KR0164279B1 - Control device with line-pressure preliminary control mechanism for automatic transmission - Google Patents

Abstract

The present invention prevents a sudden change in line pressure when shifting a vehicle from a driving (D) range to a second speed (S) or a first speed (L) range, thereby improving a shift feeling. It is a control device of an automatic transmission provided with a pressure preliminary control mechanism. The push button 2 primarily controls the line pressure of the transmission 14 when the shift lever 1 is pressed for shifting from the travel (D) range to the 2 speed (S) / 1 speed (L) range. By an inhibitor switch in a state in which the line pressure is primarily controlled in accordance with an electrical signal of the terminal 6 connected by the operation of the push button 2, with a switch section connected to the transmission control unit 4 so as to Since the line pressure of the transmission 14 is finally controlled in accordance with the detected shift position of the shift lever 1, the line pressure when shifting from the driving (D) range to the 2 speed (S) or 1 speed (L) range. Abrupt changes in the speed can be prevented, improving the shift feeling.

Description

Automatic transmission control unit with line pressure preliminary control mechanism

1 is a view schematically showing a control device in converting a speed of a conventional automatic transmission.

FIG. 2 is a diagram showing the change in line pressure when shifting from the driving (D) range to the second speed (S) or one speed (L) range according to the apparatus shown in FIG.

3 is a view schematically showing a control device in converting a speed of an automatic transmission according to the present invention.

FIG. 4A is a sectional view showing a line pressure preliminary control switch installed in the push button shown in FIG.

FIG. 4B is a front view of the switch portion formed in the push button shown in FIG. 4A.

5 is an operation flowchart showing an operation sequence performed in a transmission control unit according to the present invention.

FIG. 6 is a diagram showing a change in line pressure when shifting from the driving (D) range to the second speed (S) or one speed (L) range by the apparatus according to the present invention. FIG.

* Explanation of symbols for main parts of the drawings

1: shift lever 2: push button

3: shift knob 4: transmission control unit

5: switch part 6: contact

7: first partition 8: conductive member

9 shaft member 10 second partition wall

11: upper lazy connection terminal 12: lower range connection terminal

13: spring 14: transmission

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a control device of an automatic transmission, and more particularly, when the vehicle is shifted from the driving (D) range to the second speed (S) or the first speed (L) range while driving, the shock due to the shift is prevented. A control apparatus for an automatic transmission having a line pressure preliminary control mechanism is provided.

[Prior art]

Typically, a predetermined gear ratio in accordance with the speed of the vehicle in the automatic transmission is set by hydraulically actuating friction elements such as clutches and brakes selected by the line pressure. Here, the line pressure is the basic hydraulic pressure of the hydraulic circuit, and refers to the hydraulic pressure to operate the front, rear clutch and the front, rear servo, etc. by adjusting the hydraulic pressure generated by the oil pump with a pressure regulating valve.

On the other hand, when an automatic transmission equipped with a solenoid valve having a line pressure adjustment function is shifted in the same speed range, for example, in a driving state (driving (D) range), the line pressure control is performed by the transmission control unit (TCU). Appropriate voltage is applied to the line pressure regulating solenoid valve when the speed change point is reached based on the vehicle speed and accelerator opening information input to the unit, thereby reducing the impact of gear shift caused by the change of the line pressure to improve the feeling of shift. .

In addition, when the driver operates the shift lever to change the speed range in the stop (P range) or driving state (driving (D) range), the upper range connection terminal and the lower range connection terminal provided on the shift lever The inhibitor switch is activated together with the shift lever movement. The inhibitor switch senses the driver's shifting intention and sends a signal to the transmission control unit by applying a constant voltage, for example a voltage of 12V, to the transmission control unit.

Such a control device for an automatic transmission is described in Japanese Patent Publication No. 4-22741, filed under the name of the Audi Actien Gegel shaft, Germany, for example, on April 20, 1992. There is a control of the automatic transmission to improve.

