KR101405004B1 - Controlling apparatus for dual clutch - Google Patents

Abstract

The present invention makes it possible to control the DCT by using one electric pump so that the hydraulic pressure is only required when the hydraulic pressure is required, and at the same time, the generated pressure is not drained, And it is an object of the present invention to provide a control apparatus for a dual clutch transmission capable of improving the efficiency by lowering consumption power to be used.
Particularly, the present invention provides a control device for a dual clutch transmission in which a configuration of the entire circuit can be compactly used by applying an inexpensive and simple spool valve as a valve for operating the transmission actuator, .
In addition, the present invention provides an accumulator capable of maximizing the efficiency by minimizing the load applied to the hydraulic pump and using the filled hydraulic pressure when necessary, by accumulating and using unused oil pressure, Another object is to provide a control device for a clutch transmission.

Description

[0001] CONTROLLING APPARATUS FOR DUAL CLUTCH [0002]

The present invention relates to a control apparatus for a dual clutch transmission, and more particularly, to a control apparatus for a dual clutch transmission, and more particularly to a control apparatus for a dual clutch transmission, It is a control device for dual clutch transmission that can reduce the power to increase the efficiency, minimize the amount of hydraulic drain generated once, increase its efficiency, and can also reduce the cost and structure by applying spool valve. .

Generally, the dual clutch transmission is provided with two shift clutches, so that the shifting of the even-numbered gears and the odd-numbered gears can be achieved for each of the shifting clutches. These dual-clutch transmissions are fast-moving and smooth, so more and more vehicles are on the way.

Patent Document 1 discloses a method and a control system for controlling the hydraulic pressure of such a dual clutch transmission (DCT). (HPS) for providing oil to the actuators (ACT) of the DCT; providing oil to the lubrication and cooling system (LCS) of the DCT; A low pressure section (LPS); And adjuster means (030) for sending excess oil from said high pressure portion (HPS) to said lubrication and cooling system (LCS) and maintaining the pressure at said high pressure portion (HPS) constant; And a hydraulic control means, wherein the pump means (020) is a fixed displacement double action pump comprising a first pressure outlet (X) and a second pressure outlet (Y)

The hydraulic control means includes: (LPS) between the pump means 020 and the lubrication and cooling system LCS is connected to the branch line 060L of the low pressure portion LPS which is connected to the high pressure portion HPS A directional valve (050) controlled by an on / off valve (040) formed between the check valve (060) formed; A 2/2-way valve (051) for connecting the second pressure outlet (Y) linked to the low pressure portion (LPS) to the suction side (SS) of the pump means (020); (HPS) main line (ML) branching from the main line (ML) at a first branch point (P1) between the pump means (020) and the actuators (ACT) A proportional pressure relief valve (030) formed in the first branch line (030L) And a proportional pressure reducing valve (080) formed in a second branch line (080L) of a main line (ML) of the high pressure portion (HPS) and communicating with the proportional pressure relief valve (030) by a first feedback line (FBL1) .

However, such a conventional control method has the following problems.

1) Normally, in case of wet DCT, since a large amount of flow is required, a continuously driven oil pump is used, and therefore, a large amount of power is required for driving the pump.

2) Not only the structure is complicated, but also a large number of spool valves are required for hydraulic control to each control element.

3) Especially, the spool valve used for the pressure control consumes a large amount of the flow rate required for the DCT control device because it requires a lot of oil in the control of the hydraulic pressure, and as a result, the control device itself becomes large in size.

4) It is necessary to secure a sufficient amount of flow formed by the always-driven pump and unnecessary drain amount of the flow having the energy in the function of the spool valve is increased, thereby acting as a factor to lower the efficiency of the vehicle.

Korean Patent Laid-Open No. 10-2008-0007530 (2008.01.22)

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a control apparatus and a control method thereof, capable of controlling a DCT using an electric pump so as to operate only when oil pressure is required, And it is an object of the present invention to provide a control device for a dual clutch transmission that can improve the efficiency by lowering consumption power to be used in comparison with a mechanical pump of an always-driven type.

