a predetermined reference time.
Perform each time you arrive. This way, slip system
Every time foreign matter that affects the operation of the valve device accumulates,
Unnecessary foreign matter removal operation is performed because foreign matter removal operation is performed.
Never do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a diagram showing a vehicle power transmission device to which an embodiment of the present invention is applied. In the figure, power of an engine 10 is transmitted to drive wheels via a torque converter 12 with a lock-up clutch, an automatic transmission 14, a differential gear device (not shown), and the like.

[0010] The torque converter 12 is an engine 1
Pump wheel 18 connected to crankshaft 16
And a turbine wheel 22 fixed to the input shaft 20 of the automatic transmission 14 and rotated by receiving oil from the pump wheel 18, and fixed to a housing 26 which is a non-rotating member via a one-way clutch 24. Stator wheel 28
And a lock-up clutch 32 connected to the input shaft 20 via a damper 30. When the oil pressure in the release-side oil chamber 33 is higher than that in the engagement-side oil chamber 35 in the torque converter 12, the lock-up clutch 32 is disengaged. Torque is transmitted at a corresponding amplification factor. However, when the oil pressure in the engagement side oil chamber 35 is higher than that in the release side oil chamber 33, the lock-up clutch 32 is engaged, so that the input / output member of the torque converter 12, that is, the crankshaft 16 and the input The shaft 20 is directly connected.

The automatic transmission 14 is constituted by a stepped transmission called a so-called A / T equipped with a plurality of sets of planetary gear units and a frictional engagement device for selectively engaging their elements. The gear ratio between the shaft 20 and the output shaft 34 is changed in multiple stages according to a gear shift command signal from the electronic control unit 42.
The vehicle of this embodiment includes a shift control hydraulic control circuit 44 for controlling the speed ratio of the automatic transmission 14 and an engagement control hydraulic control circuit 46 for controlling the engagement of the lock-up clutch 32. Are provided. The shift control hydraulic control circuit 44 includes a first electromagnetic valve 48 and a second electromagnetic valve 48 which are respectively turned on and off by solenoids No. 1 and No. 2 as described in Japanese Patent Application Laid-Open No. 62-34558. With a valve 50,
The gear stage of the automatic transmission 14 can be switched by a combination of the operations of the solenoid valve 48 and the second solenoid valve 50.

The engagement control hydraulic control circuit 46 includes an electromagnetic switching valve 51, a linear solenoid valve 52 operated by the linear solenoid 40, a release position where the lockup clutch 32 is released, and a lockup clutch. An engagement state switching valve 54 that is switched to an engagement side position where the engagement state is set to an engagement state, and a shift control hydraulic control circuit 44.
The regulator pressure P _cl of the clutch pressure regulating valve (not shown) of the inner is generated according to the throttle valve opening theta _th and a slip control valve 56 to the source pressure. The electromagnetic switching valve 51, the line pressure P _l which are generated by shift control hydraulic control circuit within 44 been made to the original pressure, the electronic control unit 42 the line pressure from the output port 53 by the signal from the P _l And a state where the output port 53 is set to a drain pressure which is an atmospheric pressure. The linear solenoid valve 52 is connected to the thrust and feedback pressure output from the linear solenoid
The spool valve element is operated by equilibrium with the urging force of the ring 41, and a shift control hydraulic control circuit 44
The control pressure P _lin having a magnitude corresponding to the magnitude of the drive current I _sol from the electronic control unit 42 is continuously generated by using the constant modulator pressure P _modu generated within the control pressure as the original pressure. _lin acts on the slip control valve 56. In this embodiment, the linear solenoid valve 52 and the slip control valve 56 constitute a slip control valve device for adjusting the slip amount of the lock-up clutch 32.

