KR100460895B1 - Hydraulic line pressure controlling system of automatic transmission - Google Patents

Abstract

The present invention relates to a line pressure control system of an automatic transmission that can reduce claims such as improvement in durability of the clutch and seizure of the transmission by eliminating shift shock that may occur from the hydraulic "0" state at the start of the automatic transmission vehicle. The present invention provides a line pressure control system for an automatic transmission, comprising: a hydraulic pressure detector for detecting a hydraulic pressure formed in a hydraulic circuit in the automatic transmission; A shift controller configured to analyze a signal input from the oil pressure detector and compare the magnitudes of the detected oil pressure and the set oil pressure to generate a hydraulic circuit protection control signal for protecting the hydraulic system in the automatic transmission when the detected oil pressure is smaller than the set oil pressure; ; Hydraulic supply actuator is driven in response to the hydraulic circuit protection control signal generated from the shift control unit to form a hydraulic circuit corresponding to the neutral (N) shift stage in the hydraulic system to drain the hydraulic pressure supplied to each clutch Consists of including.

Description

HYDRAULIC LINE PRESSURE CONTROLLING SYSTEM OF AUTOMATIC TRANSMISSION}

The present invention relates to an automatic transmission, and more particularly to a line pressure control system of an automatic transmission.

Typically, there is a clutch within the automatic transmission that is responsible for the power transmission element, which is configured to transmit power by hydraulic actuation of the piston.

The path through which hydraulic pressure is transmitted in the automatic transmission will be described.

Engine ⇒ Oil Strainer ⇒ Oil Pump in Automatic Transmission ⇒ Valve Body (Hydraulic System) ⇒ The formed hydraulic pressure is controlled from each clutch ⇒ Automatic transmission from the oil cooler ⇒ Oil cooler to the automatic transmission.

If the hydraulic pressure is "0" in the state in which the hydraulic pressure is transmitted in the automatic transmission as described above, there is no design supplement to this case because it is not a normal condition.

When the hydraulic pressure is formed to be "0" during the actual vehicle operation, there are cases where the hydraulic pressure is not formed due to the lack of automatic transmission oil or the leakage of the transmission.

In addition, there was a case where the oil could not be inhaled momentarily during sudden braking or heavy downhill.

In addition, the oil level line is inclined instantaneously in a place where the automatic transmission car is suddenly braked or severely inclined, so that the hydraulic pressure is formed as "0".

As described above, if the hydraulic pressure normally supplied is lost, the clutch is slipped and the automatic transmission may be sintered with the clutch or may cause severe shift shock.

In other words, if there is no oil supply, the hydraulic pressure must be continuously formed in the "D" range within the transmission, but a constant pressure must be formed. This is not supplied so that the clutch can slip.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line pressure control system of an automatic transmission that can reduce claims such as improvement of durability of clutch and attachment of transmission by eliminating shift shock that may occur from hydraulic "0" state at the time of rapid start of the automatic transmission vehicle. It is.

1 is a view showing the configuration of a line pressure control system of an automatic transmission according to an embodiment of the present invention.

2 is a view showing the configuration of the hydraulic pressure detector mounted on the oil strainer according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a line pressure control system for an automatic transmission, comprising: a hydraulic pressure detector for detecting a hydraulic pressure formed in the hydraulic circuit in the automatic transmission; A shift controller configured to analyze a signal input from the oil pressure detector and compare the magnitudes of the detected oil pressure and the set oil pressure to generate a hydraulic circuit protection control signal for protecting the hydraulic system in the automatic transmission when the detected oil pressure is smaller than the set oil pressure; ; Hydraulic supply actuator is driven in response to the hydraulic circuit protection control signal generated from the shift control unit to form a hydraulic circuit corresponding to the neutral (N) shift stage in the hydraulic system to drain the hydraulic pressure supplied to each clutch Characterized in that comprises a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 and 2, a configuration of a line pressure control system of an automatic transmission according to an exemplary embodiment of the present invention will be described.

Embodiment of the present invention comprises a hydraulic pressure detecting unit 110, a transmission control unit 120 (TCU), a hydraulic pressure supply actuator 130 in the line pressure control system of the automatic transmission.

The oil pressure detector 110 functions to detect the oil pressure formed in the oil pressure circuit in the automatic transmission.