Particularly, the present invention provides a control device for a dual clutch transmission in which a configuration of the entire circuit can be compactly used by applying an inexpensive and simple spool valve as a valve for operating the transmission actuator, .

In addition, the present invention provides an accumulator capable of maximizing the efficiency by minimizing the load applied to the hydraulic pump and using the filled hydraulic pressure when necessary, by accumulating and using unused oil pressure, Another object is to provide a control device for a clutch transmission.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a control apparatus for a dual clutch transmission, comprising: an electric oil pump for storing oil pressure generated by a predetermined pressure from an oil pan in an accumulator provided with a check valve; A pressure maintaining valve connected to the output side of the accumulator to keep the pressure generated from the accumulator from being drained; At least one clutch control valve for branching the oil pressure from the pressure holding valve to control the clutch of the dual clutch; A pressure holding valve for supplying lubricating oil required by the dual clutch to the oil pressure applied from the pressure holding valve and maintaining a shifting state necessary for shifting; At least one pressure regulating valve for receiving an oil pressure from the pressure holding valve; At least one flow control valve for receiving an oil pressure from the pressure holding valve; And at least a pair of spool valves for sequentially controlling the pressure control valve and the actuator for shifting by receiving the hydraulic pressure branched from the flow control valve.

In particular, the electric oil pump is an internal gear or an external gear type oil pump, and is driven by a BLDC motor. The electric oil pump is selectively driven (ON-Demand) only when constant driving or axial pressure is required.

Further, the clutch control valve is provided with a residual pressure valve. Further, a fail-safe valve is further provided between the clutch control valve and the dual clutch so as to prevent the clutch from being operated when the clutch fails.

In addition, the flow rate control valve is provided with a pair of valves, and the bidirectional flow rate control can be independently performed.

Further, the pressure holding valve is operable to supply the necessary lubricating oil in cooperation with the clutch control valve. The pressure holding valve 40 is further provided with a cooler for cooling the supplied oil.

Also, a built-in strainer and a bypass pipe are provided in parallel between the electric oil pump and the accumulator.

The backflow prevention valve may further include: a body having an inlet side and an outlet side; A ball moving within the body; And a bypass pipe formed between the outlet side and the body.

Further, modified examples of the check valve include a body having an inlet side and an outlet side; A valve body sliding inside the body and communicating the inlet side and the outlet side through a flow path formed therein; And a bypass pipe formed between the outlet side and the body.

The accumulator may be a spring type accumulator or a gas accumulator.

Finally, in the dual clutch according to the present invention, the dual clutch (DC) is a dual clutch for wet or dry dual clutch transmission.

According to the control apparatus for dual clutch transmission of the present invention, the following effects can be obtained.

1) By applying the spool valve to drive the actuator, the circuit configuration can be made compact and the cost can be reduced.

2) By using only one electric pump, it is possible to selectively drive (ON-demand) only when necessary axial pressure is required to obtain necessary power and oil pressure for lubrication. .

3) By using the oil pressure generated from the oil pump by accumulating pressure in the accumulator, it is possible to continuously use the generated oil pressure, thereby improving the operating efficiency of the system.

4) By applying a pressure holding valve for line pressure control, the hydraulic pressure to be drained unnecessarily is minimized, and the flow rate supplied from the hydraulic pump can be minimized. At this time, the pressure holding valve is able to be controlled even when the flow rate from the input side port to the output side and the control side port does not have a flow rate to be drained during the pressure control.

5) By applying a pressure holding valve as a control valve for controlling the pressure required for lubrication, it is possible to control unnecessary flow loss because control is possible without a flow rate to be drained during pressure control for reducing pressure.

6) By simplifying the construction of the hydraulic circuit, it is possible to reduce the occurrence factor of the abnormality as well as to keep track of the abnormality even when the abnormality occurs, so that maintenance is easy.

