KR100267306B1 - Transmission control device and method - Google Patents

Abstract

PURPOSE: A device and a method for controlling a speed change in an automatic transmission are provided to improve shift quality according to combination of one way clutch while protecting endurance of the one way clutch. CONSTITUTION: A kick-down servo switch(10) detects a released state of a kick-down band brake for converting into an electric signal. A vehicle speed sensor(20) detects speed of a vehicle for converting into an electric signal. A turbine rpm(revolutions per minute) sensor(30) detects an rpm of a turbine for converting into an electric signal. A timer(40) supplies an information signal for time. Input terminals of a micro controller(50) are connected to output terminals of the kick-down servo switch, the vehicle speed sensor, the turbine rpm sensor, and the timer. An input terminal of a speed change driving unit is connected to an output terminal of the micro controller.

Description

Shift control device of automatic transmission vehicle and control method thereof

Fig. 1 is a speed diagram of the first speed and second speed of the conventional automatic transmission.

FIG. 2 is a duty pattern diagram of a shift control device of a conventional automatic transmission vehicle.

3 is a speed diagram of the first speed and the second speed of the automatic transmission according to the embodiment of the present invention.

FIG. 4 is a circuit diagram of a shift control device of an automatic transmission vehicle according to an embodiment of the present invention; FIG.

FIG. 5 is a duty pattern diagram of a shift control device of an automatic transmission vehicle according to an embodiment of the present invention.

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

DESCRIPTION OF THE REFERENCE NUMERALS

10: kick down servo switch 20: vehicle speed sensor

30 Turbine speed sensor 40: Timer

50: micro controller 60:

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic transmission control device and a control method thereof, and more particularly, wheel clutch is used to prevent the shift shock caused by sudden engagement of the one-way clutch and to protect the durability of the one-way clutch. 0001] The present invention relates to a shift control device for an automatic transmission vehicle and a control method thereof.

Depending on the person driving the car, especially the novice driver, it is difficult to connect the clutch pedal, the accelerator pedal, the shift lever, etc., and it takes a lot of time to master it.

In addition, even if a person who is very skilled in driving is traveling a long distance, or when traveling in a complex urban area with a lot of traffic, these operations become frequent and easily tired.

It is an automatic transmission that automates this clutch and gear shifting operation in place of a person. The automatic transmission allows the driver to operate only with the accelerator pedal and the brake pedal, thereby realizing an easy drive that is easy to operate even without an expert.

1 shows a speed diagram of a first speed and a second speed in an automatic transmission equipped with a conventional automatic transmission.

1, the power train of a conventional automatic transmission uses a forward sun gear (FSG) as input and an annulus gear (AG) as output A kick down band brake that holds a reverse sun gear (RSG) as a reaction force component of the second speed state is used and a one-way clutch CR is used as a reaction force element of the first speed state use. In Fig. 1, Ti is the input torque, and Jiai is the inertia moment of the rotating body such as engine and torque converter.

In the power train as shown in FIG. 1, a duty pattern as shown in FIG. 2 is applied to a pressure control solenoid valve (PCSV) When the brake is released, only the input torque Ti and the moment of inertia Jiai of the rotating body exist in the torque acting on the speed diagram of the second speed. In this case, the input torque Ti is close to zero, and the input speed of the speed line is decreased by the moment of inertia Jiai of the rotating body, and the entire speed line is lowered The one-way clutch CR is in a freewheel state.

Therefore, when the conventional automatic transmission vehicle is downshifting from the second speed to the first speed, there is a freewheeling state in which the speed change state is not the second speed but the first speed. In this state, the driver suddenly depresses the accelerator pedal to operate the throttle valve There is a problem that a one-way clutch is suddenly engaged and a shift shock is generated. Also, in this process, there is a disadvantage that the durability of the one-way clutch is impaired.

It is an object of the present invention to solve the above-mentioned problems and disadvantages of the prior art as described above, and it is an object of the present invention to provide a shift control device for a vehicle, Way clutch to prevent the shifting shock caused by sudden engagement of the one-way clutch and also to protect the durability of the one-way clutch, and a control method thereof.

