KR20190102783A - Constant Hydraulic Coupling type Hydraulic Control Circuit and Auto Transmission thereof - Google Patents

Abstract

According to the present invention, in an auto transmission, operation of a torque converter (1) is controlled by a hydraulic control circuit (10) formed with a damper control circuit (20) for a constant hydraulic coupling with a damper on/off control circuit (20-1, 20-2). Therefore, when a damper is turned on, a coupling state of supply hydraulic pressure (T_in), discharge hydraulic pressure (T_out), and lock-up hydraulic pressure (LU) with respect to a torque converter pressure control valve is equally realized when the damper is turned off. Moreover, after the transmission is left, a damper differential pressure behavior defective phenomenon that may occur when the transmission is operated one time can be fundamentally prevented.

Description

Constant Hydraulic Coupling type Hydraulic Control Circuit and Auto Transmission

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and more particularly, to an automatic transmission having a constant hydraulic linkage type hydraulic control circuit in which hydraulic interlocking is performed even when a damper of a torque converter is turned on / off.

In general, an automatic transmission for a vehicle includes a torque converter controlled by a hydraulic control circuit, and the hydraulic control circuit operates the torque converter so that the automatic transmission automatically performs a proper shift in accordance with a driving condition.

To this end, the torque converter includes a cover that receives power from the engine, a damper (or lockup clutch) that transmits power during lockup between the turbine, the turbine, and the impeller rotated through the operating oil. The hydraulic control circuit controls the torque converter together with the hydraulically actuated friction element for shift gear stage selection by control valve control for the hydraulic pressure of the oil pump.

Therefore, the automatic transmission is automatically made through the operation of the torque converter and the hydraulic control circuit in accordance with the driving condition.

1 and 2 show an example of a hydraulic control circuit 10 for controlling a 3-way type torque converter 1 of an eight-speed automatic transmission.

As shown, the hydraulic control circuit 10 controls the hydraulic pressure to the control pressure by the lock-up switch valve 21, torque converter pressure control valve 22, torque converter control valve 23, proportional control solenoid valve 24 The valves 21, 22, 23, and 24 are formed of spool valves that form a plurality of lands that move hydraulically to perform hydraulic supply / discharge by opening and closing ports according to movement. For example, the lock-up switch valve 21 is composed of a spool valve to control the control pressure in conjunction with the proportional control solenoid valve 24, the torque converter pressure control valve 22 is composed of a spool valve torque converter control valve ( 23) to control the control pressure for the coupling and release pressure of the damper, the torque converter control valve 23 is composed of a spool valve in conjunction with the lock-up switch valve 21 to control the control pressure, the proportional control The solenoid valve 24 is composed of a spool valve and is connected to the torque converter pressure control valve 22 to supply a control pressure. In particular, the lock-up switch valve 21 and the torque converter control valve 23 is applied to the line pressure supplied from the regulator valve to the torque converter 1 in order to increase the torque of the torque converter 1 during acceleration and improve fuel efficiency at high speed. It is supplied under reduced pressure.

Therefore, the hydraulic control circuit 10 is connected to the torque converter supply port 3 and the torque converter lock-up clutch control port 5 of the torque converter 1 to control the torque converter supply / discharge hydraulic pressures T_in and T_out, respectively. The damper control circuit 20 and the cooling / lubrication control circuit 30 is divided into.

The damper pressure control circuit 20-1 of the damper control circuit 20 has a torque converter supply line 25-1 from the torque converter supply port 3 to the torque converter control valve 23, and the lock-up switch_tocon The pressure line 25-2 is connected from the torque converter pressure control valve 22 to the lockup switch valve 21, and the lockup switch_tocon control line 25-3 is connected from the lockup switch valve 21 to the torque converter control valve. Leads to (23).

The damper ON control circuit 20-2 of the damper control circuit 20 has a torque converter lock-up clutch supply line 27-1 from the torque converter lock-up clutch control port 5 to the torque converter pressure control valve 22. Subsequently, the token pressure branch line 27-2 is branched from the torque converter lock-up clutch supply line 27-1 to the torque converter pressure control valve 22. Here, the lock-up switch means a lock-up switch valve 21, the tocon pressure means a torque converter pressure control valve 22, and the tocon control means a torque converter control valve 23, respectively.

