KR100267326B1 - Automatic transmission control method - Google Patents

Abstract

PURPOSE: A method for controlling power up shift is provided to improve shift quality through reducing a coupling shock of a clutch, and to improve endurance of a kick-down brake. CONSTITUTION: A shift control instrument decides a power off shift control signal from the first-range to the second range to perform a fill time. The shift control instrument outputs a duty control signal to a driving instrument. In case of off state of a kick-down servo switch in a kick-down brake, the shift control instrument decides the duty control signal reaching a feedback point. A duty inclination is decided as an inclination_Db_pause for outputting the duty control signal to the driving instrument. The shift control instrument performs a feedback control routine by the duty control signal for deciding completed state of a feedback section.

Description

How to control power-up shift shifting of automatic transmission

The present invention relates to a method for controlling the power-off shift shift of an automatic transmission. More specifically, the downshift driving vehicle has a sudden operation and a reaction force element of the kick-down brake when the shift stage of the downhill driving vehicle shifts up to 1-speed upshift. The present invention relates to a power off-up shift control method of an automatic transmission for reducing shift shock caused by the operation 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. 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. Fatigue can be reduced, and an engine stall is not generated due to a malfunction of the driver or an immature driving during driving, so that even a beginner can easily operate a driving operation.

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 of the gear stages of the transmission gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element for selecting stages.

The selective action of the friction element, which consists of a clutch or brake, shifts the operation of the planetary gear arrangement to achieve a suitable gear ratio and is then transmitted to the drive gear.

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 the friction elements consisting of a clutch or a brake. Let's do it.

Therefore, when the vehicle equipped with the automatic transmission operating as described above goes downhill, the two-speed upshift shift signal SS is output at the first power-off speed and the shift synchronization completion (S, F) is judged at the same time. After running, the driving was continued.

However, the above-described conventional technology outputs the duty of the solenoid valve as 0 (%) as the shift shift signal (SS) of the shift stage is determined and the shift synchronization completion (S, F) is determined, thereby kicking down the piston of the kickdown band. By applying the hydraulic pressure on the side without control, it acts as a sudden engagement and reaction force of the kick-down brake, thereby degrading the fastening shock of the clutch and durability of the one-way clutch (OWC). .

Accordingly, an object of the present invention is to determine the state of the kick-down servo switch of the kick-down band when the power-off shift signal is output, when the kick-down servo switch is off, the duty control signal is output in the duty pattern to reach the feedback point When the feedback point is detected, the feedback control is performed slowly to control the kick-down brake, and when the duty control signal reaches the completion point of the feedback, the predetermined time period is completed and all duty control ends, thereby powering off. It is intended to improve the durability of the kick-down brake by reducing the shift shock by reducing the engagement shock of the clutch by controlling the kick-down brake during the shift of the first to second speed upshift.

The present invention for achieving the above object comprises the steps of determining whether or not the output of the two-speed upshift shift control signal at the first power-off when the vehicle is going downhill; Performing the set fill time (Ft) of the section a when the second speed upshift control signal is output at the first power-off speed and determining whether the performed fill time (Ft) is completed; Outputting a corresponding duty control signal by setting an initial duty value, a duty gradient, and a duty output time at a second upshift 에서 at a power-off 1 speed of the memory when the set fill time (Ft) of the section a is completed; Determining whether the kickdown servo switch of the kickdown brake is turned off according to the completion of the set fill time (Ft) and outputting a duty control signal; Determining whether the output duty control signal reaches a feedback point (F.B) when the kickdown servo switch is turned off; When the output duty control signal reaches the FB time point, the end duty value of the interval b is set as an initial value and the duty slope is given by the slope_Db_force (% / ms) to feed back the interval c and d. Outputting a duty control signal after performing a control routine section; Performing a feedback control routine based on the output duty control signal as the target change rate Ni is calculated; Determining whether a feedback control is completed as a result of performing the feedback control routine; When the feedback control is completed, performing a section e control routine to output the duty control signal by the set time of the section e.

