KR19980047956A - Shift control method of automatic transmission - Google Patents

Abstract

The present invention relates to a shift control method of an automatic transmission, wherein the time from the point (SS) at which the shift start command outputted from the shift control means when the D range is converted from the initial N range of the shift lever to the actual shift start point (SB) ( Detects Ta) and compares the target time Tao to calculate an error, finds the fill time correction value in the fill time correction map, corrects the fill time, and starts the RPM of the turbine after the actual shift start point SB. Detects and calculates (Nt) for 4 operation cycles, and thus the rate of change of the RPM of the turbine (△ ) To calculate the target rate of change ( After the error is detected and the correction duty map is set in the correction duty map in the memory, the correction duty value is learned. By acting on the initial duty value calculation step, the response of the shift stage is improved when changing the D range or R range from the N range of the shift lever, and the response of the shift stage is kept constant during the fill time control, and the N range of the shift lever It is effective to improve the shifting feeling when converting the D range or the R range at.

Description

Shift control method of automatic transmission

The present invention relates to a shift control method of an automatic transmission, and more particularly, when the shift lever is converted from the N range to the D range or from the N range to the R range, the shift of the shift stage is shifted to a shift or hydraulic deviation of the automatic transmission ( The present invention relates to a shift control method of an automatic transmission for preventing shift shock caused by a slow or fast response.

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 controller so that the shift gear according to the operating state of the vehicle can be operated. Hydraulic pressure acts on the valve to allow shifting.

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 by a beginner.

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

The selective operation of the friction element consisting of a clutch or a brake switches the operation of the planetary gear unit, 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.

As described above, the target shift stage is determined according to the driving state of the vehicle, and when the control operation to the determined target shift stage is executed, the corresponding friction element is operated for each target shift stage among friction elements consisting of a clutch or a brake. Let's do it.

In order to drive a vehicle equipped with an automatic transmission that performs the above operation, the driver converts the shift lever from the N range where the shift stage is neutral to the D range which is the driving stage shift speed or the R range which is the reverse traveling shift stage. It was.

However, the above-described conventional technology has a problem that a shift shock occurs when the shift stage shift response is slow or faster when the shift lever is changed from the N range to the D range or the R range due to the deviation and the hydraulic deviation of the automatic transmission.

Therefore, in order to solve the above-mentioned conventional problem, as shown in FIG. 1, the actual shift start point is started from the point of time (SS) at which the shift start command output from the shift control device is issued when the D range is converted at the initial N range of the shift lever. Detects the time Ta up to SB and compares the target time Tao to calculate an error, finds the fill time correction value in the fill time correction map, corrects the fill time, and starts the actual shift start point ( After SB), the RPM (Nt) of the turbine is detected and calculated for 4 operation cycles, and the RPM change rate of the turbine (△ ) To calculate the target rate of change ( After the error is detected and the correction duty is set in the correction duty map in the memory not shown in the figure, the correction duty is learned. By applying the value to the calculation step of the initial duty value calculation, the response of the shift stage is improved when the N range of the shift lever is converted to the D range or R range, and the response of the shift stage is kept constant during the fill time control. It is to provide a shift control method of an automatic transmission having an effect of improving the shifting feeling when converting from the N range to the D range or the R range.

The present invention for achieving the above object;

Determining whether the shift lever is converted from the N range to the D range;

When the shift lever is converted from the N range to the D range, determining whether the actual fill time time is greater than or equal to the preset fill time time Tf;

If the actual fill time time is greater than or equal to the preset fill time time Tf, the initial duty value, the duty gradient, the duty output time, and the like stored in the map of the memory are set. Outputting a duty control signal according to a set value;

Detecting the RPM of the turbine from the point of time at which the shift start command is output as the duty control signal is output (S.S) and determining a point where the RPM (Nt) of the turbine becomes the maximum RPM-20 of the turbine;

When the speed (Nt) of the turbine, which has detected the RPM of the turbine, reaches a point at which the maximum turbine RPM-20 is reached from the point of time (SS) at which the shift start command is output, the shift control means 20 sets a preset time. Calculating an error by calculating the Ta and the detected time Ta by a set arithmetic expression;

The error calculated above is set by the fill type correction value Tfo in the fill time correction map of the memory to calculate the calculated fill time value Tf and the fill time value Tf to be controlled by the set arithmetic expression. Making a step;

After the shift start point (SS), the RPM of the turbine is measured by calculating the arithmetic formula (N1, N2, N3, N4) for 4 operation cycles and calculating the RPM change rate (△) Calculating c);

RPM change rate of the turbine during the four operation cycles above (△ ), The rate of change of the preset target turbine ( And calculating an error value by calculating the calculated arithmetic expression, and finding and learning a correction duty Dic corresponding to the error value in the duty correction map of the memory using the calculated error value. It is characterized by.

