KR101682305B1 - Wearable smart-key system for vehicle - Google Patents

Wearable smart-key system for vehicle Download PDF

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KR101682305B1
KR101682305B1 KR1020150097462A KR20150097462A KR101682305B1 KR 101682305 B1 KR101682305 B1 KR 101682305B1 KR 1020150097462 A KR1020150097462 A KR 1020150097462A KR 20150097462 A KR20150097462 A KR 20150097462A KR 101682305 B1 KR101682305 B1 KR 101682305B1
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South Korea
Prior art keywords
wearable smart
vehicle
smart key
rssi
channel
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KR1020150097462A
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Korean (ko)
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곽계현
양권
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덴소코리아일렉트로닉스 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds

Abstract

The present invention relates to a wearable smart-key system for a vehicle, to realize, in a vehicle, a communication algorithm with a real time location service (RTLS) to load a received signal strength indicator (RSSI) map on a low frequency (LF) wave and transmit the LF wave, and comparing and determining radio frequency (RF) data which is a response signal of a wearable smart-key in response to the same, so as to enable a user to remotely control each driving part of the vehicle. According to the present invention, the system comprises: a wearable smart-key having a wearable type capable of being worn by a user, and transmitting each control signal in order to control each driving unit of a vehicle in response to a user action when the user approaches the vehicle; and a short distance wireless communication device loading each RSSI map on an LF wave to transmit the LF wave through a plurality of diversity antennas, and having an RTLS to assign an RSSI value to each RF data responded from the wearable smart-key, and compare and determine the RSSI values, so as to track a location of the wearable smart-key in real time. The RTLS of the short distance wireless communication device measures a distance between each diversity antenna becoming a reference point on a two-dimensional plane and the wearable smart-key, which is a moving node, through a triangulation using the RSSI map, so as to estimate a real time location of the wearable smart-key.

Description

[0001] WEARABLE SMART-KEY SYSTEM FOR VEHICLE [0002]

The present invention relates to a smart key system for a vehicle, and more particularly, to a smart key system for a vehicle, and more particularly to a smart key system for a vehicle, which is capable of remotely controlling each driver of a vehicle by comparing and comparing RF data of a wearable smart key, Key system.

In order for a car to move, it must first be activated. That is, it is the starter that plays the role of assisting with the external physical force until the car engine can operate by itself.

The vehicle's starting system starts with the world's first gasoline car made in Germany by Karl Benz in 1886. If you turn the large flywheel, which is placed horizontally in the back of the vehicle, clockwise, the metal strips that are connected to the flywheel collide with each other, I got up and started. By 1915, the crank handle was inserted into a small hole beneath the radiator grill and was directly connected to the crankshaft.

This method was very powerful and very dangerous, but since the engine revolutions must exceed 100 revolutions per minute for a sufficient supply of mixer in the carburettor of the engine, a strong man was able to start only when he had to turn the crank handle with his force. Therefore, frequent accidents involving a large injury to the hands or arms occurred during the start-up. Byron Carter, a close friend of Cadillac Sarrand's president, was driving and cranking up the handle, causing his head to be hurt. After the accident, Mr. Leland gave instructions to the company, Delco President of Charles Kettering invented the self-starter, which is an electric automatic starter that starts when the button is pressed. This is a way of connecting the battery's direct current motor to the crankshaft flywheel gear and starting it.

The 1911 Kettering-developed push-button automatic starter was first fitted to the Cadillac Model 30 in 1912, and by 1914 90 percent of US model cars were equipped with a self-starter. This self-starter is a breakthrough invention that increases the car population and meets the revolutionary turning point in the history of automobiles, where seniors and women can easily drive. In 1949, Chrysler of the United States developed a turn-key starter that started by connecting the electrical system of the starter to the car key lock switch. And the same key can be used to select the intermediate stage to connect the battery only without operating the engine and to use the accessories such as the interior lamp or the radio.

In recent years, with the development of wireless communication technology, there has been developed a smart key system of a vehicle having the above-described turn-key starter-type vehicle theft prevention and middle stage selection,

That is, the smart key system senses a signal of a key possessed by a driver aboard the vehicle and causes the driver to operate the engine by pressing the start button. Accordingly, since the smart key possessed by the driver and the button start device of the vehicle communicate with each other wirelessly, the prevention of theft of the vehicle and the convenience of the driver are greatly improved.

The smart key system of such a vehicle opens and closes the door of the vehicle from the outside without pushing a separate key insertion or operation button by the driver, and further detects whether the smart key is indoors. The start can be made only by the operation such as pressing the start button.

