JPS62280476A - Drive apparatus with overload protecting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a drive device with an overload protection device, and in detail,
The present invention relates to a drive device with an overload protection device that prevents accidents such as opening and closing of an opening covering material, such as a windshield of a side window of a vehicle or a roof panel of a sunroof.

[Prior Art] Conventionally, as a drive device with an overload protection device, for example, “Drive control device for on-vehicle electric equipment” disclosed in Japanese Patent Application Laid-open No. 59-83218 and “Motor Inventions and proposals such as "overload protection drive device" are known.

In these inventions and proposals, for example, the load level of the drive of the motor that opens and closes the side window of a vehicle is detected, and when the load level becomes greater than a predetermined level, the side window is moved when the windshield is raised. It determines that an arm or the like is caught in the window and performs controls such as stopping the motor or rotating the motor in the opposite direction to lower the window glass. In addition, a predetermined load level corresponding to a predetermined position of the windshield is stored in advance in a semiconductor memory, etc., and by comparing this level with the load level of the motor drive, the pinching of the side window can be prevented. More precise control such as detection is also being performed.

[Problems to be solved by the invention] These inventions and proposals can accurately detect when an object is caught in a side window, etc., and can prevent objects from getting caught in the side window, etc., resulting in personal injury. Although it has an excellent effect of preventing accidents, the following problems still remain. In other words, in these drive devices with overload protection devices, the judgment level used for overload detection is set in advance, so it is difficult to accurately detect the occurrence of overload depending on changes over time in the power system that drives the opening covering material. It was thought that it could not be determined. For example, in the drive device that opens and closes the windshield of a vehicle, the coefficient of friction increases due to deterioration of the rubber material of the door sash that is pressed into contact with the windshield, rust on the window regulator, adhesion of dust, or depletion of lubricant. Therefore, there was a problem that the load on the drive device would increase, and this would be mistakenly detected as an overload. Therefore, in order to always accurately detect overload, it is necessary to adjust the judgment level. Additionally, if the load is reduced due to an overhaul, etc., the overload detection sensitivity will decrease, and it may not be possible to sufficiently detect a pinched arm, etc. In such cases, It was thought that readjustment would be necessary.

Configuration of the Invention [Means for Solving the Problems] In order to solve the above problems, the configuration of the drive device with an overload protection device of the present invention is as follows.

That is, as the basic configuration is illustrated in FIG. 1, the drive device with overload protection device of the present invention includes a drive means (M2) for opening and closing an opening covering material (Ml) that covers an opening; load detection means (M3) for detecting the load on the driving means (M2) when the opening covering material (Ml) is opened and closed by the driving means (M2); and the opening covering material driven by the driving means (M2). (
When Ml) moves, the detected driving means (M2)
comparison value learning means (M4) for learning a comparison value used for detecting overload of the drive means (M2) based on the load of the driving means (M2);
and, driven by the driving means (M2), the opening covering material (
When Ml) moves, the detected driving means (M2)
a comparison means (M5) for comparing the value of the load of the load with the learned comparison value; and a comparison means (M5) for comparing the value of the load of the drive means (M
and drive stop means (M6) for stopping the drive means (M2) when it is determined that the load value in step 2) is larger than the comparison value.

Here, the opening covering material (Ml) that covers the opening is, for example, a side window of a vehicle (driver's door window).

Various examples can be considered, such as a window of a passenger door, a window of a door behind a driver's seat, a window of a door behind a passenger seat, a roof panel of a sunroof, etc., and the present invention is not limited to vehicles.

The driving means (M2) is for opening and closing the opening covering material (Ml), and may be a motor in the case of an electric type, or an air cylinder, a hydraulic cylinder, etc. in the case of a pressure type. The opening/closing method of the opening covering material (Ml) opened/closed by the driving means (M2) may be a sliding type or a tilting type.

Load detection means (M3) detects the load of the drive means (M2)
) may be of any configuration as long as it can detect the load of the driving means (M2).For example, in a motor etc., it is a configuration for detecting the load current, and in an air cylinder, a hydraulic cylinder, etc., it is a configuration for controlling it. As a configuration for measuring the amount of air and oil, or each drive means (M2)
It is conceivable to realize this as a configuration that directly detects the torque of .

