KR20200062744A - Oil pressure control system for a vehicle with an auto transmission and an auto transmission - Google Patents

Abstract

The present invention relates to a hydraulic pressure control system for an automatic transmission vehicle, which supplies oil to an operating element for a gear shift by controlling a solenoid valve according to an applied hydraulic pressure, transfers power from an engine to a torque converter, and dualizes the supply of oil to the operating element and the torque converter by a mechanical oil pump. According to the present invention, loss of hydraulic pressure can be reduced by classifying and supplying a flow rate required for the hydraulic system for controlling an automatic transmission.

Description

Automatic Transmission Vehicle's hydraulic control system and automatic transmission {OIL PRESSURE CONTROL SYSTEM FOR A VEHICLE WITH AN AUTO TRANSMISSION AND AN AUTO TRANSMISSION}

The present invention relates to a system for controlling oil hydraulic pressure of a vehicle equipped with an automatic transmission and an automatic transmission including the same.

The automatic transmission is a device that transmits the power generated by the engine and automatically shifts gears for the convenience of the driver. About 90% to 95% of domestic cars are equipped with automatic transmissions.

The automatic transmission is composed of a torque converter that serves to transmit power generated from the engine to the gear, a friction clutch that serves to transmit power generated from the torque converter to the gear, and a planetary gear.

The shifting clutch transmits power to the gear by repeating the clutch disk and the clutch plate that make up the friction clutch, and then dropping, which causes the engine rpm to rise and the friction clutch to be operated automatically by the hydraulic system when the shifting point starts.

1 schematically shows a hydraulic control system for controlling a general automatic transmission, by supplying oil as an operating element for clutch operation by controlling a solenoid valve (Solenoid V/V), and also a torque converter (T/CON). And oil for lubrication.

Oil is supplied from the oil pan to a hydraulic system by a mechanical pump (MOP), and also supplies oil necessary for lubrication.

In this case, when the vehicle and the engine are driven at low rpm, there is a problem of insufficient flow rate, resulting in a decrease in the hydraulic pressure required for the system. The problem arises. Then, the length of the electric field may be increased due to the space in which the pump is applied on the automatic transmission layout.

In addition, when the hydraulic pressure is insufficient, a decrease in line pressure and a shifting problem may occur during shifting.

In addition, although the line pressure (typically 16 bar or 20 bar) required in the hydraulic system is produced, the pressure required for the torque converter and lubrication is lower than this, so the pressure loss increases.

That is, at high rpm, a large amount of generated flow must be discarded, resulting in torque loss, and generated unnecessary flow due to high rotation under pressure load causes pressure rise and torque loss, which is disadvantageous in terms of transmission and vehicle efficiency. Works.

In recent years, the ISG (Idle Stop & Go) function has been added to replace the mechanical pump and line pressure flow path with a separate auxiliary electric pump (EOP) or an auxiliary electric pump, HIS (Hydraulic Impulse Storage) and ISG accumulator. It tends to be applied and responsible for ISG functions.

On the other hand, Figure 2 is an actual hydraulic circuit diagram for controlling an 8-speed automatic transmission consisting of four clutches and two brakes.

A total of 6 operating elements are applied, and one indirect control solenoid (Sol) valve is applied for line pressure and torque converter (T/Con) control, and one OnOff solenoid valve is applied for other fail/safe functions. It shows the hydraulic control system of the SBC (Shift by Cable) type automatic transmission.

In addition, when D->N control, a DN accumulator for normal control was applied together with a check valve to secure static control. In addition, a 2-way torque converter and 1 mechanical constant-acting pump were applied to increase the hydraulic system. Consists of.

However, a typical MOP has one outlet, and the outlet flow is connected to a regulator valve that controls the system pressure and receives a high-pressure system pressure load at the entire flow.

Since the pressure required for the hydraulic control system requires more low pressure from the T/Con side than the high-pressure shifting line pressure, the pump load is subjected to a high pressure load regardless of the T/Con side and the low pressure load of the lubricating flow. do.

Manual valve for SBC dead pressure?? Due to the pressure drop in the static area due to the operation, a problem arises in the speed control in the static control section, so a static address (DN address) is required.

