JPH0412356B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical field] The present invention relates to an automatic opening/closing method that opens and closes transparent plates, opaque plates, panels, etc. (hereinafter referred to as opening covering materials or panels) for closing openings such as windows, doorways, roof openings, etc. in response to switch operations. The present invention relates to devices, particularly, but not exclusively, to automatic opening/closing devices for side windows and sunroofs of automobiles. [Prior Art] For example, an automobile sunroof is equipped with an automatic opening/closing device that tilts and/or slides the sunroof (roof panel) open/close in response to a driver's switch operation. Conventionally, a drive control device for a vehicle sunroof detects a motor load using a motor temperature detection resistor, compares this with an overload reference value, and automatically stops the motor when an overload occurs. In a mechanism with a constant load, such a safety stop can be accomplished relatively easily. However, with the above-mentioned sunroof mechanism, when the sunroof is opened, the load is large until the front end of the slide panel leaves the weather strip, and then decreases when the sunroof leaves, and when the sunroof is closed, the load is raised by raising the link to lift the rear end of the slide panel. Furthermore, the load suddenly increases after the front end of the slide panel comes into contact with the weather strip, and if a deflector arm is provided, the load increases when the deflector arm is pressed down, resulting in a significant load even during normal operation. It fluctuates. To prevent malfunctions even under such load fluctuations,
In the invention disclosed in Japanese Patent Publication No. 1-37291, a tolerance range is added to a motor load detection value and the result is stored in memory at a predetermined timing, and a tolerance range is added to the motor load detection value to delay it, and the motor detection value is stored as a memory value. and the delay value, and when the detected value exceeds one of the detected values, the motor is stopped. In such an overload detection protection device, when the motor load fluctuates up and down even under normal conditions, the delay value, which is the sum of the tolerance and the delay value, is still low when the detected value is high, and when the detected value is low. It was found that when the detected value is high, the detection sensitivity is high, but when the detected value is low, the detection sensitivity is quite low, and when the detected value fluctuates, the sensitivity becomes unstable. In order to improve the problem of this value,
In the invention described in Publication No. 159683, the delay circuit delays the rise of the detection load but does not delay the fall of the detection load. When using this kind of analog delay circuit, the delay time constant is fixed, so that even in the event of an overload, for example, if the closing of the sunroof is obstructed by a relatively hard obstacle, the delay time constant shown in FIG. If the load increases rapidly, the load (motor current) reaches the overload detection reference value level at a relatively early point, and overload is detected, and the overload is detected with a relatively small amount of load fluctuation. will be detected, but
For example, when the closing of the sunroof is obstructed by a relatively soft obstacle, as shown in Fig. 17a, since the load increases gradually, the overload is detected at a late point after the load rises, and the Overload will be detected when the amount of load fluctuation is large. This means that the amount of load variation that is detected as "overload" varies depending on the hardness of the obstacle, so no matter what kind of overload it is, it is not possible to detect an overload at a predetermined amount of load variation. For our purposes, it's not enough. [Object of the Invention] An object of the present invention is to perform a constant overload protection stop that always stops the motor drive at a predetermined amount of overload, regardless of the hardness of the obstacle. [Summary of the invention] In order to achieve the above object, the present invention includes:
An electric drive mechanism that includes an electric motor and an opening/closing mechanism that drives the opening/closing member to open or close in accordance with the forward/reverse rotation of the electric motor; means for detecting the load of the opening/closing mechanism; a motor driver that energizes the electric motor in the forward/reverse rotation; opening/closing material An open/close instruction switch means that instructs the electric motor to open or close; and an overload control device that instructs the motor driver to forward, reverse, or stop the electric motor according to the operation of the open/close instruction switch means, and detects an overload. In an automatic opening/closing device for opening/closing material, the opening/closing control means instructs the motor driver to stop the electric motor when the electric motor is detected. Then, the overload reference value Vr=Va+a・ΔL is set, and then the rate of change Ks of the detected load Vs is detected by referring to the detected load Vs of the load detection means, and when the detected load increases, the rate of change Ks is set. Change the overload reference value Vr by the rate of change Kr = b・Ks multiplied by b,
