KR100206018B1 - Transmission control method - Google Patents

Abstract

The present invention relates to a shift control method of an automatic transmission, comprising: determining whether a power-off up shift transmission signal is output as a driver manipulates an accelerator pedal while driving; Determining whether the state of the power is changed from the power-off to the power-on when the power-on upshift shifting signal is output; Determining whether a power on down shift shift control signal is output when the state of the power is changed from power off to power on; Determining whether the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine when the power on down shift shift control signal is output; When the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine, the duty initial value and the duty stored in the memory map according to the opening amount of the throttle valve are calculated by calculating the time elapsed when the duty control signal is output. Setting a slope, a duty output time, and the like, outputting a power-on-shift shift control signal with a corresponding duty control signal, and outputting a duty control signal to perform a shift to determine whether the shift stage reaches the target shift stage. Judging; When the shift stage reaches the target shift stage, a new duty value is calculated by ± compensating the correction duty value α with the current duty value, the hold time of the target shift stage is selected, and the hold time of the target shift stage is selected. Selecting a hold time slope of a target shift stage; Determining whether the hold time elapsed after the shift stage reaches the target shift stage has passed the predetermined hold time; When the hold time elapsed after the shift stage reaches the target shift stage has passed the predetermined hold time set in the above, the step of ending all the duty to return to the main routine, the shift during the shift occurs If it is determined that the initial shift stage is completed, the next shift is performed after a certain time has elapsed, thereby improving the shifting feeling in the lift pull-up shift, and improving the shifting reliability and the durability of the automatic transmission during shifting. There is.

Description

Shift control method of automatic transmission

The present invention relates to a shift control method of an automatic transmission, and more particularly, to reduce the control time when the upshift shift occurs in the shift stage when the accelerator pedal is released while the vehicle is being shifted during shifting by frequent operation of the accelerator pedal. The present invention relates to a shift control method of an automatic transmission for shifting without shift shock when generated.

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. Fatigue can be reduced, and an engine stall does not occur due to malfunction or inexperience of a driver while driving, so that even a beginner can easily operate a driving operation.

Therefore, the automatic transmission is converted to a port according to the driver's shift lever selection position to receive fluid pressure from the oil pump, and the operating state of the hydraulic valve is changed by the fluid pressure so that any one gear stage of the shift gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element for selecting stages.

The action of the planetary gear arrangement is switched in accordance with the selective operation of the friction element consisting 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 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 friction elements consisting of a clutch or a brake. Let's do it.

Therefore, the driver changes the accelerator pedal while driving with a vehicle equipped with an automatic transmission that performs the above operation, and the shift stage is shifted to 3 speeds immediately during the shift of the lift foot-up shift. If the driver was driving with the accelerator pedal halfway while shifting to the second speed, the shift stage again traveled with the upshift shifting from the second speed to the third speed.

However, the above-described conventional technique is to control the release hydraulic pressure (speed 3) while the speed change step is kicked down from 3 to 2 speeds while the driver steps on the accelerator pedal while driving at 3 speeds. If the gearshift stage generates the upshift shifting from the 2nd speed to the 3rd speed immediately, the apply pressure is controlled to stop the duty control from the kickdown 3rd speed to the 2nd speed and release the release hydraulic pressure. As the upshift duty control from the 2nd speed to the 3rd speed is carried out, and the hydraulic pressure is increased according to the application pressure control, as shown in the attached FIG. have.

Therefore, in order to solve the above-mentioned conventional problems, as shown in the accompanying FIG. 2, if a shift occurs during shifting and is determined to be an initial shift stage, the present shift is completed and the next shift is performed after a predetermined time has elapsed. In addition, the present invention provides a shift control method of an automatic transmission having an effect of improving shifting feeling during a shift pull-up shift, and improving shifting reliability and automatic transmission durability during shifting.

According to an aspect of the present invention, there is provided a method of determining a power-off shift shift signal as a driver operates an accelerator pedal while driving; Determining whether the state of the power is changed from the power-off to the power-on when the power-on upshift shifting signal is output; Determining whether a power on down shift shift control signal is output when the state of the power is changed from power off to power on; Determining whether the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine when the power on down shift shift control signal is output; When the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine, the duty initial value and the duty stored in the memory map according to the opening amount of the throttle valve are calculated by calculating the time elapsed when the duty control signal is output. Setting a slope, a duty output time, and the like and outputting a power-up shift shift control signal with a corresponding duty control signal; Determining whether the shift stage reaches the target shift stage as the duty control signal is output and the shift is performed; When the shift stage reaches the target shift stage, a new duty value is calculated by ± compensating the correction duty value α with the current duty value, selecting a hold time of the target shift stage, and tilting the hold time of the target shift stage. Selecting; Determining whether the hold time elapsed after the shift stage reaches the target shift stage has passed the predetermined hold time; When the hold time elapses after the shift stage reaches the target shift stage, the predetermined hold time has elapsed, ending all the duty and returning to the main routine.

1 is an automatic transmission shift control pattern of the prior art.

2 is a shift control pattern 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 a flowchart illustrating a shift control method 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. 1, the shift control apparatus for an automatic transmission according to an embodiment of the present invention is configured to output a corresponding electric signal by receiving a signal that is output by varying the state of the vehicle according to an operation state of the vehicle. Vehicle operating state sensing means 10; The fill time and the initial duty value are set separately when the first shift lever is converted from the N range to the D range or the R range after the engine is started by reading the signal output from the vehicle operation state detecting means 10. To improve the shift response response and the feeling of shifting, and to change the shift range from the N range to the D range, select the fill time correction value and the correction duty according to the time stayed in the N range when shifting the shift stage, and perform the fill time correction and duty correction Shift control means 20 for outputting a control signal; It consists of a driving means 30 for synchronizing the shift stage by receiving a duty control signal output from the shift control means 20.