The comparison value learning means (M4) is based on the load of the drive means (M2) detected by the load detection means (M3) when the aperture covering material (Ml) is moved by the drive means (M2). It is a means for learning a comparison value used for detecting an overload of the driving means (M2), and can be constructed using a semiconductor memory, a magnetic tape, or the like. This learned comparison value is based on the load of the driving means (M2) detected at each position where the opening covering material (Ml) moves, and is also a value corresponding to each position where the opening covering material (Ml) moves. Alternatively, it may be a value based on the maximum load or average load of the driving means (M2) detected when the opening covering material (Ml) moves. Further, the comparison value may be configured to restart from a predetermined initial value each time the vehicle's ignition switch is turned on, or it may be stored in a non-volatile memory or the like even after the ignition switch is turned off. It may be configured to restart from the value. Furthermore, when the comparison value is learned,
This may be the time when the opening covering material (Ml) moves in the opening direction or the time when it moves in the closing direction. Furthermore, learning of this comparison value can be carried out in case of an abnormality, for example, by the comparison means (M
It goes without saying that step 5) is not executed when an overload of the driving means (M2) is detected.

The comparison means (M5) compares the detected load value of the drive means (M2) with the learned comparison value when the opening covering material (Ml) is moved by the drive means (M2). It is a means for learning the comparative value (M
4) etc., it is conceivable to configure it as a logic operation circuit. Furthermore, when this comparison means (M5) performs the comparison,
This may be done when the aperture covering material (Ml) moves in the opening direction, or when it moves in both opening and closing directions, but generally in the case of vehicle windshields, etc., it is done at the following timing. is suitable. In other words, it is desirable that the comparison value learning means (M4) learns the comparison value when opening the window glass, etc., where there is no risk of objects being caught, and that the comparison means (M5) performs a comparison for detecting the pinching when closing the window glass, etc. . Further, from a safety standpoint, it is preferable that the comparison means (M5) is configured to use a preset initial value as a comparison value until learning is performed at least once by the comparison value learning means (M4). It is.

The drive stop means (M6) that stops the drive means (M2) is a comparison means (M5) that compares the magnitude relationship between the detected load value of the drive means (M2) and the learned comparison value. means for forcibly stopping the driving means (M2) when it is determined that the value of the loaded load is larger than the comparison value, and is a means for forcibly stopping the driving means (M2) by outputting a stop signal to the driving means (M2), etc. It is conceivable to configure the system so that the operation of (M2) is stopped. In addition, after the driving means (M2) has stopped, the opening covering material (
It goes without saying that the structure may be constructed so that the Ml) is moved by a predetermined amount to eliminate overload caused by pinching or the like.

[Function] The drive device with overload protection device of the present invention functions as follows.

The drive device with overload protection device of the present invention has a drive means (M2
) to open and close the opening covering material (Ml) that covers the opening.
) moves, a value based on the load of the drive means (M2>) detected by the load detection means (M3) is learned as a comparison value by the comparison value learning means (M4), and the value based on the load of the drive means (M2>
) when the aperture covering material (Ml) is moved, the drive means (M1) detected by the load detection means (M3)
The comparison means (M5) compares the magnitude relationship between the load value of 2) and the comparison value learned by the comparison value learning means (M4), and as a result of the comparison, the driving means ( When it is determined that the load value of M2) is larger, the drive stop means (M6) operates to forcibly stop the operation of the drive means (M2).

[Example] Next, in order to further clarify the structure of the drive device with overload protection device of the present invention, a preferred example will be described with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing the configuration of a drive device with an overload protection device according to an embodiment of the present invention.

As shown in the figure, the drive device with an overload protection device of the present embodiment opens and closes a windshield WG of a vehicle night window (hereinafter also simply referred to as a window) SW, and includes a window regulator WR, a DC motor 1 as a drive source for the window regulator WR; a forward rotation relay 2 that rotates the DC motor 1 in the forward direction when in the on state;
A reverse rotation relay 3 that rotates the DC motor 1 in the reverse direction when it is on (the forward rotation relay 2 and the reverse rotation relay 3 are not turned on at the same time), a load detection circuit 4 that detects the load applied to the DC motor 1 , a windshield position sensor 6 that detects the moving position Hereinafter, simply referred to as ECU>1
It is composed of 0, etc. The drive device with overload protection device of this embodiment is supplied with power from the vehicle-mounted battery BAT via the ignition switch IG.

