JP4265455B2 - Clutch pack clogging detection method and apparatus, and clutch pack hydraulic control device - Google Patents

Description

  The present invention relates to a clutch pack clogging detection method, a clutch pack clogging detection device, and a clutch pack hydraulic control device, and in particular, a clutch pack clogging detection method and a clutch pack clogging detection device for detecting clogging of a clutch pack of an automatic transmission. And a hydraulic control device for the clutch pack.

  The clutch pack of the automatic transmission (hydraulic clutch hydraulic oil chamber) is filled directly with hydraulic oil via an oil supply path with linear solenoid bubbles, and the clutch plate hits the friction material as the hydraulic oil is filled. Contact (clog), the clutch plate is coupled. When filling the clutch pack with hydraulic fluid, the feedback controller generates a feedback controller output value for controlling the current value flowing through the solenoid coil of the linear solenoid valve to the target current value, and this feedback controller output value is set to the pulse width. Current control is performed by modulating (PWM) and supplying to a drive circuit such as a transistor connected to a solenoid coil.

  In the clutch control system of the automatic transmission, the characteristics greatly change before and after the clutch plate contacts (clogs) the friction material. Therefore, it is necessary to largely change the setting value of the clutch control command value before and after the clutch pack is clogged. For this reason, it is necessary to detect clogging of the clutch pack. However, in the method of detecting the position of the clutch plate using the stroke sensor, it is necessary to newly install the stroke sensor, which increases the cost.

Also, as a method for detecting the position of the moving body, it is generated in the solenoid coil in accordance with the movement in the moving body of the hydraulic driving force transmission device having the moving body housed in the housing and sliding in the axial direction by the electromagnetic force of the solenoid coil. A position detection method for detecting a counter electromotive force to be detected and detecting a position of a moving body from a change in the counter electromotive force is known (see, for example, Patent Document 1). In this position detection method, when the current value flowing through the solenoid coil has a minimum value, the maximum value I ₀ and the minimum value I _P are extracted at predetermined time intervals (for example, 40 msec intervals), and I ₀ −I _P > 0. .2 [A], it is determined that the spool is operating normally, and if I ₀ -I _P ≦ 0.2 [A], it is determined that the spool has failed.
JP-A-6-213257

  However, when applying the position detection method described above to detect a clutch pack clogging in an automatic transmission, the current value flowing through the solenoid coil of the linear solenoid valve is feedback controlled in the clutch pack. The counter electromotive force is regarded as a disturbance, and feedback control is performed so as to cancel the counter electromotive force. For this reason, even when trying to detect clutch pack clogging using the maximum and minimum values of the back electromotive force generated in the solenoid coil as in the prior art, the difference between the maximum and minimum values is very small and difficult to detect. It is. Furthermore, when the first fill (rapid filling) control is performed in the initial stage, that is, when the duty command value is changed greatly, the current value change is caused by the spool displacement or the duty command value is changed greatly. There is a problem that it is difficult to distinguish whether the clutch pack is clogged, and it is difficult to detect clogging of the clutch pack.

  The present invention has been made to solve the above-described problems. A clutch pack clogging detection method capable of detecting clogging of a clutch pack without adding a new sensor, and a clutch pack clogging using this method. It is an object of the present invention to provide a detection device and a clutch pack hydraulic control device having a clutch pack clogging detection function.

In order to achieve the above object, the clutch pack clogging detection method of the present invention is filled with hydraulic oil through an oil supply path in which the amount of oil flowing by a valve equipped with an electromagnetic actuator is controlled. A clutch pack clogging detection method for detecting clutch pack clogging of a clutch pack that is controlled so that a current value flowing through a solenoid coil becomes a target current value by a feedback controller output value, wherein the clutch pack clogging detection method is performed during a predetermined detection window period. The feedback controller output value is detected, and the detected feedback controller output value during the detection window period, and within the detection window, takes a maximum value that is constant for a certain period of time, and then decreases for a certain period of time with a negative slope, Moreover clutch defined to take a certain time constant minimum value Tsu calculates the degree of coincidence between the reference pattern when clogging click, to detect clogging clutch pack of the clutch pack is compared with a predetermined threshold and the coincidence degree.

