JPH08128259A - Window opening and closing control device - Google Patents

Abstract

PURPOSE: To renew a threshold value for judging a foreign matter nipping to an optimum value at real time according to the kaleidoscopic change of the operating state of a motor, in the process for closing a window, and use the renewed threshold at real time. CONSTITUTION: When a Hall element 40 outputs pulse signals according to the rotation of a motor M during the closing operation of a window, a microcomputer 50 sets a threshold for judging a foreign matter nipping on the basis of the period corresponding to the output interval of the pulse signals from the Hall element 40. Then, the microcomputer 50 compares the change ratio of the period corresponding to the output interval of the pulse signals from the Hall element 40 with a set threshold during the closing operation of the window. According to the comparison result, the presence of the foreign matter nipping of the window is judged. The drive of the motor M during the closing operation of the window is controlled according to it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window opening / closing control device suitable for controlling opening / closing of a vehicle window and other various windows.

[0002]

2. Description of the Related Art Conventionally, for example, in a window opening / closing control apparatus for an automobile, a change rate of a drive current of a motor for driving the window and a change rate of a period of a detection pulse with respect to rotation of the motor are set in a predetermined process. When the rate of change is reached, it is configured to stop the closing operation of the window by determining that the foreign matter is caught.

[0003]

However, according to such a window opening / closing control device, even if the rate of change of the drive current and the period of the detection pulse as described above varies depending on the use environment and the use state of the window. Regardless, the above-mentioned predetermined rate of change, that is, the threshold value, which is a criterion for entrapment of foreign matter, remains constant.

For this reason, it is not possible to sufficiently cope with fluctuations in the operating characteristics of the motor according to the operating environment and operating conditions of the window, and it is erroneously determined that a foreign object is caught even though the foreign object is not caught. There is a possibility that the window may malfunction due to a false determination that a foreign object is not caught even though the window is caught. For this, JP-A-61
As in the window opening / closing control device disclosed in Japanese Patent No. 649482, in addition to reversing and opening the window when the foreign matter is caught, as an example that affects the environment in which the window is used, the outer peripheral edge of the window and the window frame The increase in the load current of the motor due to the increase in the friction resistance with the weatherstrip attached to the vehicle is taken.Measures are taken to prevent the misjudgment that the foreign matter is caught when the load current is increased. Has been.

Specifically, when a load current exceeding a threshold value is detected in the process of closing the window,
The threshold is increased and updated by reversing the window and adding a predetermined amount of current to the threshold. However, according to this, since the predetermined amount of current added to the threshold value has nothing to do with the use environment and use state of the window, depending on the value of this predetermined amount of current, as in the case described above, the window It may not be able to sufficiently cope with the fluctuation of the operating characteristics of the motor according to the use environment or the use state, which may lead to erroneous determination.

Further, as described above, the increase of the threshold value is updated after the inversion operation of the window. Therefore, when the threshold value is updated and updated, the window may always perform an erroneous operation of inverting. Therefore, this causes discomfort to the user. Further, in the power window device disclosed in Japanese Utility Model Laid-Open No. 62-203392, a pulse generated from a pulse generation circuit in accordance with the rotation of the motor, that is, a pulse representing the operating characteristic of the motor is fetched into a microcomputer to determine the rotation speed of the motor. The rate of change is detected and compared with the threshold value. Then, the opening / closing control of the window is performed based on the comparison determination result.

In this case, the rotational speed change rate changes due to external factors, that is, fluctuations in the operating characteristics of the motor due to changes in the operating environment and operating conditions of the window, such as power supply voltage, temperature, and vehicle speed. If you leave the value constant,
This may cause the window to malfunction. Therefore, as a method of preventing this malfunction, the power supply voltage, the temperature, and the vehicle speed that cause the malfunction are detected, and the threshold value is changed according to the detection result.

However, in reality, the number of rotations of the motor is not limited to the independent change of the power supply voltage, the temperature or the vehicle speed, and
It is also affected by at least two synergistic changes in power supply voltage, temperature and vehicle speed. Moreover, the power supply voltage,
The motor rotation speed characteristic affected by a synergistic change in temperature or vehicle speed is different from the motor rotation speed characteristic affected by an independent change in power supply voltage, temperature, or vehicle speed.

