KR100290380B1 - Device and method for transmission control in forward transmission during backward transmission of automatic transmission - Google Patents

Abstract

PURPOSE: A connecting clutch of a first speed transmission of forward moving during a backward moving is connected smoothly without a severe rocking or a connection shock to stabilize a transmission. CONSTITUTION: A driving state sensing member(10) receives signals variable by the driving state of the automobile, and outputs a corresponding electrical signal. A control member(20) receives the outputted signal of the driving state sensing member(10). If a transmission control signal while forward-moving first speed transmission during a rear moving is outputted, the control member(20) feedback controls a turbine rotation changing rate to converge to an object turbine rotation changing rate. When the rotation change of the turbine changes from a forward direction to a backward direction by an increase of a corresponding torque of the connecting side, the turbine rotation change rate is multiplied with a minus value after the turbine rotation change rate changes from a minus value to a plus value to feedback control the connection side clutch. A driving member(30) connects the connection side clutch according to a duty control signal outputted by the control member(20).

Description

Shift control device and its method during forward shift of reverse transmission of automatic transmission

The present invention relates to a shift control apparatus and a method for shifting forward during an automatic shift of an automatic transmission. More specifically, the shift lever of a coupling side clutch is shifted during a forward 1-speed shift by varying a shift lever during reverse driving in an automatic transmission vehicle. Backshifting of the automatic transmission to perform smooth transmission by reducing the severe shift shock caused by engaging the coupling side clutch with line pressure without hydraulic control to the above coupling clutch by engaging the shift stage with smooth shift by back control. The present invention relates to a shift control apparatus and a method thereof.

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, a vehicle equipped with an automatic transmission in which an operating state is controlled according to hydraulic pressure as described above does not need an operation of a clutch pedal to cut off power from an engine in order to change an operating state of a corresponding shift gear. It is possible to reduce the driving fatigue of the engine, and the engine stall is not generated due to the driver's malfunction or immature driving during driving, so that even the beginner can easily operate the driving.

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 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. In turn, the hydraulic state supplied from the oil pump controls the operating state of the actuating friction element for selecting one of the gear stages of the gear stage of the transmission gear mechanism.

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 for stable driving. Achieve a state.

In the case of the forward shifting operation during the reverse driving in the automatic transmission operating as described above, the vehicle speed of the traveling vehicle is set to 0, and then the shift stage is changed to the D range, which is the forward shifting stage, and then the forward speed driving is performed.

However, when the driver suddenly changes the shift lever to the D-range, which is the forward shift stage, while driving the vehicle in the reverse direction, the underdrive clutch, which is a clutch in the shift stage 1 speed, is driven. As the clutch is fastened to the line pressure without hydraulic control, there is a problem of severe fluctuation and shift shock when shifting.

Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and as shown in the accompanying FIG. 2, when the driver changes the shift lever to the D range in the reverse driving vehicle, the hydraulic pressure of the forward 1 speed coupling side is increased. To control the duty, the shift control signal is output and at the same time the rate of change of the turbine speed is controlled to converge to the rate of change of the target turbine speed, and the coupling torque is increased so that the rate of change of the turbine speed is controlled from the forward direction to the reverse direction. The negative value of the turbine speed change rate since the derivative value of the turbine speed change ratio is changed from negative (+) to positive (+) to enable the feedback control in the same manner as the actual physical phenomenon. Multiply by to control the clutch on the coupling side at all times, so that the clutch on the coupling side will be It intended to smooth tightening without binding shock to provide a variable speed during advance of the reversing of the automatic transmission shift control apparatus and method having the effect for providing a stabilized byeonsokgam.

