KR100302799B1 - System and method for controlling speed change of automatic transmission - Google Patents

Abstract

PURPOSE: A system and a method for controlling speed change of an automatic transmission are provided to obtain the uniform shift feeling regardless of hydraulic deviation by removing the instability of the initial release pressure, setting up a turbine RPM at a feedback section as a differential value and performing precise control. CONSTITUTION: A system for controlling speed change of an automatic transmission comprises a traveling state sensing unit(10) consisting of a throttle opening degree sensor(11), a vehicle speed sensor, a turbine RPM sensor(13) and an engine RPM sensor(14), a control unit(20), and a drive unit(30). The control unit sets up a duty value corresponding to power-on 4-3 downshifting as Da% and outputs the duty value to the drive unit for a duty output time. After the duty output time, the control unit outputs a duty control signal to the drive unit by operating a duty control signal of a section b depending on an output shaft RPM. The duty value is Di and the gradient is Ramp-Di in the section b. The control unit decides the detection of a transmission starting point. If the transmission starting point is detected, the control unit stops duty control and outputs a duty control signal of a section b. Thereafter, the control unit finishes duty control of the section c and performs power-on downshift feedback control. If turbine RPM reaches a target transmission synchronization complete point, entire duty control is stopped.

Description

Transmission control device and method of automatic transmission

The present invention relates to a shift control apparatus and a method of an automatic transmission, and more particularly, to a drop in control pressure during shift shift control during power-on 4 → 3 downshift shifting in a vehicle driving the shift stage at four speeds. The present invention relates to a shift control apparatus and a method of an automatic transmission for preventing shift shock caused by hydraulic instability.

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 to ensure stable driving. Achieve a state.

When the power-on 4 → 3 downshift shift occurs while driving in the automatic transmission operating as described above, as shown in FIG. 1, conventionally, as the initial duty, the release pressure is dropped by the slope 1 in the section a and the turbine is released. When ΔNs is sensed, the duty of section a is terminated, and the duty control of section b is controlled until the setting section K is reached with the inclination 2, and when the setting section K is reached, the duty control of section b is reached. To stop the hydraulic pressure again by controlling the duty control of the C section with the slope 3, and when the SF point, the shift completion point of the target shift stage, is reached, the duty of the C section is terminated and the duty control of the d section is tilted 4 After controlling the pressure to drop the release pressure for a certain time, the duty control was finished.

However, the prior art has a problem that the initial release pressure is unstable and the initial shift feeling is not good, and it is sensitive to the hydraulic deviation, so that a constant shift feeling is not always obtained.

Therefore, an object of the present invention is to solve the above problems, as shown in the accompanying Figure 2, when a power-on downshift shift occurs, it maintains a section a while maintaining Ta for a predetermined time at the set duty value Da After performing the calculation, the duty value of section b is calculated using Ramp-Di as the slope, and when the SB point is detected, the duty of section b is terminated, and ΔDb% is calculated on the last duty value of section b. After outputting the duty of section C with the calculated duty value, the slope of Ramp-Dfb and the holding time of Tsb, when the holding time Tsb elapses, the duty output of section C is terminated, and the feedback control of section d is returned to the memory. After selecting and outputting by the stored value, when the turbine speed Nt reaches the shift completion time SF of the target shift stage, all duty control ends when Tff, which is the set time from that point, ends. Instability of Initial Release Pressure It is possible to precisely control the turbine RPM of the feed-back section, which is a real shift section, to solve the problem, and to adapt precisely to the hydraulic deviation, so that the transmission control device of the automatic transmission can always obtain a constant and good shift feeling. And a method thereof.

The present invention for achieving the above object,

Vehicle driving state detection means for receiving an output signal in which the state of the vehicle is varied according to the driving state of the vehicle and outputting a corresponding electric signal;

When the power on down shift shift occurs by receiving and reading the signal output from the vehicle driving state sensing means, the power on down shift duty control signal of the shift stage stored in the memory is output and the duty value is set to Da%. After maintaining the Ta, the duty cycle of section a is finished, and the duty control signal is output by the duty value of Di and the slope of Ramp-Di. After performing section b, if SB point is detected, △ Nb is applied to the last duty value of section b. The duty value of the calculated value, the slope of Ramp-Dfb, and the holding time of Tsb are divided into four equal parts of the output shaft rotation speed (No), and are output as the result of the interpolation method. When the feed back control of the d section is selected and output by the value stored in the memory, and the turbine speed Nt reaches the shift completion time SF of the target speed change stage, T control means for ending all duty control when ff elapses;

And a driving means for shifting the shift stage to a corresponding target shift stage by a duty control signal output from the control means without shift shock.

