JP2577092Y2 - Window glass lifting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window glass elevating device, and more particularly to a window glass elevating device suitable for opening and closing a window glass (side glass) of a side door of an automobile.

[0002]

2. Description of the Related Art Conventionally, an elevator for raising and lowering a window glass (side glass) of a side door of an automobile, for example, guides the window glass freely up and down by a guide rail, and raises and lowers the window glass by forward and reverse driving force of an electric motor. It is configured to be.

[0003]

However, the above-mentioned conventional lifting device raises and lowers the window glass simply by changing the direction of application of a prescribed drive voltage and rotating the electric motor forward or backward. There were the following problems in each of the elevating positions.

[0004] When the window glass starts to move up and down, the electric motor suddenly generates a specified torque, so that an impact force is applied to the window glass, which does not smoothly start moving up and down.
It was difficult to raise and lower it slightly to fine-tune the position of the window glass. Also, especially when the window glass is at the fully-closed ascending limit position, the window glass and the door weatherstrip are in close contact with each other. At the moment of leaving the weatherstrip, the descent resistance of the windowpane suddenly decreases, which may temporarily drop and emit an unpleasant impact sound.

When the lowering of the window glass is mechanically restrained by the stopper when the window glass is lowered to the lower limit position of the fully opened state, an excessive amount of wire or the like provided in the drive system of the window glass is generated by the specified torque of the electric motor. Strong impact force, and the durability may be impaired.

[0006] When the windowpane is moved up to the fully closed ascending limit position, the windowpane is closed off by the specified torque of the electric motor, and an unpleasant impact may occur at that moment.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for raising and lowering a window glass capable of optimally controlling an electric motor for driving the window glass in accordance with the state of lifting and lowering of the window glass. Is to do.

[0008]

A first embodiment of a window glass raising and lowering device according to the present invention is a window glass raising and lowering device capable of raising and lowering a window glass by a driving force of an electric motor. Speed detecting means for detecting, and at the start of elevating the window glass, first apply a constant start-up voltage to the electric motor for a predetermined time, and then set the elevating speed of the window glass detected by the speed detecting means to a predetermined value. Control means for starting up and down which controls the speed of the electric motor so as to achieve the acceleration target speed.

A second embodiment of the window glass raising and lowering device according to the present invention is a window glass raising and lowering device capable of raising and lowering a window glass by a driving force of an electric motor, wherein the electric motor is driven during the lowering operation of the window glass. A position detection unit that sets a position immediately before the descent limit at which the windowpane descends to the descent limit position even when stopped, and a position detection unit that detects that the windowpane has been lowered to the position immediately before the descent limit, and the window by the position detection unit. When the glass is detected to have fallen to the position immediately before the descent limit, control means for a descent timing for stopping application of a drive voltage to the electric motor is provided.

A third aspect of the window glass elevating device according to the present invention is a window glass elevating device capable of elevating the window glass by a driving force of an electric motor. Position detecting means, and control for rising timing for continuously applying a maximum drive voltage to the electric motor for a predetermined time when the position detecting means detects that the window glass has risen to the ascending limit position. Means.

[0011]

The apparatus for raising and lowering a window glass according to the present invention is designed to gradually increase the drive voltage of an electric motor for driving the window glass or to gradually increase the speed of raising and lowering the window glass at the start of the raising and lowering of the window glass. By controlling the driving voltage, it is possible to start the ascending and descending of the window glass smoothly.

Further, by controlling the drive voltage of the electric motor for driving the window glass in accordance with the position where the window glass is raised and lowered, it is possible to optimally control the electric motor in accordance with the position where the window glass is raised and lowered.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. This embodiment is an example of application as an elevating device for a window glass (side glass) of a side door of an automobile.

FIG. 1 is a schematic side view of a side door 1 of an automobile provided with a lifting device 10 according to this embodiment.
0 is provided with a drive mechanism 20 that moves the carrier 3 attached to the window glass 2 up and down along the guide rails 4. The drive mechanism 20 of the present embodiment moves the wire 21 connected to the carrier 3 in the directions of arrows A ₁ and A _{2 by} forward and reverse rotation of the electric motor 22 (see FIG. 2), so that the window glass 2 moves up and down together with the carrier 3. It is configured to be. The electric motor 22 is provided with a rotation sensor 23 (see FIG. 2) that outputs a pulse signal according to the number of rotations. In addition, a switch operation unit 24 for raising and lowering the window glass 2 is provided inside the side door 1. The electric motor 22, the rotation sensor 23, and the switch operation unit 24 are connected to a control device (control means) 30.

