KR20080045930A - Apparatus for learn control of automatic transmission and method thereof - Google Patents

Abstract

An apparatus for controlling learning of an automatic transmission and a method thereof are provided to supply stable transmission responsibility by applying compensated values to next transmission. An apparatus for controlling education of an automatic transmission includes a throttle opening detector(10), a speed detector(20), a turbine rotation number detector(30), a controller(40), and an actuator(50). The throttle opening detector detects variation of a throttle valve. The speed detector detects rotation numbers of engine. The turbine rotation number detector detects rotation numbers of turbine. The controller detects transmission time when kick down transmission is requested, compares the detected and target transmission times, measures turbine variation rates when deviation is generated, compares the measured and target variation rates, and compensates and learns control pressures according to the comparison results. The actuator as a solenoid valve is driven by a duty signal from the controller.

Description

Learning control device of automatic transmission and its method {APPARATUS FOR LEARN CONTROL OF AUTOMATIC TRANSMISSION AND METHOD THEREOF}

1 is a schematic configuration diagram of a learning control apparatus for an automatic transmission according to an embodiment of the present invention.

2 is a flowchart illustrating performing learning control in an automatic transmission according to an embodiment of the present invention.

FIG. 3 is a timing diagram illustrating learning correction of a control duty for a case where a response is slow during a kickdown shift in an automatic transmission according to an exemplary embodiment of the present invention.

FIG. 4 is a timing diagram illustrating learning correction of a control duty for a case in which a response during a kickdown shift is fast in an automatic transmission according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Throttle opening degree detection unit 20: Vehicle speed detection unit

30 turbine speed detection unit 40 control unit

50: Actuator

The present invention relates to an automatic transmission, and more particularly, to learn a shift response generated by hardware and software deviations during shift control of an automatic transmission, and to automatically adjust a control pressure to ensure stable shift response. It relates to a learning control device and a method of a transmission.

The automatic transmission determines the target gear shift stage from the shift pattern map table in which the shift control device is set according to the driving speed of the vehicle and the opening ratio of the throttle valve, and the duty for controlling the target shift stage is determined by the engine speed, cooling water temperature, intake temperature, Extraction takes into account correction factors such as transmission oil temperature, and the extracted duty operates a plurality of actuators (solenoid valves) to operate a plurality of operating elements consisting of clutches and brakes, thereby automatically shifting to the target shift stage. will be.

The automatic transmission has a releasing element that is deactivated in the actuated state and a coupling element that is converted into the actuated state in the deactivated state when the shift to the target shift stage is executed, each of which is controlled by hydraulic pressure. , The control of the hydraulic pressure is made by the operation of the solenoid valve according to the control signal output from the shift control unit.

The automatic transmission generates a deviation in the control pressure due to a hydraulic deviation, a machining deviation, and the like. When the hydraulic pressure acting on the release side element is high due to the deviation, the release response of the release side element is slowed to generate a shift delay.

In addition, when the shift delay is severe, the shift is delayed and then forcedly engaged by the pressure release, causing a shift shock.

However, in the conventional automatic transmission, the logic for determining and controlling the shift delay due to the deviation is not set. Thus, a problem of lowering the riding comfort and causing anxiety due to the shift delay and the shift shock frequently generated during driving is not set. There is this.

The present invention has been invented to solve the above problems, the object of which is to measure the shifting time during the kick-down shift and compare the target shifting time set and then to learn the deviation of the shifting time, thereby correcting the hydraulic pressure Shift control that converges to the target shift time is provided to ensure the same shift response at all times.

Learning control apparatus of the automatic transmission according to an embodiment of the present invention for achieving the above object,

A throttle opening degree detector for detecting a change in the opening degree of the throttle valve; A vehicle speed detection unit that detects the engine speed from the output shaft speed of the transmission; A turbine rotation speed detection unit that detects a rotation speed of the turbine that is an output with respect to the input of the engine in the torque converter; If the throttle opening degree information is a kick-down shift request, the shift time is detected and compared with the target shift time, and if a deviation occurs, the turbine change rate is measured at the synchronous point of the target shift stage, and compared with the set target change rate. A control unit for correcting and learning the control pressure supplied to the engaging side element and the releasing side element; A solenoid valve for operating the release element and the engagement side element, the actuator comprising an actuator operated in accordance with a duty signal for adjusting a control pressure applied from the control unit.

