KR20120069421A - Method for controlling automatic transmission - Google Patents

Abstract

PURPOSE: A transmission control device of an auto transmission is provided to prevent tie up shocks by offering a duty control signal having a control duty value to a shift driving unit. CONSTITUTION: An auto transmission receives a power on up shift change speed signal(101). The auto transmission outputs a corresponding duty control signal of the power on up shift change speed. The auto transmission receives output speed of a gearshift. The auto transmission calculates vehicle acceleration based on the output speed(109). The auto transmission outputs start time point and end time point of torque from the vehicle acceleration and the number of rotation of a turbine.

Description

Transmission Control Method for Automatic Transmissions {METHOD FOR CONTROLLING AUTOMATIC TRANSMISSION}

The present invention relates to a shift control method of an automatic transmission, and more particularly, to a method of preventing shifting and tie up shocks caused by a shifting initial vehicle during power on up shift.

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

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

In the automatic transmission, a torque converter changes a rotational power of an engine, and a corresponding solenoid valve applied from a shift control device is driven according to a driving state of an automobile to achieve valve port conversion of a hydraulic circuit. The hydraulic pressure supplied from the oil pump accordingly controls the operating state of the actuating element for selecting one gear of the gear of the shift gear mechanism.

The friction element, which consists of the clutch and brake, is transferred to the drive gear after the operation of the planetary gear unit is converted to an appropriate transmission ratio according to the selective operation of the friction element.

When the variable power is transmitted to the driver gear, the variable power is transmitted to the driven gear which is geared with the longitudinal reduction gear by the drive gear which is geared with the drive gear to control the rotational movement of the wheel to achieve stable driving. .

In the above-described automatic transmission, when a power on up shift shift occurs, the shift controller outputs a duty control signal corresponding to a power on up shift shift previously set in a memory to the shift driver to perform the shift. do.

However, in the above-described conventional technique, the corresponding duty control signal has a constant control duty value after the initial fill time at the time of power-up shift shift, that is, until the actual shift occurs (that is, just before the inertia phase). Therefore, the difference between the hydraulic pressure required during actual shifting (on Inertia) and the previous hydraulic pressure has often caused a problem of shifting and tie-up short that the vehicle is attracted at the beginning of the actual shift.

The present invention has been proposed to solve the above problems, an object of the present invention is to measure the vehicle acceleration using the output shaft speed of the transmission gear, and the torque phase (torque) using the measured vehicle acceleration mill turbine speed phase) the start time and the end time are calculated, and the duty control signal having a control duty value that is raised by a predetermined value higher than the existing duty value when the calculated torque time reaches a predetermined time calculated from the start time and the end time. The present invention is to provide a shift control method of an automatic transmission that can prevent a shift feeling and a tie-up shock that the vehicle is attracted at the beginning of the shift during power-on-up shift shifting.

Technical means according to the present invention for achieving this object,

a) receiving a power on up shift shifting signal;

b) outputting a corresponding duty control signal of the power on up shift shift set in the memory;

c) receiving an output shaft speed of the transmission gear when an initial fill time has elapsed according to the corresponding duty control signal, and calculating vehicle acceleration based on the received output shaft speed;

d) outputting a starting time point and an ending time point on the torque from the vehicle acceleration and the turbine speed calculated in step c);

e) calculating a predetermined time point on the basis of the starting time point and the ending time point of the torque and having a duty value which is increased by a predetermined value higher than the duty value of step b) at the starting time point and the predetermined time point of the torque; Outputting a signal.

The starting point of the torque phase in step e) is a time point at which the vehicle acceleration is differentiated by differentiating the vehicle acceleration, and the end time point of the torque phase is a time point at which the turbine rotation speed is bent.

The predetermined time point is characterized in that it is halfway between the starting point and the ending point of the torque phase.

As described above, the shift control method of the automatic transmission according to the present invention includes calculating the vehicle acceleration using the output shaft speed of the transmission gear, and starting time of a torque phase calculated from the calculated vehicle acceleration and the turbine speed. When a predetermined time calculated from the end time is reached, a shift control signal having a control duty value which is raised by a predetermined value higher than a preset duty value in the memory is provided to the shift drive unit, so that the shifting feeling and the tie-up shock at which the vehicle at the beginning of the shift is attracted. Get the effect that can prevent.

