KR102214358B1 - Data input and output structure in differential signal lines having signal extracting unit - Google Patents

Abstract

The present invention relates to a data input/output structure in a differential signal line including a signal extractor, and more specifically, it is possible to retrieve or input necessary data even if an electrical connection with an existing communication line is not made, and a form surrounding the signal line The present invention relates to a data input/output structure in a differential signal line capable of increasing signal extraction performance by forming a signal extracting unit of the signal line to transmit a signal generated from the entire circumference of the signal line to an antenna.

Description

Data input and output structure in differential signal lines having signal extracting unit}

The present invention relates to a data input/output structure in a differential signal line including a signal extractor, and more specifically, it is possible to retrieve or input necessary data even if an electrical connection with an existing communication line is not made, and a form surrounding the signal line The present invention relates to a data input/output structure in a differential signal line capable of increasing signal extraction performance by forming a signal extracting unit of the signal line to transmit a signal generated from the entire circumference of the signal line to an antenna.

A digital tacho graph is installed inside a commercial vehicle or a transport vehicle, and the vehicle's speed, RPM information, brake signal detection through the vehicle's ECU and sensors, location information through GPS, acceleration, mileage, It is a device that receives and stores driving data such as shock detection, or displays numerical values through a display and warns when necessary.

In Korea, it is compulsory to install a digital tachometer on taxis, freight vehicles or buses through the enforcement regulations of the Traffic Safety Act.

These digital tachographs are usually connected to the vehicle's CAN communication (Controller Area Network) through an OBD (On Board Diagnostics) terminal to receive data from various devices.

However, in the conventional method, the digital tachograph must be physically and electrically connected to the CAN bus. That is, a digital tachograph electrically connected to the CAN bus acts as a device, and as multiple connections occur to signal lines, there is a concern that the strength of the signal is distorted or decreased on the entire line.

In addition, in order to solve the problem of the contact signal extraction, even when the signal is extracted in a non-contact manner without physical or electrical connection, there is a problem in that it is difficult to extract a normal signal because it is difficult to detect a signal in the case of a cable with a thick sheath.

On the other hand, as a conventional technology related to a tachograph for performing CAN communication with a vehicle, there is Korean Patent Publication No. 10-2013-0044624 (2013.05.03. A digital tachometer for a vehicle and a collection method thereof).

The present invention was conceived to solve the problems of the prior art as described above, it is possible to retrieve or input necessary data even if electrical connection with the existing communication line is not made, and form a signal extractor in a shape surrounding the signal line. Accordingly, an object thereof is to provide a data input/output structure in a differential signal line including a signal extracting unit capable of increasing signal extraction performance by allowing signals generated from the entire circumference of a signal line to be transmitted to an antenna.

A data input/output structure in a differential signal line including a signal extracting unit according to the present invention for achieving the above object is installed on a signal line for transmitting a differential signal, and for drawing a signal flowing through the signal line and transmitting it to an external device. A data output unit; And a data input unit installed on the signal line and configured to input a signal input from the external device to the signal line, wherein the data output unit comprises a differential signal positioned adjacent to the signal line and flowing through the signal line. An antenna for extracting a signal from the signal line by generating a current flow by magnetic interference induced according to the magnetic interference; And a signal extracting unit formed in a shape surrounding the signal line to extract a signal generated from the entire circumference of the signal line and transmit the extracted signal to the antenna.

In this case, the signal extracting unit may further include a pressing unit for bringing the signal line into close contact with the antenna.

According to the data input/output structure according to the present invention, when an external device such as a digital tachograph or a maintenance scanner is connected to the CAN communication network, the signal line and the external device are not electrically connected, but data output using an electromagnetic induction phenomenon. As it has a structure and a data input structure that converts light energy into electrical energy and inputs a signal, it is possible to prevent signal distortion or reduction that may occur due to the addition of an external device to the CAN communication network through an electrical connection method. There can be.

In addition, by forming a signal extracting unit in a shape surrounding the signal line so that the signal generated from the entire circumference of the signal line can be transmitted to the antenna, there is an effect of increasing the signal extracting performance and obtaining the vehicle information signal accurately and effectively. .

1 is a diagram for explaining a data input/output structure according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a data output unit in the data input/output structure shown in FIG. 1;
3 is a diagram for explaining a change in a signal drawn through a data output unit in the data input/output structure shown in FIG. 1;
4 is a diagram for explaining a data input unit in the data input/output structure shown in FIG. 1;
5 is a view for explaining another embodiment of a data output unit in the data input/output structure shown in FIG. 1;

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, some configurations irrelevant to the gist of the invention will be omitted or compressed, but the omitted configuration is not necessarily a configuration unnecessary in the present invention, and will be combined and used by a person having ordinary knowledge in the technical field to which the present invention belongs. I can.

