JPH07107345B2 - Drive device with overload protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drive device with an overload protection device, and
The present invention relates to a drive device with an overload protection device that prevents an accident such as opening and closing of an opening covering material of an opening, for example, 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 device" disclosed in JP-A-59-83218 and "motor drive device" disclosed in JP-A-59-172924. Inventions and proposals of "overload protection drive device" and the like are known.

In these inventions and proposals, for example, the load level of the drive of the motor that opens and closes the windshield of the side window of the vehicle is detected, and when the load level becomes larger than a predetermined level, the side window is raised when the windshield rises. It is determined that an arm or the like is caught in the wind, and the drive of the motor is stopped, or the wind glass is lowered by rotating the motor in the reverse direction. Further, a predetermined load level corresponding to a predetermined position of the windshield is stored in advance in a semiconductor memory or the like, and the side wind is pinched by comparing the load level with the load level of driving the motor. More precise control such as detection is also performed.

[Problems to be Solved by the Invention] These inventions and proposals can accurately detect that an object is caught in a side window or the like, and may cause an injury or death as a result of an arm or neck being caught. Although it has an excellent effect of preventing accidents, the following problems still remain. That is, in these drive devices with an overload protection device, the judgment level used for detecting overload is set in advance, so that the occurrence of overload may not be accurate depending on the secular change of the power system that drives the opening covering material. It was thought that it was impossible to judge. For example, in a drive unit that opens and closes the windshield of a vehicle, its friction coefficient increases due to deterioration of the rubber material of the door sash pressed against the windshield, rusting of the wind regulator, dust adhesion, and exhaustion of the lubricant. Therefore, the load on the drive device is increased, and this may be erroneously detected as an overload. Therefore, it is necessary to adjust the judgment level in order to always accurately detect the overload. In addition, when the load is lightened due to overhaul etc., the overload detection sensitivity will be decreased, and it is possible that the pinch of the arm etc. cannot be detected sufficiently. It was thought that readjustment would be necessary.

Configuration of the Invention [Means for Solving the Problems] The configuration of the drive device with an overload protection device of the present invention for solving the above problems is as follows. That is, the drive device with an overload protection device of the present invention has a drive means (M2) for opening and closing an opening covering material (M1) for covering an opening and a drive means (M2) for driving the drive as shown in FIG. Load detection means (M) for detecting the load of the drive means (M2) when the opening cover (M1) is opened and closed by the means (M2)
3) and the opening cover (M) driven by the driving means (M2).
When 1) moves in the closing direction, a comparison means (M5) for comparing the detected load value of the drive means (M2) with a predetermined comparison value, and the above-mentioned drive means (M2) driven Opening cover (M
When 1) moves in the opening direction, the comparison value setting means (M4) for setting and updating the comparison value based on the detected load of the driving means (M2) and the detection by the comparison means (M5). Drive means (M
When it is determined that the load value in 2) is larger than the comparison value, the drive stopping means (M6) for stopping the driving means (M2) is provided.

Here, the opening covering material (M1) that covers the opening means, for example, a side window of a vehicle (a driver seat door window, a passenger seat door window, a driver seat rear door window, a passenger seat rear door window). window)
Various types of glass such as the wind glass and the sunroof roof panel are conceivable, and the invention is not limited to the vehicle.

The drive means (M2) is for opening and closing the opening covering material (M1), and may be a motor in an electric type or an air cylinder or a hydraulic cylinder in a pressure type. The opening cover member (M1) which is opened and closed by the driving means (M2) may be opened or closed by a slide type or a tilt type.

The load detecting means (M3) for detecting the load of the driving means (M2) may have any structure as long as it can detect the load of the driving means (M2). It is conceivable that the air cylinder, the hydraulic cylinder, or the like is configured to measure the amount of air or oil for control of the air cylinder, or to directly detect the torque of each drive unit (M2).

