KR20120051241A

KR20120051241A - Hydraulic circuit for continuous variable transmission

Info

Publication number: KR20120051241A
Application number: KR1020100112582A
Authority: KR
Inventors: 김현석
Original assignee: 현대자동차주식회사
Priority date: 2010-11-12
Filing date: 2010-11-12
Publication date: 2012-05-22
Also published as: KR101619543B1

Abstract

The present invention comprises a high stage clutch (1) to receive the hydraulic pressure to implement a high stage; A low stage brake 3 capable of receiving a hydraulic pressure to implement a low stage; A manual valve (5) configured to receive the clutch pressure and be operated by the shift lever operation of the driver to form the D stage pressure and the L stage pressure; A direct control solenoid valve (7) which directly receives the clutch pressure and directly forms a clutch control pressure for controlling the high stage clutch (1) or the low stage brake (3) and supplies it to the manual valve (5); The valve spool is moved only when the driven pulley control pressure and the driving pulley control pressure are at the same time and the L stage pressure from the manual valve 5 is supplied so that the clutch control pressure from the manual valve 5 is increased. 1) including a switch valve (9) configured to switch from the state supplied to the low-speed brake (3) to the state supplied to the stepless transmission, in the event of a failure of the controller controlling the continuously variable transmission By shifting the vehicle to high and low speeds, the vehicle can run smoothly even when there is an uphill road in response to a malfunction of the vehicle. Thus, the vehicle's ability to cope with an emergency situation can be further improved to improve the safety of the vehicle. Make sure

Description

Continuous Circuit for Continuous Variable Transmission

The present invention relates to a continuously variable transmission hydraulic circuit, and more particularly, to a technique for enabling a high-speed drive and a low-speed drive to operate an uphill road in the event of a failure of a transmission control unit (TCU).

The continuously variable transmission enables continuously shifting the entire speed range from the low speed ratio required for driving the vehicle to the high speed ratio, thereby improving fuel efficiency by controlling the optimum speed ratio according to the driving situation of the vehicle.

Therefore, a vehicle equipped with a continuously variable transmission as described above is generally capable of selecting only a D range as a forward traveling shift stage, and all transmission ratios are implemented by operating the continuously variable transmission in accordance with the driving situation of the vehicle in the TCU. .

In a situation in which a TCU breakdown occurs in a vehicle equipped with a continuously variable transmission as described above, it is difficult to properly control the transmission ratio according to the driving situation of the vehicle. I can move it.

However, as described above, when the continuously variable transmission is fixed at one speed ratio due to a failure of the TCU, when the road on which the vehicle is to be driven is an uphill road, torque for driving the vehicle from the driving wheel is insufficient, so that the vehicle cannot be driven. Disapproval may occur.

According to the present invention, when the controller controlling the continuously variable transmission fails, the continuously variable transmission can be shifted to the high and low stages only by operating the shift lever of the driver, so that the vehicle can be smoothly driven even when there is an uphill road in response to a failure of the vehicle. It is an object of the present invention to provide a continuously variable transmission hydraulic circuit capable of further improving the vehicle safety by further improving the vehicle's ability to cope with an emergency.

The present invention continuously variable transmission hydraulic circuit for achieving the object as described above

A high stage clutch for receiving a hydraulic pressure to implement a high stage;

Low stage brake to receive the hydraulic pressure to implement the low stage;

A manual valve configured to receive a clutch pressure and be operated by a shift lever operation of a driver to form a D stage pressure and an L stage pressure;

A direct control solenoid valve configured to directly supply a clutch control pressure to receive the clutch pressure and to control the high stage clutch or the low stage brake;

The valve stage is moved only when the driven pulley control pressure and the driving pulley control pressure are at the same time and the L stage pressure is supplied from the manual valve so that the clutch stage is supplied from the manual valve to the high stage clutch. A switch valve configured to be switched to a state supplied to the brake;

Characterized in that configured to include.

According to the present invention, when the controller controlling the continuously variable transmission fails, the continuously variable transmission can be shifted to the high and low stages only by operating the shift lever of the driver, so that the vehicle can be smoothly driven even when there is an uphill road in response to a failure of the vehicle. In addition, the vehicle's safety can be improved by further improving its ability to cope with emergencies.