In other words, the updating of the threshold value by any one of the power supply voltage, the temperature and the vehicle speed is not performed by utilizing the direct physical phenomenon of the motor rotation speed characteristic, but the power supply voltage, the air temperature or the vehicle speed. This is only done by utilizing the indirect physical phenomenon. Therefore, the update of the threshold value that does not consider the influence of the synergistic change in at least two of the power supply voltage, the air temperature, and the vehicle speed correctly reflects the cycle of the pulse from the pulse generation circuit, that is, the rotation speed of the motor. It does not become a thing. As a result, even if the foreign matter entrapment is determined on the basis of such an update threshold value, there is a possibility that an erroneous determination will occur as described above.

Further, the threshold value is changed based on the power supply voltage, the temperature and the vehicle speed immediately after the window starts to rise. Here, for example, the power supply voltage immediately after the start of the window in the fully open state, the temperature and the vehicle speed, and the power supply voltage after that, the temperature and the vehicle speed often differ due to changes in the usage state of the window. Therefore, even if the presence or absence of trapping in the subsequent window rising process is determined by the threshold value changed based on the power supply voltage, the temperature, or the vehicle speed immediately after the window in the fully open state starts to rise, an erroneous determination may occur. There is.

Note that it is difficult to create data in consideration of synergistic changes of at least two of the above-mentioned physical phenomena such as power supply voltage, air temperature, vehicle speed, etc. in relation to the rotational speed characteristic of the motor. . From the above, the present inventors have
We focused on the fact that if the threshold value is updated directly based on the operating characteristics of the motor, for example, the cycle or the number of revolutions, the foreign matter can be pinched accurately regardless of changes in physical phenomena such as the power supply voltage.

In view of the above, the present invention provides a window opening / closing control apparatus that sets a threshold value for determining foreign object entrapment in the process of closing a window according to the momentary change of the operating state of the motor. The purpose is to update to an optimum value in real time and use this update threshold value in real time.

[0013]

In order to solve the above problems, in the invention described in claim 1, a driving means (2) for driving the window (12) to open and close by a motor (M).
0, 60), operating state detecting means (40) for detecting the operating state of the motor (M), and foreign matter based on changes in the operating state detected by the operating state detecting means (40) during the closing operation of the window (12). The threshold value setting means (141, 142) for setting the threshold value for the entrapment determination and the change in the detected operating state of the operating state detecting means (40) are compared with the set threshold value. Depending on the window (1
Judgment means (15) for judging the presence / absence of the foreign matter trapped in 2)
0) and the control means (151, 151) for controlling the drive of the motor (M) by the drive means (20, 60) during the closing operation of the window (12) based on the determination result of this determination means.
111) and a window opening / closing control device are provided.

According to a second aspect of the present invention, in the window opening / closing control device according to the first aspect, the operating state detecting means (40) detects the rotational cycle of the motor (M). 40, 141) and the threshold value setting means (141, 142) sets the threshold value based on the detected rotation cycle of the rotation cycle detection means (40, 141) during the closing operation of the window (12). The determination means (150) compares the set threshold value with the change in the detected rotation cycle of the rotation cycle detection means (40, 141).

According to the third aspect of the invention, in the window opening / closing control device according to the second aspect, a plurality of change ranges of the detected rotation cycle of the rotation cycle detecting means (40, 141) and the respective ranges are respectively corresponded. A threshold value setting means (1) is provided with a storage means (50) for pre-storing predetermined data representing a relationship with a plurality of threshold values for foreign matter entrapment determination.
41, 142) reads from the predetermined data one of a plurality of change ranges of the detected rotation cycle to which the detected rotation cycle of the rotation cycle detection means (40, 141) during the closing operation of the window (12) belongs, The threshold value corresponding to the selected change range is read from the predetermined data, and the determination means (150) compares the read threshold value with the change in the detected rotation cycle of the rotation cycle detection means (40, 141). It is characterized in that whether or not the foreign matter is caught in the window (12) is determined.