1 is a hydraulic circuit diagram showing a flow of hydraulic pressure for explaining a configuration of a control apparatus for dual clutch transmission according to the present invention.
2 is a schematic view schematically showing a configuration of a check valve according to the present invention.
3 is a schematic view schematically showing a configuration of a modified example of the check valve according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

<Configuration>

FIG. 1 is a hydraulic circuit diagram showing the flow of hydraulic pressure for explaining a configuration of a control device for dual clutch transmission according to the present invention. FIG. 2 is a schematic view schematically showing a configuration of a check valve according to the present invention. And FIG. 3 is a schematic view schematically showing a configuration of a modified example of the check valve according to the present invention

The control device according to the present invention includes an electric oil pump 10 for generating oil, a pressure maintaining valve 20 for maintaining pressure so that the generated oil can be continuously used without draining, and a dual clutch DC At least one pressure control valve (50a, 50b) for substantially controlling the clutch control valves (30a, 30b), the pressure holding valve (40) for lubricating action, the actuators (G1, G2, G3, G4) One flow control valve 60a, 60b and a pair of spool valves 90a, 90b.

In particular, the control device according to the present invention makes it possible to continuously utilize the oil pressure generated once without being drained to the oil pan, thereby improving the operating efficiency as well as the driving efficiency.

The control device according to the present invention can operate the actuators G1, G2, G3 and G4 by using the spool valves 90a and 90b, thereby simplifying the structure and reducing cost.

Hereinafter, this configuration will be described in more detail as follows.

The electric oil pump 10 functions to generate oil pressure required from the oil pan OP to the entire controller.

It is preferable that the electric oil pump 10 uses a gear type, for example, an internal gear or an external gear type oil pump so as to minimize drive control and leakage of oil during pressure generation. Needless to say, such an electric oil pump requires an electric motor or the like for driving. In the present invention, the BLDC motor 11 is used as the electric motor. The control of such an electric motor may be separately provided or may be controlled using a TCU or an MCU already mounted on the vehicle.

On the other hand, in the preferred embodiment of the present invention, the oil pressure generated from the electric oil pump 10 is stored in the accumulator 12. The accumulator 12 stores the oil pressure formed from the electric oil pump 10 and supplies the oil pressure at a constant pressure, thereby increasing the efficiency of the accumulation and increasing the power density.

In the preferred embodiment of the present invention, the accumulator 12 may use a gas such as nitrogen gas to vary the accumulation capacity so as to supply the required flow rate in the system in a short period of time, or when the space constituting the system is sufficient A spring type accumulator may be applied.

A built-in strainer 13 and a bypass pipe 14 are provided in parallel between the electric oil pump 10 and the oil pan OP. The built-in strainer 13 functions to filter foreign matters contained in the oil outputted from the electric oil pump 10 so that other constituent elements are not limited in operation due to foreign matter being stuck. When the built-in strainer 13 is clogged by a foreign substance or the like, the bypass pipe 14 functions as a bypass, thereby allowing the flow rate of the built-in strainer 13 to be supplied even if the built-in strainer 13 is clogged.

A check valve (15) is provided on the output side of the accumulator (12). The backflow prevention valve 15 supplies the oil pressure to the system from the accumulator 12. The oil pressure supplied to the system prevents the oil pressure from flowing back to the oil pan OP, The minimum oil pressure required for operation also enables control operation. This reverse flow prevention function also improves the operation reaction speed since the pressure of the accumulator 12 can be used immediately in the next operation.

On the other hand, the backflow prevention valve 15 may be a ball type as an embodiment. 2, the backflow prevention valve 15 includes a body 15a having an inlet side for receiving hydraulic pressure from the accumulator 12 side and an outlet side for supplying hydraulic pressure to the system side, And a ball 15b which moves in accordance with the hydraulic pressure difference between both sides of the oil pressure difference. The backflow prevention valve 15 further includes a bypass pipe 15c between the outlet side and the body 15a so that the hydraulic pressure distribution can be adjusted so that the ball 15b can move more smoothly by the hydraulic pressure difference. .

