KR100308999B1 - Method for controlling automatic transmission - Google Patents

Abstract

PURPOSE: A total control method of an automatic transmission is provided to improve shift quality, to reduce shift shock, and to increase the durability by entirely controlling with detecting torque reduction starting points according to shift condition. CONSTITUTION: A total control system of an automatic transmission is composed of a travel state detecting unit(10) outputting electrical signals by detecting signals according to traveling state; a TCU(Transmission Control Unit)(20) outputting a duty control signal shifting to the target speed range according to condition in power-on upshifting or power-on downshifting, and a total control request signal by detecting different total control request points; an ECU(Electronic Control Unit)(30) outputting an engine control signal to reduce engine output according to the total control request signal; and a driving unit(40) shifting without shift shock according to signals from the TCU and the ECU. Shift shock is reduced, and shift quality is improved with entirely controlling the automatic transmission.

Description

Total control method of automatic transmission

The present invention relates to a total control method of an automatic transmission, and more particularly, a manufacturing company uses a smooth total control when shifting between different engine control devices (hereinafter referred to as ECUs) and shift control devices (hereinafter referred to as TCUs). A total control method of an automatic transmission for reducing shift shock.

In general, the total control refers to the engine output according to the engine reduction request signal output from the TCU during shifting to prevent engagement shock during power-up shift shifting or power-off shift shifting in a vehicle equipped with an automatic transmission. To reduce the.

Therefore, in the related art, a manufacturer performs a smooth shift without shift shock during power on up shift and power on down shift shift using a TCU controlling an identical automatic transmission and an ECU controlling an engine.

However, in the above-described conventional technology, when the TCU and the ECU makers use different products, the data output method is different, so that the smooth data communication is not performed. Therefore, the engine output during power on up shift and power on down shift shifting. Even if the total control signal for the reduction is output, there is a problem that a shift shock occurs.

The present invention has been made to solve the above problems, and an object of the present invention is to determine different torque reduction request starting points according to the shift conditions if the total control condition is satisfied when shifting the power on up shift or the power on down shift shift. By performing a total control to provide a total control method of an automatic transmission for performing a shift without a shift shock.

1 is a block diagram of a device to which a total control method of an automatic transmission according to the present invention is applied.

Figure 2 is a flow chart of the operation of the total control method of the automatic transmission according to the present invention.

3 is a graph showing the total control operation during power-up upshift of the automatic transmission.

4 is a graph showing a total control operation during power on and down shift of an automatic transmission.

The total control method of the automatic transmission of the present invention for achieving the above object is that, in the automatic transmission vehicle using a different control device manufactured by the manufacturer, the opening amount Th of the throttle valve is equal to or greater than a predetermined reference value. Small, the vehicle speed (No) is greater than the predetermined reference value, the oil temperature is greater than or equal to the predetermined reference value, or greater than the predetermined reference value set after the activation, the battery voltage The predetermined reference value is greater than or equal to the predetermined reference value, and the power-up shift shift total control condition is satisfied, or the opening amount Th of the throttle valve is greater than or equal to the predetermined reference value, and the vehicle speed No is set to the predetermined reference value. Greater than, the oil temperature is greater than or equal to the predetermined reference value, or greater than the predetermined reference value set after the ignition on. If the battery voltage is greater than or equal to the predetermined reference value for more than a predetermined reference time, the total control condition for power-on-down shifting or the total control condition for power-on-down shifting is satisfied. Determining a start point of another engine torque reduction request and performing total control; And ending the total control when the engine torque reduction end point or the predetermined engine torque reduction time elapses.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a total control apparatus of an automatic transmission to which a total control method of an automatic transmission according to the present invention is applied is configured to output a predetermined electric signal by detecting a signal that is varied and output according to a driving state of a vehicle. By shifting the vehicle driving state detecting means 10 and a predetermined electric signal output from the driving state detecting means 10 to the target shift stage according to the shift stage shifting condition when the power on up shift or the power on down shift is applied. The output of the engine is reduced according to the duty control signal for the control unit, a TCU 20 that determines a different total control request start point and outputs a predetermined total control request signal, and a total control request signal output from the TCU 20. ECU 30 for outputting a predetermined engine control signal, and drive means 40 for shifting without shift shock in accordance with control signals output from the TCU 20 and ECU 30. Consists of

In particular, the vehicle driving state detection means 10, the throttle valve opening degree detection unit 11 for detecting the degree of opening of the throttle valve whose opening and closing state is variable in conjunction with the operation state of the accelerator pedal and outputs a predetermined signal; The vehicle speed sensor 12 detects the rotational speed of the output shaft of the vehicle and outputs a predetermined signal corresponding to the traveling speed of the vehicle, and detects the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission. An output turbine shaft speed detection unit 13, an engine speed detection unit 14 for detecting a rotation speed of the crankshaft variable according to the operating state of the engine and outputting a predetermined signal, and variable according to the vehicle running state The oil temperature detector 15 detects the temperature of the automatic transmission oil and outputs a predetermined electric signal, and detects the battery voltage of the vehicle and outputs a predetermined electric signal. It is configured to include the re-voltage detecting unit (16).

