KR19980045434A - Power-on 3-speed 2-speed kick-down shift control of automatic transmission - Google Patents

Abstract

The present invention relates to a two-speed kick-down shift control method for power-on three-speed automatic transmission, when the power state during the two-speed control at power-on three-speed is off, the duty value in the duty map stored in the memory To set the duty value D _F32 to prohibit primary sync, hold the duty value for the set time t _H time to control the kickdown band with low oil pressure, and the kickdown switch will be turned on and off. If the kick-down switch is turned off by keeping the duty until the shift is reduced by controlling the kick-down band by reducing the duty to the set duty gradient α% / sec and ending all duty control when the secondary synchronization is determined, By reducing shock, there is an effect of improving the shifting feeling and the riding comfort.

Description

Power-on 3-speed 2-speed kick-down shift control of automatic transmission

The present invention relates to a two-speed kick-down shift control method for power-on three speeds of an automatic transmission, and more particularly, the state of power during a kick-down shift from power-on three speeds to two speeds while a vehicle equipped with an automatic transmission is driving. The present invention relates to a two-speed kick-down shift control method for power-on three-speed automatic transmission to reduce shift shock generated when turned on and off.

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 is not generated due to a malfunction of the driver or an immature driving during driving, so that even a beginner can easily operate a driving operation.

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

The 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 rotation 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.

In a vehicle equipped with an automatic transmission operating as described above, when power is turned off during power control from power on 3-speed to 2-speed in order to increase the speed of the vehicle during driving, the control is conventionally shown in FIG. After the duty was increased to the set duty value D%, the duty control was terminated when the second speed synchronization decision B was reached.

However, the conventional technique described above, as shown in FIG. 1, when the power is turned off at the point A at the time of the second speed shifting from the power-on third speed to two speeds, the control duty is raised to a set value and then the second speed synchronization decision (point B ), There is a problem that the back clutch of the front clutch is excessively formed when the control ends, and the rotation speed of the turbine is made three speed temporarily, causing shock.

Therefore, in order to solve the above-mentioned conventional problem, as shown in the accompanying FIG. 2, when the power state is turned off during power-on 3-speed 2-speed shift control, the duty value is set in the duty map stored in the memory. Output the corresponding duty value D _F32 to prohibit the first sync, hold the duty value for the set time t _H time to control the kickdown band with low hydraulic pressure, until the kickdown switch is on to off. When the kickdown switch is turned off while maintaining the duty, the duty cycle is controlled by reducing the duty to the set duty slope α% / sec to control the kickdown band and ending all duty control when the secondary synchronization is determined. The present invention provides a method for controlling a two-speed kick-down shift control at power-on three-speed of an automatic transmission having an effect of reducing the speed and improving the riding comfort.

According to the present invention for achieving the above object, when a two-speed kickdown shift occurs at power-on three speeds while the vehicle is running, the duty initial value, duty slope, duty in the second-speed downshift control map at the third speed of the feedback back stored in the memory Setting an output time or the like and outputting the duty control signal D _U3 as shown in FIG. 2; Determining whether the power state is changed from on to off as the duty control signal is output; Setting the duty control signal D _F32 stored in the memory as a reference duty when the power state is turned off; As the duty control signal D _F32 stored in the memory is set as the reference duty and outputted, the duty output value is fixed for a period of time t _H , which is set to prohibit primary synchronization from occurring and control the kickdown band with low oil pressure. Holding it; Judging whether the kick-down switch is turned off when a time t _{H at} which the primary synchronization is prevented from occurring and the value of the duty output is held constant to control the kick-down band with low hydraulic pressure has elapsed; If the kickdown switch is turned off, reducing the duty value to α% / sec, which is a set slope, and outputting the duty slope; Determining whether a second synchronization decision is made by controlling the kickdown band by reducing the duty value to a value α% / sec set in the duty gradient; When the secondary synchronization determination is made in the above, it is characterized in that it comprises the step of ending all the duty control and return to the main routine.

1 is a duty pattern diagram of a power-on 3-speed 2-speed kickdown shift control method of a conventional automatic transmission;

2 is a duty pattern diagram of a 2-speed kickdown shift control method at a power-on 3-speed of an automatic transmission according to an embodiment of the present invention.

3 is a block diagram of a device for controlling a two-speed kick-down shift control at power-on three-speed of the automatic transmission according to an embodiment of the present invention.

4 is a flowchart illustrating a method of controlling a two-speed kickdown shift control at a power-on third speed 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 configuration of the 2-speed kick-down shift control apparatus at the power-on 3 speed of the automatic transmission according to the exemplary embodiment of the present invention may be applied by receiving a signal that is varied and output according to the driving state of the vehicle. A vehicle driving state sensing means 10 for outputting a signal; When the state of the power is turned off by receiving the signal output from the vehicle driving state detecting means 10 and outputting the duty control signal stored in the memory, holding the duty for a set time and then the kick-down switch is Control means for keeping the duty value constant from on to off and turning off the kickdown switch to reduce the duty to the set duty gradient value and thereby terminate all duty control when the secondary synchronization decision is made. 20); It consists of a driving means 30 for synchronizing the shift stage to the target shift stage by receiving a control signal output from the control means 20.

