JPH0221967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for an automobile sunroof, and more particularly to overload prevention of a drive source during positioning of an electric mechanism that drives the device.

Conventionally, electric drive sunroofs for automobiles use thermocouples, electronic devices, etc. to set the overcurrent value in advance, and when a foreign object such as a part of the body gets caught in the slide panel while the sunroof is operating, the drive device When the overcurrent exceeds the set overcurrent value, some devices cut off the circuit and stop the drive device.

However, in the entire operating process of the slide panel, that is, in the general operating part, the part that presses the deflector arm, and the part that raises the link and requires sealing force, the drive load is significantly different, so the operating current of the drive device is Change. Therefore, in the overcurrent detection method for a single set overcurrent value as described above, the set current value must be set to the maximum operating current, and depending on the position where the body is bitten, the driving load Since the overcurrent value was too low to reach the set overcurrent value, it was determined that it was operating normally, posing a risk of injury.

The object of the present invention is to divide the entire operation stroke of the slide panel in response to load changes, provide a set overcurrent value for each, and stop or reverse the drive device of the slide panel when an abnormal load is applied. , to prevent overloading of the drive device and restraint damage of the drive mechanism or injury to the human body.

In order to achieve the above object, in the present invention,
The electric drive mechanism includes mechanical or electrical switches such as limit switches and reed switches.
A signal generating means that generates a signal in conjunction with the mechanical movement is combined to obtain a signal corresponding to the position of the slide panel, and the setting change means changes the setting of the actual motor current based on the overcurrent. The gist of the configuration is that if the former value is greater than the latter value, the motor is deemed to be overloaded (mechanism support, object, or human body) and the motor is stopped.

With the above configuration, the set overcurrent value can be selected according to the load of the entire stroke of the slide panel, so the difference between the motor's normal current value and the set overcurrent value can be set to a small value, and a slight motor overload can be achieved. But it can be detected.

Note that when the electric drive mechanism is stopped and started, the motor current when starting the motor at a certain point is much larger than the motor current when passing a certain point at a steady speed. Therefore, in order to prevent this from being detected as an overload, in a preferred embodiment of the present invention, the above-mentioned overload detection is not performed for a predetermined period of time from when the motor is started until the motor reaches a steady speed.

Among the causes of overload on the electric drive mechanism, one of the most likely causes is a person or object getting stuck in the driven object. It is preferable to drive the motor in a direction opposite to the direction of rotation of the motor. Therefore, in a preferred embodiment of the present invention, when an overload is detected and the motor is stopped, the motor is energized to rotate in a direction opposite to the motor rotation direction immediately before stopping, and then the motor is stopped.

It is preferable to use a limit switch as the signal generating means because of its simple structure, but a reed switch, potentiometer, linear switch, or photo switch may also be used.

Furthermore, the load on the mechanism, that is, the load on the motor, is detected by a resistor inserted in the energizing current loop of the electric motor.

Examples of the present invention will be described below.

Fig. 11 shows the installed appearance of the slide panel 1 of an automobile sunroof, and Fig. 2 shows the installation appearance of the slide panel 1 of an automobile sunroof.
Line sectional views are shown in Figures 1 and 3, 4, and 5.
A cross-sectional view taken along the line - is shown in the figure. An opening 3 is formed in an automobile roof 2, and a slide panel 1 opens and closes this opening 3. A link 6 to the shoe 5 ₁ which can be slid along the opening 3 (along the longitudinal direction of the vehicle)
Cables 7 ₁ and 7 ₂ are fixed to the shoe 5 ₁ via cables ₁ and 6 ₂ , and toothed cables 8 ₁ and 8 ₂ are connected thereto. The toothed cables 8 ₁ and 8 ₂ are connected to a speed reducer 9 and meshed with a gear 10 . A rotating shaft of a DC motor 11 is coupled to an input shaft of the reducer 9 . When the motor 11 rotates in the forward direction, the gear 10 drives the toothed cables 8 ₁ and 8 ₂ in the panel 1 opening direction, and when the motor 11 rotates in the reverse direction, the gear 10 drives the toothed cables 8 1 and 8 2 in the panel 1 closing direction. A baffle plate 13 supported by arms 12 ₁ and 12 ₂ is pivotally attached to the front part of the opening 3 so as to be able to stand upside down. A clockwise rotational force is applied to the arms 12 ₁ and 12 ₂ by leaf springs (not shown).