1 is a power up shift shift control duty pattern diagram of an automatic transmission according to an embodiment of the present invention.

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

3 is a flowchart illustrating a method of controlling a power up shift shift 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. 2, the configuration of the power-off upshift shift control apparatus of the automatic transmission according to the embodiment of the present invention is applied by receiving a signal that is output by varying the state of the vehicle according to the driving state of the vehicle. Vehicle driving state sensing means for outputting a signal; When the kick-down servo switch is turned off when the kick-down servo switch is turned off by determining the state of the kick-down servo switch of the kick-down band when the power-off shift signal is output by receiving and reading the signal output from the vehicle driving state detecting means 10. When the duty control signal reaches the feedback point by outputting a duty control signal according to a pattern, the feedback control is performed starting from the feedback point detection time to gradually control the kickdown brake, and the duty control signal is Shift control means 20 for outputting a duty signal for a predetermined time when the feedback completion point is reached to complete shift synchronization; It consists of a driving means 30 for performing the control operation of the kick-down brake by receiving the duty control signal output from the shift control means 20.

The vehicle driving state detecting means 10 includes: a throttle valve opening degree detecting 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 an 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 for detecting a variable state of the shift stage and outputting 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; Turbine shaft rotation speed detection unit 15 for detecting the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputs a corresponding signal.

When the vehicle goes downhill, the shift control means 20 determines whether a two-speed upshift shift control signal is output at the first power-off speed (S100).

When the two-speed upshift shift control signal is output at the first power-off speed, the shift control means 20 performs the set fill time Ft of the period a as shown in FIG. It is determined whether (Ft) is completed (S110).

When the set fill time Ft of the section a is completed, the shift control means 20 sets an initial duty value, a duty gradient, a duty output time, etc. at a second speed up shift 에서 at a power-off 1 speed of the memory, and then performs a corresponding duty. The control signal is output to the driving means 30 (S120).

However, if the set fill time Ft is not completed, the shift control means 20 returns to the initial stage to complete the fill time.

Meanwhile, as the completion of the set fill time Ft is completed and the duty control signal is output, the shift control means 20 determines whether the kickdown servo switch of the kickdown brake is turned off (S130).

That is, when the shift shift signal S.S is output and the duty control signal is output, the apply pressure turns off the kickdown servo switch of the kickdown brake.

Therefore, when the kickdown servo switch is turned off, the shift control means 20 determines whether the output duty control signal has reached the feedback point F.B (S140).

When the duty control signal outputted above reaches the feedback point FB, the shift control means 20 sets the end duty value of the section b as an initial value and the duty gradient is set to slope_Db_force (% / ms). After performing the feedback control routine interval of the subject periods c and d, the duty control signal is output to the driving means 30 (S150).

The duty value of the duty control signal output from the above is output to the driving means 30 by the value calculated and calculated by the following arithmetic expression.

Dn = (Di) _n -K _p × e _n -K _d × (e _n - _n-1 )

(Where (Di) _n = (Di) _n-1 -K _D × e _n , Kp is proportional gain factor in PID control, K _d is differential gain factor in PID control, e _n is Ni (target turbine Rate of change)-(Nt) _n (change rate of the real turbine), and o _n-1 is Ni- (Nt) _n-1 .)

On the other hand, when the output duty control signal does not reach the feedback point FB, the shift control means 20 re-determines whether the duty control signal reaches the feedback point by the set arithmetic expression (S141). .

In other words, it is determined whether the value calculated by multiplying the absolute value | Ni | of the change rate of the target turbine by the correction constant Cfb for the feed back F.B is smaller than the absolute value | Nt | of the change rate of the real turbine.

The method for determining a feedback time point is as follows.

| Nt |> Cfb × | Ni ｜

(Where | Nt | is the absolute value of the actual turbine change rate, Cfb is the correction constant for the feed back (F.B), and | Ni | is the absolute value of the target turbine change rate.)