In the above, the vehicle driving 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 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 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 rotational speed sensing unit 15 for sensing a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal; Kickdown switch detection unit 16 for detecting the time when the kickdown band is started for the time control of the transmission hydraulic pressure control.

When the 2nd speed kick-down shift occurs at power-on 3rd speed while the vehicle is driving, the control means 20 sets the duty initial value, duty slope, duty output time, etc. in the 2nd speed downshift control map at the 3rd speed of the feedback stored in the memory. 2, the duty control signal D _U3 is outputted to the driving means 30 (S100).

As the duty control signal is output in the above, the control means 20 determines whether the state of the power is changed from on to off (S110).

That is, it is determined whether the opening amount of the throttle valve, which is released while the driver is stepping on the accelerator pedal, is changed from 0% or more to 0% so that the idle state is turned on.

When the state of the power is off, the control means 20 sets the duty control signal D _F32 stored in the memory as the reference duty and outputs it to the driving means 30 (S120).

As the duty control signal D _F32 stored in the memory is set as the reference duty and outputted, the control means 20 prevents the first synchronization from occurring and controls the kickdown band at low hydraulic pressure for t _H. Holds the value of the duty output constantly (S130).

The control means 20 determines whether the kick-down switch is turned off when the time t _H for preventing the primary synchronization from occurring and holding the value of the duty output constant to control the kick-down band with low hydraulic pressure has elapsed. (S140).

When the kickdown switch is turned off, the control means 20 reduces the duty value to α% / sec, which is a set slope, and outputs the duty value to the driving means 30 (S150).

However, if the kickdown switch is turned on even after the time tH for preventing the first synchronization from occurring and controlling the kickdown band with low hydraulic pressure, the time tH is constant. The output value of the duty output from the duty is kept constant until it is off (S141).

Therefore, the duty value is reduced to a value α% / sec set in the duty gradient in S150, and the control means 20 determines whether the second synchronization decision is made as the kickdown band is controlled (S160).

When the secondary synchronization determination is made in the above, the control means 20 ends all duty control and returns to the main routine.

However, if the secondary synchronization determination is not made in the above, the control means 20 continues to reduce the duty value to the set value α% / sec to make the secondary synchronization determination.

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, when the power is turned off during the 2-speed shift control at the third speed on, the duty value is set in the duty map stored in the memory and the corresponding duty value D _F32 is output to output the primary. When the kick-down switch is turned off by prohibiting synchronization, holding the duty value for the set time tH to control the kick-down band with low hydraulic pressure, and maintaining the duty until the kick-down switch is on to off, By reducing the duty to the set duty gradient α% / sec to control the kickdown band and ending all duty control when the secondary synchronization is determined, the shift shock generated during shifting can be reduced to improve shifting feeling and ride comfort. It is possible to provide a two-speed kick-down shift control method for power-on three-speed automatic transmission with an effect.

Claims (3)

When a 2nd speed kick-down shift occurs at power-on 3rd speed while the vehicle is driving, the duty initial value, duty slope, duty output time, etc. are set in the 2nd speed downshift control map at the 3rd speed back-shift control map stored in the memory and are shown in FIG. Outputting the duty control signal D _U3 as shown in the figure; Determining whether the power state is changed from on to off as the duty control signal is output; Setting the duty control signal D _F32 stored in the memory as a reference duty when the power state is turned off; As the duty control signal D _F32 stored in the memory is set as the reference duty and outputted, the first output is prevented from occurring and the duty output value is constant during tH, which is a time set to control the kickdown band with low oil pressure. Holding; Judging whether the kick-down switch is turned off when a time t _{H at} which the primary synchronization is prevented from occurring and the value of the duty output is held constant to control the kick-down band with low hydraulic pressure has elapsed; If the kickdown switch is turned off, reducing the duty value to α% / sec, which is a set slope, and outputting the duty slope; Determining whether a second synchronization decision is made by controlling the kickdown band by reducing the duty value to a value α% / sec set in the duty gradient; If the second synchronous determination is made, the step of ending all the duty control and returning to the main routine, the two-speed kick-down shift control method at the power-on three-speed of the automatic transmission characterized in that it comprises. The power of the automatic transmission according to claim 1, wherein when the secondary synchronization determination is not made, the duty cycle is continuously reduced to a setting value of α% / sec to allow the secondary synchronization determination to be made. How to control 2 speed kickdown on 3 speed. The kick-off switch according to claim 1, wherein the kick-down switch is turned on even after a time t _H that prohibits the first synchronization from occurring and constantly holds the value of the duty output to control the kick-down band with low hydraulic pressure. 2. The method of controlling a two-speed kickdown at power-on three-speed of the automatic transmission, comprising maintaining a constant output value of the duty output until the down switch is turned off.