The engagement state switching valve 54 includes a spring 58 for urging a spool valve (not shown) toward a release side position, a first port 60 to which the regulator pressure _Pcl is supplied, and a slip control valve 56. , A third port 64 connected to the release side oil chamber 33, and a fourth port 66 connected to the engagement side oil chamber 35.
And a fifth port 68 connected to the drain. When the output pressure of the electromagnetic switching valve 51 is set to the drain pressure, the engagement state switching valve 54
The release position according to the biasing force of 8,
The second port 62 is closed and the first port 60 and the third port 64, and the fourth port 66 and the fifth port 6
8 are communicated with each other. For this reason, the release side oil chamber 3
At the same time, the hydraulic pressure P _off in the engagement side 3 becomes the regulator pressure P _cl and the hydraulic pressure P _on in the engagement side oil chamber 35 becomes the atmospheric pressure, and the lock-up clutch 32 is released. However, when the output pressure of the electromagnetic switching valve 51 is the line pressure P _l, it is switched to the engagement side position spool valve element of the engagement switching valve 54 against the biasing force of the spring 58, the fifth The port 68 is closed, and the communication between the first port 60 and the fourth port 66 and the communication between the second port 62 and the third port 64 are performed. For this reason, the hydraulic pressure P _on in the engagement side oil chamber 35 is set to the regulator pressure P _cl, and at the same time, the hydraulic pressure P _off in the release side oil chamber 33 is pressure-controlled by the slip control valve 56, and the lock-up clutch 32 is Slip controlled or
It is engaged.

The slip control valve 56 includes a spring 70 for urging a spool valve (not shown) to increase the output pressure. In order to generate a thrust toward the output pressure increasing side, a hydraulic pressure P _on in the engagement side oil chamber 35 is applied to the spool valve element, and to generate a thrust toward the output pressure decreasing side. The hydraulic pressure P _off in the release side oil chamber 33 and the output pressure P _{lin of the} linear solenoid valve 52
Are respectively acted on. For this reason, as shown in Equation 1, the slip control valve 56 sets the differential pressure ΔP (= P _on −P _off ) corresponding to the slip amount to the linear solenoid valve 5.
It operates so as to have a value corresponding to the output pressure P _{lin of} 2.
Here, in Equation 1, F is the biasing force of the spring 70,
A ₁ is the pressure receiving area of the hydraulic pressure P _{on at} the spool valve, A ₂
(Where A ₁ = A ₂ ) is the pressure receiving area of the hydraulic pressure P _off , and A ₃ is the pressure receiving area of the output pressure P _lin .

[0015]

ΔP = P _on −P _off = (A ₃ −A ₁ ) P _lin −F / A ₁

During the slip control period of the lock-up clutch 32, the linear solenoid valve 52 is driven in a state where the electromagnetic switching valve 51 is turned on and the engagement state switching valve 54 is switched to the engagement side position. . Normally, the linear solenoid valve 52 is operated so that the actual slip amount of the lock-up clutch 32 matches the target slip amount. In the state where the electromagnetic switching valve 51 is turned off and the engagement state switching valve 54 is switched to the release side position, the lockup clutch 32 does not operate at all regardless of the operation of the linear solenoid valve 52.

The electronic control unit 42 includes a CPU 82, a ROM
84, a RAM 86, a so-called microcomputer comprising an interface (not shown) and the like.
A throttle sensor 88 for detecting an opening degree of a throttle valve provided in an intake pipe 80 of the engine 10;
, An input shaft rotation sensor 92 for detecting the rotation speed of the input shaft 20 of the automatic transmission 14, and an output shaft rotation sensor for detecting the rotation speed of the output shaft 34 of the automatic transmission 14. 94, shift lever 96
From the operation position sensor 98 for detecting any one of the L, S, D, N, R, and P ranges, a signal representing the throttle valve opening degree θ _th , and the engine rotation speed _Ne.
(A signal representing the pump wheel rotation speed N _P ), a signal representing the input shaft rotation speed N _in (turbine wheel rotation speed N _T ), a signal representing the output shaft rotation speed N _out, and the operating position P _{s of the} shift lever 96. Are respectively supplied.