In addition, the cooling / lubrication control circuit 30 has a cooling / lubrication line 31 connected to the lock-up switch valve 21.

1 is an operation state of the hydraulic control circuit 10 when the damper is ON. In this case, the torque converter pressure control valve 22 is provided with a torque converter supply line 25-1 and a lock-up switch_tocon control line 25-3. The supply hydraulic pressure T_in of the torque converter supply port 3 is supplied from the lock-up switch_tocon pressure line 25-2 via the torque converter lock-up clutch supply line 27-1 and the token pressure branch line 27-2. ), The discharge oil pressure T_out of the torque converter lock-up clutch control port 5 is supplied. As a result, the torque converter pressure control valve 22 is in a state in which the cooling / lubrication control circuit 30 supplied to the lockup switch valve 21 is interlocked with the lockup hydraulic pressure LU applied to the cooling / lubrication line 31. In this case, the discharge oil pressure T_out supplied to the torque converter pressure control valve 22 exits to the drain line after land movement control of the torque converter pressure control valve 22. The torque converter control valve 23 is connected to the lockup switch valve 21 through the lockup switch_tocon control line 25-3 to supply the lubricating oil flow rate to the cooling / lubrication line 31.

On the other hand, Figure 2 is the operating state of the hydraulic control circuit 10 when the damper is OFF, in this case the discharge hydraulic pressure (T_out) through the torque converter lock-up clutch supply line (27-1) by blocking the torque converter lock-up clutch control port (5). The supply oil is stopped and the discharge oil pressure T_out remaining in the land return of the torque converter pressure control valve 22 is discharged to the drain line.

Korean Unexamined Patent Publication 10-2014-0146908 (December 29, 2014)

However, the hydraulic control circuit 10 interlocks the supply hydraulic pressure T_in, the discharge hydraulic pressure T_out and the lockup hydraulic pressure LU to the torque converter pressure control valve 22 when the damper is ON, while the torque converter pressure control valve is ON when the damper is OFF. By shutting off the discharge oil pressure T_out of 22, it is possible to form the cause of the damper differential pressure behavior NG (No Good) for the torque converter pressure control valve 22.

Figure 3 illustrates the damper differential pressure normal control return state in the two times operation to the damper differential pressure average pressure drop phenomenon in one operation after leaving the automatic transmission. As shown, the discharge hydraulic pressure (T_out) is left empty in the torque converter pressure control valve 22 when the automatic transmission is left, and the air converter in the torque converter pressure control valve 22 is inevitably brought to the damper ON after the automatic transmission is left. . As a result, the torque converter 1 generates a damper differential pressure behavior defect due to air bleeding from the torque converter pressure control valve 22.

In view of the above, the present invention implements the transmission state of the supply pressure T_in, the discharge oil pressure T_out and the lock-up oil pressure LU to the torque converter pressure control valve when the damper is turned on by implementing the same when the damper is OFF. It is an object of the present invention to provide an automatic transmission with a permanent hydraulically coupled hydraulic control circuit that essentially prevents damper differential pressure behavior that may occur during one operation after leaving.

The hydraulic control circuit of the present invention for achieving the above object is a lock-up switch valve that is connected to the torque converter discharge line connected to the cooling / lubrication line is connected to the torque converter supply hydraulic pressure and the torque converter supply hydraulic pressure is supplied to the torque converter supply hydraulic pressure; A lock-up switch_torcon pressure constant line connecting the torque converter pressure control valve is connected; The lock-up switch_tocone pressure constant line is filled with the torque converter discharge oil pressure when the damper is turned off, and the lock-up switch_tocone control line connected from the lock-up switch valve to the torque-converter control valve is blocked, so that the torque converter supply hydraulic pressure It is characterized in that it is not supplied to the lubrication line.

