KR19980017046A - Shift control method when shift occurs during shift of automatic transmission - Google Patents

Abstract

The present invention relates to a shift control method when a shift occurs during shifting of an automatic transmission, the method comprising: determining whether a traveling vehicle is shifting; Determining whether the shift of the shift stage while driving is in a power-off up shift state; Determining whether the target shift stage is greater than or equal to the set shift stage; Setting a holding time so that a shift does not occur even when the accelerator pedal is operated for a predetermined time; Determining whether the opening amount of the throttle valve is 50% or more; Determining whether the shift state of the shift stage is an upshift shift state; Selecting the target gear stage and returning to the initial stage can prevent frequent shifts caused by the frequent operation of the accelerator pedal, which can prevent shift shock and improve the sense of shift, and improve the durability of the automatic transmission. It works.

Description

Shift control method when shift occurs during shift of automatic transmission

FIG. 1 is a block diagram of a shift control apparatus when a shift occurs during shifting of an automatic transmission according to an embodiment of the present invention.

2 is a (a) and (b) is a shift control pattern when the shift occurs during the shift of the automatic transmission according to an embodiment of the present invention,

3 is a flowchart illustrating a shift control operation when a shift occurs during shifting of an automatic transmission according to an embodiment of the present invention.

The present invention relates to a shift control method when a shift occurs during shifting of an automatic transmission, and more specifically, to the occurrence of shift shock (shock) due to the occurrence of another shift during shifting of the automatic transmission generated due to frequent operation of the accelerator pedal. The present invention relates to a shift control method when a shift occurs during shifting of an automatic transmission in which a shift is not generated for a predetermined time even when frequent accelerator pedal manipulation occurs by setting a predetermined time to fundamentally prevent durability degradation of the automatic transmission.

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. 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 for a beginner.

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

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.

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.

As the driver frequently operates the accelerator pedal while driving, the gear shift stage of the automatic transmission is shifted together according to the operation of the accelerator pedal.

Therefore, in the case of downshift during upshift, upshift during upshift, and downshift during downshift when shifting occurs, shifting to the next shift is completed. .

However, in the above-described conventional technique, if an upshift occurs during downshifting of the shift stage, the holding time before reaching the target shift stage is determined as one due to frequent operation of the accelerator pedal. According to the operation of the accelerator pedal, a shift shock occurs due to frequent change, and there is a problem that the shift characteristic of the automatic transmission is deteriorated.

Accordingly, an object of the present invention is to solve the above-described problems, and when the shift of the shift stage is a power-off shift during power-on down shift, a new holding time is set so that the hold time elapses. In order to provide a shift control method when a shift occurs during shifting of an automatic transmission in which the shift stage is changed to a target shift stage.

The present invention for achieving the above object,

Determining whether a driving vehicle is shifting in progress;

Determining whether the shift of the shift stage is in a power-off up shift and the target shift stage is equal to or greater than the set shift stage;

Setting a predetermined variable and setting a hold time such that a shift does not occur even when the accelerator pedal is operated for a predetermined time;

Determining whether the opening amount of the throttle valve is 50% or more;

Determining whether the shift of the shift stage is in an upshift shift;

It is characterized in that it comprises the step of resetting any set variable set in the above, selecting the target gear stage, and returning to the initial stage.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention that can specifically realize the above objects will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the configuration of the shift control apparatus when a shift occurs during shifting of an automatic transmission according to an embodiment of the present invention,

A vehicle driving state detecting unit 10 determining a driving state of the vehicle and outputting a corresponding signal;

As shown in FIG. 2 by receiving a signal output from the vehicle driving state sensing unit 10, a frequent shift is not allowed to occur due to a hold time so that the shift does not occur for a predetermined time even when the accelerator pedal is frequently operated. A shift control unit 20 for outputting a corresponding duty control signal so as to prevent the;

It consists of a drive unit 30 for fastening the shift stage by controlling the hydraulic pressure in accordance with the duty control signal output from the shift control unit 20.

In the above, the vehicle driving state detection unit 10,

Throttle opening degree detecting means (11) for detecting an opening amount of a throttle valve which is variable according to the operation of the accelerator pedal and outputting a corresponding signal;

Vehicle speed detecting means (12) for detecting a speed of a driving vehicle and outputting a corresponding signal;

The shift pedal detecting unit 13 detects a shift stage that is variable according to the driver's accelerator pedal operating state and the vehicle speed, and outputs a corresponding signal.

According to the above configuration, the operation of the shift control method when the shift occurs during the shift in accordance with an embodiment of the present invention is as follows.

As shown in FIG. 3, when the driver's frequent accelerator pedal is operated in a driving vehicle, the shift control unit 20 performs shifting in the automatic transmission before shifting the shift stage due to the operation of the accelerator pedal. Determine (S100).