1 is a diagram illustrating a data input/output structure according to an embodiment of the present invention.

As shown in FIG. 1, the data input/output structure according to the embodiment of the present invention includes a data output unit 30 and a data input unit 40.

Prior to the description, the data input/output structure according to an embodiment of the present invention can be applied only to a differential signal line. Differential signal refers to a signal that flows in phase opposite to each other on two transmission lines, and RS485 or CAN communication uses a differential signal. Hereinafter, an example in which CAN communication of a vehicle is applied as an example of a differential signal will be shown and described.

Referring back to FIG. 1, various devices 11, 12, 13, and D_N of the vehicle are connected to two signal lines 1 and 2 for CAN communication of the vehicle. The first device 11 may be, for example, an ECU (Electronic Control Unit), the second device 12 may be, for example, an Anti-lock Brake System (ABS), and the third device 13 may be, for example, TPMS (Tire Pressure Monitoring System). In this way, it is assumed that the N devices 11, 12, 13, and D_N up to the Nth device D_N are already bitten by the first signal line 1 and the second signal line 2.

In this state, the external device (D_X) is connected to the CAN communication network in order to transmit a request message to each device (11,12,13,D_N) and to retrieve the data sent from each device (11,12,13,D_N). It is necessary, but in the present embodiment, the external device D_X is connected to the signal lines 1 and 2 through the data output unit 30 and the data input unit 40. The connection expressed here does not refer to the existing electrical connection, and we will look at it in detail.

FIG. 2 is a diagram for explaining the data output unit 30 in the data input/output structure shown in FIG. 1, FIG. 2(a) is a schematic diagram of the data output unit 30, and FIG. 2(b) is It is a block diagram of the output unit 30 (the signal extracting unit 50 is omitted in the composition of the drawing).

As shown in FIG. 2, the data output unit 30 includes a substrate 31, an antenna 32, a detection and amplification circuit 33, and a signal extraction unit 50.

The substrate (PCB) 31 is formed on one side of the lower end of the housing 10, and the antenna 32 and the detection and amplification circuit 33 are mounted.

The antenna 32 refers to a copper pattern having a predetermined width (approximately 2.5 mm) and length (approximately 40 mm), and is located at a position where the first signal line 1 and the second signal line 2 pass from the substrate 31. Each antenna 32 is printed.

The detection and amplification circuit 33 is a known configuration and is provided to detect and amplify a signal sensed through the antenna 32 and transmit it to the output connector 21 side of the external device D_X.

The signal extracting unit 50 is formed on the inner upper surface of the housing 10 in the same number as the signal lines 1 and 2, and when the housing 10 is closed, the first signal line 1 and the second signal line 2 ) By pressing the upper end to make close contact with the antenna 32, and at the same time, surrounds both the upper and both sides of the first signal line 1 and the second signal line 2, and the lower end of the signal extracting unit 50 As a result of contact with the antenna 32, the entire circumference of the first signal line 1 and the second signal line 2 is surrounded by the antenna 32 and the signal extracting unit 50.

At this time, the signal extracting unit 50 may wrap the signal lines 1 and 2, such as an EMI gasket, a conductive sponge, a metal material bent to surround the signal lines 1 and 2, and a structure wrapped around a wire mesh mesh. It can be formed using a conductive material.

A process of extracting data from the signal lines 1 and 2 through the data output unit 30 will be described as follows.

3 is a diagram for explaining a change in a signal output through the data output unit 30 in the data input/output structure shown in FIG. 1. The signal shown at the top in FIG. 3 represents the original signal flowing on the signal lines 1 and 2. As shown in Fig. 3, signals flowing through the first signal line 1 and the second signal line 2 are differential signals whose phases are opposite to each other. That is, since the voltage value of the signal flowing in each signal line (1, 2) changes periodically, a magnetic field is generated around the signal lines (1, 2), and is located within the magnetic field region of the signal lines (1, 2). A current flow is finely generated in the antenna 32 according to the electromagnetic induction phenomenon.

Looking at the signal flow shown second in FIG. 3, the signal detected by each antenna 32 and input to the detection and amplification circuit 33 is in the same form as the original signal flowing along the signal lines (1, 2). It has a signal pattern of varying amplitude. However, since the detected signal is significantly attenuated compared to the original signal, it is amplified by the detection and amplification circuit 33, and the amplified signal is similar to the shape of the original signal as shown at the bottom of FIG. 3.

The signal amplified through the detection and amplification circuit 33 is transmitted to the external device D_X through the output connection 21. Here, the output connection part 21 refers to a configuration for connecting the data output part 30 and the external device (D_X) for signal transmission, and the output connection part 21 may be provided in the data output part 30 depending on implementation. In addition, it may be provided in the external device D_X. In addition, the data output unit 30 and the external device (D_X) may be provided with output connection units 21, respectively, and may be connected to each other.

