KR101880560B1 - Method and apparatus for learning torque capaity of clutch of vehicle - Google Patents

Abstract

The present invention discloses a vehicle clutch torque capacity learning method and apparatus. According to the present invention, when the vehicle behavior is stabilized, when the slip accumulation value for the slip amount received in a predetermined period during the slight slip control of the clutch is equal to or greater than a predetermined determination reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the threshold value, Learning is performed on the derived torque capacity to update the learning value for the torque capacity and stored, and the stored torque capacity learning value is corrected to the correction torque reflecting the oil temperature fluctuation Clutch oil pressure control, it is possible to actively learn the torque capacity against the error of the input torque and the oil temperature, and to derive the accurate torque capacity, so that the return spring repulsion pressure, the clutch deterioration, and the torque capacity Due to the excessive slip of the clutch during running caused by incorrect control of It is possible to fundamentally eliminate a reduction in ride comfort and a decrease in the transmission feeling.

Description

Technical Field [0001] The present invention relates to a torque capacity learning method and apparatus for a vehicle clutch,

The present invention relates to a torque capacity learning method and apparatus for a vehicle clutch, and more particularly, to a torque capacity learning method and apparatus for a vehicle clutch that calculates a transmission torque capacity varying according to a deteriorated return spring of a clutch or a characteristic change of a piston, To a method and an apparatus for updating learning values for torque capacity.

The hybrid vehicle means to drive the vehicle by efficiently combining two or more kinds of power sources. In most cases, the hybrid vehicle is driven by an engine that obtains the rotational force by burning fuel (fossil fuel such as gasoline) and an electric motor Means a vehicle driven by a vehicle.

These hybrid vehicles are future vehicles that can reduce exhaust gas and improve fuel efficiency by adopting not only the engine but also the electric motor as the auxiliary power source. In response to the demand for the improvement of fuel efficiency and environment-friendly products, .

Generally, a hybrid vehicle can reduce exhaust gas and improve fuel economy by using a motor as a power source as well as an engine. Such a hybrid vehicle may be arranged in a line with an engine, a drive motor, and a transmission.

Such a hybrid vehicle may be equipped with a clutch for transmitting and interrupting the driving force between the engine and the driving motor. The engine 11 may be equipped with an ISG (Integrated Startor & Generator) that operates the engine or acts as a generator.

The hybrid vehicle may be driven in an EV (Electric Vehicle) mode, which is a pure electric vehicle mode using only the power of the driving motor. In addition, the hybrid vehicle is a hybrid vehicle in which the driving force of the driving motor 12 The hybrid vehicle can recover the braking and inertial energy of the vehicle during power generation by braking or inertia of the vehicle through power generation from the motor and outputting it to the battery The vehicle can be driven in a regenerative braking (RB) mode for charging.

In this manner, the hybrid vehicle operates the clutch for power transmission and separation between the drive motor and the engine for mode conversion and the like. The operating oil pressure of the clutch, which determines the operation of the clutch, can greatly affect the operability and the power performance of the hybrid vehicle, and therefore must be accurately controlled.

The logic for accurately calculating the torque capacity, which is the clutch transmission torque, for precise control of the operating oil pressure of such a clutch is a very important algorithm.

This torque capacity is derived from a clutch transmission torque calculation equation established based on a clutch torque-to-clutch torque ratio map or a pressure-to-friction coefficient map, and such a clutch torque torque calculation formula is already well known.

However, there has been a problem that it is difficult to derive the accurate torque capacity when the deterioration of the clutch, the repulsive pressure of the return spring, or the characteristics of the piston is changed, based on the clutch transmission torque calculation formula.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a clutch control device and a clutch control device that are capable of detecting a stable vehicle behavior based on an amount of change of an acceleration signal and an input torque change amount, The clutch pressure and the clutch input torque ratio are derived as the torque capacity when the slip accumulation value with respect to the slip amount received in a predetermined cycle at the time of fine slip control of the clutch is equal to or greater than a predetermined reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the threshold value And learning is performed on the derived torque capacity to update the learning value for the torque capacity so as to actively learn the torque capacity against the error of the input torque to derive the accurate torque capacity. And to provide a learning method and apparatus.