According to a fourth aspect of the present invention, in the window opening / closing control device according to the first aspect, the operating state detecting means (40) detects the rotational speed of the motor (M) ( 40) and threshold setting means (1
41, 142) sets the threshold value based on the rotation speed detected by the rotation speed detection means (40) during the closing operation of the window (12), and the determination means (150) sets the threshold value to the set threshold value. It is characterized in that the comparison is performed with the change in the detected rotation speed of the rotation speed detection means (40).

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0018]

According to the first aspect of the invention, when the operating state detecting means (40) detects the operating state of the motor (M) during the closing operation of the window (12), the threshold value is set. Means (141, 142) set the threshold value based on the change in the detected operating state of the operating state detecting means (40). Then, during the closing operation of the window (12), the determination means (150) causes the operating state detection means (4).
The change in the detection operation state of 0) is compared with the set threshold value, and the presence or absence of the foreign matter trapped in the window (12) is determined according to the comparison result. Then, the control means (151,
111) drive means (20, during the closing operation of the window (12) based on the determination result of the determination means (150).
The drive of the motor (M) by 60) is controlled.

As described above, the threshold value is set based on the change of the operating state of the motor (M), the foreign matter is caught by comparing the change of the operating state of the motor (M) with the threshold value, and this determination is made. Result-based drive means (20, 60)
The drive control of the motor (M) is performed in real time during the closing operation of the window (12) as described above.

Therefore, before the threshold value is set, the window (12) does not malfunction, and the window (12) is appropriately controlled in a timely manner in accordance with the change in the operating state of the motor (M) which changes every moment. Is possible. In such a case, since the threshold value is set in real time in direct correspondence to the change in the operating state of the motor (M), it is possible to prevent an erroneous determination as to whether the window (12) is pinched.

Further, even if the operating state of the motor changes due to a change in frictional resistance between the weather strip of the window frame and the weather strip during the closing operation due to various causes such as secular change and temperature change of the window frame. Since the threshold value that matches the change is set, the above erroneous determination can be prevented. Further, according to the invention described in claim 2, the rotation cycle detecting means (40, 141) detects the rotation cycle of the motor (M),
The threshold value setting means (141, 142) detects the rotation cycle detecting means (40, 14) during the closing operation of the window (12).
The threshold value is set based on the detected rotation cycle of 1), and the determination means (150) compares it with the set threshold value to change the detected rotation cycle of the rotation cycle detection means (40, 141). To and from.

As a result, even when the operating state of the motor (M) is the rotation cycle of the motor (M), it is possible to achieve the same function and effect as the invention described in claim 1. According to the invention of claim 3, the threshold value setting means (141, 14
2) stores one of a plurality of change ranges of the detected rotation cycle to which the detected rotation cycle of the rotation cycle detection means (40, 141) during the closing operation of the window (12) belongs.
0), the threshold value corresponding to the selected change range is read from the predetermined data, and the determining means (150) determines the read threshold value and the rotation cycle detecting means (40, 141). The presence or absence of foreign matter trapped in the window (12) is determined by comparison with the change in the detected rotation cycle in (4).

As described above, the threshold value corresponding to the change range of the rotation cycle of the motor is read from the storage means and used as a reference for the determination by the determination means. Therefore, when the rotation cycle of the motor changes while the window is rising, the threshold value is read again from the storage means (50) in response to the change, and is used as the reference for the above determination. Therefore, it is possible to set the optimum threshold value in real time according to the motor operating state while the window is rising, and as a result, it is possible to effectively prevent erroneous determination.

According to the fourth aspect of the invention, the rotation speed detecting means (40) detects the rotation speed of the motor (M), and the threshold value setting means (141, 142) causes the window (12). ), The threshold value is set on the basis of the detected rotation speed of the rotation speed detection means (40), and the determination means (150) compares the set threshold value with the rotation speed detection means. This is performed between the change in the detected rotation speed in (40).

