KR101079006B1 - Method for controlling transmission of dual clutch transmission of vehicle - Google Patents

Abstract

Disclosed is a method for controlling down shift of a dual clutch transmission for a vehicle in which a shift feeling is improved by removing a run-up phenomenon at the end of the shift during downshift shifting. The present invention, the first step of detecting the acceleration signal of the acceleration sensor for detecting the pressing degree of the accelerator pedal; Transmitting an engine speed reduction request signal generated by the shift controller to the engine controller when the downshift is shifted based on the acceleration signal of the acceleration sensor; And transmitting the reduced engine speed in response to the engine speed reduction request signal to an output side through control of the first and second clutches. According to the present invention, the engine rotation generated in the shift control unit during downshift shifting is performed. Since the engine speed reduced based on the number reduction request signal is transmitted to the output side through the control of the first clutch and the second clutch, the run-up occurring at the end of the shift is eliminated and the shift time is shortened, thereby shifting quality and shifting feeling. Gain an effect that can be improved.

Automobile, dual damper clutch, downshift, engine speed reduction signal, engine control unit

Description

Shift control method of dual clutch transmission for vehicle {METHOD FOR CONTROLLING TRANSMISSION OF DUAL CLUTCH TRANSMISSION OF VEHICLE}

The present invention relates to a scheme for improving a shifting feeling during downshifting. More particularly, the engine speed reduced according to an engine speed reduction request signal of a shift control unit during downshifting is converted into a first clutch and a second clutch. The present invention relates to a shift control method of a dual clutch transmission of a vehicle to be transmitted to an output side through a control to remove a run-up of engine speed generated at the end of the shift.

As is well known, the dual clutch transmission includes two clutches in the automatic transmission, which selectively transmits rotational force input from the engine to the two input shafts using the two clutches, and is disposed on the two input shafts. The gear is shifted according to the gear ratio of the gear and then output.

Such a dual clutch transmission is attempted to compactly implement a five-speed or higher high speed transmission, and the ASG (Automated) which eliminates manual shifting of the driver by controlling two clutches and a synchronous engagement device in the transmission by a controller. Shift Gear).

Looking at one example of the dual clutch transmission as described above, as shown in Figure 1, it comprises an engine power control means, input means, power transmission means, reverse means, output means.

The engine power control means includes two clutches C1 and C2, and the first and second clutches C1 and C2 are the same as the main input shaft 2 and the main input shaft 2. The first and second rotational powers of the engine ENG are selectively input means via the main input shaft 2 interposed between the input means formed by the first and second input shafts 4 and 6 arranged on the axis. It performs a power interruption function to be transmitted to the input shaft (4) (6).

Of course, the first and second clutches C1 and C2 are controlled by oil pressure supplied from a hydraulic control system controlled by a transmission control unit, not shown, as in the automatic transmission.

In the dual clutch transmission as described above, two or more clutch mechanisms are provided in the manual transmission to be selectively transmitted to two input shafts and configured to output after shifting by using gear ratios of transmission gears disposed on the two input shafts. The shift is automatic.

In such a dual clutch transmission, the engine power is transmitted to the output side through the control of the first clutch C1 and the second clutch C2 as shown in FIG. 2 according to the quick down shift shift request according to the driver's acceleration will. At this time, the engine speed is generated at run-up (A section) at the end of the shift.

At this time, the first clutch C1 is released through slip control at the start of the shift, thereafter, it is controlled to be completely released when the engine speed reaches the target value, and the second clutch C2 is slipped at the start of the shift. Direct control is followed by a direct control after the engine speed reaches the target value.

However, since the second direct connection C2 is delayed by the run-up generated at the end of the shift, the shift time is long, and the run-up causes shock.

Therefore, the present invention was created to solve the above problems, and an object of the present invention is to reduce the engine speed based on the engine speed reduction request signal generated by the shift control unit during downshift. Since it is transmitted to the output side through the control, it is to provide a shift control method of the dual clutch transmission of the vehicle that can eliminate the run-up occurring at the end of the shift and shorten the shift time, thereby improving the shift quality and shift feeling.

In order to realize the above object, the present invention,

Shift control the car's dual clutch transmission,

A shift control method of a dual clutch transmission of a vehicle which transmits the reduced engine speed to an output side through control of the first clutch and the second clutch based on an engine speed reduction request signal generated by the shift control unit during downshift shifting;

The method,

A first step of detecting the acceleration signal of the acceleration sensor for detecting the pressing degree of the accelerator pedal;
Transmitting an engine speed reduction request signal generated by a speed change control unit when an acceleration signal of the acceleration sensor is detected and downshifting is transmitted to an engine control unit;

And transmitting the reduced engine speed in response to the engine speed reduction request signal to an output side through control of first and second clutches.