In the automatic transmission control device, as shown in FIG. 1, the shift lever 122 is provided with a touch switch 124, and the touch switch 124 transfers the position of the shift lever 122 to the transmission control unit. Send a signal That is, the touch switch 124 functions as the inhibitor switch described above. The connector 131 connected to the shift lever 122 is used for the purpose of mechanically coupling the parking brake of the automatic transmission 120. Engine performance and travel performance data for operating the transmission, such as traveling speed, engine speed, engine load, shift lever position, and other data, are input to the control unit 128 of the automatic transmission. In order to engage the gear ratio, i.e., the driving range, necessary for trouble-free driving operation, the control unit 128 of the automatic transmission operates the control element of the hydraulic control system of the transmission 120.

In addition, the breaker 134 is installed on the brake pedal 130 or the bracket holding the brake pedal 130 of the driving brake of the vehicle, and when the brake pedal 130 is operated, the control unit of the automatic transmission via the conductor 136. A signal is passed to 128. The control unit 128 of the automatic transmission also operates the control element of the hydraulic control system of the transmission 120 in accordance with the transmitted signal.

[Technical problem to be achieved]

However, according to such a conventional automatic transmission control device, when the shift lever 122 is moved, in particular, when the shift lever 122 shifts from the travel (D) range to the 2 speed (S) or 1 speed (L) range, the shift lever ( By detecting the movement of the touch switch 124 or the inhibitor switch 122 to the control unit 128 of the automatic transmission, the second speed (S) or the first speed (L) from the driving (D) range of FIG. As can be seen from the diagram showing the change in the line pressure at the time of shifting to the range, the control apparatus of the conventional automatic transmission shifts from the driving (D) range to the 2 speed (S) or 1 speed (L) range. When controlling the pressure, the line pressure is rapidly reduced from the travel (D) range to the 2 speed (S) or 1 speed (L) range, so that the optimum line pressure control is difficult due to the rapid reduction of the line pressure. And, there was a problem that the shifting feeling is lowered.

Accordingly, it is an object of the present invention to prevent a sudden change in line pressure when shifting a vehicle, in particular when shifting from a driving (D) range to a second speed (S) or one speed (L) range, thereby improving the shift feeling. The present invention provides a control device for an automatic transmission having a line pressure preliminary control mechanism.

[Configuration and Function of Invention]

The above object is a shift lever for shifting a vehicle traveling speed; It is installed on the shift knob of the shift lever to lock and release the locking structure for locking the shift lever to prevent erroneous operation from the travel range, and the 2 speed (S) / 1 speed (L) range from the travel (D) range. A push button having a switch part which is electrically connected when pressed for shifting of the furnace; An inhibitor switch installed in the shift lever to sense a position of the shift lever moved for shifting in accordance with the operation of the push button; In the state in which the line pressure of the transmission is primarily controlled in accordance with the signal of the terminal connected by the operation of the push button, the line pressure of the transmission is finally controlled in accordance with the position detection signal of the shift lever detected by the inhibitor switch. It is achieved by a control device of an automatic transmission with a line pressure preliminary control mechanism according to the invention, characterized in that it comprises a transmission control unit for controlling the line pressure control solenoid valve.

In the above, the shift knob has a pair of contacts installed to be connected to the transmission control unit, and a spring installed at the shift knob to restore the push button, and the push button is positioned at an opposite position to be electrically connected to the contact. It has a switch unit.

On the other hand, the switch portion is formed of a non-conductive plate body, and a band-shaped conductive member is embedded.