In a preferred embodiment, the torque converter pressure control valve is connected to a torque converter lock-up clutch supply line, which is connected to a torque converter lock-up clutch control port and is filled with a lock-up hydraulic pressure.

In a preferred embodiment, the lockup switch valve is connected to a lockup switch_tocon pressure line connected to a proportional control solenoid valve, and the lockup switch_tocon pressure line is shut off of the lockup switch_tocon control line by hydraulic pressure of the proportional control solenoid valve. Releases. The lock-up switch_tocone pressure line is connected to a proportional control solenoid valve line of the proportional control solenoid valve. The lockup switch_tocone pressure line and the proportional control solenoid valve line are connected to a tocone pressure line from the torque converter pressure control valve.

In a preferred embodiment, the lock-up switch valve is connected to the branch line of the torque converter supply line for supplying the torque converter supply hydraulic pressure, the branch line is connected to the cooling / lubrication line connected to the torque converter discharge line to form a connection structure The connection structure is provided with an orifice. The lock-up switch valve shuts off the branch line by land movement when the damper is off so that the torque converter supply hydraulic pressure is not filled in the cooling / lubricating line. The torque converter control valve is connected to the torque converter pressure control valve by a token pressure control line.

In addition, the automatic transmission of the present invention for achieving the above object is a torque converter supply hydraulic pressure and a torque converter discharge hydraulic pressure is formed, respectively, the torque converter supply hydraulic pressure is a lock-up hydraulic pressure of the damper is formed; A constant hydraulic linked hydraulic control circuit in which the torque converter discharge hydraulic pressure, the torque converter supply hydraulic pressure, and the lockup hydraulic pressure are linked through an operation of a lockup switch valve when the damper is switched on and off; Characterized in that it is included.

In a preferred embodiment, the operation of the lock-up switch valve consists of hydraulic control of the proportional control solenoid valve at the time of switching the damper on and off.

In a preferred embodiment, the hydraulic pressure of the proportional control solenoid valve when the damper is off results in a land movement of the lock-up switch valve by emptying the lock-up switch_tocon pressure line leading to the lock-up switch valve, and the land movement discharges the torque converter. The hydraulic pressure is shut off at the torque converter pressure control valve to fill the cooling / lubrication line, while the torque converter supply hydraulic pressure is cut off at the lockup switch valve to fill the torque converter control valve.

In a preferred embodiment, the hydraulic pressure of the proportional control solenoid valve when the damper is on fills the lock-up switch_tocon pressure line leading to the lock-up switch valve, resulting in land movement of the lock-up switch valve, and the land movement is the torque converter discharge hydraulic pressure. Is filled in the cooling / lubricating line while blocking the torque converter pressure control valve and the torque converter control valve, while the torque converter supply hydraulic pressure is blocked in the torque converter pressure control valve while filling the lock-up switch valve and the torque converter control valve. .

The automatic transmission of the present invention is provided with a constant hydraulic linked hydraulic control circuit connected to the torque converter, the constant hydraulic linked hydraulic control circuit has a supply hydraulic pressure (T_in) and discharge hydraulic pressure (T_out) and a pressure to the torque converter pressure control valve By implementing the same interlocking state of the lock-up hydraulic pressure (LU) not only when the damper is ON but also when the damper is OFF, the damper differential pressure behavior that may occur during one operation after the transmission is left essentially prevented.

In addition, the automatic transmission according to the present invention does not generate a damper differential pressure behavior failure by the operation of the torque converter by the constant pressure hydraulic control circuit, thereby satisfying the performance of the existing structure while reducing the damper pressure and vibration generated when leaving the transmission. It is effective to greatly improve.

1 is a hydraulic control circuit operation state when the damper of the torque converter applied to the conventional automatic transmission, Figure 2 is a hydraulic control circuit operation state when the damper OFF of the conventional torque converter, Figure 3 is a conventional torque converter Figure 1 shows an example of the damper differential pressure normal return control diagram when the damper differential pressure is released after the average pressure is released once, and when the damper of the torque converter applied to the automatic transmission according to the present invention is always turned on. 5 is an operating state of the control circuit, and FIG. 5 is an operating state of the hydraulic control circuit at all times when the damper of the torque converter according to the present invention is turned on.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be implemented in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. Not limited to the embodiment.

