KR20230138681A - Non-contact safety sensing apparatus - Google Patents

Abstract

When a power door using a motor is operated, the entrapment of a human body is detected in a non-contact manner, and when the power door closes adjacent to the door frame itself, the non-contact sensor detects the door frame itself to prevent malfunctions due to human entrapment. It relates to a non-contact safety sensing device, which includes a sensing unit provided on one side of a moving or fixed body and including a plurality of sensors whose basic sensor output values detected in the absence of foreign substances or human bodies have the same value, the plurality of sensors A detection unit that detects the sensor output difference value between each sensor based on the detection result detected through the sensor, and compares the sensor output difference value with a preset pinch threshold level, and determines the sensor output difference value within the preset pinch threshold level range. It includes a comparison unit that outputs a pinch signal in case of deviation, and has the effect of preventing malfunction due to detection of the door frame itself without being provided with location information of the power door.

Description

Non-contact safety sensing apparatus}

The present invention relates to a non-contact safety detection device, and more specifically, to detect the pinching of a human body in a non-contact manner when a power door using a motor is operated, and when the power door closes adjacent to the door frame itself, the non-contact sensor detects the door frame itself. It relates to a non-contact safety sensing device that can detect itself and prevent malfunctions due to human beings caught.

Recently, the application of power doors using motors has become common in many fields. These power doors are widely used in electric windows of vehicles using PTG (power tailgate), entrance doors of subways and trains using sliding doors, building entrance doors, elevator doors, screen doors, and revolving doors.

Accordingly, accidents where human bodies are pinched often occur, and various pinch prevention devices have been proposed to prevent such accidents.

A representative method among conventional jamming prevention devices is a technology that prevents jamming accidents by measuring mechanical pressure when a human body gets caught in a door and stopping the motor when the pressure exceeds 10kgf.

However, in this method, even if the same pressure is applied, there is a problem that children or the elderly, who are relatively weaker than ordinary adults, may suffer injury due to the large impact on the human body.

Therefore, recently, a technology has been proposed that uses a non-contact sensor to detect the occurrence of a human body being caught in advance before the power door touches the human body. Capacitor-type sensors are widely used as such non-contact sensors.

However, the non-contact sensor has a problem in that the sensor detects the door frame itself at the moment the power door is closed, causing a malfunction. In other words, when a power door using a non-contact sensor is installed on the door of a vehicle, the non-contact sensor detects the door frame itself, which is made of metal, at the moment the door is closed, and a malfunction may occur due to a human being caught.

To solve this problem, the detection data of the non-contact sensor according to the position of the door is stored in the absence of human access, and the saved detection data is compared with the sensor output when a human body is caught, and the A method of canceling out the influence of the door frame itself is proposed.

However, in this case, there is a problem in that the non-contact sensor must determine the location information of the door during the door closing process. In other words, the current location information of the door is received through a communication channel separate from the main CPU provided in the vehicle, and the sensor output can be compared with the reference detection data that varies depending on the received current location information to determine whether a human body is trapped. do.

Therefore, this detection method based on location information has the problem of first having to determine the location information of the door when determining whether a human body is caught, and the problem of having to store in advance standard detection data that varies depending on the vehicle type or size of the vehicle.

For example, in Patent Document 1 below, an extension flexibly installed on a panel along the bottom surface, a first extended planar conductor included in the upper part of the extension, and a central part of the extension are formed through the planar conductor and the A non-contact obstacle comprising a longitudinal cavity disposed between bottom surfaces, the first elongated planar conductor further comprising a first electrode of a detection capacitor, the longitudinal cavity comprising a dielectric portion of the detection capacitor. A flexible capacitive strip for use in a sensing system is disclosed.

As a result, the flexible capacitance strip of Patent Document 1 below can be flexibly installed on a curved surface such as a pillar, panel, or lift-gate of an automobile, and can protect the conductor from external elements such as moisture. There is a possible effect.

In addition, the flexible capacitance strip of Patent Document 1 has the advantage of being cost-effective as it can produce multiple strips that can be cut to a desired length from one process.

However, the flexible capacitance strip of Patent Document 1 below has a problem in that the sensor detects the door frame itself at the moment the power sliding door is closed, causing an error in the sensor output, which reduces the accuracy of close object detection using capacitance change detection. .

