JP2007177538A - Clutch slip detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a clutch slip, while a driven body is at a stopped state, through a low cost constitution. <P>SOLUTION: The clutch slip detection device is provided with a rotating sensor 13 for detecting the rotation of the driven side rotating body 12 on a slide door 1 side, in a meshing clutch 9 provided between a motor 7 and a slide door 1, in which a control unit 8 is provided with a speed calculation part 14a for calculating the actual speed (movement) of the slide door based on a pulse signal P output by the rotating sensor 13, and a slip detection part 14b which decides a clutch to be slipping when the rotational speed the actual speed of which is more than a predetermined value exceeds a specified value, and the predetermined value is set as a threshold value capable of detecting a momentary high speed when a driven side rotating body is flipped and the actual speed and the predetermined value are compared with each other to detect the clutch slip. The clutch slip can be detected with only the rotating sensor on a second member side, with simplification of the device and a reduction in cost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a clutch slip detection device in a structure in which a clutch is provided between a motor and a driven body.

Conventionally, a torque transmission device provided with a clutch between the motor and a driven body driven by the motor is selectively used for various machines. For example, an automatic sliding door of an automobile is used. There is an opening / closing device (see, for example, Patent Document 1).
JP 2004-100345 A

  On the other hand, there are friction clutches and meshing clutches as clutches, and meshing clutches are desired for devices that require reliable and large torque transmission when the clutch is engaged. In the meshing clutch, as shown in FIG. 5 (a), teeth 11a and 12a each having a chevron cross section are provided around the mutually opposing surfaces of the first member 11 and the second member 12 constituting the clutch. Some are arranged in the direction. By making the teeth 11a and 12a meshed in this way have a chevron cross-sectional shape, the members 11 and 12 can be smoothly meshed with each other.

  In the illustrated example, it is assumed that the first member 11 is an electromagnetic clutch connected to a drive source, and the second member 12 is connected to a driven body. Assuming that the rotation direction of the first member 11 is the direction of the arrow A, the second member 12 integrally rotates with the first member 11 in the direction of the arrow A in a state of being engaged with each other.

  However, for example, when the first member 11 continues to rotate even when the driven body reaches the displacement end and the rotation of the second member 12 stops, the teeth 11a and 12a of both the members 11 and 12 are inclined. If the force to overcome the force is greater than the force to bring the members 11 and 12 into contact with each other, as shown by the arrow B in FIG. In this case, in the case where a rotation sensor is provided on the drive source side, the first member 11 continues to rotate, so that the stop of the driven body cannot be detected. When used, there is a problem that wasteful current flows and power consumption increases.

  Displacement of the driven body can be directly detected by providing a rotation sensor on the second member 12 on the driven body side. However, in the case of the movement over the teeth, the second member 12 is repelled by the rotation of the first member 11, and an elastic element is interposed between the second member 12 and the driven body. Will be displaced every time it is played. Therefore, there is a problem that the second member 12, that is, the driven body is erroneously determined to be displaced. For example, the above-mentioned problem can be solved by providing rotation sensors on both members 11 and 12, but there is a problem that the cost of the apparatus increases.

  In order to solve such problems and reliably detect slippage of the clutch when the driven body is stopped with an inexpensive configuration, in the present invention, the motor is driven by the motor. For detecting slippage at the time of torque transmission of a clutch provided between the driven member and having a first member connected to the motor and a second member connected to the driven member The clutch slip detection device according to claim 1, wherein pulse generation means for outputting a pulse wave according to the rotation of the second member, and the moving speed of the driven body are calculated based on the pulse width or period of the pulse wave Or a slip detecting means for determining that the clutch is slipping when it is detected that the moving speed has exceeded a predetermined value, or within a predetermined time of the moving speed. Strange There is the case where it is detected that becomes equal to or larger than a predetermined width has been assumed to have a slip detection means for determining that the slipping the clutch.

  In particular, it has position calculation means for calculating the position of the driven body by integrating the pulse waves, and the determination by the slip detection means is performed when the position of the driven body is in a predetermined region. And good. The clutch may be a meshing clutch, and the driven body may be a vehicle opening / closing body. The clutch may be an electromagnetic clutch.