The smart key system of the vehicle is a real-time location system (RTLS) application, and is mainly used in the vicinity such as an indoor space or a limited space. Such location tracking systems can be used not only in automobiles but also in a variety of industrial facilities such as parking lots, healthcare centers, production lines and warehouses, as well as security applications such as location-based access control.

The location estimation method in the RTLS system is based on the triangulation method of estimating the position of the object using the triangulation method as in the GPS and the LBS (Location-Based Service), the scene analysis using the image of the object, There is a proximity known as a Presence function.

Among them, triangulation is the most common location estimation method, and triangulation is based on Received Signal Strength Indication (RSSI) or Time of Arrival (ToA).

GPS and RFID (Radio Frequency Identification) technologies have been studied to date. One of the most widely used services is GPS satellite service, and car navigation systems are widely used. However, this is a system developed for the outdoor environment, and it can only be provided where GPS satellite signals can be received. On the other hand, the indoor location tracking technology is limited to the conventional GPS, Cell-ID based outdoor positioning , The application field has been limited to automobiles or low accuracy near information / people search. Therefore, industrial and economic utilization is very high in the future.

In recent years, Beacon has been attracting attention as a short-range wireless communication device for smartphones using Bluetooth low energy (BLE) technology. In December 2013, Beacon was first introduced by Apple as a beacon technology for mobile devices that combines BLE and Beacon. The beacon has long been a kind of optical transmission device, It has been used in automobiles.

This beacon technology provides various information and services using local location recognition and wireless communication technology. Depending on how the signal is transmitted, it is divided into sound-based low-frequency beacons, LED beacons, Wi-Fi beacons, and Bluetooth beacons. In general, BLE technology using Bluetooth 4.0 such as i-beacon is commonly used.

Referring to FIG. 1, an operation function of an automobile electronic key disclosed in Korean Patent Application Publication No. 2005-0026192 (Mar. 15, 2005), which is disclosed in an electronic key of a wristwatch type automobile, When the driver approaches the automobile and turns on the operation handle 202 'and the touch sensor, the antenna of the door handle senses the electronic key 100' to open the door, and when the driver with the electronic key 100 ' And the four indoor antennas 200 'detect the electronic key 100' so as to be able to start.

The system configuration of the automobile electronic key 100 'includes a BCM (Body Control Module) 10', a DDM (Driver Door Module) 12, and an ADM 14 ' Each of the control modules is connected to an IMMO UNIT 16 'and a PIC UNIT 18' by a CAN (Controller Area Network). The IMMO unit 16 'is connected to an ECU 22' to control the starting of the vehicle. The PIC unit 18 'includes a mechanical steering lock (MSL) 23', an operation handle 24 ' 'And the antenna 26' to control the operation of the driving handle, the door driving handle, and various antennas. In the figure, reference numeral 20 'is a receiver for receiving a signal. Typical types of such electronic keys are a smart card type electronic key and an FOB type (pocket type) electronic key.

However, these electronic keys mainly focus on door opening and closing operations in the inside and outside of the vehicle, and they can be carried. However, since there is no transmitting / receiving function of attaching or wearing data to the body of the driver, There is still a problem that can not be ruled out.

Also, the above patent discloses only a general description of a wristwatch-type automobile electronic key, but does not disclose a specific communication algorithm.

In order to solve the above problems, it is an object of the present invention to provide a real-time location tracking service (RTLS) that transmits an RSSI MAP to an LF radio wave in a vehicle and compares RF DATA, which is a reply signal of a wearable smart key, The present invention also provides a wearable smart key system for a vehicle which can remotely control each drive unit of a vehicle by implementing a communication algorithm having a plurality of drivers.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to achieve the above object, a wearable smart key system of a vehicle according to the present invention is a wearable type that can be worn by a user, and when it is close to a vehicle, it can control each driving part of the vehicle according to the action of the user A wearable smart key for transmitting respective control signals, and a received signal strength indicator (MAP) MAP for each LF (Low Frequency) propagation through a plurality of diversity antennas, And a local wireless communication device having a Real-Time Location Service (RTLS) for real-time estimation of the location of the wearable smart key by giving an RSSI value to each RF DATA to be returned, The short-range location tracking service of the communicator includes a plurality of antennas, each of which is a reference point, Characterized in that with a distance value between the antenna and the mobile node, wherein the wearable smart key determined by triangulation (Triangulation) method using the RSSI MAP for estimating the real time position of said wearable smart key.

Also, the triangulation method using the RSSI MAP includes three reference points for each of the three diversity antennas for real-time position estimation of the wearable smart on a two-dimensional plane, and the coordinates [(x1, y1 (x2, y2, z2), (x3, y3, z3)] are placed as RSSI MAPs on LF radio waves originating from each of the diversity antennas, and coordinates of each of the three reference points and the wearable smart The distances d 1 , d 2 and d 3 between the coordinates (x, y, z) of the mobile node of the key are obtained by the following relational expression.