The comparison value setting means (M4) means the driving means (M2) detected by the load detecting means (M3) when the opening covering material (M1) is moved in the opening direction by being driven by the driving means (M2). It is a means for setting and updating the comparison value used for detecting the overload of the driving means (M2) based on the load, and can be configured by using a semiconductor memory, a magnetic tape or the like.
The learned comparison value is also based on the load of the driving means (M2) detected at each position where the opening covering material (M1) moves, and also as a value corresponding to each moving position of the opening covering material (M1). Alternatively, it may be a value based on the maximum load or average load of the drive means (M2) detected when the opening covering (M1) moves. Further, the comparison value may be configured to restart from a predetermined initial value each time the ignition switch or the like of the vehicle is turned on, or the comparison value is stored and stored even after the ignition switch or the like is turned off by using a non-volatile memory or the like. It may be configured to restart from the value. In addition, the update of this comparison value
Needless to say, this is not executed, for example, when the comparison means (M5) detects an overload of the drive means (M2).

The comparison means (M5) is the value of the detected load of the drive means (M2) and the set comparison value when the opening cover (M1) moves in the closing direction driven by the drive means (M2). It is conceivable that the circuit is configured as a discrete circuit using a comparator or the like, or as a logical operation circuit together with the comparison value setting means (M4) and the like. The comparison means (M5) is the comparison value setting means (M4)
From the viewpoint of safety, it is preferable to use a preset initial value as a comparison value until the first setting is performed.

The drive stopping means (M6) for stopping the driving means (M2) is
When the magnitude relationship between the detected load value of the driving means (M2) and the set comparison value is compared by the comparison means (M5) and it is determined that the detected load value is larger than the comparison value, the driving is performed. It is a means for forcibly stopping the means (M2), and may be configured to stop the operation of the driving means (M2) by outputting a stop signal to the driving means (M2). Incidentally, after the driving means (M2) is stopped, the opening covering material (M1) may be moved by a predetermined amount by rotating the driving means (M2) in the reverse direction, and the overload due to the entrapment may be eliminated. Of course.

[Operation] The drive device with the overload protection device of the present invention operates as follows.

The drive device with an overload protection device of the present invention comprises a drive means (M2)
The opening cover (M1) that covers the opening is opened and closed by
When the opening covering member (M1) is moved in the opening direction by being driven by the driving means (M2), the value based on the load of the driving means (M2) detected by the load detecting means (M3) is compared with the comparison value setting means ( Set and update as a comparison value by M4), and drive means (M
When the opening cover (M1) moves in the closing direction driven by 2), the load value of the drive means (M2) detected by the load detection means (M3) and the comparison value setting means (M4) are set. The comparison means (M5) compares the magnitude relationship with the compared value, and as a result of the comparison, when it is determined that the detected load value of the driving means (M2) is larger than the learned comparison value, The drive stop means (M6) works to forcibly stop the operation of the drive means (M2).

[Embodiment] Next, a preferred embodiment will be described with reference to the drawings in order to further clarify the 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.

As shown in the figure, the drive device with an overload protection device of the present embodiment is for opening and closing the wind glass WG of a vehicle side window (hereinafter also simply referred to as a window) SW, and includes a window regulator WR and a window regulator WR. regulator
DC motor 1 as a drive source of WR, forward rotation relay 2 that normally rotates DC motor 1 in the ON state, reverse rotation relay 3 that reversely rotates DC motor 1 in the ON state (forward rotation relay 2, reverse rotation relay) 3 is not turned on at the same time), a load detection circuit 4 for detecting a load applied to the DC motor 1, a windshield position sensor 6 for detecting a moving position X of the windshield WG, an occupant of the windshield WG
It is composed of a window glass position setter 8 which is operated when deciding the position, an electronic control unit (hereinafter simply referred to as an ECU) 10 which controls opening and closing of the window glass WG, and the like.
The drive device with the overload protection device of the present embodiment is supplied with power from the battery BAT mounted on the vehicle through the ignition switch IG. Further, in this embodiment, the side window SW, the window regulator WR, the DC motor 1, the window glass position sensor 6, the window glass position setter 8 and the like are collectively referred to as the window portion 12.

The load detection circuit 4 is composed of a resistor R1 and a differential amplifier 14, and converts a load current I flowing through the DC motor 1 into a voltage by the resistor R1 (the value of the resistor R1 is very small). The voltage drop due to the resistor R1 is detected by being amplified by the differential amplifier 14.

The windshield position sensor 6 is composed of a potentiometer and the like, and outputs the movement of the position of the windshield WG as a voltage change. In this embodiment, the output voltage increases as the position of the window glass WG rises.

The wind glass position setter 8 is composed of a slide type variable resistor, and is set by the occupant.
Corresponding to the position of the WG, the higher the set position, the higher the voltage generated.