  As described above, according to the present invention, the second member on the driven body side is provided with the pulse generating means for outputting the pulse wave according to the rotation, and the actual speed (moving speed) is calculated based on the pulse width or period. And setting a predetermined value as a threshold value that can detect an instantaneous high speed when the second member is bounced, and detecting slipping of the clutch by comparing the actual speed with the predetermined value. it can. Alternatively, since the interval between the pulse waves is narrower than that during normal operation when played, the change of the pulse waves becomes large. Thereby, it is possible to detect the slip when the change in the moving speed within the predetermined time becomes equal to or larger than the predetermined width. Since the clutch slip can be detected only by the rotation sensor on the second member side, the device can be simplified and the cost can be reduced.

  In particular, by determining the slip when the driven body is located in a predetermined area, for example, it can be limited to the vicinity of the stop position in the movement range of the driven body, thereby making useless detection control. This can be omitted and the control can be simplified. Further, in the meshing clutch, when the driven member stops and the first member on the driving side continues to rotate, the influence on the pulse waveform is likely to appear greatly when the second member is repelled. It is preferable to apply to. In addition, by applying to a driving device for a vehicle opening / closing body, a battery having a limited power is used as a power source in an automobile, so that it is possible to suppress unnecessary power consumption for the motor and the clutch by this device. Therefore, it can contribute to power saving. In addition, by applying to an apparatus using an electromagnetic clutch, it is not necessary to use a large electromagnetic clutch that can generate a large suction force in order to prevent slippage, and a minimum necessary suction force can be generated. It uses a compact electromagnetic clutch and can easily prevent slipping.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing an outline of a sliding door opening / closing drive device to which the present invention is applied. The slide door 1 as a driven body is provided so as to be slidable in the vehicle front-rear direction for getting on and off a rear seat of a vehicle (not shown), and a part of the upper and lower ends thereof is provided by a rail provided on a door sash (not shown). Guided and supported.

  A guide rail 2 is provided on the vehicle body so as to extend in the vehicle front-rear direction, and a wire 5 is wound around the pulley 4 disposed in the vicinity of both ends of the guide rail 2 so as to form an annular shape. It has been. The wire 5 includes an open-side wire 5a and a closed-side wire 5b as a pair of wires. The wire 5 is wound around each pulley 4 so as to rotate 180 degrees, and each end is integrally provided on the slide door 1. It is coupled to a roller rolling slider 3. With respect to the sliding door 1, the open side wire 5a extends to the open side, and the close side wire 5b extends to the close side.

  The other end portions of the open-side wire 5a and the closed-side wire 5b are wound in opposite directions to a drive drum 6a provided in the casing of the drive unit 6, and are also provided in the casing of the drive unit 6. 7 is connected to a drive drum 6a via, for example, an electromagnetic clutch 9 as a clutch. The motor 7 is driven and controlled by the control device 8, and the drive drum 6 a rotates forward and backward in accordance with the forward and backward rotation of the motor 7 in the connected state of the clutch 9, and the wire 5 reciprocates in the extending direction. As a result, the slider 3 reciprocates in the vehicle front-rear direction (left and right in the figure) while being guided by the guide rail 2, and the slide door 1 can automatically slide open and close.

  The slide door 1 can be held in its fully closed position and fully open position. In the sliding door 1 of the illustrated example, the roller of the slider 3 is protruded to the guide rail 2 of FIG. 1, for example, by a protruding stopper by being fixed by a locking means (latch mechanism or the like) not shown in the fully closed position. By moving over 2a, it is held at each position. In the fully open position, even when the sliding door 1 stops on an inclined ground where the sliding door 1 naturally slides in the closing direction, the slider 3 is moved by the driving force of the motor 7 until it gets over the protruding stopper 2a. The roller of the slider 3 is locked by the stopper 2a, and the slide door 1 is held at the fully open position.

  Further, the clutch 9 includes a driving side rotating body 11 as a first member and a driven side rotating body 12 as a second member in which chevron teeth that mesh with each other are arranged in the circumferential direction in the same manner as illustrated in the conventional example. The engagement between the two may be an electromagnetic force, and the separation may be a normal electromagnetic clutch by a spring force of a return spring. A rotation sensor 13 is provided as pulse generation means for detecting the rotation of the driven side rotating body 12 on the side connected to the slide door 1.

  The rotation sensor 13 may have a structure in which, for example, an annular magnetized body in which N and S poles are alternately arranged in the circumferential direction is fixed to the driven side rotating body 12, and a change in the magnetic pole is detected. Thereby, for example, as shown in FIG. 2, a two-phase pulse wave can be output, so that the rotation direction can also be detected. Note that the pulse generating means is not limited to the rotation sensor 13, and for example, a plurality of reflective tapes are respectively attached to two concentric circumferences so as to have a predetermined phase difference, and each reflected light is detected. It may be an optical sensor. In any case, it is sufficient if it outputs a pulse signal P that becomes a predetermined pulse wave with the rotation of the driven-side rotator 12, and only one phase may be used if the forward / reverse rotation direction is not controlled. .