When the detected load Vs exceeds the overload reference value Vr, it is assumed that the motor is overloaded and the motor driver is instructed to stop the electric motor. In this, a: a coefficient of 0 or more and 1 or less, b: a coefficient of (1-a), and ΔL: an allowable value. According to this, when the load increases at Vs=Va+Ks・t, where t is the elapsed time from the predetermined point, regardless of the magnitude of the change rate Ks, the change rate Ks
Overload reference value at a rate of change of a fraction of Kr = b・Ks
Vr increases, that is, Vr=Va+a・ΔL+b・Ks・t, and Vs≧Vr, that is, Va+Ks・t ≧Va+a・ΔL+b・Ks・t, t is the elapsed time, where b=1− Since a, Va+Ks・t ≧Va+a・ΔL+Ks・ta・Ks・t, Therefore, 0≧a・ΔL−a・Ks・t, that is, Ks・t≧ΔL, Ks・t is the value of the above predetermined point. When the amount of load variation from the load detection value Va is: In other words, when the load increases by more than the allowable value ΔL from the load Va at the predetermined point, "overload" is detected. Therefore, the initial value Va of the overload reference value is
By setting the load to be detected when the motor starts and the inrush current of the motor subsides and the motor current stabilizes to the sunroof drive current, and by setting the allowable value ΔL to the allowable range during normal operation, it is possible to detect obstacles that prevent sunroof movement. Regardless of the hardness of the object, that is, regardless of the rate of change of the detected load, a constant overload Va +
Overload will be detected at ΔL. The motor load not only increases but also decreases, and may increase or decrease within the allowable range ΔL. Therefore, in a preferred embodiment of the present invention, when the detected load Vs decreases while the motor is driving, Vr - load detected value Vs<a・ΔL, that is, the detected load value Vs is a value relatively close to the overload reference value Vr. When , the rate of change Kr of the overload reference value Vr is the previous value. In other words, the rate of change Kr is not updated. When the detected load Vs decreases while the motor is driving, and Vr - load detected value Vs ≧a・ΔL, that is, when the load detected value Vs decreases more than the overload reference value Vr, the load change rate Kr of the overload reference value Vr is the rate of change of the load detection value Vs at that time
Update to Ks. According to this, when the load detection value Vs decreases,
During Vr-Vs<a・ΔL, the rate of change Kr of the overload reference value Vr is maintained at the rate of change Kr just before the load decreases (Ks=0), but Vr−Vs≧a・ΔL
When the change rate Kr of the overload reference value Vr is updated to Ks (change rate Ks of the load detection value Vs at that time: negative value), the overload reference value Vr becomes the change rate of the load detection value Vs.
It decreases at the same rate of change as Ks. That is, the overload reference value Vr decreases with a deviation of about a·ΔL from the load detection value Vs. In this way, when the load detection value Vs decreases, the overload reference value Vr is updated to a value approximately a·ΔL higher than the load detection value Vs. Next, the load detection value Vs increases at a certain value Va (Ks>
0), the rate of change Kr of the overload reference value Vr becomes
The rate of change Kr=a·Ks is updated by multiplying the rate of change Ks (positive value) of the load detection value Vs by a. When the load detection value Vs continues to rise and becomes Vr - Vs = 0, that is, when the load detection value Vs increases by ΔL from the load detection value Va when it starts to rise,
"Overload" will be detected. The changes in the detected load Vs (motor current) and overload reference value Vr (reference level) are shown in Section 17b.
As shown in the figure. In a preferred embodiment of the present invention, which will be described later, a=b=1/2. Further, in a preferred embodiment of the present invention, the electric drive mechanism includes an electric motor and an opening/closing mechanism that tilts and slides the opening covering member according to the forward and reverse rotation of the electric motor, that is, the sunroof panel. A disk that is connected to an electric drive mechanism, rotates in conjunction with the rotation of the electric motor, and has two stages of unevenness for operating the switch on its circumferential surface. a first switch which is arranged opposite to one of the projections and depressions for operating the switch and is driven to open and close by the projections and depressions; It shall be equipped with a signal generating means consisting of a second driven switch, and shall indicate four categories of open and closed modes by the open and close signals of these switches; When the mode indicated by the generation signals of the first and second switches changes from a mode different from open to one indicating open, that is, at a predetermined distance before fully closing, the electric motor is temporarily stopped. The motor driver is instructed to close the opening covering material after a temporary stop for a predetermined period of time. According to this, since both slide opening/closing and tilting opening/closing are performed, there are roughly four states: slide open, slide closed, tilt closed, and tilt open.
