KR19980049793A - Power-up shift shift control method of automatic transmission - Google Patents

Abstract

The present invention relates to a power-off shift shift control method of an automatic transmission. When the power-off shift signal is output, the state of the kick-down servo switch of the kick-down band is determined. When the duty control signal is output and reaches the feedback point in the illustrated duty pattern, the feedback control signal is gradually controlled by performing feedback control from the point of time of the feedback detection. When the completion point is reached, all duty control is terminated after the set time is reached. When the power-off 1 to 2 speed upshift is shifted, the clutch shock by controlling the kick-down brake is reduced to reduce the shift shock and shift. It has the effect of improving the durability of the kick-down brake by improving the shifting time.

Description

How to control power-up shift shifting of automatic transmission

The present invention relates to a power-off upshift shift control method of an automatic transmission, and more particularly, a sudden operation of a kick-down brake and a reaction force element when a gear shift stage of a downhill driving vehicle shifts a power-down one-speed upshift. The present invention relates to a power off-up shift shift control method of an automatic transmission for reducing shift shock caused by a furnace.

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 driving fatigue can be reduced, and the engine stall is not generated due to the malfunction of the cab or the immature driving, so that even the beginner can easily operate the driving.

Therefore, the automatic transmission receives a fluid pressure from the oil pump by converting 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 changed. Controls the operating state of the hydraulically actuated friction element for selecting the shift stage.

The action of the planetary gear arrangement is switched in accordance with the selective movement of the friction element, which consists 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 which is geared to the longitudinal reduction gear by the driven gear which is geared to the drive gear to control the rotational operation 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.

Accordingly, when the vehicle equipped with the automatic transmission operating as described above goes downhill, the shift speed signal SS is output at the time of power-off 1 and the shift speed is completed, and the shift synchronization is completed. After that, driving continued.

However, the above-described conventional technique outputs the duty of the solenoid valve to 0 (%) as the shift command (SS) of the shift stage is output and determines the shift synchronization (SF). Applying the hydraulic pressure without control (Apply) has a problem of acting as a sudden engine (engage) and reaction force element of the kick-down brake to reduce the fastening shock of the clutch and durability of the one-way clutch (OWC: Own Way Clutch).

Therefore, in order to solve the above-mentioned conventional problem, 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 pattern shown in FIG. When the duty control signal is output and reaches the feedback point, the feedback control is performed starting from the point of time of the feedback detection to gradually control the kick-down brake, and the predetermined time is set when the duty control signal reaches the completion point of the feedback. After all the duty control is completed, the clutch shock by the control of the kick-down brake is reduced by shifting the power-down 1 to 2 speed up shift, reducing the shift shock and improving the shifting feeling during shifting. Provides a power-off shift shift control method of an automatic transmission with an effect of improving durability It is to.

The present invention for achieving the above object,

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, etc. in the second speed up shift at the power-off 1 speed 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;

Determining whether the output duty control signal reaches a feedback point (F.B) when the kickdown servo switch is turned off;

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 section c, d. Outputting a duty control signal after performing the back control routine;

Performing a feedback control (F.B) control routine by the duty control signal output from the target change rate Ni as calculated;

Determining whether the feedback control is completed (F.F) as the feedback control routine is performed;

When the feedback control is completed in the above, it characterized in that it comprises a step of 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 for controlling power up shift shifting 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 shift shift control apparatus of the automatic transmission according to the embodiment of the present invention is

A vehicle driving state sensing means 10 which receives a signal that is varied in the state of the vehicle and outputs a corresponding electric signal according to a driving state of the vehicle;

In response to the signal output from the vehicle driving state detecting means 10 being read and a power-off shift signal being output, the state of the kickdown servo switch of the kickdown band is determined. Accordingly, when the duty control signal reaches the feedback point, the feedback control signal is output, and the feedback control operation is performed starting from the point of time of the feedback detection, thereby gradually controlling the kickdown brake, and the duty control signal is Shift control means (20) for outputting a duty signal for a predetermined period of time upon completion of the feedback completion time 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.

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

A throttle valve opening detection unit 11 for detecting an opening degree of a throttle valve whose opening / 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 speed detection unit 14 for detecting a rotation speed of the crankshaft which is variable in an operating state of the engine and outputting a corresponding signal;

Turbine shaft rotation speed sensing 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, the shift control means 20 when the vehicle goes downhill Determines whether a second speed upshift shift control signal is output at the first power-off speed (S100).

When the second speed up shift shift control signal is output at the first power-off speed, the shift control means 20 performs the set fill time Ft of the section a as shown in FIG. It is determined whether the fill time 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, and the like at a second speed up shift at the first power-off of the memory. The duty control signal is output to the driving means 30 (S120).

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

Accordingly, the fill time Ft set above is completed, and as 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 control 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 kick-down servo switch is turned off in the above, the shift control means 20 determines whether the duty control signal output from the above reaches 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). The duty control signal is output to the driving means 30 after the feed back control routine of the subject period c and d is performed (S150).

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

D _N = (Di) _N -K _P × e _N -K _P × (e _N -e _N-1 )

(Wherein (Di) _N = (Di) _N-1 -K _D x e _N ,

e _N is Ni (change rate of the target turbine)-(Nt) _N (change rate of the real turbine),

e _N-1 is Ni-(Nt) _N-1 )

However, when the duty control signal outputted above does not reach the feedback (F.B) time point, the shift control means 20 re-determines whether the duty control signal reaches the feedback time 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 of determining the 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 feedback 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 feedback (FB) is smaller than the absolute value (| Nt |) of the rate of change of the real turbine, shift control ㅓ means 20 judges that the duty control signal outputted above has reached the piggyback time point, and the time point is the time SB at which the first speed shift stage starts to be synchronized to actual speed 2 at the target speed change speed. It is determined (S142).

