KR100302716B1 - Device and method for controlling shifting of automatic transmission - Google Patents

Abstract

PURPOSE: A shift control apparatus of an automatic transmission and a method thereof are provided to stabilize shifting by restricting run-up shock in varying into the power-on state during power-off skip shifting from 4 to 2-range. CONSTITUTION: A shift control device of an automatic transmission is composed of a travel state detecting unit(10) outputting an electric signal by detecting the signal according to the travel state; a control unit(20) setting a power-off 4 to 2 skip shift control signal in powering on during power-off 4 to 2 skip shifting by reading the electric signal from the travel state detecting unit, and finishing the duty control after outputting the duty by setting the gradient according to the throttle valve opening degree in turning off an idle switch; and a driving unit(30) receiving the duty control signal from the control unit and performing power-on 4 to 2 skip shifting. Shifting is performed stably by preventing run-up shock.

Description

Transmission control device and method of automatic transmission

The present invention relates to a shift control apparatus and a method of an automatic transmission. More specifically, in an automobile equipped with an automatic transmission, a shift pedal is converted to a second range without stepping on the accelerator pedal during four-speed driving. Transmission control device and method for automatic transmission to prevent excessive Run Up Shock that occurs when the gear shift stepping is changed to power-on 4 → 2 skip shift during power-off 4 → 2 skip shift will be.

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 within a shift range set according to the traveling speed of the vehicle and the opening amount of the throttle valve.

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 a control signal applied 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 so that automatic shifting operation can be performed.

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 signal output to perform valve port change 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 composed 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 a vehicle equipped with the automatic transmission operated as described above, the shift lever is shifted to the second range without stepping on the accelerator pedal during four-speed driving. When the power-on state is changed, conventionally, the power-off 4 → 2 skip shifting stored in the memory is continued even if the power state is changed from the off state to the on state.

However, the related art has a problem in that excessive run-up shock occurs as the power-off 4 → 2 skip shift is continuously performed even when the state of the power is changed from off to on.

Accordingly, an object of the present invention is to solve the above problems, the shift lever is shifted to the second range immediately without stepping on the accelerator pedal during the four-speed run, the pedal shifts immediately to the power-off 4 → 2 skip shift If the state of the power is changed to the on state, as shown in FIG. If the power state change is detected in a section other than section A of the power-off 4 → 2 control, when the time t1 elapses when the idle switch is turned on and off, the duty of the PCSV is decreased to dc and the throttle valve is opened. By setting the slope according to the measurement value and outputting the corresponding duty to the driving means, excessive run-up even when the power state is changed to the on state during power-off 4 → 2 skip shifting. It is an object of the present invention to provide a shift control apparatus and a method of an automatic transmission having an effect of performing a stable shift without a shock (Rup Up Shock).

1 is a duty pattern diagram for shift control of an automatic transmission according to an embodiment of the present invention;

2 is a block diagram of a shift control apparatus of an automatic transmission according to an embodiment of the present invention;

3 is a flowchart illustrating a shift control method of an automatic transmission according to an exemplary embodiment of the present invention.

The present invention for achieving the above object,

Vehicle driving state detection means for detecting a signal that is variable and output according to a driving state of the vehicle and outputting the signal as a corresponding electric signal;

When the power state is changed to the on state during the power-off 4 → 2 skip shifting operation, the power-off 4 → 2 skip shift control duty signal stored in the memory is set. When the idle switch is changed from the on state to the off state, the duty cycle is reduced by a certain amount of time, and the slope is set according to the opening amount of the throttle valve. Control means;

And a driving means for receiving the duty control signal outputted from the control means to perform power on 4 → 2 skip shifting.

Another invention for achieving the above object,

Determining whether a power-off 4 → 2 skip-down shift shift request signal is output at the shift stage when the shift pedal is shifted to the second range while the accelerator pedal is not depressed while driving at 4 speeds;

When the power-off 4 → 2 skip down shift shift request signal is outputted above, the power-off 4 → 2 skip down shift shift control signal stored in the memory is output, and whether the idle switch is changed from the on state to the off state? Judging;

In the above case, when the state of the idle switch is changed from the on state to the off state, the driver presses the accelerator pedal immediately after shifting the shift lever, and determines that the power state is changed from the off state to the on state. Determining whether a time of t1, which is a set reference time, has elapsed after being changed to an off state;

Correcting the duty value to dc when t1, the predetermined reference time elapses after the idle state is changed from the off state to the on state;

Determining whether the value of the current throttle valve opening amount TPS is smaller than Th1 which is the first reference value as the duty value dc is corrected;

In the case where the current opening amount value TPS of the throttle valve is smaller than Th1 which is the first set reference value, setting the duty slope to α1 and outputting the corresponding duty to terminate all the duty It is done.