Figure 112015066360696-pat00001

Figure 112015066360696-pat00002

Figure 112015066360696-pat00003

In addition, an ECM (Electronic Control Modules) for controlling the wearable smart key, which is mediated from the local area wireless communication device, in the RAM, and controlling the driving parts of the channel # 1 and the channel #n, Further comprising:

The short range wireless communication device periodically transmits each RSSI MAP together with a unique ID to transmit the wearable smart key in real time in order to track the accurate position of the wearable smart key through a plurality of diversity antennas, Each of the RF data returned from the smart key is periodically received and an RSSI value is given thereto.

The short-range wireless communication device may further include a plurality of diversity antennas, each of the diversity antennas being connected to the adjacent wearable smart key to avoid collision between the adjacent diversity antennas, and to transmit the Bust sequence sequentially in order to prevent signals from overlapping with time at the same signal carrier frequency. And adopts a time division multiple access (TDMA) scheme.

The RSSI MAP of each diversity antenna of the short range wireless communication device is ANT1 (x1, y1, z1), ANT2 (x2, y2, z2) and ANT3 DATA are each ANT1 (xx1, yy1, zz1), ANT2 (xx2, yy2, zz2) and ANT3 (xx3, yy3, zz3) corresponding to the RSSI MAPs of the diversity antennas of the near- do.

Also, the wearable smart key is switched to a vehicle control mode when it is close to a radio wave area transmitted from a diversity antenna of the short-range wireless communication device, and is switched to a normal mode when it is deviated from the radio wave area.

Further, the wearable smart key is a wristwatch worn on the wrist of the user, and the general mode performs a function inherent to a clock, and the vehicle control mode is a mode in which each of the drivers of the vehicle And a control unit for controlling the control unit.

In addition, the wearable smart key may include a transmit antenna and a receive antenna for transmitting and receiving with the near field wireless communication device, and a control signal for controlling the channel # 1 driver and the channel #n driver, And a channel # 1 control signal transmitting unit to a channel #n control signal transmitting unit for transmitting the channel # 1 control signal to the short range wireless communication device through the transmission antenna.

In addition, a control signal for opening and closing the seat door of the vehicle is transmitted to the channel # 1 control signal transmitting unit, and a control signal for opening and closing the trunk door of the vehicle is transmitted to the channel # 2 control signal transmitting unit, A control signal for opening the bonnet of the vehicle is transmitted to the control signal transmitting unit # 3, and a control signal for turning on and off the starting of the vehicle is transmitted to the channel # 4 control signal transmitting unit.

In addition, the wearable smart key may include a GPS receiving antenna and a smart phone (not shown) so that the vehicle management service can be provided in connection with a private network of a public network or an automobile maintenance company through a vehicle management application. Button is provided.

The wearable smart key system of the vehicle according to the present invention transmits ID and RSSI values to the LF radio waves from each of the diversity antennas of the near field wireless communication device installed in the vehicle, And a real-time locating service (RTLS) for accurately estimating the location of the wearable smart key.

Therefore, it is possible to control each driving part of the vehicle by detecting the accurate position of the target value to be controlled in the room and near by the real time position tracking between the vehicle and the wearable smart key.

1 and 2 are diagrams showing a wearable smart key system of a vehicle according to the prior art,
FIG. 3 is a block diagram showing an embodiment of a wearable smart key system of a vehicle according to the present invention,
FIG. 4 is a perspective view showing a state in which a wearable smart key is worn in the embodiment of FIG. 3,
Figure 5 is a plan view of the embodiment of Figure 4,
Figure 6 is a block diagram of the embodiment of Figure 5,
Fig. 7 is a perspective view showing a state in which the embodiment of Fig. 3 is implemented in a vehicle,
FIG. 8 is a diagram for explaining an algorithm having a real-time location tracking service of the embodiment of FIG. 3,
FIG. 9 is a view for explaining a time division multiple access scheme in which Bust columns between diversity antennas are sequentially transmitted in the embodiment of FIG. 8,
10 is a diagram for explaining a triangulation method using the RSSI MAP of the embodiment of FIG.

Hereinafter, preferred embodiments of a wearable smart key system for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

3 to 9, the wearable smart key system of the vehicle according to the present invention includes a wearable smart key 100, a short range wireless communication device 200, an ECM 300, a display unit 400, (500a) to a channel #n driver 500n.