In order to achieve the above object, a shift control device of an automatic transmission vehicle according to the present invention includes a kick down servo switch for detecting a release of a kick down band brake and converting the kick down band brake signal into an electric signal, A vehicle speed sensor that detects the speed of the vehicle and converts it into an electrical signal and outputs the electrical signal, a turbine speed sensor that senses the rotational speed of the turbine and converts it into an electrical signal and outputs the electrical signal, And a signal input from the kick-down servo switch, the vehicle speed sensor, the turbine speed sensor, and the timer, while the one-way clutch is in the freewheel state when shifting from the second speed to the first speed A microcontroller (microcontroller) for outputting a control signal for establishing a 1-speed state by allowing the low / and a shift driving unit for automatically setting a duty ratio according to a control signal input from the microcontroller.

In order to achieve the above-mentioned object, a shift control method for an automatic transmission vehicle according to the present invention comprises the steps of: determining whether a shift down from a second speed to a first speed is performed in a power- Determining whether the first end flag is set when the down state is set and outputting a duty ratio of 100% if the first end flag is not set; reading the signal input from the kick down servo switch, Determining whether or not the second end flag is set and outputting a duty ratio at a constant value equal to or less than 100% when the second end flag is not set; Determining whether the differential value of the turbine speed is equal to or greater than a predetermined value, setting the second end flag when the differential value is equal to or greater than a predetermined value, A step of judging whether or not a start flag is set when the start flag is not set, a step of determining whether or not the start flag is set when the end flag is not set, Determining whether the calculated slip value is equal to or greater than a predetermined value after calculating a slip value, and outputting a third end when the calculated slip value is equal to or less than a predetermined value, Determining whether the timer is equal to or greater than a predetermined value, outputting a value obtained by subtracting a predetermined value from a previous duty ratio when the flag is not equal to or greater than a predetermined value, .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

3 is a speed diagram of the first and second gears of the automatic transmission according to the embodiment of the present invention.

As shown in the figure, the power train of the automatic transmission according to the embodiment of the present invention uses the forward sun gear (FSG) as the input, the analus gear (AG) as the output, Way clutch CR and the low / reverse brake L / B are used as reaction force elements of the first-speed state using a kick-down band brake holding the sun gear RSG.

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

4, the configuration of the shift control device of the automatic transmission vehicle according to the embodiment of the present invention includes a kick-down servo switch for detecting the release of the kick-down band brake and converting the kick- A vehicle speed sensor 20 for detecting the speed of the vehicle and converting it into an electric signal and outputting the electric signal, a turbine speed sensor (not shown) for detecting the speed of the turbine, A timer 40 for providing an information signal with respect to time and an input terminal at an output end of the kickdown servo switch 10, the vehicle speed sensor 20, the turbine speed sensor 30 and the timer 40, And a speed change drive unit 70 having an input terminal connected to an output terminal of the microcontroller 50.

The microcontroller 50 uses an analog-to-digital converter and a built-in memory.

6 is an operational flowchart of a shift control method of an automatic transmission vehicle according to an embodiment of the present invention.

As shown in FIG. 6, a shift control method for an automatic transmission vehicle according to an embodiment of the present invention includes a step S10 of starting operation when power is applied, (S20) of judging whether or not a shift-down operation is being performed, a step (S30) of judging whether or not a first ending flag is set when a shift-down operation is performed, and a step (S50) of determining whether the kick-down servo switch is turned on by reading a signal input from the kick-down servo switch, and a step (S50) of outputting a duty ratio of 100% A step S70 of judging whether or not the second end flag is set, and a step S70 of judging whether or not the second end flag is set. If the second end flag is not set, A step S90 of judging whether the differential value of the turbine rotational speed is equal to or more than a predetermined value, a step S100 of setting the second end flag when the differential value of the turbine rotational speed Nt is equal to or more than a predetermined value, A step S110 of judging whether or not a third end flag is set, a step S120 of judging whether a start flag is set when the third end flag is not set, (S130) of setting a start flag after outputting a predetermined value to the previous duty ratio when the start flag is set, subtracting a constant value from the previous duty rate when the start flag is set (S140), calculating a sleep value A step S160 of determining whether the calculated slip value is equal to or greater than a predetermined value, a step S190 of setting a third end flag when the calculated slip value is equal to or less than a predetermined value, A step S180 of subtracting a predetermined value from the previous duty rate when the timer is not equal to or greater than a predetermined value and outputting the reduced value to a step S200 when the timer is equal to or greater than a predetermined value, And a returning step S210.