  The pulse signal P from the rotation sensor 13 is input to the controller 8, and the controller 8 outputs a forward / reverse drive signal D to the motor 7. A main control circuit 14 configured using a CPU for performing each control is provided in the control device 8, and the slide door 1 is moved in the main control circuit 14 based on the pulse signal P. A speed calculation unit 14a as a speed calculation unit that calculates a speed (speed in the opening and closing direction), a slip detection unit 14b as a slip detection unit that detects the slip of the clutch 11 based on the pulse signal P, and a pulse signal P A position calculation unit 14c that integrates and calculates the position of the slide door 1 is provided. The main control circuit 14 performs duty control for adjusting the calculated slide speed to a preset target speed. These may be processed by a program.

  Further, the control device 8 is provided with a motor drive circuit 15 for supplying a current to the motor 7 according to the duty and a clutch drive circuit 16 for outputting control signals for connection and disconnection to the clutch 9. . Note that a switch unit 17 is electrically connected to the control device 8, and each signal is input to the main control circuit 14 only while, for example, each open / close switch of the switch unit 17 is operated. The circuit 14 outputs a duty control signal for driving the motor 7 forward / reversely to the motor drive circuit 14c in accordance with the open / close signal.

  A method for detecting clutch slippage in the opening / closing drive apparatus configured as described above will be described below. FIG. 3 shows a representative example of each waveform based on the pulse signal P when the sliding door 1 is driven from the fully closed position toward the fully opened position and the clutch 9 is slid at the fully opened position. The horizontal axis in the figure is time, but the vertical axis corresponds to each waveform, and the type differs for each waveform.

  The broken line in the figure is a preset target speed when the sliding door 1 is fully opened, and the solid line is the actual speed when drive control is performed to match the target speed. The actual speed is a value calculated by the speed calculation unit 14a based on the pulse signal P as described above. The two-dot chain line is the displacement amount of the slide door 1 (the fully closed position is 0). This amount of displacement can be expressed by the count number (integrated value) of the pulse signal P that is reset at the fully closed position and generated along with the movement in the opening direction. The dotted line is the pulse width of the pulse signal P (B in FIG. 2), and specifically, it may be an average value for several consecutive pulses. Alternatively, the cycle of the pulse signal P (T in FIG. 2) may be used.

  When an open signal is input from the switch unit 17, a drive signal is output to the motor 7 according to the target speed (broken line), and the moving speed of the sliding door 1 substantially follows the target speed as shown by the solid line in FIG. And change. Along with this, the position of the slide door 1 (door position) reaches the vicinity of the fully open position as shown by the two-dot chain line in the figure. In the illustrated example, an area from a predetermined position before the fully open position to the fully open position is set as a slip detection area.

  Next, the control procedure will be described with reference to the flow of FIG. 4 set as a subroutine. In the execution of the flow of FIG. 4, the start thereof may be, for example, an open signal input of the switch unit 17, and thereafter repeatedly executed at a predetermined timing.

  First, in step ST1, it is determined whether or not the slide door 1 has reached the slip detection region from the position information calculated by the position calculation unit 14c as described above. If it is determined in step ST1 that the slip detection area has been reached, the process proceeds to step ST2, and if it is determined that the slip detection area has not been reached, the current routine is terminated. In step ST2, it is determined whether or not the actual speed V is greater than or equal to a predetermined value Vd. If it is determined that the actual speed V is greater than or equal to the predetermined value Vd, the process proceeds to step ST3 and the predetermined value Vd is not reached. If it is determined, the current routine is terminated.

  In step ST3, 1 is added to the value of the count C. This count C is the number of times it is determined that the actual speed V exceeds the predetermined value Vd, and is reset to 0 in the initial state. In the next step ST4, it is determined whether or not the count C is equal to or greater than the specified value Cd. If it is determined that the count C is equal to or greater than the specified value Cd, the process proceeds to step ST5 and it is determined that the specified value Cd is not reached. In this case, the current routine is terminated. In step ST5, when the process proceeds from step ST4 to step ST5, it is determined that slip has occurred in the clutch 9, and a stop process is performed. As the stop processing, the motor 7 is stopped, the counter C is reset, and this routine is terminated.