According to an aspect of the present invention, there is provided an apparatus for learning clutch torque capacity for a vehicle,

A clutch for transmitting the power of the vehicle to the transmission;

When it is determined that the vehicle behavior is stabilized based on the change amount of the acceleration signal and the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque, the slip accumulation value for the slip amount received at the predetermined period in the fine slip control of the clutch A clutch torque capacity deriving part for deriving a clutch torque capacity at a time when the integrated value of the calculated slip accumulation value is equal to or greater than a preset reference value and is equal to or greater than a preset threshold value;

A clutch torque capacity learning unit that performs learning on the derived clutch torque capacity and updates a learning value for the torque capacity with respect to an error and an acceleration signal variation amount of the input torque received at a predetermined time point of a predetermined cycle; And

And a clutch hydraulic pressure drive unit that performs hydraulic pressure control according to the hydraulic pressure control signal set based on the clutch torque capacity learning value and transmits the hydraulic pressure control signal to the clutch.

In another aspect of the present invention, there is provided a vehicle clutch torque capacity learning method for a vehicle,

A vehicle behavior determining process that determines that the vehicle behavior is stable based on the variation amount of the acceleration signal and the input torque variation amount of the clutch, the vehicle speed variation amount, and the absolute value of the clutch input torque;

When the slip accumulation value for the slip amount received in a predetermined cycle at the time of fine slip control of the clutch is stable or stable and the slip accumulation value is equal to or greater than a predetermined reference value and the integral value of the calculated slip accumulation value is equal to or greater than the threshold value, A torque capacity deriving process of deriving the torque capacity based on the pressure; And

A torque capacity derived before a predetermined time point of a predetermined cycle, a clutch input torque input at a predetermined time point of a predetermined cycle, and a preset maximum torque and minimum torque, And a torque capacity learning process for updating the torque capacity learning value and storing the updated torque capacity learning value.

Preferably, the torque capacity learning process includes:

An input torque difference calculation step of receiving an input torque received at a predetermined time point of a predetermined cycle to calculate an input torque difference;

A torque capacity learning value derivation step of deriving a current torque capacity learning value from the input torque difference and a predetermined proportional relation based on the torque capacity and the acceleration signal variation amount before the predetermined time of the predetermined period;

A torque capacity deriving step of deriving a torque capacity having a larger value among a torque capacity having a smaller value among the current torque capacity learning value and a preset maximum torque and a preset lowest torque; And

And a torque capacity updating step of updating the derived torque capacity to a torque capacity learning value when the derived torque capacity is within the maximum torque and the lowest torque range, and storing the updated torque capacity.

Preferably, the torque capacity updating step includes:

The control unit may correct the stored torque capacity learning value to a predetermined correction torque according to the oil temperature fluctuation, generate a hydraulic pressure control signal based on the corrected torque capacity learning value, and transmit the generated hydraulic pressure control signal to the clutch hydraulic pressure control unit.

As described above, the vehicular clutch torque capacity learning method and apparatus according to the embodiment of the present invention are capable of stabilizing the vehicle behavior based on the change amount of the acceleration signal, the input torque change amount of the clutch, the vehicle speed change amount, The clutch input pressure and the clutch input torque ratio are set to be equal to or greater than the threshold value when the slip accumulation value with respect to the slip amount received in a predetermined period during the slight slip control of the clutch is equal to or greater than a predetermined determination reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the threshold value Learning is performed on the torque capacity derived for the input torque error and the acceleration signal variation to update the learning value for the torque capacity so that the learning on the torque capacity is actively performed on the error of the input torque Accurate torque capacity can be derived, and the return spring repulsion pressure, Reochi becomes deteriorated, and can change the characteristics of the piston is essentially removed by the reflected torque capacity of the driving comfort and decrease degradation due to byeonsokgam excessive slip of driving due to an incorrect control of the clutch occurs.

Further, by correcting the clutch torque capacity learning value to the correction torque reflected in the fluctuation in the oil temperature, the accurate torque capacity can be derived by learning about the torque capacity actively with respect to the fluctuation in the oil temperature and the return spring repulsion pressure, clutch deterioration, It is possible to fundamentally eliminate a ride comfort deterioration and a reduction in shift feeling due to an excessive slip of the clutch during running due to an incorrect control of the torque capacity, which is reflected in the characteristic change of the piston.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
1 is a diagram showing a configuration of a clutch torque capacity learning device for a hybrid vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a process of learning a clutch torque capacity of a hybrid vehicle according to another embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Before describing the present invention, the embodiment of the present invention describes a clutch applied with a hybrid vehicle as an example, but the clutch is applicable to all vehicles on which a clutch is mounted, such as a vehicle equipped with a continuously variable transmission and a vehicle equipped with a dual clutch I will make it clear that it is possible.