ECU10 is a well-known CPU30, ROM31, RAM32, backup RAM33
And an output circuit 35, an input circuit 36, etc., are connected to each other by a bus 37 as a logical operation circuit.

The output circuit 35 is connected to the forward rotation driver 40 and the reverse rotation driver 41 so as to be output respectively. Forward rotation driver
40 and the reverse rotation driver 41 are respectively the forward rotation relays described above.
2, connected to the reverse rotation relay 3, wind glass WG
The output circuit 35 sets the output signal to the forward rotation driver 40 to the high level when raising the, and the output circuit 35 sets the output signal to the reverse rotation driver 41 to the high level when lowering the window glass WG. This allows wind glass
When the WG is raised, the forward rotation relay 2 is turned on, the reverse rotation relay 3 is turned off, and the load (driving) current I of the DC motor 1 is transferred from the make contact 2a of the forward rotation relay 2 to the DC motor 1. , The DC motor 1 flows 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 to rotate the DC motor 1 in the forward direction (second
It is shown as current Ia in the figure. ) Conversely, when lowering the window glass WG, the forward rotation relay 2 is in the OFF state,
The reverse rotation relay 3 is turned on, and the load current I of the DC motor 1 causes the load contact I of the reverse rotation relay 3 to the DC motor 1 and from the DC motor 1 to the break contact 2b of the forward rotation relay 2 and the break contact. 2b to the resistor R1 to rotate the DC motor 1 in the reverse direction (shown as current Ib in FIG. 2).

On the other hand, to the input circuit 36, the differential amplifier 14 of the load detection circuit 4, the window glass position sensor 6 of the window 12 and the window glass position setter 8 are connected via the A / D converter 42, respectively. ing. As a result, the ECU 10 controls 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 windshield WG output by the windshield position setter 8. Wind glass based on each input value such as set position SP
The movement position X of the WG is preferably controlled.

Next, the operation of the ECU 10 will be described with reference to the flowcharts shown in FIGS. 3, 4, and 5 (A) to (C).

The flowcharts shown in FIG. 3, FIG. 4, and FIG. 5 (A) to (C) represent “overload protection processing” executed by the ECU 10. First, when the ignition switch IG is turned on, the processing is executed from step 100. In step 100, so-called initial setting for returning the values of various flags, which will be described later, stored in the RAM 32 to the initial values is executed. Upon completion of this initialization, the process proceeds to step 110.

In step 110, the CPU 30 reads the pinching load F (x) stored in the backup RAM 33, and writes the read pinching load F (x) in the RAM 32. The pinching load F (x) will be described with reference to the graph shown in FIG.

The graph shown in FIG. 6 shows a motor load M (x) output from the differential amplifier 14 based on the load current I flowing in the DC motor 1 with the horizontal position of the movement position X of the window glass WG output from the window glass position sensor 6. ) On the vertical axis,
The solid line U (x) is the broken line D (x) when the windshield is rising.
Shows the level of the motor load M (x) with respect to the moving position X when the windshield is descending. (Hereinafter, the solid line U (x) is referred to as an ascending load U (x), and the broken line D (x) is referred to as a descending load D (x)). The alternate long and short dash line F (x) represents the pinching load F (x), which is the falling load D (X) multiplied by a predetermined value Z (Z> 1). This is to be compared with the motor load M (x) at the time of rising in the step described later.

The moving position x is a value obtained by A / D converting the voltage output from the window glass position sensor 6 by the A / D converter 42 so that the window glass WG becomes 1 in the fully opened state and 100 in the fully closed state. The position of the windshield is expressed as a 100-divided digital value x, and the larger the value x, the higher the position of the windshield WG.