As a result, even when the operating state of the motor (M) is the number of rotations of the motor (M), it is possible to achieve the same function and effect as the invention described in claim 1.

[0026]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an example in which the present invention is applied to a vehicle window opening / closing control device. In FIG.
Reference numeral 10 indicates a door of the automobile, and a window 12 is attached to a window frame 11 of the door 10 so as to be openable and closable. In such a case, the window 12 closes as it rises, while it opens as it descends.

A weather strip 13 is attached to the inner peripheral edge of the window frame 11, and the weather strip 13 is configured to sandwich the outer peripheral edge portion of the window 12. The structure of the weather strip 13 is not limited to this, and may be a weather strip configured to be in close contact with the outer peripheral edge of the window 12 from the outside of the vehicle.

The window opening / closing control device includes a drive mechanism 20.
The drive mechanism 20 raises or lowers the window 12 in accordance with the forward or reverse rotation of the motor M. As shown in FIG. 1, the window opening / closing control device includes an operation switch 30 and a hall element 40, a microcomputer 50 connected to the operation switch 30 and the hall element 40, and the microcomputer 50.
Drive circuit 60 connected to the.

The operation switch 30 generates a closing operation signal for closing the window 12 by its operation. Further, the operation switch 30 generates an open operation signal for opening the window 12 by its operation. Hall element 4
0 detects the rotation of the motor M and generates a pulse signal. The power supply circuit 50a is directly connected to the battery B when the device of the present invention is mounted on the vehicle, and constantly generates a constant voltage.

The microcomputer 50 has a power supply circuit 5
0a receives a constant voltage and becomes the operating state.
The main control program is executed in accordance with the flowchart shown in FIG. 5, and the interrupt control program is executed in accordance with the flowchart shown in FIG. In such a case, during execution of the main control program, opening / closing control of the window 12
The rate of change of the period of the pulse signal from the Hall element 40 and other arithmetic processing are performed. Further, during the execution of the interrupt control program, the position of the window 12 and the period of the pulse signal from the Hall element 40 are calculated.

In the present embodiment, the microcomputer 50 has a built-in position counter for calculating the position of the window 12. The position counter is initialized when the constant voltage of the power supply circuit 50a is generated, and thereafter, the counting operation is always performed. in this case,
The counting range of the position counter corresponds to the rotation range of the motor M corresponding to the entire range between the fully open position and the fully closed position of the window 12.

Then, the increment counting operation of the position counter is performed based on the determination that the motor M is normally rotated based on the closing operation signal from the operation switch 30, that is, the window 12 is closed. On the other hand, the reverse rotation of the motor M based on the opening operation signal from the operation switch 30, that is, the window 1
Based on the determination of the opening operation of No. 2, the decrement counting operation of the position counter is performed. Therefore, the increment count value or the decrement count value of the position counter corresponds to the closed position or the open position of the window 12.

When the ignition switch IG of the automobile is turned on, the drive circuit 60 receives a direct current voltage from the battery B to be in an operating state, and under the control of the microcomputer 50, the motor M is rotated normally or reversely via the drive mechanism 20. Drive to drive. Hereinafter, the operation of this embodiment configured as described above will be described.

The microcomputer 50 has a power supply circuit 5
Upon receiving the constant voltage from 0a, the main control program is repeatedly executed according to the flowcharts of FIGS. In such a state, step 10 in FIG.
At 0, interrupts are enabled. If there is no output from the operation switch 30, steps 110 and 16
The determination of NO at 0 is repeated.

When the ignition switch IG is turned on, the battery B supplies the drive circuit 60 with a DC voltage. At this time, it is assumed that the window 12 is in a fully opened state. If a closing operation signal is generated from the operation switch 30 at such a stage, it is determined in step 110 that the window 12 is requested to be lifted.
Judged as ES.

