KR100191572B1 - Shift control method of auto-transmission - Google Patents

Abstract

The present invention relates to an automatic transmission, in which a basic duty pattern is formed, a value of a map table corresponding to the format is changed, and a duty pattern for fast shifting according to each gear position is provided, thereby outputting a duty control signal to a driving unit A method for obtaining a torque reduction request signal from a shift control device to an engine control device to reduce the output of the engine so as to reduce a shift shock that occurs during a shift progression and to improve a comfortable shift feeling through line pressure control, A step of receiving and reading a signal of sensing means output from the sensing means; Calculating a slip amount of the clutch based on an arithmetic expression by sensing the engine speed and the input speed of the transmission in the sensing unit and comparing the slip amount of the clutch with a set reference value; Determining whether there is a communication request signal from an external device; Setting an initial gear stage that matches the shift lever, throttle opening and vehicle speed, and setting engagement and disengagement of a lock-up clutch according to the running state; Determining whether the speed change stage is varied for a set time period as to whether or not the set initial speed change stage and the lockup clutch are engaged or disengaged; Setting an initial value to a next value, setting a hydraulic control solenoid valve to be operated according to a next gear position and a lockup related next value; Outputting a duty control signal of a variable speed hydraulic control solenoid valve and a lockup clutch control solenoid valve according to a set target speed change stage; Setting an operation state of an ON / OFF solenoid valve for supplying hydraulic pressure to elements operated according to a target speed change stage, determining whether a fault signal is generated in the sensing means and the solenoid valve and the control signal; Determining whether a required line pressure control request signal is output in accordance with the necessity of line pressure control; Outputting an operation signal of the ON / OFF solenoid valve to the actuator; And outputting a torque reduction request signal to the engine control unit in order to secure a shifting feeling during shifting of the automatic transmission.

Description

Method of controlling shift of automatic transmission

FIG. 1 is a block diagram of a shift control device of an automatic transmission according to an embodiment of the present invention,

2 (a) and 2 (b) are operational flowcharts of a shift control method for an automatic transmission according to an embodiment of the present invention.

More particularly, the present invention relates to an automatic transmission, and more particularly to an automatic transmission that determines a target gear position of an automatic transmission, forms a basic duty pattern for synchronizing a shift to a determined gear position, To a shift control method of an automatic transmission capable of achieving a duty pattern for each gear position.

Generally, as a power transmission means of a vehicle, a transmission can be classified into a manual transmission, a semi-automatic transmission, an automatic transmission, and a continuously variable transmission according to a shift mode.

Due to the development of automobile development technology, various power transmission devices are now being applied to automobiles in operation or production.

Therefore, an automatic transmission is the mainstream as a power unit designed to allow the driver to operate conveniently.

Here, the automatic transmission can be divided into a fully automatic transmission and a semi-automatic transmission depending on the degree of automatic transmission, and the fully automatic transmission can be classified as mechanical / hydraulic, electronic /

As a fully automatic transmission, a type in which a planetary gear unit is connected to a torque converter is the most widely used.

No matter how large the ratio of the torque ratio and the speed ratio of the fluid torque converter is, it is possible to make an ideal shift by connecting a separate transmission to the fluid torque converter.

This is because during operation of the vehicle, the engine is operated in the elastic region and the fluid torque converter must operate above the coupling point.

Therefore, conventionally, most of the automatic transmissions are configured as a four-speed shifting device, and the control procedure for controlling the hydraulic pressure for each gear position forms a different duty pattern for each gear position.

Therefore, in the course of development of the transmission, hydraulic pressure control is performed by forming the most appropriate duty pattern while performing trial and error, but most of the control is not performed.

However, the above-described conventional technique does not control the line pressure, so that the change of the torque and the rotation speed during the shift is not smooth, so that the ride feeling is lowered, and the load applied to the power transmitting element is also pulsating, .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems of the prior art by providing a basic duty pattern and changing the value of a map table suitable for the type of duty pattern, And to output a duty control signal to a driving unit (actuator) by providing a duty pattern in which a rapid shifting is performed step by step.

According to an aspect of the present invention,

A step of receiving and reading sensing signals outputted from the vehicle state sensing unit;

Calculating a slip amount of the clutch based on an arithmetic expression by sensing the engine speed and the input speed of the transmission in the sensing unit and comparing the slip amount of the clutch with a set reference value;

Determining whether there is a communication request signal from an external device;

Setting an initial gear stage corresponding to the shift lever, throttle opening and vehicle speed, and setting engagement and disengagement of a lock-up clutch according to the running state;

Determining whether the speed change stage has been changed for a predetermined time with respect to the engagement and disconnection of the set initial speed change stage and the lockup clutch;

Setting an initial value to a next value, setting a hydraulic control solenoid valve to be operated according to a next gear position and a lockup related next value;

Outputting a duty control signal of a variable speed hydraulic control solenoid valve and a lockup clutch control solenoid valve according to a set target speed change stage;

Setting an operation state of an ON / OFF solenoid valve for supplying hydraulic pressure to elements operated according to a target speed change stage, determining whether a fault signal is generated in the sensing means and the solenoid valve and the control signal;

Determining whether a required line pressure control request signal is output in accordance with the necessity of line pressure control;

Outputting an operation signal of the ON / OFF solenoid valve to the driving unit;

And outputting a torque reduction request signal to the engine control unit in order to secure a shifting feeling during shifting of the automatic transmission.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

Referring to FIG. 1, the structure of an automatic transmission control apparatus according to an embodiment of the present invention will be described.

