JPH0921273A - Opening/closing control device for opening/closing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely take opening/closing actions by providing current/voltage detecting circuits detecting the current/voltage of a motor, a current change quantity calculating program, a power change quantity calculating program, and a comparing program. SOLUTION: When one of an up switch 7a, a down switch 7b, and an automatic switch 7c is turned on, the on-signal is inputted to a microcomputer 2 via an interface 9. The control signal is outputted to a motor driving circuit 4 based on the input signal, and the driving circuit 4 rotates a motor forward or backward. When insertion occurs, a load is applied to the motor 3, the current is increased, and the voltage is lowered. The microcomputer 2 checks whether the current change quantity exceeds a threshold value or not and whether the power change quantity exceeds a threshold value or not to detect the insertion. The microcomputer calculates the change quantities with a circuit 20 based on current/power change quantity calculating programs 22a, 22b and compares them with the threshold values. Proper opening/closing actions can be taken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing control device for an opening / closing body that detects a pinch of a hand or the like during an opening / closing operation of the opening / closing body such as a window / door and operates the opening / closing body safely.

[0002]

2. Description of the Related Art In recent years, an opening / closing control device called a power window, which automatically opens / closes a window or the like by a switch operation of an operator using a motor, has been standardized in vehicles.
In order to prevent an accident such as a foreign object such as a hand or an arm being caught during the closing operation, the conventional opening / closing control device detects whether or not the foreign object is caught during the closing operation and stops the driving of the motor. It is known to have been made. For example, in the device disclosed in Japanese Examined Patent Publication No. 2-6648, the motor current is monitored, and when it is detected that the current value exceeds a threshold value, it is determined that pinching has occurred, and the motor operation is determined. By stopping or reversing, foreign objects such as hands and arms are prevented from being caught. Also, to prevent misjudgment of an increase in the load current to the motor that occurs at the fully closed position of the power window as a change in current due to jamming, a fully closed position detection means such as a limit switch is provided to detect jamming at the fully closed position. I try not to.

[0003]

However, in the conventional opening / closing control device as described above, since only the electric current of the motor is monitored to detect the trapping, it is possible to drive other electronic devices in the vehicle. When the power supply voltage fluctuates, the current of the motor fluctuates accordingly, and when the power supply voltage increases, the motor current may increase and false detection of entrapment may occur. It is also known that trapping is detected by monitoring the motor rotation speed and the occurrence of trapping is judged when the motor rotation speed falls below a threshold value, but only the motor rotation speed is known. In order to detect the entrapment, the rotation speed of the motor may decrease with a decrease in the power supply voltage, and the entrapment may be erroneously detected as described above. The present invention has been made to solve the above-described problems, and by monitoring the current of a motor and the amount of change in electric power calculated from the amount of change in current and the amount of change in voltage. , Erroneous detection of entrapment, that is, when an object such as a hand or arm is not entrapped in the window, an increase in the motor current or a decrease in the motor rotation speed due to an increase in the power supply voltage occurs. An object of the present invention is to provide an opening / closing control device for an opening / closing body, which can prevent erroneous detection, properly detect pinching of a hand or arm, and perform a safe opening / closing operation.

[0004]