1 is a view illustrating a continuously variable transmission hydraulic circuit according to the present invention.
Figure 2 shows a continuously variable transmission hydraulic circuit according to the present invention, a diagram illustrating a D stage driving situation when the TCU failure,
3 is a view illustrating a continuously variable transmission hydraulic circuit according to the present invention and illustrating an L stage driving situation when a TCU breaks down.

1 to 3, the embodiment of the present invention is a high stage clutch (1) to be implemented by the hydraulic pressure supplied to; A low stage brake 3 capable of receiving a hydraulic pressure to implement a low stage; A manual valve (5) configured to receive the clutch pressure and be operated by the shift lever operation of the driver to form the D stage pressure and the L stage pressure; A direct control solenoid valve (7) which directly receives the clutch pressure and directly forms a clutch control pressure for controlling the high stage clutch (1) or the low stage brake (3) and supplies it to the manual valve (5); The valve spool is moved only when the driven pulley control pressure and the driving pulley control pressure are at the same time and the L stage pressure from the manual valve 5 is supplied so that the clutch control pressure from the manual valve 5 is increased. And a switch valve 9 configured to switch from being supplied to 1) to being supplied to the low stage brake 3.

That is, as shown in the switch valve 9, the driving pulley control pressure and the driven pulley control pressure on the left side are configured to act on the valve spool 11, and L stage pressure from the manual valve 5 is also added. The solenoid supply pressure is supplied while the opposite side is supported by the spring 13, so that the valve spool 11 is provided only when the driving pulley control pressure, driven pulley control pressure, and L-stage pressure act at the same time. You can move to the right.

Here, the drive pulley control pressure and the driven pulley control pressure do not occur at the same time as the maximum pressure during normal operation. In other words, both of these pressures are at maximum pressure only if the TCU fails. Therefore, the valve spool 11 of the switch valve 9 moves to the right from the state in which the valve spool 11 is in close contact with the left side only when the driver selects the shift lever as the L range while the TCU is broken.

In addition, the embodiment of the present invention is further provided with a brake control solenoid valve 15 for receiving the D-stage pressure from the manual valve (5) to form a brake control pressure for controlling the low stage brake (3), the switch The valve 9 receives the brake control pressure and supplies the brake control pressure to the low stage brake 3 while the driven pulley control pressure, the drive pulley control pressure, and the L step pressure do not act. When both the pulley control pressure and the L stage pressure act, the brake control pressure is interrupted and the clutch control pressure is supplied to the low stage brake 3.

The manual valve (5) is configured to form only the D stage pressure when the D stage is selected, and simultaneously form the D stage pressure and the L stage pressure when the L stage is selected, and the direct control solenoid valve when the D stage is selected and the L stage is selected. It is configured to receive the clutch control pressure from (7) and transmit it to the switch valve (9).

In addition, the embodiment of the present invention further includes a reverse brake 17 for reverse shifting, and the manual valve 5 receives the clutch control pressure from the direct control solenoid valve 7 when the R stage is selected. It is formed to transmit to the brake 17.

That is, the manual valve 5 receives the clutch control pressure from the direct control solenoid valve 7 and supplies the switch valve 9 to the switch valve 9 at the D and L stages, and the reverse brake 17 at the R stage. It is configured to pass to

On the other hand, the direct control solenoid valve 7 is configured of a normally high type (Normally High Type) that outputs the maximum pressure when the power is cut off.

Looking at the operation of the present invention configured as described above are as follows.

1 illustrates a situation in which a vehicle equipped with a continuously variable transmission hydraulic circuit of an embodiment of the present invention performs normal driving. The manual valve 5 selects the D stage, but substantially the same in the L stage. .

The clutch control pressure from the direct control solenoid valve 7 is supplied to the high stage clutch 1 via the manual valve 5 and the switch valve 9 to directly control the high stage clutch 1. .

At this time, since the valve spool 11 of the switch valve 9 is in a normal driving situation, the valve spool 11 is in close contact with the left side of the switch valve 9. The brake control solenoid receives the D stage pressure from the manual valve 5 and controls the low stage brake 3. Unlike the drawings, the valve 15 is controlled so as not to form a pressure for controlling the low stage brake 3, so that only the high stage clutch 1 is controlled to implement a high stage shift stage.