In FIG. 2, reference numeral 31 denotes a voltage converter constituting a power supply circuit of the control device 30 and is connected to a power supply (vehicle battery) 32. Reference numeral 33 denotes an arithmetic processing unit (CPU) for executing control processing, data processing, and the like of each unit of the control device 30; 34, a storage unit (RAM, ROM) for storing the processing procedure and the like and used as a work area;
An interrupt request unit 35 issues an interrupt request at a predetermined timing. 36 is a drive voltage control unit that controls the drive voltage of the motor 22, and 37 is a forward / reverse control unit that controls the direction of application of the drive voltage to forward or reverse the motor 22. Reference numeral 38 denotes a cycle calculating unit which calculates the output cycle of the pulse signal from the rotation sensor 23 and outputs a detection signal (hereinafter, referred to as a “speed signal”) S ₁ of the rotation speed of the motor 22 corresponding thereto. Is the rotation sensor 2
3 is counted and the corresponding window glass 2 is counted.
Is a position counter (position detecting means) for obtaining the ascending / descending position. The function of each unit in the control device 30 will be described in detail together with the operation.

Next, the operation will be described.

In the present embodiment, as shown in FIG. 1, seven elevation positions (P _{0 to} P ₆ ) of the window glass 2 are set. P ₀ is an ascending limit position where the window glass 2 is fully closed,
P ₁ and P ₂ are set at positions lower than that.
P ₆ is a lower limit position where the window glass 2 is fully opened, and P ₅ , P ₄ , and P ₃ are set above the lower limit position. Then, as shown in FIG. 3, when the window glass 2 descends, it is time between P ₀ of P ₃ is selected the control mode 1 to be described later, when it is between P ₃ of P ₆ The control mode 2 described later is selected. On the other hand, when increasing the window glass 2 is that it control mode 1 when between P ₆ of P ₂
There is selected, it is the control mode 3 to be described later is selected when between P ₂ of P _0.

The arithmetic processing section 33 of the control device 30 is shown in FIG.
The main routine of FIGS. 5 and 6 is executed.

A "Initial setting" A-1 "Reset operation of count value C" Steps S1 to S10 in FIG. 4 are for initial setting for resetting the count value C of the counter 39 (see FIG. 2) to "0". This is the process. First, in steps S1 and S2, S
The subroutine of the W mode 1 or 2 is executed.

As shown in FIG. 7, the subroutine of the SW mode 1 is a "DOWN signal" for lowering the window glass 2 from the switch operation unit 24 (see FIGS. 1 and 2) or for raising the same. (Steps S51 and S52), and when these signals are input, it is determined whether or not there is an operation command of an automatic function for automatically lowering or raising the window glass 2 continuously. A determination is made (steps S53 and S54). If there is no operation command, a "DOWN relay" or an "UP relay" is activated (steps S55 and S56). If there is an operation command, an auto flag is set (steps S57 and S56). After S58), the “DOWN relay” or the “UP relay” is activated. The DOWN relay and the UP relay are provided in the forward / reverse control unit 37 (see FIG. 2). When the former operates, the motor 22 rotates in a direction to lower the window glass 2, and the latter operates. As a result, the motor 22 rotates in a direction to raise the window glass 2.

As shown in FIG. 8, the subroutine of the SW mode 2 is based on the condition that the UP signal is not inputted when the auto flag is not set during the operation of the UP relay (steps S61, S62, S63). And when the auto flag is set, the reverse DOWN
The condition that the signal is input (steps S61 and S6)
(2, S64), stop of the UP relay (step S6)
5) and resetting the auto flag (step S66), and then counting the count value C of the counter 39 (see FIG. 2) to C
Stored as _A (step S67). On the other hand, DOWN
When the auto flag is not set during the operation of the relay, the condition is that the DOWN signal is not input (steps S61, S68, S69). When the auto flag is set, the reverse UP signal is output. Assuming that the input has been made (S61, S68, S70),
Stopping the DOWN relay after a (step S71) and auto flag reset (step S72), and stores the count value C of the counter 39 (see FIG. 2) as the C _A (step S73).