Another object to achieve the above object is

If the power-on-down shift shifting signal (SS) is generated by the driver's accelerator pedal operation while the vehicle is driving, the duty value corresponding to the power-on-down shift shifting control stored in the memory is set to Da% for the duty output time Ta. Outputting;

Terminating section a and outputting a corresponding duty control signal by calculating a duty control signal of section b according to the output shaft rotation speed (No rpm) when Ta, which is the duty output time set as described above, has elapsed;

Determining whether an S.B point, which is a time at which the shift stage is actually shifted to the target shift stage, is detected while outputting the duty control signal of the b section;

When the SB point, which is the point in time when the shift stage actually starts shifting to the target shift stage, is detected, the duty control of section b is terminated and the duty control signal of section C, which adjusts the hydraulic pressure of the initial shift, is Tsb. Outputting a while;

Terminating the duty control of the C section when the Tsb, the set duty output time of the C section, elapses, and performing feedback control of the power-on-down shift stored in the memory;

Determining whether or not the number of revolutions (Nt) of the turbine reaches the shift synchronization completion time (S.F) of the target speed change stage by performing the feedback control (F. B);

로 변경하여 피드 백제어를 계속 수행하고, 상기의 설정된 시간(Tff)이 경과하면 듀티제어신호를 0%로 출력하고 모든 듀티제어를 종료하는 단계를 포함하여 이루어지는 것을 특징으로 한다.When the rotation speed Nt of the turbine reaches the target shift synchronous completion time SF in the above, the target change rate Ni of the turbine is set for the set time Tff after the shift stage synchronization is stored in the memory.

And continuing to perform the feedback control, and outputting the duty control signal at 0% and ending all the duty control when the set time Tff has elapsed.

1 is a duty pattern diagram according to shift control of a conventional automatic transmission;

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

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

4 is an operation flowchart of a shift control method of an automatic transmission according to an 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. 3, a configuration of a shift control apparatus of an automatic transmission according to an embodiment of the present invention is provided.

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;

When the power on down shift shift occurs by receiving and reading the signal output from the vehicle driving state sensing means 10, the power on down shift duty control signal stored in the memory is output and the duty value is changed to Da%. After Ta is maintained, the duty cycle of section a is finished, and the duty control signal is output by the duty value of Di and the slope of Ramp-Di. After performing section b, the SB point is detected. The duty value of the value calculated by calculating ΔNb, the slope of Ramp-Dfb, and the holding time of Tsb are divided into four values of the output shaft rotational speed (No) and output as a result obtained by interpolation. After the section C is terminated and the feedback control of the section d is selected and output based on the value stored in the memory, when the turbine speed Nt reaches the shift completion time SF of the target shift stage, Set time When Tff is passed to the control means 20 to shut down all of the duty control;

By the duty control signal output from the control means 20 is composed of a drive means 30 for shifting the shift stage to the corresponding target shift stage without shift shock.

In the above, the vehicle driving 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 turbine shaft rotation speed sensing unit 13 for sensing a rotation speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal;

It consists of an engine speed detection unit 14 for detecting the rotational speed of the crankshaft variable according to the operating state of the engine and outputs a corresponding signal.

The above configuration will be described in more detail with reference to FIGS. 2 and 4 attached to the shift control method of the automatic transmission.

The power on down shift shift control method will be described in detail, for example, when a power on down shift shift occurs at a third speed while the vehicle runs at 4 speeds.

If the power-on 4 → 3 downshift shifting signal SS is generated by the driver's accelerator pedal operation while the vehicle is driving, the control means 20 controls the duty value corresponding to the power-on 4 → 3 downshift shifting control stored in the memory. Set to Da% to output to the drive means 30 during Ta, which is the duty output time (S100, S110).

When Ta, the duty output time set above, has elapsed, the control means 20 ends the section a, calculates the duty control signal in the section b according to the output shaft rotational speed (No rpm), and drives the corresponding duty control signal. Output to means 30 (S120, S130, S140).

The duty control signal of section b sets the duty value to Di and outputs the slope to the driving means 30 as Ramp-Di.

In addition, the duty value Di and the duty gradient Ramp-Di of the b section are divided into four equal parts of the output axis slope, and the respective values Di are calculated by the interpolation method.

It is determined whether the control means 20 detects the S.B point, which is the point in time at which the gear shift stage actually shifts to the target gear shift stage, while outputting the duty control signal of the b section.

When the SB point, which is the point in time at which the shift stage actually starts shifting to the target shift stage, is detected, the control means 20 ends the duty control of the b section, and adds + ΔDb% to the last duty value of the b section. The duty control signal of the C section for adjusting the oil pressure state of the speed change initial stage is outputted to the driving means 30 at the calculated duty value, the duty gradient Ramp-Dfb, and the duty output time Tsb (S150).