In order to achieve the above object, an opening / closing control device for an opening / closing body according to the invention of claim 1 controls opening / closing of an opening / closing body such as a window / door by driving a motor. A device for detecting a current of a motor, a voltage detection unit for detecting a voltage of the motor, a current change amount calculation unit for calculating a current change amount based on an output of the current detection unit, and a current detection unit. Means and a power change amount calculating means for calculating a power change amount based on the outputs of the voltage detecting means, and a comparing means for comparing the current change amount and the power change amount calculated by each calculating means with a predetermined threshold value, respectively. When the current change amount and the power change amount are equal to or more than a predetermined threshold value as a result of the comparison, the motor is stopped or reversed. The opening / closing control device for an opening / closing body according to a second aspect of the present invention is an opening / closing control device for an opening / closing body that controls opening / closing of an opening / closing body such as a window or a door by driving a motor, the current detecting means detecting a current of the motor. A voltage detection means for detecting the voltage of the motor, a power change amount calculation means for calculating a power change amount based on the outputs of the current detection means and the voltage detection means, a current value of the motor detected by the current detection means, and And comparing means for comparing the power change amount calculated by the power change amount calculating means with a predetermined threshold value, respectively, and as a result of the comparison, if the current value of the motor and the power change amount are equal to or more than the predetermined threshold values, respectively. First, the motor is stopped or reversed. The opening / closing control device for an opening / closing body according to a third aspect of the present invention is an opening / closing control device for an opening / closing body for controlling opening / closing of an opening / closing body such as a window / door by driving a motor, and a current for detecting a current change amount of the motor. A change amount detection means, a rotation speed change amount detection means for detecting a change amount of the rotation speed of the motor, and a comparison for comparing the current change amount and the rotation speed change amount detected by each detection means with a predetermined threshold value. And a means for stopping or reversing the motor when the amount of change in current and the amount of change in rotational speed are equal to or greater than predetermined threshold values as a result of comparison. A power window system according to a fourth aspect of the present invention is a system using the opening / closing control device for an opening / closing body according to any one of the first to third aspects, in which a motor is operated by operating an operation switch. It is driven to open / close a window as an opening / closing body.

[0005]

In the opening / closing control device for an opening / closing body according to claim 1 having the above-mentioned structure, the current change amount calculating means calculates the current change amount based on the output of the current detecting means, and the power change amount calculating means detects the change amount. The amount of change in power is calculated based on the current and voltage of the motor, and the amount of change in current and the amount of change in power are compared with the respective threshold values by the comparison means, and the comparison result is greater than or equal to the predetermined threshold value. If so, stop or reverse the motor. In this way, since the amount of change in current and the amount of change in power are used as the detection conditions for pinching, pinching can be detected accurately when the current rises sharply, even if the amount of voltage change is small. Can be detected quickly.

Further, in the opening / closing control device of the opening / closing body according to the present invention, the power change amount calculating means calculates the power change amount based on the detected motor current and voltage, and the motor current value and power change. The quantities are compared with respective predetermined threshold values by the comparing means, and when the comparison results are equal to or higher than the predetermined threshold values, the motor is stopped or reversed. In this way, since the current value of the motor and the amount of change in the electric power are used as the detection condition for pinching, the same action as above can be obtained.

Further, in the opening / closing control device for an opening / closing body according to claim 3, the current change amount detecting means detects the current change amount of the motor, and the rotation speed change amount detecting means detects the change amount of the rotation speed of the motor. The comparing means compares the current change amount and the rotational speed change amount with a predetermined threshold value, and when the comparison result is equal to or more than the predetermined threshold value, the motor is stopped or reversed. In this way, since the trapping detection condition is based on the current change amount and the motor rotation speed change amount, it is possible to obtain the same effect as the above.

Further, in the power window system according to the present invention, the window can be opened and closed by driving the motor by operating the operation switch, and the trapping of the foreign matter is detected during the window closing operation as described above. Because
It is possible to prevent erroneous detection of trapping.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an opening / closing control device for an opening / closing body. In this embodiment, the opening / closing body control device is mounted on a power window system of an automobile, and appropriately detects a foreign object such as a hand or an arm when the power window is closed to reduce malfunction. The opening / closing body control device 1 receives a signal from an operation switch or the like of a power window that is an opening / closing body to operate each circuit, and at the same time, processes a signal from each circuit to process a signal to control the automatic raising and lowering of the power window.
(Hereinafter referred to as the microcomputer 2), a motor drive circuit 4 for driving the motor 3 for raising and lowering the power window in the forward and reverse directions based on a control signal from the microcomputer 2, and a current detection circuit 5 for detecting the current of the motor 3. And a voltage detection circuit 6 for detecting the voltage of the motor 3, an operation switch 7 for operating the power window, and a limit switch 8 which is turned on when the power window reaches a predetermined closed position during the closing operation. .

The microcomputer 2 includes an arithmetic circuit 20 and a RAM 21.
And a ROM 22 and the like, and the ROM 22 uses a current change amount calculation program 22a for calculating a current change amount based on the detection output of the current detection circuit 5 and an output from the current detection circuit 5 and the voltage detection circuit 6 to generate power. A power change amount calculation program 22b for calculating the change amount and a comparison program 22c for comparing the current change amount by the current change amount calculation program 22a and the power change amount by the power change amount calculation program 22b with a predetermined threshold value are provided. doing.