The CPU 82 of the electronic control unit 42 has a RAM
The first solenoid valve 48 is used to process the input signal in accordance with a program stored in the ROM 84 in advance and execute the shift control of the automatic transmission 14 and the engagement control of the lock-up clutch 32 while utilizing the temporary storage function of the ROM 86. , The second solenoid valve 50, the solenoid switching valve 51, and the linear solenoid valve 52, respectively. In the shift control, the target gear is determined based on the actual throttle valve opening _θth from the shift diagram previously stored in the ROM 84 and the vehicle speed V calculated from the output shaft rotation speed N _out , and the actual gear is determined. The first solenoid valve 48 and the second solenoid valve 50 are driven so that the target gear speed coincides with the target gear. In the engagement control of the lock-up clutch 32, the vehicle state represented by the throttle valve opening _θth and the output shaft rotation speed N _out is, for example, a pre-stored release area, slip area, engagement state shown in FIG. It is determined which of the regions the vehicle is in, and the electromagnetic switching valve 51 and the linear solenoid valve 5
2 is controlled. Also, the shift period of the automatic transmission 14,
And the lock-up clutch 32 even during deceleration traveling.
Is executed.

The control operation for removing foreign matter in the linear solenoid valve 52 among the engagement control operations of the electronic control unit 42 will be described below with reference to the flowchart of FIG.

In step S1 of FIG. 4, it is determined whether or not the lock-up clutch 32 is engaged. If the lock-up clutch 32 is in the engaged state, the determination in step S1 is affirmed, and the routine ends. However, if the lock-up clutch 32 is not in the engaged state, the determination in step S1 is denied, and it is determined in the following step S2 whether the slip control of the lock-up clutch 32 is being performed. If the slip control of the lock-up clutch 32 is being performed, the determination in step S2 is affirmative, so that "1" is added to the content of the slip time counting timer CSLP in step S3, and then the present routine is terminated. However, if not in the slip control of the lock-up clutch 32, since the determination in step S2 is negative, subsequent to the first criterion time T ₁ in which the content of the slip time counting timer CSLP is preset in Step S4 It is determined whether or not it has been reached. The first criterion time T ₁ is for determining the accumulated time with a linear solenoid valve 52 to the slip control, the value of a few minutes is employed for example.

Initially, the determination in step S4 is denied, so this routine is terminated. However, if the determination in step S4 is affirmed during the repeated execution of the above steps, the driving current I _sol for driving the linear solenoid valve 52 in the subsequent step S5 becomes:
As shown in FIG. 5, it is turned off by periodically setting the maximum value . The periodic on / off of the drive current I _sol is for removing foreign matter in the hydraulic oil accumulated in the linear solenoid valve 52 by reciprocating the spool valve element of the linear solenoid valve 52 at the maximum stroke accordingly. It is. Since the foreign matter removing operation of the linear solenoid valve 52 is performed in the released state of the lock-up clutch 32, that is, in the released state of the engagement state switching valve 54, the operation of the lock-up clutch 32 is not affected.

Next, in step S6, "1" is added to the content of the removal operation time counting timer CPRD for counting the foreign matter removal operation time of the linear solenoid valve 52, and in step S7, the removal operation time counting timer is added. The second determination reference time T in which the content of CPRD is set in advance
_It is determined whether or not ₂ has been reached. The second criterion time T ₂ are, is for setting a foreign substance removal operation time of the linear solenoid valve 52, the time of several seconds is employed for example.

Initially, the determination in step S7 is denied, so this routine is terminated. However, if the determination in step S7 is affirmative during the repeated execution of the above steps, the content of the slip time counting timer CSLP is cleared to "0" in step S8, and the removal operation time counting timer CLP is cleared in step S9.
The contents of PRD are also cleared to "0".

By repeating the above steps, every time the slip control operation time of the linear solenoid valve 52 elapses T ₁ , the foreign matter removal operation of the linear solenoid valve 52 is performed for T ₂ hours.