A compact opening and closing detector device can be constructed using a relatively thin switch operating cam. Safety is increased because it stops temporarily before fully closing. In the example described below, the four states are a state (mode) representing the section between the slide fully open and just before the fully closed position, a state (mode) representing the section between the fully closed position and the fully closed position, and a state (mode) representing the section between the fully closed position and the fully closed position. Status (mode) representing the section and tilt down completion -
It is assigned to a state (mode) that represents the period in which tilt-up is completed. In addition, since it is necessary to detect the predetermined opening degree before the slide is fully closed, the cam is shaped with concavities and convexities so that the switch generates a status signal that can be distinguished from the mode in the mode section. is the same as any of the modes ~, so the opening/closing control means detects the switching of the status signal when the panel is closed, and detects the predetermined opening before full closing. As a result, in addition to being able to control slide opening/closing, tilt opening/closing, and four modes using a thin switch operating cam with only two stages of concave and convex sections for switch operation, it is possible to control one more mode (slide opening/closing). (temporary stop at specified opening degree when closing)
became possible. Other objects and features of the present invention will become clear from the embodiments described below with reference to the drawings. [Embodiment] FIG. 1 shows an outline of an electric drive mechanism according to an embodiment of the present invention. In this embodiment, an opening 22 of a roof 21 of an automobile is used.
This is to drive and control the roof panel 23 that opens and closes. An opening 22 is formed in a roof 21 of an automobile, and this opening 22 is slid open/closed and tilted open/closed by a roof panel 23. Panel 23 is actuated by drive cables 24,25. The sunroof panel 23 is fixed to brackets placed on both sides of the opening 22 (only one side is shown in FIG. 1). As shown in FIG. 2, an elongated hole 27 is provided on the front edge side of the bracket 26 and extends downward toward the front of the vehicle, and a pin 28a of the front guide 28 is engaged with this elongated hole 27. A front shoe 29 is attached to the lower part of the front guide 28, and a front shoe 29 is attached to the bottom of the front guide 28.
One end of the front ring 30 is rotatably connected to the shaft 3.
The other end of the front ring 30 is pivotally connected to the bracket 26 at a shaft 32. As shown in FIG. 4, an engagement pin 38 is arranged on the rear edge side of the bracket 26, and a plate 33 is fixed with locking pins 34, 35. A guide slot 36 is formed in the plate 33, and the slot 36 has a horizontal portion provided on the front side of the vehicle and an inclined portion rising from the rear end of the horizontal portion toward the rear of the vehicle. Further, a tilt pin 37 is installed at the front end of the plate 33. The link 39 has a roller pin 40 at its front end, a rear shoe 41 at its rear end, and is rotatably pivoted, and is formed in an arc shape centered on the front end of the guide slot 36 that can be engaged with the tilt pin 37 at its upper end. It has a notched groove 42 and a guide pin 43. The guide pin 43 is engaged and guided in the guide slot 36. The unfinished ends of the drive cables 24, 25 are connected to a rear shoe 41, as shown in FIG. Therefore, the drive cables 24 and 25 move forward and backward through the rear shoe 41, the guide link 39, the guide pin 43 of the guide link 39, and the guide slot 36 in which the guide pin 43 is engaged, to the bracket 26, and further to the front. The signal is transmitted to the guide 28. As shown in FIGS. 4 and 5, the front shoe 29 and the rear shoe 41 are connected to the roof opening 2.
