JP2006152685A - Power window device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power window device capable of quickly decelerating a window speed when a window member is closed in the case a closing operation of the window member is performed. <P>SOLUTION: When a rising operation of a PW switch 5 is performed in order to make the closing operation of a window pane in a closing state, a controller 6 drives a driving motor 4 by a relay circuit 7, the window pane is made to rise. In the case of the closing operation, the controller 6 calculates a remaining open amount of the window pane, and the comparison of the remaining open amount with a deceleration starting threshold is performed. When controller 6 decides that the remaining open amount is within the deceleration starting threshold (in other words, when the window pane is closed), first of all, an FET 8 is switched to an OFF state. Successively, the controller 6 connects a movable contact 15a of a relay contact 15 to the second fixed contact 15c in a state to connect a movable contact 13a of a relay contact 13 to the second fixed contact 13c, and the relay circuit 7 is changed into a short-circuit state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power window device that automatically lifts and lowers a window member by a predetermined opening / closing operation.

  Conventionally, for example, in a window glass of a vehicle, a safety device that prevents a human body part such as a finger or a hand from being sandwiched between the window glass and the window frame when the window glass is closed at the time of closing operation (when closed) is provided. Furthermore, speed control is performed when the window glass is closed, and the window speed when the window glass is raised is reduced to a constant low speed. An example of this technique is disclosed in, for example, Patent Literature 1, which employs PWM (Pulse Width Modulation) control as deceleration control for reducing the window speed of the window glass.

This will be described with reference to FIG. 7. In the PWM control, one of the two relay contacts 51, 52 is connected to the energizing side, and the other relay contact 52 is connected to the energizing side. This is a technique for performing speed control by switching of the FET 53 in a state where the GND is connected. When PWM control is performed, a voltage corresponding to the switching interval of the FET 53, that is, the duty ratio, is supplied to the drive motor 54 that is a drive source when the window glass is raised and lowered. Therefore, electric power lower than usual is supplied to the drive motor 54, and the window speed of the window glass becomes low.
JP 2002-168049 (page 4-9, FIG. 1)

  However, in the deceleration control using this PWM control, since the relay contact 51 is on the energization side and only the FET 53 is turned off, the drive motor 54 is not electrically braked, and the drive motor 54 It becomes idle state. The idling state here is a state in which both terminals of the drive motor 54 are not electrically connected, and in this state, the drive motor 54 rotates by inertia with the current driving force. Therefore, as shown in FIG. 8, even when the deceleration control is applied to the drive motor 54, there is a problem that it takes time until the window speed is sufficiently reduced.

  The objective of this invention is providing the power window apparatus which can decelerate rapidly the window speed at the time of closing of a window member at the time of closing operation of a window member.

  In order to solve the above problem, according to the first aspect of the present invention, when the lifting operation means is opened, the motor rotates in one direction, the window member is lowered, and the operation means is closed. When operated, the motor rotates in the other direction so that the window member is raised, and when the window member that is being raised closes during the closing operation of the window member, the motor is subjected to speed control to control the window. In a power window device that raises a member at a low speed, a relay circuit that rotates the motor in the one direction or the other direction by switching a current direction of the current that flows to the motor, and a detection unit that detects a current position of the window member And a control circuit for short-circuiting the relay circuit when it is determined that the window member during the closing operation has been closed based on the detection signal.

  According to the present invention, when the window member is closed during the closing operation of the window member, the relay circuit is short-circuited by the control circuit so as to reduce the window speed during the closing operation (that is, the rising speed of the window member). . When the relay circuit is short-circuited in this way, the motor is in a state of operating as a generator, thereby generating a braking force on the motor. Therefore, the rotational speed (number of rotations) of the motor that has been rotating so far rapidly decreases, and the window speed when the window member rises rapidly decreases as the motor rapidly decreases. Therefore, if the relay circuit is short-circuited when the window member is closed during the closing operation of the window member as in the present invention, the window speed at the time of closing can be quickly reduced.

  According to a second aspect of the present invention, in the first aspect of the present invention, the switching element connected to the motor circuit of the motor, a duty signal is output to the switching element, and the switching is performed at a duty ratio of the duty signal. A speed control circuit that raises the window member at a low speed by turning on and off the element, and the control circuit turns off the switching element when the window member during the closing operation is closed. And then short-circuiting the relay circuit.