1 is a diagram showing a configuration of a clutch torque capacity learning device for a hybrid vehicle according to an embodiment of the present invention. 1, an apparatus for learning clutch torque capacity of a hybrid vehicle according to an embodiment of the present invention includes a slip amount accumulation value derived through fine slip control of a clutch hydraulic pressure when the behavior of the vehicle is stable, To derive the torque capacity based on the clutch input torque and the clutch pressure, to execute learning of the derived torque capacity with respect to the error of the input torque, and to update the torque capacity learning value, A torque capacity learning unit 150, and a clutch hydraulic pressure control unit 170. The clutch control unit 170 controls the torque capacity learning unit 150,

The clutch 110 is directly coupled to transmit the power of the engine and / or the motor to the transmission (not shown).

When it is determined that the vehicle behavior is stabilized based on the change amount of the acceleration signal, the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque, the clutch torque capacity deriving unit 130 determines that the clutch deterioration and return spring And a controller that performs a slight slip of the clutch to eliminate a fine tremble phenomenon generated in the piston, and controls the clutch pressure and the clutch input torque ratio, which are received when the slip accumulation value is equal to or greater than a predetermined determination reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the threshold, Is derived as the clutch torque capacity.

Therefore, the derived torque capacity is derived by reflecting the clutch deterioration, the return spring repulsion pressure, and the characteristic variation of the piston.

At this time, the return spring repulsion pressure is a repulsive force of the return spring which is an operating mechanism in the clutch, and when the oil pressure is not applied to the repulsion pressure of the return spring, the clutch surface contact does not occur. However, when the elastic force of the return spring changes over time, the characteristics of the return spring vary.

Also, as the piston is also an operating mechanism in the clutch, its durability is degraded over time and the characteristics of the piston are changed.

The clutch torque capacity deriving unit 130 determines that the vehicle behavior is stabilized based on the change amount of the acceleration signal, the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque.

When it is determined that the behavior of the vehicle is stabilized, the clutch torque capacity deriving unit 130 performs fine slip control through the hydraulic control unit 150 of the clutch, and when the cumulative value of the slip amount, which is received at a predetermined cycle, The integrated value for the slip accumulation value is derived.

 The clutch control unit 130 receives the clutch input torque and the clutch pressure at the time when the slip accumulation value integrated value is equal to or greater than the predetermined threshold value, and derives the torque capacity based on the received clutch pressure torque and the clutch pressure.

At this time, the oil pressure of the clutch for performing the micro-slip is provided to the clutch 100 between the pre-stored maximum threshold value and the lowest threshold value for the micro-slip control, and the clutch 100 is provided with a smile Slip.

(The input speed and the output speed difference of the clutch) generated by the clutch 100 at a predetermined predetermined period and accumulates the slip amount when the slip accumulation value is equal to or higher than a predetermined determination reference value and the integrated value for the slip accumulation value is equal to or higher than the threshold The torque capacity is derived from the ratio of the clutch input torque and the input pressure.

The torque capacity derived from the clutch torque capacity deriving unit 130 proceeds to the clutch torque capacity learning unit 150. [

The clutch torque capacity learning section 150 learns the torque capacity derived based on the derived torque capacity, the clutch input torque of the predetermined cycle, and the predetermined maximum torque and the lowest torque, updates and updates the learning value .

That is, the clutch torque capacity learning unit 150 derives the clutch input torque difference inputted at a predetermined time (i, j) of a predetermined period and outputs the derived input torque difference and the derived input torque difference, The torque capacity learning value is derived from the previously determined proportional relation by receiving the previous torque capacity and the acceleration signal change amount and the input torque error.

The current torque capacity learning value can be derived using a well-known clutch transmission torque proportional relation, and the clutch transmission torque proportional relation is as shown in the following equation.

Torque capacity learning value = previous torque capacity + input torque error * exp ^{-1 (acceleration signal change amount)}

The clutch torque capacity learning unit 150 selects a torque capacity having a smaller value among the torque capacity learning value and the predetermined maximum torque and outputs a torque capacity having a larger value among the selected torque capacity and the preset lowest torque.

Then, the clutch torque capacity learning unit 1500 updates the derived torque capacity to the torque capacity learning value and stores the resulting torque capacity when it is determined that the derived torque capacity is within the maximum torque and the lowest torque range.

On the other hand, the clutch torque capacity learning unit 150 corrects the stored torque capacity learning value to a predetermined correction torque according to the oil temperature fluctuation, generates a hydraulic pressure control signal based on the corrected torque capacity learning value, And transmits it to the clutch hydraulic pressure controller 170.