The present invention for achieving the above object,

Vehicle driving state detection means for receiving an output signal in which the state of the vehicle is varied according to the driving state of the vehicle and outputting a corresponding electric signal;

When the shift control signal is outputted when the vehicle shifts to the forward 1 speed during the reverse direction when the signal output from the vehicle driving state sensing means is read and outputted, the turbine rotation rate change rate is set to the target turbine rotation speed according to the detected value of the turbine rotation rate change rate. Feedback control to converge to the rate of change, and the differential torque of the change rate of the turbine speed is negative so that the feedback can be controlled in the same way as the actual physical phenomenon. Control means for controlling the coupling clutch to always be fed back by multiplying the derivative value of the turbine speed change rate after the time of the transition from (-) to positive (+) by a negative value (-);

And driving means for smoothly engaging the engagement side clutch according to the duty control signal output from the control means.

Another invention for achieving the above object is,

Determining whether the shift condition at the time of forward shifting while reversing is satisfied when the shift lever is changed from the R range to the D range according to the driver's shift will;

Outputting a duty control signal for forward shift control during reverse by setting an initial duty value, a slope and a duty output time set in the memory when the shift condition at the time of forward shifting during reverse is satisfied;

The duty control signal (SS) for the forward shifting during the reverse direction is output in the above, when the set fill time (Ft) has elapsed, the corresponding duty correction is performed according to the duty control value stored in the memory, and the shift stage is moved forward 1 speed. Determining whether an actual shift point SB has been reached;

If it is determined that the shift stage has reached the point SB at which the speed is actually shifted to the forward 1 speed, R → is stored in the memory so that the rate of change dNt of the turbine reaches the rate of change dNi of the target turbine. Outputting a feedback control duty signal at D shift;

If the inflection point according to the change rate (dNt) of the turbine is detected, calculating a derivative value (dNt_New) of the change rate of the turbine speed and performing continuous feedback control;

It is determined whether the rate of change of the turbine speed reaches the synchronization completion point FF of the forward 1 speed shift stage in performing continuous feedback control by the derivative value dNt_New of the rate of change of the turbine speed calculated above. Making a step;

When the rate of change of the new turbine rotation speed reaches the synchronous completion time (F.F) of the forward 1 speed shift stage, it is characterized in that it comprises the step of ending all duty control after a certain time has elapsed.

Figure 1 (a) is a graph of the relationship between the output shaft rotation speed (No) and the turbine rotation speed (Nt) at the time of the forward shift in the reverse of the conventional automatic transmission,

(b) is a duty control pattern diagram when shifting a battery during reverse of a conventional automatic transmission,

(c) is a graph of the relationship between the engine speed change (dNi) and the turbine speed change (dNt) during the forward shift of the conventional automatic transmission,

(d) is a graph of output shaft torque change in the forward shift during the reverse of the conventional automatic transmission,

Figure 2 (a) is a graph of the relationship between the output shaft rotation speed (No) and the turbine rotation speed (Nt) during the forward shift of the automatic transmission according to an embodiment of the present invention,

(b) is a duty control pattern diagram during the forward shift of the automatic transmission according to the embodiment of the present invention,

(c) is a graph of the relationship between the engine speed change (dNi) and the turbine speed change (dNt) during the forward shift of the automatic transmission according to the embodiment of the present invention,

(d) is a graph of the output shaft torque change during the forward shift of the automatic transmission according to an embodiment of the present invention,

3 is a block diagram of a shift control apparatus at the time of the forward shift of the automatic transmission according to an embodiment of the present invention,

4 is a flowchart illustrating an operation of shift control during forward shifting of the automatic transmission according to the 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. 3, the configuration of the shift control apparatus during the forward shift of the reverse transmission of the driven transmission according to the embodiment of the present invention,

A vehicle driving state sensing means 10 which receives a signal that is varied in the state of the vehicle and outputs a corresponding electric signal according to the driving state of the vehicle;

When the shift control signal is output during the first speed shift of the battery while receiving and reading the signal output from the vehicle driving state sensing means 10, the turbine rotation rate change rate is set according to the detected value of the turbine rotation rate change rate. Feedback control to converge to the rate of change of rotation speed, and the differential torque of the rate of change of turbine speed to enable feed back control in the same way as the actual physical phenomenon at the moment when the rotational change of the turbine is controlled in the reverse direction from the forward direction due to the increase of the torque on the coupling side. Control means (20) for controlling the coupling clutch to always be fed back by multiplying the derivative value of the turbine speed change rate after the time point at which the value is changed from negative (-) to positive (+) by a negative (-) value;

It consists of a drive means 30 for smoothly engaging the coupling side clutch in accordance with the duty control signal output from the control means 20.