  According to the present invention, in addition to the operation of the invention according to the first aspect, the window member is brought into the low speed rising state by the duty ratio control for repeatedly turning on and off the switching element connected to the motor circuit. Further, in the present invention, the relay circuit is short-circuited when the window member during the closing operation is closed, but when this short-circuiting is performed, the switching element is turned off prior to that. Here, for example, if the relay contact is switched while a current is flowing through the motor circuit, an excessive load is applied to the relay contact at the time of switching, and the contact is likely to be painful. However, if the switching element is turned off before short-circuiting as in the present invention, and the relay circuit is short-circuited after the motor circuit is in a state where no current flows, the relay contact can be connected without current flowing through the relay circuit. As a result, the durability of the relay contact is ensured.

  According to a third aspect of the present invention, in the second aspect of the present invention, the control circuit measures an elapsed time after the short circuit of the relay circuit, and the elapsed time becomes equal to or longer than a set time. The gist is to return the relay circuit to an energized state so as to release the short circuit, and then to raise the window member at the low speed by the speed control circuit.

  According to this invention, in addition to the operation of the invention according to claim 2, when the elapsed time after the relay circuit is short-circuited is longer than the set time, the short-circuit state is released by returning the relay circuit to the energized state. The Then, after the relay circuit is returned to the energized state, on / off of the switching element by the speed control circuit is started in order to raise the window member at a low speed. Here, for example, if the relay circuit is returned to the energized state when the switching element is in the on state, a large load is applied to the relay contact when the current flows to the motor, and the relay contact is easily painful. There arises a problem that the movable contact of the relay contact vibrates and generates sound. However, in the present invention, after the relay circuit enters the energized state, the switching element goes through the order of turning on, so that the durability of the relay contact is ensured and the relay contact is in the contact state. No sound is generated.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the relay circuit has two relay contacts connected to one side terminal and the other side terminal of the motor. And the control circuit performs a process of connecting both the relay contacts to the GND side as the short-circuit process.

  According to this invention, in addition to the operation of the invention according to any one of claims 1 to 3, the relay circuit is short-circuited by connecting each relay contact of the relay circuit to the GND side. By the way, on the board on which the relay circuit, the control circuit, etc. are mounted, the power line is overwhelmingly less than the GND line, so there is no lead wire connected to the motor terminal at the time of short circuit. If it is disconnected, there is a high possibility that the lead wire contacts a predetermined signal line or body ground and is connected to the GND. Therefore, for example, when using a method of short-circuiting the relay circuit by connecting each relay contact of the relay circuit to the power supply, if the lead wire is disconnected, the disconnected lead wire is connected to the GND side and the motor may malfunction. Becomes higher. However, if the method of short-circuiting the relay circuit with GND connection as in the present invention is used, the probability of motor malfunction will be reduced even if the lead wire is disconnected.

  ADVANTAGE OF THE INVENTION According to this invention, the window speed at the time of closing of a window member can be rapidly decelerated at the time of closing operation of a window member.

Hereinafter, an embodiment of a power window device embodying the present invention will be described with reference to FIGS.
FIG. 1 is a circuit diagram showing an electrical configuration of the power window device 1. The power window device 1 of this example is a device that automatically raises and lowers the window glass 3 of the side door 2 (see FIG. 2) of the vehicle by the driving force of the drive motor 4, and is a power window switch (hereinafter referred to as a PW switch). The drive motor 4 is driven based on the operation 5 to raise and lower the window glass 3. A PW switch 5 is provided for each side door 2, and a drive motor 4 is disposed on each side door 2 to raise and lower the window glass 3 of each side door 2 of the vehicle. The window glass 3 corresponds to a window member, and the drive motor 4 corresponds to a motor.

  The PW switch 5 is a switch provided on the inner side surface of the side door 2 and having, for example, a descending function, an ascending function, an automatic operation function (auto function), and the like. That is, the PW switch 5 is a two-stage click-type oscillating switch, and when one end side (downward side) or the other end side (upward side) is pressed by one step, the switch on the pressed side is turned on. The window glass 3 is lowered or raised. Further, when the PW switch 5 is pressed down two steps on the descending side or the ascending side, the switch on the pressed side becomes an automatic state, and the window glass 3 is continuously lowered and continuously raised until the switch is operated again. The PW switch 5 corresponds to an operation unit.

  The drive motor 4 is, for example, a direct current motor (DC motor), and is connected to the window glass 3 via a transmission mechanism (not shown) that converts the motor rotational force into a vertical linear motion and transmits it. For example, when the drive motor 4 rotates in the forward direction, the rotational force is converted into a downward linear motion through the transmission mechanism, and the window glass 3 is lowered by the downward force. On the other hand, when the drive motor 4 is reversed, the rotational force is converted into an upward linear motion through the transmission mechanism, and the window glass 3 is raised by the upward force.