4 and 5 are hydraulic control circuits 10 for controlling the 3-way type torque converter 1 of the 8-speed automatic transmission, and the hydraulic control circuits 10 include the lock-up switch valve 21 as shown in FIGS. The torque converter pressure control valve 22, the torque converter control valve 23, and the proportional control solenoid valve 24 are configured to control the hydraulic pressure to the control pressure. In this case, FIGS. 4 and 5 are diagrams illustrating an interlocking state of the supply hydraulic pressure T_in, the discharge hydraulic pressure T_out, and the lockup hydraulic pressure LU for the torque converter pressure control valve 22 when the damper is ON only when the damper is ON. Unlike, 2, since the same difference is formed when the damper is OFF, the control pressure action of the same components based on the same operation including the valves 21, 22, 23, and 24 is assumed to be the same.

4 and 5, the hydraulic control circuit 10 supplies the hydraulic pressure to the torque converter pressure control valve 22 even when the damper is turned off by linking the damper control circuit 20 and the cooling / lubrication control circuit 30. The interlocking state of the T_in, the discharge oil pressure T_out, and the lock-up oil pressure LU is implemented in the same way as the damper ON, thereby controlling the operation of the torque converter 1 to be always hydraulically coupled.

Specifically, the hydraulic control circuit 10 has a plurality of valves for controlling the path of the torque converter supply / discharge hydraulic pressure (T_in, T_out) and a plurality of hydraulic lines connecting the hydraulic path of the valves, these valves and hydraulic lines Torque converter supply / discharge hydraulic pressure (T_in, T_out) generated at the torque converter supply / discharge port (3) of the torque converter (1) and lock-up hydraulic pressure (LU) generated at the torque converter lock-up clutch control port (5) It is divided into a damper control circuit 20 and a damper control cooling / lubrication control circuit 30 for controlling the.

Here, the plurality of valves are composed of a lockup switch valve 21, a torque converter pressure control valve 22, a torque converter control valve 23, a proportional control solenoid valve 24, and an orifice 28. The multiple hydraulic lines are the torque converter supply line (25-1A) and torque converter discharge line (25-1B), tocon pressure_control line (25-6), torque converter lock-up clutch supply line (27-1), tocon pressure Control valve inlet line (27-1-1), token pressure branch line (27-2), lockup switch_tocone pressure constant line (27-3), lockup switch_tocone control line (27-4), lockup pressure supply A line 25-5, a token pressure line 27-6, a proportional control solenoid valve line 27-7, and a cooling / lubricating line 31.

Therefore, the hydraulic control circuit 10 is connected to the torque converter supply / discharge port 3 and the torque converter lock-up clutch control port 5 which control the torque converter supply / discharge hydraulic pressures T_in and T_out of the torque converter 1, respectively. The damper control circuit 20 and the cooling / lubrication control circuit 30 is connected.

For example, the torque converter supply line 25-1A, the torque converter discharge line 25-1B, and the tocone pressure_control line 25-6 constitute a torque converter supply port connection line of the damper control circuit 20. do. The torque converter supply line 25-1A exits the torque converter supply / discharge port 3 into which the torque converter supply hydraulic pressure T_in enters, leads to the torque converter control valve 23, and simultaneously to the lockup switch valve 21. Branched to connect with cooling / lubrication line 31.

In particular, an orifice 28 is provided as a connection portion between the torque converter supply line 25-1A and the cooling / lubrication line 31, and the orifice 28 discharges the torque converter supply line 25-1A from the torque converter. In connection with the line 25-1B, the torque converter supply hydraulic pressure T_in coming into the lock-up switch valve 21 is sent out to the torque converter discharge line 25-1B. The tocone pressure control line 25-6 exits the torque converter pressure control valve 22 and directly to the torque converter control valve 23 without passing through the lockup switch valve 21.