As can be seen from this graph, generally, the motor load M
The level of (x) greatly changes depending on the position of the window glass WG due to the difference in gear efficiency of the window regulator WR. Also, the graph of the falling load D (x) and the rising load U
The shape of the graph in (x) is very similar, but the levels are different. The difference between the descending load D (x) and the ascending load U (x) is that even if the efficiency of the window regulator WR is almost the same at the time of descending and ascending, various frictional forces such as those of the wind glass WG and the window SW are obtained. Frictional force with the rubber material of the door sash part, wind glass WG and window regulator
This is because the conditions affected by the weight of the WR and the like are different when descending and when ascending. However, from this graph, the down load D with respect to the moving position x of the windshield WG
It is understood that if the level of (x) is known, the level of the increased load U (x) can be estimated unless an overload such as an object being caught in the window SW is applied to the DC motor 1. Accordingly, in this embodiment, the descending load D corresponding to the moving position x of the windshield WG when the windshield WG descends.
The pinching load F (x) of the window is determined using (x), and this pinching load F (x) is stored in the backup RAM 33. (Performed in steps described below). Here, in the state where the moving position x of the windshield WG is closed so that small objects such as fingers are not caught (moving position x> FE), as shown in the graph of FIG. The value is large enough. This is because the wind glass WG approached the fully closed state and became overloaded,
This is because it is not determined by mistake that an object is caught in the window SW.

In the present embodiment, the pinching load F (x) is a value obtained by multiplying the falling load D (x) by a predetermined value Z (Z> 1), but if the value is based on the falling load D (x). Any value can be used, for example, a predetermined value for the falling load D (x)
It may be a value obtained by adding Z1 (Z1> 0), or may be a value obtained by adding a predetermined value Z1 to a value obtained by multiplying the falling load D (x) by a predetermined value Z.

When the process of writing the trapping load F (x) in the RAM 32 in step 110 is completed, the process proceeds to the next step.

The subsequent processing from step 120 is actually performed by the wind glass W.
This is a process for controlling the operation of G.

First, in step 120, the setting position SP of the window glass WG output from the window glass position setter 8, the window glass position sensor 6, and the differential amplifier 14, the window glass moving position x, the motor load M of the DC motor 1 ( Each analog signal (x) is A / D converted by the A / D converter 42, and the A / D converted value is stored in the RAM 32 as a digital value. Here, the setting position SP is 1, when the window glass WG is fully opened, as in the moving position x described above.
It is a digital value that is set to 100 at the fully closed position. Further, the motor load M (x) indicates the load level of the DC motor 1 with respect to the moving position x of the windshield WG, and its value increases as the load current I increases, regardless of whether the DC motor 1 rotates forward or backward. Also grows.

In the following step 130, it is determined whether or not there is a change in the set position SP set by the occupant in the window glass position setter 8.
That is, in step 120, the previously stored set position SP
It is determined whether there is a change between the set position SP read this time and the set position SP read this time. Here, when the occupant operates the windshield position setting device 8 and it is determined that the setting position SP has changed, the value of an overload flag OF, which will be described later, is reset to a value 0 (step 140), and If it is determined that the set position SP has not changed, the process directly proceeds to the next step 150.

In step 150, it is determined whether or not the moving position x is lower than a position FE which is sufficiently closed so that a part of the limb of the occupant can no longer be caught in the window SW. this is,
This is because if the moving position x is located above the position FE, the object will not be pinched by the window SW. Here, when the movement position x ≦ FE is satisfied, it is determined whether or not the window glass WG is currently descending (step 160). This determination is performed by determining the value of the descending flag DF which is set to 1 when the window glass WG descends in the process described later.

When the descending graph DF = 1, the process proceeds to the descending process DRT, and when not DF = 1, the process proceeds to the ascending process URT. The processing performed by the descending process DRT and the ascending process URT will be described with reference to the graph of FIG.

The graph shown in Fig. 7 is similar to the graph shown in Fig. 6, but the wind glass WG is fully lowered and raised.
The descending load D (x), the ascending load U (x), and the pinching load F when the product is stopped in the middle of fully closing and then descended and raised again.
Each of (x) is shown. Here, the position where the descent starts is represented by DP and the position where the descent starts is represented by UP,
Hereinafter, the descent start position DP and the ascending start position UP are simply called.

In the descending process DRT, first, the motor load M (x) during descending
Is set as the descending load level D (x) corresponding to the moving position x of the windshield WG (step 170).
Subsequently, the movement position x is a predetermined movement amount from the descent start position DP.
It is determined whether or not it is larger than the value obtained by subtracting CW (step 180). If it is determined that the movement position x> DP-CW is established, the process proceeds to step 190, and if it is determined that it is not established, the process proceeds to step 200.

In step 190, the descending load D (DP + 1) immediately before the windshield WG is stopped is multiplied by a predetermined value Z, and in step 200, the descending load D (x) being descended is multiplied by a predetermined value Z. , And is stored in the backup RAM 33 as the pinching load F (x). This is for the following reason.