  Further, when the power window device 1 of the present example closes the window glass 3, if the remaining opening amount Lx of the window glass 3 falls within the deceleration start threshold La, the deceleration control is performed to decelerate the rising speed of the window glass 3. To switch the window speed to low speed. In order to prevent a finger or the like from being sandwiched between the window glass 3 and the window frame 2a when the window glass 3 is closed, the rising speed of the window glass 3 is reduced by deceleration when the window glass 3 is closed. This makes it difficult to pinch fingers or the like. In this example, the distance from the full opening to the full closing of the window glass 3 is set to 400 mm or more, for example, and the deceleration start threshold La is set to 30 mm, for example.

  As shown in FIG. 1, the power window device 1 is supplied to a controller 6 that performs overall control of the device 1, a relay circuit 7 that drives the drive motor 4 based on a command from the controller 6, and the drive motor 4. An FET (Field Effect Transistor) 8 for adjusting the amount of electric power is provided. The PW switch 5 is connected to the controller 6 via the switch signal input circuit 9, and outputs a switch signal corresponding to its own switch state to the controller 6 via the switch signal input circuit 9. The controller 6 recognizes the switch state of the PW switch 5 based on the switch signal input from the PW switch 5. The controller 6 constitutes a control circuit and a speed control circuit, and the FET 8 corresponds to a switching element.

  The relay circuit 7 drives and controls the drive motor 4 based on a control signal from the controller 6. For example, when the relay circuit 7 inputs a command based on the lowering operation of the PW switch 5 from the controller 6, the relay motor 7 rotates the drive motor 4 forward based on the command to lower the window glass 3. When the relay circuit 7 inputs a command based on the raising operation of the PW switch 5 from the controller 6, the relay circuit 7 reverses the drive motor 4 based on the command to raise the window glass 3. At this time, the relay circuit 7 controls the amount of power supplied to the drive motor 4 so that the window glass 3 moves up and down at a predetermined lowering speed or rising speed.

  Here, the relay circuit 7 will be described in detail below. The relay circuit 7 includes a first relay 10 that switches a contact state of one side terminal (plus terminal) of the drive motor 4 and a second relay 11 that switches a contact state of the other side terminal (minus terminal) of the drive motor 4. ing. The first relay 10 includes a coil 12 and a relay contact 13, and the coil 12 has one end connected to the battery B and the other end connected to the controller 6. The second relay 11 includes a coil 14 and a relay contact 15, and the coil 14 has one end connected to the battery B and the other end connected to the controller 6. Protection diodes 16 and 17 are connected between the terminals of the coils 12 and 14, respectively.

  The relay contact 13 is a transfer contact, and has a movable contact 13a, a first fixed contact 13b, and a second fixed contact 13c. The movable contact 13a is connected to one terminal of the drive motor 4 and can be connected to one of the first fixed contact 13b and the second fixed contact 13c. The first fixed contact 13b is connected to the battery B, and the second fixed contact 13c is connected to GND via the FET 8. The movable contact 13a is connected to the second fixed contact 13c on the GND side when the coil 12 is demagnetized, which is normal, and when the coil 12 is excited based on a command from the controller 6, the first fixed on the battery B side is connected. Connected to the contact 13b.

  The relay contact 15 is a transfer contact and has a movable contact 15a, a first fixed contact 15b, and a second fixed contact 15c. The movable contact 15a is connected to the other terminal of the drive motor 4, and can be connected to one of the first fixed contact 15b and the second fixed contact 15c. The first fixed contact 15b is connected to the battery B, and the second fixed contact 15c is connected to GND via the FET 8. The movable contact 15a is connected to the second fixed contact 15c on the GND side when the coil 14 is demagnetized, which is normal, and when the coil 14 is excited based on a command from the controller 6, the first fixed on the battery B side is connected. Connected to the contact 15b.

  Therefore, when the PW switch 5 is lowered, the controller 6 excites the coil 12 based on the operation, and thereby the movable contact 13a of the relay contact 13 is connected to the first fixed contact 13b, while the coil 14 The movable contact 15a of the relay contact 15 maintains the contact state with the second fixed contact 15c by demagnetization. Accordingly, the drive motor 4 rotates in the forward direction, and the window glass 3 is lowered by the driving force during the forward rotation. On the other hand, when the PW switch 5 is moved up, the controller 6 excites the coil 14 based on the operation, whereby the movable contact 15a of the relay contact 15 is connected to the first fixed contact 15b. The movable contact 13a of the relay contact 13 maintains the contact state with the second fixed contact 13c by demagnetization. Therefore, the drive motor 4 rotates in the reverse direction, and the window glass 3 is raised by the driving force during the reverse rotation.