In addition, among the fail safe functions, the length of the fail safe valve applied for the interlock prevention function is long, and there is a problem in that the possibility of sticking valves increases due to the shape of a stopper plug.

The above description of the background art is for helping understanding of the background of the invention, and may include matters other than the prior art already known to those skilled in the art to which this technology belongs.

Korean Registered Patent Publication No. 10-0588509

The present invention has been devised to solve the above-mentioned problems, and the present invention provides a hydraulic control system and an automatic transmission that can reduce the loss of hydraulic pressure by classifying and supplying the necessary flow rate for a hydraulic system for automatic transmission control. It has its purpose.

The hydraulic control system of the automatic transmission vehicle according to one aspect of the present invention supplies oil to an operating element for gear shifting by controlling a solenoid valve according to the applied hydraulic pressure, and transmits power from the engine to a torque converter. It characterized in that the supply of oil to the operating element and the torque converter by the mechanical oil pump of the binary.

Furthermore, the mechanical oil pump is characterized in that it is a binary vane pump having two inlets and two outlets.

In addition, the mechanical oil pump supplies oil at a high pressure through a discharge port on the operating element side connected to the operating element among the two discharge ports, and operates through a torque converter side discharge port connected to the torque converter side of the two discharge ports. It is characterized by supplying oil at a relatively low pressure compared to the urea-side discharge port.

On the other hand, a flow path to which the outlet of the operating element side of the mechanical oil pump is connected is connected to a regulator valve for controlling line pressure, and a flow path to which the outlet of the mechanical oil pump is connected to the outlet side of the torque converter is the torque converter. It is characterized by supplying oil necessary for pressure and lubrication.

In addition, the orifice may be further provided between a flow path connected to the discharge port on the side of the operating element and a flow path connected to the discharge port on the side of the torque converter.

And, it may further include an ISG (Idle Stop & GO) function and an auxiliary electric pump to assist the lubricant flow at low rpm.

In addition, the automatic transmission of the present invention is configured to include the hydraulic control system.

According to the hydraulic control system of the automatic transmission vehicle of the present invention and the automatic transmission including the same, it is possible to minimize the pump drive torque loss by separately supplying the operating element side hydraulic pressure and the torque converter side hydraulic pressure.

In addition, it improves static control performance, including oscillation performance through the elimination of static words.

In addition, it is possible to contribute to material cost reduction and structural simplification through the reduction of components, and failure diagnosis can also be attenuated by applying a simplified hydraulic circuit diagram.

1 schematically shows a conventional hydraulic system.
Figure 2 shows an example of an actual circuit diagram of a conventional hydraulic system.
3 shows a circuit diagram of a hydraulic system according to the present invention.
4 schematically shows the hydraulic system of FIG. 3.
5 to 16 show the hydraulic flow according to the shift stage of the hydraulic system of FIG. 3.
17 schematically shows a hydraulic system according to another embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

In describing preferred embodiments of the present invention, well-known techniques or repetitive descriptions that may unnecessarily obscure the subject matter of the present invention will be reduced or omitted.

3 shows a circuit diagram of the hydraulic system according to the present invention, and FIG. 4 schematically shows the hydraulic system of FIG. 3.

Hereinafter, a hydraulic control system of an automatic transmission vehicle according to an embodiment of the present invention and an automatic transmission including the same will be described with reference to FIGS. 3 and 4.

The hydraulic control system for an automatic transmission vehicle according to the present invention is for shift control of an automatic transmission, and is a system for performing gear shift and transmitting power from an engine to a torque converter and a gear unit.

For this, the hydraulic control system applies hydraulic pressure to the operating element by the control of a solenoid valve (Solenoid V/V) by an electronic control unit (ECU) to control the transmission so that shifting can be performed according to the hydraulic pressure. Performs control and lubrication functions.

The oil pump for supplying hydraulic pressure in the hydraulic control system of the present invention may include a mechanical oil pump (MOP) and an auxiliary electric pump (EOP), and the mechanical oil pump is a system by being applied as a binary vane pump having two outlets. It is configured to reduce the pump driving loss by dualizing the pressure.

That is, one of the two outlets is connected to a flow path connected to the operating element side to supply hydraulic pressure to the operating element side, and the other of the two outlets is connected to a flow path connected to the torque converter side to supply hydraulic pressure to the torque converter side. It is configured to supply.