In addition, the driving means 40 is a duty control according to the duty control signal output from the TCU 20 to the first drive unit 41 for shifting the gear shift stage to the target gear shift stage, and the engine output output from the ECU 30. It consists of the 2nd drive part 42 which controls fuel injection quantity according to a reduction signal.

The total control method of the automatic transmission will be described based on the total control device of the automatic transmission.

As shown in FIG. 2, first, when the TCU 20 satisfies the shift condition as the driver drives the vehicle, it is determined whether the shift condition is the power-on up shift shift condition (S100 and S110).

When the shift condition determined according to the driver's vehicle driving state is determined as the power-on-up shift shift condition, the TCU 20 sets the target shift stage by the shift pattern stored in the memory, and the shift set above. However, the predetermined duty control signal for performing the power on up shift shift is output to the first driver 41 of the driving means 40 (S120).

Therefore, the first driving part 41 of the driving means 40 is duty-controlled by the duty control signal output from the TCU 20 to form oil pressure at a predetermined gear stage corresponding to the oil supplied from the automatic transmission oil pump. Print it out.

In addition, the TCU 20 determines whether the total control condition is satisfied before outputting the total control signal for performing the power-on-up shift shifting to the ECU 30 without shift shock to the target shift stage (S130).

In the above, the total control condition is 45 degrees Celsius, the opening degree Th of the throttle valve is equal to or smaller than 90% of the predetermined reference value, the vehicle speed No is higher than 1500 rpm of the predetermined reference value, and the oil temperature is the predetermined reference value. If it is greater than or equal to or greater than 1480 rpm, which is a predetermined reference value set after ignition, and continues for 10 minutes or more, and the battery voltage is greater than or equal to 10 V, which is a predetermined reference value, it is determined that the total control requirement is satisfied.

Subsequently, the TCU 20 determines whether the shift stage actually starts shifting to the target shift stage (S.B) (S140).

If it is determined that the shift stage has actually started shifting to the target shift stage in this step, the TCU 20 determines a starting point for outputting the engine torque reduction request signal to the ECU 30, as shown in FIG. The ECU 30 outputs an engine torque reduction request signal at step S150.

On the other hand, if it is determined in step 140 that the shift stage does not actually start shifting to the target shift stage, the process is performed again from step 120.

The total control operating conditions are as shown in Table 1 below.

[Figure 1]

In addition, the starting point of the engine torque reduction request can be determined by the rotation speed Nt of the turbine and the turbine rotation change rate.

Therefore, as a method of determining the starting point of the engine torque reduction demand by the turbine rotation speed Nt, when the turbine rotational speed reaches the feedback starting point in each shift, it is determined as the starting point of the engine torque reduction request, and the turbine rotational change rate ( As a method of determining the starting point of the engine torque reduction request by dNt),

1) 2 → up shift

After the kick-down switch off point,

After detecting dNt > XNtDTA (12 rpm / cyc),

When the state of dNt <XNtDTB (6 rpm / cyc) is detected three times in succession

2) 2 → 3 up shift

At the time when 260 ms, a predetermined time elapses from the shift start signal output point S.S,

After detecting dNt &gt; XNtDTC (4 rpm / cyc),

When the state of dNt <XNtDTD (2 rpm / cyc) is detected three times in succession

3) At 3 → 4 upshift shifting, the starting point for requesting engine torque reduction based on the turbine change rate (dNt) is not determined.

However, the determination of the start point of the engine torque reduction request by the turbine change rate dNt is applied only when all of the following conditions are satisfied before the start of the feed back F.B.

1) At the first turbine change rate dNt determination point, the throttle opening degree Th is 60% or more, which is a predetermined value, and the difference between the normal shift point speed (No) and the actual vehicle speed (No) on the shift pattern is a set range ( 210 rpm to 350 rpm).

2) After the first turbine change rate (dNt) determination point, the throttle opening degree (Th) shall not be lowered by more than the set reference value of 1.96%.

Therefore, the TCU 20 outputs an engine output reduction request signal to the ECU 30 when all of the above conditions are satisfied, and performs feedback control (S160).

The ECU 30 outputs a predetermined control signal to the second drive unit 42 of the driving means 40 according to the engine output reduction request signal output from the TCU 20.