  For example, a MOSFET (Metal-Oxide-Semiconductor FET) is used as the FET 8, the drain terminal is connected to the second fixed contacts 13 c and 15 c of the relay contacts 13 and 15, the source terminal is connected to GND, and the gate terminal is connected It is connected to the controller 6. The FET 8 is turned on when an H level signal is input from the controller 6 at the gate terminal, and is turned off when an L level signal is input from the controller 6. In this example, the FET 8 receives a command from the controller 6, that is, a duty signal (voltage signal having a predetermined duty ratio) Sf at the gate terminal, and switches the on / off state according to the level state of the duty signal Sf.

  The controller 6 controls the rotational speed of the drive motor 4, that is, the descending speed / rising speed of the window glass 3 by changing the duty ratio of the output duty signal Sf. Explaining this, when the drive motor 4 is energized with the battery B, the direct current flowing from the battery B to the drive motor 4 is determined based on the ON time per predetermined period of the FET 8, that is, the duty ratio of the duty signal Sf. . Therefore, the direct current from the battery B flows to the drive motor 4 as a pulse current corresponding to the duty ratio of the duty signal Sf, and the drive motor 4 rotates at a rotation speed based on the duty ratio. For this reason, the controller 6 controls the rotational speed of the drive motor 4, that is, the speed control of the window glass 3, by controlling the duty ratio of the duty signal Sf.

  For example, in the normal state, the controller 6 outputs a duty signal Sf with a duty ratio of 100%, and the FET 8 inputs this duty signal Sf, thereby maintaining the on state as shown in FIG. To do. Therefore, if the drive motor 4 is connected to the battery B in this state, the drive motor 4 is supplied with maximum power. Therefore, when the duty signal Sf having a duty ratio of 100% is output, the drive motor 4 rotates at the maximum rotation speed, and the window glass 3 descends / rises at a high speed. In addition, the normal time in this example is when the window glass 3 is lowered and when the window glass 3 is lifted except when decelerating and at a constant low speed.

  On the other hand, when the rising speed of the window glass 3 is switched to a low speed, the controller 6 outputs a duty signal Sf having a predetermined duty ratio (for example, a duty ratio of 50%), and the FET 8 inputs the duty signal Sf. As shown in FIG. 3B, the on / off state is repeated at predetermined intervals. Therefore, if the drive motor 4 is energized with the battery B in this state, the drive motor 4 is supplied with electric power having a value lower than usual. Therefore, when the duty signal Sf having a predetermined duty ratio is output, the drive motor 4 rotates at a rotation speed slower than usual, and the window glass 3 rises at a low speed.

  The power window device 1 includes a pulse sensor 18 that detects the rotational speed of the drive motor 4. The pulse sensor 18 is connected to the controller 6 via the pulse input circuit 19, and outputs a pulse signal Sx corresponding to the rotational speed (drive number) of the drive motor 4 to the controller 6 via the pulse input circuit 19. The controller 6 counts the input pulse signal Sx and recognizes the current position of the window glass 3 based on the counted number. Further, the controller 6 calculates the rotational speed of the drive motor 4 based on the length of the pulse period of the pulse signal Sx. Further, a diode 20 is connected between the terminals of the relay circuit 7 so that the current flowing through the motor circuit does not decrease even when the frequency becomes high. The pulse sensor 18 corresponds to detection means.

  The controller 6 performs brake control for short-circuiting the relay circuit 7 when the window glass 3 at the time of closing is closed. This brake control is a process of connecting the movable contacts 13a, 15a of the relay contacts 13, 15 to the second fixed contacts 13c, 15c, that is, short-circuiting the movable contacts 13a, 15a to the GND side (see FIG. 4). When the brake control is performed, the drive motor 4 is in a power generation state, an electric braking force is generated in the drive motor 4, the rotational speed of the drive motor 4 is rapidly decreased, and the rising speed of the window glass 3 is rapidly decreased. . As shown in FIG. 5, the controller 6 turns off the FET 8 at least during the brake control period.

  The controller 6 shown in FIGS. 1 and 4 measures the elapsed time t from the start of the brake control using an internal counter or the like, and the preset time K (see FIG. 5) and the elapsed time t stored in the memory 21 in advance. Is always performed at the timing of the elapsed time t. When the controller 6 determines that the elapsed time t is equal to or longer than the set time K, the connection of the movable contact 13a of the relay contact 13 to the second fixed contact 13c remains unchanged, and the movable contact 15a of the relay contact 15 is changed to the first fixed contact. Reconnect to 15b to stop the brake control.