Here, the method,

Releasing the first clutch through the slip control at the start of the downshift shift, and receiving the engine speed after directly connecting the second clutch through the slip control;

And when the engine speed reaches the target value of the next shift stage, connecting the first clutch completely and releasing the second clutch completely.

In the shift control method of the dual clutch transmission of the vehicle according to the present invention, the engine speed reduced on the basis of the engine speed reduction request signal generated by the shift control unit during downshift shifting is controlled to the output side through the control of the first clutch and the second clutch. Since it is transmitted, the run-up occurring at the end of the shift is eliminated and the shift time is shortened, thereby obtaining an effect of improving shift quality and shift feeling.

DETAILED DESCRIPTION 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 that illustrate preferred embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a view showing a configuration according to the present invention, the vehicle controlling the overall operation of the dual clutch transmission according to the present invention, the acceleration signal supplied from the accelerator pedal 12, and the vehicle speed supplied from the vehicle speed sensor 13 When the signal and the engine speed signal of the engine speed sensor 14 for detecting the engine speed are supplied to the shift control unit (TCU), the TCU determines that a downshift shift is requested based on these multiple signals, and then In response to the downshift shift request, an engine speed reduction request signal is generated to the engine control unit ECU.

Subsequently, according to the engine speed reduction request signal, the engine control unit ECU reduces the engine speed to a set value determined by the engine speed reduction request signal.

In addition, the transmission control unit TCU transmits the engine speed reduced by the engine control unit ECU to the output side through the control of the first clutch C1 and the second clutch C2.

In this case, the control states of the first clutch C1 and the second clutch C2 are as shown in FIG. 3. That is, during downshift shifting, the shift control unit TCU releases the first clutch C1 through slip control and directly controls the second clutch C2 through slip control.

After that, the transmission control unit (TCU) receives the engine speed and determines whether the received engine speed reaches the target value of the next shift stage. When the engine speed reaches the target value, the complete control of the first clutch C1 is completed. Release | release and the said 2nd clutch C2 is connected directly.

In this case, as shown in Figure 3, since the run-up of the engine speed generated at the end of the shift is eliminated, the time of the complete direct connection of the second clutch (C2) is shortened, the overall shift time is shortened.

4 is an operation flowchart for the shift control method of the present invention, first of all, the TCU receives an acceleration signal and a vehicle speed signal through step 101 and then a downshift request based on these signals through step 103. Judge whether or not.

If the downshift is requested as a result of the determination of step 103, the TCU generates an engine speed reduction request signal and transmits it to the engine control unit ECU (step 105), and the engine control unit ECU sets the engine speed. Decreases by.

In addition, the TCU determines whether the shift start time has been reached (step 107), and when the determination result reaches the shift start time, the control unit releases the first clutch C1 through step 109 and the second clutch C2. Control directly. At this time, the control of the first clutch C1 and the second clutch C2 is performed by executing slip control.

Subsequently, the TCU receives the engine speed supplied from the engine speed sensor (step 111), and determines whether the engine speed received through the step 113 reaches a corresponding target value of the next shift stage. When the rotation speed reaches the target value, the process proceeds to step 115.

The TCU completely releases the first clutch C1 and directly connects the second clutch C2 through the step 115.

Accordingly, as shown in FIG. 3, since the run-up generated at the end of the shift is eliminated by the reduction of the engine speed, the shift time of the second clutch C2 is shortened, thereby reducing the overall downshift shift time.

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the invention is indicated by the following claims rather than the above description, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the invention. .

1 is a view showing the configuration of a general dual clutch transmission.

2 is a view showing a configuration according to the present invention.

3 is a waveform diagram showing an output signal of each unit according to the present invention.

4 is a flowchart illustrating a shifting process of the dual clutch transmission according to the present invention.

Description of the Related Art [0002]

11: acceleration sensor

12: vehicle speed sensor

13: engine speed sensor

TCU: Shift Control

ECU: Engine Control Unit

Claims (2)

A first step of detecting the acceleration signal of the acceleration sensor for detecting the pressing degree of the accelerator pedal; Transmitting an engine speed reduction request signal generated by a speed change control unit when an acceleration signal of the acceleration sensor is detected and downshifting is transmitted to an engine control unit; And And transmitting the reduced engine speed in response to the engine speed reduction request signal to an output side through the control of the first and second clutches. The method according to claim 1, wherein the method, Releasing the first clutch through the slip control at the start of the downshift shift, and receiving the engine speed after directly connecting the second clutch through the slip control; And directly coupling the first clutch and completely releasing the second clutch when the engine speed reaches the target value of the next shift stage.

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