Then, in step 111, a rising signal for raising the window 12 is output. Therefore, the drive circuit 60 causes the drive mechanism 20 to operate based on the rising signal.
The motor M is driven via the, and the window 12 starts to close due to its rise. At this time, the hall element 40 detects the rotation of the motor M and sequentially outputs pulse signals. Therefore, under the interrupt permission in step 100,
In response to the pulse signal from the hall element 40, execution of the interrupt control program is started according to the flowchart of FIG. Then, in step 200, it is determined that the window 12 is in the closing operation state based on the closing operation signal from the operation switch 30. Then step 21
At 0, the position counter performs the increment counting operation based on the detection pulse signal output from the Hall element 40.

After that, in step 220, the interrupt timing by the detection pulse signal from the Hall element 40 this time is counted by the free running counter built in the microcomputer 12, and this count value is registered in the microcomputer 50. Stored in. The counting by the free running counter is started when the microcomputer 50 starts operating.

The execution of the interrupt control program as described above is repeated each time a pulse signal is output from the Hall element 40, the count value of the position counter increases with the closing of the window 12, and the free running counter is also used. The interrupt generation interval, that is, the cycle of the pulse signal (corresponding to the rotation cycle of the motor M) is calculated from the difference between the preceding value and the subsequent value of the count value of, and is stored in the internal register of the microcomputer 50.

After the arithmetic processing in step 111 as described above, in step 112, the position of the window 12 is read based on the count value of the position counter in step 220 of the interrupt control program. At this stage, since the window 12 has just begun to rise from the fully opened position, step 1 is performed based on the read position.
When NO is determined in step 20, step 130 is performed based on the closing operation signal from the operation switch 30.
Is determined to be YES.

Then, in step 140, it is determined whether or not the position of the window 12 is within a range in which foreign matter may be caught (hereinafter referred to as a pinchable range). At this stage, the window 12 has just begun to rise from the fully opened position, so that a determination of YES is made in step 140 based on the count value of the position counter. After that,
In step 141, the cycle of the pulse signal is read from the register, and in step 142, the relationship between the cycle range ΔTi and the threshold value (hereinafter referred to as threshold value mi) shown in Table 1 below based on the read cycle. The threshold value mi is read from the predetermined data representing

[0041]

[Table 1] This Table 1 is used as follows. As shown in FIG. 6, of the cycles stored in the above register, the preceding cycle and the subsequent cycle subsequent thereto are represented by tp and tf, respectively. Then, the threshold period mi corresponding to the period range ΔTi to which the subsequent period tf belongs is selected based on the fact that the subsequent period tf becomes longer than the preceding period tp due to the entrapment of foreign matter. For example, ΔTi = 6.7 m
If s or more and less than 7.5 ms, the threshold value m2 is selected.

Further, the predetermined data in Table 1 above is defined as follows. It is assumed that the cycle change rate α is expressed by the following equation 1 using the preceding cycle tp and the subsequent cycle tf.

[0043]

[Mathematical formula-see original document] α = tp / tf Here, if foreign matter is trapped by the window 12, the subsequent cycle tf becomes longer than the preceding cycle tp due to the decrease in the rotation speed of the motor M, and the cycle change rate α decreases. Therefore, it can be seen that the presence / absence of a foreign substance can be determined based on the presence / absence of a decrease in the cycle change rate α.

Therefore, the period range Δ to which the subsequent period tf belongs
Ti (i = 1, 2, 3, ...) Is set, and a threshold value mi (i = 1, 1, 2) corresponding to this period range ΔTi is set.
2, 3 ...) are set as shown in Table 1. In such a case, the period range ΔTi and the threshold value mi corresponding to each other
Is determined so as to directly correspond to the fluctuation of the rotation cycle of the motor M, and the fluctuation of the rotation cycle of the motor M due to the entrapment of foreign matter can be discriminated from the fluctuation of the rotation cycle of the motor M based on the friction resistance change caused by the weather strip 13. Has been.
Further, the longer (or shorter) the subsequent period tf belonging to the period range ΔTi, the smaller (or larger) the threshold value mi. The threshold mi is i
It becomes so small that the value of increases. Also,
The predetermined data is stored in advance in the ROM of the microcomputer 50.

