KR20140121647A - Method and apparatus for diagnosing asynchronization of dual clutch transmission of vehicle - Google Patents

Abstract

The present invention discloses a method and a device for diagnosing asynchronism of a dual clutch transmission. According to the present invention, the device determines asynchronism for a pulse width modulation signal when the sum of a first time period from the hooking function operating point of a second pulse width modulation signal to the ending point of a third pulse width modulation signal and a second time period from the ending point of a fourth pulse width modulation signal to the hooking function operating point is smaller than a third time period from the hooking function operating point of the second pulse width modulation signal to the hooking function operating point of the fourth pulse width modulation signal and then initializes a PWM generation unit when the pulse width modulation signals become asynchronous. Therefore, the device can easily detect asynchronism for the pulse width modulation signals without big load and fundamentally remove radiated noise caused by asynchronism for the pulse width modulation signals. Also, the device can more improve reliability of a dual clutch transmission.

Description

≪ Desc / Clms Page number 1 > METHOD AND APPARATUS FOR DIAGNOSING ASYNCHRONIZATION OF DUAL CLUTCH TRANSMISSION OF VEHICLE &

The present invention relates to a method and apparatus for asynchronous diagnosis of a dual clutch transmission, and more particularly, to a method and apparatus for asynchronous diagnosis of a dual clutch transmission, which can eliminate radiation noise caused by asynchronization of a clutch and a pulse- .

BACKGROUND ART [0002] Generally, an automatic transmission for a vehicle is provided with a shift control device for automatically controlling a speed change ratio in accordance with a running speed and a load of a vehicle. Such a shift control device is provided with a shift control device The solenoid valve of the solenoid valve is controlled to control the hydraulic pressure so that the transmission of the target speed change stage is operated and the shift is automatically performed.

That is, the target speed change stage is determined from the speed change pattern map table in which the shift control device is set according to the running speed of the vehicle and the opening rate of the throttle valve, and the duty for the target speed change stage control is referred to as engine speed, (Solenoid valve) is operated with the extracted duty to actuate a plurality of operating elements including a clutch and a brake, so that automatic shifting is performed to the target speed change stage .

The automatic transmission operated in accordance with the operating principle thus has a friction element that is released from the operating state when the shifting to each corresponding target speed change stage is performed and a friction element that is changed from the disabled state to the operating state, The timing of the deactivation of the element and the start of operation determines the shifting performance of the automatic transmission.

In the transmission control device for controlling the dual clutch transmission having two clutches and two shafts for transmitting power, each of the clutches 1 and 2 and the shafts 1 and 2 is provided with a shift control device As shown, a pulse width modulation signal (PWM) is generated and driven in accordance with the generated pulse width modulation signal so that each of the clutches 1 and 2 and the shafts 1 and 2 rotate at the speed set by the target speed change stage.

However, when the pulse width modulation signals of the clutches 1 and 2 and the shafts 1 and 2 are not provided in synchronized with each other, emission noise occurs due to asynchronization of the pulse width modulation signal.

That is, in the frequency dispersion spectrum technique, a hooking function of changing the period of the pulse width modulation signal for each end of the pulse width modulation signal for one clutch is executed to detect asynchronism with respect to the pulse width modulation signal.

However, when the pulse width modulation signals of the clutches 1 and 2 and the shafts 1 and 2 are synchronized, if the frequency of the pulse width modulation signal of the clutch 1 is 16 kHz, the cycle of the remaining pulse width modulation signal should be the same as the pulse width modulation signal of the clutch 1 1, the shaft 1 is supplied with the same frequency as the pulse width modulation signal of the clutch 1 after elapse of the pulse width modulation signal of the clutch 1 and the constant delay time.

That is, when the pulse width modulated dispersion spectrum technique is used, the probability that the four pulse width modulated signals are asynchronized is reduced. However, as the load load of the microprocessor controlling the pulse width modulated signal is increased, The probability of non-synchronization occurrence with respect to the pulse width modulated signal is increased when the cycle is executed across

Further, as the execution timing of the hooking function is slowed down, the pulse width modulation signal of the next shaft or clutch is not supplied, causing asynchronism with respect to the pulse width modulation signal.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method and apparatus for synchronizing a pulse width modulated signal generated as a result of delayed execution of a hooking function with a pulse width modulated signal of a first one of the shafts, Width modulation signal end point and the second shaft pulse width modulated signal end point and the hooking function execution point, and when the diagnosis result indicates that the pulse width modulated signal is in an unsynchronized state, It is an object of the present invention to provide an asynchronous diagnostic method for a dual clutch transmission that can detect asynchronism with respect to a pulse width modulation signal simply by initializing a control device and fundamentally eliminate radiated noise due to asynchronism with a pulse width modulation signal .

