KR100273589B1 - Transmission control device - Google Patents

Abstract

PURPOSE: A shift control method from a neutral step to a drive step is provided to improve the response property and to reduce a shifting time. CONSTITUTION: A controller of neutral to drive gear shift comprises a gearshift lever position detecting unit(11) to output a corresponding signal according to a position of a gearshift lever; a rotating number detecting unit(12) to calculate a traveling speed of a vehicle by outputting a corresponding signal according to a rotating speed of an output shaft; and a shift control unit(2) to output a control signal to a corresponding control device for initially starting the vehicle by converting to two step after shifting to one step when the gearshift lever is converted from a neutral lever to a drive lever. In converting the gearshift lever from a neutral lever to a drive lever, the traveling speed of the vehicle is calculated by reading a signal from a speed detecting device. The vehicle is initially started by shifting to the two step after shifting to the one step when the detected speed is slower than a set speed. Otherwise, a common gear shift is performed.

Description

N → D shift control device and method of automatic transmission

1 is a diagram showing the state change at the time of N → D shift control of a conventional automatic transmission.

2 is a block diagram of an N → D shift control apparatus of the present invention automatic transmission.

3 is an operation flowchart of an N-> D shift control method of the automatic transmission of the present invention.

4 is a diagram showing the change in each state in the N → D shift control of the automatic transmission of the present invention.

The present invention relates to an automatic shift control method, and more particularly, to an automatic transmission that reduces shift delay time and reduces shift shock when changing the shift state from the neutral stage N stage to the driving stage D stage. N to D shift control apparatus and method thereof.

In general, a vehicle equipped with an automatic transmission controls the hydraulic pressure within a shift range set according to the driving speed of the vehicle so that the shift gear of the target shift stage may be automatically operated.

Therefore, the torque converter is operated according to the output power of the engine to control the rotational force of the fluid, and according to the control signal applied from the shift control device so that the shift gear according to the operating state of the vehicle can be operated. The hydraulic pressure acts on the valve so that the shifting operation can be performed.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure does not require the operation of a clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. The engine stall can be reduced due to the driver's malfunction or immaturity of the driver while driving, and thus the driving operation can be facilitated even for a beginner.

Therefore, the automatic transmission receives a fluid pressure from the oil pump by changing the port according to the selected position of the driver's shift lever, and the operating state of the hydraulic valve is changed by the fluid pressure so that any one gear stage of the transmission gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element to select the stage.

The action of the planetary gear arrangement is switched in accordance with the selective operation of the friction element consisting of a clutch or brake, which is then transmitted to the drive gear after an appropriate transmission ratio is made.

When the shifted power is transmitted to the drive gear, the shifted power is transmitted to the driven gear geared to the longitudinal reduction gear by the driven gear geared to the drive gear, thereby controlling the rotational movement of the wheel.

To perform the shifting operation to the target shifting stage as described above for the automatic transmission which is operated by the shifting operation to the target shifting stage set according to the position of the shifting lever whose position is changed by the driver and the driving state of the vehicle as described above. For each target shift stage, a plurality of friction elements including a clutch or a brake device in which the operating state is changed in the state of hydraulic pressure supplied or released are incorporated.

Therefore, the hydraulic supply or release operation is executed to change the operation state to the state of the friction element that is already set for each set target shift stage.

When the driver for the driving operation of the driver changes the position of the shift lever from the N stage, which is the neutral stage, to the D stage, which is the driving stage, a control operation for preventing a shift shock that occurs.

When the position of the shift lever is changed from the N stage to the D stage as shown in (a) of FIG. 1, the automatic shift control signal converts a shift control signal into a signal corresponding to two shifts of the first and second shift control solenoid valves. To prevent accidents due to sudden start.

As described above, when the target shift stage is set in two stages, and the shift operation from the N stage to the D stage occurs, the operating elements are a rear clutch used as an input element and a kick down brake used as a reaction force element.

Therefore, in order to operate the rear clutch, the duty by the automatic shift control device according to the state of the ND control valve in which the state of the valve changes according to the position of the shift lever when the position of the shift lever is changed from the N stage to the D stage. The control pressure generated by the operation of the controlled pressure control solenoid valve is supplied to the rear clutch.

When the shift operation to the D stage using the shift lever is completed, the state of the N-D control valve is completely switched to the D stage state, so that the operating state of the rear clutch can be controlled by the line pressure generated in the oil pump.

On the other hand, the supply pressure S / A of the kick-down brake is directly supplied with line pressure and the operation state is changed.

As described above, the rear clutch and the kick-down brake controlled by the action of each control pressure or line pressure first control the operation of the kick-down brake for selecting the reaction force element, and then the operation of the rear clutch for providing the input element. To control.

Therefore, the hydraulic state diagram as shown in (c) of FIG.

Therefore, as shown in (b) of FIG. 1, the control pressure generated by the duty control for controlling the rear clutch does not work in the section A until the operating pressure of the initial rear clutch is completely filled to a proper state. Pressure is supplied.

Therefore, line A is simultaneously supplied to the rear clutch and the kick-down brake in section A.

In addition, since the rear clutch has a very large volume in structure, it takes a long time from the start of the initial operation to the completion of the structure, and the rear pressure is distributed and supplied by the action of the kick-down brake. The time required until the fluid required for the operation of the clutch is completely supplied is increased.

Therefore, since a quick shifting operation of the rear clutch is not performed, a problem arises in that the response of the operation is slow and a lot of shifting time is required.

Therefore, the object of the present invention is to change the position of the shift lever from the N stage to the D stage for the driving operation, and then execute the control operation for the first speed for a predetermined time, and then execute the second speed control so that the hydraulic pressure is applied to the rear clutch. The present invention provides a method for controlling the N → D shift of an automatic transmission, which can shorten the time until all are activated, thereby improving the responsiveness of the operation and shortening the shift time.