The clutch pack clogging detection device of the present invention is filled with hydraulic oil through an oil supply path in which the amount of oil flowing by a valve equipped with an electromagnetic actuator is controlled, and the current value flowing through the solenoid coil of the electromagnetic actuator is fed back. A clutch pack clogging detection device that detects clogging of a clutch pack that is controlled to reach a target current value based on a controller output value, and detects the feedback controller output value during a predetermined detection window. The detection means, the detected feedback controller output value during the period of the detection window, and a maximum value that is constant for a certain period of time within the detection window, then decrease for a certain period of time with a negative slope, and further constant for a certain period of time. when clogging clutch pack defined as a minimum value Is configured to include a calculating means for calculating a coincidence degree between quasi pattern, a blockage detection means for detecting clogging clutch pack of the clutch pack is compared with a predetermined threshold and the coincidence degree, the.

A hydraulic pressure control device for a clutch pack according to the present invention is provided in an oil supply path that communicates with the clutch pack and supplies hydraulic oil to the clutch pack , and controls a valve that controls the amount of oil flowing through the oil supply path. An electromagnetic actuator having a solenoid coil to be driven; a current detection means for detecting a current value flowing through the solenoid coil; and a current flowing through the solenoid coil based on a current value and a target current value detected by the current detection means A feedback controller that outputs a feedback controller output value for controlling the value to be equal to the target current value, a signal detection means for detecting the feedback controller output value during a predetermined detection window, and the signal feedback in the period of the detection window that has been detected by the detection means A controller output value, within the detection window, taking a certain time constant maximum value, then decreased a predetermined time at a negative slope, the reference when clogging further clutch pack defined to take a certain time constant minimum value A calculation means for calculating the degree of coincidence with the pattern, and a clogging detection means for detecting clogging of the clutch pack by comparing the degree of coincidence with a predetermined threshold value may be included.

When the clutch pack is clogged, the feedback controller output value changes with a characteristic waveform. In the respective inventions described above, in the detection window, a waveform with the characteristics set in advance as a reference pattern when clogging clutch pack detects the feedback controller output value in the period of the detection window of the detected detection window The degree of coincidence between the feedback controller output value and the reference pattern during the period is calculated, and the degree of coincidence is compared with a predetermined threshold value to detect clogging of the clutch pack.

As described above, according to the present invention, the clutch pack is detected by comparing the feedback controller output value with the reference pattern at the time of clutch pack clogging, so that the clutch pack can be detected without adding a new sensor. The effect that it is possible to detect clogging is obtained.

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

  As shown in FIG. 1, an oil supply passage 16 for filling hydraulic oil into the clutch pack 10 is communicated with the clutch pack 10 of the automatic transmission for vehicles in which a plurality of clutch plates 12 and 14 are housed. Yes. An accumulator 18 is attached in the middle of the oil supply path 16, and a linear solenoid valve 20 constituting a hydraulic control device for a clutch pack that controls the amount of oil flowing through the oil supply path 16 is located upstream of the position where the accumulator 18 is attached. Is attached.

  The linear solenoid valve 20 includes an electromagnetic actuator provided with a solenoid coil 22 and a plunger 26 provided with a spool 24 formed at the tip side and movable in the axial direction by the electromagnetic force of the solenoid coil 22. .

  As shown in FIG. 2, one end of the solenoid coil 22 is connected to the in-vehicle battery, and the other end of the solenoid coil 22 is connected to the current control circuit. The current control circuit is a current sensor for detecting the actual current flowing through the field effect transistor Tr, the protective Zener diode D, the pulse width modulator (PWM) 26, the feedback controller 28, the subtractor 30, and the solenoid coil 22. Current detection resistor Rs.

  The output terminal of the PWM 26 is connected to the gate of the field effect transistor Tr. The field effect transistor Tr drain is connected to the other end of the solenoid coil 22. The cathode of the Zener diode D is connected to the drain of the field effect transistor Tr, and the anode of the Zener diode D is connected to the source of the field effect transistor Tr.

  One end of the current detection resistor Rs is connected to the source of the field effect transistor Tr, and the other end is connected to the − terminal of the subtractor 30. A target current value as a current command for obtaining a command oil pressure is input to the + terminal of the subtracter 30, and the output terminal of the subtracter 30 is connected to the input terminal of the feedback controller 28.

  The output end of the feedback controller 28 is connected to the input end of the PWM 26 and is also connected to a pack jamming determination device 32 constituted by a microcomputer. The feedback controller 28 can be composed of a proportional integral differentiator.

  Next, an operation of the present embodiment and a pack jamming determination routine executed by the pack jammer will be described.