According to a first aspect of the present invention, there is provided an asynchronous diagnostic method for a dual clutch transmission,

A method for asynchronous diagnosis of a dual clutch transmission which performs a shift to a target speed change stage in accordance with a duty of a pulse width modulation signal sequentially supplied to at least one of a clutch and a shaft,

Receiving a plurality of pulse width modulated signals sequentially supplied to each clutch and shaft,

Based on the execution timing of the hooking function of the second pulse width modulation signal, the end timing of the third pulse width modulation signal, and the generation timing of the fourth pulse width modulation signal and the execution timing of the hooking function among the plurality of pulse width modulation signals, Diagnosing asynchronism with the pulse width modulation signal of the transmission,

And initializing a shift control device for generating a pulse width modulation signal upon asynchronous determination of the pulse width modulation signal.

Preferably, the pulse width modulated signal asynchronous diagnostic step comprises:

The sum of the first time at the end of the third pulse width modulation signal and the end time of the fourth pulse width modulation signal and the second time at which the hooking function is executed, from the execution point of the hooking function of the second pulse width modulation signal, Width modulation signal is smaller than a third time of execution of the hooking function of the fourth pulse-width modulation signal from the time of execution of the hooking function of the 2-pulse-width modulation signal, it is determined to be asynchronous with respect to the pulse-width modulation signal.

Preferably, the pulse width modulated signal asynchronous diagnostic step comprises:

The sum of the first time at the end of the third pulse width modulation signal and the end time of the fourth pulse width modulation signal and the second time at which the hooking function is executed, from the execution point of the hooking function of the second pulse width modulation signal, Width modulation signal is not smaller than a third time from the execution time of the hooking function of the 2-pulse-width modulation signal to the execution time of the hooking function of the fourth pulse-width modulation signal.

According to a second aspect of the present invention, there is provided an asynchronous diagnosis apparatus for a dual clutch transmission,

A shift control unit that synchronously transfers a plurality of pulse width modulation signals sequentially to at least one of the clutches and the shafts,

And a dual clutch transmission in which the clutch and the shaft are rotated and shifted to a target speed change stage under the control of the shift control device,

Wherein the shift control unit includes:

A PWM generator for generating a plurality of pulse width modulation signals supplied to each of the clutches and the shafts,

Based on the execution timing of the hooking function of the second pulse width modulation signal, the end timing of the third pulse width modulation signal, and the generation timing of the fourth pulse width modulation signal and the execution timing of the hooking function among the plurality of pulse width modulation signals, An asynchronous diagnosis unit for diagnosing asynchronism with a pulse width modulation signal of the transmission;

And an asynchronous control unit for initializing the PWM generator when the pulse width modulation signal supplied to the clutch and the shaft is asynchronous.

As described above, the method and apparatus for asynchronous diagnosis of the dual clutch transmission according to the embodiment of the present invention are configured such that from the execution point of the hooking function of the second pulse width modulation signal to the first time at the end point of the third pulse width modulation signal, The sum of the end time of the 4 pulse width modulation signal and the second time of the execution of the hooking function is smaller than the third time of the hooking function execution time of the fourth pulse width modulation signal from the execution time of the hooking function of the second pulse width modulation signal The non-synchronization with respect to the pulse width modulated signal can be easily detected without a large load and the pulse width modulated signal can be easily detected as the pulse width modulated signal is asynchronous with respect to the pulse width modulated signal, The radiation noise due to the asynchronous operation can be fundamentally eliminated, and the reliability of the dual clutch transmission can be further improved.