  When the brake control is stopped, the controller 6 performs constant low speed control (PWM control) so as to set the rising speed of the window glass 3 at the closing operation to a low speed state. In this constant low speed control, the relay circuit 7 is relay-connected to the relay state in which the drive motor 4 is reversely rotated (that is, the state shown in FIG. 4), and in this state, a predetermined duty ratio (in this example, the duty ratio is 50%, for example). In this control, the duty signal Sf is output to the FET 8. Therefore, the electric power supplied to the drive motor 4 becomes smaller than usual (that is, before closing), and the window glass 3 rises at a low speed.

  By the way, the window glass 3 descends / rises with a speed based on the duty ratio of the duty signal Sf as a target speed. In this example, the window speed based on the duty ratio of 100% becomes the target speed during the descending operation and during the ascending operation except after closing, and the window speed based on a predetermined duty ratio (50% in this example) during constant low speed control. Becomes the target speed. Therefore, the set time K is set to a value at which the window speed of the window glass 3 after being stopped is likely to become the target speed at the time of the low speed control if the brake control that has been started is stopped at that time. is there.

  During the closing operation of the window glass 3, the controller 6 performs pinching control. This sandwiching control is a control for stopping or reversing the window glass 3 when it is detected that the foreign object is sandwiched between the window glass 3 and the window frame 2a when the window glass 3 is closed. The sandwiching control is not performed in the area where the brake control is performed, but is performed in the areas before and after that, that is, in the normal area where the remaining opening amount Lx does not reach the deceleration start threshold La as shown in FIG. The

  The sandwiching control in this example employs a pulse detection method and is performed based on the pulse signal Sx input from the pulse sensor 18. That is, when the rotational speed of the drive motor 4 is fast, the pulse cycle is short, and when it is slow, the pulse cycle becomes long.

  More specifically, the controller 6 determines the pulse period Ta of the actual pulse that has just been output and the pulse periods T1 to TN-1 of each pulse up to N-1 counts from the currently output pulse. Sum up and divide the sum by N. That is, the controller 6 calculates the average pulse period Tave. (= (T1 +... + TN-1 + Ta) / N). Here, if the pulse period is always constant, the average pulse period Tave. Is also constant. Further, the controller 6 calculates a basic sandwiching threshold Tx (= a × Tave., Where 0 <a <1) by multiplying the average pulse period Tave. Asking. This sandwiching threshold value Tx is a reference value for determining the presence or absence of sandwiching from time to time.

  Then, the controller 6 obtains a period difference value ΔS (= Ta−Tave.) Between the pulse period Ta obtained at that time and the average pulse period Tave. Including the pulse period Ta, and this period difference value ΔS. The sandwiching threshold value Tx obtained at that time is compared. When the controller 6 determines that the period difference value ΔS is larger than the sandwiching threshold value Tx (ΔS> Tx), the controller 6 determines that something is sandwiched and causes the relay circuit 7 to stop or reversely rotate the window glass 3. To drive. On the other hand, when the controller 6 determines that the period difference value ΔS is equal to or smaller than the sandwiching threshold value Tx (ΔS ≦ Tx), it determines that nothing is sandwiched and continues the raising operation of the window glass 3.

Next, the operation of the power window device 1 of this example will be described using the timing chart shown in FIG.
When the PW switch 5 is not operated, the controller 6 connects the movable contacts 13a and 15a of the relay contacts 13 and 15 to the second fixed contacts 13c and 15c, and connects the relay circuit 7 to the GND. Therefore, no current flows through the drive motor 4, and the window glass 3 is stopped. When the PW switch 5 is lowered from this state, the controller 6 moves the movable contact of the relay contact 13 in a state where the movable contact 15a of the relay contact 15 is connected to the second fixed contact 15c as shown in FIG. 13a is connected to the first fixed contact 13b, and then the FET 8 is turned on. Therefore, the maximum current flows from the battery B in the direction of arrow R in FIG. 1 to the drive motor 4, whereby the drive motor 4 rotates forward at a high rotation speed and the window glass 3 descends at a high speed.

  On the other hand, when the PW switch 5 is raised to close the opened window glass 3, the controller 6 calculates the remaining opening Lx of the window glass 3. That is, since the controller 6 constantly calculates the current position of the window glass 3 at that time based on the pulse signal Sx from the pulse sensor 18, the distance from the fully open to fully closed state of the window glass 3 and the current position The remaining opening amount Lx of the window glass 3 is derived based on the above. Then, the controller 6 compares the remaining opening amount Lx of the window glass 3 with the deceleration start threshold La.