1 is a shift control pattern of an automatic transmission according to an embodiment of the present invention,

2 is a block diagram of a shift control apparatus of an automatic transmission according to an embodiment of the present invention;

3 is a flowchart illustrating a shift control method of an automatic transmission according to an embodiment of the present invention;

4 is a fill time correction graph in shift control of an automatic transmission according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention, which can be achieved and realized in detail by the above objects, will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a configuration of a shift control apparatus of an automatic transmission according to an embodiment of the present invention is provided;

A vehicle operation state detecting means (10) for receiving a signal that is varied in the state of the vehicle and outputs a corresponding electric signal according to an operation state of the vehicle;

The actual shift start point (SB) starts from a point (SS) at which the shift start command output from the shift control device is issued when the D range is converted from the initial N range of the shift lever by reading and receiving a signal output from the vehicle operation state detecting means (10). Detects the time Ta up to) and compares the target time Tao to calculate an error, finds the fill time correction value Tfo in the fill time correction map, and corrects the fill time Tf. After the start of the shift (SB), the RPM (Nt) of the turbine is detected for 4 calculation cycles and calculated, and accordingly, the RPM change rate of the turbine ) To calculate the target rate of change ( After calculating the error, the error is detected and the correction duty is set in the correction duty map of the memory not shown in the figure.Then, the initial duty value is calculated when the D range or the R range is converted at the N range of the next shift lever. The shift control means 20 is applied to.

In the above, the vehicle operating state detection means (10);

A throttle valve opening degree detection unit 11 for detecting an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of the accelerator pedal and outputting a corresponding signal;

A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal;

A shift stage sensing unit 13 configured to detect a variable state of the shift stage and output a corresponding signal when the shift stage is changed according to the throttle valve opening amount and the vehicle speed;

An engine rotation speed detection unit 14 for detecting a rotation speed of the crankshaft which is varied according to an operating state of the engine and outputting a corresponding signal;

A turbine shaft rotational speed sensing unit 15 for sensing a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal;

The shift lever detection unit 16 detects that the shift lever position is changed by the driver and outputs a corresponding signal.

The present invention is applied to all when the shift lever is converted from the N range or P range to the D range or R range, but will be described here by taking an example of converting from the N range to the D range.

As the driver changes the shift lever to drive the vehicle, the shift control means 20 determines whether the shift lever is converted from the N range to the D range (S100).

In the case where the shift lever is converted from the N range to the D range, the shift control means 20 determines whether the actual fill time time is greater than or equal to the preset fill time time Tf (S110). ).

When the actual fill time time (T) is greater than or equal to the preset fill time time (Tf), the shift control means 20 determines the initial duty value, the duty gradient, and the duty output time stored in the map of the memory. And the like, and outputs a duty control signal according to the value set above (S120).

As the duty control signal is output in the above, the shift control means 20 detects the RPM of the turbine from the point of time (SS) at which the shift start command is output, and determines the point where the RPM (Nt) of the turbine becomes the maximum RPM-20 of the turbine. Determine (S130).

That is, the determination step is a determination step for the shift control means 20 to detect the time Ta from the shift start command S.S after the shift start command output (S.S) to the actual shift start point S.B.

Therefore, when the speed of the turbine (Nt) detected the RPM of the turbine reaches the point of the maximum turbine RPM-20 from the time (SS) when the shift start command is output in the above, the shift control means 20 is a preset An error is calculated by calculating the time Ta and the detected time Ta by the set arithmetic equation (S140).

(Error = preset time (Tao) + detected time (Ta))

As shown in FIG. 4 attached to the fill time correction map of the memory, the calculated error is calculated by controlling the fill time value Tf and the calculated arithmetic expression by setting the fill type correction value Tfo. The peel time value Tf is calculated (S150).

(Fill time value to be controlled (Tf) = pre-calculated fill time value (Tf) + fill type correction value (Tfo))

In addition, the shift control means 20 calculates the RPM of the turbine after the shift start point (SS) for four calculation cycles by calculating the arithmetic formula set by the calculation (N1, N2, N3, N4) (△) ) Is calculated (S170).

RPM change rate of the turbine in the above (△ ) Is calculated as follows.

The RPM value N2 of the second calculation cycle turbine among the RPM N1, N2, N3, N4 of the turbine measured during the four calculation cycles is divided by 2 by adding the RPM value N3 of the third calculation cycle turbine to the first value. The change rate of the first turbine is obtained by dividing the RPM value N1 of the calculation cycle turbine by the 2 divided by the RPM value N2 of the second calculation cycle turbine. ) Is calculated, the RPM value N3 of the third calculation cycle turbine is divided by two by adding the RPM value N4 of the fourth calculation cycle turbine, and the RPM value N2 of the second calculation cycle turbine is divided by two. The change rate of the second turbine by dividing by 2 plus the RPM value N3 of the turbine ( By calculating and subtracting), the RPM change rate of the turbine for four operation cycles after the start of the shift (SS) is calculated. ) Can be calculated.