  The value of the current flowing through the solenoid coil 22 is detected by the current detection resistor Rs and input to the subtracter 30. Since the current target value is input to the subtracter 30, a deviation obtained by subtracting the detected current value from the current target value is input to the feedback controller 28. In the feedback controller 28, a feedback controller output value for making the deviation zero, that is, a feedback controller output value for controlling the current value flowing through the solenoid coil 22 to the current target value is generated. The generated feedback controller output value, that is, a feedback control signal is input to the PWM 26, and a drive signal having a predetermined duty ratio is output from the PWM 26. This drive signal is input to the gate of the field effect transistor Tr, and the field effect transistor Tr is ON / OFF controlled by this drive signal. As a result, the current flowing through the solenoid coil is feedback-controlled, and as a result, the amount of oil flowing through the oil supply path is controlled. As a result, the hydraulic pressure in the clutch pack increases with time, and the hydraulic pressure is stabilized after a predetermined time after the clogging of the clutch pack occurs.

  When the clutch pack is clogged, the oil flow rate decreases and the hydraulic pressure increases rapidly, so that the feedback pressure acts on the spool and the spool is displaced. Further, after the clutch pack is clogged, the oil flow rate is lowered and the spool is displaced even when the command oil pressure and the actual oil pressure become equal and the oil pressure is stabilized.

  Due to the displacement of the spool, the plunger of the linear solenoid is displaced, and a back electromotive force is generated in the solenoid coil.

  The back electromotive force generated when the clutch pack is clogged and the back electromotive force generated when the hydraulic pressure is settled are input as disturbances to the feedback controller 28. Therefore, the feedback controller output value output from the feedback controller 28 Decreases for example in the time period from 1.8 seconds to 2.8 seconds, and acts to cancel back electromotive force.

  FIG. 3 shows an example in which the clutch pack packing control is performed by giving a constant duty ratio (for example, 3 levels) from the clutch released state. At the time indicated by the arrows in the figure, the feedback controller output value changes so as to decrease due to clutch pack clogging. Also, in the vicinity of 0.2 seconds, the feedback controller output value changes greatly due to the change of the duty command value.

  FIG. 4 partially shows a waveform in which the entire waveform is enlarged by offsetting the waveform of the feedback controller output value of FIG. 3 in the direction of the origin along the vertical axis. In FIG. 4, a preset reference pattern P for detection is shown superimposed. This reference pattern P is determined to take a maximum value that is constant for a certain period of time within a predetermined detection window W, then decreases for a certain period of time with a negative slope, and further takes a minimum value that is constant for a certain period of time. .

  In the present embodiment, the feedback controller output value in the period of the detection window W is detected, and the degree of coincidence between the detected feedback controller output value and the reference pattern P is detected. The degree of coincidence is detected by calculating an average residual Δ (i) between the value of the reference pattern shown in the following formula and the measured value of the feedback controller output value at each sampling time i.

Here, y _std (k) is the value of the reference pattern at the sampling time k, and y _mem (k) is the measured value of the feedback controller output value at the sampling time k. However, k = 1, 2, 3,... N. Further, when k = 1, the values of all y _mem (k) are offset so that y _std (1) = y _mem (1).

The higher the degree of coincidence between the reference pattern value y _std (k) and the feedback controller output value measurement value y _mem (k), the higher the degree of coincidence between the reference pattern value y _std (k) and the feedback controller output value measurement value y _mem ( Since the difference from k) becomes smaller, the average residual Δ (i) becomes smaller.

  Therefore, as shown in FIG. 5, by setting a threshold for detecting the degree of coincidence and determining whether the average residual Δ (i) is equal to or lower than the threshold, the average residual Δ (i) is The point of time below can be detected as a clutch pack clogging.

Therefore, the pack jamming determination device 32 of the present embodiment measures the feedback controller output value (Ia) by capturing the feedback controller output value at every sampling time i and converting it into digital at step 100 shown in FIG. In the next step 102, the measured sampling values y _mem (k) (where k = 1, 2, 3,... N) for the past n times are stored in the memory of the pack jamming determination device 32.

In the next step 104, the value y _std (k) of the reference pattern P previously stored in the memory of the clutch pack clogging determiner is read. In step 106, the average residual Δ (i) is calculated according to the above equation (1). To do.

  In step 108, the calculated average residual Δ (i) is compared with a threshold, and when the average residual Δ (i) is equal to or less than the threshold, it is determined that the clutch pack is clogged, and the clutch pack clogging detection flag is set. Set as shown in FIG.