As shown in the graph of the down load D (x) in FIG. 7, from the state that the windshield WG is stopped at the moving position x = DP, the value of the down load D (x) is zero level, When the DC load is lowered, an overcurrent due to the motor starting current, static friction force, etc. flows in the DC motor 1. Therefore, if the pinching load F (x) is determined based on the descent load D (DP) at the stop position, the overload level is determined. Is relatively low, which causes malfunctions and the like. Therefore, until the windshield WG starts to work stably, that is, until the moving position x = DP-CW, which is not affected by the motor starting current, the static friction force, etc., is passed, the descending load D (DP + 1) just before the stop is generated. ) Is used to calculate the entrapment load F (x). As a result, the position of the moving position x changes from the descent start position DP to the position DP-
In the range up to CW, the value of the pinching load F (x) is 7th
It becomes a constant value as shown in the graph of the figure. The pinching load F (x) at the time of the descent start is, for example, the descent load D (DP
+1) and the down load D where the windshield moves stably
It is also possible to assume a straight line connecting (DP-CW) and set based on this assumed value.

On the other hand, in the ascending process URT, first, it is determined whether or not the moving position x is smaller than a value obtained by adding a predetermined moving amount BW to the ascending start position UP when ascending (step 210). Moving position x
<UP + BW is determined, in step 215, the trapping load F stored corresponding to the moving position x.
After the value obtained by adding the predetermined load DW based on the overcurrent at the time of starting the motor to (x) is set as the sandwiching load F (x),
If it is determined that the condition is not satisfied, the process directly proceeds to step 220. This is for the following reason.

As shown in the graph of rising load U (x) in FIG. 7, from the state in which the windshield WG is stopped at the moving position x = UP [the value of rising load U (x) is zero level], As in the case of descending, when it is increased, an overcurrent due to the motor starting current, static friction force, etc. flows, so that the pinching load F (x) stored in the backup RAM 33 remains as it is for comparison with the motor load M (x). This is because there is a risk of malfunction. Therefore, until the window glass WG starts to move stably (UP <movement position x <UP + BW), 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 compared. The target of.

In step 220, the pinching load F (x) stored in the backup RAM or the pinching load F (x) calculated in step 215 is compared with the motor load M (x) when the windshield WG is raised. There is. This is for determining that an arm, a finger or the like has been caught in the window SW when the motor load M (x) at the time of rising exceeds the set pinching load F (x). Here, if it is determined that the motor load M (x)> F (x) is satisfied, the process proceeds to step 230, and if it is determined that the condition is not satisfied, the ascending process URT is ended.

In step 230, the overload flag OF when an object is caught in the window SW is set to a value of 1, and for safety, the position of the window glass WG is moved by a predetermined movement amount AW from the movement position x where the object is caught. The position for lowering is MP (hereinafter,
It is stored as a protection position MP).

When the descending process DRT and the ascending process URT described above are completed, the process proceeds to step 250. In the present embodiment, the period for setting the pinching load F (x) at the start of descending and ascending is set to the period in which the wind glass WG moves by the predetermined amounts CW and BW, respectively. It may be possible to set a predetermined delay time by a program or the like.

In the following step 250, the value of the overload flag OF is determined. That is, when it is determined that the overload flag OF = 1 is established,
The next protection process SRT (steps 260 to 280) is executed. This protection processing SRT is processing for lowering the moving 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 compared. Here, if it is determined that the movement position x> MP is established, the process proceeds to step 270, and if it is determined that it is not established, the process proceeds to step 280. The “wind glass lowering process” performed in step 270 is a process for lowering the wind glass WG, and the “wind glass stopping process” performed in step 280 is a process for stopping the wind glass WG ( Details will be described later). Protective treatment of steps 260-280
The SRT is continuously executed until the windshield position setting device 8 is operated by the occupant, the setting position SP is changed, and the value of the overload flag OF is reset to 0 (steps 130 and 140). As a result, the window glass WG is lowered by the predetermined amount AW from the position where it is determined that the 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 OF = 1 is not established, and the process proceeds to step 300 and subsequent steps to match the moving position x of the windshield WG with the set position SP. Process for.
If it is determined in step 150 that the moving position x> FE is satisfied, there is no concern of trapping, and therefore the above-described steps 160 to 280 are not executed, and the same processing is performed after step 300. Proceed to.