It is engaged and guided by guide rails 44 disposed on both sides of 2. Further, the foot portion 40a of the roller pin 40 is inserted into the rail groove 44a on the inside side of the vehicle interior of the guide rail 44.
is guided to engage. On the other hand, the rail groove 44 outside the vehicle of the guide rail 44
b, a trunk 38a of the engagement pin 38 is engaged and guided. Furthermore, as shown in FIGS. 4 and 6, a block 45 is fixedly disposed within the guide rail 44, and a head 40b of a roller pin 40 provided on the guide link 39 is guided on the interior side of the block 45. An inclined groove 46 for guiding the head 38b of the engagement pin 38 fixed to the bracket 26 is formed on the outside of the vehicle interior. Further, a notch is formed in the flange portions 48 and 49 of the guide rail 44 at a location where the block 45 is disposed. Therefore, as the engaging pin 38 moves up the inclined groove 47 of the block 45, the lower end 26 of the bracket 26
The leaf spring 51, which had been pressed by the block 45, moves upward and engages with the opening 50a of the block 45 (see FIG. 4). Further, an arm 52 is arranged on the front guide 28, and a rain gutter 53 is connected to the rear end.
Therefore, the rain gutter 53 always slides together with the roof panel 23, and can completely catch raindrops from the rear edge of the panel 23 (see FIGS. 1, 4, and 7). To explain the operation of the mechanism described above, the panel 23 normally closes the opening 23 as shown in FIG. When the drive cable 25 is actuated to move the rear shoe 41 toward the rear of the vehicle (to the right in FIG. 5), the guide link 39 also moves backward. The guide pin 43 is engaged and guided from the horizontal part to the inclined part of the guide slot 36 of the plate 33, and
3, the panel 23 is pulled rearward via the bracket 26 and its rear edge is urged downward. Therefore, the engaging pin 38 fixed to the bracket 26 descends along the inclined groove 47 of the block 45, and the movable panel 23 descends while moving rearward (FIGS. 7 and 8). At this time, when fully closed, the pin 31 is slightly lower than the pin 32, as shown in FIGS. 2 and 5, but as it descends, the front link 30
As shown in FIGS. 3 and 8, it is horizontal, so that it can be accommodated in the rear lower part of the roof 21 of an automobile, and the opening 22 is opened by sliding the panel 23. On the other hand, when the rear shoe 41 is moved forward by driving the drive cable 25 from the position shown in FIG. The guide link 39 rotates and rises while moving forward (see FIG. 9). As a result, the notch groove 42 of the guide link 39 engages with the tilt pin 37 implanted in the plate 33. When the rear shoe 41 moves further forward, the guide link 39 rotates upward while moving forward, causing the rear edge of the panel 23 to rotate upward and stand up, opening the opening 22 (see FIG. 10). Moreover, all the operations of the panel 23 are performed by the bracket 2.
6, after the panel 23 is assembled to the roof 21 of the automobile, the bracket 2
6 is in the fully closed position shown in FIG. 5, the panel 23 is fitted into the opening 22 with its weather strip bent, and then assembled and fixed to the bracket 26. As mentioned above, the fully closed state (Fig. 5 and 11
View 41 from the rear of the vehicle (right side in the drawing)
When the panel 23 is slid downward, the panel 23 slides open (FIG. 11c), and then slides further to fully open (FIG. 11d). When the shoe 41 is driven toward the front of the vehicle (to the left in the drawing) from the fully slid state of the panel 23, the state shown in FIG. 11c changes to the state shown in FIG. 11b, where the panel 23 closes the opening 22, and A weather strip on its front edge closes the opening 22. When the shoe 41 is further driven forward of the vehicle (to the left in the drawing) from this fully closed state, the rear end of the panel 23 rises and is tilted open (FIGS. 9, 10, and 11a). That is, the tilt is fully open (Fig. 10 and 11a)
When the shoe 41 is driven toward the rear of the vehicle (to the right in the drawing), the panel 23 first tilts closed to completely close the opening 22 (fully closed: Fig. 11b), then slides open and then slides. Fully open (11th d
Figure). On the other hand, if the slide is fully open, the
When the vehicle is driven forward, the panel 23 is fully closed, and furthermore, the rear end of the panel 23 is erected and tilted fully open. In this way, by simply sliding the shoe 41 backward and forward, the panel 23
changes the state from tilt fully open - tilt partially open - fully closed - slide partially open - slide fully open, and vice versa, changes the state from slide fully open - slide partially open - fully closed - tilt partially open - tilt fully open. Cables 24 and 25 that drive each of the shoes 41 on the side of the vehicle are connected to a cable drive mechanism that mainly includes a reducer 9 and a motor 11. and 25 are driven forward and backward in opposite directions by the reducer 9 section. FIG. 12a shows a plan view of the cable drive mechanism, and FIG. 12b shows a sectional view. The reducer 9 includes a worm 14 ₁ fixed to the rotating shaft of the motor 11 , and a worm wheel gear 1 that meshes with the worm 14 ₁ and is pivotally connected to the rotating shaft 15 .
