KR100308944B1 - Method for controlling low oil temperature up-shift learning of automatic transmission - Google Patents

Abstract

PURPOSE: A method for controlling low oil temperature up-shift learning of an automatic transmission is provided to prevent the retardation of shifting by optimizing a normal oil temperature learning value and to improve the durability of a frictional element by securing prompt shift responsiveness. CONSTITUTION: A method for controlling low oil temperature up-shift learning of an automatic transmission comprises the steps of deciding the up-shift state of a vehicle(S100), setting up a duty to be outputted to a drive unit from a duty map stored in a memory depending on the value outputted from a travel state sensing unit(S110), reading a learning accumulated value stored in the duty map and sensing the temperature of oil(S120), comparing the temperature of oil to a reference value(S130), setting up a learning value contribution degree corresponding to a low oil temperature from the duty map(S140), and outputting a new output duty by operating the learning accumulated value and the learning contribution degree with an initial duty(S150).

Description

Learning Control Method for Low Oil Temperature Upshift Shift of Automatic Transmission

The present invention relates to a learning control method for low oil temperature upshift shifting of an automatic transmission. More specifically, the room temperature learning value for each temperature is calculated based on a value calculated by calculating a learning value learned at room temperature during upshift shifting. The present invention relates to a learning control method for low oil temperature upshift shifting of an automatic transmission for preventing a delay in low oil temperature by applying a duty value and a calculated value.

In general, the initial hydraulic pressure of the upshift, which influences the shift responsiveness, is applied at room temperature to set and store a map in the memory of the control means.

However, due to the characteristics of the oil of the automatic transmission, the shift responsiveness is greatly reduced at low oil temperatures, so by setting a duty correction map according to a separate temperature called a hydraulic correction value at low oil temperatures, the oil pressure is slightly increased at low oil temperatures to be expected at low oil temperatures. Being prepared for the problem of shift responsiveness.

However, in the automatic transmission, the initial duty is learned to improve the shifting feeling and shift response at room temperature (above 60 ° C). The learning value is changed to a positive value when the measured shift time is shorter than the set value, and changed to a negative value when the measured shift time is longer than the set value.

Therefore, in the related art, the learning value learned at room temperature at low oil temperature was changed to reflect the same even at low oil temperature.

When the above method is used, the conventional technology changes the characteristics of the automatic transmission at low oil temperature and the surface characteristics of the transmission friction material at low oil temperature as the shift is performed by reflecting the learning value learned at room temperature even at low oil temperature. Because of the change due to secular variation, the shift time becomes very long, and there is a problem that a shift shock occurs.

An object of the present invention is to optimize the initial duty to be corrected at low oil temperature in consideration of the friction material or deterioration characteristics of the automatic transmission or the reduction of engine torque based on the learning value learned at room temperature, and calculate and set the initial duty, After reading the accumulated value (Da) value learned and accumulated at room temperature, the memory map according to the oil temperature at low oil temperature is determined to determine the stored learning value contribution (K), and the new duty Du is calculated and output by the set arithmetic equation. It provides a learning control method for low oil temperature upshift shifting of the automatic transmission that has the effect of preventing shift delay, ensuring rapid shift response, and improving durability of friction materials by optimizing the oil temperature learning value to be corrected at low oil temperature. It is to.

According to an aspect of the present invention, there is provided a learning control method for shifting a low oil temperature upshift of an automatic transmission, the method comprising: determining whether a driving state of a vehicle is in an upshift shift; Setting a duty Du to be output to the driving means in a duty map stored in the memory according to a value output from the driving state detecting means of the vehicle when the driving state of the vehicle is in the upshift shifting; Reading the accumulated learning value Da storing the memory duty map by learning at room temperature according to the setting of the output duty Du, and detecting a state of the oil temperature of the vehicle currently driving; Determining whether the oil temperature is lower than a set reference value after detecting the oil temperature of the vehicle driving; Setting a learning value contribution (K) according to the low oil temperature stored in the memory duty map when the oil temperature of the vehicle driving is lower than a reference temperature; And calculating and outputting a new output duty Du by calculating the set values read above.

1 is a shift control pattern diagram during a low oil temperature upshift shift of an automatic transmission according to the prior art;

2 is a duty pattern diagram of low oil temperature up shift shift learning control of an automatic transmission according to an exemplary embodiment of the present invention.

Figure 3 is a block diagram of a learning control device at low oil temperature upshift shift of the automatic transmission according to an embodiment of the present invention.