Further, in this embodiment, the side window SW.

Window regulator WR, DC motor 1. The window glass position sensor 6, the window glass position setting device 8, and the like will be collectively referred to as a window section 12.

The load detection circuit 4 is composed of a resistor R1 and a differential amplifier 14, and detects the load current flowing through the DC motor 1.
The voltage is converted into a voltage by a resistor R1 (the value of the resistor R1 is minute), and the voltage corresponding to the voltage drop caused by the resistor R1 is amplified by the differential amplifier 14 to be detected.

The window glass position sensor 6 is composed of a potentiometer and the like, and outputs the movement of the position of the window glass WG as a change in voltage.

In this embodiment, the output voltage is configured to increase each time the position of the window glass WG rises.

The windshield position setter 8 is composed of a sliding variable resistor, and is configured to generate a higher voltage in response to the position of the windshield WG set by the occupant, and the higher the set position is. There is.

ECUIO is the well-known CPU3. O, ROM31°RA
M32. Backup RAM 33 and output circuit 35. It is configured as a logic operation circuit in which an input circuit 36 and the like are interconnected by a bus 37.

The output circuit 35 has a forward rotation driver 40. They are each connected to the reverse rotation driver 41 so as to be able to output. Positive rotation driver 40. The reverse rotation driver 41 is connected to the forward rotation relay 2. When the windshield WG is raised, the output circuit 35 outputs a high level output signal to the forward rotation driver 40, and when the windshield WG is lowered, the output circuit 35 outputs a high level output signal to the reverse rotation driver 40. The output signal to 41 is set to high level. As a result, when the windshield WG is raised, the forward rotation relay 2 is turned on, the reverse rotation relay 3 is turned off, and the load (drive) current I of the DC motor 1 is changed to the make contact 2a of the forward rotation relay 2. The current flows from the DC motor 1 to the break contact 3b of the reverse rotation relay 3, and from the break contact 3b to the resistor R1 of the load detection circuit 4, causing the DC motor 1 to rotate forward (in Fig. 2, the current I
(shown as a). Conversely, when lowering the window glass WG, the forward rotation relay 2 is turned off, the reverse rotation relay 3 is turned on, and the load current I of the DC motor 1 is
From the make contact 3a of the reverse rotation relay 3 to the DC motor 1,
A current flows from the DC motor 1 to the break contact 2b of the forward rotation relay 2, and from the break contact 2b to the resistor R1, causing the DC motor 1 to rotate in the reverse direction (shown as current Ib in FIG. 2).

On the other hand, the input circuit 36 includes the differential amplifier 14. of the load detection circuit 4 described above. Windshield position sensor 6 of window portion 12
, and two Indian glass position setting devices 8 are connected to each other via an A/D converter 42 .

As a result, ECUlo determines the load current I of the DC motor 1 detected by the differential amplifier 14, the moving position X of the windshield WG detected by the windshield position sensor 6, and the movement position The movement position X of the windshield WG is suitably controlled based on each input value such as the set position SP.

Next, the operation of ECUlo is shown in Figures 3, 4, and 5 (A
This will be explained using the flowchart shown in > or C).

The flowcharts shown in FIGS. 3, 4, and 5 (A> to C) represent "overload protection processing" executed by ECUlo.

First, when the ignition switch IG is turned on, the process is executed from step 100. In step 100, so-called initialization is executed to return the values of various flags, etc., which will be described later, stored in the RAM 32 to their initial values. When this initial setting is completed, the process proceeds to step 110. .

In step 110, the CPU 30 uses the backup RA
The pinch load F(X) stored in M33 is read and the read pinch load F(x) is stored in the RAM.
32 is executed. This pinching load F(
x) will be explained using the graph shown in FIG.