In addition, the learning control method of the automatic transmission according to an embodiment of the present invention,

Extracting a target shift stage when a kick-down shift request is detected in a state where any shift stage is synchronized; Controlling the duty of the coupling element and the release element to shift to the target shift stage, and detecting a shift time from a shift start time to a shift completion time; Determining that a shift delay is not generated by comparing the detected shift time with a set target shift time; Detecting a turbine change rate at a synchronization point of the target speed change stage and comparing it with the target turbine change rate when a shift delay occurs; And correcting the control pressure supplied to the coupling side element and the release side element according to the compared result, and learning the same.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

1 is a schematic configuration diagram of a learning control apparatus for an automatic transmission according to an embodiment of the present invention.

As shown, the present invention includes a throttle opening degree detecting unit 10, a vehicle speed detecting unit 20, a turbine speed detecting unit 30, a control unit 40 and an actuator 50.

The throttle opening degree detection unit 10 is linked to the operation of the accelerator pedal operated by the driver, detects a change in the opening degree of the throttle valve according to the operation of the accelerator pedal, and provides information about the change to the control unit 40.

The vehicle speed detection unit 20 detects the current engine speed from the output shaft speed of the transmission and provides the control unit 40 with information about it.

The turbine rotation speed detection unit 30 detects the rotation speed of the turbine, which is an output with respect to the input of the engine in the torque converter, and provides the information to the control unit 40.

The control unit 40 analyzes the information of the throttle opening degree detection unit 10 and the information of the vehicle speed detection unit 20, detects a shift time in the case of a kick-down shift request, compares it with a target shift time, and shifts after shifting. The turbine change rate at the sync point is measured and compared with the set target change rate to determine whether to learn or not.

Since the shock is caused when the turbine change rate at the synchronizing point is larger than the set target change rate, the correction amount of the control pressure is corrected to (+) according to the shock amount.

In addition, although the turbine change rate at the synchronous point is smaller than the set target change rate, if the shift time is fast, it may cause a kick-down shift shock, so that the control pressure is increased at the next shift control by the amount of time deviation compared to the target time. Learning to calibrate with).

However, when the turbine change rate at the synchronous point is larger than the set target change rate and the shift time is longer than the set target change time, the control pressure is corrected to (-).

In addition, when the shift time is longer than the set target shift time but the turbine change rate at the synchronous point is smaller than the set target change rate, the control pressure is corrected and learned by the amount of time deviation.

The actuator 50 is a solenoid valve that operates the release element and the engagement element, and is operated according to a duty signal for adjusting the control pressure applied from the control unit 40 to achieve synchronous control of the target shift stage.

The operation of correcting and learning the control pressure according to the deviation in the automatic transmission to which the one-way clutch according to the present invention including the function as described above will be described as follows.

The controller 40 detects the information applied from the throttle opening degree detecting unit 10 as the rate of change per unit time in a state of driving in synchronization with an arbitrary shift stage (S101) to determine whether the change in the opening degree of the throttle valve is a sudden kick-down shift request. It is determined (S102).

If it is determined in step S102 that the kick-down shift is not required, the current driving is maintained, and if it is determined that the kick-down shift from 4 speed to 3 speed or 3 speed to 2 speed or 4 speed to 2 speed is extracted, the target shift stage is extracted ( S103) Accordingly, the duty of the coupling element and the release element is controlled to shift to the target speed change stage (S104).

At this time, the shift time from the shift start time SS to the shift completion time SF is detected (S105), and it is determined whether the detected shift time is a condition that a shift delay occurs because it is slower than the set target shift time (S106). .

When the shift time is slower than the set target shift time in the determination of S106, the shift speed is detected, and the target shift stage detects the turbine change rate at the synchronizing point where the shift is completed and compares it with the set target turbine change rate (S107).

As a result of the comparison of S107, it is determined whether the turbine change rate of the synchronization point has a value larger than the set target turbine change rate (S108).

As a result of the determination in S108, when the turbine change rate of the synchronous point has a value larger than the set target turbine change rate, a state of shift shock is caused. Therefore, the control pressure supplied by the duty correction of the coupling element and the release element is changed according to the shock amount. If the shift time from the shift start point (SS) to the shift completion point (SF) is too long and the turbine change rate is large, the control pressure supplied to the duty compensation of the coupling element and the release element is (-). Compulsory correction is performed at S109.

The value corrected as described above is learned and stored to be applied at the next shift so that the shift control always converges to the optimum shift time and the target turbine speed (S110).

In addition, if the turbine change rate of the synchronization point is smaller than the set target turbine change rate as a result of the determination in S108, the deviation of the shift time relative to the target shift time is detected (S111). Compensate the control pressure supplied by the duty correction to (+), and if the shift time from the shift start point (SS) to the shift completion point (SF) is too long and the turbine change rate is small, the coupling element and the release side by the amount of time deviation The control pressure supplied by the duty correction of the element is forcibly corrected to negative (S112).

