KR101743646B1 - Smart key system implemented using by three antennas and vehicle control method in control unit of the system - Google Patents

Smart key system implemented using by three antennas and vehicle control method in control unit of the system Download PDF

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Publication number
KR101743646B1
KR101743646B1 KR1020100121499A KR20100121499A KR101743646B1 KR 101743646 B1 KR101743646 B1 KR 101743646B1 KR 1020100121499 A KR1020100121499 A KR 1020100121499A KR 20100121499 A KR20100121499 A KR 20100121499A KR 101743646 B1 KR101743646 B1 KR 101743646B1
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South Korea
Prior art keywords
smart key
antenna
vehicle
control unit
command
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KR1020100121499A
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Korean (ko)
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KR20120059972A (en
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박용희
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현대모비스 주식회사
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Abstract

A smart key system implemented with three antennas is disclosed. The smart key system comprises a first antenna disposed at the front and rear center of the inner loop of the vehicle, and a third antenna arranged to partially overlap a communication area between the second antenna and the second antenna, so as to cover the vehicle interior area and the outdoor area around the vehicle The smart key is transmitted to the vehicle interior area or the vehicle outdoor area through the received signal strength indication (RSSI) value between the smart key, the first antenna, and the antenna of either the second antenna or the third antenna. And a control unit for judging whether or not there is an abnormality. As a result, it is possible to reduce the number of wires between the electronic control unit (ECU) and the antenna to six sets to three sets, thereby enabling cost reduction.

Description

TECHNICAL FIELD The present invention relates to a smart key system implemented using three antennas and a vehicle control method implemented in a control unit of the smart key system.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system implemented in a vehicle, and more particularly, to a smart key system for performing operations such as door opening of a vehicle through communication with a smart key.

Smart Key systems are well known. A smart key system is a system in which, when a driver takes necessary actions while possessing a smart key, it senses this in a system built in the vehicle and controls the operation of the vehicle (for example, opening the driver's door, opening the trunk, . Here, the smart key is usually called a 'Fob key', which is simply called Fob. Conventionally, such a smart key system includes six LF (Low Frequency) antennas to cover the vehicle interior area as well as the outdoor area around the vehicle to the communication possible area. The smart key system performs smart key indoor / outdoor discrimination through six LF antennas and performs driver / assist / trunk passive access function. However, if you use six LF antennas, the price of the smart key system is expensive because of the pricing part of the harness that connects the smart key electronic control unit and six LF antennas, although it is a priceless part of its own.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a smart key system capable of performing indoor / outdoor discrimination of smart keys and driver / assist / trunk passive access functions while reducing the number of antennas.

According to an aspect of the present invention, there is provided a smart key system including a first antenna disposed at a front-rear center of a vehicle inner loop, a third antenna disposed to partially overlap a communication area between the second antenna and the second antenna, And an antenna unit configured to cover the vehicle interior and the outdoor area around the vehicle, and an antenna unit configured to receive signal strength between the smart key, the first antenna, the second antenna, and the third antenna, ) Value to determine whether the smart key is in the vehicle interior area or the vehicle exterior area.

According to one aspect of the present invention, when the driver's seat door button switch is turned on, the control unit transmits a driver's seat door open command to the smart key when it is determined that the driver's seat door button switch is on the vehicle outside area through the RSSI value between the smart key and the first antenna, If the RSSI value of the first transmission output of the smart key corresponding to the command is equal to or greater than the reference value, the driver's seat door is open-controlled.

According to one aspect of the present invention, when the passenger seat door button switch is turned on, the control unit transmits the passenger door open command to the smart key when it is determined that the passenger door door switch is in the vehicle outside area through the RSSI value between the smart key and the first antenna, If the RSSI value of the second transmission output of the smart key corresponding to the command is less than the reference value and is equal to or greater than a predetermined value, the passenger door is opened.

According to an aspect of the present invention, there is provided a communication system including a first antenna disposed at the front and rear center of an inner loop of a vehicle, a third antenna disposed to partially overlap a communication area between the second antenna and the second antenna, A vehicle control method performed in a control unit of a smart key system that covers an interior area of a vehicle and an outdoor area around the vehicle includes the steps of generating a smart key through the RSSI value between the smart key and the first antenna when the driver's door button switch is on Determining whether the smart key is located in a vehicle exterior area; transmitting an open door command to the driver's seat using a smart key if the smart key is determined to be in a vehicle outdoor area; Determining whether the RSSI value is equal to or greater than a threshold value, And opening the stone door.

According to the present invention, the number of antennas can be reduced to three and the cost can be reduced. In addition, the number of wires between the electronic control unit and the antenna can be reduced from 6 sets to 3 sets, thereby reducing cost.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows three antenna layouts disposed in a vehicle in accordance with an embodiment of the present invention.
2 is a block diagram of a smart key system according to an embodiment of the present invention;
3 is a reference graph for explaining passive access control according to the RSSI value of the control unit shown in Fig.
4 is a flowchart of a vehicle control method performed in a control unit of a smart key system.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating three antenna layouts disposed in a vehicle in accordance with an embodiment of the present invention.

The first antenna ANT1 110 is disposed at the front center of the vehicle interior loop and the second antenna ANT2 120 is disposed at the rear center of the vehicle interior loop. The third antenna 130 is disposed to partially overlap the communication area of the second antenna 120, for example, in a trunk or in a console box. Each ellipse represents the communicable area of the antenna. As shown, such an antenna arrangement covers the vehicle interior area and the outdoor area around the vehicle with a communicable area.

2 is a block diagram of a smart key system according to an embodiment of the present invention.