By applying a regulator valve that controls line pressure to the flow path to which the outlet of the operating element is connected, a load is created at a low pressure to the flow path to which the outlet of the torque converter is connected to utilize a plurality of torque converter pressures and lubricants. It constitutes a hydraulic control system for a stable transmission through control of operating elements.

That is, by dividing the pressure required for the system into a line pressure system and a torque converter pressure system, the pump drive torque is 1/3 level by generating a high pressure at the outlet of the operating element side and a relatively low pressure torque converter pressure at the outlet of the torque converter side. Can be reduced to contribute to increased efficiency.

In the example of the city, there are seven operating elements (B1 to B4, C1 to C3), and it is a hydraulic control system for automatic transmission of 10 steps forward and 1 step backward.

Looking at each configuration constituting the hydraulic control system sequentially, the main filter and the oil pan 1 functions as an ATF (Auto Transmission Fluid) foreign material filtering and ATF storage.

The binary vane pump (2) of the present invention is composed of two inlets and two outlets to independently supply flow rates through the two outlets.

In addition, the auxiliary electric pump (EOP, 3) is responsible for the function of assisting the ISG (Idle Stop & GO) and the lubricant flow at low rpm.

A regulator valve (4) connected to one of the two outlets of the binary vane pump (2) supplies the required control pressure to the system.

The indirect control solenoid valves (VFS, 5) are N/H (Normal High) type and are short type linear pressure control solenoid valves.

And, the reducing valve (reducing valve 6) is a pressure reducing valve that generates a pressure supplied to the solenoid valve.

Next, the built-in filter 7 is a high pressure filter for removing foreign substances in the valve body, and may be omitted.

The damping valve 8 functions to relieve pressure instability of the production pressure (Sol supply pressure) of the reducing valve 6.

Further, the torque converter valves TCV and 9 are secondary regulating valves that generate pressure used in the torque converter T/Con.

The indirect control solenoid valves (VFS, 10) on the torque converter side are N/L (Normal Low) type and are indirect control solenoid valves for controlling the damper clutch inside the torque converter.

Then, the TC-PCV valve 11 controls the damper clutch to control DA (damper clutch apply arm) and DR (damper clutch release arm) of the damper clutch during lock up control.

In addition, the lock-up switch valve (Lock-Up SW valve, 12) is a valve for switching the flow path to the torque converter during lock-up control.

And, the torque converter 13 is a 2-way torque converter, and the cooler 14 is for lowering the temperature of the ATF.

Next, the damping valve 15 on the torque converter side is a VFS 10 control pressure stabilization device.

The on-off solenoid valve (OnOff Solenoid valve, 16) is an on-off solenoid valve without linear control and is involved in fail safe and lymph-home functions.

In addition, the direct-acting solenoid (Direct-Acting Solenoid, 17) is a solenoid that does not have a flow path part and controls the rod stroke according to the applied current. It is an N/L type spool valve that directly controls the operating element pressure, and Direct Act PCV (18, 19) is directly connected to the direct acting solenoid (17) to directly control the operating element pressure and reference numeral 17 is N /L type spool valve, and reference numeral 18 is an N/H type spool valve.

Next, the manual valve 20 is a valve in charge of P-R-N-D control by the driver's lever operation, and is in charge of the primary fail safe function.

Then, the residual pressure valve 21 is a valve that maintains the residual pressure in the flow path when the operating element (clutch/brake) is released.

In addition, the lymph home valve R (LHV-R, 22) implements a fail safe function that takes care of the lymph home function when Rev is turned on, and switches the flow path under certain conditions, and the lymph home valve D (LHV-D, 22′) This is a fail-safe valve for applying the D-stage flow pressure when the pressure is released to C2 and C3 when the D-stage fails.

SW-24(23) is responsible for switching the flow path under specific conditions to control B2 and B4 with the same solenoid valve.

Next, the FSV-B3 (24) is a fail-safe valve for releasing the pressure flowing into B3 when failing, and the FSV-N (24') is a fail-safe for releasing the pressure flowing into C1 at the N end when failing. It is a valve.