Figure 4 is a flow chart of the learning control method during low oil temperature upshift shift of the automatic transmission according to an embodiment of the present invention.

Figure 5 is a graph showing the room temperature learning value contribution (K) at low oil temperature upshift shift of the automatic transmission according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a duty pattern diagram of low oil temperature up shift shift learning control of an automatic transmission according to an exemplary embodiment of the present invention. Referring to Figure 2, after the completion of learning at room temperature drop the automatic transmission to a low temperature shift 1 → 2 up to the shift by the conventional shift control, as shown in FIG. In the embodiment of the present invention, in the embodiment of the present invention, in addition to the learning value learned at room temperature, the optimum learning value for each temperature is added by setting the contribution rate of the room temperature learning value for each temperature. It can be seen that good shift response is ensured by shortening the shift time (about 1.8 sec).

3 is a block diagram illustrating a learning control device at low oil temperature upshift shift of an automatic transmission according to an exemplary embodiment of the present invention.

3, the configuration of the learning control device at the time of low oil temperature upshift shift of the automatic transmission according to an embodiment of the present invention,

A vehicle driving state detecting means (10) for receiving a signal outputted by varying the state of the vehicle according to the driving state of the vehicle and outputting a corresponding electric signal;

Initial duty to be corrected at low oil temperature in consideration of deterioration of friction material or induction characteristics of the automatic transmission or reduction of engine torque based on the learning value learned at room temperature by reading the signal output from the vehicle driving state sensing means 10. The initial duty is calculated and set, the accumulated value Da, which is learned and accumulated at room temperature, is read, and the learning value contribution K stored in the memory duty map according to the oil temperature at low oil temperature is determined. Control means 20 for calculating and outputting a new duty Du by an arithmetic expression;

According to the duty control signal learned and output from the control means 20 is composed of a drive means 30 for performing a stable shift even in the low oil temperature upshift shift.

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

A throttle valve opening degree detection unit 11 for detecting an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of the accelerator pedal and outputting a corresponding signal;

A vehicle speed detector 12 which detects 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 oil temperature detection unit 16 detects the temperature of the automatic transmission oil that varies according to the driving state of the vehicle and outputs a corresponding electric signal.

4 is a flowchart illustrating a learning control method during low oil temperature upshift shifting of an automatic transmission according to an exemplary embodiment of the present invention. 5 is a graph showing the room temperature learning value contribution (K) during the low oil temperature upshift shift of the automatic transmission according to an embodiment of the present invention.

With reference to Figures 2 to 5 attached to the control method of the learning control device at low oil temperature upshift shift of the automatic transmission made by the above configuration will be described in detail.

For example, in a vehicle equipped with an automatic transmission, when the shift stage is shifting 1 → 2 upshift, the control means 20 determines whether the driving state of the vehicle is in the upshift shift (S100).

When the driving state of the vehicle is shifting from 1 to 2 upshifts, the control means 20 outputs a duty Du to be output to the driving means 30 according to the value output from the driving state sensing means 10 of the vehicle. It is set from the duty map stored in the memory (S100).

As the duty Du to be outputted is set, the control means 20 reads the learning accumulation value Da, which is learned at room temperature of the oil temperature and stored in the memory duty map, and detects the state of the oil temperature of the vehicle currently being driven ( S120).

The control means 20 for detecting the oil temperature of the vehicle driving in the above determines whether the oil temperature is lower than the set reference value 60 ℃ (S130).

When the oil temperature of the vehicle being driven is lower than the set reference temperature of 60 ° C., the control means 20 reads the learning value contribution K according to the low oil temperature stored in the memory duty map as shown in FIG. 5. It is set in the memory duty map (S140).

Therefore, the control means 20 calculates and calculates the learning accumulation value Da stored at learning at room temperature and the low learning temperature contribution contribution K set at step S140 by the set arithmetic expression. In operation S150, a new output duty Du is calculated by calculating an initial duty Du set according to the vehicle driving state in step S110.

Du = Duo + (Da × K)

(In the above, Duo is the initial duty set according to the vehicle driving state.

Da is the cumulative learning stored at learning at room temperature,

K is the contribution of learning value according to low oil temperature

to be.)

That is, in the case where the learning value learned at room temperature is a positive value, the new duty is calculated by adding a smaller value than the learning value at room temperature at low oil temperature, and the learning value learned at room temperature is negative (-). In the case of a value of, a new duty value is calculated by subtracting a value larger than the learning value at room temperature at low oil temperature.