The present invention for achieving the above object is a step of reading the signal output from the shift lever position detecting means, and determining whether the position of the shift lever is converted from the N stage to the D stage; Calculating the traveling speed of the vehicle by reading a signal output from the vehicle speed detecting means when the position of the shift lever determined in the step is changed from the N stage to the D stage; Comparing and determining the traveling speed calculated in the step with the set traveling speed; If the running speed of the vehicle compared and determined in the above step is slower than the set speed, the control signal for performing the initial start operation of the car by performing the shifting operation to the first stage during the corresponding time and then shifting to the second shifting state. It characterized in that the step of outputting to the control device.

Hereinafter, the most preferred embodiments will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an N → D shift control apparatus of an automatic transmission according to an embodiment of the present invention, and FIG. 3 is an operation flowchart of an N → D shift control method of an automatic transmission according to an embodiment of the present invention. FIG. 7 is a view illustrating a change in each state during N → D shift control of an automatic transmission according to an exemplary embodiment of the present invention, wherein a shift lever position detection unit outputs a signal having a corresponding state according to a position of a shift lever whose position is changed by a driver ( 11) and an output shaft rotation speed detection unit 12 for outputting an electric signal in a corresponding state according to the rotation speed of the output shaft of the automatic transmission to calculate the traveling speed of the vehicle, and the shift lever position detection unit 11. And the second gear shifting operation to the first gear during the corresponding time when the shift lever position is changed from the N gear which is the neutral gear to the D gear which is the driving gear by reading the signal output from the output shaft rotation speed sensing unit 12. Turns into Is switched to a state consists of a shift control unit (2) for outputting a control signal to be the initial starting operation of the vehicle to the control unit.

The operation of the present invention made as described above is as follows.

First, when power required for the operation of each device is applied, the corresponding operation is executed.

Therefore, the shift control unit 2 reads the signal output from the shift lever position detecting unit 11 (S11), and determines the position of the current shift lever (S12).

When the determined shift lever position is changed from the N stage, which is the neutral stage, to the D stage, which is the driving stage, as shown in Fig. 4A, the shift control operation for the initial driving operation is executed.

However, if the determined shift lever position is not shifted from the N stage to the D stage, the process returns to the first stage (S11).

Next, a shift control operation during initial driving will be described.

When the position of the shift lever is changed from the N stage to the D stage as described above, the shift control unit 2 reads a signal output from the output shaft rotation speed detection unit 12 (S13), and calculates the current driving speed of the vehicle. (S14).

At this time, the output shaft rotation speed detection unit 12 is a disk having a predetermined size slot which rotates in association with the rotation speed of the output shaft of the transmission, and is mounted on the upper and lower ends of the disk using a light receiving / light emitting device As the rotational speed of the disc changes according to the driving speed of the car, the driving speed of the car can be calculated using a photo sensor using the light sensor, the operation state of which is changed by the light received through the slot formed in the disc. To help.

In addition, it is possible to calculate the driving speed of the vehicle by using the output period of the voltage induced according to the rotational speed of the output shaft using a magnetic field sensor with a permanent magnet.

As described above, the shift control unit 2 that reads a signal output from a photo sensor or a magnetic field sensor in which the state of the output signal changes according to the rotational speed of the output shaft of the automatic transmission may use each arithmetic expression or data set previously. The running speed of the corresponding car is calculated.

When the driving speed of the vehicle is calculated through the above-described method, the shift control unit 2 compares and determines the previously set speed (S15).

Therefore, when the driving speed of the comparison vehicle is faster than the set speed, the shift control unit 2 allows to control the shift operation of the automatic transmission in a conventional manner (S16).

However, when the running speed of the car that is judged to be compared is slower than the set speed, the shift control unit 2 moves to the first speed during the fill time A 'of FIG. 4C where the hydraulic pressure required for the operation of the rear clutch is completely filled. In order to execute the shift operation, a control signal of a corresponding state is output to the corresponding control device (S17, S18).

In order to execute the shift control operation at one speed during the fill time A ', the shift control section 2 uses a timer (not shown) provided inside or outside.

When the set fill time A 'elapses, the shift control unit 2 executes a control operation capable of executing the shift operation at the second speed in a normal control method (S19).

When the shifting operation to the first shift speed is performed as described above, the actuating element at the first speed becomes the one-way clutch to select the input element and to provide the rear clutch and the reaction force element.

Therefore, since the line pressures supplied to operate the rear clutch and the kick-down brake at the second speed control are supplied to operate only the rear clutch, the hydraulic state of the initial rear clutch rapidly increases as shown in (d) of FIG. The time A 'is shortened.

Therefore, by shortening the fill time A ', the overall operating time of the rear clutch requiring a lot of operating time can be shortened, so that an effect of improving the response of the operation occurs.

Claims (2)

Reading a signal output from the shift lever position detecting means to determine whether the position of the shift lever is changed from the N stage to the D stage; Calculating the traveling speed of the vehicle by reading a signal output from the vehicle speed detecting means when the position of the shift lever determined in the step is changed from the N stage to the D stage; Comparing and determining the traveling speed calculated in the step with the set traveling speed; If the running speed of the vehicle compared and determined in the above step is slower than the set speed, after performing the shifting operation to the first stage during the corresponding time, it is converted to the second shifting state to the control signal so that the initial starting operation of the vehicle is performed. N → D shift control method of an automatic transmission comprising a step of outputting to a control device. And performing a normal shift control operation according to a driving state of each vehicle when the traveling speed of the vehicle that is determined to be compared in the step of comparing the driving speed with the set traveling speed is faster than the set speed. N → D shift control method of the automatic transmission characterized in that.