KR100308978B1 - Method for controlling power-off manual fourth-second-fourth shifting of automatic transmission - Google Patents

Abstract

PURPOSE: A method for controlling power-off manual fourth-second-fourth shifting of an automatic transmission is provided to improve a traveling experience and a shifting feeling by preventing the generation of a shifting shock. CONSTITUTION: A method for controlling power-off manual fourth-second-fourth shifting of an automatic transmission comprises the steps of deciding the output of a power-off second to fourth skip-up shift control request signal(S100), reducing an end clutch release control duty if the power-off second to fourth skip-up shift control request signal is outputted while a change lever is shifted from the drive range to the second range and right after from the second range to the drive range(S110-S130), and outputting an initial duty for returning to power-off second to fourth up-shifting if a predetermined time is elapsed and performing a rub-routine for controlling power-off second to fourth skip-up shifting(S140-S160).

Description

Power Off Manual for Automatic Transmission 4 → 2 → 4 Shift Control Method

The present invention relates to a power-off manual 4 → 2 → 4 shift control method for an automatic transmission. More specifically, the driver may vary the shift lever from the D range to the 2 range without depressing the accelerator pedal during four speed driving. The present invention relates to a power-off manual 4 → 2 → 4 shift control method of an automatic transmission to prevent shift shock caused by immediately shifting the shift lever to the D range.

In general, a vehicle equipped with an automatic transmission may be operated by automatically shifting the transmission gear to a target shift stage by controlling oil pressure within a shift range set according to the traveling speed of the vehicle and the opening amount of the throttle valve.

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

In the automatic transmission, the torque converter changes the rotational power of the engine, and the solenoid valve is controlled by a control signal applied from the shift control device according to the driving state of the vehicle so that the corresponding friction element is operated. A hydraulic circuit is formed to execute automatic shifting operation.

Therefore, the automatic transmission outputs a control signal corresponding to the driver's shift lever selection position, the vehicle speed, and the opening amount of the throttle valve, and the corresponding solenoid valve is driven by the output signal to change the valve port of the hydraulic circuit. And thereby control the operating state of the actuating friction element for selecting one of the gear stages of the gear stage of the transmission gear mechanism by the hydraulic pressure supplied from the oil pump.

The friction element consisting of the clutch and the brake is transferred to the drive gear after the operation state of the planetary gear device is switched according to the selective operation of the friction element, which is changed to an appropriate transmission ratio.

When the variable power is transmitted to the drive gear, the variable power is transmitted to the driven gear which is geared with the longitudinal reduction gear by the driven gear which is geared with the drive gear, thereby controlling the rotational movement of the wheels for stable driving. Achieve a state.

If the driver changes the shift lever from D range to 2 range and then shifts the shift lever to D range without driving the accelerator pedal while driving at 4 speeds in a vehicle equipped with the automatic transmission operating as described above, During the power-off 4 → 2 skip-down shift stored in the memory, the actual shift stage is sequential power-off 2 → 3,3 → 4 up even though the target shift stage is shifted from the power-off 2 → 4 skip-up shift. Shift shift control was performed.

However, the above-described conventional technique is practical because there is no method for shifting the shift stage to the power-off 2 → 4 skip-up even though the target shift stage due to the immediate change of the shift lever is changed to the power-off 2 → 4 skip shift. Therefore, the shift stage performs sequential upshift shifting in the order of power off 2 → 3, 3 → 4, so that the actual shift time of the shift stage according to the driving state of the vehicle takes a long time and does not fully reflect the driver's willingness to shift. As a result, a shift shock occurs during shifting, and there is a problem of inhibiting riding comfort and shifting feeling.

The present invention has been made to solve the above problems, and an object of the present invention is to change the shift lever by a driver so that the shift stage is powered off 4 → 2. When the shift control signal for skip-shift shifting is output, the release duty is reduced to D (%), which is the value set when the shift lever is changed, to release the end clutch pressure (E / C) at a high power-off duty. After a certain time (t) is maintained, the pressure of the end clutch (E / C) is quickly maintained at a constant level, and then the end clutch (E / C) control duty value is corrected by the set value d (%) and then output. Power off 2 → 4 skip-up shift shifting control to quickly perform power-off 2 → 4 skip-up shift shifting according to the driver's shifting intention, and to prevent shift shock during shifting. Power-off of the automatic transmission has the effect of comfort and damaged byeonsokgam 4 → 2 → 4 to provide a shift control method.