Referring back to FIG. 4, in the next step S3,
The operation of the switch operation unit 24 (for example, D
On the condition that an OWN signal or an UP signal is input), the speed signal S ₁ of the period calculating unit 38 (see FIG. 2) is used.
From the window glass 2 is read (step S).
4). Then, the process returns to the previous step S2, when the window glass 2 is in the lift (S ≠ 0), when it is stopped (S = 0), SW after starting the timer T ₁ (step S6)
The mode 2 subroutine is executed (step S7).
Thereafter, it is again determined whether or not the switch operation unit 24 has been operated. If the switch operation unit 24 has not been operated, the process returns to step S1. If it has been operated, the timer T ₁ has been operated.
, The count value C of the counter 39 (see FIG. 2) is reset to "0" (step S1).
0).

Eventually, in steps S1 to S10 in FIG. 4, the window glass 2 is raised or lowered to the position where it stops, and the count value C at that time is reset to "0".

A-2 "Setting of maximum count value C _MAX " Steps S11 to S22 of FIG.
_This is a process for initial setting for setting _MAX .

Steps S11 to S19 are the same as those in FIG.
Steps S1 to S9 are the same. Then, in the next step S20, the count value C of the counter 39 is read, and
Its absolute value is returned to the previous step S11 from step S21 when less than the reference value A, when the absolute value thereof is larger than the reference value A is set to the count value C as the maximum value C _MAX (step S21, S22). Reference value A
The window glass 2 is slightly smaller value count value counter 39 counts, or it from even when the movement distance worth between the raised limit position P ₀ and a lowered limit position P _6.

After all, in steps S11 to S22 of FIG. 5, when the window glass 2 is at the lowered position at the time of the previous step S10 (see FIG. 4), the window glass 2 is raised until it stops, and on the other hand, Window glass 2 at step S10
There when in the raised position, it is lowered until it stops, will set the count value C in the case of them as C _MAX.

B "Normal Control" In the processing of FIG. 6, the above-described three control modes 1, 2, or 3 (see FIG. 3) are selected in accordance with the position of the window glass 2 to move up and down. The subroutine 1, 2, or 3, which will be described later, is executed. In the following, as shown in FIG. 3, the count value C of the counter 39 when the window glass 2 moves to the ascending limit position P ₀ is represented by C ₀ (=
0), C ₁ ~C ₆ the count value C when the count value C C ₆ and (= C _MAX), each likewise position P ₁ to P ₅ when it is moved to the lowered limit position P ₆ And

Firstly, after performing the subroutine of SW mode 1 (step S23), when inputting a DOWN signal, i.e. when the window glass 2 is lowered, the count value C is less than C _3, the control Mode 1 is selected and its subroutine is executed (steps S24, S25, S2
6) The count value C is equal to C ₃ or higher, to perform its subroutine selects the control mode 2 (step S24, S25, S27). Meanwhile, when inputting the UP signal, i.e. when the window glass is raised, if the count value C is long beyond the C _2, and selecting the control mode 1 executes the subroutine (step S24, S28, S
26) The count value C is equal to C ₂ or less, and executes the subroutine selects the control mode 3 (step S24, S28, S29).

As will be described later, the motor 22 is controlled by the control mode 1 subroutine executed in step S26.
After driving voltage (see FIG. 2) is the largest V _MAX, that the switch operation unit 24 is operated subsequently condition (step S30), and executes the subroutine of the SW mode 2 (step S31). Switch operation unit 24
If is no longer operated, the process returns to step S23. Thereafter, when it is further DOWN signal input by continued operation of the switch operation unit 24, i.e. when the window glass 2 to continue the descent until the count value C is C ₃ or more, returns to the previous step S31 To maintain the drive voltage of the motor 22 at V _MAX (steps S31, S32, S32).
33, S34), and when the count value C becomes C ₃ or more, and executes the subroutine instead the control mode to select the control mode 1 (step S35). On the other hand, when the switch operation unit 24 is continuously operated, the UP
When the signal is being input, that is, when the window glass 2 continues to rise, the count value C is reduced to C ₂ or less.
Returning to step S31, the drive voltage of the motor 22 is set to V
_MAX (steps S31, S32, S33, S3
6), and when the count value becomes a C ₂ or less, and executes the subroutine instead the control mode to select the control mode 3 (step S37).

After all, as shown in FIG. 3, when the window glass 2 is lowered, the control mode 1 is selected in the range of C <C ₃ , and the control mode 2 is selected in the range of C ≧ C _3. 2, when control mode 1 and C are in the range of C> C ₂
In the range of ≦ C ₂ , the control mode 3 is selected.