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 Figure 2 attached to the shift control apparatus of the automatic transmission according to an embodiment of the present invention,

A vehicle driving state sensing means 10 which detects a signal that is variable and output according to a driving state of the vehicle and outputs the signal as a corresponding electric signal;

Power-off 4 → 2 skip shift control duty stored in the memory when the state of power is changed to the on state during power-off 4 → 2 skip shifting by receiving and reading the electric signal output from the vehicle driving state detecting means 10 When the idle switch is changed from the on state to the off state while setting the signal, the duty cycle decreases by a certain amount of time and then the slope is set according to the opening amount of the throttle valve. Control means 20 to terminate the;

The driving means 30 receives the duty control signal output from the control means 20 and performs a power-on 4 → 2 skip shift.

In the above configuration, the vehicle driving detecting means 10

A throttle valve opening degree detection 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 the 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 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;

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 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;

A shift lever detecting unit 16 for detecting a position varying according to a shift lever of a driver and outputting a corresponding signal;

It includes an idle switch detection unit 17 for detecting that the operation state of the idle switch is changed according to the driver's accelerator pedal operation and outputs a corresponding electric signal.

The control means 20 may be any means operating as described above, but may be, for example, a conventional transmission control unit (TCU) programmed to perform the logic.

The drive means 30 includes a plurality of solenoid valves for performing a shift, and in particular, a pressure control solenoid valve (hereinafter referred to as "PCSV") for regulating oil pressure flowing into the transmission. It includes. The coupling structure of the plurality of solenoid valves can be arbitrarily set as known by the structure of a conventional automatic transmission.

The duty of the PCSV is determined to the extent that the hydraulic pressure is released. That is, when the duty is 100%, the hydraulic pressure is completely released, and when the duty is 0%, the oil is supplied into the transmission without decreasing the pressure of the oil pump.

The shift control method will be described in detail with reference to the accompanying drawings when the state of the power is changed to the ON state during the power-off 4 → 2 downshift by the operation of the accelerator pedal immediately after conversion of the shift lever of the automatic transmission made by the above configuration. do.

The control means 20 determines whether a power-off 4 → 2 skip-down shift shift request signal is output at the shift stage when the accelerator pedal is switched immediately to the second range while the accelerator pedal is not pressed during four-speed driving. (S100).

When the power-off 4 → 2 skip down shift shift request signal is output in the above, the control means 20 outputs the power-off 4 → 2 skip down shift shift control signal stored in the memory to the driving means 30 ( S110).

Therefore, as shown in FIG. 1, the control means 20 outputs the duty for power-off 4 → 2 skip-down shift shifting to the PCSV, which is the driving means 30.

Thus, the control means 20 determines whether the idle switch is changed from the on state to the off state (S120).

That is, the step of determining whether the state of the idle switch is changed from the on to the off state is a step of determining whether the state of the power is changed from the off state to the on state as the driver presses the accelerator pedal immediately after the shift lever is converted. .

Therefore, it is determined whether the time of t1 which is the set reference time elapses after the state of the idle switch is changed from the on state to the off state (S130).

The reason for determining whether the time of t1, the set reference time elapses after the idle switch is changed from the on state to the off state, that is, the state of the power is changed from the off state to the on state is caused by the driver. When the power state is changed from the off state to the on state, the output of the engine does not appear immediately, and the output of the engine appears normally after a predetermined time (t1) has elapsed. t1 was set.

By the way, in the above, the elapsed time from the idle switch off time is compared with the reference time t1. Alternatively, the elapsed time elapsed from the time when the throttle opening amount becomes more than the set value Thw1 after the idle off is compared with the reference time t1. It is desirable to compare.

When the idle switch is not changed from the on state to the off state in S120, the control unit 20 outputs the power-off 4 → 2 skip down shift shift control signal stored in the memory to the driving unit 30. Step S110 is continued.

Therefore, when the idle state is changed from the off state to the on state, when the predetermined reference time t1 elapses, the control unit 20 lowers the duty value to dc as shown in FIG. 1 (S140).

After the duty value is lowered (S140), as the shift progresses, the duty ratio of the PCSV is decreased and controlled, but the duty reduction rate is controlled differently according to the throttle opening amount.

That is, as the duty value is lowered to dc, the control means 20 determines whether the current value of the throttle valve opening amount TPS is smaller than Th1 which is the first reference value (S150).

When the opening amount value TPS of the current throttle valve is smaller than Th1 which is the first set reference value, the control means 20 sets the duty slope to α1 and drives the duty control signal lowered to the dc value above. It outputs to PCSV which is means 30, and complete | finishes all duty (S151).

However, when the opening amount value TPS of the current throttle valve is larger than Th1 which is the first set reference value, the control means 20 determines that the opening amount value TPS of the current throttle valve is larger than Th2 which is the second set reference value. It is determined whether it is greater than or equal to (S160).

When the opening amount value TPS of the current throttle valve is greater than or equal to Th2, which is the second set reference value, the control means 20 sets the duty slope as α3 and sends the corresponding duty control signal to the driving means 30 PCSV. After outputting the control, all duty control ends (S161).

