KR100308961B1 - System and method for controlling power-off fourth to second skip down shift of automatic transmission - Google Patents

Abstract

PURPOSE: A system and a method for controlling power-off fourth to second skip down shift of an automatic transmission are provided to remove a shifting shock by improving the shift responsiveness and to improve the traveling experience and the durability of a transmission. CONSTITUTION: A travel state sensing unit(10) senses the signals outputted from a throttle valve opening degree sensor(11), a vehicle speed sensor(12), a speed range sensor(13), a turbine rpm sensor(14), and an engine rpm sensor(15) and outputs corresponding electrical signals. A transmission control unit(20) outputs a duty, corrects the duty when a speed range is changed to a target speed range, outputs a duty control signal, outputs a duty for a predetermined time after speed change synchronization is completed, and finishes the duty control process. A drive unit(30) is an actuator releasing the hydraulic pressure of an end clutch by receiving the duty control signal from the control unit and controlling the hydraulic pressure of a rear clutch.

Description

Power-Off 4 → 2 Skip-Down Shift Control and Method of Automatic Transmission

The present invention relates to a shift control apparatus and a method of an automatic transmission, in particular, when a power-off 4 → 2 skip-down shift shift occurs while driving a vehicle equipped with an automatic transmission, the output duty is corrected to compensate for the shift duty and the shift is delayed. The present invention relates to a power-off 4 → 2 skip-down shift shift control apparatus and a method of an automatic transmission for preventing shock from occurring.

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 hydraulic pressure according to a shift schedule set according to the driving speed of the vehicle and the opening amount of the throttle valve. do.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure as described above 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 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 the control signal supplied 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.

In the automatic transmission vehicle operating as described above, when a power-off 4 to 2 skip-down shift shift occurs, the control means sets the duty control signal stored in the memory as shown in FIG. While the end clutch and the K / D break in the 4th speed are operating, the hydraulic pressure of the end clutch is released while the hydraulic pressure of the kickdown brake is maintained. Hydraulic pressure of the rear clutch (Rear Clutch) is formed to form a shift shift shifting speed shifting from the fourth to the second speed with the rear clutch and the kick down brake.

However, the conventional technique described above shows the initial fill time by the duty control of the PCSV B for releasing the hydraulic pressure of the end clutch and engaging the rear clutch when a power-off 4 → 2 skip down shift shift occurs as shown in FIG. The duty output time for both 'A' and 'B' sections is short in outputting the corresponding duty for a time, outputting the duty value for actually shifting the shift stage to the target shift stage, and outputting the slope as β1. The shift response that is synchronized to the target shift stage of the shift stage with respect to the shift control signal is slow, resulting in a shift shock during shifting, thereby reducing ride comfort and deteriorating durability of the automatic transmission.

An object of the present invention is to improve the response speed of the shift gear to the target shift stage by the shift control signal output from the control means to improve the shift response to eliminate the shock, thereby improving the ride comfort and durability of the automatic transmission The present invention provides a power-off 4 → 2 skip down shift shift control device and a method thereof.

In order to achieve the above object, the present invention provides a power-off 4 → 2 skip down shift shift control apparatus for a vehicle equipped with an automatic transmission, the throttle valve having an open / closed state variable in association with an accelerator pedal operating state of the vehicle. Throttle valve opening degree detection unit for detecting the degree of opening and outputting the corresponding signal, Vehicle speed detection unit for detecting the output speed of the output shaft to output the corresponding signal corresponding to the traveling speed of the vehicle, and according to the throttle valve opening amount and vehicle speed The shift stage detecting unit detects the shift stage variable state and outputs a corresponding signal when the shift stage is variable, and detects the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the automatic transmission to output the corresponding signal. Turbine shaft rotation speed detection unit, and detects the rotational speed of the crankshaft variable according to the operating state of the engine to detect the corresponding signal Engine power is done by the rotation number detecting portion includes a vehicle running state and outputting an electrical signal corresponding to the detection signal outputted from each of the sensing unit according to the running condition of the vehicle and means for sensing; When the power off 4 → 2 skip down shift shift control signal is output, the power off 4 → 2 skip down shift shift control duty signal stored in the memory is output. When the initial fill time elapses after outputting the corresponding duty during the initial fill time, the duty value is set to Db1, the duty is outputted when the shift stage is shifted to the target shift stage. A control means (TCU) for correcting Δd and outputting a duty control signal having a slope of β2, outputting the corresponding duty for a set time when the shift synchronization is completed, and ending all duty control; It is characterized in that it comprises a drive means for receiving the duty control signal output from the control means to release the hydraulic pressure of the four-speed end clutch, and to control and couple the hydraulic pressure of the rear clutch of the two-speed pressure.