However, when the learning value learned at room temperature is negative (-), even if the learning value at room temperature is applied as it is, the durability of the friction material has no reason to deteriorate compared to the existing control means 20, so that the control means 20 is unnecessary. To avoid wasting memory due to the duty cycle setting, the existing controls remain unchanged.

Therefore, the learning value to be corrected at low oil temperature by introducing the learning value contribution (K) duty map shown in FIG. Can be set to optimize.

Therefore, the control means 20 can output the new duty Du calculated above to the driving means 30 to perform a stable shift.

However, when the oil temperature of the automatic transmission sensed in S130 is greater than the set reference temperature of 60 ° C., the control means 20 learns and stores the learning accumulated value Da at the time of the oil temperature read in S120. In operation S110, an initial duty Du set by the vehicle driving state is calculated, and a new output duty Du is calculated to be output to the driving means 30 in operation S131.

Du = Duo + Da

(In the above, Duo is the initial duty set according to the vehicle driving state.

Da is the cumulative value of the learning stored at room temperature

to be.)

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, the initial duty is calculated to optimize the initial duty to be corrected at low oil temperature in consideration of the deterioration of friction material and indentation characteristics of the automatic transmission or reduction of engine torque based on the learning value learned at room temperature. The accumulated value Da, which is learned and accumulated at room temperature, is read, and the learning value contribution K stored in the memory duty map according to the oil temperature at low oil temperature is determined to determine the new duty Du by the arithmetic formula set. By calculating and outputting, the low oil temperature upshift of the automatic transmission has the effect of preventing shift delay, ensuring fast shift response, and improving durability of friction materials by optimizing the coolant temperature learning value to be corrected at low oil temperature. Learning control method can be provided.

Claims (6)

In the low oil temperature upshift shift learning control method of the automatic transmission, Determining whether the driving state of the vehicle is upshifting; Setting a duty Du to be output to the driving means in a duty map stored in the memory according to a value output from the driving state detecting means of the vehicle when the driving state of the vehicle is in the upshift shifting; Reading the accumulated learning value Da stored in the memory duty map by learning at room temperature according to the setting of the output duty Du and detecting a state of the oil temperature of the vehicle currently driving; Determining whether the oil temperature is lower than a set reference value after detecting the oil temperature of the vehicle driving; Setting the learning value contribution (K) according to the low oil temperature stored in the memory duty map in the memory duty map when the oil temperature of the vehicle driving is lower than a preset reference temperature; And calculating and outputting a new output duty (Du) by calculating the set values read out as described above. The method of claim 1, wherein the method for calculating a new duty is calculated by calculating a learning accumulation value Da stored at room temperature learning and learning contribution at low temperature using a set arithmetic expression, and calculating the calculated value. And calculating a new output duty (Du) by calculating an initial duty (Duo) set according to the driving state of the vehicle. {Du = Duo + (Da × K) (In the above, Duo is the initial duty set according to the vehicle driving state. Da is the cumulative learning stored at learning at room temperature, K is the contribution of learning value according to low oil temperature to be.) } According to claim 1, If the learning value learned at room temperature is a positive value, the new duty is calculated by adding a smaller value than the learning value at room temperature at low oil temperature, and the learned value at room temperature is negative ( And a value of-), and calculating a new duty value by subtracting a value greater than the learning value at room temperature at low oil temperature, and calculating a new duty value. According to claim 3, If the learning value learned at room temperature is negative (-) learning control at low oil temperature upshift shifting of the automatic transmission, characterized in that it comprises the step of applying as it is without changing the existing control. Way. The method of claim 1, wherein the learning value to be corrected at low oil temperature is optimized according to the temperature by introducing a learning value contribution (K) duty map when the learning value learned at room temperature converges to a positive value. Learning control method when the low oil temperature upshift shift of the automatic transmission, characterized in that it comprises a step. According to claim 1, If the oil temperature of the automatic transmission detected according to the driving state of the vehicle is greater than the set reference temperature, the learning accumulation value Da and the initial duty (Duo) set according to the driving state of the vehicle at room temperature Computing a new output duty (Du) to calculate and output a low oil temperature upshift learning control method of an automatic transmission characterized in that it comprises. {Du = Duo + Da (In the above, Duo is the initial duty set according to the vehicle driving state. Da is the cumulative value of the learning stored at room temperature to be.) }

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