A sensing unit (100) for sensing a variable state of the vehicle according to the driving state of the vehicle and outputting the corresponding electric signal so that a smooth shifting is performed;

A shift control unit 200 for outputting an engine torque reduction signal and a shift control signal so as to perform a smooth shift without causing a shift shock in a shift process of the automatic transmission, )Wow;

A drive unit 300 for rapidly and flexibly shifting in accordance with a shift control signal output from the shift control unit 200;

An engine control unit (400) for controlling an output of the engine in accordance with an engine torque reduction signal output from the shift control unit (200);

And an ignition plug 500 for outputting instantaneous high-voltage electricity according to a control signal output from the engine control unit 400.

In the above description,

Battery power sensing means 10 for sensing the voltage of the battery and outputting the sensed voltage as a basic energy for driving the vehicle;

The vehicle speed sensing means 11 includes a vehicle speed sensing means 11 for sensing the speed of the vehicle while driving and outputting a signal corresponding thereto as an electric signal;

A crank angle sensing means (12) for sensing the number of revolutions of the engine, the crank angle sensing means (12) varying the angle of the crank according to the operating state of the engine and outputting a corresponding signal as an electrical signal;

An input shaft sensing means (13) for sensing an input revolution speed at which a power output from the engine is input to a transmission and outputting the corresponding signal as an electrical signal in accordance with the revolution speed of the input shaft;

An oil temperature sensing means (14) for sensing the temperature of the oil for smooth operation of the transmission and outputting a corresponding signal as an electric signal;

A throttle position sensing means (15) coupled to the throttle shaft for rotating in conjunction with the throttle valve and sensing the opening of the throttle valve and outputting a corresponding signal;

A shift lever sensing means (16) for sensing the position of the speed change stage set by the driver and outputting the sensed position to a corresponding signal;

An overdrive switch 17 for detecting a selection in an overdrive mode (fifth speed) according to the driver's will according to the variable operation of the switch and outputting a variable signal;

An air conditioner switch 18 for outputting a signal for varying the operation of the air conditioner that adjusts the temperature of the vehicle interior according to the variable operation of the switch;

A mode selection switch 19 for outputting an economy signal that minimizes the fuel consumption rate according to the driver's choice and an electric signal that maximizes the output of the engine;

And an output rotation speed sensing means 20 for sensing the output rotation speed at which the power output from the input shaft of the transmission is input to the output shaft through the planetary gear and outputting the corresponding signal as an electric signal.

The operation of the automatic transmission control method according to the embodiment of the present invention is as follows.

When power is applied to drive the automobile, the transmission control unit 200 initializes all the parameters to be used (S100), and receives and reads the output signals of the sensing units 10 to 19 of the sensing unit 100 (S110 ).

The crank angle sensing means 12 senses the engine rotation speed of the sensing means of the sensing portion 100. The input shaft sensing means 13 senses the transmission input rotation speed and calculates the read signal by a predetermined arithmetic expression Thereby calculating the slip amount of the clutch (S120).

If the clutch slip amount is greater than the set reference value, it is determined that a failure has occurred in the automatic transmission, and the determination of pulldown is made (S131).

However, when the slip amount of the clutch is smaller than the set reference value, it is determined that the automatic transmission is normally operated.

Accordingly, when the pulp is determined, it is determined whether there is a communication request signal using a multi-user tester (S 140) as a method for determining whether the automatic transmission is malfunctioning for efficient maintenance at a workshop.

When the communication request signal is applied, the transmission control unit outputs the stored pulse signal, and the stored pulse signal is forcibly erased or self-erased (S141).

If there is no external communication request signal, an initial gear position matching the shift lever 16, the throttle opening 15, and the vehicle speed 11 is set (S150).

In addition, engagement and disengagement of the lock-up clutch according to the running state is set (S160).

In step S170, it is determined whether or not the speed change stage has been changed for a predetermined time with respect to the engagement and disconnection of the set initial speed change stage and the lockup clutch, and if the speed change stage is changed within the set time, the routine returns to the first speed change stage setting step S150 .

However, if the speed change stage is not changed during the set time, the initial value is set as the next value, and the hydraulic control solenoid valve to be operated according to the next gear position and the next value related to the lockup clutch set in S190.

In the above, the solenoid valve for hydraulic control includes a variable speed hydraulic control, a lockup clutch control and a line pressure control solenoid valve.

Accordingly, the next speed change stage selected by the hydraulic control solenoid valve set and operated as described above is set as the target speed change stage, and the duty control signal of the variable speed hydraulic control solenoid valve is output to the drive unit 300 in accordance with the target speed change stage S200).