When the value calculated by multiplying the absolute value (| Ni |) of the rate of change of the target turbine by the correction constant (Cfb) for the feed back (FB) above is smaller than the absolute value (| Nt |) of the rate of change of the real turbine, shifting The control means 20 determines that the duty control signal outputted above has reached the feed back time point, and sets the time point to the time point FB at which the first speed shift stage starts to be actually shifted to the second speed which is the target speed change stage. It is determined (S142).

Therefore, the shift control means 20 determines that the difference between the input value and the output value (the number of revolutions of the turbine (Nt)-the second speed ratio x the output shaft speed (No) of the turbine) is determined by the duty control signal output above. -Determine whether it is less than 100rpm (S143).

Difference between the input value and the output value (turbine speed (Nt)-2 speed gear ratio x output shaft speed (No) is less than-100 rpm) when judging the feed back (FB) point of time based on the duty control signal output above. The change rate Ni of the turbine is a constant (ac, bc) for calculating the change rate of the target turbine and the output shaft rotation speed No determined at the time SB at which the shift stage starts the actual shift synchronization to the target shift stage. It is calculated by calculating by the set arithmetic formula (S144).

Ni = ac × No + bc

(Where Ni is the rate of change of the target turbine, ac and bc are constants for calculating the rate of change of the target turbine, and No is the output shaft rotation speed determined at the time SB at which the shift stage starts the actual shift synchronization to the target shift stage. to be. )

However, the difference between the input value and the output value (turbine speed (Nt)-2 speed gear ratio × output shaft speed (No) of greater than -100rpm) is determined by the duty control signal outputted above. The change rate Ni is a constant (ac, bc) for calculating the change rate of the target turbine and the output shaft rotation speed No determined at the time SB at which the shift stage starts the actual shift synchronization to the target shift stage. It calculates by calculating by arithmetic formula (S145).

Ni = -ac x No-bc

(Where Ni is the rate of change of the target turbine, ac and bc are constants for calculating the rate of change of the target turbine, and No is the output shaft rotation speed determined at the time SB at which the shift stage starts the actual shift synchronization to the target shift stage. to be.)

As the target change rate Ni is calculated, the shift control means 20 performs a feedback control routine F.B based on the duty control signal outputted above (S150).

Therefore, as the feed back control routine is performed in the above, the shift control means 20 calculates and determines the completion (F.F) state of the feed back section by a set arithmetic expression (S170).

The method of determining the completion state of the feedback period is as follows.

｜ Nt-2 Speed Gear Ratio × Hot No ｜ ≤100rpm

(Nt is the rpm value of the input turbine, No is the value of the output shaft rpm, 100rpm is the set reference rpm value.)

When the feedback control is completed in the above, the shift control means 20 completes the interval e control duty to output the duty control signal by the set time of the interval e and ends all duty control (S170).

Therefore, the duty control signal is outputted from the above, and the application pressure flows into the kickdown brake, and the applied application pressure turns off the kickdown brake switch and at the same time, gradually adjusts the adjust rod to the kickdown band. A clutch that stops the operation of the kick-down drum gradually by friction and shifts the shift stage to the second shift stage, which is the target shift stage, is engaged.

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, when the power-off shift signal is output, the state of the kick-down servo switch of the kick-down band is determined, and when the switch is off, the duty in the duty pattern shown in FIG. When the control signal is output and reaches the feedback point, the feedback control is performed from the point of time when the feedback is detected, and the kick-down brake is gradually controlled to set the predetermined time when the duty control signal reaches the completion point of the feedback. By completing all the duty control, the clutch shock by the control of the kick-down brake is reduced when the power-off 1-speed up-shift is shifted to reduce the shift shock, and to improve the shifting feeling during shifting, the kick-down brake To provide a power-off shift shift control method of an automatic transmission with an effect of improving the durability of the vehicle. Can be.