The graph shown in FIG. 6 shows the differential amplifier 14 based on the load current I flowing through the DC motor 1, with the horizontal axis representing the moving position X of the windshield WG output from the windshield position sensor 6.
The vertical axis is the motor load M(X) output by
(X) indicates the level of motor load M(X) with respect to the moving position @X when the windshield is lowered (hereinafter,
The solid line U(X) is called the rising load U(x), and the broken line D (x> is called the falling load D(X)). In addition, the dashed-dotted line F(X) is
It represents the pinching load F(x), and the descending load D(x
> is multiplied by a predetermined value Z (Z>1>. This is,
This will be compared with the motor load M(x) during the rise in a step to be described later.

The moving position
1 when the windshield WG is fully open, 100 when it is fully open
It is expressed as a digital value X obtained by dividing the position of the windshield WG into 100 so that the position of the windshield WG is divided into 100, and the larger the value X is, the higher the position of the windshield WG is.

As can be seen from this graph, in general, the motor load M(
The level of X) varies greatly depending on the position of the window glass WG due to differences in gear efficiency of the window regulator WR, etc. Further, although the graph of the descending load D(X) and the graph of the ascending load U(X) are very similar in shape, their levels are different. This descending load D(x) and rising load U(x
The difference is that even though the efficiency of the window regulator WR is almost the same when descending and ascending, various frictional forces
For example, this is due to the fact that the conditions affected by the frictional force between the window glass WG and the rubber material of the door sash portion of the window SW, the weight of the window glass WG and the window regulator WR, etc. are different when descending and when ascending. However, if the level of the descending load D(X) with respect to the movement position X of the window glass WG is known from this graph, the window S
It can be seen that the level of the rising load tJ (X) can be estimated as long as the DC motor 1 is not subjected to an overload such as an object being caught in W. Therefore, in this embodiment, the window pinching load F(x) is determined using the descending load D(X) corresponding to the movement position X of the windshield WG when the window glass WG is lowered, and this pinching load F(X
) is stored in the backup RAM 33 (
(performed in the steps described below). Here, when the moving position X of the windshield WG is closed to the extent that small objects such as fingers are not pinched (moving position The value of is set sufficiently large. This caused the windshield WG to approach the fully open state and become overloaded.
This is to prevent it from being determined that an object has been caught between the two.

In this embodiment, the pinching load F(x> is the value obtained by multiplying the descending load D(X) by a predetermined value Z(Z>1), but if it is a value based on the descending load D(X) For example, it may be a value obtained by adding a predetermined value Z1 (Zl>O) to the descending load D(X), or may be a value obtained by multiplying the descending load D(X) by a predetermined value Z. It may be a value obtained by adding the value Z1.

The pinching load F(x> in step 110 is
When the process of writing to 32 is completed, the process proceeds to the next step.

The subsequent process from step 120 is a process for actually controlling the operation of the window glass WG.

First, in step 120, the window glass position setting device 8. Windshield position sensor 6° differential amplifier 1
Windshield WG setting position S output from 4 respectively
The analog signals of P, window glass movement position
A/D conversion is carried out by , and the A/D converted values are stored in the RAM 32 as digital values.

Here, the set position SP is similar to the movement position X mentioned above.
1. At the windshield WG fully open position. 10 in full open position
This is a digital value that is set to 0. Further, the motor load M(x) indicates the load level of the DC motor 1 with respect to the moving position X of the window glass WG, and indicates the normal rotation of the DC motor 1.

Regardless of the reversal, as the load current (2) increases, its value also increases.

In the following step 130, it is determined whether or not there is a change in the set position SP set by the windshield position @ setting device 8 by the occupant, that is, the set position SP stored last time and the set position SP read this time are checked in step 120. It is determined whether there is a change between the two. Here, when the windshield position setter 8 is operated by the occupant and it is determined that there is a change in the set position SP, an overload flag O, which will be described later, is detected.
The value of F is reset to the value O (step 140), and on the other hand, when it is determined that there is no change in the set position SP, directly,
Proceed to the next step 150.

In step 150, it is determined whether the movement position X is below the position FE, which is sufficiently closed to the extent that a part of the occupant's limbs, etc. can no longer be caught in the window SW. This means that if the moving position X is located above the position FE,
This is because there is no chance of objects getting caught in the window switch. Here, if the moving position X≦FE holds true, it is determined whether the window glass WG is currently being lowered (step 160). This determination is made by determining the value of a descending flag DF, which is set to the value 1 when the window glass WG descends in a process to be described later.