4 ₂ , a gear 14 ₃ coupled to the gear 14 ₂ via a friction clutch 16 ₂ including a disc spring 16 1 and fixed to the rotating shaft 15; a gear 14 ₅ meshing with the gear 14 ₃ and fixed to the rotating shaft ₁₈ ; , a gear 1 fixed to the rotating shaft 18 and meshing with the toothed cables 24 and 25;
0 etc. constitutes a gear train. At the tip of the rotating shaft 15, as shown in FIG. 13, there is an eccentric bearing 19 having an eccentric circumferential surface 19a.
The cam 2 is fitted onto the circumferential surface 19a.
0 is pivoted. A planetary gear 201 is pivotally mounted on the eccentric bearing 19. The planetary gear 201 meshes with the housing inner teeth 210, and a pin 202 is formed on the planetary gear 201. Further, a cam 20 is pivotally attached to the leading end of the rotating shaft 15. A through groove is formed in the cam 20, and a pin 202 is engaged with this groove. As a result, the bearing 19 rotates as the rotating shaft 15 rotates, and the planetary gear 201 rotates between the housing inner teeth 2.
10 and rotate differentially, the pin 202 moves, and the cam 20 is pushed by this pin 202 and rotates. On the circumferential surface of the cam 20, there is one groove 20b in the upper stage.
However, two grooves 20a and 20c are formed in the lower part, and a limit switch 200b and a limit switch 200a are arranged in the upper part and the lower part of the circumferential surface, respectively, facing each other. In this embodiment, the states of the panel 23 are roughly shown as a slide open state (mode), a slide closed state (mode) from just before the slide is fully closed to fully closed, and a tilted closed state (mode) from the completion of tilt down to fully closed. ,and,
Four states (tilt open state (mode)) are detected, and the panel opening/closing control mode is specified in each state. More specifically, there are two switches 200a and 200b for opening detection, and the combination of opening and closing of these switches roughly represents only four states. In addition, a groove 20c is formed, and the groove 20c allows the switch 200a to be opened with the panel 23 opening approximately 10 cm toward the slide open side from the fully closed position. The mode in which the switch 200a is opened at the groove 20c (temporary stop instruction state: mode B) is in the above-mentioned mode section. FIG. 14 shows the relationship between the rotation angle of the cam 20, the open and closed states of the limit switches 200a and 200b, and the panel opening/closing control operation mode. Among the modes, (B) is a temporary stop instruction mode. The cam 20 rotates counterclockwise in FIG. 14 by urging the electric motor 11 to rotate normally from the tilt-up completed state (the state shown at the leftmost end of FIG. 14: corresponds to FIG. 11a), and the panel 23 is tilt down complete, fully closed, position just before fully closed, fully closed 10
cm, and as the limit switches 200a and 2 are fully opened, as shown in FIG.
00b is opened and closed. The cam 20 is rotated clockwise in FIG. 14 by reversely energizing the electric motor 11 from the fully open state (the state shown at the rightmost end of FIG. 14: corresponds to FIG. 11d), and the panel 23 is fully closed by 10 cm. As shown in FIG. 14, the limit switch 200 is moved to the forward, fully closed position, fully closed, tilt down completed, and tilt up completed.
a and 200b are opened and closed. This example detects overload (particularly when a human body is caught) and stops the motor in the event of an overload.
The temporary stop before cm for safety is when the panel 23 is in the mode and when the panel 23 is slid from the fully open side to the fully closed side. Referring again to FIGS. 12a and 12b.
When the cable 24 or 25 is stopped and restrained by a force exceeding a certain level, the friction clutch 16 ₂ slips and the gear 14 ₂ is rotationally driven by the motor 11, but the shaft 15 and the gear 14 fixed to the shaft are
₃ does not rotate. That is, the clutch ₁₆₂ is provided as a mechanical safety mechanism. FIG. 15 shows an electric circuit that performs forward and reverse drive energization and energization control of the motor 11. Referring to FIG. 15, one end of the motor 11 is connected to the power supply voltage +12V or the shear sea earth via the relay contact 231 of the motor driver 230.