By the above-described configuration, in order for the driver to shift from the driving (D) range to the second speed (S) or the first speed (L) range while driving the vehicle, in order to prevent misoperation from the driving range. When the push button for locking the shift lever is pressed, the push button operates the switch unit installed therein, and the transmission control unit in accordance with the signal applied according to the operation of the switch unit transmits the line pressure of the transmission to reduce the line pressure of the transmission primarily. In accordance with the shift lever position detection signal of the inhibitor switch that detects the position of the shift lever moved for shifting after the locking state is released by the operation of the push button in the state of controlling the opening of the control solenoid valve as the primary control, The opening of the line pressure control solenoid valve is controlled to finally reduce the line pressure of the transmission to the pressure for shifting. All.

EXAMPLE

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view schematically showing a control device for converting the speed of an automatic transmission according to the present invention. As can be seen from FIG. 3, a driver typically shifts from the driving (D) range to the second speed (S) or the first speed (L) range in order to travel on a slope or a climbing road while driving a vehicle. It is necessary to press the push button 2 provided on the shift knob 3 located at the top of the shift lever 1. The push button 2 is a mechanism for locking the shift lever 1 into the travel range D to prevent erroneous operation from the travel range D by the driver or another occupant to the other shift range.

The push button 2 has a switch section 5 installed therein, as shown in FIG. 4A. On the other hand, the shift knob 3 is installed in the first partition 7 which has a pair of contacts 6 upright inward so as to be connected to the transmission control unit 4, and the contact 6 is the first partition 7 Is connected to the transmission control unit 4 via a lead portion (not shown) formed in the figure. The switch portion 5 of the pushbutton 2 is formed of a non-conductive plate such as plastic, and a band-shaped conductive member 8 (see also 4b) is embedded at a position opposite to the contact 6. It is provided in the shaft member 9 which connects the push button 2 and the switch part 5, and is supported by the 2nd partition 10. As shown in FIG.

Referring back to FIG. 3, the driver presses the push button 2 to shift from the travel (D) range to the second speed (S) or the first speed (L) range while traveling The switch unit 5 installed on the push button 2 connects the contacts provided on the shift knob to each other so that the electricity is transmitted. The energization transmits the driver's shifting intention to the transmission control unit 4.

The transmission control unit 4 controls the line pressure control solenoid valve (not shown) provided in the transmission 14 so as to control the transmission 14 primarily (preliminarily) in accordance with a signal according to the energization of the switch section 5. By controlling, the line pressure is reduced by a certain amount. In addition, the push button 2 releases the locking state of the locking mechanism for preventing the misoperation of the shift lever 1 so that the shift lever 1 is positioned in the required range.

When the shift lever 1 is positioned at the required shift range, an inhibitor switch comprising an upper range connecting terminal 11 and a lower range connecting terminal 12 installed in the shift lever 1 stops the movement of the shift lever 1. Sense and apply a signal to the transmission control unit (4). In accordance with the signal applied by the inhibitor switch, the transmission control unit 4 controls the line pressure control solenoid valve to finally control the line pressure of the transmission 14, so that the line pressure is 2 speed (S) or 1 speed ( L) The pressure is reduced to the speed for shifting into the range.

5 is an operation flowchart showing an operation sequence performed in a transmission control unit according to the present invention. First, the transmission control unit 4 determines whether the push button 2 has been operated (S1), and when the push button 2 is operated, the contact point by the switch unit 5 installed at the push button 2 ( By sensing the energizing signal of 6), the opening degree of the line pressure control solenoid valve installed in the transmission 14 is controlled to primarily control the line pressure of the transmission 14 (S2). The line pressure is primarily reduced in pressure for shifting by primary control of the line pressure control solenoid valve.

In the step S2, in accordance with the control of the opening degree of the line pressure control solenoid valve, in the state in which the line pressure of the transmission 14 is primarily depressurized, it is determined whether or not the shift lever 1 is switched in accordance with the signal from the inhibitor switch. If it is determined (S3) that the movement of the shift lever 1 is not changed at this time and the push button 2 is continuously pressed, the flow returns to step S2, where the line pressure of the transmission 14 continues. To continuously control the opening degree of the line pressure control solenoid valve to maintain the primary depressurized state.