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 waveform diagram showing a pulse width modulation signal supplied to each clutch and shaft of a general dual clutch transmission.
2 is a view showing a configuration of a dual clutch transmission according to an embodiment of the present invention.
3 is a waveform diagram showing a pulse width modulation signal supplied to each clutch and shaft of the dual clutch transmission according to the embodiment of the present invention.
4 is a flowchart illustrating an asynchronous diagnosis process of a dual clutch transmission 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.

FIG. 2 is a diagram showing an asynchronous diagnostic apparatus for a dual clutch according to an embodiment of the present invention, and FIG. 3 is a waveform diagram showing a pulse width modulation signal supplied to each clutch and shaft shown in FIG. An asynchronous diagnosis apparatus for a dual clutch transmission according to an embodiment of the present invention will be described by way of example only with reference to the asynchronous diagnosis apparatus for the pulse width modulated signal shown in FIG. 2 and FIG.

The asynchronous diagnosis apparatus for a dual clutch to which the embodiment of the present invention is applied is characterized in that the asynchronism of the pulse width modulation signal generated as the execution time of the hooking function is delayed is synchronized with the generation timing of the pulse width modulation signal of the first shaft Width modulation signal generation point and the second shaft pulse width modulation signal generation point and the second shaft pulse width modulation signal generation point and the hooking function execution point, and when the diagnostic result pulse width modulation signal is asynchronous, And a signal is initialized.

2, the shift control device of the automatic transmission according to the embodiment of the present invention is configured such that when the driving state of the current vehicle is input from the various sensors forming the engine control sensing part 10 to the ECU 20 , The ECU 20 compares these pieces of information with previously input data and controls the engine control driver 30 to control the engine in an optimal state.

At the same time, the ECU 20 sends information to the shift control unit 40 (hereinafter, referred to as TCU) so as to perform the shift control if information necessary for the shift control is present. At this time, The information input from the shift control sensing section 50 is compared with the stored data and the shift control drive section 60 is controlled to achieve optimal shift control.

The engine control sensing unit 10 may include all information necessary for engine control such as a vehicle speed sensor, a crank angle sensor, an engine speed sensor, a cooling water temperature sensor, a turbine speed sensor, a throttle position sensor, And the shift control sensing unit 50 refers to sensors that provide information necessary for shift control such as an input / output speed sensor, an oil temperature sensor, an inhibitor switch, a brake switch, and the like.

The engine control drive unit 30 means all the drive units for engine control and the shift control drive unit 60 means all the solenoid valves applied to the hydraulic control means of the automatic transmission.

Here, the shift control drive unit 60 includes two clutches, that is, a dual clutch, that is, a clutch that is directly connected or disconnected by the hydraulic pressure control unit to transmit the power generated by the engine control drive unit 30 to the shift control drive unit 60, And two shafts that receive and transmit power transmitted by the clutches.

Although the dual clutch transmission having two clutches has been described in the embodiment of the present invention, it will be apparent to those skilled in the art that the present invention is applicable to a multi-stage clutch transmission having a plurality of clutches.

In such a control system, in controlling the engagement and disengagement of the clutch of the friction element in the hydraulic control system, it is most preferable to make the shift while smoothly changing the rotation speed of the turbine.

That is, the TCU 40 generates first to fourth pulse width modulation signals PWM1 to PWM4 for driving the two clutches CL1 and CL2 and the shafts SH1 and SH2 of the shift control drive unit 60 Performs asynchronous diagnosis on the generated first to fourth pulse width modulation signals PWM1 to PWM4, and initializes the pulse width modulation signal (PWM) generation unit in the asynchronous diagnosis decision on the pulse width modulation signal do.

The TCU 40 includes a PWM generator 41 for generating first to fourth pulse width modulation signals for performing predefined hydraulic pressure control corresponding to a predefined target speed change stage, PWM4 of the PWM generation unit 41 when the PWM signal of the asynchronous diagnosis unit 43 is not synchronized with the asynchronous diagnosis unit 43. The asynchronous diagnosis unit 43 generates a pulse width modulation signal PWM1- .

The pulse width modulation signals PWM1 to PWM4 supplied to the clutches CL1 and CL2 and the shafts SH1 and SH2 are as shown in FIG.