If the descending flag DF=1, the process is descending processing DRT.
If DF is not 1, the process goes to ascending process UR.
Proceed to T. The processes performed by the descending process DRT and the ascending process URT will be explained with reference to the graph of FIG. 7.

The graph shown in Fig. 7 is similar to the graph shown in Fig. 6, but the descending load D when the windshield WG is stopped in the middle of being fully opened and fully opened, and then lowered and raised again. (X), rising load U(X), and pinching load F(X), respectively. Here, the position to start descending is represented by DP, and the position to start rising is represented by UP, respectively.Hereinafter, they will simply be referred to as descent start position DP and ascent start position UP.
It is called.

In the descending process DRT, first, the motor load M(x
) is set as the descending load level D (X) corresponding to the movement position X of the window glass WG (step 170). Subsequently, it is determined whether the movement position X is larger than the value obtained by subtracting a predetermined movement amount CW from the descent start position DP (step 180). If it is determined that the movement position

In step 190, the descending load D (DP+1>) immediately before the windshield WG stops is multiplied by a predetermined value Z, and in step 200, the descending load D(x) during the descent is calculated.
multiplied by a predetermined value 2 is stored in the backup RAM 33 as the pinching load F(X). This is due to the following reasons.

As shown in the graph of descending load D(X) in Fig. 7, from the state where the windshield WG is stopped at the moving position When the DC motor 1 is lowered, an overcurrent due to the motor starting current and static friction force flows through the DC motor 1, so that the pinching load F(
This is because if X) is determined, the overload level becomes relatively low, which may cause malfunctions. Therefore, until the windshield WG stably starts S, the amount of movement @x=DP is not affected by the motor starting current, static friction force, etc.
-CW, the descending load D (DP
+1) is used to calculate the pinching load F(x>).As a result, if the movement position The value becomes a constant value as shown in the graph of Fig. 7.In addition, the pinching load F(x) at this downward start
For example, consider assuming a straight line connecting the descending load D (DP-1> and the descending load D (DP-CW) at which the windshield begins to move stably) and setting it based on this assumed value. It will be done.

On the other hand, in the ascending process URT, it is first determined whether the moving position X is smaller than the value obtained by adding a predetermined moving amount BW to the ascending starting position UP during ascending (step 210). If it is determined that the movement position If, on the other hand, it is determined that the condition does not hold after X), the process directly proceeds to step 220.

This is due to the following reasons.

As shown in the graph of rising load U (X) in Fig. 7, from the state where the windshield WG is stopped at the moving position X = UP [the value of rising load U (x) is zero level],
When it is raised again, similar to when it was lowered, overcurrent due to the motor starting current and static friction force flows, so that the pinched load F(x
) is used as it is to compare the motor load M(x), there is a risk of malfunction. Therefore, until the windshield WG starts moving stably (UP<movement position x<
UP+BW), and the value obtained by adding the predetermined load DW to the stored pinching load F (x) is set as the pinching load F(x), and is used for comparison.

In step 220, the pinching load F(X) stored in the backup RAM or the pinching load F(x) calculated in step 210 is combined with the windshield W.
A comparison is made with the motor load M(X) when G increases. This means that if the motor load M(x) at the time of rising exceeds the set pinching load F(X), the window switch
This is to determine that an arm, finger, etc. has been caught in the

Here, if it is determined that motor load M (x) > F (x) is satisfied, the process proceeds to step 230, and if it is determined that it is not satisfied, the process goes to step 1 and the raising process tJRT ends.

In step 230, an overload flag OF when an object is caught in the window SW is set to the value 1, and for safety, the windshield SW is moved from the movement position X where the object was caught.
A position for lowering the position by a predetermined movement amount AW is stored as MP (hereinafter referred to as protection position MP).

When the above-described descending process DRT and ascending process URT are completed, the process proceeds to step 250. In this embodiment, the period during which the pinching load F(X) at the start of descent and ascent is set is the period in which the windshield WG moves by a predetermined amount of ff1cW and BW, respectively. It is also conceivable to configure the system by setting a predetermined delay time.