In the method for detecting the SB point, which is the time point at which the actual shift to the target shift stage starts, the turbine speed Nt detected from the time point at which the power-on-shift shift signal is output is set to the input turbine speed Nti. When it is larger than the value computed by calculating the rotation speed (DELTA) Ns value of the turbine which climbed to the point, the control means 20 determines that the SB point was detected.

Nt ≻ Nti + ▵ Ns

(Nt is the rotation speed of the turbine detected from the time when the power-on downshift shift signal is output,

Nti is the rotational speed of the input turbine,

△ Ns is the rotation speed value of the turbine

to be.)

In addition, the duty slope Ramp-Dfb and the set duty output time Tsb of the C section are calculated by the interpolation method by dividing the output shaft rotational speed (No rpm) into four and apply to the output of the duty control signal.

Therefore, when Tsb, which is the set duty output time of the C section, has elapsed, the control means 20 terminates the duty control of the C section, and performs the feedback control (FB) of the power on down shift stored in the memory. (S170, S180).

The initial duty value Dfb of the F.B control is set according to the rotation speed of the turbine in the map set in the memory.

In addition, the feedback control is calculated by the following arithmetic expression and output to the drive means 30 as a corresponding duty control signal.

Dn = (Di) n + Kp × en × Kd × (en-en-1)

Where Dn is a feedback duty control signal.

(Di) n = (Di) n-1 + Ki × en,

이고,en =

ego,

이고,en-1 =

ego,

(Di) o = Dbp + Dt,

In the above, Dt is a temperature correction value,

In the above Dbo is the initial engagement duty default according to the turbine speed (Nt rpm),

Ni is the target rate of change of turbine rotation speed

이고

ego

If K≤K1 in the above

If K <K1 in the above

to be.)

로 변경한다.In the above case, when K = K1, the control means 20 performs section e, and the target change rate of the turbine.

Change to

로 변경되면, 제어 수단(20)은 터빈의 회전수(Nt)가 목표 변속동기완료 시점(S.F)에 도달하였는가를 판단한다(S190).As described above, the target rate of change (Ni) of the turbine

If changed to, the control means 20 determines whether the rotational speed Nt of the turbine has reached the target speed change completion time SF (S190).

로 변경하여 피드 백제어를 계속 수행하고, 상기의 설정된 시간(Tff)이 경과하면 듀티제어신호를 0%로 출력하고 모든 듀티제어를 종료한다.When the rotational speed Nt of the turbine reaches the target speed change completion time, the control means 20 adjusts the target change rate Ni of the turbine for the set time Tff after the shift stage synchronization is stored in the memory.

After the set time Tff elapses, the duty control signal is outputted at 0% and all duty control ends.

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, if a power-on-down shift shift occurs, the duty cycle of the b section is set to Di and the ramp value is set to Ramp-Di after the period a is maintained by maintaining Ta for a predetermined time at the set duty value Da. If the SB point is detected and the SB point is detected, the duty cycle of the b section is terminated, and then the D value is calculated by calculating ΔDb% at the last duty value of the b section. After outputting the duty of, the duty output of the C section is terminated when the holding time Tsb elapses, and the feedback control of the d section is selected and outputted according to the value stored in the memory, and then the rotation speed Nt of the turbine is When the speed change completion time (SF) of the target shift stage is reached, all duty control ends when the set time Tff elapses from this point, thereby eliminating the instability of the initial release pressure, and the turbine of the feedback section, which is the actual shift section. Set RPM to Differential Therefore, it is possible to provide a transmission control device and a method of an automatic transmission having the effect of being able to precisely control the hydraulic deviation to obtain a constant and good shifting feeling at all times.

Claims (10)