Referring to FIG. 3, the first pulse width modulation signal PWM1 is a control signal for controlling the first clutch CL1, and the second pulse width modulation signal PWM2 is a control signal for controlling the first shaft SH1 The third pulse width modulation signal PWM3 is a control signal for controlling the second clutch CL2 and the fourth pulse width modulation signal PWM4 is a control signal for controlling the second shaft SH2 .

The PWM generator 41 generates the pulse width modulation signals synchronously at the same frequency and the generated pulse width modulation signals PWM1 to PWM4 are supplied to the asynchronous diagnosis unit 43. The asynchronous diagnosis unit 43, PWM4 diagnoses asynchronism with respect to the received first through fourth pulse width modulation signals PWM1 through PWM4.

That is, the asynchronous diagnosis unit 43 performs a hooking function of changing the period of the pulse width modulation signal at the end of each of the pulse width modulation signals PWM1-PWM4, It is diagnosed whether or not the pulse width modulation signal (PWM1-PWM4) is asynchronous based on the execution point of the function.

3, the first time T1 from the execution time of the hooking function of the second pulse width modulation signal PWM2 to the end time of the third pulse width modulation signal PWM3 and the fourth time width modulation signal PWM4 (T1 + T2) of the second time T2 from the end point of the first pulse width modulation signal PWM2 to the time point of execution of the hooking function of the fourth pulse width modulation signal PWM4 from the execution time of the hooking function of the second pulse width modulation signal PWM2 Is less than the third time (T3) up to the execution timing of the hooking function of the fourth pulse width modulation signal (PWM4), the asynchronous diagnosis section (43) judges asynchronous with respect to the pulse width modulation signal, The asynchronous determination result is supplied to the asynchronous control unit 45. [

The asynchronous control unit 45 initializes the PWM generation unit 41 when the asynchronous determination is made on the pulse width modulation signal.

The hooking function ( Hooking ) executed by the asynchronous diagnosis unit 43 Function ) is set at the end of each pulse width modulation signal ( PWM1-PWM4) The process of determining the asynchronous state with respect to the pulse width modulated signal based on the frequency dispersion spectrum of the changed pulse width modulated signal by varying the period of the pulse width modulated signal is a well known technique widely known to those skilled in the art, It is omitted.

The asynchronous diagnosis process of the dual clutch transmission according to the embodiment of the present invention will be described with reference to FIG.

The PWM generation section 41 generates the first to fourth pulse width modulation signals PWM1 to PWM4 supplied to the clutches CL1 and CL2 and the shafts SH1 and SH2 shown in Fig. 101).

Then, the asynchronous diagnosis unit 43 determines whether or not the PWM (Pulse Width Modulation) signal is output from the asynchronous diagnosis unit 43 based on the hooking function execution time point at which the end point of the generated first to fourth pulse width modulation signals PWM1 to PWM4 is executed, It is diagnosed whether or not the generator 41 is asynchronous with respect to the pulse width modulation signal.

That is, the asynchronous diagnosis unit 43 determines whether or not the first time T1 from the execution time of the hooking function of the second pulse width modulation signal PWM2 to the end time of the third pulse width modulation signal PWM3, The sum of the second time T2 of the execution time of the hooking function of the third pulse width modulation signal PWM4 from the end time of the pulse width modulation signal PWM4 is equal to the sum of the execution time of the hooking function execution time of the second pulse width modulation signal PWM2 Is smaller than a third time T3 from the start of the hooking of the fourth pulse width modulation signal PWM4 to the execution of the hooking of the fourth pulse width modulation signal PWM4 (step 103).

The asynchronous diagnosis unit 43 determines asynchronous if the sum of the first time and the second time T1 + T2 is less than the third time T3 as a result of the determination in step 103, 45 (step 105).

If the asynchronous diagnosis unit 43 determines that the pulse width modulation signal is asynchronous, the asynchronous control unit 45 initializes the PWM generation unit 41 (step 107).

However, if it is determined in step 103 that the sum of the first time and the second time T1 + T2 is not less than the third time T3, it is determined that the pulse width modulation signal is synchronized, The asynchronous control unit 45 retains the pulse width modulation signal of the current PWM generation unit 41 (steps 109 and 111).

Thereafter, the asynchronous control unit 45 determines whether or not the shift has been completed. If the shift is completed, the asynchronous control unit 45 ends the program. If the shift is not completed, the asynchronous control unit 45 proceeds to step 101 (step 113).