In addition, the present invention for achieving the above object is, in the power-off 4 → 2 skip down shift shift control method of a vehicle equipped with an automatic transmission, in the four-speed vehicle in accordance with the driver's deceleration will be 2 Detecting an output state of a power-off 4 → 2 skip down shift shift control signal for shifting down into the shift speed; Setting and outputting a power off 4 → 2 skip down shift shift control signal stored in a memory when the power off 4 → 2 skip down shift shift control signal is outputted; According to the power-off 4 → 2 skip down shift shift control signal, the duty is outputted as 100% during the set initial fill time T2, and when the initial fill time T2 elapses, the duty is 0 for the set time tf. Performing a section A which is lowered to% and outputted; Outputting a duty control signal having a duty value of Db1 and a duty gradient of β1 when tf, the set initial fill time time, elapses; Detecting a time point at which the shift stage starts shifting to the target shift stage by outputting a duty control signal having a duty value of Db1 and a duty gradient of? 1; Completing the section B if the timing at which the shift stage starts shifting to the target shift stage is detected; Performing a C section for outputting a duty control signal having a duty value Δd and a slope β2 as the shift stage detects a time at which the shift stage starts shifting to the target shift stage and corrects the duty to Δd; Determining whether the shift stage is shifted to the target shift stage by outputting a duty control signal having a duty value? D and a slope? 2; Outputting a corresponding duty control signal having a duty gradient of β2 for T3, which is a set time for completely engaging the shift stage to the second shift stage, when it is determined that the shift stage to the target shift stage is completed. Wow; And performing a D section to terminate all duty control when T3, which is the set time, is completed.

1 is a power off 4 → 2 skip down shift shift control duty pattern diagram of an automatic transmission according to the prior art.

Figure 2 is a power off 4 → 2 skip down shift shift control duty pattern diagram of an automatic transmission according to an embodiment of the present invention.

3 is a block diagram of a power-off 4 → 2 skip down shift shift control apparatus of an automatic transmission according to an exemplary embodiment of the present invention.

4A and 4B are flowcharts illustrating an operation of a power-off 4 → 2 skip down shift shift control method of an automatic transmission according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a power-off 4 → 2 skip down shift shift control duty pattern diagram of an automatic transmission according to an exemplary embodiment of the present invention. 3 is a block diagram of a power-off 4 → 2 skip down shift shift control apparatus of an automatic transmission according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the configuration of a power-off 4 → 2 skip down shift shift control apparatus of an automatic transmission according to an exemplary embodiment of the present invention includes a vehicle driving state sensing means 10, a control means (TCU) 20, and a drive. Means 30.

The driving state detecting means 10 of the vehicle functions to detect a signal that is variable and output according to the driving state of the vehicle and output the corresponding electric signal. The vehicle driving state detecting means 10 detects the degree of opening of a throttle valve whose opening / closing state is variable in association 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 rotation of the vehicle. The vehicle speed detection unit 12 which detects the number and outputs a corresponding signal corresponding to the traveling speed of the vehicle, and when the shift stage is changed according to the throttle valve opening amount and the vehicle speed, detects the variable state of the shift stage and A shift stage sensing unit 13 for outputting a signal, a turbine shaft rotation speed sensing unit 14 for sensing a rotation speed of a turbine shaft of a torque converter connected to an input shaft of an automatic transmission, and outputting a corresponding signal; It includes an engine speed detection unit 15 for detecting the rotational speed of the crankshaft variable according to the operating state and outputs a corresponding signal.