In step S3, when it is determined that the shift of the shift lever 1 is converted in accordance with the signal of the inhibitor switch, the opening degree of the line pressure control solenoid valve is controlled to finally control the line pressure of the transmission 14 as described above. (S4). By the opening of the line pressure control solenoid valve, the line pressure of the transmission is finally reduced to the line pressure for shifting.

6 is a diagram showing a change in line pressure at the time of shifting from the driving (D) range to the second speed (S) or one speed (L) range by the apparatus according to the present invention. In FIG. 6, the push button is used to shift the driver to the 2nd speed (S) or 1st speed (L) range to drive the ramp or slope from the driving (D) range (section A in FIG. 6) while driving. When (2) is pressed (step S1 in FIG. 5, the start point of section B), the transmission control unit 4 controls the line pressure control solenoid valve so as to alleviate the shift shock caused by the shift, thereby reducing the line pressure of the transmission 14. Primary control (step S2 of FIG. 5, section B in FIG. 6). In section B, when the shift lever 1 is positioned at the required shift range, the signal of the inhibitor switch is input to the transmission control unit 4, and as the signal of the inhibitor switch is input, the transmission control unit 4 is shifted to the transmission. The opening degree of the line pressure control solenoid valve is controlled to finally control the line pressure of 14, so that the line pressure is reduced to the line pressure for shifting (step S4 in FIG. 5, section C in FIG. 6).

In the above, the line pressure in the section B is set to a minimum value for preventing the internal clutch of the automatic transmission from slipping, which may occur during driving of the vehicle due to the pressure drop, so that the driver presses only the push button 2. In the case where no range conversion is made (NO at step S3 in FIG. 5), the internal clutch slip of the automatic transmission due to the line pressure drop is prevented.

In addition, when the range of the shift lever 1 is not changed by setting the first reduced line pressure to a minimum value for preventing the internal clutch of the automatic transmission from slipping during driving of the vehicle due to the pressure drop. Since the speed change stage during driving can be maintained, even when the push button 2 is released and the line pressure is increased by returning from the B section to the A section, the shift does not occur. It does not occur.

[Effects of the Invention]

As mentioned above, according to the control apparatus of the automatic transmission provided with the line pressure preliminary control mechanism which concerns on this invention, a 2 speed (S) or 1 speed (L) range from a driving (D) range while a driver drives a car. When shifting to the furnace, the switch unit installed on the push button is operated to primarily control the line pressure of the transmission to prevent a sudden drop in the line pressure, and according to the position of the shift lever finally converted for shifting. Since the line pressure is finally controlled, the shift feeling can be improved when shifting from the driving (D) range to the second speed (S) or the first speed (L) range.

Claims (3)

A shift lever for shifting a vehicle traveling speed; It is installed on the shift knob of the shift lever to lock and release the locking structure for locking the shift lever to prevent erroneous operation from the travel range, and the 2 speed (S) / 1 speed (L) range from the travel (D) range. A push button having a switch part which is electrically connected when pressed for shifting of the furnace; An inhibitor switch installed in the shift lever to sense a position of the shift lever moved for shifting in accordance with the operation of the push button; In the state in which the line pressure of the transmission is primarily controlled in accordance with the signal of the terminal connected by the operation of the push button, the line pressure of the transmission is finally controlled in accordance with the position detection signal of the shift lever detected by the inhibitor switch. And a transmission control unit for controlling the line pressure control solenoid valve. 2. The shift knob according to claim 1, wherein the shift knob has a pair of contacts installed to be connected to the transmission control unit, and a spring installed at the shift knob to restore the push button, and the push button is disposed to be electrically connected to the contact. The control apparatus of the automatic transmission provided with the line pressure preliminary control mechanism characterized by having a switch part located in a position. 3. The control apparatus of an automatic transmission according to claim 2, wherein said switch portion is formed of a non-conductive plate member, and a band-shaped conductive member is embedded.