First, in step 300, the magnitude relationship between the movement position x and the set position SP is determined. That is, the process proceeds to step 270 when it is determined that the moving position x> SP, to step 280 when it is determined to be the moving position x = SP, and to step 310 when it is determined that the moving position x <SP. This step 2
The "window glass descending process", "window glass stopping process", and "window glass rising process" of 70, 280 and 310 will be described with reference to the flow charts of FIGS. 5 (A) to 5 (C).

The “window glass descending process” executes the process shown in the flowchart of FIG. First, at step 350, the value of the descending flag DF is determined. When it is determined that the descending flag DF = 1 is satisfied, it is determined that the windshield WG is already descending, and the process skips to "RETURN".
When it is determined that the condition is not satisfied, the processes of steps 360 to 380 are executed.

In step 360, the descent process is started, and the process of setting the values of the up flag UF and the down flag DF to 0 and 1 is performed. When the value 1 is set in the ascending flag UF and the descending flag DF, it indicates that the value is rising and the value is falling. Next, a process of storing the current movement position x as the descent start position DP in the RAM 32 is performed (step 37).
0). In the following step 380, the output signal of the reverse rotation driver 41 is set to the high level via the output circuit 35 in order to rotate the DC motor 1 in the reverse direction and lower the window glass WG. As a result, the value of the falling flag DF is 1
During this period, the Wind Glass WG continues to descend.

The "window glass stop process" executes the process shown in the flowchart of FIG. 5 (B). That is, in step 390, it is determined that the moving position x has reached the set position SP, and the rising flag is set.
The UF and the descending flag DF are reset to 0 respectively, and in the following step 400, the output signals of the forward rotation driver 40 and the reverse rotation driver 41 are set to the low level via the output circuit 35 in order to stop the DC motor 1. Done. As a result, the DC motor 1 is stopped.

The "window glass rising 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. If it is determined that the rising flag UF = 1 is satisfied, the window glass WG has already been lifted, and the process skips to "RETURN". If it is determined that the condition is not satisfied, the processes of steps 420 to 440 are executed.

In step 420, the rising process is started, and the processes of setting the values of the rising flag UF and the falling flag DF to 1 and 0 are performed. Next, the current movement position x is set as the ascending start position UP
A process of storing in RAM 32 is performed (step 430). In the following step 440, in order to rotate the DC motor 1 in the forward direction to raise the window glass WG, the output signal of the forward rotation driver 40 is set to the high level via the output circuit 35. As a result, while the value of the ascending flag UF is 1, the wind glass WG continues to ascend.

By executing the processing of steps 300, 270, 280 and 310, the window glass WG is lowered or raised to the set position SP and stopped at the set position SP.

As described above, according to the drive device with the overload protection device of the present embodiment described in detail, every time the window glass WG descends, the descending load D (x) corresponding to the moving position x has a predetermined value Z (Z> Z).
The product of 1) is stored in the backup RAM 33 as the sandwiching load F (x), and the stored sandwiching load F (x) is stored.
(X) is a comparison value for detecting that an arm, finger, or the like is caught when the windshield WG is raised. Thus, the pinching load F (x) that sufficiently reflects the secular change of the rubber material or the like of the door sash portion of the DC motor 1, the window regulator WR, or the side window SW can be used as a comparative value for pinching detection. As a result, even if the DC motor 1 and the window regulator WR change over time and their characteristics change, or if the frictional force changes due to the change over time of the rubber material, etc. The pinching load F (x) whose sensitivity is adjusted according to the state can be compared with the motor load M (x), and pinching can always be detected accurately and with high sensitivity. Therefore, there is no possibility that the sensitivity of the trapping detection is lowered or a malfunction such as a malfunction occurs. Further, in the present embodiment, the pinching load F (x) when the windshield WG is started to descend is set to the previously stored pinching load F before the windshield WG is stopped.
Entrapment load F, which is set using (x) and is compared with motor load M (x) when the windshield WG is started to rise.
(X) is a value obtained by adding a predetermined value DW based on the overcurrent of the DC motor 1 to the stored sandwiching load F (x). As a result, stable entrapment detection and control can be performed without causing malfunction due to overcurrent of the DC motor 1 due to the starting current of the DC motor 1, static frictional force, or the like, or abnormal sensitivity of entrapment detection. It also has the effect.