First, the wearable smart key 100 is a wearable type wearable by a user as shown in FIGS. 3 to 6. When the wearable smart key 100 approaches the vehicle 1, 500a to 500n, respectively. The wearable smart key 100 may be a wristwatch worn by the user as shown in FIGS. 4 to 6, and may be of any other type or type. For example, it may be a bracelet, a glove, a ring, a bracelet, a waistband, a necklace, an earring, and a pair of glasses that are not shown in the drawings but may be worn by a user. However, for convenience of explanation, a wristwatch, which is a wearable type accessory widely worn regardless of the sex of a woman or a woman, is typically substituted into the wearable smart key 100 according to the present invention.

The wearable smart key 100 is switched to the vehicle control mode when it is close to the vehicle 1, that is, when it approaches the radio wave area transmitted from the diversity antenna 210 to 230 of the short range wireless communication device 200, When it is deviated from the propagation zone, it is switched to the normal mode. The general mode means performing each unique function according to the type of the wearable smart key 100 and the vehicle control mode has a function of controlling each of the drivers 500a to 500n of the vehicle 1 . For example, the wearable smart key 100 is a wristwatch worn on the wearer's wrist, and the general mode performs a function of displaying a date, a current time, etc., which is a unique function of the watch, And controls each of the drivers 500a to 500n of the vehicle according to an action.

5 and 6, the wearable smart key 100 in the form of a wristwatch has a function inherent to a clock in the normal mode and is connected to a short range wireless communication device 200, (For example, from a clock screen to a control mode screen) when the radio wave approaches a radio wave area transmitted from a diversity antenna (210 to 230) of a vehicle, It is possible to control the driving units 500a to 500n of various vehicles 1 such as preheating starting.

Here, the action of the driver is an action of touching a corresponding drive button for vehicle control generated on the screen switched from the wearable smart key 100 to the vehicle control mode, an action of generating a motion control signal through the user's motion, And an act of generating a voice control signal through voice.

The wearable smart key 100 includes a channel # 1 control signal transmitting unit 101 to a channel # 4 control signal transmitting unit 104 for controlling the driving units 500a to 500b of the vehicle 1, A reception antenna 105 for receiving a transmission radio wave of the short range wireless communication device 200 installed in the vehicle 1 and a reception antenna 105 for receiving the channel # 1 control signal transmission unit 101 to the channel # 4 control signal transmission unit 104 A battery 107 for supplying power to the wearable smart key 100; a control unit 110 for controlling the time of the wearable smart key 100; And a time adjustment button 108 for setting the time. The mobile terminal 100 may further include a smartphone button 110 for controlling the power of the GPS receiving antenna 109 and the wearable smart key 100 and performing a smartphone function.

The control signal for transmitting the channel # 1 control signal is transmitted to the channel # 1 control signal transmitting unit 101 and the channel # 2 control signal transmitting unit 102 is connected to the trunk door of the vehicle 1 A control signal for opening and closing the bonnet of the vehicle 1 is transmitted to the channel # 3 control signal transmitting unit 103 and the channel # 4 control signal transmitting unit 104 transmits the control signal for opening / A control signal for turning on and off the starting of the vehicle 1 can be transmitted. The wearable smart key 100 may further include another channel #n control signal transmitter so as to control the other driver 500n of the vehicle 1 although not shown in the drawing.

In addition, the wearable smart key 100 according to the embodiment of the present invention is connected to a private network of a public network or an automobile maintenance company through installation of a vehicle management application, And may further include a GPS reception antenna 109 and a smartphone button 110 in order to receive management service and geographical information.

The various control signal transmitting units and the transmitting and receiving antennas and the S / W of the wearable smart key 100 described above are connected to the short range wireless communication device 200 installed in the vehicle 1 described later, the engine of the vehicle 1, Which is an actuator for driving and controlling the various driving parts 500a to 500n of the vehicle through CAN (Controller Area Network) communication with ECM (Electronic Control Modules) 200, which is an electronic control device for controlling the state of the vehicle, 1 driving unit 500a to the channel #n driving unit 500n from a remote place.

Therefore, the wearable smart key 100 according to the embodiment of the present invention is different from a general smart key that performs only a simple function such as door opening / closing and start control used in the existing vehicle 1, 1) can be easily controlled in a short distance from the various driving parts (500a, 500n), and a unique feature that does not have a fear of loss while simultaneously having a smartphone function and a GPS function while satisfying a function unique to a watch in the case of a wristwatch .

3 and 7 to 9, the near field communication device 200 according to an embodiment of the present invention detects vehicle control data through position tracking between the vehicle 1 and the wearable smart key 100 (Received Signal Strength Indicator) MAP is transmitted to the LF (Low Frequency) radio wave of the radio frequency through the diversity antennas 210 to 230 as a means for communicating with the wearable smart key 100, And a Real-Time Location Service (RTLS) for real-time tracking of the location of the wearable smart key 100 by giving an RSSI value to the DATA.

