KR20180075130A - AT liguid system having 3 Way Torque Converter using compressor and pump - Google Patents

Abstract

The present invention provides a three-way torque convert mounted AT hydraulic system using a compressor and a pump, which includes an electric pump for performing on-off charge control and rpm control for relieving the pressure peak of the electric pump, wherein the electric pump performs on-demand driving for supplying a flow rate required by a normally-driven mechanical pump that supplies a flow rate required for T/Con control and a transmission system; a mechanical pump using a constant flow rate for low pressure characteristics in the T/Con system; and a compressor using a gas filling type and a spring filling type to form a system pressure. Thus, the hydraulic pressure supply lines of the T/Con control system and the shift control system are dualized and the system pressures are dualized by applying a constant driven small-sized mechanical pump and a small-sized electric pump. In the case of the on-demand type electric pump, after the pressure is compressed to a pressure higher than the system pressure, the on-demand type electric pump is turned off to minimize the drive loss and only when the transmission system pressure is lowered to the required pressure, the pump is driven again, so the drive loss can be minimized.

Description

{AT liguid system having 3 way torque converter using compressor and pump}

In the present invention, a low-capacity constant-speed mechanical pump is applied to a T / Con (torque converter) pressure using a relatively low pressure, and a clutch control part involved in a shift control uses an accumulator and an on- Way torque converter mounted AT hydraulic system through application of an accumulator and electric pump to minimize the flow rate required for the hydraulic control system.

Generally, in a hydraulic circuit diagram applied to an AT, in the case of a reducing valve for generating an indirect control sol supply pressure, the line pressure is supplied from the line pressure passage, and the pressure is reduced to a low pressure (5.0-5.5 bar) Pressure drop (eg, pressure drop from 5.5 bar to line pressure of 16 bar) will occur, and when a large amount of flow is introduced, the regulator valve will generate a large amount of drain flow for line pressure control, There is a lot of flow loss structure.

From an efficiency or energy point of view, the energy loss due to the pressure drop between the supplied pressure and the controlled pressure is indicative of a loss of efficiency.

As shown in FIG. 1, the structure for AT employing a 3-way T / Con is generally designed such that the T / Con (Torque Converter) pressure in the line pressure control range is generally 2 to 7 bar Use a lower, low pressure, 6 bar level pressure.

When damper clutch lock up control, lock up pressure uses line pressure, and T / Con In side pressure becomes pressure less than 6 bar.

In normal lockup control, T / Con pressure is lower than Reducing pressure which provides the supply pressure of Indirect Control Sol. At low rpm, the lockup pressure or T / Con pressure becomes low or the amount of lubricant can be reduced .

In the H / W valve body which embodies the hydraulic circuit diagram, a spool valve is applied to control various kinds of pressure. In this case, since the clearance is more than a certain level for the perturbation of the spool valve, the leakage flow rate is obtained.

In case of relatively low rpm, drain flow occurs at TCV (T / Con Pressure Control Valve), and the flow rate is discarded from the regulator valve toward the high rpm.

In particular, it is better that there is no flow discarded from the regulator valve in the low rpm region. However, in reality, the leakage flow occurs even in the low rpm region. Especially, when the system is unstable, the flow amount drained from the regulator valve becomes relatively large, Regulator valve that controls the pressure required for the system is applied as in the normal hydraulic circuit diagram of AT, and one constant-speed mechanical pump is applied to the pump.

In recent years, there have been more and more cases in which pumps are applied in a dual mode.

However, when reducing the pump capacity and reducing the capacity of the regulator valve in order to reduce the driving torque, normal pressure control may be difficult in the low rpm range. Therefore, the capacity of the pump must be controlled by the T / Con, damper clutch, , The pump capacity reduction is limited.

In addition, since a large amount of flow exceeding the required flow rate must be discarded at the time of line pressure control and T / C pressure control, unnecessary discharge flow rate relative to the flow rate required by the system at high rpm is disadvantageous in terms of efficiency, .