The operation switch 7 includes an up switch 7a which is operated when the power window is closed, a down switch 7b which is operated when the power window is opened, and the operation knob of the switch is stopped when these switches are operated for a predetermined stroke or more. It is provided with an auto switch 7c for continuing the operation. The switching signal of the operation switch 7 is input to the microcomputer 2 via the input interface (I / F) 9.

The limit switch 8 is for preventing an increase in the load current to the motor generated at the fully closed position of the power window from being erroneously determined as a current change when a foreign object such as a hand or arm is caught. The limit switch 8 is turned on at a position slightly before the window is fully closed when the window is closed, and thereafter, the limit switch 8 is set at the fully closed position so that the trapping is not detected. The ON / OFF signal of the limit switch 8 is input to the microcomputer 2 via the input interface 10.

Next, the operation of the opening / closing body control device 1 having the above configuration will be described. In the ascending / descending operation of the power window, when any one of the up switch 7a, the down switch 7b, and the auto switch 7c is turned on by the stroke operation of the operation knob, this ON signal is input to the microcomputer 2 via the input interface 9, The microcomputer 2 outputs a control signal to the motor drive circuit 4 based on the input signal, and the motor drive circuit 4 rotates the motor 3 forward or backward based on the control signal. The microcomputer 2 detects when a foreign object in the hand or arm is caught in the power window during the closing operation of the power window, and stops or reverses the motor 3.
The operation of determining the entrapment will be described below.

2A and 2B are waveform diagrams showing changes in voltage, current, etc. at the time of starting and pinching. FIG. 2A is a current I and voltage V of the motor 3, and FIG. 2B is a current change amount and a voltage change amount. , (C) shows the amount of change in electric power, and (d) shows the rotational speed and the amount of change in rotational speed, respectively. The microcomputer 2 does not detect entrapment for a certain period of time when the power window is activated. When pinching occurs, a load is applied to the motor 3 and the current I increases and the voltage V decreases. At this time, the microcomputer 2
It is checked whether the current change amount shown in (b) exceeds the threshold value B, and further, the power change amount shown in FIG.
It is checked whether or not it has crossed over to detect entrapment.

When the power supply voltage fluctuates due to the driving of another electronic device in the vehicle, the current to the motor fluctuates accordingly, and when the power supply voltage increases, the motor current increases and it is erroneously detected as a pinch. It may happen. FIG.
FIG. 4 is a waveform diagram showing changes in voltage and current when the power supply voltage changes, (a) current I and voltage V of the motor 3, (b) current change amount and voltage change amount, and (c) power change. amount,
(D) shows the rotation speed and the rotation speed change amount, respectively.
If the power supply voltage fluctuates due to the driving of electronic components of the automobile while the motor 3 is being driven, the motor 3 is driven as shown in FIG.
Similarly, the voltage V of the same changes, and when the voltage rises, the motor current increases accordingly. At this time, since entrapment does not actually occur, it is necessary to prevent entrapment from being detected. Similarly, even when it is determined that entrapment has occurred when the rotation speed of the motor has decreased, the rotation speed of the motor decreases as the power supply voltage decreases, so it is necessary to prevent erroneous detection of entrapment.

Therefore, in the opening / closing body control device 1 of the present embodiment, the microcomputer 2 controls the current I and voltage V of the motor 3 detected by the current detection circuit 5 and the voltage detection circuit 6 as A /
The amount of change in current ((b) of FIG. 2 and (b) of FIG. 3) is calculated in the arithmetic circuit 20 from the D conversion value based on the current change calculation program 22a, and the power change calculation program 22b is calculated.
The amount of change in power ((c) of FIG. 2 and (c) of FIG. 3) is calculated by the arithmetic circuit 20 based on the above, and these calculation results are compared with a predetermined threshold value based on the comparison program 22c. Then, when the value is equal to or more than the threshold value, it is determined that the trapping occurs. Then, when the power supply voltage fluctuates (increases), the amount of change in power swings in the negative direction as shown in FIG.