Therefore, the shift control means 20 determines the difference between the input value and the output value at the time of determining the feed back FB by the duty control signal outputted above (turbine speed (Nt)-2 speed gear ratio x output shaft speed (No)). It is determined whether-is less than 100rpm (S143).

The difference between the input value and the output value (the turbine speed (Nt)-2 speed gear ratio × output shaft speed (No) is less than-100 rpm) at the time of judging the feed back (FB) point by 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 a set arithmetic formula (S144).

Ni = ac × N0 + bc

(Where Ni is the change rate of the target turbine, ac and bc are constants for calculating the change rate 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 × No-bc

(Where Ni is the change rate of the target turbine, ac and bc are constants for calculating the change rate 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 in the above, the shift control means 20 performs a feedback (F.B) control routine by the duty control signal output from the above (S150).

Accordingly, as the feed back control routine is performed, the shift control means 20 calculates and determines the completion (F.F) state of the feed back section by a set arithmetic expression (S160).

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

String Nt-2 Speed Gear Ratio × String No ｜ 100 rpm

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

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

Therefore, the duty control signal is output from the above, and the application pressure flows into the kickdown brake, and the inflow of the 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 control is performed in the duty pattern shown in FIG. When the signal is output and reaches the feedback point, the feedback control is performed from the point of time of the feedback detection, 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. After completion of all duty control, the clutch shock by the control of the kick-down brake is reduced by shifting the power-up 1 to 2 speed up shift, reducing the shift shock and improving the feeling of shift during shifting. We can provide the power-off shift shift control method of the automatic transmission with the effect to improve durability. have.

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 section a is completed, the initial duty value, the duty slope and the duty output time are set in the second up-shift at the power-off 1 of the memory to output the corresponding duty control signal. Steps; Determining whether the kick-down servo switch of the kick-down 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 duty control signal outputted above reaches the feedback point FB, 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 section c, d. Outputting a duty control signal after performing the back control routine; Performing a feedback control (F.B) control routine by the duty control signal output from the target change rate Ni as 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 at 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 duty value Dn of the duty control signal output from the above is output by the value calculated and calculated by the following arithmetic expression. D _n = (Di) _n -K _P × e _n -K _D × (e _n -e _n-1 ) Where (Di) _n = (Di) _n-1 -K _D x e _n , e _n is Ni (change rate of the target turbine)-(Nt) _n (change rate of the real turbine), and e _n-1 is Ni -(Nt) _n-1 .) 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 if the output duty control signal does not reach the feedback point (F.B); 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) is smaller than the absolute value (| Nt |) of the rate of change of the real turbine, Judging that the duty control signal outputted from the PGP has reached the piggyback time point, and determining the time point as the time SB at which the first speed shift stage starts to be synchronized to the second speed, which is the target speed change stage; 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) when judging the feedback point (FB) from the output duty signal output above. Steps; The difference between the input value and the output value (turbine speed (Nt)-2 speed gear ratio × output shaft speed (No) is less than -100 rpm) at the time of judging the feedback point (FB) from the output duty signal output as described above. Steps; The difference between the input value and the output value (turbine speed (Nt)-two-speed gear ratio × output shaft speed (No) of less than -100 rpm) when the feedback (FB) viewpoint is judged by the duty control signal output 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. A power up shift shift control method of an automatic transmission comprising a step of calculating and calculating by a set arithmetic formula. {The method of determining a feedback time point above | Nt | Cfb × | Ni ｜ (Where | Nt | is the absolute value of the actual turbine differentiation rate, Cfb is the correction constant for the feed back (F.B), and | Ni | is the absolute value of the target turbine change rate.) The change rate (Ni) calculation method of the target turbine in the above, Ni = ac × No + bc (Where Ni is the change rate of the target turbine, ac and bc are constants for calculating the change rate 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.)} The target difference value according to claim 3, wherein the difference between the input value and the output value (turbine speed (Nt)-two-speed gear ratio x output shaft speed (No) is greater than -100 rpm) 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. {Ni = -ac × No-bc (Where Ni is the change rate of the target turbine, ac and bc are constants for calculating the change rate 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.)} The method of claim 1, wherein the synchronization completion determination method is performed by subtracting the rpm value of the input turbine by a value calculated by multiplying the gear ratio of the transmission stage by the output shaft rpm value and subtracting the calculated absolute value by the value calculated by multiplying the set reference rpm value. A method for controlling power-up shift shifting of an automatic transmission comprising: making a synchronous completion determination when the calculated absolute value is less than or equal to 100 rpm including the set reference rpm. {｜ Current Nt-2 Speed Gear Ratio × String No ｜ 100 rpm (Nt is the rpm value of the input turbine, No is the value of the output shaft rpm, and 100 rpm is the set reference rpm.)} The method of claim 1, wherein the duty control signal is output to the application pressure flows into the kick-down brake, the inflow of the applied application pressure to the kick-down brake switch off and at the same time gradually control the adjust rod (Adjust Rod) kick A method of controlling power upshift shifting of an automatic transmission, the method comprising: engaging a clutch for gradually stopping the operation of the kickdown drum by downband friction and shifting the shift stage to the second shift stage, which is a target shift stage.