As shown in FIG. 3, when the panel 1 is fully opened, the arms 12 ₁ and 12 ₂ receive the force of the leaf springs to make the air regulating plate 13 stand up. In this state, when the motor 11 is driven in the reverse direction, the panel 1 moves forward, and its tip comes into contact with the arms 12 ₁ and 12 ₂ after traveling a predetermined distance A, as shown in FIG. When the panel 1 moves further forward from this state, the tip of the panel 1 lowers the arms 12 ₁ , 12 ₂ , and along with this, the air conditioning plate 13 rotates clockwise, and the tip of the panel 1 climbs over the air conditioning plate 13 . Then, as shown in FIG. 5, the opening 3 is completely closed.

Next, an enlarged plan view of the speed reducer 9 is shown in FIG. 6, and a cross-sectional view thereof taken along the line is shown in FIG. The reducer 9 includes a worm 14 ₁ fixed to the rotating shaft of the motor 11,
Worm wheel gear 14 ₂ and gear 14 ₂ meshed with the worm 14 1 and pivotally connected to the rotating shaft ₁₅
A gear 14 3 is coupled to the rotary shaft 15 through a friction clutch 16 ₂ including a disc spring 16 ₁ , a large diameter gear 14 ₄ meshing with the gear 14 ₃ , and a gear 14 _{4 .}
A gear 14 ₅ that meshes with the rotating shaft 18 and is fixed to the rotating shaft 18 ,
and a toothed cable 8 ₁ , fixed to the rotating shaft 18 ,
A gear train is composed of gears 10, etc. that mesh with 8 ₂ . At the tip of the rotating shaft 15, as shown in FIG. 8, 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 200 is pivotally mounted on the eccentric bearing 19. The planetary gear 200 meshes with the housing inner teeth 210, and a pin 21 is formed on the planetary gear 200.
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,
A pin 21 is engaged in this groove. This results in
The bearing 19 rotates as the rotating shaft 15 rotates,
The planetary gear 200 meshes with the housing internal teeth 210 and rotates differentially, causing the pin 21 to move.
1, the cam 20 rotates. Two upper and lower grooves 20a and 20b are formed around the cam 20, and limit switches 22 and 23 are provided to face the grooves 20a and 20b, respectively. The operation of the cam 20 and limit switches 22, 23 will be explained with reference to FIGS. 9, 10, and 11. Here, FIGS. 9, 10 and 11
The figures correspond to FIGS. 3, 4 and 5, respectively. Panel 1 is in the fully open position (Figures 3 and 9)
), limit switches 22, 23
Both are pushed by a cam 20 to become switches 22 and 23. Here, in this embodiment, the limits 22 and 23 are of a normally open type. At this time, mode 11 is panel 1
When the cam 20 is driven in the opening direction, the cam 20 rotates in the direction D in the figure, and when the panel 1 rides on the arms 12 ₁ and 12 ₂ (Figs. 4 and 10), the push rod of the limit switch 22 fits into the groove 20a. At the same time, the limit switch 22 is closed. Furthermore, motor 1
1 is driven, panel 1 is in the fully closed position (Figure 5)
However, just before reaching the fully closed position, the push rod of the limit switch 23 fits into the groove 20b and is closed (FIG. 11). Therefore, in region A shown in the figure, limit switches 22 and 23 are both open, in region B, limit switch 22 is closed and limit 23 is open, and in region C, both limit switches 22 and 23 are closed.