In addition, Patent Document 2 below discloses a motor for driving a vehicle window, a converter that detects ripple changes in current generated when driving the motor and converts them into a digital pulse signal, and a digital pulse signal applied from the converter. Accordingly, a window control device for an automobile is proposed that includes a microcontrol unit that determines the position information of the window and outputs a control signal to drive the motor according to the determined information.

Through this, the automobile window control device of Patent Document 2 below drives the motor according to the identified window position information, thereby preventing the anti-pinch (anti-pinch) of the automobile window without using a functionally complicated anti-pinch motor. It has the effect of implementing the Anti-Pinch function.

However, the automobile window control device of Patent Document 2 below relates to a contact-type pinch prevention device that implements an anti-pinch function when foreign substances or body parts are caught when the window glass rises, and uses a non-contact sensor. The problem of a malfunction in a power door due to the sensor detecting the door frame itself at the moment the door is closed has not been resolved.

In addition, Patent Document 2 addresses the problem of having to determine the location information of the door to prevent malfunctions that occur when the sensor detects the door frame itself at the moment the door is closed, and pre-storing standard detection data that varies depending on the vehicle type or size of the vehicle. There are still problems that need to be addressed.

Republic of Korea Patent No. 10-0622624 (announced on September 19, 2006) Republic of Korea Patent No. 10-0965431 (announced on June 25, 2010)

The purpose of the present invention is to provide a non-contact safety detection device in which a non-contact sensor detects the door frame itself in the process of closing a power door and can prevent malfunctions due to human being caught.

Another object of the present invention is to provide a non-contact safety detection device that can prevent malfunction of a human being trapped without receiving location information of the power door.

Additionally, another object of the present invention is to provide a non-contact safety detection device that can be easily installed regardless of the vehicle type or size of the vehicle.

The non-contact safety detection device according to an embodiment of the present invention for achieving this technical task relates to a non-contact safety detection device that detects the approach of a human body in a non-contact manner when operating a power door using a motor, and is located on one side of a moving or fixed body. A sensing unit including a plurality of sensors that are provided and have the same basic sensor output value detected in the absence of foreign substances or human bodies, and a sensor output difference value between each sensor based on the detection results detected through the plurality of sensors. It includes a detection unit that detects.

In addition, the non-contact safety detection device according to the present invention further includes a comparison unit that compares the sensor output difference value with a preset pinch threshold level and outputs a pinch signal when the sensor output difference value is outside the preset pinch threshold level range. do.

In addition, in the present invention, when the sensing unit is mounted on a sliding door, a plurality of sensors are installed in an up-down or left-right direction so that the basic sensor output values detected by each sensor have the same value regardless of the distance between the sliding door corresponding to the moving object and the fixed body. It is characterized by being arranged as.

In addition, in the present invention, when the sensing unit is mounted on a swing door, a plurality of sensors are configured to adjust the direction of the rotation axis of the swing door so that the basic sensor output values of each sensor detected between the swing door corresponding to the moving object and the fixed body have the same value. It is characterized by being arranged as.

In addition, in the sensing unit according to the present invention, the plurality of sensors detects the fixed body and increases the angle when each sensor mounted on the moving body detects a fixed body made of a metal component as the distance between the moving body and the fixed body becomes closer. It is characterized in that the basic sensor output value of the sensor is provided as a sensor that shows the same value depending on the position of the fixture.

In addition, in the present invention, between the sensing unit and the detection unit, there is a sensor signal equalization unit that corrects the sensor output error between each sensor based on the detection results detected through the plurality of sensors and normalizes the basic sensor output value of each sensor to have the same value. More may be included.

In addition, the non-contact safety detection device according to the present invention removes noise signals based on the sensor output difference value detected by the detection unit, or converts the sensor output difference value into an absolute value size to convert the signal-processed sensor output difference value. It further includes a sensor signal processing unit that generates a sensor signal.

In addition, in the present invention, the comparator compares the sensor output difference value processed by the sensor signal processing unit with a preset pinch threshold level value, and outputs a pinch signal when the signal processed sensor output difference value is greater than or equal to the pinch threshold level value. It is characterized by

As described above, the non-contact safety detection device according to the present invention has the effect of preventing malfunctions from occurring due to human being caught by the non-contact sensor detecting the door frame itself in the process of closing the power door.