On the other hand, the brake control solenoid valve 15 receives the D step pressure from the manual valve 5 to form a control pressure for controlling the low stage brake 3 and the low stage brake through the switch valve 9. By supplying and controlling to (3), a low gear shift stage is implemented.

Of course, in this case, the direct control solenoid valve 7 releases the clutch control pressure supplied to the high stage clutch 1 so that only the low stage brake 3 is operated.

2 illustrates a case in which the shift lever selects the D stage in a state in which the TCU has failed, and both the driven pulley control pressure and the driving pulley control pressure are supplied to the switch valve 9 due to the failure of the TCU. The manual valve 5 generates only the D stage pressure, so that the valve spool 11 of the switch valve 9 remains in close contact with the left side.

The direct control solenoid valve (7) outputs the maximum pressure in a normally high type, and this pressure is fastened through the manual valve (5) and the switch valve (9) by tightening the high stage clutch (1). The state of stage D is maintained.

3 is a case where the driver moves the shift lever to the L stage in a situation where the TCU is broken, and is selected in a situation in which the vehicle must travel uphill.

The manual valve (5) forms a D stage pressure in the L stage and supplies the brake control solenoid valve (15), but the brake control solenoid valve (15) is a normally low type (NORMALLY LOW TYPE), which makes it difficult to operate normally. In this situation, since the L-stage pressure generated by the manual valve 5 acts on the switch valve 9 together with the driving pulley control pressure and the driven pulley control pressure, the valve spool 11 of the switch valve 9 is right. The hydraulic pressure from the direct control solenoid valve 7 is supplied to the low stage brake 3 via the manual valve 5 and the switch valve 9.

Accordingly, the L-speed shift stage can be formed even when the TCU breaks down by the shift lever operation of the driver, so that the vehicle can be driven even under driving conditions such as a slope.

One; High Clutch
3; Low brake
5; Manual Valve
7; Direct Control Solenoid Valve
9; Switch valve
11; Valve spool
13; spring
15; Brake Control Solenoid Valve
17; Reverse brake

Claims

A high stage clutch for receiving a hydraulic pressure to implement a high stage;
Low stage brake to receive the hydraulic pressure to implement the low stage;
A manual valve configured to receive a clutch pressure and be operated by a shift lever operation of a driver to form a D stage pressure and an L stage pressure;
A direct control solenoid valve configured to directly supply a clutch control pressure to receive the clutch pressure and to control the high stage clutch or the low stage brake;
The valve stage is moved only when the driven pulley control pressure and the driving pulley control pressure are at the same time and the L stage pressure is supplied from the manual valve so that the clutch stage is supplied from the manual valve to the high stage clutch. A switch valve configured to be switched to a state supplied to the brake;
Continuously variable transmission hydraulic circuit comprising a.

The method according to claim 1,
A brake control solenoid valve configured to receive a D stage pressure from the manual valve to form a brake control pressure for controlling the low stage brake;
It is configured to include more
The switch valve receives the brake control pressure and supplies it to the low stage brake while none of the driven pulley control pressure, drive pulley control pressure, and L stage pressure is applied, and the driven pulley control pressure, drive pulley control pressure, Configured to shut off the brake control pressure and supply the clutch control pressure to the low stage brake when both L stage pressures are applied;
CVT hydraulic circuit, characterized in that.

The method of claim 2, wherein the manual valve
When the D stage is selected, only the D stage pressure is formed, and when the L stage is selected, the D stage pressure and the L stage pressure are simultaneously formed;
Configured to receive clutch control pressure from the direct control solenoid valve and transfer it to the switch valve when selecting stage D and selecting stage L
CVT hydraulic circuit, characterized in that.

The method according to claim 3,
A reverse brake for reverse shift is further provided;
The manual valve is configured to receive the clutch control pressure from the direct control solenoid valve and deliver it to the reverse brake when the R stage is selected.
CVT hydraulic circuit, characterized in that.

The method of claim 4,
The direct control solenoid valve is of a normally high type that outputs a maximum pressure when the power is cut off.
CVT hydraulic circuit, characterized in that.