Note that if the cable 8 ₁ or 8 ₂ is stopped and restrained by a force exceeding a certain level, the friction clutch 16 ₂ will slip and the gear 14 ₂ will be rotationally driven by the motor 11, but it will not stick to the shaft 15 and its shaft. The gear 14 ₃ that has been rotated does not rotate. In other words, clutch 16 ₂ is
It is provided as a mechanical safety mechanism.

Next, FIG. 12 shows the energizing current of the motor 11 when the panel 1 is normally driven from the fully open position to the fully closed position. The energizing current of the motor 11 shows a similar value when driving from the fully closed position to the fully closed position, but
The motor starting current at the fully closed position is higher than the level shown in FIG. 12, and the motor current immediately before the motor stops at the fully open position is lower than the level shown in FIG. Also, if the motor 1 is not fully closed or fully open,
When the panel 1 is stopped once and then is driven to fully open or fully close, the current of the motor at the time of startup becomes higher than the level during steady running as shown in FIG.

FIG. 13 shows an electric circuit that controls the forward and reverse drive of the motor 11 (controls the opening/closing positioning of the panel 1). One end of the motor 11 is connected to the motor drive circuit 3
The other end is connected to the power supply voltage V _B or the shear ground via a _resistor 40 and a relay 32 at the other end. Relay 31 and relay 32 are energized by relay driver 33 and relay driver 34, respectively. This motor drive circuit 30 constitutes an electric driver in this embodiment, and the resistor 40 constitutes means for detecting the load on the electric motor 11. 50 is a switch for opening/closing the sunroof, and when it is switched to the open side, the relay driver 33 is energized, and current flows through the path of power supply voltage V _B - relay 31 - motor 11 - resistor 40 - relay 32 - ground and motor 11. rotates forward.
Also, if you switch to the close side, the relay driver 3
4 is energized and the power supply voltage V _B -Relay 32-
Current flows through the path of resistor 40, motor 11, relay 31, and ground, causing the motor 11 to rotate in reverse. At this time,
A signal is taken out from one end of the resistor 40 and passed through the filter circuit 60 to the comparator 7 of the overload detection circuit 70.
1 non-inverting input terminal. Comparator 7
The inverting input terminal of 1 connects the constant voltage power supply voltage V _C to the resistor 7.
A predetermined voltage divided by voltages 2 and 73 is input, and the switch 22 is the limit switch 22 attached to the decelerator 9 described above. This switch 22
is closed, the inverting input terminal of the comparator 71 connects the constant voltage power supply voltage V _C to the resistors 72 and 73, 74, 7.
Since the voltage is divided by 5, the voltage is lower than the predetermined voltage. That is, these two predetermined voltages correspond to the set overcurrent value in this embodiment, and are switched in two stages as the limit switch 22 is opened and closed. When the motor 11 is operating normally, the output of the comparator 71 is at the "L" level, but when an overload occurs on the motor 11, the current flowing through the resistor 40 increases, and if this value exceeds the set overcurrent value, The output of comparator 71 switches to "H" level. Here, the diode 76 prevents malfunction due to chattering caused by the back electromotive force of the motor 11.

Reference numeral 80 denotes a motor inrush current mask circuit, which operates only when the opening/closing switch 50 is switched to the closed side. In other words, when the on/off switch 50 is switched to the closed side, one end of the capacitor 82 is grounded via the diode 81, so the input voltage at the non-inverting input terminal of the comparator 83 decreases, so the output of the comparator 83 decreases. It becomes "L" level. after that,
The capacitor 82 is connected to a constant voltage power supply via a resistor 84.
Since it is charged by V _C and the input voltage at the non-inverting input terminal of the comparator 83 increases, the output of the comparator 83 becomes "H" level. That is, the mask circuit 80
When the open/close switch 50 is switched to the closed side, the output of the comparator 83 is set to the "L" level for a predetermined period of time, and is then held at the "H" level. Here, the predetermined time is determined by the capacitor 82 and the resistor 84, and in this embodiment, this time is set to 0.2 seconds.