The operation of the shift control apparatus of the automatic transmission vehicle and the control method thereof according to the embodiment of the present invention are as follows.

When the power is applied, the microcomputer 50 executes the operation procedure shown in FIG. 6, which is programmed and stored in the internal memory of the microcontroller 50, so that the automatic transmission according to the embodiment of the present invention The operation of the shift control device is started (S10).

When the operation is started, the microcontroller 50 determines whether the shift down from the second speed to the first speed is started in the power off state (S20). The power-off state means a state in which the vehicle drives the engine.

As shown in FIG. 5, when the shift-down is performed in the power-off state at the time tl, the microcontroller 50 determines whether the first end flag FINISH_FLAG1 of the internal memory is set (S30). If the first end flag FINISH_FLAG1 is set, it means that the section A in FIG. 5 is terminated.

If the first end flag FINISH_FLAG1 is not set, the microcontroller 50 outputs the control signal to the speed change drive unit 60 so that the duty ratio becomes 100% (S40). Section A of Figure 5 shows that the duty ratio is output at 100%.

Next, the microcontroller 50 reads a signal input from the kickdown servo switch 10 and determines whether the kickdown servo switch 10 is turned on (S50).

As shown in FIG. 5, when the kick-down servo switch 10 is turned on at time t2, the microcontroller 50 determines that the kick-down band brake has been released completely. In order to end the section A, The flag FINISH_FLAG1 is set (S60)

Next, the microcontroller 50 determines whether the second end flag FINISH_FLAG2 of the internal memory is set (S70). If the second end flag FINISH_FLAG2 is set, it means that the section B in FIG. 5 is finished.

When the second end flag FINISH_FLAG2 is not set, the microcontroller 50 outputs a control signal to the speed change drive section 60 so that the duty ratio becomes a constant value D_b of 100% or less (S80) . The section B in FIG. 5 shows that the duty ratio is outputted as a constant value (D_b) of 100% or less.

Next, the microcontroller 50 reads a signal input from the turbine speed sensor 30 and determines whether the differential value of the turbine speed Nt is equal to or greater than a predetermined value beta (S90).

5, when the differential value of the turbine speed Nt at the time t3 is equal to or greater than a predetermined value?, The microcontroller 50 determines that the fill of the row / reverse brake is completed , The second end flag FINISH_FLAG2 is set to end the section B (S100).

Next, the microcontroller 50 determines whether the third end flag FINISH_FLAG3 is set (S110). If the third end flag (FINISH_FLAG3) is set, it means that the section C is terminated in FIG.

If the third end flag FINISH_FLAG is not set, the microcontroller 50 determines whether the start flag START_FLAG is set (S120). When the start flag START_FLAG is not set, the microcontroller 50 outputs the control signal to the speed change drive unit 60 so that the duty ratio plus the predetermined value? Dc is outputted to the previous duty ratio last_D, The start flag START_FLAG is set (S130). The first part of the section C in FIG. 5 shows that the duty ratio is changed from D_b to last_D + ΔDc and outputted. When the start flag START_FLAG is set, the microcontroller 50 outputs the control signal to the speed change drive unit 60 so that the duty ratio of the previous duty rate last_D is subtracted from the predetermined value ramp_Dc (S140) . The section C in FIG. 5 shows that the duty ratio is changed from last D + Dc to last D-ramp Dcc and is outputted.