1 is a view showing the configuration of an automatic transmission to which the present invention is applied.
FIG. 2 is a waveform diagram illustrating output signals of respective units shown in FIG. 1.
3 is a flowchart illustrating a shift control process of an automatic transmission according to the present invention.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention in detail.

1 is a block diagram illustrating a shift control apparatus of an automatic transmission for a vehicle to which an embodiment of the present invention is applied. As shown in FIG. 1, a shift control apparatus of an automatic transmission to which the present invention is applied includes a vehicle driving state sensing means 10 that receives a signal that is variable and output according to a driving state of a vehicle and outputs a corresponding signal; When the vehicle receives the signal output from the vehicle driving state detecting means 10 and the vehicle receives the power-on-up shift shifting signal, the vehicle acceleration is measured using the output side speed of the shifting gear, and the measured vehicle acceleration and turbine rotation are measured. Shift control for controlling the control duty value to be raised by a predetermined value than the existing control duty value for increasing the hydraulic pressure at this predetermined time when the predetermined time calculated from the starting point and the ending point of the torque phase is reached using the number. A shift for synchronizing the shift stage to the target shift stage by receiving a signal output from the means 20 and the shift control unit 20 It consists of a drive unit 30

Here, the vehicle driving state detection means 10, the throttle valve opening degree detection unit 11 for detecting the opening degree of the throttle valve whose opening and closing state is variable in conjunction with the operation state of the accelerator pedal and outputs a corresponding signal, and the vehicle Output shaft speed detection unit 12 for detecting output shaft speed that outputs different values according to the engagement state of the transmission gear, and if the gear stage is varied according to the throttle valve opening amount and the vehicle speed, the variable state of the gear stage is detected. A shift stage detection unit 13 for outputting a corresponding signal, an engine speed detection unit 14 for detecting a rotational speed of a crankshaft variable according to an operating state of the engine, and outputting a corresponding signal; Turbine rotation speed detection unit 15 for detecting the rotational speed of the turbine shaft of the torque converter connected to the input shaft and outputs a corresponding signal. Here, the output shaft speed detector 12 is usually provided as a speed sensor.

The shift control unit 20 is powered on from the shift stage detecting unit 13 which generates the shift signal based on the signals supplied from the throttle valve opening degree detecting unit 11 and the engine speed detecting unit 14. When the shift time signal is received and the fill time after the oil pressure is filled in the flow path passes, the output shaft speed of the output shaft speed detector 12 is provided to calculate the acceleration of the vehicle. Subsequently, the shift control unit 20 calculates an inflection time point of the vehicle acceleration by differentiating the calculated vehicle acceleration. Meanwhile, the shift control unit 20 receives the turbine rotational speed of the turbine rotational speed detecting unit 15 to calculate the inflection time of the turbine rotational speed. The shift control unit 20 calculates the starting point and the end point of the torque phase at which the damper clutch (not shown) starts to move based on the calculated inflection time of the vehicle acceleration and the inflection time of the turbine speed. And a predetermined time point is calculated from the calculated starting point and ending point of the torque phase, and when the predetermined time point is reached from the calculated starting point of the torque phase, the control duty value is increased by a predetermined value from the duty value set in the memory. It outputs to the transmission drive part 30 as a duty control signal which has a.

FIG. 2 is a graph showing output signals of the respective parts of the automatic transmission shown in FIG. 1. A) is a graph showing a power-on upshift shifting signal of the shift stage detecting unit 13, and B) is a vehicle. It is a graph which shows the derivative value of acceleration, C) is a graph which shows the turbine speed, and D) is a signal which shows the duty control signal at the time of power-up upshift.