Here, the real-time location service uses radio waves of 2.45 GHz band and meets the 802.11b / g standard, similar to the location-based service (LBS) of the mobile communication network. The methods used for location tracking include Triangulation Method for estimating the position of an object using triangulation method as in GPS and Location-Based Service (LBS), Scene Analysis using Image of Object Method, and Proximity Method, which is known as Adjacent Function. Among them, triangulation is the most common location estimation method and triangulation is based on Received Signal Strength Indication (RSSI) or Time of Arrival (ToA) technique.

In addition, the communication medium uses a wireless LAN (Wi-Fi, IEEE 802.11b / g), that is, a short-range wireless communication network. This short-range wireless communication network has a bandwidth of 13.56 MHz and is a means for wireless communication with a very short distance. It includes LF, XBee, ZigBee, BlueTooth, Beacon and the like. Currently, data communication speed is 424 Kbit per second , Transportation, tickets, payment, and so on. In addition, the LF (Low Frequency) frequency is 30 to 300 kHz and the wavelength is 10 to 1 km, which is also called a km wave or a long wave. There is a feature that it can communicate far by simple device.

In the case of performing indoor / outdoor continuous positioning, the positioning technique includes a Cell-ID method, a ToA method, a Time Difference of Arrival (TDoA) method, and a Time Difference of Arrival (TDoA) method considering a processing method of a signal received from a wireless communication infrastructure, ) Method, Angle of Arrival (AoA) method, fingerprint method, and the like. GPS and RFID (Radio Frequency Identification) technologies have been studied to date. One of the most widely used services is GPS satellite service and car navigation system is widely used.

However, this is a system developed for the outdoor environment, and it can be serviced only where GPS satellite signals can be received. Indoor location tracking technology is limited due to limitations of existing GPS and Cell-ID based outdoor location tracking technology. Considering that the application field has been limited to a vehicle or a low-accuracy near information / person search, the RTLS system can be considered to be highly industrially and economically utilized by expanding the application field.

The RSSI (Received Signal Strength Indicator) MAP of the short range wireless communication device 200 according to the embodiment of the present invention is configured to include ANT1 (x1, y1, z1), ANT2 (x2, y2, z2) And the ANT1 (xx1, yy1, zz1), ANT2 (xx2, yy2) of the wearable smart key 100, which is the RSSI granted value for returning to the RSSI MAP of the short- , zz2) and ANT3 (xx3, yy3, zz3).

In addition, according to an embodiment of the present invention, the received signal strength indicator (RSSI) MAP periodically transmits an ID and an RSSI value to track the accurate position of the wearable smart key 100.

In addition, according to an embodiment of the present invention, the near field wireless communication device 200 has a beacon transmitter that periodically transmits ID and RSSI values, and the smartphone button 110 of the wearable smart key 100 When the beacon transmitter and the beacon transmitter are connected to each other, a beacon service may be performed to enable a vehicle management service.

When the wearable smart key 100 enters a signal reachable distance of the short range wireless communication device 200 installed in the vehicle 1, the beacon service transmits information provided by the beacon transmitter of the short range wireless communication device 200 to a wearable smart The smartphone button 110 of the key 100 is turned on and recognized by the generation of the smartphone function and is transmitted to the public network of the cloud server or the private network of the car maintenance company, And sends the wearable smart key 100 to the wearer by sending an information request. Therefore, the acceptable signal range is one of the important selection factors for beacon technology utilization. Especially, BLE technology, which is one of the most popular beacon technologies, has the widest allowable signal range. It is also made with low power, low battery consumption and it is possible to exchange contents with many people within range.

Hereinafter, a triangulation using the RSSI MAP algorithm using an RSSI MAP, which is a Real-Time Locating Service (RTLS) of the present invention, will be described in detail.

Referring to FIGS. 8 and 10, the triangulation method using the RSSI MAP utilizes the signal intensity according to the distance mathematically, and the RSSI is applied as the signal becomes weaker as the distance increases. In this case, the received signal strength (RSSI) in the wireless environment is expressed in units of dBm. The distance between the reference point and the mobile node is defined as a distance from the reference point to the mobile node It means to measure the value.

Accordingly, the triangulation method using the RSSI MAP is a method of estimating the real-time position of the wearable smart key 100 moving on the two-dimensional plane in order to estimate the position of the wearable smart key 100. At this time, since at least three reference points are required for real-time position estimation of the wearable smart key 100 on the two-dimensional plane, the three reference points are set to the coordinates [(x1, y1, z1) ), (x2, y2, z2), (x3, y3, z3)]. The distances d1, d2 and d3 between the coordinates of the three points of each of the diversity antennas 210 to 230 and the wearable smart key 100 can be obtained by the following relational expression.