In addition, since the supply pressure of the reducing valve uses a line pressure of a high pressure, a loss due to a pressure drop occurs. When the system is unstable and a large amount of flow is supplied, a regulator valve and a T / The drain flow rate is increased.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a low-capacity constant-speed mechanical pump for a T / Con pressure using a relatively low pressure, It is aimed to provide a three-way torque converter mounted AT hydraulic system by applying an accumulator and electric pump to minimize the flow rate required for the hydraulic control system by optimizing the hydraulic pressure and the flow rate by applying the -demand drive electric pump.

In order to solve the above problems, the present invention provides rpm control for on-off charging control and relieving the pressure peak of an electric pump, an always-driven mechanical pump for supplying the flow rate required for T / Con control, An electric pump for on-demand driving to supply the fuel; In the case of the T / Con control system, a mechanical pump that uses a constant flow rate for low pressure characteristics; And an accumulator that uses a gas filling type and a spring filling type to form a system pressure, wherein the hydraulic pressure supply line of the T / Con control system and the shift control system are biased to be constantly driven, The on-demand type electric pump is charged to a pressure higher than the system pressure and then is turned off to minimize the driving loss. When the transmission system pressure is lowered to the required pressure again, .

In the case of 8-speed AT, T / Con control unit consisting of SVFS controlling T / Con pressure, T / Con valve, TC-PCV and Lub-SW valve as spool valves, accumulator forming system pressure, PPV soles to control, SW valves responsible for Fail_Safe functions, Fail_Safe valves, and manual valves for implementation of driver shifting.

Depending on the use of the on-demand electric pump and the accumulator, a check valve or a check valve is applied to the rear of the accumulator or the pump discharging part so that the accumulated pressure does not leak.

And a low leak PPV Sol having its own F / back for high-pressure control to perform the control by receiving the varying pressure.

And a damping valve acting as a peak pressure region to relieve a peak characteristic of a pressure supplied when the electric pump is turned on and off.

Pressure control valve of the shift control system is used instead of the normally-driven pump pressure of the low pressure in the case of the lock-up control of the T / Con.

In the present invention as described above, since the T / Con pressure using the low pressure uses the small-sized normally-driven mechanical pump, the loss can be minimized by optimizing the pressure.

Further, since the system pressure of the transmission control unit according to the present invention uses a small-sized electric pump, the pump drive loss is minimized through on-demand drive. Particularly, the electric pump can be miniaturized because it is not involved in the supply of lubricating oil.

Also, since the accumulator applied to the system unit of the transmission control unit according to the present invention is filled with necessary pressure according to the driving of the electric pump driven on-demand only when necessary, the flow loss through the elimination of the regulator valve is minimized.

In addition, the present invention minimizes unnecessary drain flow during control of Sol valve by applying PPV solenoid valve for high pressure and low leak to contribute to increase efficiency by minimizing flow loss.

Further, the present invention can fully realize the ISG function by applying the electric pump.

In the present invention, the normally-driven pump applied to the T / Con control side does not cause any problem even if the normally-driven pump is not driven in accordance with a condition that normally does not lock up when the ISG function is performed.

Further, in the case of the lubricating oil amount, since the low pressure T / Con pressure is used, the present invention has a small pressure drop and is advantageous for efficiency such as no load loss.

FIG. 1 is a simplified schematic diagram for explaining the hydraulic circuit diagram according to the prior art, showing a T / Con control system and a line pressure control system.
FIG. 2 is a hydraulic circuit diagram in which the mass production is being prepared according to the prior art.
3 is a block diagram showing a high-efficiency control concept to which a 3-way T / Con-applied accumulator and an electric pump are applied according to an embodiment of the present invention.
4 is a view showing a 3Way T / Con type AT hydraulic circuit diagram to which an accumulator and an electric pump are applied according to an embodiment of the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, detailed descriptions of well-known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

3 is a block diagram showing a high-efficiency control concept to which a 3-way T / Con-applied accumulator and an electric pump are applied according to an embodiment of the present invention.