Also, the check valve 15 may be a valve 70 of a valve body 72 type to be slid. 3, the valve 70 includes a body 71 having an inlet side and an outlet side for supplying hydraulic pressure. Particularly, the inlet side and the outlet side are perpendicular to the longitudinal direction of the body 71 And is formed at both ends thereof. The body 71 is provided with a valve body 72 having a flow path 72a. Further, the body 71 is provided with a bypass pipe 73 between it and the outlet side. The valve body 72 is moved along the body 71 and selectively communicates the inlet side and the outlet side by the flow path 72a. 3, (a) and (b) show the state before and after the operation of the valve 70 for preventing the backflow, respectively.

Of course, a conventional ball type check valve may be used in the present invention.

The electric oil pump 10 may be controlled so as to constantly generate the oil pressure required for shifting through the constant drive system. However, it is preferable that the electric oil pump 10 may accumulate a predetermined pressure in the accumulator 12, Therefore, it is preferable to control by the ON-demand method which selectively drives only when necessary.

The pressure maintaining valve (20) is mounted on the output side of the accumulator (12). The pressure maintaining valve 20 is configured to allow the oil pressure supplied from the accumulator 12 to the control circuit side to maintain a predetermined pressure state and prevent the supplied oil pressure from being drained so that the driving time of the electric oil pump 10 .

The clutch control valves 30a and 30b are control valves for controlling the dual clutches DC. These clutch control valves 30a and 30b are respectively used to control the dual clutch DC by branching off the oil pressure generated from the pressure holding valve 20. [

Here, the dual clutch (DC) according to the present invention can be applied not only to a wet type but also to a dual clutch for dry dual clutch transmission.

The clutch control valves 30a and 30b control the clutches K1 and K2 of the dual clutches DC so that the control valves can be controlled independently so that any one of them can not be used It is desirable to make some available.

It is preferable that each of the clutch control valves 30a and 30b is provided with a residual pressure valve (not shown) so that the residual pressure remaining after the control operation is eliminated so that the next control operation can be performed more accurately .

Finally, it is preferable that a fail-safe valve 31 is additionally provided between the clutch control valves 30a and 30b and the dual clutch DC. The fail-safe valve 31 acts as a safety device for shutting off the control pressure so that the number of gear teeth is not engaged when an abnormality occurs in the clutches K1 and K2 of the dual clutches DC. The fail-safe valve 31 is controlled by the pressure-holding valve 40, which will be described later, to shut off the control pressure.

The pressure holding valve 40 maintains the hydraulic pressure required to control the actuators G1, G2, G3 and G4 through the pressure control valves 50a and 50b to be described later. That is, the pressure holding valve 40 supplies the hydraulic pressure required for shifting during the shifting operation and keeps the hydraulic pressure state, thereby preventing the shifting from being arbitrarily changed.

The pressure holding valve 40 also serves to supply the necessary oil as lubricant in the dual clutch transmission. Particularly, when the oil is supplied as lubricating oil, the temperature of the oil may increase due to frequent operation or the like. In this case, the cooler 41 is further provided so as to cool the oil.

The pressure holding valve (40) also controls the fail safe valve (31) as described above.

The pressure control valves 50a and 50b branch the oil pressure applied from the pressure holding valve 20 and control the actuators G1, G2, G3 and G4 through the spool valves 90a and 90b to be described later .

At least one of the pressure regulating valves 50a and 50b may be used according to the number of DCT transmission steps. In a preferred embodiment of the present invention, two pressure regulating valves 50a and 50b can be sequentially controlled.

The flow control valves 60a and 60b are used to control the spool valves 90a and 90b together with the pressure control valves 50a and 50b using the hydraulic pressure applied from the pressure holding valve 40. [

Particularly, since these flow control valves 60a and 60b use valves capable of bidirectional flow control because the actuators G1, G2, G3 and G4 interact with each other, these actuators G1, G2, G3, It is preferable to be able to cope with the interaction performed by the user.