Figure 112015066360696-pat00004

Figure 112015066360696-pat00005

Figure 112015066360696-pat00006

Also, the present invention can measure the distance using the received signal strength (RSSI) MAP, arrival time (ToA), and arrival time difference (TDoA) from the above equations (1) to (3). In other words, in FIG. 10, the blue nodes are reference points of the diversity antennas 210 to 230, and the actual distance d value between the blue nodes around the mobile node of the wearable smart key 100, which is a red node, Can be obtained. Here, the blue nodes indicate at least one functional unit connected to a path for transmitting data in a data communication network, that is, a connection point at which a wearable smart key 100 or a branch point of a communication network approaches a vehicle.

The actual distance d value between the wearable smart key 100 as a mobile node and each reference point can be found from the formula (4) and (5) below from the formula of Friis (attenuation prediction of radio waves).

Figure 112015066360696-pat00007

Figure 112015066360696-pat00008

Where L is the loss (dB) of the signal transmitted from each diversity antenna, λ is the wavelength, c is the propagation velocity of the radio signal in air of 3 × 10 8 [m / sec], f: frequency, and d: actual distance value, respectively.

Therefore, in the present invention, the d value can be obtained from the equation (5), and the reference value for the d value is preset in the memory ROM 310 incorporated in the short range wireless communication device 200 as shown in FIG. 3 (Not shown) of the short range wireless communication device 200, and makes a data communication with the wearable smart key 100 by comparison and determination.

In other words, when the wearable smart key 100 approaches the vehicle 1, the RSSI MAPs transmitted from the diversity antennas 210 and 230 of the short range wireless communication device 200 and the RF The distance d from the reference points of the diversity antennas 210 to 230 is computed by the control unit of the short range wireless communicator 200 and then the near reference value stored in the memory ROM 310 When the wearable smart key 100 is determined to have been accessed within a predetermined distance of the vehicle 1, the wearable smart key 100 is communicated with the short range wireless communication device 200 through the wearable smart key 100 100) is converted into the vehicle control mode.

Through this communication algorithm, the driver can control the various driving parts 500a to 500n of the vehicle 1 such as door opening / closing control of the vehicle 1 through the wearable smart key 100 at a close range.

In addition, the communication algorithm according to the embodiment of the present invention may be applied to a wearable smart key 100 adjacent to one local area wireless communication device 200 to avoid collision between diversity antennas 210 to 240 as shown in FIG. A time division multiple access (TDMA) scheme may be adopted in which a user carrying the mobile communication terminal transmits a Bust sequence in order to prevent signals from overlapping with time at the same signal carrier frequency.

Accordingly, the implementation of the communication algorithm having the real-time location tracking service according to the embodiment of the present invention can be applied to a gyro sensor, an acceleration sensor for detecting impact and tilt values, a blood pressure / pulse measurement sensor, a motion sensor for detecting movement, Control various driving parts 500a to 500n of the vehicle by convergence with various physical mechanisms such as a displacement sensor having a moving object, a proximity sensor with movement of an object, a gravity sensor using inertia of an object, a fingerprint and voice recognition sensor, You can have unique features that you can do.

An ECM (Electronic Control Modules) 300 is an engine control unit (ECU) that measures the ignition timing value and the fuel injection value, which are the initial settings of the engine revolution speed, the intake air amount, the intake pressure, And corrects the water temperature sensor, oxygen sensor, etc., and adjusts the opening and closing rate of the injector, which is the fuel injecting device. In addition, a limit value is set in advance to prevent overload of each part of the engine, and the CAN is communicated to each of the drivers 500a to 500n by a computer that controls the respective drivers 500a to 500n.

3 and 7, the ECM 300 stores the control signal of the wearable smart key 100 mediated from the local area wireless communication device 200 in the RAM 320, And controls the channel # 1 driving unit 500a to the channel #n driving unit 500n, which are driving units of the vehicle 1. [

Referring to FIG. 3, the ROM (Read Only Memory) 310 of the ECM 300 is a memory IC means incorporated in the ECM 300, It is a device that stores basic data. It is a device that basic control and command necessary for driving (1) driving and safety is kept, even if power is cut off, by backup battery permanently.

Referring to FIG. 3, the RAM (Random Access Memory) 320 is a memory IC unit built in the ECM 300 and transmits various signals to the ECM 300 while the vehicle 1 is operating. And temporarily stores various signals transmitted to the ECM 300. Temporarily stored signals gradually disappear over time. In addition, if electricity is not supplied, all data temporarily stored will be lost.