The other end is connected to the power supply voltage +12V or to the sea-sea ground via a load detection resistor 240 and a relay contact piece 232. Relay contact 2 that makes this connection
31 and 232 are relay coils 23, respectively.
3 and 234. In this embodiment, a resistor 240 is used as load detection means. Further, the relay coils 233 and 234 are connected to the drive transistor 25 of the relay drive circuit 250, respectively.
1 and 252. This relay drive circuit 250 includes an electric control device 100, which will be described later.
Output ports 0 ₀ and 0 ₇ of the microprocessor 110 are connected. When the transistor 251 is turned on, the relay coil 233 is energized and the relay contact piece 231 switches to contact the power supply voltage +B (12V) side, so that the power supply voltage +
A current flows through the path B-contact piece 231-motor 11-contact piece 232-resistance 240-shear shear, the motor 11 rotates forward, and the sunroof panel 23 opens. When transistor 252 is turned on, relay coil 234 is energized and relay contact piece 232
contacts the power supply voltage +B side, and the power supply voltage +B-
Contact piece 232 - Motor 11 - Contact piece 231 - Resistor 24
A current flows through the 0-shear-sea-earth path, causing the motor 11 to rotate in reverse, and the panel 23 to close. The constant voltage power supply circuit 310 applies a constant voltage to each part of the circuit.
Give Vcc. The filter circuit 260 is a filter that removes high frequency fluctuations (high frequency components) of the motor load detection voltage (voltage of the resistor 240).
Diodes 261 and 262 are provided to protect the subsequent operational amplifier by cutting an input voltage higher than Vcc to Vcc+Vr (Vr is the forward voltage drop of the diode) and cutting an input voltage lower than ground potential to -Vr. Amplification circuit 270 amplifies the output of filter circuit 260 to a required level. This amplifier circuit 27
The output Vs of 0 will be treated as the load detection voltage from now on. The analog output Vs of the amplifier circuit 270 is applied to an 8-bit A/D converter 280, and 8-bit digital data representing Vs is provided to the microprocessor 110. Power-on reset circuit 290 is connected to the reset terminal of microprocessor 110 to reset microprocessor 110 when power is applied to each circuit. Input port I ₂₂ of microprocessor 110 ~
I ₂₇ has a tilt down instruction switch SWD, a tilt up instruction switch SWU, and a manual slide open instruction switch as means for instructing the opening and closing of the panel 23.
SWMO, automatic slide fully open instruction switch SWO,
A manual slide close instruction switch SWMC and an automatic slide fully close instruction switch SWC are connected. These switches remain closed only while they are pressed down, and return to their open state when they are released. First, explain what it means to close each switch.
summarized in the table.

〔Effect of the invention〕

As described above, according to the present invention, the overload reference value
After Vr is set at a predetermined point, the detected load Vs continues to increase, and when the detected load at the predetermined point exceeds the allowable value ΔL, an "overload" is detected.
This solves the problem of large variations in the amount of load fluctuation detected as "overload."

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an outline of the opening/closing mechanism of a sunroof panel installed on the roof of an automobile. 2 and 3 are enlarged side views showing the mechanism that supports the front part of the panel 23, with FIG. 2 showing the fully closed state and FIG. 3 showing the sliding open state. FIG. 4 is an enlarged side view showing a mechanism for supporting the rear part of the panel 23. FIG. 5 corresponds to the cross section taken along the line - in FIG. 1, and is a sectional view showing a state in which the panel is fully closed. FIG. 6 is a sectional view taken along the line -- in FIG. 4. FIG. 7 corresponds to the cross section taken along the line - in FIG. 1, but is a cross-sectional view showing a state in which the panel is slightly lowered to slide open. FIG. 8 corresponds to the cross section taken along the line - in FIG. 1, but is a sectional view showing a state in which the panel is slightly lowered and further slid open a little. FIG. 9 is a cross-sectional view taken along the line -- in FIG. 1, showing a state in which the panel is slightly tilted up. FIG. 10 corresponds to the cross section taken along the line - in FIG. 1, and is a sectional view showing a state in which the panel is completely tilted up. 11th
Figure a is a side view schematically showing a state in which the panel has completed tilting up, Figure 11b is a schematic side view showing the panel in a fully closed state, and Figure 11c is a schematic side view showing the state in which the panel is lowered and slides open. Figure, 1st
Figure 1d is a schematic side view when the panel is fully slid open. FIG. 12a is an enlarged plan view of the cable drive mechanism, partially cut away. 12th
Figure b is a sectional view taken along the line XIIB-XIIB of Figure 12a, and Figure 13.