Of course, even though the data output unit 30 and the external device (D_X) are physically and electrically connected to each other through the output connection unit 21, the signal lines 1 and 2 and the antenna 32 are electrically connected. Since no, the external device (D_X) has no effect on the CAN communication network.

As described above, in the process of extracting data from the signal lines 1 and 2 through the data output unit 30, the signal extracting unit 50 presses the signal lines 1 and 2 and makes it in close contact with the antenna 32. At the same time, since the signal extracting unit 50 is formed in a shape surrounding the signal lines 1 and 2, it is possible to accurately and effectively acquire a vehicle information signal by increasing signal extraction performance.

Specifically, in the prior art, the upper end of the signal lines 1 and 2 in contact with the antenna 32 in order to extract vehicle information signals from the signal lines 1 and 2 in a non-contact manner. Although a method of pressing in close contact with a pressing member such as a sponge was used, in this case, extraction of the vehicle information signal around the lower ends of the signal lines 1 and 2 in direct contact with the antenna 32 may be performed normally. Vehicle information signals at the top and side circumferences of the signal lines 1 and 2 that do not directly contact the antenna 32 are difficult to extract or the extraction performance is significantly degraded, so the induction signal is weak, such as a thick-covered cable. There was a problem in that the signal extraction performance was significantly deteriorated.

On the other hand, in the present invention, in the process of extracting data from the signal lines 1 and 2 through the data output unit 30, the signal extracting unit 50 presses the signal lines 1 and 2 to closely contact the antenna 32. Therefore, the signal flowing through the signal lines 1 and 2 can be more accurately and effectively extracted to the antenna 32, and at the same time, the signal extracting unit 50 is formed to surround the signal lines 1 and 2 By allowing the signal generated from the entire circumference of the lines 1 and 2 to be transmitted to the antenna 32, signal extraction performance can be increased, thereby accurately and effectively obtaining a vehicle information signal.

4 is a diagram for explaining the data input unit 40 in the data input/output structure shown in Fig. 1, Fig. 4(a) is a block diagram of the data input unit 40, and Fig. 4(b) is a signal input It shows the shape of the signal input to the signal lines 1 and 2 depending on whether or not.

As shown in FIG. 4, the data input unit 40 includes an optical driver 41 and a photo coupler 42.

The optical driver 41 is provided to control the light emitting portion 43 of the photocoupler 42 in response to a signal input through the input connection portion 22 of the external device D_X.

The photocoupler 42 includes a light-emitting unit 43 and a light-receiving unit 44 with a configuration for transmitting a signal using light in an electrically insulated state.

The light-emitting unit 43 is a light-emitting diode that outputs an optical signal under the control of the optical driver 41, and the light-receiving unit 44 is configured to convert an optical signal generated from the light-emitting unit 43 into electrical energy. It can be applied to the light receiving unit 44.

A process of inputting data from the external device D_X to the signal lines 1 and 2 through the data input unit 40 will be described as follows.

First, in the external device (D_X), a request message including the ID of the device can be input in order to obtain data of a specific device among devices (11, 12, 13, D_N) connected to the signal lines (1, 2). have. A signal input from the external device D_X is transmitted to the optical driver 41 through the input connector 22, and the optical driver 41 controls the light emitting unit 43 to generate light corresponding to the input signal.

When an optical signal corresponding to the input signal of the external device D_X is generated from the light emitting unit 43, the light receiving unit 44 generates electric energy corresponding to the optical signal so that it is input to the signal lines 1 and 2, respectively.

Referring to FIG. 4B, when there is no signal (the light emitting unit 43 does not generate light, and thus the light receiving unit 44 is in an off state), a high value flows through the signal lines 1 and 2. On the other hand, when light is generated from the light emitting unit 43 and the light receiving unit 44 is turned on and the signal lines 1 and 2 are connected to each other, a low value flows through the signal lines 1 and 2. That is, high or low is repeated in the signal lines 1 and 2 depending on whether or not the light emitting unit 43 generates light, and this signal becomes an input signal and is carried on the signal lines 1 and 2.

Therefore, a response signal can be generated by the devices 11, 12, 13, D_N corresponding to the corresponding input signal (request message), and the response signal is loaded on the signal lines 1 and 2 again, and the data output unit ( It is transmitted to the external device D_X through the output connection part 21 through 30).

Here, the photocoupler 42 of the data input unit 40 is implemented near the terminating resistor 3 connected to the signal lines 1 and 2.

