KR100308960B1 - System and method for controlling shift of automatic transmission - Google Patents

Abstract

PURPOSE: A system and a method for controlling the shift of an automatic transmission are provided to offer a stable shifting feeling even in up-shift, to improve the durability of an automatic transmission by reducing the shifting time, and to enhance the reliability of speed change. CONSTITUTION: If a change lever is shifted by a driver in a low range, a control unit decides if the change lever is shifted to a second range or a drive range(S100). If the change lever is shifted to the second range or the drive range from the low range, the control unit decides the output of a 1-2 upshift request signal(S110). A duty control signal is outputted to a drive unit after a differential value is corrected depending on a throttle valve opening degree(S120).

Description

Transmission control device and method of automatic transmission

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control apparatus and a method of an automatic transmission, and in particular, the shift lever is shifted to 2 or D ranges by a driver in a vehicle driving on an accelerator pedal with the shift lever set to L range. The present invention relates to a shift control apparatus and a method of an automatic transmission for preventing a shift shock from occurring when a shift signal is generated from a shift stage.

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, the vehicle equipped with the automatic transmission in which the operating state is controlled according to the hydraulic pressure as described above does not require the operation of the clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. It is possible to reduce the driving fatigue of the engine, and because the engine stall (Engine Stall) due to the driver's malfunction or driving immaturity during driving, it is possible to facilitate the driving operation even for beginners.

In the automatic transmission, the torque converter changes the rotational power of the engine, and the solenoid valve is controlled by a 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 shift 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.

As shown in FIG. 1 attached to the automatic transmission operating as described above, when the driver shifts the shift lever to the 2 or D range while driving while the shift lever is in the L range and the accelerator pedal is pressed, the conventionally attached FIG. As shown in Fig. 1, the duty control stored in the memory performed the upshift shifting only at the A point.

However, the above-described conventional technique has a problem in that a substantial upshift shift may occur anywhere in the X part of the shift pattern instead of the A point on the shift pattern as shown in FIG. 2.

The reason why the shift shock occurs in the above is the derivative value C = a No + b and the derivative value D = f No + g in the duty correction method as shown in FIG.

As can be seen from the above, the duty cycle correction is performed only by the vehicle speed (No), and since there is no correction for the throttle valve opening amount, the shift time becomes longer, resulting in a shift shock at the end of the shift.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shift control apparatus and a method of providing an automatic transmission in which an upshift caused by a shift lever is always provided, improving the durability of the automatic transmission by reducing the shift time, and improving transmission reliability. To provide.

The present invention for achieving the above object, in the shift control apparatus of a vehicle equipped with an automatic transmission, in response to the operation state of the accelerator pedal of the vehicle to detect the degree of opening of the throttle valve variable opening and closing the corresponding signal The output throttle valve opening detection unit, the vehicle speed detecting unit for detecting the output shaft rotational speed of the vehicle and outputs a corresponding signal corresponding to the traveling speed of the vehicle, and if the gear stage is varied according to the throttle valve opening amount and the vehicle speed, A shift stage sensing unit for detecting a variable state of the shift stage and outputting a corresponding signal, and a turbine shaft rotation speed sensing unit for sensing a rotational speed of a turbine shaft of a torque converter connected to an input shaft of an automatic transmission and outputting a corresponding signal. And, the engine speed detection to output a corresponding signal by detecting the rotation speed of the crankshaft variable according to the operating state of the engine And a shift lever sensing unit configured to output a corresponding shift range as an electrical signal according to a driver's shift lever operation, and receive a respective signal outputted by varying the state of the vehicle according to the driving state of the vehicle. A vehicle driving state detecting unit (TCU) for outputting a corresponding electric signal; When the shift lever is changed to 2 or D range when the shift lever is in the 'on' state when the shift lever is in the 'on' state, the vehicle speed (No) and the throttle valve are opened. Control means for outputting a duty control signal for shift control to the shift stage after performing only the derivative D correction according to the change in the quantity Th; And driving means for driving the solenoid valve for shift control in accordance with the duty control signal output from the control means.

According to still another aspect of the present invention, in the shift control method of a vehicle equipped with an automatic transmission, the shift lever of the vehicle is changed to an L range and the shift lever is changed by the driver while driving while the accelerator pedal is pressed. Determining whether the shift lever is changed from an L range to a 2 or D range; Determining whether an upshift shift request signal is output when the shift lever is changed from an L range to a 2 or D range while driving; When the upshift shift request signal is output as described above, the derivative value D is corrected according to the change of the vehicle speed No and the opening amount Th of the throttle valve.

1 is a duty correction pattern diagram for shift control of a conventional automatic transmission.

2 is a shift control pattern diagram of a conventional automatic transmission.

3 is a duty correction pattern diagram for shift control of an automatic transmission according to an embodiment of the present invention.

4 is a shift control pattern diagram of an automatic transmission according to an embodiment of the present invention.

Figure 5 is a block diagram of a shift control apparatus of an automatic transmission according to an embodiment of the present invention.

6 is a control flowchart illustrating a duty correction method for shift control 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.

3 is a duty correction pattern diagram for shift control of an automatic transmission according to an embodiment of the present invention. 4 is a shift control pattern diagram of an automatic transmission according to an embodiment of the present invention. 5 is a block diagram of a shift control apparatus of an automatic transmission according to an exemplary embodiment of the present invention.

Referring to FIG. 5, a 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 20, and a driving means 30.