In addition, the check valve 25 is responsible for a switching function in which the flow path is switched by the pressure flowing into both sides, and an accumulator valve (26) has a damping function to relieve instability of the control pressure applied to the operating element. In charge.

In addition, the check valve-LP 27 functions to prevent reverse flow of pressure formed in the system pressure flow path, and the check ball-LP 28 functions to discharge pressure when forming overpressure by a valve stick or the like when forming system pressure, The check valve-EOP (29) functions as a backflow prevention function to prevent flow loss during EOP operation, and the lubricating oil passage (30) lubricates part of the flow rate from the torque converter and TCV (9) flow rate through the cooler (14). Send it to the place you need.

The hydraulic system according to the present invention is configured as described above, thereby controlling the hydraulic pressure as illustrated in the hydraulic circuit diagrams of FIGS. 5 to 16, thereby controlling seven operating elements to implement R stage, N stage and D1 to D10 stage. .

In addition, in the case of the fail-safe function, a simplified hydraulic circuit diagram is implemented by realizing only the lymph-home function by simplifying as much as possible, and in particular, the fail-safe valve configured when sticking in the N/L state of N/H type PCV and interlocked direct act solenoid or It is implemented to be operated as R stage, N stage, and D stage (D5) by the operation of the lymph groove valve (pressure release, etc. in case of malfunction due to N/L type PCV stick).

Next, FIG. 17 is a schematic view of a hydraulic system according to another embodiment of the present invention, and a D-N accumulator (D-N ACCUM) may be applied instead of the check ball 25 as shown.

Although the present invention as described above has been described with reference to the illustrated drawings, it is not limited to the described embodiments, and it can be modified and modified in various ways without departing from the spirit and scope of the present invention. It is obvious to those who have it. Therefore, such modifications or variations will have to belong to the claims of the present invention, the scope of the present invention should be interpreted based on the appended claims.

1: Main filter and oil pan
2: binary vane pump
3: Auxiliary electric pump
4: regulator valve
5: Indirect control solenoid valve
6: reducing valve
7: Built-in filter
8: Damping valve
9: Torque converter valve
10: Indirect control solenoid valve
11: TC-PCV valve
12: Lock-up switch valve
13: torque converter
14: cooler
15: damping valve
16: On/off solenoid valve
17: direct acting solenoid
18, 19: Direct Act PCV
20: manual valve
21: residual pressure valve
22: lymph groove valve R
22′: Lymph groove valve D
23: SW-24
24: FSV-B3
24′: FSV-N
25: check valve
26: accumulator valve
27: check valve-LP
28: check ball-LP
29: check valve-EOP
30: as a lubricant

Claims (7)

By controlling the solenoid valve according to the applied hydraulic pressure, oil is supplied to the operating element for gear shift, and power from the engine is transmitted to the torque converter, but the oil to the operating element and the torque converter is provided by a mechanical oil pump. Characterized in that the supply of dualized,
Automatic transmission vehicle hydraulic control system. The method according to claim 1,
The mechanical oil pump is characterized in that the binary vane pump (binary vane pump) having two inlets and two outlets,
Automatic transmission vehicle hydraulic control system. The method according to claim 2,
The mechanical oil pump supplies oil at a high pressure through an outlet of an operating element side connected to the working element among the two outlets, and an operating element side through an outlet of a torque converter side connected to the torque converter side of the two outlets Characterized in that the oil is supplied at a relatively low pressure compared to the discharge port,
Automatic transmission vehicle hydraulic control system. The method according to claim 3,
The flow path to which the outlet of the operating element side of the mechanical oil pump is connected is connected to a regulator valve for controlling the line pressure, and the flow path to which the outlet of the mechanical oil pump is connected to the outlet of the torque converter is connected to the torque converter pressure. Characterized by supplying the oil necessary for lubrication,
Automatic transmission vehicle hydraulic control system. The method according to claim 4,
Further comprising an orifice provided between the flow path to which the discharge port is connected to the operating element and the flow path to which the discharge port is connected to the torque converter,
Automatic transmission vehicle hydraulic control system. The method according to claim 5,
Further comprising an ISG (Idle Stop & GO) function and an auxiliary electric pump to assist the lubricating oil at low rpm.
Automatic transmission vehicle hydraulic control system. An automatic transmission comprising a hydraulic control system according to claim 1.

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