In the sunroof closing switch detection circuit 90, when the opening/closing switch 50 is switched to the closing side, the inverting input terminal of the comparator 91 is grounded via the diode 92, so the output of the comparator 91 becomes "H" level. Become. That is, the closing switch detection circuit 90
outputs “H” level while the open/close switch 50 is closed, and otherwise outputs “L” level.
Output the level.

Next, in the motor stop circuit 100, the closed terminal of the open/close switch 50 is connected to the relay driver 34 via a transistor 101. Further, the base of the transistor 102 includes the overload detection circuit 70, a mask circuit 80, and an on/off switch detection circuit 9.
0 and the limit switch 23 of the reduction gear 9 described above are connected together.
Therefore, if the open/close switch 50 is switched to the closed side and the transistor 102 is off at this time, the transistor 101 is turned on and the relay driver 34 is energized. In addition, the transistor 10
2 turns on only when the outputs of the overload detection circuit 70, mask circuit 80, and open/close switch detection circuit 90 are all at the "H" level and the switch 22 is opened.

The collector of this transistor 102 is connected to a motor reversing circuit 110. transistor 1
When 02 is turned on, the collector potential decreases, and the potential at one end of the capacitor 112 decreases via the diode 111, so the input to the inverting input terminal of the comparator 113 decreases, and an "H" level is output from the output terminal. This "H" level is applied to the mask circuit 80.
Similarly, after being held for a predetermined time determined by capacitor 112 and resistor 114, it switches to the "H" level. In this embodiment, this predetermined time is set to 0.3 seconds. While the output of the comparator 113 is held at the "H" level, the transistor 115 is turned on, energizing the relay driver 33 and causing the motor 11 to rotate forward.

The sunroof is controlled by the above circuit as follows.

The sliding panel can be opened by switching the opening/closing switch 50 to the open side, and when the switch 50 is turned off, the sliding panel stops at that position.

To close the slide panel, when the open/close switch 50 is switched to the close side, the transistor 1
01 is turned on, the relay driver 34 is energized, and the motor 11 starts rotating in reverse.

At this time, the output of the open/close switch detection circuit 90 switches to the "H" level. Furthermore, since a large current flows when the motor 11 starts driving, the overload detection circuit 70 is activated and the output becomes "H" level.
Since the mask circuit 80 operates and makes its output "L", the transistor 1 of the motor stop circuit 100
02 remains off, and the closing operation of the slide panel continues. Thereafter, when the motor 11 enters steady operation, the output of the overload detection circuit 70 becomes "L" and the output of the mask circuit 80 becomes "H". Here, if a foreign object such as a body gets caught in the slide panel, the motor 1
1, the overload detection circuit 70 is activated and the transistor 10 of the motor stop circuit 100 is activated.
2 is turned on, the transistor 101 is turned off, power to the motor 11 is cut off, and the slide panel stops. Furthermore, the motor reversing circuit 110 is activated,
Move the slide panel in the opening direction for a predetermined period of time. In this way, overload is detected and the slide panel is stopped.

In addition, when the slide panel is fully opened,
Since the switch 22 is open, the overload detection circuit 70
The set overcurrent is at a low level, and when the slide panel rides on the deflector arm (see FIG. 4), the switch 22 is closed and the set overcurrent is set at a high level. In addition, the switch 23 closes just before the slide panel 1 is fully closed, and a large current (first
(see part C in Figure 2) prevents the motor stop circuit 100 from operating.

Here, although the set overcurrent is switched in two stages in this embodiment, it is also possible to switch it in multiple stages depending on the application.

Furthermore, although this embodiment relates to a safety device for an automobile sunroof, the present invention can be similarly applied to other on-vehicle equipment that is rotated or reciprocated by an electric mechanism, such as an on-board seat, a side window, and a mirror. It is something that can be used.