3, the present invention mainly includes a T / Con valve 10, a TCV 20, a TC-PCV 30, an accumulator 40, a mechanical pump 50, an electric pump 60, etc. .

The accumulator 40 uses a gas filling type and a spring filling type to form the system pressure.

In the case of the T / Con control system, the mechanical pump 50 is a pump that uses an always-constant flow rate in accordance with the low-pressure characteristic.

The electric pump 60 performs on-off charging control and rpm control for relieving the pressure peak of the electric pump. It also supplies a constant-speed mechanical pump that supplies the flow rate required for T / Con control and a flow rate required for the transmission system It is an on-demand driven pump.

Therefore, the hydraulic pressure supply lines of the T / Con control system and the shift control system are biased to apply a small mechanical pump and a small electric pump, respectively, to make the system pressure binary. In the case of the on- demand type electric pump, The drive loss can be minimized by filling the valve up to the pressure, turning off the valve to minimize the drive loss, and driving the valve only when the pressure of the transmission system is lowered to the required pressure.

3, according to the present invention, in the case of the T / Con control unit, a mechanical-type constant-speed drive pump is applied to control the low-pressure constant drive pressure to be supplied and controlled. In the clutch control unit involved in the shift control, The pump pressure and the accumulator are applied to generate the system pressure by utilizing the driving pump pressure which is on-demand driven.

Therefore, in the case of the electric pump 60 that generates the system pressure and minimizes the capacity reduction and drive loss of the mechanical pump that is always driven, it has an efficiency increase effect of performing on-demand drive only when necessary. In the case of the lock-up pressure, the pump pressure for high-speed shift control is used.

4 is a view showing a 3Way T / Con type AT hydraulic circuit diagram to which an accumulator and an electric pump are applied according to an embodiment of the present invention.

As shown in FIG. 4, the detailed hydraulic circuit diagram is based on an 8-stage AT, and includes an SVFS for controlling T / Con pressure, a T / Con valve 10 as a spool valve, a TC- -SW valves, an accumulator (40) for forming system pressure, PPV Sol for controlling each clutch, and various SW valves and Fail_Safe valves for fail-safe function. And manual valves for intentional implementation.

In addition, it is divided into an always-on drive pump for supplying a flow rate required for T / Con control and an electric pump 60 for on-demand drive for supplying a flow rate necessary for the transmission system.

In detail, the present invention performs on-off charging control, rpm control for relieving the pressure peak of the electric pump, and provides a constantly driven mechanical pump for supplying the flow rate required for T / Con control and a flow rate required for the transmission system In the case of the electric pump 60 and the T / Con control system that are driven on-demand to perform the on-demand operation, the mechanical pump 50 that uses the constant flow rate in accordance with the low pressure characteristic is used to supply the hydraulic pressure to the T / Con control system and the shift control system The system pressure can be biased by applying the small-sized mechanical pump 50 and the small-sized electric pump 60 that are operated at all times.

Further, in the case of the T / Con control system, by using the flow rate of the small-sized normally-driven mechanical pump 50, it is possible to optimize it according to the low-pressure characteristic, and it becomes unnecessary to generate the high-pressure discharge pressure.

In the case of the shift control system, a dual-flow electric pump is applied to supply a small amount of flow, and the discharge pressure is filled in the accumulator to utilize the filled pressure flow rate if necessary. On the other hand, -demand type minimizes pump drive losses.

In the case of an on-demand type electric pump, the drive loss is minimized by charging to a pressure higher than the system pressure, and then the drive loss is minimized by re-driving only when the transmission system pressure is lowered to the required pressure.

At this time, the accumulator 40 can use a gas filling type and a spring filling type.