Therefore, in step 142, the threshold value mi corresponding to the period range ΔTi to which it belongs is read from the predetermined data in Table 1 based on the latest subsequent period tf in the register. In the next step 143, the cycle change rate α is calculated from the equation (1) based on the latest preceding cycle tp and subsequent cycle tf in the register.

Then, the period change rate α thus calculated is compared with the read threshold value mi in step 142 in step 150. If the rate of cycle change α is smaller than the threshold value mi by this comparison, YES is determined in step 150 based on the determination that foreign matter is trapped. Therefore, in step 151, the down signal is output to invert the window 12. Along with this, the motor M is driven by the drive circuit 60 to lower the window 12. This allows
It is possible to eliminate foreign matter (see reference numeral A in FIG. 2).

In such a case, the period range ΔT corresponding to each other
i and the threshold value mi directly correspond to the rotation cycle of the motor M as described above, and the fluctuation of the rotation cycle of the motor M due to the entrapment of foreign matter is changed by the change of the friction resistance of the weatherstrip 13. It is specified so that it can be identified. Therefore, in the process of closing the window, the threshold value for determining the presence of the foreign matter is updated to the optimum value in real time according to the change in the operating state of the motor, and this updated threshold value is used in real time. . For this reason, proper control according to the presence / absence of the foreign matter trapped in the window can be performed with good timing without causing an erroneous determination regarding the foreign matter trapping.

Further, in the above window closing operation process, when the count value of the position counter in step 112 becomes a value corresponding to the fully closed position of the window 12, the determination in step 120 becomes YES and step 121. Output of the rising signal stops. As a result, the raising operation of the window 12 is stopped by stopping the motor M.

When an opening operation signal is output from the operation switch 30 in such a closed state of the window 12,
After the determination of NO in step 110, step 16
In 0, YES is determined. Then step 16
At 1, a down signal for lowering the window 12 is output. This causes the window 12 to descend as described above. At this stage, the window 12 is determined to be in the opening operation in step 200 of FIG. 5 based on the opening operation signal from the operation switch 30, and the decrement counting operation of the position counter is performed in step 210.

Then, when the read count value of the position counter in step 162 reaches a value corresponding to the fully opened position of the window 12, it is determined to be YES in step 170, and the output of the descending signal is stopped in step 121. To be done. As a result, the lowering operation of the window 12 is stopped by stopping the motor M. FIG. 7 shows a modification of the above embodiment. In this modification, a part of the flow chart (see FIG. 4) described in the above embodiment is shown in FIG.
Has been changed as shown in. Other configurations are the same as those in the above embodiment.

In this modified example having such a configuration,
If YES is determined in step 140 as in the above embodiment, the cycle of the pulse signal is read from the register of the microcomputer 50 in step 141. Next, in step 141a, the rotation speed of the motor M is calculated based on the pulse signal from the Hall element 40. Then, the threshold value ni is read from predetermined data (hereinafter referred to as second predetermined data) representing the relationship between the rotation speed range .DELTA.Ni and the threshold value ni based on the calculated rotation speed.

However, the second predetermined data is adopted in place of the predetermined data described in the above embodiment, the rotation speed range ΔNi corresponds to the cycle range ΔTi, and the threshold value n
i corresponds to the threshold value mi. In such a case, the rotation speed range ΔNi and the threshold value ni corresponding to each other are determined in consideration of the fact that the rotation cycle of the motor M is inversely proportional to the rotation speed. Further, the higher the number of revolutions included in the revolution range .DELTA.Ni, the larger the threshold value ni. In addition,
The threshold value ni is increased as i is increased.

Thus, in step 142a,
The rotation speed range .DELTA.Ni to which the rotation speed of the motor M corresponding to the latest subsequent cycle tf in the register belongs is selected from the second predetermined data, and the threshold value ni corresponding thereto is read from the second constant data. . Next step 143a
In the same way as in the above-mentioned formula of 1, the rotational speed change rate β
Is calculated based on the latest preceding rotational speed Np and subsequent rotational speed Nf in the register. Then, the rotational speed change rate β calculated in this way is
A comparison is made with the read threshold value ni in step 142. In such a case, the rotation speed change rate β is equal to the threshold value ni.
If it is larger than the above, it is determined to be YES in step 150a based on the determination that the foreign matter is caught.