The figure is an exploded perspective view of the rotating shaft 15 shown in Figure 12b. FIG. 14 shows the cam 20 and limit switches 200a, 20 shown in FIGS. 12a and 12b.
0b, the relative relationship in the panel open and closed states, the rotation of the cam 20, and the limit switch 200
It is an explanatory view showing opening and closing of a and 200b. FIG. 15 shows limit switches 200a and 200b.
FIG. 4 is a circuit diagram showing an electric circuit that energizes a panel opening/closing drive motor in response to an operation mode signal corresponding to opening or closing of the panel or in response to operation of an open/close instruction switch. 16a to 16j are flowcharts showing the control operation of the microprocessor 110 of the electric circuit. FIG. 17a is a graph showing overload detection timing by a conventional overload protection device, and FIG. 17b is a graph showing overload detection timing in an embodiment of the present invention. Code of mechanical element: 9: Reducer, 10, 14 ₂ ~
14 ₅ : Gear, 11: Electric motor, 14: Worm, 15, 17, 18: Rotating shaft, 19: Eccentric bearing, 20: Cam, 20a to 20c: Groove, 21: Roof, 22: Opening, 23: Roof panel (opening cover material), 24, 25: drive cable, 26: bracket, 28: front guide, 29: front shoe, 36: guide slot, 39: guide link, 41: rear shoe, 43: guide pin, 4
4: Guide rail, 45: Block, 47: Inclined groove, 52: Stopper piece, 201: Planetary gear, 2
10: Casing internal tooth, 202: Pin, 200
a, 200b: Limit switch (signal generation means), code of electric circuit element, 110: Microprocessor (open/close control means), 231, 232:
Relay contact piece, 233, 234: Relay coil, 2
40: Resistor (means for detecting load), 230,
250: Motor driver, SWMO, SWO,
SWMC, SWC, SWD, SWU: Open/close instruction switch, 260: Filter circuit, 270: Amplifier circuit, 290: Power-on reset circuit, 310:
Constant voltage circuit.

Claims (1)

[Claims] 1. An electric drive mechanism that includes an electric motor and an opening/closing mechanism that opens and closes an opening covering material according to the forward and reverse rotation of the electric motor; Load detection means that detects the load on the opening and closing mechanism; a motor driver that energizes; an open/close instruction switch means for instructing the electric motor to open or close; and a motor driver that instructs the electric motor to move forward or reverse in accordance with the operation of the open/close instruction switch means, thereby driving the motor. At a predetermined point after starting, refer to the load detection value Va to set the overload reference value Vr=Va+a・ΔL, and then refer to the detected load Vs of the load detection means to detect the rate of change Ks of the detected load Vs. , when the detected load increases, the overload reference value Vr is changed by the rate of change Kr = b Ks, which is the rate of change Ks multiplied by b, and when the detected load Vs exceeds the overload reference value Vr, the motor is overloaded. An automatic opening/closing device for an opening covering material, comprising: opening/closing control means for instructing a motor driver to stop the electric motor; provided that a: a coefficient of 0 or more and 1 or less, b: a coefficient of (1-a), ΔL : Tolerance value. 2 The opening/closing control means detects the detected load while the motor is driving.
When Vs decreases, when Vr - load detection value Vs<a・ΔL, Kr is set to the previous value, and when Vr - load detection value Vs≧a・ΔL, Kr=Ks, An automatic opening/closing device for an opening covering material according to claim 1. 3. The automatic opening/closing device for an opening covering material according to claim 1 or 2, wherein a=1/2.