As described above, the data input unit 40 can input the input signal of the external device D_X onto the signal lines 1 and 2 through the photocoupler 42, at this time, the light receiving unit 44 of the photocoupler 42 ), the collector end and the emitter end are respectively connected to the signal lines 1 and 2, but the light-receiving part 44 and the light-emitting part 43 are not electrically connected to each other, but are converted into electrical energy through light energy. Because of its configuration, it can be viewed as being substantially insulated. Therefore, even in the data input unit 40, the external device D_X is not electrically connected to the CAN communication network and does not have any effect.

Meanwhile, the input connector 22 refers to a configuration that connects the external device D_X and the data input unit 40 for signal input. Depending on implementation, the input connector 22 may be provided in the data input unit 40, It may be provided in the external device D_X. In addition, the data input unit 40 and the external device D_X may be provided with input connection units 22, respectively, and may be connected to each other.

In addition, in the present embodiment, an example in which the optical driver 41 controlling the light emitting unit 43 of the photocoupler 42 is included in the data input unit 40 is illustrated and described, but according to the implementation, the optical driver 41 It may be a configuration included in the external device D_X together with the input connector 22.

Meanwhile, FIG. 5 is a view for explaining another embodiment of a data output unit in the data input/output structure shown in FIG. 1.

As shown in FIG. 5, in the data output unit 30 according to another embodiment of the present invention, the antenna 32 is formed to protrude in a vertical shape with the substrate (PCB) 31, and the signal extracting unit 50 Is formed in a'b' shape so as to surround the signal lines 1 and 2 respectively located on the outer surface of the antenna 32 and contact the antenna 32 at the same time.

In addition, the signal extracting unit 50 is provided with a plurality of pressing units 51 in the form of a plurality of elastic pieces that press the signal lines 1 and 2 in close contact with the antenna 32.

In the process of extracting data from the signal lines 1 and 2 through the data output unit 30 by the above structure, the pressing unit 51 of the signal extracting unit 50 presses the signal lines 1 and 2 Therefore, since the signal flowing through the signal lines (1, 2) can be more accurately and effectively extracted to the antenna (32), the signal extracting unit (50) connects the signal lines (1, 2) to the antenna (32). It is formed in an enclosing shape so that a signal generated from the entire circumference of the signal lines 1 and 2 can be transmitted to the antenna 32, thereby increasing signal extraction performance, thereby accurately and effectively obtaining a vehicle information signal.

At this time, the signal extracting unit 50 including the pressing unit 51 according to another embodiment of the present invention is preferably formed of a metal material, but is not limited thereto, and can press the signal lines 1 and 2 It is possible to be formed in a variety of materials with sufficient rigidity and conductivity.

As described in detail above, according to the data input/output structure according to the present invention, when an external device such as a digital tachograph or a maintenance scanner is connected to the CAN communication network, the signal line and the external device are not electrically connected, It has a data output structure using electromagnetic induction and a data input structure that converts light energy into electrical energy and inputs a signal, preventing signal distortion or reduction that may occur when an external device is added to the CAN communication network. I can do it.

In addition, by forming a signal extracting unit in a shape surrounding the signal line so that the signal generated from the entire circumference of the signal line can be transmitted to the antenna, there is an effect of increasing the signal extracting performance and obtaining the vehicle information signal accurately and effectively. .

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes and additions within the spirit and scope of the present invention. And additions will be seen as falling within the scope of the claims of the present invention.

1: first signal line
2: second signal line
3: terminating resistance
10: case
11: first device
12: second device
13: 3rd device
D_N: N device
D_X: External device
21: output connection
22: input connection
30: data output section
31: substrate
32: antenna
33: detection and amplification circuit
40: data input unit
41: optical driver
42: photo coupler
43: light emitting part
44: light receiving unit
50: signal extraction unit
51: pressing part

Claims (2)

A data output unit installed on a signal line for transmitting a differential signal, for drawing a signal flowing through the signal line and transmitting it to an external device; And
A data input unit installed on the signal line to input a signal input from the external device to the signal line;
The data output unit,
An antenna located adjacent to the signal line and generating a current flow by magnetic interference induced by a differential signal flowing through the signal line to extract a signal from the signal line; And
A signal extracting unit formed in a shape surrounding the signal line and in close contact with the antenna to extract a signal generated from the entire circumference of the signal line and transmit it to the antenna
A differential signal line including a signal extracting unit, characterized in that the upper, lower, and both sides of the signal line are surrounded by the signal extracting unit and the antenna so that a signal generated from the entire circumference of the signal line can be extracted from the antenna. Data input/output structure
The method of claim 1,
The signal extraction unit,
A data input/output structure in a differential signal line including a signal extracting unit, further comprising: a pressing unit for closely contacting the signal line to the antenna.

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