The vehicle driving state detecting means 10 receives a signal that is changed and outputs a state of the vehicle according to the driving state of the vehicle and outputs a corresponding electric signal. The vehicle driving state detecting means 10 includes: a throttle valve opening degree detecting 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 an accelerator pedal and outputting a corresponding signal; A vehicle speed detector 12 which detects an output shaft rotational speed of the vehicle and outputs a corresponding signal corresponding to the traveling speed of the vehicle; A shift stage sensing 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; A turbine shaft rotational speed sensing unit 14 for sensing a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the automatic transmission and outputting a corresponding signal; An engine rotation speed detection unit 15 for detecting a rotation speed of the crankshaft which is varied according to an operating state of the engine and outputting a corresponding signal; The shift lever detection unit 16 outputs a corresponding shift range as an electric signal according to a driver's shift lever operation.

The control means 20 receives and reads the signal output from the vehicle driving state sensing means 10 and changes the vehicle speed when the shift lever is changed to 2 or D range when the shift lever is in the L range. The transmission control unit (TCU) outputs a duty control signal for shift control to a corresponding shift stage after performing only the differential value D correction according to (No) and the opening amount Th of the throttle valve.

The driving means 30 is composed of an actuator for driving the solenoid valve for shift control in accordance with the duty control signal output from the control means 20.

6 is a control flowchart illustrating a duty correction method for shift control of an automatic transmission according to an exemplary embodiment of the present invention.

1 to 2 upshift shift control method will be described in more detail with reference to FIGS. 3 to 6 attached to the shift control method of the automatic transmission according to the embodiment of the present invention made by the above-described configuration.

When the shift lever of the vehicle is set to the L range and the driver shifts the shift lever while the accelerator pedal is pressed, the control means 20 determines whether the shift lever is changed from the L range to the 2 or D range (S100).

When the shift lever is changed from the L range to the 2 or D range while driving, the control means 20 determines whether a 1 → 2 upshift shift request signal is output (S110).

When the 1 → 2 upshift shift request signal is output, the control means 20 corrects the derivative value D according to the change in the opening amount of the throttle valve as shown in FIG. As shown in FIG. 4, the corresponding duty control signal is output to the driving means 30 so as to shift at point A of the shift pattern (S120).

The method of correcting the derivative D in the above is made by the arithmetic expression described below.

Derivative D = fNo + g + Correction

(Where f and g are arithmetic constants, No is a vehicle speed,

이다.)Correction value = Maximum correction value at point C

to be.)

이다.Thus, the derivative

to be.

On the other hand, when the shift lever is not variable or the upshift shift control signal is not output, the process returns to the initial stage.

As described above, the shift control apparatus and method of the automatic transmission according to the embodiment of the present invention, if the shift lever is set to L range and the driver shifts the shift lever to 2 or D range while driving with the accelerator pedal pressed, FIG. 3 is attached. As shown in FIG. 4, only the derivative value D is corrected according to the change of the vehicle speed No and the opening amount of the throttle valve, and then the shift is performed at the point A of the shift pattern as shown in FIG. Even when an upshift occurs by the lever, a stable shift feeling can be always provided and the shift time can be reduced.

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 shift control apparatus and method of the automatic transmission according to the embodiment of the present invention always provides a stable shift feeling even when an upshift is generated by the shift lever, improving the durability of the automatic transmission by reducing the shift time, and improving the shift reliability. There is an effect that can be improved.

Claims (3)

In the shift control apparatus 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 A vehicle speed detector for outputting a corresponding signal, a shift stage detector for detecting a variable state of the shift stage and outputting a corresponding signal when the shift stage is changed according to the amount of throttle valve opening and the vehicle speed, and an input shaft of an automatic transmission Turbine shaft rotation speed detection unit that detects the rotational speed of the turbine shaft of the torque converter connected to the output and outputs the corresponding signal, and the engine for detecting the rotational speed of the crankshaft variable according to the operating state of the engine and outputs the corresponding signal The shift detection unit outputs an electric signal to the corresponding shift range according to the driver's shift lever operation. Sensing member is made by including a vehicle running state and outputting the electric signal to the received signal to be supplied to each of the state of the vehicle is output varies depending on the running state of the vehicle sensing means (TCU) and; When the shift lever is changed to 2 or D range when the shift lever is in the 'on' state when the shift lever is in the 'on' state, the vehicle speed (No) and the throttle valve are opened. Control means for outputting a duty control signal for shift control to the shift stage after performing only the derivative D correction according to the change in the quantity Th; And a driving means for driving the solenoid valve for shift control in accordance with the duty control signal outputted from the control means. In the shift control method of a vehicle equipped with an automatic transmission, Determining whether the shift lever is changed from the L range to the 2 or D range when the shift lever is changed by the driver while driving while the shift lever of the vehicle is in the L range and the accelerator pedal is pressed; Determining whether an upshift shift request signal is output when the shift lever is changed from an L range to a 2 or D range while driving; And correcting the derivative value D according to the change of the vehicle speed No and the opening amount Th of the throttle valve when the upshift shift request signal is output. The method of claim 2, wherein the method of correcting the derivative D is Derivative D = fNo + g + Correction (Where f and g are arithmetic constants, No is a vehicle speed, Correction value = Maximum correction value at point C

to be.) Thus, the derivative

Shift control method of an automatic transmission, characterized in that for correcting.

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