In a vehicle equipped with an automatic transmission, The vehicle driving state detecting means detects the opening degree of the throttle valve whose opening / closing state is variable in conjunction with the operation state of the accelerator pedal, and outputs a corresponding signal by detecting the opening speed of the vehicle, and outputs the corresponding signal by detecting the driving speed of the vehicle. Turbine shaft speed detection unit for detecting the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and the transmission shaft and outputs a corresponding signal, and detects the rotational speed of the crankshaft variable according to the operating state of the engine Vehicle driving state detection means for outputting a corresponding electric signal by receiving a signal that is output by varying the state of the vehicle according to the driving state of the vehicle; When the power on down shift shift occurs by receiving and reading the signal output from the vehicle driving state sensing means, the power on down shift duty control signal of the shift stage stored in the memory is output and the duty value is set to Da%. After maintaining the Ta, the duty cycle of section a is finished, and the duty control signal is output by the duty value of Di and the slope of Ramp-Di. After performing section b, if SB point is detected, △ Nb is applied to the last duty value of section b. The duty value of the calculated value, the slope of Ramp-Dfb, and the holding time of Tsb are divided into four equal parts of the output shaft rotation speed (No), and are output as the result of the interpolation method. When the feed back control of the d section is selected and output by the value stored in the memory, and the turbine speed Nt reaches the shift completion time SF of the target speed change stage, T control means for ending all duty control when ff elapses; And a driving means for shifting the shift stage to a corresponding shift stage by a duty control signal output from the control means without shift shock. Determining whether a power-on-down shift shift signal is generated by a driver's accelerator pedal operation while driving the vehicle; Setting a duty value corresponding to the power-on-down shift control stored in the memory to Da% when the power-on downshift signal (S.S) is generated and outputting it during Ta, which is a duty output time; Terminating section a and outputting a corresponding duty control signal by calculating a duty control signal of section b according to the output shaft rotation speed (No rpm) when Ta, which is the duty output time set as described above, has elapsed; Determining whether an S.B point, which is a time at which the shift stage is actually shifted to the target shift stage, is detected while outputting the duty control signal of the b section; When the SB point, which is the point in time when the shift stage actually starts shifting to the target shift stage, is detected, the duty control of section b is terminated and the duty control signal of section C, which adjusts the hydraulic pressure of the initial shift, is Tsb. Outputting a while; Terminating the duty control of the C section when the Tsb, the set duty output time of the C section, elapses, and performing feedback control of the power-on-down shift stored in the memory; Determining whether the rotational speed Nt of the turbine reaches the shift synchronization completion point S.F of the target shift stage by performing the feedback control F.B; When the turbine speed Nt reaches the target shift synchronous completion time SF in the above, the target change rate Ni of the turbine is changed to Nib4 during the set time Tff after the shift stage synchronization is stored in the memory. And continuously performing the feed back control, and outputting a duty control signal at 0% when the set time Tff elapses, and ending all duty control. The method of claim 2, wherein the outputting of the duty control signal in the b section comprises setting the duty value to Di and outputting the ramp to Ramp-Di. The shift control method according to claim 3, wherein the duty value Di and the duty gradient Ramp-Di of the b section further comprise dividing the output shaft slope into four and outputting each of them by a value calculated by calculating the interpolation method. The method of detecting the SB point, which is the point in time at which the gear stage actually starts shifting to the target gear stage, is characterized in that the rotation speed Nt of the turbine detected from the time point at which the power-on downshift shift signal is output is input turbine. And determining that the SB point is detected when the rotation speed (ΔNs) of the turbine which has risen to the point set in the rotation speed Nti is larger than the value calculated. {Nt〉 Nti + △ Ns (Nt is the rotation speed of the turbine detected from the time when the power-on downshift shift signal is output, Nti is the rotational speed of the input turbine, ΔNs is the rotational speed value of the turbine which has risen to the set point. 3. The method of claim 2, wherein the duty control signal of section C is outputted by setting a duty value, a duty gradient Ramp-Dfb, and a duty output time calculated by calculating + ΔDb% at the last duty value of section b as Tsb. Shift control method of an automatic transmission comprising a step of outputting. The duty gradient Ramp-Dfb of the C section and the set duty output time Tsb are divided into four equal parts of the output shaft rotational speed (No rpm). Transmission control method of the transmission. The method according to claim 2, wherein the initial duty value Dfb of the F.B control is set according to the rotational speed Nt of the turbine in a map set in the memory; The feedback control method of the automatic transmission comprising the step of performing the operation according to the following arithmetic expression to output a corresponding duty control signal. {Dn = (Di) n + Kp x en x Kd x (en-en-1) Where Dn is a feedback duty control signal. (Di) n = (Di) n-1 + Ki × en, en = Ni-(Nt) n, en-1 = Ni- (Nt) n-1, (Di) o = Dbp + Dt, Where Dt is the temperature compensation value, In the above Dbo is the initial engagement duty default according to the turbine speed (Nt rpm), Ni is the target rate of change of turbine rotation speed

ego In the above, if K≤K1, Ni = Nib1, In the above, if K <K1, Ni = Nib2 to be.) } The shift control method for an automatic transmission according to claim 8, comprising performing section e when K = K1 and changing the target rate of change of the turbine to Ni = Nib2. The method of claim 8, further comprising determining whether the turbine rotation speed Nt reaches the target speed change completion time SF when the target change rate Ni of the turbine is changed to Nib 3 through continuous calculation. Shift control method of automatic transmission.

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