In the above, the vehicle driving state detection means 10,

A throttle valve opening detection unit 11 for detecting an opening degree of a throttle valve whose opening / 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 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;

A turbine shaft rotational speed sensing unit 14 for sensing the 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;

The shift lever detecting unit 16 detects a variable position according to the shift lever operation of the driver and outputs a corresponding signal.

The shift method of the shift control apparatus at the time of the forward shift of the automatic transmission made by the above configuration will be described in more detail with reference to FIG. 4.

The operation of the automatic transmission when the vehicle is in the reverse state uses the reverse clutch as an input element and the low rev brake as a reaction force element so that the corresponding output elements operate.

Therefore, in the automatic transmission operating as described above, when the engine is in reverse driving with the idle state, when the shift lever is in the reverse range, the D-range 1-speed shift is performed at the R range in which the shift lever is backward, the control means ( 20) it is determined whether the shift lever is changed from the R range to the D range according to the driver's shift will (S100).

When the shift lever is changed from the R range to the D range by the driver's shifting intention above, the control means 20 determines whether the throttle valve opening amount is equal to or less than the set reference value (S110).

That is, it is determined whether the state of the vehicle engine is an idle state.

When the state of the vehicle engine is an idle state and the value of the throttle valve opening amount is equal to or less than the set reference value, the control means 20 sets the range in which the value of the output shaft speed No, which is the vehicle speed of the vehicle, is in the reverse state. It is determined whether it is included (S120).

However, when the state of the vehicle engine is not the idle state and the value of the throttle valve opening amount is not less than the set reference value, the control means 20 returns to the main routine to perform normal shift control.

Therefore, if the value of the output shaft rotation speed No in which the vehicle is in the idling state belongs to 50 RPM <No <350 RPM, which is a setting range in the low speed state, the control means 20 is shown in FIG. As shown below, the underdrive is an engagement clutch for changing the shift stage to the forward shift stage by setting the initial duty value, the slope of the duty, the duty output time, etc. and outputting the duty control signal for the forward shift control during reverse operation. Start to control the clutch (Under Drive Clutch) (S130).

As the duty control signal for controlling the engagement-side clutch is output as described above, the control means 20 starts to detect the rotation rate Nt change rate of the turbine as shown in FIG.

When the duty control signal S.S for the forward shifting in the reverse direction is output in the above, the control means 20 continuously outputs the corresponding duty control signal for the set fill time Ft (S140).

In outputting the duty control signal during the fill time Ft set above, the control means 20 is the release clutch, the reverse clutch outputs the duty control signal for controlling the underdrive clutch, and gradually increases the hydraulic pressure. Start to release.

The control means 20 for outputting the duty control signal during the set fill time Ft time determines whether the set fill time Ft that has been output has elapsed (S150).

When the set fill time Ft has elapsed, the control means 20 performs the corresponding duty correction according to the duty control value stored in the memory to reduce the output oil pressure of the coupling clutch to the set reference value (S160). .

After the set fill time Ft has elapsed, the control means 20 performing duty correction according to the duty control value stored in the memory detects the rate of change of the turbine speed and shifts the gears by the operation of the coupling clutch. It is determined whether the point SB actually shifted to the forward 1 speed is reached (S170).

At this time, as shown in (d) of FIG. 2, the torque of the output shaft No starts to rise, and the hydraulic pressure of the release clutch is completely released.

When it is determined that the shift stage due to the operation of the coupling side clutch reaches the point SB at which the actual speed is shifted at the forward 1 speed, the control means 20 determines that the rate of change of the turbine dNt is the rate of change of the revolution speed of the target turbine ( The feed back control duty signal, which is stored in the memory to reach dNi), is output to the driving means 30 at the time of shift shift R → D (S180).