In addition, the non-contact safety detection device according to the present invention has the effect of preventing malfunction due to detection of the door frame itself by offsetting the influence of sensor output depending on the distance between the moving object and the fixed object, thereby accurately detecting human entrapment accidents.

In addition, the non-contact safety detection device according to the present invention has the effect of reducing the price through simplification of the human entrapment prevention device by resolving detection errors without receiving location information of the power door.

In addition, the non-contact safety detection device according to the present invention can be installed without interlocking with the main CPU that provides location information of the power door, so it can be easily installed regardless of the vehicle type or size of the vehicle.

1 is a configuration diagram showing a non-contact safety detection device according to an embodiment of the present invention.
Figure 2 is a block diagram showing a non-contact safety detection device according to an embodiment of the present invention.
FIG. 3 is a block diagram showing the sensing unit in FIG. 2 in detail.
Figure 4 is a diagram for explaining a sensing unit mounted on a sliding door.
Figures 5a and 5b are diagrams for explaining a sensing unit mounted on a sliding or swinging door.
Figure 6 is a block diagram showing the sensor board in Figure 3 in detail.
Figure 7 is a diagram for explaining the sensor output of the non-contact safety detection device according to an embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings.

The same reference numerals in each drawing indicate the same members.

Figure 1 is a configuration diagram showing a non-contact safety detection device according to an embodiment of the present invention, Figure 2 is a block diagram showing a non-contact safety detection device according to an embodiment of the present invention, and Figure 3 is a sensing unit (100) in Figure 2. ) is a block diagram showing in detail.

The non-contact safety detection device 10 according to an embodiment of the present invention is mounted on one side of the moving body 1 or the fixed body 2 when applying a power door using a motor 4 and prevents the human body 3 from being caught in a non-contact manner. Detected as

The non-contact safety detection device 10 of the present invention can be applied to various technical fields that move the moving object 1 through the electric motor 4. For example, the non-contact safety detection device 10 of the present invention may be applied to an electric automatic opening and closing system that can automatically open and close the side doors, trunk doors, windows, and sunroof of a vehicle as an electric window of a vehicle.

In addition, the non-contact safety detection device 10 of the present invention can be applied to entrance doors of subways and trains using a sliding door method, building entrance doors, elevator doors, elevator doors, revolving doors, etc.

In addition, the non-contact safety detection device 10 according to an embodiment of the present invention is provided on one side of the mobile body 1 or the fixed body 2, as shown in FIGS. 1 and 2, to prevent the human body 3 from approaching without contact. It includes a sensing unit 100 that detects a sensor board 200 and a sensor board 200 that outputs a pinch signal based on the detection result of the sensing unit 100.

In addition, in the present invention, the sensing unit 100 includes a plurality of sensors whose basic sensor outputs sensed in the absence of the human body 3 have the same value as shown in FIG. 3. That is, the plurality of sensors are provided with basic sensor output values that are the same regardless of the distance between the moving object 1 and the fixed object 2.

Here, the basic sensor output value represents the sensor output value detected by the sensor in a state where there is no approach of the human body 3 between the moving object 1 and the fixed object 2.

In addition, in the present invention, the sensing unit 100 is installed on the moving body 1 close to the fixed body 2 and can detect the human body 3 in a non-contact manner through a change in capacitance according to the approach of the human body 3. there is.

In general, non-contact sensors used in human entrapment prevention devices detect the door frame itself (21) made of metal during the power door closing process, so the distance between the moving body (1) and the fixed body (2) is close. As this happens, the sensor output value increases.

For example, when the sensor is mounted on the vehicle door 11 and the door 11 is open and the sensor is far away from the door frame itself 21, the sensor output shows a basic sensor output value close to 0 (Zero). .

Here, the vehicle door 11 may correspond to the moving body 1, and the door frame itself 21 may correspond to the fixed body 2.

However, as the door 11 approaches the door frame itself 21, the sensor detects the door frame itself 21 made of metal, and the position of the vehicle door 11 becomes relative to the door frame itself 21. The sensor output increases.

Therefore, in this case, if the pinch threshold level for determining whether the human body 3 is caught is set to a constant level, a pinch (human body trapped) error occurs due to the influence of the door frame itself 21 detected in the process of closing the door 11. occurs.