An example of the processing procedure by the microcomputer 2 will be described with reference to the flowchart of FIG. This processing corresponds to claim 1. The microcomputer 2 checks whether the auto switch 7c is turned on (# 1), and if it is turned on (# 1: YES), checks which of the up switch 7a or the down switch 7b is turned on (# 2),
An up or down drive control signal is output to the motor drive circuit 4 (# 3). Then, it is checked whether it is in the starting period (# 4). If it is not in the starting period (# 4: NO), the current I and the voltage V of the motor 3 detected by the current detection circuit 5 and the voltage detection circuit 6 are detected. Is read (# 5), it is checked whether the limit switch 8 is turned on (# 6), and if it is not turned on (# 6: NO), their differential values are obtained in order to obtain the amount of change in the current I and the voltage V. And the differential value of the product of the current I and the voltage V is calculated in order to obtain the amount of change in power (# 7).

Then, it is checked whether the differential value of the current I is larger than a predetermined threshold value B (# 8), and if it is larger (# 8: Y
ES), and then the electric power, that is, the differential value of the product of the voltage V and the current I is a predetermined threshold value C (criterion detection judgment standard).
Check if it is larger (# 9), and if it is larger (# 9: YE
S), it is determined that a foreign object such as a hand or an arm is caught during the closing operation of the power window, and the driving of the motor 3 is stopped or reversed (# 10). On the other hand, in # 6, if the limit switch 8 is turned on (# 6: YES), the power window has reached the fully closed position, so that when the current I exceeds the predetermined threshold value A (# 11: YES), the microcomputer 2 stops driving the motor 3 (# 12). If the current I does not exceed the threshold value A in # 11 (# 11: NO), the processes in and after # 7 are performed. Also,#
When the determinations in 8 and # 9 are NO, the process returns to # 5 and the same operation is repeated.

As described above, in the opening / closing body control device 1, when the current I and the voltage V change due to the fluctuation of the power supply voltage, the differential value of the current I exceeds the threshold value B in # 8. , # 9, if the differential value of the power does not exceed the threshold value C, it is not determined that the jamming occurs. Therefore, erroneous detection of entrapment due to fluctuations in the power supply voltage can be reduced, and proper power window raising / lowering operation can be performed.

FIG. 5 is a flow chart showing an example of another processing procedure by the microcomputer 2. This processing corresponds to claim 3. In the above embodiment, the amount of change in current and the amount of change in power are calculated, and each is compared with the threshold value to determine whether or not there is a pinch. However, in the example shown in FIG. The amount of change in rotational speed is calculated and compared with threshold values B and D, respectively. In this example, the ROM 22 of the microcomputer 2 stores a rotational speed change amount calculation program (no reference number) and the like. FIG.
, # 21 to # 26 are the same as # 1 to # 6 in FIG. 4, and in # 27, the microcomputer 2 controls the current I of the motor 3.
And the differential value of the rotation speed ω of the motor 3 are calculated. Next, in # 28, it is checked whether or not the differential value of the current I exceeds the threshold value B (# 28).
28: YES), and it is checked whether or not the differential value of the rotation speed ω exceeds the threshold value D (a criterion for the detection of entrapment) (# 2).
9) If it exceeds (# 29: YES), it is determined that the trapping has occurred, and the motor 3 is stopped or reversed. #
When the determinations at 28 and # 29 are NO, the process returns to # 25. Further, in # 26, the operations of # 31 and # 32 when the limit switch 8 is turned on are the same as those of # 11 and # in FIG.
Similar to 12.

In addition to the examples of the two methods described above, erroneous detection can also be reduced by a method of determining entrapment based on the current value of the motor 3 and the amount of change in power (corresponding to claim 2). By adopting the entrapment detection method as described above, in the conventional method of detecting the entrapment by monitoring only the motor current, the entrapment is erroneously detected due to the fluctuation of the power supply voltage or the noise, and the conventional motor is detected. In the method of determining the entrapment by monitoring the rotation speed, it is possible to solve the problem that the entrapment is erroneously detected due to the decrease of the power supply voltage, and the power window can be operated safely and appropriately.

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. Although the opening / closing body control device 1 is used in the power window of an automobile in the above-described embodiment, it may be used as an opening / closing control device of a sunroof of an automobile, or is applied to an electric shutter of a garage, a door of an elevator, or the like. It is possible.