Also, when the electric pump 60 is turned on or off, the charging pressure is controlled on-off. However, if necessary, the rpm control can be locally performed to relieve the pressure peak of the electric pump.

Also, in accordance with the use of the on-demand electric pump and accumulator, it is necessary to apply a check valve or check valve to the back of the pump discharge part or the accumulator to prevent leakage of the accumulated pressure.

In addition, unlike conventional pressure control Sol valve which controls by receiving controlled pressure, it uses low leak PPV sol which has its own F / back for control with varying pressure. In this case, Should be performed.

Also, damping valve which takes charge of the peak pressure range can be applied to relieve the peak pressure when the electric pump is turned on and off.

In the case of T / Con's LockUp control, the control concept is matched by using the high-pressure accumulator negative pressure of the shift control unit instead of the low-pressure normally driven pump pressure.

In addition, for low leak design, independent control method is available instead of possible interlocking control, but it can be designed according to the judgment of the designer.

10: T / Con valve
20: TCV
30: TC-PCV
40: Accumulator
50: Mechanical pump
60: electric pump

Claims (13)

A mechanical pump for supplying the necessary flow rate for T / Con control;
An electric pump that supplies a flow rate necessary for the transmission system;
And an accumulator connected to the electric pump to form a system pressure,
Way torque converter mounted AT hydraulic system through application of an accumulator and an electric pump for dualizing the system pressure by dividing the hydraulic pressure supply line of the T / Con control system and the shift control system by the mechanical pump and the electric pump. The method according to claim 1,
Wherein the mechanical pump is driven at all times. The three-way torque converter-equipped AT hydraulic system through application of an accumulator and an electric pump. 3. The method of claim 2,
Wherein the mechanical pump using the constant flow rate is operated at a low pressure. 3. The three-way torque converter mounted AT hydraulic system according to claim 1, The method according to claim 1,
Wherein the electric pump drives the flow rate required for the transmission system on-demand. The three-way torque converter-equipped AT hydraulic system through the application of the accumulator and the electric pump. 5. The method of claim 4,
Characterized in that the electric pump performs on-off charging control or rpm control, and a three-way torque converter mounted AT hydraulic system through application of an accumulator and electric pump. 6. The method of claim 5,
Characterized in that the rpm control of the electric pump is intended to relieve the pressure peak, and a 3-way torque converter mounted AT hydraulic system through application of an accumulator and electric pump. The method according to claim 1,
Wherein the accumulator is a gas filling type or a spring filling type, and a 3-way torque converter mounted AT hydraulic system through application of an accumulator and an electric pump. 8. The method of claim 7,
For on-demand type electric pumps,
Way torque converter-mounted AT hydraulic system through application of accumulator and electric pump, characterized in that the drive loss is minimized by charging to a pressure higher than the system pressure and then turning off. 9. The method of claim 8,
Way torque converter mounted AT hydraulic system through application of an accumulator and electric pump, characterized in that the drive loss is minimized by driving again only when the system pressure is lowered to the required pressure. 10. The method of claim 9,
And a check valve or a check ball valve is applied to the rear of the accumulator or the pump discharging portion so as to prevent the filled axial pressure from leaking, and a three-way torque converter mounted AT hydraulic system through application of the accumulator and electric pump. 11. The method of claim 10,
Further comprising a low leak PPV sol having a high pressure self-control F / back for controlling the pressure to be supplied to the hydraulic pump. The three-way torque converter-equipped AT hydraulic system using the accumulator and the electric pump. 12. The method of claim 11,
Further comprising a damping valve for taking charge of a peak pressure region in order to alleviate a peak characteristic of a pressure supplied when the electric pump is turned on and off. The three-way torque converter- system. 13. The method of claim 12,
Way torque converter-mounted AT hydraulic system through application of an accumulator and an electric pump, characterized in that a high-pressure accumulating negative pressure of the shift control system is used in the lockup control of the T / Con.

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