1 is a power-off manual 4 → 2 → 4 shift control duty pattern diagram of an automatic transmission according to the present invention.

2 is a block diagram of a control device to which a power-off manual 4 → 2 → 4 shift control method of an automatic transmission according to the present invention is applied.

3 is a flowchart illustrating a method of operating a power-off manual 4 → 2 → 4 shift control method of an automatic transmission according to the present invention.

In the power-off 4 → 2 → 4 shift control method of the automatic transmission of the present invention for achieving the above object, the shift lever is set at the D range while the vehicle is running at 4 speeds without the driver pressing the accelerator pedal. When the driver shifts the shift lever to D range immediately while outputting the power-off 4 → 2 skip shift control duty stored in the memory by varying the range, the target shift stage is changed to the power-off 2 → 4 skip up shift. Determining whether a shift request signal for shifting is output; When the driver changes the shift lever from the D range to the 2 range, the driver shifts the shift lever from the D range to the D range again and outputs a shift request signal for shifting the target shift stage from the power-off 2 to 4 skip-up shift. Power off 4 → 2 Skip down shift D (%), which sets the end clutch (E / C) release control duty at the variable time of the shift lever to release the pressure of the end clutch (E / C). Reducing and outputting the duty; Determining whether an arbitrarily set reference time (t) has elapsed as the end clutch (E / C) release control duty is reduced to a set duty value of D (%) and outputted; When the reference time (t) arbitrarily set in the above has elapsed, it is corrected to the set duty value d (%) and output as an initial duty for power off 2 → 4 skip up shift return, and the power off 2 → 4 skip up above. And performing a subroutine for shift regeneration shift control.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the control apparatus to which the automatic transmission power-off 4 → 2 → 4 shift control method according to the present invention is applied is configured to detect a signal that is varied according to the driving state of the vehicle and output the corresponding electric signal. The shift lever is variable to release the end clutch (E / C) pressure with a high power off duty by reading and receiving the vehicle driving state detecting means 10 and the electric signal output from the vehicle driving state detecting means 10. At this point, the release duty is reduced to the set value D (%) to maintain a certain time t so that the pressure of the end clutch E / C is quickly maintained at a certain level and then the end clutch E / C. ) The control means 20 for correcting the control duty value by the set value d (%) and outputting the power off to perform the power-off 2 → 4 skip-up shift shift control, and the duty control signal output from the control means 20. Licensed Oh, it consists of a drive means 30 for performing the shift control.

The vehicle driving detecting means 10 detects the opening degree of a throttle valve whose opening / closing state is variable in conjunction with the operation state of the accelerator pedal, and outputs a corresponding signal to the throttle valve opening degree detecting unit 11 and the output shaft rotational speed of the vehicle. Detects the vehicle speed detection unit 12 and outputs a corresponding signal corresponding to the traveling speed of the vehicle, and if the shift stage is changed according to the throttle valve opening amount and the vehicle speed, the shift state of the shift stage is detected and the corresponding signal A gear stage sensing unit 13 for outputting a shaft, a turbine shaft rotation speed sensing unit 14 for detecting a rotation speed of a turbine shaft of a torque converter connected to an input shaft of a transmission, and outputting a corresponding signal, and an engine operating state; The engine speed detection unit 15 detects the rotational speed of the crankshaft variable according to the output and outputs a corresponding signal, and detects the position variable according to the driver's shift lever operation. Signal consists of including a shift lever sensor 16 for outputting to.

Referring to the power-off 4 → 2 → 4 shift control method of the automatic transmission according to the present invention using the control device formed by the above-described configuration, as shown in FIG. 3, first, the vehicle was traveling at 4 speeds. While the driver does not press the accelerator pedal, the shift lever is shifted from the D range to the 2 range, and the driver outputs the power-off 4 → 2 skip shift control duty stored in the memory as shown in FIG. When immediately changing to the D range, the control means 20 determines whether a shift request signal for shifting the target shift stage from the power-off 2 to 4 skip-up shift is output (S100 to S120).