When the duty value is determined according to the map table that has been set before the output of the duty control signal, the change in the value of the oil temperature sensing means 14 and the battery voltage 10 must be corrected.

The lockup-related next value set in step S190 is set as the target value, and the duty control signal of the solenoid valve for controlling the lockup clutch is outputted to the driver 300 according to the target value in step S210.

Here, when determining the duty value according to the map table that has been already set up before outputting the duty control signal as described above, it is necessary to correct the change in the value of the oil temperature sensing means 14 and the battery voltage 10.

The operation state of the ON / OFF solenoid valve used to set the oil passage in the valve body of the automatic transmission to supply the hydraulic pressure to the elements operated according to the target speed change stage set in (S200, S210) (S220).

Accordingly, it is determined whether a fault signal has been generated in the shift control unit 400, the solenoid valve and the control signal (S230). If a pulse signal is generated, the automatic transmission check lamp located in the driver's seat is turned on (S231).

However, if no pulse signal is generated in step S190, it is determined in step S190 whether a line pressure control request signal is applied according to the need for line pressure control in step S240. If a line pressure control request signal is supplied, In order to output the duty control signal to the driving unit 300 according to the value of the table, it is necessary to correct the change in the value of the battery voltage 10 at this time (S241).

When the line pressure control request signal is not output, the line pressure control duty signal is not output, and the operation signal of the ON / OFF solenoid valve and the duty control signal of the hydraulic control solenoid valve set at (S220) 300 (S250).

At this time, a torque reduction request signal is output to the engine control unit 400 in order to ensure a comfortable shifting feeling while the automatic transmission is shifting.

When the engine torque reduction signal is output from the transmission control unit 200, the engine control unit 400 decreases the high-voltage electrical output time of the spark plug 500 and delays the ignition timing by a predetermined time to reduce the engine output.

The present invention is not limited to the above embodiment, and can easily be invented from the above embodiments.

As described above, according to the embodiment of the present invention, a basic duty pattern is formed, a value of a map table suitable for the format is changed, and a duty pattern for fast shifting according to each gear position is provided, An automatic transmission control system having an effect of reducing a shift shock occurring during a shift operation by reducing the output of the engine and outputting an engine control torque signal to the engine control device in the shift control device and improving a pleasant shifting feeling through line pressure control Method can be provided.

Claims (8)

A step of receiving and reading a signal of sensing means output from the sensing unit; Detecting the engine speed and the transmission input speed by the sensing unit, calculating a slip amount of the clutch based on an arithmetic expression that is set, comparing the slip amount of the clutch with a set reference value, Setting an initial gear stage that matches the shift lever, throttle opening and vehicle speed, and setting engagement and disengagement of a lock-up clutch according to the running state; Determining whether the speed change stage is varied for a set time period as to whether or not the set initial speed change stage and the lockup clutch are engaged or disengaged; Setting an initial value to a next value if there is no change in speed change and setting a hydraulic control solenoid valve to be operated in accordance with a next speed change stage and a lockup related next value; Outputting a duty control signal of a variable speed hydraulic control solenoid valve and a lockup clutch control solenoid valve according to a set target speed change stage; Setting an operation state of an ON / OFF solenoid valve for supplying hydraulic pressure to elements operated according to a target speed change stage, determining whether a detection signal and a solenoid valve and a control signal have a pulse signal; Determining whether a required line pressure control request signal is output in accordance with the necessity of line pressure control; Outputting an operation signal of the ON / OFF solenoid valve to the driving unit; And outputting a torque reduction request signal to the engine control unit in order to secure a shift feeling during shifting of the automatic transmission. The automatic transmission according to claim 1, further comprising a step of compensating for a change in a current oil temperature and a battery voltage value when determining a duty value according to a map table that has been set before outputting the duty control signal to the driving unit Control method. The method according to claim 1, further comprising: determining whether a slip amount of the clutch calculated in the step (c) is smaller than a set reference value, determining that a failure has occurred in the automatic transmission if the clutch slip amount is greater than a preset reference value, ; And determining that the automatic transmission is normally operated when the slip amount of the clutch is smaller than the set reference value. The transmission control method according to claim 1, wherein when the clutch slip amount is larger than a predetermined reference, the shift control unit outputs a pulse signal stored in the transmission control unit when the communication request signal is applied, And returning after the communication is terminated. 2. The shift control method for an automatic transmission according to claim 1, further comprising: returning to an initial gear position setting step when a gear position is varied during a set time period as to whether or not the set initial gear position and lockup clutch are engaged or disengaged. The shift control method of an automatic transmission according to claim 1, further comprising the step of illuminating an automatic transmission check lamp when a detection signal, a solenoid valve, and a pulse signal are generated in a control signal. The hydraulic control apparatus according to claim 1, further comprising: a hydraulic control solenoid valve to be operated according to a set value of the next gear position set and a lockup clutch related set value, and requesting operation of the line pressure solenoid valve according to the necessity of line pressure control, And outputting a duty control signal to the driving unit in accordance with the value of the duty control signal. The shift control method of an automatic transmission according to claim 7, further comprising a step of correcting a change in a battery voltage value and an oil temperature sensing means before outputting a duty control signal.