The control unit 20 receives and reads the electric signal output from the vehicle driving state detecting unit 10, and when the power-off 4 → 2 skip down shift shift control signal is output, the power-off 4 → 2 skip is stored in the memory. After setting the downshift shift control duty signal and outputting the corresponding duty during the initial fill time, if the initial fill time has elapsed, the duty value is output as Db1 and the slope is β1. TCU (Transmission Control Unit) which outputs a duty control signal with a correction of Δd and a slope of β2 at the time of shift synchronization at the time of shift synchronism and outputs the duty for a set time after shift synchronization is completed. )to be.

The driving means 30 is an actuator that receives the duty control signal output from the control means 20 to release the hydraulic pressure of the end clutch at four speeds, and controls and couples the hydraulic pressure of the rear clutch at two speeds.

4A and 4B are flowcharts illustrating operations of a power-off 4 → 2 skip down shift shift control method of an automatic transmission according to an exemplary embodiment of the present invention.

With reference to Figs. 2 to 4b attached to the control method of the power-off 4 → 2 skip down shift shift control apparatus of the automatic transmission made by the above configuration will be described in detail.

First, when the rear clutch and the kick-down brake are coupled and a power-off 4 → 2 skip-down shift shift control signal is output in accordance with the driver's deceleration in a vehicle driving at 4 speeds, the control means 20 shifts the shift stage to 2 speeds. It is determined whether the power-off 4 → 2 skip gown shift shift control signal for skip down shift shifting is output (S100).

When the power-off 4 → 2 skip-down shift shift control signal is output for shifting down the shift stage from 4 to 2 speeds, the control means 20 skips the power-off 4 → 2 skip stored in the memory. A downshift shift control signal is set and output to the driving means 30 (S110).

Therefore, as the control means 20 outputs the power-off 4 → 2 skip down shift shift control signal, the control means 20 releases the end clutch at 4 speed pressure and controls the hydraulic pressure of the rear clutch at 2 speed pressure. The duty period is output as 100% during T2, which is the initial fill time time to perform (S120 to S130), and when the initial fill time T2 has elapsed (S140), the duty cycle is reduced to 0% during the set time tf. (S15 0 to S170).

When tf, the initial fill time set in step S170, elapses, the control means 20 outputs a duty control signal having a duty value Db1 and a duty gradient β1 to the driving means 30 (S180).

At this time, the hydraulic pressure supplied to the rear clutch is duty-controlled by PCSV-B, and gradually supplied, and the hydraulic pressure of the kick-down brake is maintained in the current state.

As shown in the accompanying FIG. 2, as the duty control signal outputs the duty value Db1 and the duty gradient β1, the turbine rotation speed Nt starts to increase gradually, and thus the shift stage is shifted to the target shift stage. To start.

Therefore, the control means 20 detects the point of time when the gear shift stage starts shift synchronizing to the target gear shift stage, and if the point of time at which the gear shift gear shifts to the target gear shift stage is detected, the control means 20 adjusts the duty to Δd to drive the drive means 30 Completion of section B outputting to step (S190).

In the above-described method for detecting the timing at which the shift stage is shifted to the target shift stage,? Nt1, which is a value of the shift synchronizing timing of the set target shift stage, is determined from the output speed of the shift control signal at the current rotation speed value (true Nt). When the rotation speed value Nt4ss of the turbine is less than or equal to the value calculated by the calculation, it is determined that the shift stage starts shift synchronizing to the target shift stage.

(DELTA Nt1 is a set value at the time when the shift stage starts shift synchronizing to the target shift stage, actual Nt is the rotation speed of the current turbine, and Nt4ss is the rotation speed value of the turbine at the beginning of the shift.)