Vs_grd shown is a vehicle acceleration, Ta is a starting point of torque phase which is an inflection point calculated by differentiating the vehicle acceleration, and Tb is a ending point of torque phase which is a shift point of the turbine speed. The illustrated Tr is a predetermined time point calculated from the start time Ta and the end time Tb on the torque, and is normally calculated as Tr = (Tb-Ta) / 2. The illustrated Ft is a time when the duty value is controlled to 100% at fill time so that the hydraulic pressure is completely filled in the flow path.

Therefore, when the predetermined time Tr is reached from the starting point Ta of the torque phase, the shift control unit 20 generates a control duty signal having a control duty value that is increased by a predetermined value than the control duty value set in the memory. The control duty signal is powered on and upshifted on the basis of the shift driver 30.

3 is a flowchart illustrating a shift control method of an automatic transmission according to an embodiment of the present invention. The same parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The shift control unit 20 receives a power on up shift shift signal generated by the shift stage detecting unit 13 and the engine speed 14 (step 101), and performs power on up shift through the step 101. When the shift signal is received, the duty control signal set in the memory is output (step 103), and it is checked whether the fill time (Ft) for which the hydraulic pressure fills the flow path has elapsed (step 105).

When the fill time Ft has elapsed through the step 105, the shift controller 20 receives the output shaft speed of the output shaft speed detector 12 (step 107) and based on the received output shaft speed, The acceleration is calculated (step 109).

Here, since the process of calculating the vehicle acceleration based on the output shaft speed is a known technique, a detailed description thereof will be omitted.

Subsequently, the shift control unit 20 differentiates the vehicle acceleration calculated through the step 109 to calculate a torque phase start time Ta that is an inflection point of the vehicle acceleration based on the derivative value (step 111).

In addition, the transmission control unit 20 receives the turbine rotational speed supplied from the turbine rotational speed detecting unit 15 (step 113), and then calculates the torque phase end time Tb, which is an inflection point of the received turbine rotational speed. (Step 115), the torque phase start time Ta and the torque phase end time Tb are calculated from the steps 111 and 113, and the predetermined time point Tr which is the middle of the torque phase area according to the calculation result. (Step 117).

The shift control unit 20 sets the preset duty value Da% set in the step 103 to a predetermined value (Δda%) when the predetermined time Tr is reached after the torque phase start time Ta elapses. The duty control signal having the duty value increased by the output value is output (step 119). Here, the predetermined value (Δda%) and the predetermined time point (Tr) are the results obtained at the optimum values through the predetermined experiment results.

As described above, the shift control method of the automatic transmission according to the present invention is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiment, and the present invention is claimed in the following claims. Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made.

The vehicle acceleration is calculated using the output shaft speed of the transmission gear and the duty value set in the memory is reached when a predetermined time calculated from the starting and ending torque phase calculated from the calculated vehicle acceleration and the turbine speed is reached. By providing a duty control signal having a control duty value increased by a predetermined predetermined value to the shift drive unit, the shift control method of the automatic transmission that can prevent shifting and tie-up shock that the vehicle is attracted at the beginning of shifting is very efficient in terms of efficiency. It is an invention with industrial applicability because it can bring about great progress, and the possibility of commercialization or sales of the applied vehicle is not only sufficient, but also practically obvious.

Claims (3)

a) receiving a power on up shift shift signal;
b) outputting a corresponding duty control signal of the power on up shift shift set in the memory;
c) receiving an output shaft speed of the transmission gear when an initial fill time has elapsed according to the corresponding duty control signal, and calculating vehicle acceleration based on the received output shaft speed;
d) outputting a start time and an end time of the torque phase from the vehicle acceleration and the turbine speed calculated in step c); And
e) a duty control having a predetermined time point calculated on the basis of the starting time point and the ending time point of the torque, and having a duty value which is increased by a predetermined value, which is higher than the duty value of step b) at the starting time point and the predetermined time point of the torque; The shift control method of an automatic transmission comprising the step of outputting a signal. The shift of the automatic transmission according to claim 1, wherein the starting point on the torque of the step e) is a time point at which the vehicle acceleration is differentiated by differentiating the vehicle acceleration. Control method. The shift control method of an automatic transmission according to claim 2, wherein the predetermined time wja is an intermediate point of the end point of the starting point of the torque phase.

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