The hydraulic detection unit 110 is mounted in the oil discharge port 212 of the oil strainer 210 connected to the valve body inlet as shown in FIG.

Here, the oil pressure detector 110 and the oil strainer 210 may be configured in one piece.

The configuration of the hydraulic pressure detector 110 will be described with reference to FIG. 2.

The hydraulic pressure detector 110 includes a solenoid valve 112, a piston 114, and a spring 116.

The solenoid valve 112 is mounted on one side of the oil outlet 212 of the oil strainer 210 to detect a hydraulic pressure formed between the oil outlet 212 and the valve body inlet of the oil strainer 210 to shift a corresponding signal. Input to the control unit 120 (TCU).

The piston 114 is mounted on the other side of the oil outlet 212 of the oil strainer 210 corresponding to the mounting position of the solenoid valve 112 and is shown in FIG. 2 in the oil outlet 212 according to the magnitude of the hydraulic pressure delivered. As shown, it is moved in the left and right directions.

The spring 116 is mounted between the solenoid valve 112 and the piston 114 in the oil discharge port 212, and is interlocked according to the magnitude of the pressing force transmitted from the piston 114.

For example, if the pressing force of the piston 114 is greater than the elastic force of the spring 116, the spring 116 is compressed in the right direction of FIG.

In this state, when the pressing force of the piston 114 is released and the elastic force of the spring 116 becomes greater than the pressing force of the piston 114, a restoring force is generated in the spring 116 to move the piston 114 in the left direction of FIG. 2. Let's do it.

The shift control unit 120 (TCU) analyzes a signal input from the oil pressure detector 110 and compares the detected oil pressure with the set oil pressure stored in the memory unit 150. Generates a hydraulic circuit protection control signal to protect the hydraulic system in the engine.

Here, the size of the set hydraulic pressure stored in the memory unit 150 according to the embodiment of the present invention is set to "0".

For reference, when the oil pressure detected at the oil outlet 212 of the oil strainer 210 is "0", the oil pressure may be "0" instantaneously according to the inclined state of the automatic transmission in a sudden braking or a severe slope. Can be.

In addition, even when other contaminants are adsorbed on the screen (filter) of the oil strainer 210 in the automatic transmission and interfere with the flow of oil supplied to the hydraulic system through the oil outlet 212, the hydraulic pressure may be detected as "0". Can be.

An embodiment of the present invention is characterized in that it protects the hydraulic system in the automatic transmission when normal hydraulic pressure is not formed in the hydraulic circuit in the automatic transmission as in this case.

On the other hand, the shift control unit 120 (TCU) generates a warning control signal for warning the hydraulic circuit abnormal state if the detected hydraulic pressure is less than the size of the set hydraulic pressure.

The embodiment of the present invention further comprises a warning unit 140 which is driven according to the input of the warning control signal generated from the shift control unit 120 (TCU) to warn the abnormal state of the hydraulic circuit.

The hydraulic pressure supply actuator 130 is driven in response to the input of the hydraulic circuit protection control signal generated from the shift control unit 120 (TCU) to form a hydraulic circuit corresponding to the neutral (N) shift stage in the hydraulic system to the respective clutches. Drain the supplied hydraulic pressure.

With the above configuration, the embodiment of the present invention provides a flow of oil when the vehicle suddenly becomes hydraulic pressure "0" in a sudden braking or a severe slope, or other contaminants are adsorbed on the screen of the oil strainer 210 in the automatic transmission. This can protect the hydraulic system in the automatic transmission when it is not possible to form a normal hydraulic pressure.

That is, the embodiment of the present invention is configured to detect the presence of the hydraulic pressure "0" through the oil strainer 210 by configuring the oil pressure detector 110 to detect whether the oil pressure is "0" in the oil strainer 210 and the shift control unit Through 120 (TCU), the solenoid valve 112 of each hydraulic system is opened to make the neutral (N) state to protect the hydraulic system.

The hydraulic pressure generated through the oil pump is configured to supply hydraulic pressure to each hydraulic system through the oil body strainer 210 through the valve body.

1 and 2 will be described the operation of the line pressure control system of an automatic transmission according to an embodiment of the present invention.