However, if the timing at which the shift stage is shifted to the target shift stage is not detected, the control means 20 determines the corresponding duty of the section B until the timing at which the shift stage is synchronized to the target shift stage is detected. Continue to print

As the timing at which the shift stage starts shifting to the target shift stage is detected, the control means 20 correcting the duty to Δd drives the duty control signal having the duty value as Δd and the slope as β2. Performs the C section to output to (S200).

As described above, as the duty control signal having the duty value Δd and the slope β2 is outputted, the control means 20 determines whether the shift stage is shifted to the target shift stage (S210).

)에서 실제 터빈 회전수의 값(Nt)을 연산하여 산출한 값보다 크거나 같을 때변속단이 변속동기시점에 도달한 것으로 판단한다.In the above method, the shift stage determines whether the shift synchronism is completed at the target shift stage. The value? Nt2 of the set turbine rotation speed at the completion of the shift synchronization is the change rate of the turbine rotation speed (

), It is determined that the shift stage has reached the shift start time when the value (Nt) of the actual turbine speed is greater than or equal to the calculated value.

)는 No × 2기어비이고, 실Nt는 현재의 터빈의 회전수값이다.)(In the above, ΔNt is the shift synchronization completion time of the set target shift stage,

) Is the No x 2 gear ratio, and actual Nt is the rotational speed value of the current turbine.)

If it is determined that the shift stage to the target shift stage is completed in the above, the control means 20 controls the corresponding duty to set the duty slope to be β2 for T3, which is a set time for completely engaging the shift stage to the second speed stage. After outputting the control signal (S220 ~ S240), when T3, the time set in the step (S240) is finished, all duty control is terminated and the rear clutch is fully engaged, and then operates with the kick-down brake to shift the speed to 2 speed. One vehicle is driven (S250).

However, when the shift stage is not completed in the step S210 to the target shift stage, the control means 20 continuously controls the duty of the section C until the shift stage is completed to the target shift stage. Perform.

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, the apparatus for controlling the power-off 4 → 2 skip-down shift shift control of the automatic transmission according to the embodiment of the present invention and the method thereof include coupling the rear clutch when the power-off 4 → 2 skip-down shift shift control signal is output from the control means. The duty cycle of the output duty of the PCSV B is adjusted to output a low value of the duty value Db1 for synchronizing the shift stage to the target shift stage, to advance the shift start point, and to actually shift the shift stage to the target shift stage. The duty is corrected and outputted by Δd at the point of time, and the shift response signal that is actually shifted to the target shift stage is improved by the shift control signal output from the control means, thereby eliminating the shift shock and thereby improving the riding comfort. In addition, there is an effect that can improve the durability of the automatic transmission.

Claims (6)