At this time, as shown in Fig. 2D, the charge torque of the underdrive clutch, which is the engagement side clutch, gradually increases.

In the above, the control means 20 for performing the feedback control at the time of the shift R → D stored in the memory so that the rate of change dNt of the turbine reaches the rate of change of speed dNi of the target turbine is attached. As shown in a), it is determined whether the inflection point controlled in the reverse direction is detected when the rotational speed change rate dNt of the turbine rotates in the forward direction and the value decreases to 0 (S190).

When the rotation rate change rate (dNt) of the turbine rotates in the forward direction and the decreasing value becomes zero, and the inflection point controlled in the reverse direction is detected, the control means 20 allows the feed back to be performed in the same manner as the actual physical phenomenon. As shown in (c) of FIG. 1, the new turbine speed change rate (dNt_New) is multiplied by the minus value (-1) multiplied by the turbine speed change rate (dNt_Olds) output after the time when the turbine speed change rate becomes negative to positive. ) (200.

dNt_ ≠ w = dNt_OldsTIMES (-1)

(In the above dNt_New is the rate of change of the new turbine speed after the inflection point according to the present invention,

dNt_Olds is the rate of change of turbine speed since the conventional inflection point,

(-1) is a constant value for calculating with the turbine revolution rate after the inflection point in order to obtain a new turbine revolution rate.)

However, when the rotation rate change rate (dNt) of the turbine rotates in the forward direction and decreases to zero, and the inflection point controlled in the reverse direction is not detected, the turbine returns to the main routine to perform normal shift control.

Therefore, as shown in FIG. 2 (c) attached by the new turbine speed change rate dNt_New calculated above, the turbine speed change rate becomes negative (-) so that the coupling clutch can always control the feedback. The control performs a continuous feedback control (S210).

The control means 20 for performing continuous feedback control by the new turbine speed change rate dNt_New determines whether or not the change rate of the new turbine speed reaches the synchronous completion point of the forward 1 speed shift stage (SF). (S220).

That is, when the underdrive clutch, which is the coupling side clutch, is completely engaged and acts as an input element, and the low reverse brake acts as a reaction force element, it is to determine a time point at which the first forward speed is completely output by the set output element.

When the rate of change of the new turbine rotation speed reaches the synchronous completion point of the forward 1 speed shift stage, the control means 20 performs all duty control after a predetermined time elapsed so that the hydraulic pressure is completely supplied to the coupling clutch. End (FF) (S230).

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 shift stage is changed to the forward driving stage by the driver's shifting will in the vehicle in which the engine is set to the idling state, the hydraulic pressure at the forward 1 speed coupling side is controlled. In order to output the shift control signal and simultaneously control the feed back so that the rate of change of the turbine speed converges with the rate of change of the target turbine speed, the torque of the coupling side is increased so that the rate of change of the turbine speed is controlled from the forward direction to the reverse direction. As shown in the actual physical phenomenon, the coupling clutch is multiplied by multiplying the turbine speed deterioration rate by the negative value after the point of time when the turbine speed change rate is changed from negative (+) to positive (+). By controlling to feed back all the time, the clutch on the coupling side is smoothly shifted without severe rock As a result, it is possible to provide a shift control apparatus and a method for shifting forward during reverse shift of an automatic transmission having an effect of providing a stable shift feeling.

Claims (8)