The value corrected as described above is learned and stored and applied at the next shift so that the shift control always converges to the optimum shift time and the target turbine speed (S113).

In correcting the control duty according to the deviation of the automatic transmission during the kick-down shift, as shown in FIG. 3, the shift response is late so that the engine speed and the turbine speed do not follow the target engine speed and the target turbine speed. If not, the control duty from the time SB at which the shift is started to the time at which the shift is completed is SF corrected by a predetermined amount is dropped.

However, as shown in FIG. 4, when the engine speed and the turbine speed exceed the target engine speed and the target turbine speed because the speed change response is fast, the shift from the start point SB to the speed change completion point SF is completed. The control duty is corrected by a certain amount of rise learning.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent embodiments thereof are possible to those skilled in the art, and are defined in the following claims. Various modifications and improvements by those skilled in the art using the basic concepts of the present invention are also within the scope of the present invention.

As described above, the present invention corrects the control pressure according to the shift time and the turbine rotational speed at the target shift stage synchronization point when the shift response is not normally provided during the kick-down shift due to the hardware and software deviation of the automatic transmission. Therefore, it is expected to provide a stable shift response that converges the target turbine speed at the optimum time by learning the corrected value and applying it to the shift of the next time.

Claims (10)

A throttle opening degree detector for detecting a change in the opening degree of the throttle valve; A vehicle speed detection unit that detects the engine speed from the output shaft speed of the transmission; A turbine rotation speed detection unit that detects a rotation speed of the turbine that is an output with respect to the input of the engine in the torque converter; If the throttle opening degree information is a kick-down shift request, the shift time is detected and compared with the target shift time, and if a deviation occurs, the turbine change rate is measured at the synchronous point of the target shift stage, and compared with the set target change rate. A control unit for correcting and learning the control pressure supplied to the engaging side element and the releasing side element; A solenoid valve for operating the release element and the coupling element, the learning control device for an automatic transmission comprising an actuator operated according to a duty signal for adjusting the control pressure applied from the control unit. The method of claim 1, And the control unit corrects the control pressure to a positive value according to the shock amount when the turbine change rate is greater than the set target change rate at the synchronization point of the target shift stage as the shift progresses. The method of claim 1, The control unit is a learning control device of an automatic transmission that corrects the control pressure (+) by the amount of time deviation when the turbine change rate is smaller than the set target change rate at the synchronization point of the target shift stage as the shift progresses. The method of claim 1, And the control unit corrects the control pressure to negative when the turbine change rate is greater than the set target change rate and the shift time is longer than the set target change time at the synchronization point of the target shift stage as the shift progresses. The method of claim 1, The control unit learning control device of the automatic transmission to correct the control pressure by the time deviation when the turbine change rate is less than the set target change rate at the synchronous point of the target shift stage, but the shift time is longer than the set target shift time as the shift progresses. . Extracting a target shift stage when a kick-down shift request is detected in a state where any shift stage is synchronized; Controlling the duty of the coupling element and the release element to shift to the target shift stage, and detecting a shift time from a shift start time to a shift completion time; Determining that a shift delay is not generated by comparing the detected shift time with a set target shift time; Detecting a turbine change rate at a synchronization point of the target speed change stage and comparing it with the target turbine change rate when a shift delay occurs; The control method of the automatic transmission comprising the step of correcting the control pressure supplied to the coupling element and the release element, and learning according to the comparison result. The method of claim 6, Correction of the control pressure according to the comparison result of the turbine change rate, A learning control method of an automatic transmission that corrects the control pressure to a positive value according to the shock amount when the turbine change rate is larger than the set target change rate. The method of claim 6, Correction of the control pressure according to the comparison result of the turbine change rate, A learning control method of an automatic transmission in which the turbine change rate is smaller than the set target change rate, but the shift time is fast, and the control pressure is corrected to a positive amount by the amount of time deviation. The method of claim 6, Correction of the control pressure according to the comparison result of the turbine change rate, A learning control method of an automatic transmission in which the control pressure is corrected to a negative value when the turbine change rate is larger than the set target change rate and the shift time is longer than the set target change time. The method of claim 6, Correction of the control pressure according to the comparison result of the turbine change rate, A learning control method of an automatic transmission in which the control pressure is corrected to a negative value by a time deviation when the turbine change rate is smaller than the set target change rate but the shift time is longer than the set target change time.

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