That is, in this embodiment, when it is detected that the lock-up clutch 32 has been released in steps S1 and S2 corresponding to the direct-coupled clutch released state detecting means, the accumulation in the linear solenoid valve 52 is performed. The driving current for driving the linear solenoid valve 52 is determined by step S5 corresponding to the foreign matter removing operation driving means for the purpose of removing foreign matter affecting its operation.
As spool by I _sol is a cyclically maximum
The reciprocating valve is reciprocated at the maximum stroke accordingly to remove foreign matter in the operating oil that accumulates on its sliding parts, so that the movement of the spool valve is affected or controlled due to the accumulation. The output characteristics of the pressure do not shift, and the slip control of the lock-up clutch 32 is stabilized.

Further, according to the present embodiment, the automatic transmission 14
At any gear, the linear solenoid valve 52 can be operated to remove foreign matter in the disengaged state of the lock-up clutch 32, so that the reliability of the linear solenoid valve 52 against foreign matter in hydraulic oil can be further improved. it can.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the embodiment shown in FIG. 6, the electromagnetic switching valve 51 of the embodiment shown in FIG. 2 is eliminated, and the control pressure P _lin output from the linear solenoid valve 52 is applied to the engagement state switching valve 54.
Are also supplied. That is, the engagement state switching valve 54 is connected to the linear solenoid valve 5 supplied thereto.
When the control pressure P _lin falls below a predetermined value, the spool valve is moved to the release position in accordance with the biasing force of the spring 58 to close the second port 62 and to release the first port. 60 and the third port 64,
And between the fourth port 66 and the fifth port 68. Therefore, the control pressure P of the linear solenoid valve 52 applied to the spool valve element of the engagement state switching valve 54
_{When lin} falls below a predetermined value, the spool valve element of the engagement state switching valve 54 is positioned at the release side in accordance with the biasing force of the spring 58, and the hydraulic pressure P _off in the release side oil chamber 33 is reduced. lockup clutch 32 pressure P _on in the regulator pressure P _cl and is being at the same time the engagement side oil chamber 35 is at atmospheric pressure is released. However, the engagement state switching valve 5
4 a linear solenoid valve 52 acting on the spool valve element
When the output pressure P _lin exceeds a predetermined value,
The spool valve element of the engagement state switching valve 54 is switched to the engagement side position against the urging force of the spring 58 to close the fifth port 68, and the first port 60, the fourth port 66, and the The communication between the second port 62 and the third port 64 is made respectively. For this reason, the hydraulic pressure P _on in the engagement side oil chamber 35 is set to the regulator pressure P _cl, and at the same time, the hydraulic pressure P _off in the release side oil chamber 33 is pressure-controlled by the slip control valve 56, and the lock-up clutch 32 is The slip is controlled or released. FIG. 7 shows the output characteristics of the engagement state switching valve 54 related to the control pressure _Plin output from the linear solenoid valve 52.

In the above-described embodiment, the regulator generated as the base pressure of the engagement state switching valve 54 and the slip control valve 56 by the clutch pressure regulating valve in the shift control hydraulic control circuit 44 in accordance with the throttle valve opening θ _th. When the shift lever 96 is operated to the N range and when the automatic transmission 14 is in the first speed, the pressure P _cl is set to a manual valve or gear position (not shown) that is switched in relation to the shift lever 96. in connection with the operation of the shift valve is switched in conjunction with the switching engagement switching valve 54
And is not supplied to the slip control valve 56. Therefore, in the present embodiment, as shown in the flowchart of FIG. 8, when it is determined in step S10 that the shift lever 96 has been operated to the N range, or in step S11, the automatic transmission 14 When it is determined that the gear is in the gear position, a periodic drive current for the foreign matter removing operation is output in step S5. In the present embodiment, the above step S10
Alternatively, step S11 corresponds to the directly-coupled clutch released state detecting means.

While one embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in step S5 of the above-described embodiment, a periodic drive current for performing a foreign substance removing operation of periodically reciprocating the spool valve element of the linear solenoid valve 52 is output as shown in FIG. However, for example, even if the foreign substance removing operation is performed only once, a certain effect can be obtained. Further, the peak value of the periodic drive current may not be the maximum value of the drive current.