According to the embodiment of the present invention, the first time from the execution point of the hooking function of the second pulse width modulation signal to the end point of the third pulse width modulation signal, the end point of the fourth pulse width modulation signal, 2 time is less than the third time of the hooking function execution time of the fourth pulse width modulation signal from the execution of the hooking function of the second pulse width modulation signal, it is determined as asynchronous to the pulse width modulation signal, When the signal is in the asynchronous state, the non-synchronization with respect to the pulse width modulated signal can be easily detected and the radiated noise due to the asynchronous operation with respect to the pulse width modulated signal can be fundamentally eliminated, The reliability of the clutch transmission can be further improved.

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.

The sum of the first time at the end of the third pulse width modulation signal and the end time of the fourth pulse width modulation signal and the second time at which the hooking function is executed, from the execution point of the hooking function of the second pulse width modulation signal, Width modulation signal is smaller than a third time from the execution time of the hooking function execution time of the fourth pulse width modulation signal to the execution of the hooking function of the fourth pulse width modulation signal. When the pulse width modulation signal is asynchronous with respect to the pulse width modulation signal, It is possible to easily detect the asynchronism with respect to the pulse width modulated signal without a large load and fundamentally eliminate the radiated noise due to the asynchronism with the pulse width modulated signal and further improve the reliability with respect to the dual clutch transmission The present invention relates to an asynchronous diagnostic apparatus and method for a dual-clutch transmission, and more particularly, It is an invention that is industrially applicable because it is capable of bringing about the progress and being able to carry out the marketing of the applied vehicle or the possibility of operation as well as being practically and practically obvious.

Claims (4)

A method for asynchronous diagnosis of a dual clutch transmission which performs a shift to a target speed change stage in accordance with a duty of a pulse width modulation signal sequentially supplied to at least one of a clutch and a shaft,
Receiving a plurality of pulse width modulated signals sequentially supplied to each clutch and shaft,
Based on the execution timing of the hooking function of the second pulse width modulation signal, the end timing of the third pulse width modulation signal, and the generation timing of the fourth pulse width modulation signal and the execution timing of the hooking function among the plurality of pulse width modulation signals, Diagnosing asynchronism with the pulse width modulation signal of the transmission,
And initializing a shift control device for generating a pulse width modulation signal upon asynchronous determination of the pulse width modulation signal. 2. The method of claim 1, wherein the pulse width modulated signal asynchronous diagnostic step comprises:
The sum of the first time at the end of the third pulse width modulation signal and the end time of the fourth pulse width modulation signal and the second time at which the hooking function is executed, from the execution point of the hooking function of the second pulse width modulation signal, Width modulation signal is smaller than a third time of the execution of the hooking function of the fourth pulse width modulation signal from the time of execution of the hooking function of the dual pulse transmission signal, Diagnostic method. 2. The method of claim 1, wherein the pulse width modulated signal asynchronous diagnostic step comprises:
The sum of the first time at the end of the third pulse width modulation signal and the end time of the fourth pulse width modulation signal and the second time at which the hooking function is executed, from the execution point of the hooking function of the second pulse width modulation signal, Width modulation signal is not smaller than a third time from the execution time of the hooking function of the 2-pulse-width modulation signal to the time when the hooking function of the fourth pulse-width modulation signal is executed. Asynchronous diagnostic method. A shift control unit that synchronously transfers a plurality of pulse width modulation signals sequentially to at least one of the clutches and the shafts,
And a dual clutch transmission in which the clutch and the shaft are rotated and shifted to a target speed change stage under the control of the shift control device,
Wherein the shift control unit includes:
A PWM generator for generating a plurality of pulse width modulation signals supplied to each of the clutches and the shafts,
Based on the execution timing of the hooking function of the second pulse width modulation signal, the end timing of the third pulse width modulation signal, and the generation timing of the fourth pulse width modulation signal and the execution timing of the hooking function among the plurality of pulse width modulation signals, An asynchronous diagnosis unit for diagnosing asynchronism with a pulse width modulation signal of the transmission;
Further comprising an asynchronous control unit for initializing the PWM generator when the pulse width modulation signal supplied to the clutch and the shaft is asynchronous.

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