Next, the subroutines of the control modes 1, 2, 3 will be described.

(Control Mode 1) FIG. 9 shows a subroutine of control mode 1, and FIG. 10 shows changes in the driving voltage V of the motor 22 and the moving speed S of the window glass 2 when the subroutine is executed.

[0033] First, in step S81 in FIG. 9, to set the drive voltage V of the motor 22 to a predetermined starting voltage V _1, activates the motor 22 by the activation voltage V _1. Then, after activating the timer T ₂ (step S 82), S
Subroutine is executed W mode 2 (step S83) and then, on the condition that the UP relay or DOWN relay is continued operation (step S84), steps S85 until the timer T ₂ times out up to the previous step S83 Return. Accordingly, as shown in FIG. 10, t ₂ hours after starting the motor 22 the timer T ₂ has timed up (e.g., 10 msec) until passage, so that the activation voltages V ₁ to the motor 22 is applied .

Thereafter, after the timer T ₂ has timed out, the difference C _B (= C _B ) between the count value C _A of the counter 39 when the motor 22 is started (see FIG. 8) and the current count value C of the counter 39 Until | C−C _A |) reaches the predetermined count value B, that is, until the window glass 2 moves by a distance corresponding to the predetermined count value B, the predetermined speed S
The drive voltage V of the motor 22 is controlled using ₁ as the target speed of the window glass 2. That is, step S86, S87 from the flow proceeds to step S88, the difference from the set speed S ₁ as the target speed S _A, and its target speed S _A and the moving speed S of the current window glass 2 [Delta] S, and the difference A correction voltage ΔV (= a · ΔS) corresponding to ΔS is obtained (step S8).
9, S90), corrects the current drive voltage V by the voltage ΔV, drives the motor 22 with the new drive voltage V (step S91), and proceeds to step S82.
Return to Therefore, as shown in FIG.
During the timer T ₂ are each t ₂ interval times out, the sequentially corrects the driving voltage V of the moving speed S of the window glass 2 such that the target speed S ₁ but to move by a distance corresponding to the count value B Will be.

If the window glass 2 has moved beyond the distance corresponding to the count value B, the process proceeds from step S87 to step S87.
Proceeds to 92, the driving voltage V is to reach the maximum voltage V _MAX, stepwise increasing the driving voltage V by a predetermined voltage [Delta] V _C (step S92~S97). That is, first, the electric voltage V is increased by ΔV _C (step S9).
2), that the electric voltage V does not reach the maximum voltage V _MAX condition (step S93), starts the timer T ₂ (step S94), and executes the subroutine of the SW mode 2 (step S95), further, uP relay or DOWN relay continues operating and on condition that the timer T ₂ has timed (step S96, S9
The process returns to step S92 as 7). in this way,
By gradually increasing the drive voltage V by a predetermined voltage ΔV _C , the moving speed S of the window glass 2 gradually increases as shown in FIG. Therefore, the operation of slightly opening and closing the window glass 2 becomes easy.

(Control Mode 2) FIG. 11 shows a subroutine of control mode 2, and FIG. 12 shows a change in drive voltage V when the subroutine is executed.

In this control mode 2, the window glass 2 is moved to the position P
When descending within the range of ₃ or less, the driving voltage V is changed according to the descending position of the window glass 2. That is, first,
Count value C is equal to or less than C ₄ (step S101), it is when less than C _4, and executes the subroutine of the SW mode 2 driving voltage V from a predetermined voltage V ₂ (step (S102, S103), and returns to the previous step S101 on condition that the switch operation unit 24 is continuously operated (step S104). When the count value C is a C ₄ or higher, the driving voltage V of a predetermined voltage V ₃ executes a subroutine of SW mode 2 after the (<V ₂₎ (step S105, S106), and the switch operation unit 24 continues operating is and the condition that the count value C is less than C ₅ (step S10
7, S108), and returns to the previous step S106. When the count value C is C ₅ or more, it stops the operation of the DOWN relay (step S109), and resets the auto flag (step S110).

As a result, as shown in FIG. 12A, the drive voltage V gradually decreases to V ₂ and V ₃ in accordance with the lowered position of the window glass 2, and the position in front of the lower limit position P _6. P
_{At 5, the} drive voltage V becomes "0". Window glass 2 is lowered from the position P ₅ by its own weight or the like to the lowered limit position P _6. FIG. 4B shows a state where the window glass 2 starts descending from the range of C ₃ ≦ C <C ₄ , and FIG. 4C shows a state where the window glass 2 starts from the position of C ₄ ≦ C <C ₅ . This shows the state when the descent is started.