That is, as the position of the vehicle door 11 approaches the door frame itself 21, the sensor detects the door frame itself 21 and the increased basic sensor output value becomes greater than the pinch threshold level, so that the human body 3 An error occurs in which the pinch signal is output even when there is no access.

To solve this problem, the sensing unit 100 of the present invention includes a plurality of sensors whose basic sensor output values are the same regardless of the distance between the moving body 1 and the fixed body 2.

That is, the sensing unit 100 of the present invention operates in a state where the distance between the mobile body 1 and the fixed body 2 is far away when there is no human body 3 approaching between the mobile body 1 and the fixed body 2. It consists of a plurality of non-contact sensors with the same basic sensor output value.

In addition, as the distance between the moving body 1 and the fixed body 2 of the plurality of sensors becomes closer, each sensor detects the fixed body 2 made of a metal component, and the increased basic sensor output value increases with the fixed body 1. They are arranged to display the same value regardless of distance.

Figure 4 is a diagram for explaining the sensing unit 100 mounted on a sliding door.

In the present invention, the sensing unit 100 includes a plurality of devices arranged in the up and down or left and right directions so that the basic sensor output values of each sensor detected between the moving body 1 and the fixed body 2 are the same as shown in FIG. 4. It consists of a non-contact sensor.

In other words, the angle sensor of the sensing unit 100 is arranged so that there is no difference in the basic sensor output value by detecting the same size for the fixed body 2 even when the moving body 1 and the fixed body 2 are closed adjacent to each other. .

At this time, as shown in FIG. 4, when the human body 3 approaches between the moving object 1 and the fixed object 2, there is a difference in the sensor output value of each sensor depending on the distance between each sensor 110, 120 and the human body 3. occurs.

For example, in FIG. 4, the sensor output value of the first sensor 110, which is relatively closer to the human body 3, appears larger than the sensor output value of the second sensor 120.

FIGS. 5A and 5B are diagrams for explaining the sensing unit 100 mounted on a sliding or hinged door. That is, FIG. 5A is a side view for explaining a case where the sensing unit 100 is mounted on a swinging door, and FIG. 5B is a top view for explaining a case where the sensing unit 100 is mounted on a sliding or hinged door.

As shown in FIGS. 5A and 5B, when the sensing unit 100 is mounted on a hinged door such as a PTG (Power Tail Gate), the basic value of each sensor detected between the moving body (1) and the fixed body (2) It is preferable that a plurality of sensors are arranged in the left and right directions so that the sensor output values are the same.

At this time, the arrangement direction of the sensor is explained assuming that the direction of the rotation axis along which the hinged door corresponding to the moving object 1 rotates is the left and right direction, as shown in FIGS. 5A and 5B.

For example, in a casement door as shown in Figure 5a, when a plurality of sensors are mounted in the vertical direction along the inclined direction of the casement door about the rotation axis, the distance between each sensor and the fixture 2 increases according to the rotation of the casement door. Because they are different from each other, it is not easy to install so that the basic sensor output values of each sensor are the same.

Therefore, the sensing unit 100 of the present invention includes a plurality of sensors arranged in the left and right directions so that each sensor detects the fixture 2 of the same size at the time the hinged door is closed, so that there is no difference in the basic sensor output value. It is prepared with

As shown in FIGS. 5A and 5B, when the human body 3 approaches between the moving body 1 and the fixed body 2, each sensor 110, 120 and the human body 3, as in the case of the sliding door described above, There is a difference in the sensor output value of each sensor depending on the distance between them.

For example, in Figure 5b, the sensor output value of the second sensor 120, which is relatively closer to the human body 3, appears larger than the sensor output value of the first sensor 110.

In addition, the sensing unit 100 of the present invention is provided with a plurality of sensors in which the basic sensor output value of each sensor has the same value despite environmental changes such as temperature or humidity. That is, the plurality of sensors display sensor output values of the same size in response to changes in the external environment, enabling more reliable detection of the human body 3 regardless of external environmental conditions.

In addition, in the present invention, a sensor signal equalization unit 300 is added between the sensing unit 100 and the sensor board 200 to normalize the basic sensor output by correcting sensor output errors detected by each sensor of the sensing unit 100. It can be included.