In the above-described embodiment, the linear solenoid valve 52 and the slip control valve 56 independently constitute a slip control valve device. However, the linear solenoid and the spool valve are housed in a common valve housing. It may be configured to be provided with a slip control function in a state in which the slip control is performed.

In the above embodiment, the torque converter 12 having the lock-up clutch 32 has been described. However, a fluid coupling having the lock-up clutch 32 may be used.

The automatic transmission 14 of the above-described embodiment is
Although a planetary gear type continuously variable transmission is used, a belt type continuously variable transmission including a pair of variable pulleys having a variable effective diameter and a transmission belt wound around them may be used.

The above is merely an example of the present invention, and the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing the gist of the present invention.

FIG. 2 is a diagram showing a vehicle power transmission device including a slip control device according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship used in engagement control of a lock-up clutch by the electronic control device of FIG. 2;

FIG. 4 is a flowchart illustrating a control operation for removing foreign matter from a lock-up clutch by the electronic control device of FIG. 2;

FIG. 5 is a diagram showing an example of a drive current in the foreign matter removing operation of FIG.

FIG. 6 is a diagram corresponding to FIG. 2 in another embodiment of the present invention.

7 is a diagram showing output characteristics of an engagement state switching valve related to output pressure P _lin of a linear solenoid valve in the engagement control hydraulic control circuit in the embodiment of FIG. 6;

FIG. 8 is a diagram corresponding to FIG. 4 in the embodiment of FIG. 6;

[Explanation of symbols]

 Reference Signs List 32 lock-up clutch (direct coupling clutch) 52 linear solenoid valve (slip control valve device) 56 slip control valve (slip control valve device) 42 electronic control device Steps S1 and S2 Direct coupling clutch release state detecting means Step S5 foreign matter removing operation driving means S10 Direct-coupled clutch released state detecting means Step S11 Direct-coupled clutch released state detecting means

Continuation of the front page (72) Inventor Shinya Nakamura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-61-201903 (JP, A) JP-A-4-331866 (JP, A) JP-A-62-34558 (JP, A) JP-A-2-304260 (JP, A)

Claims (5)

(57) [Claims] In a vehicle having a fluid transmission device with a direct-coupled clutch, when the direct-coupled clutch is switched to an engaged state, a differential pressure between an engagement-side hydraulic pressure and a release-side hydraulic pressure of the direct-coupled clutch is transmitted to a linear solenoid. A slip control device provided with a slip control valve device for controlling the slip amount of the direct-coupled clutch by continuously changing the direct-coupled clutch by utilizing the direct-coupled clutch. Means for removing foreign matter that accumulates in the slip control valve device and affects its operation, when the direct coupling clutch release state detecting means detects that the direct coupling clutch has been released. And a foreign matter removing operation driving means for performing a foreign matter removing operation on a valve operated in relation to the thrust of the linear solenoid. Slip control device for a vehicular lockup clutch to symptoms. 2. The method according to claim 1, wherein said foreign matter removing operation driving means includes a slip.
The drive current for driving the control valve device is set as the maximum value.
Claim: Moving a valve element of a slip control valve device
Item 2. A slip control device for a vehicle direct-coupled clutch according to Item 1. 3. The apparatus according to claim 1, wherein said foreign matter removing operation driving means includes a slip.
The drive current for driving the control valve device is periodically increased to the maximum value.
To move the valve of the slip control valve device.
2. A slip system for a vehicle direct-coupled clutch according to claim 1.
Control device. 4. The foreign matter removing operation driving means according to claim 1 , wherein
Perform the removal operation only during the preset removal operation time.
The vehicle straight line according to any one of claims 1 to 3, wherein
Slip control device for coupling clutch. 5. The foreign matter removing operation driving means according to claim 1 , wherein
The removal operation is controlled by the slip control valve device.
Cumulative operation time reaches a preset reference time
5. The method according to claim 1, wherein the step is performed every time
4. The slip control device for a vehicle direct-coupled clutch according to claim 1.