In the above, the vehicle operation state detection means 10, the throttle valve opening degree detection unit 11 for detecting the degree of opening of the throttle valve whose opening and closing state is variable in conjunction with the operation state of the accelerator pedal and outputs a corresponding signal; ; A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal; A shift stage detecting 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; A turbine shaft rotation shaft sensing unit 15 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; The shift lever detection unit 16 detects that the shift lever position is changed by the driver and outputs a corresponding signal.

In the shift control method of the automatic transmission according to the embodiment of the present invention, the shift stage is shifted to the second shift speed when the shift stage is shifted from 2 to 4 speeds when the accelerator pedal is powered off by the driver. An example of shifting without time shift shock will be described.

As the driver manipulates the accelerator pedal while driving, the shift control means 20 determines whether a power-off up shift shift signal is output (S100).

When the power-on upshift shifting signal is output, the shift control means 20 determines whether the state of the power is changed from the power-off to the power-on (S110).

However, when the power-on shift control signal is not output in the above, the control means 20 returns to the main routine.

When the state of the power is changed from the power-off to the power-on in the above, the control means 20 determines whether the power on down shift shift control signal is output (S120).

When the power on down shift shift control signal is output, the control means 20 determines whether the RPM Nt of the current turbine is smaller than the RPM of the target turbine (S130).

When the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine, the control means 20 calculates the time elapsed at the time when the duty control signal is output and stores it in the memory map according to the opening amount of the throttle valve. The stored duty initial value, the duty gradient, the duty output time, and the like are set, and the power-up shift shift control signal is output to the driving means 30 with the corresponding duty control signal (S140).

However, when the RPM (Nt) of the current target turbine is larger than the RPM of the target turbine, the control means 20 immediately shifts the power-on-up shift to the second speed, which is the full speed shift stage, as shown in FIG. It performs (S131).

As the duty control signal is output and the shift is performed, the control means 20 determines whether the shift means has reached the target shift stage (S150). When the shift stage reaches the target shift stage, the control means 20 calculates a new duty value by ± correcting the corrected duty value α to the current duty value, selects a hold time of the target shift stage, and target shift The hold time slope of the stage is selected (S160).

However, when the shift stage does not reach the target shift stage, the control means 20 returns to step S140 of outputting a power-on-up shift duty control signal.

Therefore, it is determined whether the hold time elapsed after the shift stage reaches the target shift stage has elapsed the predetermined hold time (S170).

When the hold time that has elapsed since the shift stage reaches the target shift stage has passed the predetermined hold time set above, the control means 20 ends all the duty and returns to the main routine (S180).

However, if the predetermined hold time has not elapsed, the control means 20 continues to output the duty until the set hold time has elapsed.

In addition, when the state of the power does not vary from the power-off to the power-on in step (S110), the control means 20 determines whether the current turbine RPM is smaller than the target RPM plus the correction value α (S111). .

When the current turbine RPM is smaller than the target RPM plus the correction value α, the control means 20 sets the initial duty value, the duty slope, the duty output time, and the like in the duty control map of the memory, so that the corresponding duty control signal Outputs the actual shift control signal to the driving means 30, and determines whether the shift stage has reached the target shift stage (S112).

However, when the current turbine RPM is larger than the target RPM plus the correction value α, the controller returns to the main routine without performing duty control.

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 shift occurs during shifting and is determined as the initial shift stage, the present shift is completed after a predetermined time has elapsed, thereby improving the shifting feeling during the lift pull-up shift, It is possible to provide a shift control method of an automatic transmission having an effect of improving reliability of shifting speed and durability of an automatic transmission.

Claims (4)

Determining whether a power-off upshift shifting signal is output as the driver operates the accelerator pedal while driving; Determining whether the state of the power is changed from the power-off to the power-on when the power-on upshift shifting signal is output; Determining whether a power on down shift shift control signal is output when the state of the power is changed from power off to power on; Determining whether the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine when the power on down shift shift control signal is output; When the RPM (Nt) of the current turbine is smaller than the RPM of the target turbine, the duty initial value and the duty stored in the memory map according to the opening amount of the throttle valve are calculated by calculating the time elapsed when the duty control signal is output. Setting a slope, a duty output time, and the like and outputting a power-up shift shift control signal with a corresponding duty control signal; Determining whether the shift stage reaches the target shift stage as the duty control signal is output and the shift is performed; When the shift stage reaches the target shift stage, a new duty value is calculated by ± compensating the correction duty value α with the current duty value, selecting a hold time of the target shift stage, and tilting the hold time of the target shift stage. Selecting; Determining whether the hold time elapsed after the shift stage reaches the target shift stage has passed the predetermined hold time; And if the hold time elapsed after the shift stage reaches the target shift stage has passed the predetermined hold time set above, ending all the duty and returning to the main routine. Shift control method. 2. The method of claim 1, further comprising: determining whether the current turbine RPM is less than the target RPM plus the correction value α when the state of power does not vary from power off to power on; When the current turbine RPM is smaller than the target RPM plus the correction value α, the initial duty value, duty slope, duty output time, etc. are set in the duty control map of the memory to output the corresponding duty control signal to control the actual shift. And outputting a signal and determining whether the shift stage has reached the target shift stage. The shift control method of an automatic transmission according to claim 2, comprising returning to the main routine without performing duty control when the current turbine RPM is larger than the target RPM plus the correction value α. The shift control method according to claim 1, further comprising performing a power-on upshift shifting directly to the entire shift stage when the current turbine RPM (Nt) is greater than the RPM of the target turbine.