Therefore, the injector, which is the second drive part 42 of the drive means 40, reduces the amount of fuel injected into the engine cylinder (not shown in the figure).

In addition, the TCU 20 calculates a target shift time according to Equation 1 below, calculates a change rate dNt of the target turbine, and then determines whether the shift stage is shifted to the target shift stage (S170, S180, and so on). S190).

[Equation 1]

to = (c × No + d) × K (ms)

(In the above to the target shift time,

No is the vehicle speed,

K is the map value for the throttle opening degree (Th),

The c and d values are the same as in normal feedback control.

The reason for calculating the target shift time is to learn the initial engagement duty ratio using the shift value correction value when torque reduction is normally executed. The target shift time used for the learning control is one learning condition after the end of the feedback. Applies only if this is satisfied.

If it is determined in the step that the transmission is completed as the target shift stage, the TCU 20 determines the engine torque reduction request end point RF and outputs an engine torque reduction request signal to the ECU 30, and After the time elapses, the power-on-up shift control is terminated (S200).

On the other hand, in step 190, if the shift stage is not determined that the transmission is completed to the target shift stage, it is performed again from the step 160.

The determination of the end point RF of the engine torque reduction request above is performed when the difference? N of the actual turbine speed Nt with respect to the turbine speed Nt of the target shift stage becomes less than or equal to the value set in Table 2 below. It can be determined from.

[Table 2]

However, if the shift condition determined according to the driving state of the driver in step 110 is not a power on up shift shift condition, the TCU 20 determines that the shift condition determined according to the driving state of the driver is a power on down shift shift. It is determined whether the condition (S300).

When the shift condition determined according to the driving state of the driver in the step is determined to be the power on down shift shift condition, the TCU 20 sets the target shift stage by the shift pattern stored in the memory and is set as described above. A predetermined duty control signal for performing the power on-down shift shifting to the shift stage is output to the first driver 41 of the driving means 40 (S310).

Therefore, the first driving part 41 of the driving means 40 is duty-controlled by the duty control signal output from the TCU 20 to form oil pressure at a predetermined gear stage corresponding to the oil supplied from the automatic transmission oil pump. Print it out.

In addition, the TCU 20 determines whether the total control condition is satisfied before outputting the total control signal for performing the power-on-up shift shifting to the ECU 30 without shift shock to the target shift stage (S320).

In this step, the total control condition is greater than or equal to 24%, which is a predetermined reference value, and the opening amount Th of the throttle valve is greater than or equal to 1500 rpm, which is a predetermined reference value, and the oil temperature is set to 45, which is a predetermined reference value. It is determined that the total control requirement is satisfied if the battery voltage is greater than or equal to 0 ° C. or greater than 1480 rpm, which is set after the ignition on, and is greater than or equal to 10 V, and the battery voltage is greater than or equal to 10 V, which is the predetermined reference value.

Subsequently, the TCU 20 determines whether the shift stage actually starts shifting to the target shift stage (S.B) (S330).

If it is determined that the shift stage has actually started shifting to the target shift stage in this step, the TCU 20 performs a feedback control, detects the rate of change of the turbine, and determines whether the shift stage has been completed to the target shift stage. (S340, 350).

If it is determined in step 330 that the shift stage does not actually start shifting to the target shift stage, the step 310 is performed again.

In the above step, when the shift stage is completed as the target shift stage, the TCU 20 determines the starting point RS for outputting the engine torque reduction request signal to the ECU 30, as shown in FIG. The ECU 30 outputs a predetermined engine torque reduction request signal (S360).

On the other hand, in step 350, if it is determined that the transmission is not completed to the target gear, the step 340 is performed again.

The determination of the starting point of the engine torque reduction request RS is performed in such a manner that the difference ΔN of the actual turbine speed Nt with respect to the turbine speed Nt of the target speed change stage is equal to or less than the value set in Table 3 below. Judgment can be made at this point.

Therefore, the ECU 30 outputs a predetermined control signal to the second drive unit 42 of the driving means 40 according to the engine output reduction request signal output from the TCU 20.

And the injector which is the 2nd drive part 42 of the drive means 40 reduces the amount of fuel injected into an engine cylinder (not shown in figure).

In addition, the TCU 20 outputs the engine torque reduction request signal to the ECU 30 and then determines whether the engine torque reduction request time t has passed a predetermined reference time to (S370, S380).

When the engine torque reduction request signal is output to the ECU 30 in the above step and the engine torque reduction request time t has passed the predetermined reference time (to), the TCU 20 outputs the engine torque reduction request release signal. It outputs to ECU30 (S390).

[Chart 3]

※ The above data values are obtained through experiments.

On the other hand, if the engine torque reduction request time t has not passed the predetermined reference time to, the step 370 is performed again.