In this embodiment, the sandwiching load F (x) is stored in the backup RAM 33, but it is simply RAM 32.
It goes without saying that it may be configured to memorize in the above case. In this case, the pinching load F (x) when the window glass WG is not in the fully closed state when the ignition switch IG is turned on is sufficient. Entrapment load F with a margin
It is conceivable to store (x) in the ROM 31 and use this value. As a result, a simple configuration can be achieved without providing the backup RAM 33, the backup RAM 33 power supply, or the like.

Further, in the present embodiment, the movement position x is determined without providing hysteresis in the process (steps 300, 270, 280, 310) for moving the windshield WG.
There is no problem even if the hysteresis process conventionally used for positioning the wind glass is performed.

Advantageous Effects of Invention In the drive device with an overload protection device of the present invention, when the opening covering member that covers the opening portion moves in the direction of closing the opening portion, a predetermined comparison value is compared with the load of the driving means to prevent overload. The load is detected and the comparative value is set and updated when the opening covering moves in the direction to open the opening.

In this way, since the comparison value is updated every time the opening covering material moves in the opening direction, the characteristics of the supporting member of the opening covering material and the driving means change over time, and the frictional force etc. changes to drive. Even if the required load current changes, the comparison value according to the present state is always set.

Therefore, according to the present invention, since the determination is performed by using the comparison value set by sufficiently reflecting the current state of the device,
It is possible to always accurately and sensitively determine the overload state of the drive unit due to the trapping or the like.

Further, usually, the pinching of a finger, arm, or the like occurs when the opening covering material moves in the direction of closing the opening.
By performing the update and determining the overload state when the opening cover is closed, the control is simpler than the device that makes the comparison value setting, update and overload determination without distinction when the opening cover is opened and closed. Therefore, high-speed control can be realized.

Further, the comparison value set based on the load of the driving means detected by the load detecting means is set and updated only when the opening covering material that does not cause a pinch or the like is opened. At times, even if the driving means is overloaded due to pinching or the like, it is not affected at all, and accurate and highly sensitive determination can always be performed.

That is, in the case of the device that updates the comparison value even when the opening cover is closed, if it is determined that the comparison value is in the overload state, the update of the comparison value and the like are stopped, but the state is in the overload state. Immediately before the determination, the comparison value is continuously updated on the basis of the load of the driving unit affected by the influence, so that the comparison value having a higher level than that in the normal state is set. Therefore, when closing the opening covering that may cause pinching etc., only the overload is judged and the comparison value is not updated. Is not affected by this and can always make accurate and sensitive judgments.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the basic configuration of a drive unit with an overload protection device according to the present invention, and FIG. 2 is a schematic configuration diagram showing the configuration of a drive unit with an overload protection device according to an embodiment of the present invention. Three
Fig. 4, Fig. 4 and Fig. 5 (A), (B), (C) show the ECU 10.
FIG. 6 and FIG. 7 are flowcharts showing the “overload protection processing” executed by the above, and graphs each exemplifying the motor load M (x) with respect to the moving position x. 1 ... DC motor 2 ... Forward rotation relay 3 ... Reverse rotation relay 4 ... Load detection circuit 10 ... Electronic control unit (ECU) 12 ... Window BAT ... Battery IG ... Ignition switch R1 ... Resistance Vessel SW …… Side window WG …… Wind glass WR …… Wind regulator

Claims (3)

[Claims] 1. A drive means for opening and closing an opening covering material for covering an opening, a load detecting means for detecting a load of the driving means when the driving means opens and closes the opening covering material, and a driving means for driving the opening covering material. When the opening covering material is moved in the closing direction, the comparing means compares the detected load value of the driving means with a predetermined comparison value, and the opening covering material is opened by being driven by the driving means. When moving in the direction, the comparison value setting means for setting and updating the comparison value based on the detected load of the drive means, and the value of the load of the drive means detected by the comparison means is smaller than the comparison value. A drive device with an overload protection device, comprising: drive stop means for stopping the drive means when it is determined to be large. 2. The overload protection device according to claim 1, wherein the comparison value setting means updates the comparison value on the basis of the comparison value set before stopping when the drive means is activated. Drive device. 3. The comparison means, when starting the driving means, uses as the comparison value a value based on the comparison value currently set and the load value detected at the time of starting. Alternatively, the drive device with the overload protection device according to the second aspect.