For example, the torque converter lock-up clutch supply line 27-1, the tocon pressure control valve inlet line 27-1-1, the tocon pressure branch line 27-2, and the lock-up switch_tocon pressure constant line ( 27-3), the lockup switch_tocone control line 27-4, the lockup pressure supply line 25-5, the tocone pressure line 27-6, and the proportional control solenoid valve line 27-7. And the cooling / lubrication line 31 constitutes a torque converter discharge port linkage line of the damper control circuit 20.

The torque converter lock-up clutch supply line 27-1 supplies the lock-up hydraulic pressure LU to the torque converter pressure control valve 22 after the torque converter lock-up clutch control port 5 and the torque converter pressure control valve 22. . The tocone pressure control valve inlet line 27-1-1 discharges the remaining lockup hydraulic pressure LU when the torque converter pressure control valve 22 is returned to land. The tocone pressure branch line 27-2 is branched from the torque converter lock-up clutch supply line 27-1 to the torque converter pressure control valve 22. The lock-up switch_tocone pressure constant line 27-3 exits the lock-up switch valve 21 and is connected to the torque converter pressure control valve 22. The lock-up switch_tocon control line 27-4 exits the lock-up switch valve 21 and connects to the torque converter control valve 23. The lockup switch_tocone pressure line 27-5 exits the lockup switch valve 21 and connects with the tocone pressure line 27-6. The tocone pressure line 27-6 exits the torque converter pressure control valve 22 and is connected to the lock-up switch_tocone pressure line 27-5 to branch the proportional control solenoid valve line 27-7. The proportional control solenoid valve line 27-7 connects the proportional control solenoid valve 24 and the token pressure line 27-6. Here, the lock-up switch means a lock-up switch valve 21, the tocon pressure means a torque converter pressure control valve 22, and the tocon control means a torque converter control valve 23, respectively.

For example, the cooling / lubrication control circuit 30 includes a cooling / lubrication line 31, and the cooling / lubrication line 31 is connected to the torque converter discharge line 25-1B.

On the other hand, referring to the hydraulic formation of the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 when the damper is OFF in FIG. 4, the proportional control solenoid valve 24 is turned off to be proportional. The control solenoid valve line 27-7 and the tocone pressure line 27-6 and the lockup switch_tocone pressure line 27-5 are not filled with hydraulic pressure. The lock-up switch valve 21 is then moved forward in the land position in the initial state (ie the land position in FIG. 5).

Then, the torque converter supply line 25-1A supplies the supply hydraulic pressure T_in of the torque converter 1 to the torque converter control valve 23 in a state in which the torque converter supply line 25-1A is disconnected to the land position of the lock-up switch valve 21. The tocone pressure control valve inlet line 27-1-1 blocks the remaining lockup hydraulic pressure LU of the torque converter pressure control valve 22. The lock-up switch_tocone pressure constant line 27-3 converts the discharge oil pressure T_out of the torque converter 1 from the torque converter discharge line 25-1B connected to the land position of the lock-up switch valve 21 to the torque converter. Supply to the pressure control valve (22). The cooling / lubrication line 31 forms a standby state in which the discharge hydraulic pressure T_out is supplied through the torque converter discharge line 25-1B.

As a result, the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 are turned off of the proportional control solenoid valve 24 and the lock-up switch_tocon pressure line 27-5 and the tocon pressure line (27-6) and the proportional control solenoid valve line (27-7) is formed without the hydraulic pressure.

Therefore, the land movement of the lock-up switch valve 21 and the torque converter pressure control valve 22 is such that the supply hydraulic pressure T_in and the discharge oil pressure T_out have the lock-up switch valve 21 and the torque converter pressure control valve 22 and the torque converter. While acting on the control valve 23, the lock-up hydraulic pressure (LU) acts to shut off the torque converter pressure control valve 22.

From this, the torque converter supply hydraulic pressure T_in is filled with the torque converter supply line 25-1A connecting the torque converter control valve 23 to connect the torque converter pressure control valve 22 and the torque converter control valve 23. Filled with Token Pressure_Control Line 25-6. At the same time, the torque converter discharge hydraulic pressure (T_out) is the lock-up switch_torcon pressure constant line (27-3) connecting the lock-up switch valve 21 and the torque converter pressure control valve 22 in the torque converter discharge line (25-1B). Is filled.