A typical operation of the hybrid vehicle according to the present invention including the functions described above is the same as or similar to that of a general hybrid vehicle, and thus a detailed description thereof will be omitted.

When it is determined that the vehicle behavior is stabilized based on the change amount of the acceleration signal and the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque, the slip amount The clutch torque capacity is derived for the input torque error, and the learning value for the torque capacity is updated. The clutch torque capacity is calculated for the clutch torque capacity when the cumulative value is equal to or greater than the preset reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the preset threshold value Since the present invention is an after-mentioned storing method, only the operation thereof will be described in detail.

A series of processes of deriving the clutch torque capacity and performing learning on the derived clutch torque capacity to update the torque capacity learning value to execute the clutch hydraulic pressure control with the correct torque capacity will be described in more detail with reference to Fig.

2 is a flowchart showing the torque capacity learning process of the clutch torque capacity learning unit 150 with respect to the torque capacity derived from the clutch torque capacity deriving unit 130 shown in FIG. 1. Referring to FIG. 2, The vehicle clutch torque capacity learning process according to the embodiment will be described.

First, the clutch torque capacity deriving unit 130, through step 301, determines whether or not a predetermined vehicle behavior determination condition is satisfied based on the change amount of the acceleration signal, the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque And when the received vehicle behavior determination condition is satisfied, fine slip control is performed through the hydraulic control unit 150 of the clutch to derive the clutch torque capacity

The process of deriving the clutch torque capacity is as follows.

And supplies the hydraulic control signal to the clutch 110 via the clutch with the lowest critical pressure and the highest critical pressure and the lowest critical pressure generated by the clutch hydraulic pressure controller 150 for the fine slip control.

The clutch torque capacity deriving unit 130 receives and accumulates the slip amount received at a predetermined period of the fine slip control, compares the slip accumulation value with a predetermined reference value, and when the slip accumulation value is equal to or greater than the determination reference value The process proceeds to step 311 where an integrated value for the slip accumulation value is derived.

When the integrated value for the slip accumulation value is equal to or greater than a predetermined threshold value, the clutch torque capacity deriving unit 130 compares the integrated value and the predetermined threshold for the derived slip accumulation value, The capacity is derived.

The torque capacity supplied from the clutch torque capacity deriving unit 130 is provided to the torque capacity learning unit 150. [

The clutch torque capacity learning unit 150 receives the input torque Xi and Xj at a predetermined time point (i, j) of a predetermined period through a step 303 and derives an error of the received input torque Step 305).

The clutch torque capacity learning unit 150 derives the current clutch torque capacity learning value based on the previous torque capacity derived before the predetermined time point (i, j), the input torque error, and the acceleration signal variation amount (step 307).

Then, the clutch torque capacity learning unit 150 derives a torque capacity having a larger value among the current clutch torque capacity learning value and the predetermined maximum torque, whichever is smaller, and the predetermined minimum torque (step 309).

On the other hand, the clutch torque capacity learning unit 150 determines whether the torque capacity derived in step 309 is within the minimum torque and maximum torque range, and if the torque capacity is within the minimum torque and maximum torque range The torque capacity derived in the step 309 is updated to the torque capacity learning value and stored (steps 311 and 313).

Then, the clutch torque capacity learning unit 150 corrects the torque capacity learning value derived in the step 313 to a predetermined correction torque according to the variation of the oil temperature, and generates a hydraulic pressure control signal based on the corrected torque capacity learning value The generated hydraulic pressure control signal is transmitted to the clutch hydraulic pressure controller (step 315). Here, the correction torque to the variation of the oil temperature is stored in advance as the calibration data.

Meanwhile, the derived torque capacity is provided to the clutch hydraulic pressure control unit 170, and the clutch hydraulic pressure control unit 170 generates a hydraulic pressure control signal reflecting the derived torque capacity and provides it to the clutch 100.

If it is determined in step 311 that the torque capacity learning value is not within the predetermined range of the minimum torque and the maximum torque, the torque capacity learning value is set to the initial value, and then, in order to derive the torque capacity learning value of the next predetermined period, The process proceeds to step 301 (step 317)

According to the embodiment of the present invention, when the vehicle behavior is stabilized, when the slip accumulation value for the slip amount received in a predetermined cycle at the time of fine slip control of the clutch is equal to or greater than a predetermined reference value and the integrated value of the calculated slip accumulation value is equal to or greater than the threshold value The clutch pressure and the clutch input torque ratio are derived from the torque capacity and learning is performed on the derived torque capacity with respect to the input torque error and the acceleration signal variation to update and save the learned value for the torque capacity, The capacity learning value is corrected to a correction torque that reflects the oil temperature fluctuation, and is then provided to the clutch hydraulic pressure control.