Next, the microcontroller 70 calculates the target turbine speed using the signal input from the vehicle speed sensor 20, and calculates the slip value SLIP (SLIP) using the actual turbine speed input from the turbine speed sensor 30, (S150). The target turbine speed is calculated as (first gear ratio x vehicle speed), and the slip value SLIP is calculated as (target turbine speed - actual turbine speed).

Subsequently, the microcontroller 50 determines whether the calculated slip value SLIP is equal to or greater than a predetermined value (set to 100 in the embodiment of the present invention) (S160). When the calculated slip value SLIP is equal to or less than a predetermined value, the microcontroller 50 determines that the synchronization of the row / reverse brakes is completed, and sets the third end flag FINISH_FLAG3 to end the section C (S170 ).

Next, the microcontroller 50 reads a signal input from the timer 40 and determines whether the timer value is equal to or greater than a constant value t_d (S180). If the timer value is equal to or greater than a predetermined value (t_d), it means that the D section is terminated in FIG.

When the timer value is not equal to or greater than the constant value t_d, the microcontroller 50 outputs a control signal to the speed change drive unit 60 so that the duty ratio that subtracts the constant value? Dd from the previous duty rate last_D is outputted (S190). The section D in FIG. 5 shows that the duty ratio is changed from last_D-ramp_Dc to last_D-ΔDd and outputted.

However, when the value of the timer 40 is equal to or greater than the predetermined value t_d, the microcontroller 50 determines that engage of the low / reverse brake has been completed and ends the shifting to end the D section (S200), and returns (S210). As described above, in the embodiment of the present invention, when the one-way clutch is in the freewheel state in the case of downshifting from the second speed to the first speed, the engine is shifted to the first speed state by using the low & reverse brake Way clutch can be prevented, and the durability of the one-way clutch can be protected. The present invention can provide a shift control device for an automatic transmission vehicle and a control method thereof. Such effects can be utilized by those skilled in the art without departing from the gist of the present invention in the field of automatic transmission control devices.

Claims (4)

A kick-down servo switch that detects the release of the kick-down band brake and converts it into an electrical signal, and a kick-down servo switch that detects the speed of the vehicle and converts it into an electric signal, A timer for providing an information signal with respect to time, and a timer for providing a time signal when the one-way clutch is in the freewheel state in the case of shifting from the second speed to the first speed, , A kick-down servo switch, a vehicle speed sensor, a turbine speed sensor, and a timer. The microcontroller outputs a control signal for establishing a 1-speed state by allowing a low / The duty ratio is set in accordance with the control signal input from the controller, Wherein the automatic transmission includes a shift control portion that automatically shifts the output of the automatic transmission to a predetermined speed. The shift control device of an automatic transmission according to claim 1, wherein the microcontroller includes an internal analog / digital converter and a memory. The automatic transmission according to claim 1, wherein said automatic transmission uses a forward sun gear as an input, A kick-down band brake that uses an analous gear as an output and holding a reverse sun gear as a reaction force element of a second-speed state is used, and a one-way clutch and a low / reverse brake are used as a reaction force element of a first- A shift control device of an automatic transmission vehicle. When the operation is started, it is judged whether or not the shift-down from the second speed to the first speed is performed in the power-off state. In the case where the shift-down is performed, Outputting a duty ratio of 100% when the kick-down servo switch is not on; reading a signal input from the kick-down servo switch to determine whether the kick-down servo switch is turned on; And outputting a duty ratio at a constant value equal to or less than 100%; and a step of determining whether the differential value of the turbine speed is equal to or greater than a predetermined value, 2 end flag is set; and a step of judging whether or not the third end flag is set. If the third end flag is not set, A step of setting a start flag after outputting an addition of a predetermined value to an old duty when the start flag is not set, and a step of setting a start flag to a previous duty ratio when the start flag is set Calculating a slip value, determining whether the calculated slip value is equal to or greater than a predetermined value, and setting a third end flag when the calculated slip value is equal to or less than a predetermined value, determining whether the timer is equal to or greater than a predetermined value, And if it is not equal to or greater than a predetermined value, outputting a value after subtracting a predetermined value from the previous duty ratio; and returning after terminating the shifting if the predetermined value is not less than a predetermined value.