  Here, if the controller 6 determines that the remaining opening amount Lx exceeds the deceleration start threshold La (that is, the window glass 3 is not closed), the controller 6 raises the window glass 3 by normal speed control (high speed operation). Therefore, the relay circuit 7 and the FET 8 are controlled. That is, the controller 6 connects the movable contact 13a of the relay contact 13 to the second fixed contact 13c, connects the movable contact 15a of the relay contact 15 to the first fixed contact 15b, and after the relay switching, a duty signal with a duty ratio of 100%. Sf is output to the FET 8 to hold the FET 8 in the ON state. Therefore, the maximum current flows from the battery B in the direction of the arrow S shown in FIG. 4 to the drive motor 4, whereby the drive motor 4 reverses at a high speed and the window glass 3 rises at a high speed. The lowering speed and the rising speed (at high speed) of the window glass 3 may be the same or different.

  During this closing operation, the controller 6 constantly calculates the remaining opening amount Lx of the window glass 3 and continuously compares the remaining opening amount Lx with the deceleration start threshold La. When the controller 6 determines that the remaining opening amount Lx is within the deceleration start threshold La (that is, when the window glass 3 is closed), the controller 6 switches the ascent operation of the window glass 3 to deceleration control (deceleration operation). The relay circuit 7 and the FET 8 are controlled.

  As this deceleration control, the controller 6 first switches the FET 8 to the OFF state as shown in FIG. After switching the FET 8 to the OFF state, the controller 6 performs brake control. That is, after the FET 8 is switched to the OFF state, the movable contact 13a of the relay contact 13 remains connected to the second fixed contact 13c, and the movable contact 15a of the relay contact 15 is connected to the second fixed contact 15c. 7 becomes a short circuit state. Therefore, a braking force is generated by the drive motor 4 operating as a generator, and thereby the rotational speed of the drive motor 4 is rapidly reduced. Therefore, the window speed when the window glass 3 is raised rapidly decreases, and the window glass 3 ascending speed when closing is rapidly lowered.

  The controller 6 measures the elapsed time t from the start of the brake control with an internal counter during the period of the brake control, and sequentially compares the elapsed time t with the set time K. When the elapsed time t becomes equal to or longer than the set time K, the controller 6 keeps the connection between the movable contact 13a of the relay contact 13 and the second fixed contact 13c as it is, and changes the movable contact 15a of the relay contact 15 to the first fixed contact 15b. By reconnecting, the relay contact 15 is returned to the energized side, and the brake control is stopped. As a result, when the FET 8 is turned on and a current is passed through the motor circuit, the drive motor 4 becomes reversible.

  After stopping the brake control, the controller 6 starts constant low speed control (PWM control) to raise the window glass 3 at low speed, and repeatedly turns on the FET 8 at constant intervals. In this example, a duty signal Sf having a predetermined duty ratio (for example, 50%) is output from the controller 6 to the FET 8, and the FET 8 repeats the ON state at the timing of this duty ratio. Therefore, electric power having a lower value than that at the time of high speed (before closing) is supplied to the drive motor 4, the drive motor 4 rotates at a low rotation speed, and the window glass 3 rises at a low speed. Then, when the window glass 3 rising at low speed is fully closed, the reverse rotation of the drive motor 4 is stopped, and the closing operation of the window glass 3 is completed.

  Further, when the PW switch 5 is lifted to open the window glass 3 in the closed state, if the remaining opening amount Lx of the window glass 3 is within the deceleration start threshold La, the controller 6 is constant at the time of switch operation. Implement low-speed control. That is, if the window glass 3 is raised more than when it is closed when the PW switch 5 is raised, the above-described brake control is not performed, and the window glass 3 is controlled at a constant low speed when the switch is operated. The glass 3 is raised slowly.

  Therefore, in this example, when the window glass 3 is closed when the window glass 3 is closed, a brake process for short-circuiting the relay circuit 7 to the GND side is performed before speed control by PWM control. If the relay circuit 7 is short-circuited in this way, the drive motor 4 operates as a generator, and an electric braking force is generated in the drive motor 4. Therefore, the rotational speed of the drive motor 4 is rapidly decreased, and the rising speed of the window glass 3 is rapidly decreased. Therefore, it is possible to quickly reduce the window speed when the window glass 3 is closed, and it is possible to keep the impact when sandwiched low.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) In this example, when the window glass 3 is closed when the window glass 3 is closed, the brake control for short-circuiting the relay circuit 7 to the GND side is performed before speed control by PWM control is performed. Therefore, the rotational speed of the drive motor 4 can be quickly reduced, and the window speed when the window glass 3 is closed can be quickly reduced. Thus, if the window glass 3 decelerates rapidly, the probability of pinching a human body part such as a finger or a hand between the window glass 3 and the window frame 2a is reduced, and the effect of preventing pinching is high. Even if the window glass 3 and the window frame 2a are pinched, if the window glass 3 decelerates quickly, the window glass 3 comes into contact with the human body at a lower speed than usual, and the impact at the time of pinching Can also be reduced.