That is, when an error occurs in the basic sensor output value of each sensor due to a cause such as an installation error of the sensing unit 100, the sensor signal equalization unit 300 of the present invention adjusts the gain between each sensor to adjust the basic sensor output value. It can be leveled.

For example, when a plurality of sensors are mounted on the moving object 1, the sensor signal equalization unit 300 of the present invention adjusts the slight error that occurs due to differences in physical length or installation location between each sensor to obtain a basic sensor output value. These can be corrected to show the same value.

Through this, the present invention can increase the accuracy of detecting the human body 3 by correcting errors between each sensor in advance.

FIG. 6 is a block diagram showing the sensor board 200 in FIG. 3 in detail.

In the present invention, the sensor board 200 may include a detection unit 210, a sensor signal processing unit 220, a comparison unit 230, and a storage unit 240, as shown in FIG. 6.

Additionally, in the present invention, the detection unit 210 detects the sensor output difference value between each sensor based on the detection result detected by the sensing unit 100.

For example, when the non-contact sensor included in the sensing unit 100 consists of two sensors, the first sensor 110 and the second sensor 120, as shown in FIG. 1, the detection unit 210 is connected to the first sensor 110. ) and detects the sensor output difference value between the second sensor 120.

In addition, when the non-contact sensors included in the sensing unit 100 are arranged in the order of the first sensor 110, the second sensor 120, and the third sensor 130, the detection unit 210 is connected to the first sensor 100. At least one of the sensor output difference values between (110) and the second sensor 120, between the second sensor 120 and the third sensor 130, and between the first sensor 110 and the third sensor 130. It can be detected.

If there is no approach of the human body (3) between the moving object (1) and the fixed object (2), there is no difference in the basic sensor output values between each sensor, so they cancel each other out, resulting in the sensor output difference value detected through the detection unit 210. will appear as 0.

However, when a foreign object or a human body 3 approaches between the moving body 1 and the fixed body 2, the first sensor 110, the second sensor 120, and the third sensor are connected according to the approach position or direction. Since a difference occurs in the sensor output values detected at 130, the sensor output difference between these sensors is detected through the detection unit 210.

That is, the basic sensor output values of the first sensor 110, the second sensor 120, and the third sensor 130 cancel each other out (each sensor 110, 120, Since the sensing values detected by the door frame itself (21) in 130) are the same, only the difference in sensor output values between the sensors generated by detecting foreign substances or the human body (3) by each sensor (110, 120, 130) remains. and is detected through the detection unit 210.

At this time, it is preferable that the sensing unit 100 according to an embodiment of the present invention is composed of an odd number of non-contact sensors.

If the human body 3 is in a position where the sensor output value is balanced between the moving body 1 and the fixed body 2, the sensor output difference value between each sensor through the detection unit 210 is greater than or equal to the pinch threshold level range. may not be detected.

Here, the pinch threshold level range represents a reference range set to determine whether the human body 3 is caught between the moving body 1 and the fixed body 2 using the sensor output difference value.

For example, the sensing unit 100 is provided with a first sensor 110 and a second sensor 120, and the human body 3 is positioned across the midpoint of the first sensor 110 and the second sensor 120. In this case, the sensor output values through the first sensor 110 and the second sensor 120 may appear the same.

That is, even when the human body 3 is located between the moving body 1 and the fixed body 2, the first sensor 110 and the second sensor 120 detect the human body 3 in the same way and the first sensor The difference in sensor output value between 110 and the second sensor 120 is not detected beyond the pinch threshold level range.

However, in the case where the sensing unit 100 is arranged with an odd number of non-contact sensors, the sensor output value resulting from the detection of the human body 3 is a sensor that shows a different sensor output value from the symmetrical sensors, excluding the sensors that are paired and symmetrical. There exists at least one.

In the present invention, the sensor signal processing unit 220 removes the noise signal based on the sensor output difference value detected by the detection unit 210, or converts the sensor output difference value into an absolute value magnitude to obtain a signal-processed sensor output difference value. creates .

In other words, since the sign of the detection result signal may appear differently depending on the location or direction of the foreign object or human body (3) approaching between the moving object (1) and the fixed object (2), for accurate comparison and judgment of the detection result signal The sensor signal processing unit 220 may take an absolute value of the detection result signal of the detection unit 210.