First, it will be described on the assumption that the oil pump configured in the automatic transmission is simultaneously rotated at the same time as starting the engine and the oil is moved through the oil strainer 210 according to the rotation of the oil pump.

As shown in FIG. 2, when the oil is detected in the oil discharge port 212 of the oil strainer 210 in the state where the oil flows along with the ① oil flow shown in FIG. 116) Beat the force and move to the right.

The piston 114 is compressed with one side of the solenoid valve 112.

At this time, the solenoid valve 112 sends the compressed signal to the shift control unit 120 (TCU).

This condition means normal operating conditions.

However, when hydraulic pressure is not applied to the piston 114 in the state where the hydraulic detection unit 110 is configured at the oil discharge port 212 of the oil strainer 210 as shown in FIG. 2, the piston 114 and the solenoid valve 112 are not applied. ) Are kept spaced apart from each other by the spring 116.

In this case, the solenoid valve 112 may detect the hydraulic "0" state.

For example, when foreign matter is adsorbed on the screen of the oil strainer 210 or when the hydraulic pressure is not formed in the oil outlet 212 of the oil strainer 210 according to the inclination state of the vehicle, the oil outlet of the oil strainer 210. No oil is sucked into 212.

In this case, when the automatic transmission is driven, the hydraulic circuit is in an abnormal state, and the hydraulic control unit 110 provides information about the hydraulic circuit abnormal state to the transmission control unit 120 (TCU).

The transmission control unit 120 (TCU), which receives the information on the hydraulic circuit abnormal state from the hydraulic detection unit 110, supplies the hydraulic circuit protection control signal for protecting the hydraulic system in the automatic transmission to the hydraulic supply actuator 130.

The hydraulic supply actuator 130 is driven according to the input of the hydraulic circuit protection control signal generated from the shift control unit 120 (TCU) to drain the line pressure operating the clutch of the hydraulic system to protect the hydraulic system. Can be.

If two consecutive driving cycles occur about two times, the engine check lamp constituting the warning unit 140 may be turned on and used as a general automatic transmission failure code.

As described above, the line pressure control system of the automatic transmission according to the present invention can reduce claims such as improving durability of the clutch and compacting the transmission.

Further, there is an effect that the shift shock phenomenon coming from the oil pressure " 0 " at the time of rapid start can be eliminated.

Claims (6)

In the line pressure control system of an automatic transmission, An oil pressure detector for detecting oil pressure formed in the oil pressure circuit in the automatic transmission; A shift controller configured to analyze a signal input from the oil pressure detector and compare the magnitudes of the detected oil pressure and the set oil pressure to generate a hydraulic circuit protection control signal for protecting the hydraulic system in the automatic transmission when the detected oil pressure is smaller than the set oil pressure; ; Hydraulic supply actuator is driven in response to the hydraulic circuit protection control signal generated from the shift control unit to form a hydraulic circuit corresponding to the neutral (N) shift stage in the hydraulic system to drain the hydraulic pressure supplied to each clutch Line pressure control system of an automatic transmission, characterized in that it comprises a. The line pressure control system of an automatic transmission according to claim 1, wherein the hydraulic pressure detector is mounted on an oil discharge port of an oil strainer connected to the valve body suction port. The line pressure control system of an automatic transmission according to claim 2, wherein the hydraulic detection unit and the oil strainer are integrally formed. According to claim 2, wherein the hydraulic pressure detection unit is mounted on one side of the oil discharge port of the oil strainer and the solenoid valve for detecting the hydraulic pressure formed between the oil discharge port of the oil strainer and the valve body suction port and supplies to the shift control unit; A piston which is mounted on the other side of the oil discharge port of the oil strainer corresponding to the mounting position of the solenoid valve and moved in a corresponding direction according to the amount of hydraulic pressure transmitted; And a spring mounted between the solenoid valve and the piston, the spring being interlocked according to the magnitude of the pressing force transmitted from the piston. The line pressure control system of an automatic transmission according to claim 1, wherein the shift control unit generates a warning control signal for warning an abnormal state of a hydraulic circuit when the detected hydraulic pressure is smaller than a set hydraulic pressure. The line pressure control system of an automatic transmission according to claim 5, further comprising a warning unit which is driven according to an input of a warning control signal generated from the shift control unit to warn an abnormal state of the hydraulic circuit.