[0023]

As described above, according to the opening / closing control device of the opening / closing body according to the inventions of claims 1 to 3, trapping of foreign matter during the closing operation of the opening / closing body causes a change in current and power of the motor. Amount, or motor current value and power change amount, or motor current change amount and rotation speed change amount are calculated, and the respective calculated values are compared with respective predetermined threshold values, and the comparison results are respectively It is detected when it becomes equal to or more than a predetermined threshold value, and when pinching is detected, the motor is stopped or reversed. Therefore, when a foreign object is caught during the closing operation of the opening / closing body, it does not remain caught, and the opening / closing body can be operated safely, and the change in the motor current due to the fluctuation of the power supply voltage is also caught. It is possible to reduce false detection of occurrence of the occurrence of the occurrence of the occurrence of the above-mentioned situation, and to appropriately perform the opening / closing operation of the opening / closing body. Further, in the past, in order to prevent erroneous detection of trapping due to the influence of voltage fluctuations and other noises, it was necessary to raise the threshold value, so there was a case where a detection delay occurred and the trapping torque increased. However, in the present invention, the threshold value can be lowered because the false detection of the trapping is reduced, and therefore the torque when the trapping occurs can be reduced.

According to the power window system of the fourth aspect, by using the opening / closing control device for the opening / closing body according to any one of the first to third aspects, it is possible to reduce The power supply voltage does not fluctuate and the trapping is not erroneously detected, and the safety of the power window system is improved.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an opening / closing control device for an opening / closing body according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of current, voltage, and the like when the opening / closing control device is activated and pinching occurs.

FIG. 3 is a waveform diagram of current, voltage and the like when the power supply voltage of the switching control device changes.

FIG. 4 is a flowchart showing a processing procedure for pinch detection of the opening / closing control device.

FIG. 5 is a flowchart showing another processing procedure of pinch detection of the opening / closing control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Open / close body control device 2 Microcomputer 3 Motor 4 Motor drive circuit 5 Current detection circuit (current detection means) 6 Voltage detection circuit (voltage detection means) 22a Current change amount calculation program (current change amount calculation means) 22b Electric power change amount calculation Program (electric power change amount calculation means) 22c Comparison program (comparison means)

Claims (4)

[Claims] 1. An opening / closing control device for opening / closing an opening / closing body such as a window / door by driving a motor, comprising: a current detecting means for detecting a current of the motor; and a voltage detecting means for detecting a voltage of the motor. A current change amount calculation unit that calculates a current change amount based on the output of the current detection unit; and a power change amount calculation unit that calculates a power change amount based on the outputs of the current detection unit and the voltage detection unit. A comparison unit that compares the amount of change in current and the amount of change in power calculated by each of the calculation units with a predetermined threshold value, and as a result of the comparison, the amount of change in current and the amount of change in power each have a predetermined value. An opening / closing control device for an opening / closing body, which stops or reverses the motor when the threshold value is exceeded. 2. An opening / closing control device for opening / closing an opening / closing body such as a window / door by driving a motor, comprising a current detecting unit for detecting a current of the motor and a voltage detecting unit for detecting a voltage of the motor. A power change amount calculating means for calculating a power change amount based on the outputs of the current detecting means and the voltage detecting means; and a motor current value detected by the current detecting means and a power change amount calculating means. Comparing means for comparing the respective amounts of power change thus obtained with a predetermined threshold value, and as a result of the comparison, if the current value and the amount of power change of the motor are respectively equal to or more than a predetermined threshold value, the motor is An opening / closing control device for an opening / closing body, which is stopped or inverted. 3. An open / close control device for opening / closing an opening / closing body such as a window / door by driving a motor, comprising: a current change amount detecting means for detecting a current change amount of the motor; Rotation speed change amount detection means for detecting the change amount, and a comparison means for comparing the current change amount and the rotation speed change amount detected by each of the detection means with a predetermined threshold value respectively, the result of the comparison, An opening / closing control device for an opening / closing body, which stops or reverses the motor when the current change amount and the rotation speed change amount are equal to or more than predetermined threshold values. 4. A system using the opening / closing control device for an opening / closing body according to any one of claims 1 to 3, wherein a motor is driven by operating an operation switch, and a window serving as the opening / closing body is opened. Power window system characterized by opening and closing.