In the following step 250, the value of the overload flag O[ is determined. That is, when it is determined that the overload flag 0F=1 is established, the next maintenance SRT (steps 260 to 280) is executed. This protection process SRT is a process for lowering the movement position X of the windshield WG to the protection position MP set in step 230.

First, in step 260, the movement position X and the protection position MP are
A comparison is made with Here, if it is determined that movement position The "window glass lowering process" carried out in step 270 is a process for lowering the window glass WG, and the "window glass stopping process" carried out in step 280 is a process for stopping the window glass WG ( (Details will be explained later). This step 26
Under the protection processing SP from 0 to 280, the windshield position setter 8 is operated by the occupant until the set position SP changes and the value of the overload flag OF is reset to O (
Steps 130-140) continue to be executed. Thereby, the window glass WG is lowered by a predetermined distance ff1AW from the position where it is determined that an object is caught in the window SW.

On the other hand, if no overload is detected in step 250, it is determined that the overload flag 0F=1 does not hold, and the process proceeds to step 300 and thereafter, and the window glass W
Processing is performed to make the moving position X of G coincide with the set position SP. Note that if it is determined in step 150 that the movement position
The same process can be performed without executing the process of Stella P3.
Proceed to 00 onwards.

First, in step 300, the moving position
The magnitude relationship between the two is determined. That is, when it is determined that the moving position X>SP, the moving position x=sp
When it is determined that the moving position x<3
When it is determined that p, the processing proceeds to step 310. The "windshield lowering process", "windshield stopping process", and "windshield raising process" in steps 270, 280, and 310 are shown in FIG.
) will be explained using a flowchart.

The "windshield lowering process" executes the process shown in the flowchart in FIG. Since the window glass WG is already descending when the
It can be handled as RNJ, but if it is determined that it is not established, step 36
Execute processing from 0 to 380.

In step 360, to start the descending process, the values of the ascending flag UF and descending flag DF are each set to 0.1. When the rising flag UF and falling flag DF are each set to a value of 1, they indicate that the rising flag UF and the falling flag DF are rising, respectively.
It shows that it is descending. Next, a process is performed in which the current movement position X is stored in the RAM 32 as the descent start position DP (step 370). In the following step 380,
In order to reversely rotate the DC motor 1 and lower the window glass WG, a reverse rotation driver 4 is connected via an output circuit 35.
Processing is performed to make the output signal of 1 high level. As a result, while the value of the descending flag DF is 1, the window glass WG continues to descend.

The "windshield stop process" executes the process shown in the flowchart of FIG. 5(B). That is, in step 390, it is assumed that the moving position forward rotation driver 40. Processing is performed to set the output signal of the reverse rotation driver 41 to a low level.

This causes the DC motor 1 to stop.

The "windshield raising process" executes the process shown in the flowchart of FIG. 5(C). First, in step 410, the value of the rising flag UF is determined. Here, when it is determined that the rising flag UF="l is established, it is assumed that the windshield WG is already rising, and the process can be handled as rRE-URNJ; when it is determined that it is not established, step 4
20 to 440 processes are executed.

In step 420, to start the ascending process, a process is performed in which the values of the ascending flag UF and descending flag DF are each set to 1.0. Next, a process is performed to store the current movement position @X in the RAM 32 as the ascent start position UP (
Step 430).

In the following step 440, the output circuit 35 is activated in order to rotate the DC motor 1 in the forward direction and raise the window glass WG.
A process is performed in which the output signal of the forward rotation driver 40 is set to a high level. As a result, the window glass WG continues to rise while the value of the rise flag U'' is 1.

By executing the steps 300, 270, 280, and 310 above, the windshield WG is moved to the set position S.
It is lowered or raised to P and stopped at the set position SP.

According to the drive device with overload protection device of the present embodiment described in detail above, each time the window glass WG is lowered, the descending load D(X) corresponding to the moving position
1> is stored in the backup RAM 33 as a pinching load F(X), and this stored pinching load F(X) is used to detect when an arm, finger, etc. is caught when the windshield WG rises. It is used as a comparative value.