[Brief explanation of drawings]

Figure 1 is a plan view showing an overview of the opening/closing mechanism of a sunroof installed on the roof of an automobile, Figure 2 is a sectional view taken along the line - - when panel 1 in Figure 1 is fully closed, Figures 3, 4, and 5. The figure is a sectional view taken along the line -- in FIG. Figure 6 is an enlarged plan view of the reducer shown in Figure 1;
Fig. 7 is a sectional view taken along the line - - in Fig. 6, Fig. 8 is an enlarged perspective view of a part of the rotating shaft, Figs. 9 and 10.
FIG. 11 is a plan view showing the positional relationship of the cam and limit switch of the reducer shown in FIG.
FIG. 12 is a graph showing the current of the drive motor when driving the slide panel from the fully open position to the fully closed position. FIG. 13 shows an electric circuit for driving and energizing the electric motor of the opening/closing mechanism. 1...Slide panel, 2...Roof, 3...
Opening, 4 ₁ ... Guide rail (supporting means), 5 ₁ ...
...Shu (support means), 6 ₁ , 6 ₂ ... Link, 7
₁ , 7 ₂ ... cable, 8 ₁ , 8 ₂ ... toothed cable (electric drive mechanism), 9 ... speed reducer (electric drive mechanism),
10, 14 ₂ to 14 ₅ ... Gear, 200 ... Planetary gear, 210 ... Housing internal tooth, 11 ... Motor (electric drive mechanism), 12 ₁ , 12 ₂ ... Arm, 13
...Wind regulating plate, 14 ₁ ...Worm, 15,17,
18... Rotating shaft, 20... Cam, 20a, 20b
...Groove, 21 ...Pin, 16 ₁ ...Disc spring, 19
...Eccentric bearing, 16 ₂ ...Friction clutch, 22,
23...Limit switch (signal generation means), 3
1, 32...Relay (electric driver), 40...
Resistor (means for detecting load), 70...Overload detection circuit (electronic control unit), 80...Motor rush current mask circuit (electronic control unit), 90...Closing switch detection circuit, 100...Motor Stop circuit (electronic control device), 110...Motor reversal circuit (electronic control device).

Claims (1)

[Scope of Claims] 1. Supporting means for movably supporting the slide panel; An electric drive mechanism for driving the slide panel; Connected to the electric drive mechanism and corresponding to the position of the slide panel in conjunction with the operation of the electric drive mechanism. an electric driver for energizing the electric motor of the electric drive mechanism; a means for detecting a load on the electric motor; and a setting changing means for changing the setting of the overcurrent value based on the signal. A safety device for a sunroof for an automobile, comprising: an electronic control device that compares the overcurrent value with the load of the electric motor and stops energizing the electric motor when the load exceeds the overcurrent value. 2. The safety device for an automobile sunroof according to claim 1, wherein the electronic control unit does not perform the comparison for a predetermined period of time from the start of energization of the electric motor, but performs the comparison after a predetermined period of time. 3. After the electric motor load exceeds the set overcurrent value and the electric motor stops energizing, the electronic control device continues to stop energizing the electric motor in the same direction as the rotational direction of the electric motor before stopping, 3. A safety device for a sunroof for an automobile according to claim 1, wherein the electric motor is energized in the opposite direction and thereafter energized in accordance with the energizing support in the same direction. 4. The vehicle according to claim 1, 2 or 3, wherein the setting changing means is a comparator that switches the reference voltage based on the signal from the signal generating means and compares it with the load of the electric motor. Sunroof safety device. 5. The safety of an automobile sunroof according to claim 1, wherein the signal generating means generates a signal opposite to the position of the slide panel by a cam and a limit switch driven by a planetary gear mechanism arranged in the electric drive mechanism. Device. 6. The safety device for an automobile sunroof according to claim 1, wherein the means for detecting the load on the electric motor is a resistor inserted in the energizing current loop of the electric motor.