If the shift stage is not in the shifting progression in the above determination, it is determined whether the shift progress state of the shift stage is the power-off up shift state by the operation of the driver's accelerator pedal (S110).

When the shift progress state of the shift stage is the power-off up shift state, the target shift stage is set, and it is determined whether the target shift stage is three speeds or more (S120).

When the target shift stage is three speeds or more, the shift stage of the vehicle currently being driven is set to a predetermined setting variable in step S13, so that the output of the duty signal does not vary even if the accelerator pedal changes frequently during a short time. A certain hold time is set (S140).

The shift is generated and the hold time set above is counted while the shift is in progress, and the shift does not occur even if the accelerator pedal is changed during the hold time count.

However, due to the frequent operation of the accelerator pedal, the RPM of the engine may enter the red zone, and when the RPM of the engine enters the red zone, a considerable load of the engine is applied, and even the engine is destroyed. May also occur.

Therefore, in order to prevent the RPM of the engine from entering the red zone, the opening amount of the throttle valve is sensed to determine whether the throttle opening degree is 50% or more (S150), and when the throttle opening degree is 50% or more, the shift state of the shift stage is determined. In operation S160, it is determined whether an upshift state occurs.

Therefore, when the shift of the shift stage is in the upshift state when the throttle opening degree is 50% or more, an arbitrary variable set at 130 is reset (S170), the target shift stage is selected (S180), and the process returns to the initial stage. .

However, when the throttle opening degree is 50% or less in S150 and when the shift state of the shift stage of the S160 is not an upshift state, the output time of the duty control signal output after the shift is set in S140. If it is determined whether the hold time is longer than one hold time (S151), and if the output time of the duty control signal output after shifting is longer than the set hold time, the above-mentioned arbitrary variable is reset and the target shift stage is selected. .

However, if the output time of the duty control signal output after shifting is smaller than the predetermined hold time set above, the hold time is continuously maintained and the duty control signal is output (S152) to return to the initial stage.

In addition, when the shift state of the shift stage is not the power-off up shift state or the target shift stage is 3 steps or less in step S110, the step of selecting the shift stage is continued (S160).

The most preferred embodiments have been described in the above-described embodiments, and the present invention is not limited thereto, and the invention can be easily invented from the above embodiments.

As described above, in the embodiment of the present invention, when downshift occurs during upshift shifting, which is a process in which shifting occurs again when the shift state of the shift stage is in progress, when upshift occurs during upshift shifting, If downshift occurs during shift shifting, select shifting stage to complete shifting and move to the next shifting stage.However, if shifting shifting shifts to power-on-down shifting and sets power-up-up shift during shifting, set a new holding time. By changing the shift stage to the target shift stage after the holding time has elapsed, it is possible to prevent frequent shifts caused by the frequent operation of the accelerator pedal, to prevent shift shock and improve the shifting feeling, and to improve the durability of the automatic transmission. It is possible to provide a shift control method when a shift occurs during shifting of an automatic transmission having an effective effect.

Claims (6)

In the shift control method when the shift occurs during the shift of the automatic transmission, Determining whether a driving vehicle is shifting in progress; Determining whether the shift of the shift stage during driving is a power-off up shift and the target shift stage is greater than or equal to the set shift stage; Setting a hold time so that a shift does not occur even when the accelerator pedal is operated for a predetermined time; Determining whether the opening amount of the throttle valve is 50% or more; Determining whether the shift of the shift stage is in an upshift shift; Resetting the setting variable, selecting the target gear stage after the completion of the shift, and the step of returning to the initial stage, the shift control method when the shift occurs during the shift of the automatic transmission. The method of claim 1, And a step of detecting an opening amount of the throttle valve and determining whether the throttle opening amount is 50% or more when the vehicle in operation is shifting. The method of claim 1, If the shift state of the shift stage is not the power-off up shift state or the target shift stage is smaller than the set shift stage, the shift is performed when the shift occurs during the shift of the automatic transmission including the step of selecting the target shift stage and returning to the initial stage. Control method. The method of claim 1, When the opening amount of the throttle valve is 50% or less and the shift is not completed, determining whether the output time of the duty control signal output after the shift is greater than the hold time; If the output time of the duty control signal output after the shift is greater than the hold time, the predetermined variable is reset, the shift control method when the shift occurs during the shift of the automatic transmission comprising the step of selecting the target shift stage. The method of claim 4, wherein If the output time of the duty control signal output after the shift is smaller than the hold time, the shift control method when the shift occurs during the shift of the automatic transmission, including the step of continuously maintaining the hold time to output the duty control signal and returning to the initial stage. . The method of claim 1, If the opening amount of the throttle valve is 50% or more and the shift state of the shift stage is not an up shift state, determining whether the output time of the duty control signal output after the shift is greater than the hold time described above. Shift control method when shift occurs during shifting.