In the power-off 4 → 2 skip down shift shift control device of a vehicle equipped with an automatic transmission, A throttle valve opening degree detection unit for detecting an opening degree of a throttle valve whose opening / closing state is variable in conjunction with the accelerator pedal operation state of the vehicle and outputting a corresponding signal, and detecting the output shaft rotational speed of the vehicle to correspond to the traveling speed of the vehicle Vehicle speed detection unit for outputting the corresponding signal, the shift stage detection unit for detecting the shift stage variable state and outputs the corresponding signal when the shift stage is variable according to the opening amount and the throttle valve opening amount, and connected to the input shaft of the automatic transmission Turbine shaft rotation speed detection unit that detects the turbine shaft rotational speed of the torque converter and outputs the corresponding signal, and engine heaters that detect the rotational speed of the crankshaft which is variable according to the operating state of the engine and output the corresponding signal It comprises a detection unit, and detects the signal output from each of the detection unit according to the driving state of the vehicle W corresponding to an electrical signal output by the vehicle traveling state detection means; When the power off 4 → 2 skip down shift shift control signal is output, the power off 4 → 2 skip down shift shift control duty signal stored in the memory is output. When the initial fill time elapses after outputting the corresponding duty during the initial fill time, the duty value is set to Db1, the duty is outputted when the shift stage is shifted to the target shift stage. Control means (TCU) for correcting Δd and outputting a duty control signal having a slope of β2, outputting the corresponding duty for a set time when the transmission is completed, and ending all duty control; And a driving means for receiving the duty control signal output from the control means to release the hydraulic pressure of the four-speed end clutch and controlling and coupling the hydraulic pressure of the two-speed rear clutch. 4 → 2 skip down shift shift control. In the power-off 4 → 2 skip down shift shift control method of a vehicle equipped with an automatic transmission, Detecting an output state of a power-off 4 → 2 skip down shift shift control signal for skipping downshifting the shift stage to the second speed according to the driver's deceleration will in a vehicle traveling at four speeds; Setting and outputting a power-off 4 → 2 skip-down shift shift control signal stored in a memory when the power-off 4 → 2 skip down shift shift control signal is output; According to the power-off 4 → 2 skip down shift shift control signal, the duty is outputted as 100% during the set initial fill time T2, and when the initial fill time T2 elapses, the duty is 0 for the set time tf. Performing a section A which is lowered to% and outputted; Outputting a duty control signal having a duty value of Db1 and a duty gradient of β1 when tf, the set initial fill time time, elapses; Detecting a time point at which the shift stage starts shifting to the target shift stage by outputting a duty control signal having the duty value Db1 and the duty gradient β1; Completing the section B if the timing at which the shift stage starts shifting to the target shift stage is detected; Performing a C section for outputting a duty control signal having a duty value Δd and a slope β2 as the shift stage detects the time when the shift starts to the target shift stage and corrects the duty to Δd; Determining whether the shift stage is completed at the target shift stage by outputting a duty control signal having a duty value? D and a slope? 2; Outputting a corresponding duty control signal having a duty slope of β2 for T3, which is a set time for completely engaging the shift stage to the second shift stage, when it is determined that the shift stage to the target shift stage is completed. Wow; And performing a section D for terminating all duty control when T3, which is the set time, is terminated. The method of claim 2, further comprising: continuously performing duty control of the C section until the shift stage is completed in the target shift stage, when the shift stage is not completed in the target shift stage. A power-off 4 → 2 skip down shift shift control method of an automatic transmission. The method of claim 2, wherein when the transmission stage determines whether the transmission is completed at the target transmission stage, the value? Nt2 of the turbine speed set at the completion of the transmission synchronization is the change rate of the turbine speed (

Power shift 4 → 2 skip of the automatic transmission, characterized in that it comprises the step of determining that the shift stage has reached the shift synchronizing time when it is greater than or equal to the value calculated by calculating the actual turbine value Nt. How to control downshift shifting.

(DELTA Nt is the shift synchronization completion time of the set target shift stage,

) Is the No x 2 gear ratio, and actual Nt is the rotational speed value of the current turbine.)} 3. The shift control signal according to claim 2, wherein? T1, which is a value of the shift synchronization time point of the target shift stage, is set when the shift stage detects a shift point starting to shift to the target shift stage. 4 → 2 skip down of the automatic transmission comprising the step of determining that the shift stage starts shift synchronizing to the target shift stage when the rotation speed value (Nt4ss) of the turbine at the output point is less than or equal to the calculated value Shift shift control method.

(DELTA Nt1 is a set value at the time when the shift stage starts shift synchronizing to the target shift stage, actual Nt is the rotation speed of the current turbine, and Nt4ss is the rotation speed value of the turbine at the beginning of the shift.)} The method of claim 2, wherein when the shift stage starts shifting to the target shift stage, the corresponding duty of the section B is continuously output until a shift timing of the shift stage is synchronized to the target shift stage is detected. A power-off 4 → 2 skip down shift shift control method of an automatic transmission, characterized in that it comprises a step of performing.

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