In step S120, when the driver changes the shift lever from the D range to the second range, the shift lever is immediately changed to the D range, and a shift request signal for shifting the target shift stage from the power-off 2 to 4 skip-up shift is output. In this case, the control means 20 releases the end clutch E / C release control duty at the variable time point of the shift lever to release the pressure of the end clutch E / C which has been released by the high power-off 4 → 2 skip down shift shift duty. As shown in FIG. 1, the duty is reduced to a set duty value D (%) and output to PCSV-A, which is the driving means 30 (S130).

In addition, the control means 20 outputting the end clutch E / C release control duty by reducing the duty to the set duty value D (%) as shown in FIG. 1 has a predetermined reference time t. It is determined whether elapsed (S140).

When the predetermined reference time t has elapsed, the control means 20 corrects to the set duty value d (%) and outputs it to the PCSV-A, which is the driving means 30, to turn off the power 2 → 4. Subroutines for shift return shift control are performed (S150 and S160).

On the other hand, if the condition is not satisfied in step 100, the flow is performed again from the beginning, and if the condition is not satisfied in step 120, step 110 is performed again.

On the other hand, if the reference time t set in step 140 has not elapsed, step 130 is performed again.

After reducing the duty to the end clutch (E / C) release control duty as D (%), which is the duty value set as shown in FIG. 1, maintain the reference time t set arbitrarily, and then set the duty again. The reason is that the hydraulic circuit corresponding to the present invention is outputted by correcting the value d (%), so the hydraulic pressure drops rapidly when the hydraulic pressure of the end clutch E / C is released.

Therefore, when the control means 20 generates a power-off 2 to 4 skip-up shift shift return control signal in the hydraulic state sharply separated from the above, if the released hydraulic pressure drops below a predetermined level, the hydraulic circuit checks it. When the duty is output at the initial duty d (%) under the influence of the ball, the driving means 30 performs an end clutch E / E for executing the power-off 2 → 4 skip-up shift shifting output from the control means 20. There arises a problem that takes a long time to raise the hydraulic pressure of C) again.

Therefore, the above problem is solved by reducing the high release duty to a low duty D (%) in S140 and then maintaining it for a randomly set time (t) and quickly shifting the shift stage to the driver's willingness to shift. 2 to 4 skip up shift shift control is performed.

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

As described above, in the present invention, the release of the end clutch pressure (E / C) at a high power off duty is reduced to D (%), which is a value set at the time when the shift lever is changed, and thus, the predetermined time (t ), The pressure of the end clutch (E / C) is quickly maintained to a certain level, and the end clutch (E / C) control duty value is corrected by the set value d (%) and then output. By performing the 4 skip up shift shifting control, the power-off 2 → 4 skip up shift shifting can be executed quickly according to the driver's shifting intention to prevent shift shock generated during shifting, thereby improving ride comfort and shifting feeling.

Claims (1)

The driver was outputting the power-off 4 → 2 skip shift control duty stored in the memory by changing the shift lever from the D range to the 2 range while the vehicle was running at 4 speeds without the driver pressing the accelerator pedal. Determining whether a shift request signal for shifting the target shift stage from the power-off 2 to 4 skip-up shift is output when the shift lever is immediately changed to the D range; When the driver changes the shift lever from the D range to the 2 range, the driver shifts the shift lever from the D range to the D range again and outputs a shift request signal for shifting the target shift stage from the power-off 2 to 4 skip up shift. Power off 4 → 2 Skip down shift D (%), which sets the end clutch (E / C) release control duty at the variable time of the shift lever to release the pressure of the end clutch (E / C). Reducing and outputting the duty; Determining whether an arbitrarily set reference time (t) has elapsed as the end clutch (E / C) release control duty is reduced to a set duty value of D (%) and outputted; When the reference time t arbitrarily set above has elapsed, it is corrected to the set duty value d (%) and output as an initial duty for power-off 2 → 4 skip-up shift return and the power-off 2 → 4 skip-up above. A power-off 4 → 2 → 4 shift control method for an automatic transmission comprising a step of performing a subroutine for shift return shift control.

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