  As a result, in the apparatus using the meshing clutch, the clutch slip can be detected only by providing the rotation sensor 13 on one member of the clutch (the driven side rotating body 12 as the second member). Thus, an inexpensive clutch slip detection device can be realized. In the illustrated example, the meshing clutch is shown, but the present apparatus can also be applied to a friction clutch. The friction clutch is also effective because a phenomenon may occur where the driven side continues to rotate when the driven side stops, and may be struck.

  The predetermined value Vd for determining the speed V is set higher than the maximum value of the target speed as shown in FIG. 3, and the peak value of the actual speed V calculated when the mesh clutch is bounced. Is a value that can be detected. Specifically, it may be a value based on experimental data using the same apparatus as the product. The specified value Cd is set to 2 or more in consideration of the count in the case of noise or the like, but when slipping occurs based on experimental data as described above without setting an unnecessarily large number. It is preferable to set the value to suppress the generation of unnecessary power consumption as much as possible.

  In the above example, the slip is determined based on the number of times that the actual speed V is equal to or higher than the predetermined value Vd. However, as shown in FIG. 3, the change in the actual speed V increases when the slip is occurring. Whether the change width W is equal to or greater than the predetermined value Wd may be determined in step ST2. In the calculation of the change width W, the difference between the upper limit value and the lower limit value within a predetermined time can be set. In addition, since the pulse width (B in FIG. 2) that is a reference for calculating the actual speed V also changes (dotted line in FIG. 3), whether or not the pulse width B has become equal to or less than the predetermined value Bd as described above. You may make it discriminate | determine.

  Further, in step ST1 of FIG. 4, the sliding region is a region from a predetermined position before the fully opened position to the fully opened position. However, for example, it is considered that foreign matter is caught between the guide rails 2 and the sliding door 1 stops even in a half-open state. In order to execute the flow of FIG. 4 in the entire area of the slide range, step ST1 may be omitted or an arbitrary wide area may be set.

  Moreover, although the example applied to the drive device for a sliding door of an automobile is shown in the illustrated example, the present invention is not limited to a slide door and can be applied not only to a drive device targeting other various opening and closing bodies, The present invention can be applied to various drive devices with a machine tool or other clutch interposed.

1 is an overall view showing an outline of a sliding door opening / closing drive device to which the present invention is applied. It is a figure which shows the pulse waveform of a rotation sensor. It is a figure which shows the change of the target speed at the time of a full open operation | movement, real speed, door position, and pulse width, respectively. It is a flowchart which shows the control based on this invention. (A) is a figure which shows the shape of the tooth | gear of a meshing clutch, (b) is a figure corresponding to (a) which shows the state bounced.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding door 8 Control apparatus 7 Motor 9 Clutch 11 Drive side rotary body 12 Driven side rotary body 14a Speed calculation part, 14b Slip detection part, 14c Position calculation part

Claims (6)

During torque transmission of a clutch provided between a motor and a driven body driven by the motor and having a first member connected to the motor and a second member connected to the driven body A slip detection device for a clutch for detecting slippage in
Pulse generating means for outputting a pulse wave according to the rotation of the second member, speed calculating means for calculating the moving speed of the driven body based on the pulse width or period of the pulse wave, and the moving speed A slip detection device for a clutch, comprising: a slip detection means for determining that the clutch is slipping when it is detected that the value exceeds a predetermined value. During torque transmission of a clutch provided between a motor and a driven body driven by the motor and having a first member connected to the motor and a second member connected to the driven body A slip detection device for a clutch for detecting slip in
Pulse generating means for outputting a pulse wave according to the rotation of the second member, speed calculating means for calculating the moving speed of the driven body based on the pulse width or period of the pulse wave, A slip detection device for a clutch, comprising: slip detection means for determining that the clutch is slipping when it is detected that a change within a predetermined time is equal to or greater than a predetermined width. A position calculating means for calculating the position of the driven body by integrating the pulse wave;
The clutch slip detection device according to claim 1 or 2, wherein the determination by the slip detection means is performed when the position of the driven body is in a predetermined region.   4. The clutch slip detection device according to claim 1, wherein the clutch is a meshing clutch.   The clutch slip detection device according to any one of claims 1 to 4, wherein the driven body is a vehicle opening / closing body.   The clutch slip detection device according to any one of claims 1 to 5, wherein the clutch is an electromagnetic clutch.

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