In addition, in the present invention, the comparison unit 230 compares the sensor output difference value detected by the detection unit 210 or the sensor output difference value processed as a signal by the sensor signal processing unit 220 with a preset pinch threshold level, and If the sensor output difference value is outside the set pinch threshold level range, a pinch signal is output.

That is, when the sensor output difference value between the detected sensors 110 and 120 is outside the preset pinch threshold level range, the comparator 230 determines that a foreign object or the human body 3 is caught and outputs a pinch signal.

At this time, when the comparator 230 compares and determines whether or not there is a pinch using the sensor output difference value processed by the sensor signal processing unit 220 and converted to an absolute value, the comparison is made with a preset pinch threshold level value. And, if the sensor output difference value is more than the pinch threshold level value, a pinch signal is output.

However, when the comparison unit 230 compares and determines whether there is a pinch using the sensor output difference value detected by the detection unit 210, the sign of the detection result signal may appear differently depending on the position or direction of the human body 3. there is.

Therefore, when the comparison unit 230 uses the sensor output difference value detected by the detection unit 210, the sensor output difference value is compared through a preset pinch threshold level range, and the sensor output difference value is set within the pinch threshold level range. If it deviates, a pinch signal is output.

For this reason, the comparison unit 230 can determine whether there is a pinch and output a pinch signal regardless of whether the sign of the sensor output difference value detected by the detection unit 210 is detected as a (+) signal or a (-) signal. .

Additionally, the storage unit 240 of the present invention stores the pinch threshold level value or pinch threshold level range in advance. Additionally, the storage unit 240 may store the sensor output difference value between each sensor detected through the detection unit 210.

In addition, the non-contact safety detection device 10 according to an embodiment of the present invention includes a motor 4 that is connected to the moving object 1 and rotates forward or reverse to drive the moving object 1, and the comparison unit 230. It may further include a motor control unit 400 that stops or reverse drives the motor 4 according to the output pinch signal.

The above-described content is explained using sensor output values according to the distance between the moving object 1 and the fixed object 2 as follows.

Figure 7 is a diagram for explaining the sensor output of the non-contact safety detection device 10 according to an embodiment of the present invention.

That is, Figure 7 shows the distance between the door 11 on which the sensing unit 100 is mounted and the door frame itself 21 when the sensing unit 100 is composed of the first sensor 110 and the second sensor 120. This is a diagram showing the sensor output values of each sensor (110, 120).

In addition, in FIG. 7, the basic sensor output value 71 of the first sensor 110 and the basic sensor output value 72 of the second sensor 120 are shown to be different from each other for visual distinction, but this is for the purpose of explanation. For convenience purposes only, it is assumed that they represent the same sensor output value.

As shown in the upper left corner of FIG. 7, the basic sensor outputs 71 and 72 of the first sensor 110 and the second sensor 120 are in a state where the distance between the door 11 and the door frame itself 21 is long. The first section 73 shows the same constant sensor output value.

However, as shown in the upper right corner of FIG. 7, in the second section 74 where the position of the vehicle door 11 approaches the door frame itself 21, the basic sensor output values of the first sensor 110 and the second sensor 120 (71, 72) represents an increasing curve that increases in inverse proportion to the distance between the door 11 and the door frame itself 21.

Therefore, when the pinch threshold level for determining whether the human body 3 is caught is set to a constant level and the pinch signal is output using only the sensor output detected by the sensor, the second sensor output is above the pinch threshold level. An error occurs in which a pinch signal is output in section 74 even when there is no human body 3 approaching.

However, the non-contact safety detection device 10 according to an embodiment of the present invention detects the difference value 75 between the sensor outputs detected by the first sensor 110 and the second sensor 120, and the detected sensor output Based on the difference value (75), a pinch signal is output by comparing it with the pinch threshold level.

For this reason, the non-contact safety detection device 10 of the present invention detects the door as shown in the bottom drawing of FIG. 7 in a state where there is no access of the human body 3 between the door 11 and the door frame itself 21. The sensor is constant regardless of the first section 73 where the distance between 11) and the door frame itself 21 is far away and the second section 74 where the position of the vehicle door 11 is close to the door frame itself 21. Indicates the output difference value (75).

Therefore, the present invention is a state in which there is no access of the human body 3 due to the influence of the door frame itself 21 detected by the sensor in the second section 74 where the door 11 approaches the door frame itself 21. It is also possible to prevent errors in outputting pinch signals.