As a result, this modification can also achieve the same effects as the above embodiment. In addition,
In implementing the present invention, instead of the Hall element 40,
A detector that detects the rotation speed, rotation angle, drive current, etc. of the motor M may be adopted and implemented. Further, in the above embodiment, an example in which the present invention is applied to a window opening / closing control device for an automobile door has been described, but the present invention is not limited to this, and the present invention is applied to a window opening / closing control device for various vehicles and ships. You may carry out. In this case, the opening / closing direction of the window is not limited to the vertical direction, but may be the lateral opening / closing direction.

In implementing the present invention, the threshold value in the above embodiment is not limited to the rate of change of the rotation cycle of the motor M, but may be the cycle of rotation itself. . In the above embodiment,
Although the rise of the window 12 is determined based on the output from the operation switch 30, instead of this, for example,
Another Hall element 40 may be adopted, and the rise of the window 12 may be determined based on whether the phase difference between the outputs of the Hall elements 40 is positive or negative.

Further, in carrying out the present invention, the period change rate α'in which the denominator and the numerator of the period change rate α are reversed may be adopted instead of the period change rate α. In this case, when the period change rate α'becomes large, the foreign matter is caught. The same applies to the rotation speed change rate β. Further, each step in each flow chart of the above-described embodiment may be realized by a hard logic configuration as a function executing means.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a side view of a window of an automobile door to which the present invention is applied.

3 is a front part of a flowchart showing a main control program executed by the microcomputer of FIG. 1. FIG.

4 is a latter part of a flow chart showing a main control program executed by the microcomputer of FIG.

5 is a flowchart showing an interrupt control program executed by the microcomputer of FIG.

FIG. 6 is a time chart showing an output waveform of the Hall element of FIG.

FIG. 7 is a main part flowchart showing a modified example of the embodiment.

[Explanation of symbols]

12 ... Window, 20 ... Drive mechanism, 40 ...
・ Hall element, 50 ・ ・ ・ Microcomputer, 60
... Drive circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Terashima 1-1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (4)

[Claims] 1. A drive means for opening and closing a window by a motor, an operating state detecting means for detecting an operating state of the motor, and a change in an operating state detected by the operating state detecting means during a closing operation of the window. A threshold value setting means for setting a threshold value for determining whether or not a foreign matter is caught, and a change in the detected operating state of the operating state detecting means is compared with the set threshold value. A window opening / closing control device comprising: a determination unit that determines whether or not a foreign matter is trapped; and a control unit that controls the drive of the motor by the drive unit during the closing operation of the window based on the determination result of the determination unit. 2. The operating state detection means is a rotation cycle detection means for detecting a rotation cycle of the motor, and the threshold value setting means is a rotation detected by the rotation cycle detection means during a closing operation of the window. 2. The threshold value is set based on a cycle, and the determination means compares the set threshold value with a change in the detected rotation cycle of the rotation cycle detection means. The window opening / closing control device described in. 3. Storage means for storing in advance predetermined data representing a relationship between a plurality of change ranges of the detected rotation cycle of said rotation cycle detection means and a plurality of threshold values corresponding to these change ranges, respectively. The threshold value setting means reads one of a plurality of change ranges of the detected rotation cycle to which the detected rotation cycle of the rotation cycle detection means during the closing operation of the window belongs from the predetermined data, and selects the range. The threshold value corresponding to the change range is read from the predetermined data, and the determination unit compares the read threshold value with the change in the detected rotation cycle of the rotation cycle detection unit to determine whether or not the foreign matter is caught in the window. The window opening / closing control device according to claim 2, wherein the determination is performed. 4. The operating state detection means is a rotation speed detection means for detecting the rotation speed of the motor, and the threshold value setting means is a rotation detected by the rotation speed detection means during the closing operation of the window. 2. The threshold value is set on the basis of a number, and the determination means compares the set threshold value with a change in the rotational speed detected by the rotational speed detection means. The window opening / closing control device described in.