  (2) When starting the brake control, the FET 8 is first turned off, and then the relay circuit 7 is short-circuited to perform the brake control. Here, for example, assuming that the order in which the brake control is performed first while the FET 8 remains on is to switch the contact of the relay circuit 7 while the current is flowing in the motor circuit of the drive motor 4, the relay contact The problem arises that 15 is easily painful. However, if the FET 8 is turned off prior to the brake control as in this example, the relay contact 15 is switched while no current is flowing in the motor circuit, and the durability of the relay contact 15 is increased. Can be secured.

  (3) When stopping the brake control, the relay contact 15 is first returned to the energized side, and then the FET 8 is turned on and off to perform constant low speed control (ie, PWM control). Here, for example, when the relay contact 15 is returned to the energization side when the FET 8 is in the ON state, a large load is applied to the relay contact 15 when a current flows through the drive motor 4, causing a problem that the relay contact 15 is easily painful. Further, as another problem, when the relay contact 15 is switched, the movable contact 15a of the relay contact 15 vibrates and a sound is generated. However, as in this example, if the relay contact 15 is first returned to the energized side to stop the brake control and then the constant low speed control is performed thereafter, the above problems do not occur, and the durability of the relay contact 15 Performance can be ensured, and sound generation at the time of contact switching can also be prevented.

  (4) In the brake control of this example, both the relay contacts 13 and 15 of the relay circuit 7 are both short-circuited to the GND side (that is, the second fixed contacts 13c and 15c). By the way, on the board on which the controller 6, the relay circuit 7, the FET 8 and the like are mounted, the power supply line is overwhelmingly less than the GND line, so that it extends from the terminal of the drive motor 4 at the time of short circuit. If the lead wire is disconnected, there is a high possibility that the lead wire contacts a predetermined signal line or body ground and is GND-connected. Therefore, for example, when the method of short-circuiting the relay contacts 13 and 15 to the battery B side (that is, the first fixed contacts 13b and 15b) is used, the disconnected lead wire is connected to the GND side and the drive motor 4 is erroneously connected. The possibility of operation increases. However, if the method of short-circuiting the relay circuit 7 with GND connection as in this example is used, the probability that the drive motor 4 will malfunction can be kept low even if the lead wire is disconnected.

  (5) When the window glass 3 is closed, when the foreign object is caught between the window glass 3 and the window frame 2a in the normal area (high speed rising area) and the one-point low speed control area, the window glass 3 is stopped or The sandwiching control for reverse operation is performed. Therefore, it is difficult to generate a situation in which a human body part such as a finger or a hand is sandwiched between the window glass 3 and the window frame 2a.

  (6) PWM control has various effects such as fast response speed, long switch life, low sound during switching, and simple control. In this example, since the PWM control is used for speed control when the rotational speed of the drive motor 4 (the rising speed of the window glass 3) is low, the various effects described above can be obtained.

In addition, this embodiment is not limited to the said structure, You may change into the following aspects.
-The circuit which drives the drive motor 4 is not limited to the structure which combined the relay circuit 7 and FET8. For example, as shown in FIG. 6, four FETs 41 to 44 are combined in a bridge shape, and a diode 45 for preventing reverse connection of the battery B is connected to the upstream side of the bridge circuit. A configuration in which the drive motor 4 is connected to the midpoint of 44 may be used. In order to cause the drive motor 4 to rotate forward (open operation) with this circuit, for example, to turn on the FETs 41 and 44 and pass a current in the direction of the arrow Ia through the motor circuit, and to reverse (close operation) the drive motor 4, For example, the FETs 42 and 43 are turned on to pass a current in the direction of the arrow Ib through the motor circuit. Also, in order to perform brake control in this circuit, the FET 43 is turned off, and in order to perform constant low speed control, the set of FETs 42 and 43 and the set of FETs 41 and 44 are alternately turned on. Do.

  -When performing brake control, it is not limited to the structure which turns off FET8 prior to brake control. That is, the timing at which the brake control is started (that is, the timing at which the relay circuit 7 is short-circuited) and the timing at which the FET 8 is turned off may be simultaneous, or the timing at which the brake control is started first, and then the FET 8 is turned off. It may be the order to do.