Therefore, the hydraulic pressure of the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 when the damper is turned off is the torque converter supply line 25-1A, the torque converter discharge line 25-1B, Token pressure_control line (25-6), lock-up switch_tocon pressure constant line (27-3) and cooling / lubrication line (31) are lockup switch valve (21), torque converter pressure control valve (22) and torque converter It is linked to the control valve 23.

In this flow path formation, the torque converter discharge oil pressure T_out is supplied to the cooling / lubrication line 31 as a lubricating oil flow rate.

On the other hand, referring to the hydraulic formation of the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 when the damper is ON in FIG. 5, the proportional control solenoid valve is turned on by the proportional control solenoid valve 24 is turned on. Lines 27-7 and tocone pressure lines 27-6 and lock-up switch_tocone pressure lines 27-5 are filled with the hydraulic pressure of the proportional control solenoid valve 24. The lock-up switch valve 21 then returns to its initial state by moving the land position back.

Then, the torque converter supply line 25-1A connects the supply oil pressure T_in of the torque converter 1 with the lockup switch valve 21 together with the lockup switch valve 21 in a state of being connected to the land position of the lockup switch valve 21. 23). The torque converter lock-up clutch supply line 27-1, the tocone pressure control valve inlet line 27-1-1 and the tocone pressure branch line 27-2 are the initial land of the torque converter pressure control valve 22. The return is filled with the lock-up hydraulic pressure (LU) in the state connected with the torque converter lock-up clutch control port (5). The lock-up switch_tocone pressure constant line 27-3, the lock-up switch_tocone control line 27-4, and the cooling / lubrication line 31 are torque converters 1 from the torque converter discharge line 25-1B. Is filled with the discharge oil pressure (T_out). The lock-up switch_tocone pressure line 27-5 and the tocone pressure line 27-6 and the proportional control solenoid valve line 27-7 are hydraulically formed by turning on the proportional control solenoid valve 24. As a result, the land of the lockup switch valve 21 is moved so that the supply hydraulic pressure T_in and the discharge hydraulic pressure T_out act on the lockup switch valve 21.

As a result, the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 are discharged from the proportional control solenoid valve 24 to the hydraulic pressure lock-up switch_tocon pressure line 27-5 and the tocon pressure line 27. -6) and the proportional control solenoid valve line 27-7 is filled.

Therefore, the land movement of the lock-up switch valve 21 and the torque converter pressure control valve 22 is such that the supply hydraulic pressure T_in, the discharge hydraulic pressure T_out, and the lock-up hydraulic pressure LU are the lock-up switch valve 21 and the torque converter pressure control valve. (22) and torque converter control valve (23).

From this, the torque converter supply hydraulic pressure T_in is filled with the torque converter supply line 25-1A connecting the lockup switch valve 21 and the torque converter control valve 23, and the torque converter pressure control valve 22 and the torque converter. It is filled with a token pressure control line 25-6 connecting the control valve 23. At the same time, the torque converter discharge oil pressure T_out is connected to the lockup switch valve 21 and the torque converter pressure control valve 22 together with the lockup switch_tocon pressure constant line 27-3, and the lockup switch valve 21 and the torque converter. It is filled with a lock-up switch_tocon control line 27-4 connecting the control valve 23. In addition, the lock-up hydraulic pressure (LU) is the tocone pressure control valve inlet line (27-1-1) and the torque converter lock-up clutch supply line (27-1) and the tocone pressure branch line (27) leading to the torque converter pressure control valve (22). Via -2) is filled into the torque converter lock-up clutch control port (5).