The spool valves 90a and 90b are valves for controlling the actuators G1, G2, G3 and G4, which perform a substantially shift operation in the dual clutch transmission. The spool valves 90a and 90b may leak hydraulic pressure, but the structure is simple and inexpensive.

Particularly, the spool valves 90a and 90b are supplied with the hydraulic pressure required for shifting by the pressure control valves 50a and 50b and the flow control valves 60a and 60b. At this time, .

In the control device according to the present invention, the oil pressure generated through one electric oil pump is accumulated through the accumulator and branched to a control valve requiring pressure, and in particular, the pressure holding valve The lubricating action required by the double clutch can be achieved.

Therefore, it is possible to supply both the control pressure and the lubricating oil using a single electric oil pump while the structure is simple.

In addition, by adopting a spool valve instead of an expensive solenoid valve, the structure can be simplified and the cost can be reduced.

10: Electric oil pump
11: BLDC motor
12: Accumulator
15: Backflow prevention valve
20: Pressure maintaining valve
30a, 30b: clutch control valve
40: Pressure holding valve
50a, 50b: pressure regulating valve
60a, 60b: Flow control valve
90a, 90b: spool valve

Claims (14)

An electric oil pump 10 for storing the oil pressure generated by the predetermined pressure from the oil pan OP in the accumulator 12 provided with the check valve 15;
A pressure maintaining valve (20) connected to the output side of the accumulator (12) to keep the pressure generated from the accumulator (12) from being drained;
Two clutch control valves 30a and 30b for branching the oil pressure from the pressure holding valve 20 to control the clutches K1 and K2 of the dual clutches DC;
A pressure holding valve (40) for supplying lubricating oil required by the dual clutch (DC) to the oil pressure applied from the pressure holding valve (20) and maintaining a shifting state required for shifting;
Two pressure regulating valves (50a, 50b) receiving oil pressure from the pressure maintaining valve (20);
Two flow control valves 60a and 60b receiving oil pressure from the pressure holding valve 40; And
A pair of spool valves 90a and 90b for sequentially controlling the actuators G1, G2, G3 and G4 for receiving the hydraulic pressure branched from the pressure control valves 50a and 50b and the flow control valves 60a and 60b, 90b) for controlling the transmission of the dual clutch transmission.
The method according to claim 1,
Wherein the electric oil pump (10) is an internal gear or an external gear type oil pump, and is driven by a BLDC motor (11).
3. The method of claim 2,
Wherein the electric oil pump (10) is selectively driven (ON-Demand) only when driving or axial pressure is required at all times.
delete delete The method according to claim 1,
And a pair of the flow control valves (60a, 60b) is provided.
The method according to claim 6,
Wherein the flow control valves (60a, 60b) are independently bi-directional flow controllable.
The method according to claim 1,
Wherein the pressure holding valve (40) is connected to the clutch control valves (30a, 30b) to supply the necessary lubricating oil.
9. The method of claim 8,
Further comprising a cooler (41) for cooling the oil supplied from the pressure holding valve (40).
The method according to claim 1,
Wherein a built-in strainer (13) and a bypass pipe (14) are provided in parallel between the electric oil pump (10) and the accumulator (12).
The method according to claim 1,
The check valve (15)
A body (15a) having an inlet side and an outlet side;
A ball 15b moving within the body 15a; And
And a bypass pipe (15c) formed between the outlet side and the body (15a).
The method according to claim 1,
The check valve (15)
A body (71) having an inlet side and an outlet side;
A valve body 72 which slides inside the body 71 and communicates the inlet side and the outlet side through a flow path 72a formed therein; And
And a bypass pipe (73) formed between the outlet side and the body (71).
The method according to claim 1,
Wherein the accumulator (12) is a spring-type accumulator or a gas accumulator.
The method according to claim 1,
Wherein the dual clutch (DC) is a dual clutch for wet or dry dual clutch transmission.

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