3 and 7, the display unit 400 according to the embodiment of the present invention is a car navigation system that displays various information on the vehicle 1 as well as a media operation function and displays geographic information, It is a road and traffic information providing system that provides the user with the shortest or optimal route to the destination to arrive in the future. It combines GPS technology and mobile communication technology to collect and analyze traffic information of various alternative routes in real time in order to provide the optimal route from the user to the destination, thereby reducing traffic congestion and providing safe and comfortable driving environment .

In the embodiment of the present invention, various vehicle control driving commands are issued in cooperation with the wearable smart key 100, the short range wireless communication device 200 and the ECM 300, 500a to 500n may be displayed on the display unit 400. [ For example, it is possible to confirm whether the door 1 and the trunk of the vehicle 1 are opened or closed on the display. That is, the input values of the sensors connected to the driving units 500a to 500n of the vehicle 1 are calculated by the ECM 300 and transmitted to the display unit 400.

3 and 7, the channel # 1 driving unit 500a to the channel # 4 driving unit 504 according to the embodiment of the present invention includes various actuators for driving the vehicle 1, (Electronic Stability Program), a transmission control unit (TCU), and the like, which correspond to sensors for detecting the operation functions of the ECM (Not shown) for driving the vehicle 1 and detecting data by driving the vehicle 1 through CAN (Controller Area Network) communication with the electronic control modules 300, 300 to be displayed on a vehicle instrument panel (not shown), the display unit 400, and the wearable smart key 100, respectively, so that information can be provided to the user.

Here, the CAN (Controller Area Network) communication according to the embodiment of the present invention can be applied to the automotive industry (Automotive Industry) to overcome the wiring problem of a point-to- ) Is a serial network multi-communication method. The CAN communication feature is that the CAN bus, which is commonly used in embedded systems (or microcontrollers), forms a communication network between microcontrollers (microcomputers) and is connected by a twisted pair wire, ) Scheme, which is suitable for high-speed application systems using short messages. In addition, it has robustness to external factors (noise, etc.) and has a high reliability by minimizing the communication error rate.

Theoretically, 2032 different devices (embedded controllers) can be connected to one network to perform communication, but due to the limitation of CAN transceiver (transmitter), up to 110 nodes (communication subject) can be connected and used . The communication speed is high speed communication of 1Mbps (ISO 11898 standard) which can be controlled in real time and error detection and error correction is applied to the severe noise environment such as automobile environment (various serious electrical noise in car engine room) Function.

The operation principle of CAN communication is multi master network and CSMA / CD + AMP (Carrier Sense Multiple Access / Collision Detection with Arbitration on Message Priority) method is used. First, it is similar to the Ethernet communication method that detects whether the CAN bus line is in use before sending a message to the CAN node, and performs collision detection between messages. In addition, the data message sent from a certain node (system) does not include the address of the sender or the receiver. On the other hand, in the data message item of each node, each node (system) (ID-11bit or 29bit) for each system (system). All nodes connected to the network (CAN Controller system) receive messages on the network, evaluate them through the identifiers of the messages they need, and then take them only if they are messages of identifiers that they need, . When the data of several nodes flowing on the network (CAN communication line) flows into the node which the user needs simultaneously, the number of the identifier is compared to determine the priority of the message to be taken first. In other words, when the number of identifiers is low, the highest priority is given (the identifier 1 is higher than when the number is 1). High priority messages are guaranteed to be used on the CAN bus, and low-priority messages automatically retransmit on the next bus cycle. At this time, if the message having a high priority is not completed yet, it waits until the transmission is completed. Each CAN message has an 11-bit identifier (CAN 2.0A) or a 29-bit identifier (CAN 2.0B) and is located at the very beginning of the CAN message. In addition, the identifier serves to identify the type of message and prioritize the message.

Therefore, in the embodiment of the present invention, the characteristic of the CAN communication allows the user to easily control the wearable smart key 100 at the remote place from the driver 500a to 500n for each channel of the vehicle.

As described above, when the ID and the RSSI value are transmitted to the LF radio waves from the diversity antennas 210 to 240 of the short range wireless communication device 200 installed in the vehicle 1, the wearable smart key system of the vehicle according to the present invention, A Real-Time Locating Service (RTLS) that gives an RSSI value corresponding to the reply data of the wearable smart key 100 worn by the user and correctly estimates the position of the wearable smart key 100 A concrete and practical communication algorithm can be implemented.