Therefore, the hydraulic pressure of the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 when the damper is turned on is the torque converter supply line 25-1A, the torque converter discharge line 25-1B, Tocon pressure_control line (25-6), Tocon pressure control valve inflow line (27-1-1) and torque converter lock-up clutch supply line (27-1), tocon pressure branch line (27-2), lock-up switch_ Token pressure constant line 27-3, lock-up switch_tocon pressure line 27-5, token pressure line 27-6, proportional control solenoid valve line 27-7 and cooling / lubrication line 31 It is connected to the lockup switch valve 21, the torque converter pressure control valve 22, the torque converter control valve 23 and the proportional control solenoid valve 24.

In this flow path formation, the torque converter discharge oil pressure T_out is supplied to the cooling / lubrication line 31 as a lubricating oil flow rate.

As described above, the constant hydraulic linkage between the damper pressure control circuit 20-1 and the damper ON control circuit 20-2 constituting the damper control circuit 20 is performed even when the automatic transmission is left. The discharge oil pressure (T_out) is filled in the torque converter pressure control valve 22 through), which is caused by the air divergence phenomenon and the damper in the torque converter pressure control valve 22 when the damper is turned on after the automatic transmission is left as shown in FIG. 3. The differential pressure behavior can be prevented.

As described above, the automatic transmission according to the present embodiment is a hydraulic control circuit composed of a damper pressure control circuit 20-1 and a damper control circuit 20 capable of constant hydraulic linkage with the damper ON control circuit 20-2. 10) by controlling the operation of the torque converter 1, the interlocking state of the supply hydraulic pressure T_in, the discharge hydraulic pressure T_out and the lock-up hydraulic pressure LU to the torque converter pressure control valve at the damper ON is the same even when the damper is OFF. In this way, the damper differential pressure behavior that can occur in one operation after the transmission is left essentially prevented.

1: Torque converter 3: Torque converter supply port
5: Torque converter lock-up clutch control port
10: hydraulic control circuit
20: damper control circuit 20-1: damper pressure control circuit
20-2: damper ON control circuit 21: lock-up switch valve
22: torque converter pressure control valve
23: torque converter control valve
24: proportional control solenoid valve
25-1: Torque Converter Supply Line
25-2: Lock-up switch_tocon pressure line
25-3,27-4: Lockup Switch_Token Control Line
25-5: Lock-up pressure supply line 25-6: Token pressure_control line
27-1: Torque Converter Lockup Clutch Supply Line
27-2: Tocon pressure branch line 27-3: Lock-up switch_tocon pressure constant line
27-5: Lock-up switch_tocon pressure line
27-6: Token pressure line 27-7: Proportional solenoid valve line
30: cooling / lubrication control circuit 31: cooling / lubrication line

Claims (6)

The torque converter discharge line connected to the cooling / lubrication line is connected, and the torque converter supply line is connected with the torque converter discharge hydraulic pressure. Connected;
The lock-up switch_tocone pressure constant line is filled with the torque converter discharge oil pressure when the damper is turned off, and the torque-converter supply hydraulic pressure Always hydraulically coupled hydraulic control circuit, characterized in that not supplied to the lubrication line.
The hydraulic control circuit of claim 1, wherein the torque converter pressure control valve is connected to a torque converter lock-up clutch control port and filled with a lock-up hydraulic pressure.
The lockup switch valve is connected to the torque converter pressure control valve and the proportional control solenoid valve, and the lockup switch_tocone pressure line is connected to the lockup switch valve, and the lockup switch_tocone pressure line is formed by the hydraulic pressure of the proportional control solenoid valve. The hydraulically actuated hydraulic control circuit is characterized in that the lockup switch valve land is moved to release the lockup switch_tocon control line. The method of claim 1, wherein the lock-up switch valve is connected to the branch line of the torque converter supply line for supplying the torque converter supply hydraulic pressure, the branch line forms a connection structure with the cooling / lubrication line connected to the torque converter discharge line And the connection structure is provided with an orifice.
The hydraulic control circuit of claim 4, wherein the lock-up switch valve shuts off the branch line by land movement when the damper is turned off so that the torque converter supply hydraulic pressure is not filled in the cooling / lubricating line.
[5] The hydraulic control circuit of claim 4, wherein the torque converter control valve is connected to the torque converter pressure control valve by a token pressure control line.

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