  When stopping the brake control, the order is not limited to the order in which the relay circuit 7 is returned to the energized state to stop the brake control first, and then the constant low speed control is performed. That is, the timing for stopping the brake control (that is, the timing for returning the relay circuit 7 to the energization side) and the timing for starting the constant low-speed control may be simultaneous, or the constant low-speed control precedes the brake control stop timing. The order of starting (that is, PWM control) may be used.

When the relay circuit 7 is short-circuited, it is not limited to connecting both the relay contacts 13 and 15 to the GND side, and both the relay contacts 13 and 15 may be connected to the power supply side.
The window speed of the window glass 3 at the normal time is not limited to the speed based on the duty ratio of 100%, and may be a speed value based on 90% or 80%, for example. Similarly, the window speed of the window glass 3 during the constant low speed control is not limited to the duty ratio of 50%, and may be a speed value based on 40% or 30%, for example.

  It is not always necessary to have a constant low speed region from the time when the remaining opening amount Lx of the window glass 3 is within the deceleration start threshold La to the fully closed state, and the entire region may be the deceleration region.

  The speed control for setting the window glass 3 to the low speed state is not limited to the PWM control. For example, the control for changing the rotational speed of the drive motor 4 by turning on and off the relay contacts 13 and 15 of the relay circuit 7 itself may be used. Good.

The pulse sensor 18 is not limited to an optical type or a magnetic type, and any sensor may be used as long as it can detect the rotation speed of the drive motor 4.
-The power window apparatus 1 of this example is not limited to being employ | adopted as the window glass 3 of a vehicle, For example, you may employ | adopt as the window glass of various buildings, such as a house. Moreover, even if it is a vehicle, it shall contain not only a motor vehicle but various vehicles, such as a train and an industrial vehicle, for example.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) When the operating means for raising and lowering is opened, the motor rotates in one direction and the window member is lowered, and when the operating means is closed, the motor rotates in the other direction. In the deceleration control method for a power window device, the motor is controlled at a low speed by moving the window member at a low speed when the window member being lifted is closed when the window member is being lifted. The control circuit inputs a detection signal from a detection means for detecting the current position of the window member by rotating the motor in the one direction or the other direction by switching the current direction of the current flowing through the control circuit. A power window device deceleration control method comprising: short-circuiting the relay circuit when the circuit determines that the window member during the closing operation has been closed based on the detection signal.

The circuit diagram which shows the electric constitution of the power window apparatus in one Embodiment. The side view of the side door of a vehicle. (A), (b) is a wave form diagram which shows the on-off state of FET. The circuit diagram which shows the operation state of a power window apparatus. The timing chart which shows the operation state of a relay circuit, FET, and window speed. The circuit diagram of the circuit which drives the drive motor in another example. The circuit diagram which shows the electric constitution of the conventional power window apparatus. The timing chart which shows the operation state of a relay circuit, FET, and window speed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Power window apparatus, 3 ... Window glass as window member, 4 ... Drive motor as motor, 5 ... PW switch as operation means, 6 ... Controller which comprises control circuit and speed control circuit, 7 ... Relay circuit, 8 ... FET as a switching element, 13, 15 ... Relay contact, 18 ... Pulse sensor as detection means, Sf ... Duty signal, t ... Elapsed time, K ... Setting time.

Claims (4)

When the operating means for raising and lowering is opened, the motor rotates in one direction and the window member is lowered. When the operating means is closed, the motor rotates in the other direction and the window member is raised. When the window member that is being lifted during the closing operation of the window member is closed, the power window device that performs speed control on the motor to raise the window member at a low speed,
A relay circuit for rotating the motor in the one direction or the other direction by switching a current direction of a current flowing through the motor;
A control circuit for inputting a detection signal from a detection means for detecting the current position of the window member, and short-circuiting the relay circuit when it is determined that the window member during the closing operation has been closed based on the detection signal. And a power window device. A switching element connected to the motor circuit of the motor;
A speed control circuit that outputs a duty signal to the switching element and turns the switching element at a duty ratio of the duty signal to raise the window member at a low speed;
2. The power according to claim 1, wherein the control circuit turns off the switching element and then short-circuits the relay circuit when the window member during a closing operation is closed. Window device.   The control circuit counts an elapsed time after the relay circuit is short-circuited, and when the elapsed time becomes equal to or longer than a set time, the control circuit returns the relay circuit to an energized state to release the short-circuit, and then The power window device according to claim 2, wherein the window member is raised at the low speed by the speed control circuit.   The relay circuit includes two relay contacts connected to each of the one side terminal and the other side terminal of the motor, and the control circuit is a process of connecting both the relay contacts to the GND side as the short-circuit process. The power window device according to any one of claims 1 to 3, wherein:

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