On the other hand, in steps 130, 300 and 320, when each condition is not satisfied, the process returns to the main routine.

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 total control condition is satisfied when shifting the power on up shift or the power on down shift, the total torque control is performed by determining different torque reduction request starting points according to the shift condition, thereby shifting without shift shock. It can be performed to improve the feeling of shift, there is an effect that can improve the durability.

Claims (11)

Manufacturers use different controls to control automatic transmission vehicles, The opening amount Th of the throttle valve is equal to or smaller than the predetermined reference value, the vehicle speed No is greater than the predetermined reference value, the oil temperature is greater than or equal to the predetermined reference value, or is greater than the predetermined reference value set after ignition on. If the battery condition is greater than or equal to the predetermined reference value in a large state and continues for a predetermined reference time, the power-up shift transmission total control condition is satisfied, or The opening degree Th of the throttle valve is greater than or equal to the predetermined reference value, the vehicle speed No is greater than the predetermined reference value, and the oil temperature is greater than or equal to the predetermined reference value, or set after the ignition is turned on. If the battery voltage is greater than or equal to a predetermined reference value and the battery voltage is greater than or equal to a predetermined reference value, the total control condition for power-on down shifting or the total control condition for power-up shifting or power-on-down shifting is determined. If it satisfies the step of determining the different engine torque reduction request start point in accordance with the shift condition to perform a total control; And ending the total control when the engine torque reduction end point or the predetermined engine torque reduction time has elapsed. The method according to claim 1, Total control is the total control method of the automatic transmission to perform the total control when the operating conditions shown in Table 1 below. [Figure 1]

The method according to claim 1, The method of determining the starting point of the engine torque reduction request at the time of power-on shift shifting is the total control method of the automatic transmission including the thing which can be determined by the rotation speed (Nt) of a turbine, and a turbine rotation change rate. The method according to claim 3, The method for determining an engine torque reduction request start point by the turbine rotation speed Nt includes determining that the engine torque reduction request start point is reached when the turbine rotation speed reaches the feed back start point at each shift. Total control method. The method according to claim 3, The method for determining the starting point of the engine torque reduction request based on the turbine rotation rate of change dNt is 1 → 2 up shift After the kick-down switch off point, after detecting dNt &gt; XNtDTA, and then detecting the state of dNt &lt; XNtDTB continuously for a predetermined number of times; 2 → 3 up shift When a predetermined time has elapsed from the shift start signal output point S.S. after detecting dNt &gt; XNtDTC, the condition of dNt &lt; XNtDTD (2 rpm / cyc) is continuously detected for a predetermined number of times; 3 → 4 up shift A total control method for an automatic transmission, comprising not determining an engine torque reduction request start point based on a turbine change rate dNt. The method according to claim 5, The engine torque reduction request start point determination based on the turbine change rate (dNt) is applied only when all of the following conditions 1 are satisfied before the start of the feed back (F.B). [Condition 1] 1) At the first turbine change rate dNt determination point, the throttle opening degree Th is equal to or greater than a predetermined value, and the difference between the normal shift point vehicle speed No and the actual vehicle speed No on the shift pattern is included in the setting range. do. 2) After the first turbine change rate (dNt) determination point, the throttle opening degree (Th) shall not fall below the set reference value. The method according to claim 1, A total control method for an automatic transmission, comprising learning an initial engagement duty ratio using a shift time correction value calculated by Equation 1 below when the engine torque reduction is normally performed during power-on shift shifting. [Equation 1] to = (c × No + d) × K (ms) (In the above to the target shift time, No is the vehicle speed, K is the map value for the throttle opening degree (Th), c and d values are the same as in normal feedback control.) The method according to claim 7, The total speed control method of the automatic transmission made by including the target shift time used for the learning control is calculated only after the learning condition is satisfied after the end of the feedback. The method according to claim 1, In the method of determining the engine torque reduction request end point RF at the time of power-on shift shifting, the difference ΔN of the actual turbine speed Nt with respect to the turbine speed Nt of the target shift stage is shown in Table 2 below. A total control method for an automatic transmission comprising determining at a time when the value becomes less than a set value. [Table 2]

The method according to claim 4, The engine torque reduction request start point (RS) determination method at the time of power-on downshift shifting is set in Table 3 below in which the difference (ΔN) of the actual turbine speed (Nt) with respect to the turbine speed (Nt) at the target speed change stage is set. A total control method for an automatic transmission, comprising determining at a time when the value is less than or equal to a value. [Chart 3]

The method according to claim 4, The sum of the automatic transmissions that output the engine torque reduction request cancel signal to the ECU when the engine torque reduction request time t during the power-on down shift is warned of the predetermined engine torque reduction request release reference time (to) set for each shift stage. Control method.

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