Claims (6)

Determining whether a two-speed upshift shift control signal is output at a power-off one speed when the vehicle is going downhill; Performing the set fill time (Ft) of the section a and determining whether the performed fill time (Ft) is completed when the two-speed upshift shift control signal is output at the power-off one speed; When the set fill time (Ft) of the interval a is completed, setting the initial duty value, the duty slope and the duty output time at the second up-shift 에서 in the power-off 1 of the memory to output the corresponding duty control signal Wow; Determining whether the kickdown servo switch of the kickdown brake is turned off according to the completion of the set fill time (Ft) and outputting a duty control signal; When the kickdown servo switch is turned off, determining whether the output duty control signal reaches a feedback point (F.B); When the duty control signal outputted above reaches the feed back (FB) time point, the end duty value of the section b is set as an initial value and the duty slope is given by the slope_Db_force (% / ms) to feed the sections c and d. Outputting a duty control signal after performing the back control routine; Performing a feedback control routine (F.B) by the duty control signal outputted from the controller as the target change rate Ni is calculated; Determining whether the feedback control is completed (F.F) as the feedback control routine is performed; And performing a section e control routine to output a duty control signal according to a set time of section e, when the feedback control is completed, wherein the power up shift shift control method of the automatic transmission is performed. The method of claim 1, wherein when the set fill time Ft is not completed, returning to the initial stage to complete the fill time Ft. The method of claim 1, further comprising: re-determining whether the duty control signal reaches the feedback point by a set arithmetic expression when the output duty control signal does not reach the feedback point (F.B); If the value calculated by multiplying the absolute value of the rate of change of the target turbine | Ni | by the correction constant Cfb for the feedback FB is smaller than the absolute value of the rate of change of the real turbine, | Nt | Judging that the duty control signal has reached the feedback point, and determining the viewpoint as the point of time (SB) at which the first speed gear is actually started to be shifted to the second speed, which is the target speed gear; Judging whether the difference between the input value and the output value (turbine speed (Nt)-2 speed gear ratio x output shaft speed (No) is less than-100 rpm) at the time of judging the feedback point (FB) by the output duty control signal; A difference between an input value and an output value (turbine speed (Nt)-2 speed gear ratio x output shaft speed (No) of less than-100 rpm) at the time of judging a feedback point (FB) from the output duty control signal; The change rate Ni of the target turbine is a constant (ac, bc) for calculating the change rate of the target turbine and the output shaft rotation speed (No) determined at the time SB at which the actual shift synchronization to the target shift stage starts. ) Is calculated and calculated by a set arithmetic formula. 4. The target value according to claim 3, wherein the difference between the input value and the output value (turbine speed (Nt)-2 speed gear ratio x output shaft speed (No) of the turbine) is determined when the feedback point is judged by the output duty control signal. The change rate Ni of the turbine is a constant (ac, bc) for calculating the change rate of the target turbine and the output shaft rotation speed No determined at the time SB at which the shift stage starts the actual shift synchronization to the target shift stage. Comprising the step of calculating and calculating by a set arithmetic formula Power up shift shift control method of the automatic transmission made. The method of claim 1, wherein the synchronization completion determination method subtracts the rpm value of the input turbine by a value calculated by multiplying the gear ratio of the shift stage by the output shaft rpm value, and the synchronization is completed when the absolute value calculated is less than or equal to 100 rpm in the set reference rpm. A power-up shift shift control method of an automatic transmission comprising a judgment. The method of claim 1, wherein the duty control signal is output to the application pressure flows into the kick-down brake, the application pressure introduced from the above to turn off the kick-down brake switch and at the same time gradually control the adjust rod to the kick-down band friction And engaging the clutch for gradually stopping the operation of the kick-down drum to shift the shift stage to the 2-speed shift stage, which is the target shift stage.