Therefore, it is possible to actively learn the torque capacity with respect to the error of the input torque and the oil temperature, and to derive the accurate torque capacity, and by the incorrect control of the return spring repulsion pressure, clutch deterioration, It is possible to fundamentally eliminate a decrease in ride comfort and a decrease in shift feeling due to excessive slip of the clutch during running.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

When the slip accumulation value with respect to the slip amount received in a predetermined period during the slight slip control of the clutch is equal to or greater than a predetermined determination reference value and the integral value of the calculated slip accumulation value is equal to or greater than the threshold value, Learning is performed on the derived torque capacity to update the learning value for the torque capacity and stored, and the stored torque capacity learning value is corrected to the correction torque reflecting the oil temperature fluctuation, and then supplied to the clutch hydraulic pressure control , It is possible to actively learn the torque capacity against the error of the input torque and the oil temperature and to derive the accurate torque capacity, thereby making it possible to prevent the torque capacity from being varied due to the return spring repulsion pressure, clutch deterioration, The ride comfort is deteriorated due to excessive slip of the clutch during running It is possible to bring about a great improvement in the efficiency and reliability of operation of the vehicle clutch torque capacity learning apparatus and apparatus that can fundamentally eliminate a reduction in the transmission feeling and further improve the performance efficiency, Is not only sufficient but also practically usable because it can be practically carried out clearly.

Claims (4)

A clutch for transmitting the power of the vehicle to the transmission;
When it is determined that the vehicle behavior is stabilized based on the change amount of the acceleration signal and the input torque change amount of the clutch, the vehicle speed change amount, and the absolute value of the clutch input torque, the slip accumulation value for the slip amount received at the predetermined period in the fine slip control of the clutch A clutch torque capacity deriving part for deriving a clutch torque capacity at a time when the integrated value of the calculated slip accumulation value is equal to or greater than a preset reference value and is equal to or greater than a preset threshold value;
A clutch torque capacity learning unit that performs learning on the derived clutch torque capacity and updates a learning value for the torque capacity with respect to an error of an input torque and an acceleration signal variation amount received at a predetermined time point of a predetermined cycle; And
And a clutch hydraulic drive unit that executes hydraulic pressure control according to a hydraulic pressure control signal set based on the clutch torque capacity learning value and transmits the hydraulic pressure control signal to the clutch. A vehicle behavior determining process that determines that the vehicle behavior is stable based on the variation amount of the acceleration signal and the input torque variation amount of the clutch, the vehicle speed variation amount, and the absolute value of the clutch input torque;
When the vehicle behavior is stable, the slip accumulation value for the slip amount received at a predetermined period during the micro-slip control of the clutch is equal to or greater than a predetermined reference value, and the clutch input torque and clutch input pressure A torque capacity deriving step of deriving the torque capacity based on the torque capacity; And
A torque capacity derived before a predetermined time point of a predetermined cycle, a clutch input torque input at a predetermined time point of a predetermined cycle, and a preset maximum torque and minimum torque, And a torque capacity learning process for performing learning on the torque capacity derived from the torque capacity learning value and updating and storing the torque capacity learning value. 3. The method according to claim 2,
An input torque difference calculation step of receiving an input torque received at a predetermined time point of a predetermined cycle to calculate an input torque difference;
A torque capacity learning value derivation step of deriving a current torque capacity learning value from the input torque difference and a predetermined proportional relation based on the torque capacity and the acceleration signal variation amount before the predetermined time of the predetermined period;
A torque capacity deriving step of deriving a torque capacity having a larger value among a torque capacity having a smaller value among the current torque capacity learning value and a preset maximum torque and a preset lowest torque; And
And a torque capacity updating step of updating the torque capacity derived when the derived torque capacity is within the maximum torque and the lowest torque range, after updating the calculated torque capacity to a torque capacity learning value, . 4. The method according to claim 3, wherein the torque capacity updating step comprises:
And to transmit the generated hydraulic pressure control signal to the clutch hydraulic pressure control unit by correcting the stored torque capacity learning value to a predetermined correction torque according to the oil temperature variation and generating a hydraulic pressure control signal based on the corrected torque capacity learning value. Clutch torque capacity learning method.

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