(Control Mode 3) FIG. 13 shows a subroutine of the control mode 3, and FIG. 14, FIG. 15, and FIG. 16 show changes in the drive voltage V of the motor 22 and the rising speed S of the window glass 2 when the subroutine is executed. Shown in

First, the drive voltage V is set to V ₄ or V ₅ (<V ₄ ) according to the rising start position of the window glass 2. That is, FIG. 14, C ≦ C as the V _4, Figure 16 is a driving voltage V when rising from a range of C> C ₁ as shown in FIG. 15
When the increase from ₁ range and V ₅ a drive voltage V (step S121, S122, S123), and starts the timer T ₂ (step S124), and SW mode 2
Run the subroutine (step S125), further, a condition that the switch operation unit 24 is operated subsequently and timer T ₂ is before time-up (step S1
26, S127), and returns to the previous step S125. Therefore, the driving voltage V is maintained at V ₄ or V ₅ by t ₂ hours.

After that, according to the rising position of the window glass 2,
Set the target speed S _A of the window glass 2 to S ₂ or S ₃ (<S ₂ )
Set to. That is, the target speed S _A when the range of C> C ₁ is set to S _2, when the range of C ≦ C ₁ sets the target speed S _A to S ₃ (step S128, S12
9, S130). The condition that the moving speed (elevation speed) S of the window glass 2 is not “0”, that is, the window glass 2 has not reached the elevation limit position P ₀ (step S13)
As 1), a difference ΔS between the target speed S _A and the current moving speed S of the window glass 2 and a correction voltage ΔV (= a · ΔS) corresponding to the difference ΔS are obtained (steps S132 and S1).
33) Then, the current drive voltage V is corrected by the voltage ΔV, the motor 22 is driven using the corrected drive voltage V as a new drive voltage V (step S134), and the process returns to the previous step S124. Therefore, as shown in FIG.
When the range of C _1, t the timer T ₂ is the time is up
_At every _two intervals, the drive voltage V is sequentially corrected so that the moving speed (rising speed) S of the window glass becomes the target speed S _2, and
When the window glass 2 is in the range of C ≦ C ₁ , every t ₂ interval,
The moving speed S will be sequentially correcting the drive voltage V to the target speed S _3.

When the window glass 2 has risen to the rising limit position P ₀ and the speed S has become “0”, after the STOP flag is set (step S 136) and the timer T ₃ is started (step S 137), Proceed to step S132. After setting the STOP flag in this manner, step S
Proceeds from 135 to a step S138, S132, until the timer T ₃ is the time is up, as with the move of the window glass 2 described above (increased), sequentially corrects the driving voltage V so as to the speed S and the target speed S ₃ . Here, the speed S is “0”
Therefore, the drive voltage V naturally rises sharply to the maximum V _MAX, and the window glass 2 is strongly closed until the time t ₃ (for example, 100 msec) when the timer T ₃ times out (FIG. 14). , FIG. 15, FIG. 16). Therefore, the rising speed of the window glass 2 is reduced without lowering the closing force of the window glass 2, and an obstacle between the upper end of the window glass 2 and the window frame is reduced by lowering the rising speed. This also prevents pinching.

After the elapse of the time t ₃ , the UP relay is stopped (step S139), the STOP flag is reset (step S140), and the count value C is reset (step S141).

[0044]

As described above, the apparatus for raising and lowering window glass of the present invention applies a constant starting voltage to the electric motor for a predetermined time at the start of raising and lowering the window glass, and then raises and lowers the window glass. By controlling the speed of the electric motor so that the speed is set to the predetermined acceleration target speed, the window glass is reliably started (starting up and down) by a sufficient starting voltage, and then the window glass is quickly raised and lowered by the acceleration target speed. be able to.

The window glass lifting and lowering device of the present invention is as follows.
When the window glass has descended to the position immediately before the predetermined lower limit position immediately before the lower limit position, the application of the drive voltage of the electric motor is stopped to lower the window glass to the lower limit position by the weight of the window glass. The impact at the time of full opening can be suppressed small. In addition, the window glass elevating device of the present invention, when the window glass is raised to the upper limit position,
By continuously applying the maximum drive voltage to the electric motor for a predetermined time, a sufficient closing force of the window glass can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic structural view of a side door of an automobile provided with an embodiment of the present invention.