Meanwhile, the lower drawing of FIG. 7 shows the pinch threshold level range for the comparison unit 230 to determine whether there is a pinch using the sensor output difference value detected by the detection unit 210.

That is, the dotted lines 76a and 76b in the lower drawing of FIG. 7 indicate the pinch threshold level upper limit 76a and the pinch threshold level lower limit 76b of the pinch threshold level range set to determine whether the human body 3 is caught.

The present invention extracts the pinch threshold level based on the basic sensor output detected from each sensor of the sensing unit 100, and sets the pinch threshold level upper limit 76a and the pinch threshold level lower limit 76b based on the extracted pinch threshold level. You can set the pinch threshold level range.

As described above, the comparator 230 of the present invention determines whether a pinch is present by comparing the sensor output difference value in which the sign of the signal appears differently depending on the approaching position or direction of the human body 3 based on the pinch threshold level range. You can.

That is, when the sensor output difference value detected by the detection unit 210 is outside the pinch threshold level range, the comparison unit 230 of the present invention determines that a foreign object or the human body 3 is caught and outputs a pinch signal.

In this way, the non-contact safety detection device 10 according to an embodiment of the present invention has the effect of preventing malfunctions by detecting the door frame itself made of metal without being provided with location information of the moving object 1. There is.

In addition, the non-contact safety detection device 10 of the present invention does not need to receive location information of the moving object 1 from the main CPU to prevent malfunction of the human body entrapment device, so the price can be reduced through simplification of the device, It has the effect of being easy to install regardless of the vehicle type or size.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be easily modified by a person skilled in the art from the embodiments of the present invention to provide equivalent equivalents. Includes all changes within the scope deemed acceptable.

1: moving body 2: fixed body
3: human body 4: motor
10: Non-contact safety detection device
100: sensing unit 110: first sensor
120: second sensor 200: sensor board
210: detection unit 220: sensor signal processing unit
230: comparison unit 240: storage unit
300: Sensor signal equalization unit 400: Motor control unit

Claims (7)

In the non-contact safety detection device that detects the approach of a human body in a non-contact manner when operating a power door using a motor,
A sensing unit provided on one side of a moving or fixed body and including a plurality of sensors having the same basic sensor output value detected in the absence of foreign substances or human bodies approaching;
a detection unit that detects a sensor output difference between each sensor based on detection results detected through the plurality of sensors; and
A non-contact safety sensing device comprising a comparison unit that compares the sensor output difference value with a preset pinch threshold level and outputs a pinch signal when the sensor output difference value is outside the preset pinch threshold level range.
In paragraph 1:
When the sensing unit is mounted on a sliding door, a plurality of sensors are arranged up and down or left and right so that the basic sensor output values detected by each sensor have the same value regardless of the distance between the sliding door corresponding to the moving object and the fixed object. Non-contact safety sensing device.
In paragraph 1:
When the sensing unit is mounted on a swing door, a plurality of sensors are arranged in the direction of the rotation axis of the swing door so that the basic sensor output values of each sensor detected between the swing door corresponding to the moving object and the fixed body have the same value. Non-contact safety sensing device.
In paragraph 2 or 3:
As the distance between the moving object and the fixed object becomes closer, the plurality of sensors detect the fixed object made of metal when each sensor mounted on the moving object detects the fixed object and increases the basic sensor output value of each sensor to that of the fixed object. A non-contact safety detection device characterized by being provided with sensors that show the same value depending on the location.
In paragraph 1:
A non-contact safety device further comprising a sensor signal equalization unit between the sensing unit and the detection unit that corrects the sensor output error between each sensor based on the detection results detected through the plurality of sensors and normalizes the basic sensor output value of each sensor to have the same value. Sensing device.
In paragraph 1:
Non-contact safety further comprising a sensor signal processing unit that removes noise signals based on the sensor output difference value detected by the detection unit or converts the sensor output difference value into an absolute value and generates a signal-processed sensor output difference value. Sensing device.
In paragraph 6:
The comparison unit compares the sensor output difference value processed by the sensor signal processing unit with a preset pinch threshold level value, and outputs a pinch signal when the signal processed sensor output difference value is greater than or equal to the pinch threshold level value. Safety detection device.