  In the above description, an example in which clutch pack clogging is detected using the measurement value of the feedback controller output value has been described. However, the current value flowing through the solenoid coil may be detected to detect clutch pack clogging. As shown in FIG. 8, the clutch pack clogging determination device in this case is connected between the current detection resistor Rs and the subtractor, and uses the current value flowing through the solenoid coil instead of the measured value of the feedback controller output value. The average residual Δ (i) is calculated by the equation (1), and when the average residual Δ (i) becomes equal to or less than the threshold value, it is determined that the clutch pack is clogged, and the clutch pack clogging detection flag is set.

  The above reference pattern is represented by a waveform that changes from the maximum value to the minimum value of the feedback controller output value along a curve represented by a negative slope, but the feedback controller output value in the detection window W The reference pattern waveform may be modified into another shape according to the maximum value and the minimum value of the measured values.

  In addition, although an example in which the degree of coincidence is detected from the average residual has been described above, the degree of coincidence may be detected using a least square method, a maximum likelihood estimation method, or the like.

It is a figure which shows a part of clutch pack and hydraulic control apparatus which can apply this invention. It is a block diagram which shows the current control apparatus which controls the electric current which flows into the solenoid coil of embodiment of this invention. It is a graph which shows the response waveform of the feedback controller output value when a current command value is changed. It is a graph which shows the response waveform of the feedback controller output value of FIG. 3, and the reference | standard pattern of this Embodiment. It is a graph which shows an average residual and a threshold value. It is a diagram which shows the state of a flag when clutch pack clogging is detected. It is a flowchart which shows the routine which detects clutch pack clogging of embodiment of this invention. It is a block diagram which shows the current control apparatus which controls the electric current which flows into the solenoid coil of other embodiment of this invention.

Explanation of symbols

10 Clutch pack 20 Linear solenoid valve 22 Solenoid coil

Claims (3)

The hydraulic oil is filled through an oil supply path in which the amount of oil flowing by a valve equipped with an electromagnetic actuator is controlled, and the current value flowing through the solenoid coil of the electromagnetic actuator becomes a target current value based on the feedback controller output value. A clutch pack jam detection method for detecting clutch pack jam of a clutch pack controlled by
Detecting the feedback controller output value during a predetermined detection window period ;
The detected feedback controller output value during the period of the detection window and a maximum value that is constant for a certain period of time within the detection window, then decrease for a certain period of time with a negative slope, and further take a minimum value that is constant for a certain period of time. Calculate the degree of coincidence with the reference pattern when the clutch pack is fixed as follows :
A clutch pack jam detection method for detecting clutch pack jam of a clutch pack by comparing the degree of coincidence with a predetermined threshold. The hydraulic oil is filled through an oil supply path in which the amount of oil flowing by a valve equipped with an electromagnetic actuator is controlled, and the current value flowing through the solenoid coil of the electromagnetic actuator becomes a target current value based on the feedback controller output value. A clutch pack clogging detection device that detects clogging of a clutch pack controlled by a clutch pack,
Detecting means for detecting the output value of the feedback controller in a predetermined detection window period ;
The detected feedback controller output value during the period of the detection window and a maximum value that is constant for a certain period of time within the detection window, then decrease for a certain period of time with a negative slope, and further take a minimum value that is constant for a certain period of time. Calculating means for calculating the degree of coincidence with the reference pattern at the time of clogging the clutch pack,
A clogging detection means for detecting clogging of the clutch pack by comparing the degree of coincidence with a predetermined threshold;
Clutch pack clogging detection device. It communicates with the clutch pack and provided oil supply passage for supplying hydraulic fluid to said clutch pack, and a valve for controlling the amount of oil flowing to the oil supply path,
An electromagnetic actuator comprising a solenoid coil for driving the valve;
Current detecting means for detecting a current value flowing through the solenoid coil;
A feedback controller that outputs a feedback controller output value for controlling the current value flowing through the solenoid coil to be the target current value based on the current value and the target current value detected by the current detection unit;
Signal detection means for detecting the feedback controller output value during a predetermined detection window ;
The feedback controller output value detected during the detection window period detected by the signal detection means, and a maximum value that is constant for a certain period of time within the detection window, then decreases for a certain period of time with a negative slope, and then is constant for a certain period of time. Calculating means for calculating the degree of coincidence with a reference pattern at the time of clutch pack clogging determined to take the minimum value of
A clogging detection means for detecting clogging of the clutch pack by comparing the degree of coincidence with a predetermined threshold;
Including clutch pack hydraulic control device.

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