Therefore, the shift control means 20 is the rate of change of the RPM of the turbine during the four operation cycles (△) ), The rate of change of the preset target turbine ( And an error value is calculated by using a set arithmetic expression, and the error value calculated above is found and learned from the duty correction map corresponding to the error value in the duty correction map of the memory (S190).

The duty value learned above is applied to the initial duty value calculation calculation step when the duty value is generated after the D range conversion in the N range as described above.

(Initial Duty (Di) = Initial Duty (Di)-Learning Saved Calibration Duty (Dic) + Temperature Calibration Duty (Dt)

The above embodiments are described as the most preferred embodiments, and the present invention is not limited thereto, and the embodiments can be easily described from the above embodiments.

As described above, in the embodiment of the present invention, the time Ta from the time point at which the shift start command output from the shift control device is issued from the initial N range of the shift lever to the D range is given to the actual shift start point SB is detected. Comparing the target time Tao to calculate an error, find the fill time correction value in the fill time correction map, correct the fill time, and adjust the RPM (Nt) of the turbine after the actual shift start point (SB). Detects and calculates during 4 operation cycles ) To calculate the target rate of change ( After the error is detected and the correction duty is set in the correction duty map in the memory not shown in the drawing, the correction duty is learned. By applying the value to the calculation step of the initial duty value calculation, the response of the shift stage is improved when the N range of the shift lever is converted to the D range or R range, and the response of the shift stage is kept constant during the fill time control. It is possible to provide a shift control method of an automatic transmission having an effect of improving a shift feeling when converting an N range to a D range or an R range.

Claims (4)

Determining whether the shift lever is converted from the N range to the D range; When the shift lever is converted from the N range to the D range, determining whether the actual fill time time is greater than or equal to the preset fill time time Tf; If the actual fill time time is greater than or equal to the preset fill time time Tf, the initial duty value, the duty gradient, the duty output time, and the like stored in the map of the memory are set. Outputting a duty control signal according to a set value; Detecting the RPM of the turbine from the point of time at which the shift start command is output as the duty control signal is output (S.S) and determining a point where the RPM (Nt) of the turbine becomes the maximum RPM-20 of the turbine; When the speed (Nt) of the turbine, which has detected the RPM of the turbine, reaches a point at which the maximum turbine RPM-20 is reached from the point of time (SS) at which the shift start command is output, the shift control means 20 sets a preset time. Calculating an error by calculating the Ta and the detected time Ta by a set arithmetic expression; The error calculated above is set by the fill type correction value Tfo in the fill time correction map of the memory to calculate the calculated fill time value Tf and the fill time value Tf to be controlled by the set arithmetic expression. Making a step; After the shift start point (SS), the RPM of the turbine is measured by calculating the arithmetic formula (N1, N2, N3, N4) for 4 operation cycles and calculating the RPM change rate (△) Calculating c); RPM change rate of the turbine during the four operation cycles above (△ ), The rate of change of the preset target turbine ( And calculating an error value by calculating the calculated arithmetic expression, and finding and learning a correction duty Dic corresponding to the error value in the duty correction map of the memory using the calculated error value. Shift control method of an automatic transmission, characterized in that. The reason for judging the point at which the RPM (Nt) of the turbine becomes the RPM-20 of the maximum turbine according to claim 1, A shift control method for an automatic transmission comprising a step of detecting a time Ta from the shift start command output (S.S) to the actual shift start point (S.B). The method according to claim 1, wherein the RPM change rate of the turbine (△ ) To calculate The RPM value N2 of the second calculation cycle turbine among the RPM N1, N2, N3, N4 of the turbine measured during the four calculation cycles is divided by 2 by adding the RPM value N3 of the third calculation cycle turbine to the first value. The change rate of the first turbine is obtained by dividing the RPM value N1 of the calculation cycle turbine by the 2 divided by the RPM value N2 of the second calculation cycle turbine. ) Is calculated, the RPM value N3 of the third calculation cycle turbine is divided by two by adding the RPM value N4 of the fourth calculation cycle turbine, and the RPM value N2 of the second calculation cycle turbine is divided by two. The change rate of the second turbine by dividing by 2 plus the RPM value N3 of the turbine ( By calculating and subtracting), the RPM change rate of the turbine for four operation cycles after the start of the shift (SS) is calculated. The shift control method of the automatic transmission, characterized in that it comprises a) that can be calculated. The method according to claim 1, The learned duty value is applied in the initial duty value calculation calculation step when the duty value is generated after the D range conversion in the N range as described above. (Initial Duty (Di) = Initial Duty (Di)-Learning Saved Calibration Duty (Dic) + Temperature Correction Duty (Dt))