However, when the opening amount value TPS of the current throttle valve is smaller than Th2 which is the second set reference value and larger than or equal to Th1 which is the first set reference value, the control means 20 controls the corresponding duty by setting the duty slope to α2. After outputting the signal to the PCSV which is the driving means 30, all duty control ends (S170).

As described above, the duty gradient between α1, α2, and α3 determined according to the throttle valve opening amount value TPS is set such that the relationship of α1 <α2 <α3 is satisfied so that the duty reduction rate increases as the throttle opening amount increases. It is desirable to be.

The duty inclination α shown in FIG. 1 is output to the driving means 30 by dividing the duty inclination into α1, α2, and α3 as described above according to the value of the throttle valve opening amount of the current vehicle.

However, when the power-off 4 → 2 skip down shift shift control request signal is not output in step S100, the control means 20 returns to the main routine to perform the corresponding shift 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, in the embodiment of the present invention, the shift lever is shifted to the second range while the accelerator pedal is not stepped on during the four-speed driving. If it is changed to the ON state, as shown in FIG. 2, an SS section A of the power-on control is immediately performed, and if the power is turned off from ON except for the A section, PCSV after time t1 has elapsed when the idle switch is turned on and off. By lowering the duty to dc and setting the slope according to the opening amount value of the throttle valve and outputting the corresponding duty to the driving means, excessive run-up even when the power state is changed to on during power-off 4 → 2 skip shifting It is possible to provide a shift control apparatus and a method of an automatic transmission having an effect of performing a stable shift without a run up shock.

Claims (6)

A vehicle equipped with an automatic transmission, comprising: a vehicle driving state detecting means for detecting a signal that is variable and output according to a driving state of the vehicle and outputting the signal as a corresponding electric signal; Drive means for shifting a duty control signal; And When the electric signal output from the vehicle driving state sensing means is received and judged whether a power-off 4 → 2 skip-down shift shift request signal is output from the shift stage based on the received electric signal, it is stored in the memory when the request signal is output. A shift control apparatus for an automatic transmission comprising control means for outputting a power-off 4 → 2 skip-down shift shift duty control signal. The control means, after outputting the power-off 4 → 2 skip down shift shift control signal stored in the memory, changes the idle switch from the on state to the off state when the idle switch is changed from the on state to the off state. After the time of t1, which is the set reference time, has been changed, the duty value is corrected to the set dc, and from the corrected duty value dc, the duty value is decreased and controlled by the reduction rate set by the throttle valve opening amount. Shift control of automatic transmission. The apparatus of claim 1, further comprising: a throttle valve opening amount detection unit configured to detect an opening degree of a throttle valve whose opening / closing state is variable in association with an operation state of the accelerator pedal, and output a corresponding signal; A vehicle speed detection unit configured to detect an output shaft rotation speed of the vehicle and output a corresponding signal corresponding to the traveling speed of the vehicle; A shift stage sensing unit 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; A turbine shaft rotational speed sensing unit configured to detect a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and output a corresponding signal; An engine rotation speed detection unit configured to detect a rotation speed of the crankshaft which is varied according to an operation state of the engine and output a corresponding signal; A shift lever detector for detecting a position that is variable according to a driver's shift lever and outputting a corresponding signal; The shift control device of the automatic transmission comprising an idle switch detection unit for detecting that the operating state of the idle switch is changed in accordance with the driver's accelerator pedal operation and outputs a corresponding electric signal. Determining whether a power-off 4 → 2 skip-down shift shift request signal is output at the shift stage according to the step of immediately shifting the shift pedal to the second range while the accelerator pedal is not depressed while driving at four speeds; When the power-off 4 → 2 skip down shift shift request signal is outputted above, the power-off 4 → 2 skip down shift shift control signal stored in the memory is output, and whether the idle switch is changed from the on state to the off state? Judging; In the above case, when the state of the idle switch is changed from the on state to the off state, the driver presses the accelerator pedal immediately after shifting the shift lever, and determines that the power state is changed from the off state to the on state. Determining whether a time of t1, which is a set reference time, has elapsed after being changed to an off state; Correcting the duty value to dc when t1, the predetermined reference time elapses after the idle state is changed from the off state to the on state; Reducing the duty value from the corrected duty value dc by a reduction rate set by the throttle valve opening amount; Shift control method of an automatic transmission, characterized in that comprises a. The method of claim 3, wherein the reduction rate setting, When the opening amount value TPS of the current throttle valve is less than the first set reference value, the opening amount value TPS is set to a first decrease rate, and when the current throttle valve value is less than the first set reference value and less than the second set reference value, the second decrease rate is set. The shift control method of an automatic transmission, characterized in that it is set to the third reduction rate, if the set reference value or more. The method of claim 4, wherein the second reduction rate is set to be equal to or greater than the first reduction rate, and the third reduction rate is set to be equal to or greater than the second reduction rate. 4. The automatic transmission of claim 3, further comprising returning to a step of outputting a power-off 4 → 2 skip down shift shift control signal stored in a memory when the idle switch is not changed from an on state to an off state. Shift control method.

Images