Accordingly, it is possible to control the driving parts 500a to 500n of the vehicle 1 by detecting the accurate position of the target value to be controlled in the room and at a close range by real-time position tracking between the vehicle 1 and the wearable smart key 100. [

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

1: vehicle
100: Wearable smart key
101: Channel # 1 control signal transmission unit 102: Channel # 2 control signal transmission unit
103: Channel # 3 control signal transmission unit 104: Channel # 4 control signal transmission unit
105: receiving antenna 106: transmitting antenna
107: Battery 108: Time adjustment button
109: GPS reception antenna 110: smartphone button
200: near field wireless communication device 210: first diversity antenna
220: second diversity antenna 230: third diversity antenna
300: ECM
310: ROM 320: RAM
400:
500a: Channel # 1 driver 500b: Channel # 2 driver
500c: channel # 3 driver 500d: channel # 4 driver
500n: channel #n driver

Claims (11)

A wearable smart key that transmits wearable wearable wearable type wearer control signals so that each drive unit of the vehicle can be controlled according to an action of the user in the proximity of the vehicle, (RSSI) MAP is transmitted to LF (Low Frequency) propagation through the wearable smart key, and an RSSI value is given to each RF DATA returned from the wearable smart key to set the position of the wearable smart key And a short range wireless communication device having a Real-Time Location Service (RTLS) for estimating in real time,
The short-
Transmitting each RSSI MAP together with a unique ID periodically to track an accurate position of the wearable smart key in real time through a plurality of diversity antennas, and transmitting each RSSI returned from the wearable smart key DATA is periodically received, RSSI values are respectively given,
In order to avoid collision with each other, each of the diversity antennas is connected to an adjacent wearable smart key, and a time division multiple access (TDMA) scheme is used in which a Bust sequence is sequentially transmitted so that signals do not overlap with time at the same signal carrier frequency. Access) method,
The short-range location tracking service of the short-
A distance value between each diversity antenna as a reference point serving as a reference point on a two-dimensional plane and the wearable smart key as a mobile node is measured by a triangulation method using the RSSI MAP, Estimating the position,
Wherein the RSSI MAP of each of the diversity antennas of the short-
ANT1 (x1, y1, z1), ANT2 (x2, y2, z2) and ANT3 (x3, y3, z3)
Each of the RF DATAs of the wearable smart key,
(Xx1, yy1, zz1), ANT2 (xx2, yy2, zz2) and ANT3 (xx3, yy3, zz3) corresponding to the RSSI MAPs of the respective diversity antennas of the short-
The wearable smart key includes:
A GPS receiving antenna and a smartphone button are provided so that a vehicle management service can be provided in connection with a public network or a private network of a car maintenance company through a vehicle management application. Wearable smart key system of vehicle.
The method according to claim 1,
In the triangulation method using the RSSI MAP,
(X1, y1, z1), (x2, y2, z2), (x2, y2, z2) of three reference points with three reference points for each of the three diversity antennas for real-time position estimation of the wearable smart on a two- (x3, y3, z3)] is an RSSI MAP included in an LF radio wave transmitted from each of the diversity antennas, and the coordinates of each of the three reference points and the coordinates of the mobile node of the wearable smart key ) respective distances between d 1, d 2 and d 3 is wearable smart key system of the vehicle, characterized in that determined by the equation below.
Figure 112015066360696-pat00009

Figure 112015066360696-pat00010

Figure 112015066360696-pat00011

 The method according to claim 1,
ECM (Electronic Control Modules) for storing the control signals of the wearable smart key mediated from the near field wireless communication device in the RAM and for controlling the driving devices of the channel # 1 and the channel #n, The wearable smart key system of the vehicle.
delete delete delete The method according to claim 1,
The wearable smart key includes:
Wherein the mobile terminal is switched to a vehicle control mode when it is close to a radio wave area transmitted from a diversity antenna of the short range wireless communication device and is switched to a normal mode when it is deviated from the radio wave area.
8. The method of claim 7,
The wearable smart key includes:
A wristwatch worn on the wrist of the user,
In the normal mode,
Perform clock-specific functions,
The vehicle control mode includes:
And controls each driving unit of the vehicle according to an action of the user.
The method of claim 3,
The wearable smart key includes:
A transmitting antenna and a receiving antenna transmitting and receiving the short range wireless communication device,
A channel # 1 control signal transmitting unit or a channel #n control for transmitting the control signals to the short-range wireless communicator through the transmission antenna so that the ECM controls the channel # 1 driving unit and the channel #n driving unit, And a signal transmission unit.
10. The method of claim 9,
The channel # 1 control signal transmitter includes:
A control signal for opening and closing the seat door of the vehicle is transmitted,
Wherein the channel # 2 control signal transmitter comprises:
A control signal for opening and closing a trunk door of the vehicle is transmitted,
The channel # 3 control signal transmitter includes:
A control signal for opening the bonnet of the vehicle is transmitted,
The channel # 4 control signal transmitter includes:
Wherein a control signal for turning on and off the vehicle is transmitted.
delete
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