FIG. 2 is a block diagram of the control device shown in FIG. 1;

FIG. 3 is an explanatory diagram of types of control modes in the control device shown in FIG. 2;

FIG. 4 is a flowchart illustrating a part of an initial setting operation performed by the control device illustrated in FIG. 2;

FIG. 5 is a flowchart for explaining another part of the initial setting operation by the control device shown in FIG. 2;

FIG. 6 is a flowchart for explaining normal control by the control device shown in FIG. 2;

FIG. 7 is a flowchart for explaining a subroutine of SW mode 1 shown in FIG. 4;

FIG. 8 is a flowchart illustrating a subroutine of SW mode 2 shown in FIG. 4;

FIG. 9 is a flowchart illustrating a subroutine of control mode 1 shown in FIG. 6;

FIG. 10 is an explanatory diagram of a control example according to control mode 1 shown in FIG.

11 is a flowchart illustrating a subroutine of control mode 2 shown in FIG.

FIG. 12 is an explanatory diagram of a control example according to control mode 2 shown in FIG. 6;

FIG. 13 is a flowchart illustrating a subroutine of control mode 3 shown in FIG. 6;

FIG. 14 is an explanatory diagram of a control example according to a control mode 3 shown in FIG. 6;

FIG. 15 is an explanatory diagram of another control example according to control mode 3 shown in FIG. 6;

FIG. 16 is an explanatory diagram of still another control example according to control mode 3 shown in FIG. 6;

[Explanation of symbols]

2 Window glass 10 Lifting device 20 Drive mechanism 22 Electric motor 23 Rotation sensor 30 Control device (Control means) 39 Position counter (Position detecting means) P ₀ Ascending limit position P ₆ Ascending limit position

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-280475 (JP, A) JP-A-2-147786 (JP, A) JP-A-58-37276 (JP, A) JP-A-7- 18947 (JP, A) JP-A-63-118484 (JP, A) JP-A-63-104583 (JP, U) JP-A-63-76184 (JP, U) JP-A-55-176971 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E05F 15/00-15/20

Claims (6)

(57) [Scope of request for utility model registration] 1. A window glass elevating device capable of elevating and lowering a window glass by a driving force of an electric motor, comprising: a speed detecting means for detecting an elevating speed of the window glass; A control for starting up and down, which controls the speed of the electric motor such that a predetermined start-up voltage is applied to the electric motor, and then the moving speed of the window glass detected by the speed detecting means is set to a predetermined acceleration target speed. Means for raising and lowering the window glass. 2. The control means for starting up and down starts applying a constant start-up voltage of the electric motor for a predetermined time at the start of raising and lowering of the window glass, and then only during a period when the window glass moves up and down a predetermined distance. Controlling the speed of the electric motor so that the vertical movement speed of the window glass detected by the speed detecting means is equal to a predetermined acceleration target speed, and thereafter increasing the drive voltage of the electric motor stepwise. The window glass lifting and lowering device according to claim 1. 3. A window glass elevating device capable of moving up and down a window glass by a driving force of an electric motor, wherein the window glass is moved to a lower limit position even when the driving of the electric motor is stopped during the lowering operation of the window glass. Setting a position immediately before the descent limit to be lowered, position detection means for detecting that the window glass has been lowered to the position immediately before the descent limit, and that the window glass has been lowered to the position immediately before the descent limit by the position detection means. A window timing elevating device, comprising: a descent timing control means for stopping application of a drive voltage to the electric motor when detected. 4. The control means for lowering timing lowers the drive voltage of the electric motor stepwise to a predetermined voltage before the window glass lowers to the position immediately before the lowering limit. The window glass lifting and lowering device according to claim 3. 5. A window glass elevating and lowering device capable of elevating and lowering a window glass by a driving force of an electric motor, wherein: a position detecting means for detecting that the window glass has risen to an upper limit position; A window glass, comprising: a rising time control means for continuously applying a maximum drive voltage to the electric motor for a predetermined time when it is detected that the glass has risen to the rising limit position. Lifting equipment. 6. The speed detecting means for detecting a rising speed of the window glass, and the control means for rising timing are detected by the speed detecting means before the window glass rises to the upper limit position. The window glass raising / lowering device according to claim 5, wherein the speed of the electric motor is controlled so that the window glass raising speed is set to a predetermined deceleration target speed.