As a result, DC motor] and window regulator WR
Alternatively, the pinching load F(X), which sufficiently reflects aging of the rubber material of the door sash portion of the side window SW, can be used as a comparison value for pinching detection. As a result, even though the DC motor 1 and the window regulator WR may change over time and their characteristics may change,
Alternatively, even if the frictional force of the rubber material changes over time, it is possible to always compare the pinch load F(X) and motor load M(x) whose sensitivity has been adjusted according to the latest state. This makes it possible to always detect pinching accurately and with high sensitivity. Therefore, problems such as a decrease in the sensitivity of pinch detection and malfunctions will not occur. In addition, in this embodiment, the pinching load F, (X>
is set using the previously stored pinching load F (x>) before the windshield WG stops, and
The pinch load F (
) and a predetermined value AW based on the overcurrent of the DC motor 1. As a result, stable pinch detection and control can be performed without causing malfunctions due to overcurrent of the DC motor 1 due to the starting current of the DC motor 1 or static frictional force, or abnormalities in the sensitivity of pinch detection. It also has this effect.

In this embodiment, the pinch load F(x> is stored in the backup RAM 33, but it is of course possible to simply store it in the RAM 32. For the pinching load F(X) when the windshield WG is not fully open when the ignition switch IG is turned on, store the pinching load F(X) with sufficient margin in the ROM31 and use this value. At this time, when the windshield WG is fully open, the pinching load F(x) is set using the descending load D(X), as shown in this embodiment. However, from the next time onwards, the pinching load F(X) may be set using the motor load M(X) when the windshield WG rises.This allows for setting the pinching load F(X) without providing a backup RAM 33 or a power source for the backup RAM 33. It can have a simple configuration.

Furthermore, in this embodiment, the process for moving the window glass WG (steps 300, 270, 280, 310>) is configured to determine the movement position X without providing rainbow steresis. There is no problem even if the hysteresis processing used for positioning is performed.

Effects of the Invention The drive device with overload protection device of the present invention compares the load of the drive means with a comparison value learned during movement of the opening covering material. As a result, if, for example, an arm or finger is caught when the opening covering material is closed, the entrapment will be detected based on a comparison value that fully reflects the aging of the driving means, such as the motor and the opening covering material. Qin has an excellent effect of being carried out. Therefore, it has the effect of always being able to accurately and sensitively detect overloads, that is, pinching, etc., and as a result, problems such as a decrease in the sensitivity of pinch detection and malfunctions do not occur. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the basic configuration of a drive device with an overload protection device of the present invention; FIG. 2 is a schematic configuration diagram showing the configuration of a drive device with an overload protection device according to an embodiment of the present invention; 3
Figures 4 and 5 (A>, (B), (C) are ECU
6 and 7 are graphs illustrating the motor load M(X) with respect to the movement position X, respectively. 1...DC motor 2...Forward rotation relay 3...Reverse rotation relay 4...Load detection circuit 10...Electronic control unit (ECU) 12...Window part BAT...Battery IG・...Ignition switch R1...Resistor SW...Side window WG...Window glass

Claims (4)

[Claims] (1) A driving means for opening and closing an opening covering material that covers an opening, a load detecting means for detecting a load on the driving means when the driving means opens and closes the opening covering material, and a load detecting means for detecting a load on the driving means when the opening covering material is opened and closed by the driving means; a comparison value learning means for learning a comparison value used for detecting an overload of the driving means based on the detected load of the driving means when the opening covering material moves; When the aperture covering material moves, a comparison means compares the detected load value of the drive means with the learned comparison value, and the comparison means compares the load value of the drive means detected by the comparison means. A drive device with an overload protection device, comprising: drive stop means for stopping the drive means when it is determined that the drive means is larger than the above value. (2) The comparison value learning means learns the comparison value when the opening covering material moves in the opening direction, and the comparing means performs the comparison when the opening covering material moves in the closing direction. A drive device with an overload protection device according to claim 1. (3) The overload protection according to claim 1 or 2, wherein the comparison value learning means, when starting the drive means, learns the comparison value based on the comparison value learned before stopping. Drive with device. (4) When the driving means is activated, the comparison means uses a value based on the previously learned comparison value and the load value detected at the time of activation as the comparison value. A drive device with an overload protection device according to item 2 or 3.