Vehicle driving state detection means for receiving a vehicle state signal that is variable and output according to a vehicle driving state and outputs a corresponding electric signal; When the shift control signal is output during the first forward speed shifting while receiving and reading the signal output from the vehicle driving state sensing means, the turbine rotation rate change rate is the target turbine rotation rate change rate according to the detection value of the turbine rotation rate change rate. The feed back control is converged to, and the turbine torque change rate is negative (-) to enable the feed back control as the actual physical phenomenon at the moment when the rotational torque of the coupling side is increased and the rotational change of the turbine is controlled in the reverse direction from the forward direction. Control means for controlling the coupling clutch to always be fed back by multiplying the turbine speed change rate after the point of time by which the value is changed from positive to negative; And a driving means for smoothly engaging the engagement-side clutch according to the duty control signal output from the control means. The apparatus of claim 1, further comprising: a throttle valve opening degree detecting unit configured to detect 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 output a corresponding signal; A vehicle speed detector for detecting a driving speed of the vehicle and outputting a corresponding signal; 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 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 configured to detect a rotational speed of the crankshaft which is varied according to an operating state of the engine and output a corresponding signal; A shift control apparatus for moving forward of an automatic transmission, comprising a shift lever detecting unit detecting a position that is variable according to a driver's shift lever and outputting a corresponding signal. Determining whether the shift condition at the time of forward shifting while reversing is satisfied when the shift lever is changed from the R range to the D range according to the driver's shift will; Outputting a duty control signal for forward shift control during reverse by setting an initial duty value, a slope and a duty output time set in the memory when the shift condition at the time of forward shifting during reverse is satisfied; The duty control signal (SS) for the forward shifting during the reverse direction is output in the above, when the set fill time (Ft) has elapsed, the corresponding duty correction is performed according to the duty control value stored in the memory, Determining whether an actual shift point SB has been reached; If it is determined that the shift stage has reached the point SB at which the speed is actually shifted to the forward 1 speed, R → is stored in the memory so that the rate of change dNt of the turbine reaches the rate of change dNi of the target turbine. Outputting a feedback control duty signal at D shift; In the above, the turbine speed change rate (dNt) is output as a feedback duty control signal corresponding to the R → D shift is stored in the memory so that the turbine change rate (dNt) reaches the rotation speed change rate (dNi) of the target turbine. Detecting an inflection point according to the present invention; If the inflection point according to the rotational speed change rate (dNt) of the turbine is detected, calculating a new turbine speed change rate (dNt_New) to perform continuous feedback control; In performing continuous feedback control by the new turbine speed change rate (dNt-New) calculated above, it is determined whether the change rate of the new turbine speed reaches the synchronization completion point (FF) of the forward 1 speed shift stage. Steps; When the rate of change of the new turbine rotation speed has reached the synchronization completion point (FF) of the forward 1 speed shift stage, the automatic transmission comprising the step of ending all duty control after a certain time has elapsed Of shift control when moving forward during retraction. The shift control method of the forward shift of the automatic transmission of claim 3, further comprising performing a normal shift if the shift condition of the forward shift during reverse is not satisfied. The shift lever is shifted from the R range to the D range by the driver, the engine is idle with the throttle valve opening amount less than or equal to the set value, and the reverse speed is performed when the vehicle speed No satisfies the set reference value. A shift control method during forward movement of an automatic transmission, comprising the step of determining the shift condition during the forward shift. The shift speed of the automatic transmission of the automatic transmission made according to claim 5, wherein the setting reference value of the output shaft rotation speed (No), which is the vehicle speed, satisfies the shift condition at the time of forward shifting in reverse when it is larger than 50 RPM and less than 350RPM in maximum. Control method. The method of detecting the inflection point according to the rotational speed change rate (dNt) of the turbine is the rotation of the turbine at the moment when the rotational speed change rate (dNt) of the turbine is rotated in the forward direction and the value is reduced to 0 is rotated in the reverse direction A shift control method during forward movement of an automatic transmission that is determined as a shift point of the number change rate (dNt). The method according to claim 3, wherein the turbine speed change rate dNt_New is calculated by multiplying the turbine speed change rate dNt_Olds by a negative value (-1) output after the time point at which the turbine speed change rate becomes positive to negative. A shift control method during forward movement of the automatic transmission, comprising the step of calculating the speed change rate (dNt_New). dNt_ ≠ w = dNt_OldsTIMES (-1) (In the above dNt_New is the rate of change of the new turbine speed after the inflection point according to the present invention, dNt_Olds is the rate of change of turbine speed since the conventional inflection point, (-1) is a constant value for calculating with the turbine revolution rate after the inflection point in order to obtain a new turbine revolution rate.)

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