As shown, the smart key system includes an antenna unit 210 and a control unit 220. The antenna unit 210 includes a first antenna 110, a second antenna 120, and a third antenna 130. In one embodiment, these antennas are LF (Low Frequency) antennas, and the in-vehicle arrangement of these antennas is as illustrated in FIG. The control unit 220 is an electronic control unit (ECU). The control unit 220 performs indoor / outdoor discrimination of the smart key 230 and passive access of the driver's seat / passenger seat / trunk through software control.

First, indoor and outdoor discrimination will be described. The control unit 220 determines whether the smart key 230 is located in the vehicle interior area or the vehicle outdoor area through the RSSI value between the smart key 230 and one of the antennas belonging to the antenna unit 210. [ To this end, the control unit 220 extracts the RSSI value between the three antennas and the smart key 230 with respect to the entire area of the vehicle interior that is the boundary between the vehicle interior and the exterior, And sets an RSSI reference value that serves as a reference for determining whether or not there is an area. Here, the reference value may be designated by the developer and preferably stored in advance in the memory of the control unit 220 through sufficient testing. Therefore, the control unit 220 compares the RSSI value between the three antennas and the smart key 230 with the reference value, and if the RSSI value is higher than the reference value, the control unit 220 determines that the smart key 230 is in the vehicle interior area, Is less than the reference value, it is determined that the smart key 230 is located in the outdoor area of the vehicle.

Hereinafter, the driver / assist passive access function will be described. The control unit 220 implements the passenger access function of the driver / passenger seat using the vehicle outdoor communication area between the first antenna 110 and the smart key 230. However, since the arrangement of the first antenna 110 in the vehicle is located at the center of the vehicle reference, it is difficult to distinguish between the driver's seat side and the passenger's seat side. In order to solve this problem, a smart key 230 having a transmission output binarized is used. Hereinafter, a driver's seat passive access using the smart key 230 in which the transmission output is binarized (a function for the user to open the door by pressing the driver's door button switch) will be described first.

When the driver's door button switch is turned on (i.e., the user presses the driver's door button switch), the control unit 220 senses this. At this time, the control unit 220 extracts the RSSI value between the smart key 230 and the first antenna 110. If the RSSI value is lower than the reference value, the control unit 220 determines that the smart key 230 is in the vehicle outdoor area communicable with the first antenna 110. If it is determined that the smart key 230 is in the vehicle outdoor area communicable with the first antenna 110, the control unit 220 transmits the driver's door open command to the smart key 230 via the first antenna 110 do. The smart key 230 receives the driver's door open command and responds to the control unit 220 with the first transmission output in response to the received command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, checks whether the extracted RSSI value is equal to or greater than a predetermined threshold value, and performs control for opening the driver's seat door when the extracted RSSI value is equal to or greater than the threshold value. That is, the control unit 220 performs a driver passive access function when the received RSSI value is equal to or greater than the threshold value as shown in FIG.

A passive passive access (a function for the user to open the door by pressing the passenger seat door button switch) using the smart key 230 in which the transmission output is binarized will be described. When the passenger door button switch is turned on (that is, when the user pushes the passenger door button switch), the control unit 220 senses this. At this time, the control unit 220 extracts the RSSI value between the smart key 230 and the first antenna 110. If the RSSI value is lower than the reference value, the control unit 220 determines that the smart key 230 is in the vehicle outdoor area communicable with the first antenna 110. The control unit 220 transmits the passenger door open command to the smart key 230 through the first antenna 110 when the smart key 230 is determined to be in the vehicle outdoors area communicable with the first antenna 110 do. The smart key 230 receives the front passenger door open command and responds to the control unit 220 at the second transmission output in response to the received command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, and checks whether the extracted RSSI value is lower than a preset threshold value. If the extracted RSSI value is lower than the threshold value, the control unit 220 performs control for opening the passenger seat door do. That is, the control unit 220 performs the assist passive access function when the received RSSI value is smaller than the threshold value as shown in FIG.

Hereinafter, the trunk passive access function will be described. When the trunk open button switch is turned on (i.e., the user presses the trunk open button), the control unit 220 detects this. At this time, the control unit 220 extracts the RSSI value between the smart key 230 and the second antenna 120. If the RSSI value is lower than the reference value, the control unit 220 determines that the smart key 230 is in the vehicle outdoor area communicable with the second antenna 120. The control unit 220 transmits a trunk open command to the smart key 230 through the second antenna 120 when it is determined that the smart key 230 is in a vehicle outdoor area communicable with the second antenna 120 . The smart key 230 receives the trunk open command and responds to the control unit 220 with a transmission output corresponding to the command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, and checks whether the extracted RSSI value is equal to or greater than a preset threshold value. If the extracted RSSI value is equal to or greater than the threshold value, the control unit 220 performs control for trunk open. If the outdoor communication area between the third antenna 130 and the smart key 230 is wider than the outdoor communication area between the second antenna 120 and the smart key 230, ). It is preferable that whether to use the second antenna 120 or the third antenna 130 for the trunk passive access function is predetermined.

4 is a flowchart of a vehicle control method performed in the control unit of the smart key system.

The control unit 220 detects that the driver's door button switch, the passenger's door button switch or the trunk button switch is turned on (S610). If the driver's door button switch is turned on, the control unit 220 extracts the RSSI value between the smart key 230 and the first antenna 110 and compares the extracted RSSI value with a reference value (S621) S622). If the RSSI value is smaller than the reference value, the control unit 220 transmits the driver's door open command to the smart key 230 via the first antenna 110 (S623). The smart key 230 receives the driver's door open command and responds to the control unit 220 with the first transmission output in response to the received command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, checks whether the extracted RSSI value is equal to or greater than a predetermined threshold value, and performs control for opening the driver's seat door S624) (S625) (S626).

The control unit 220 extracts the RSSI value between the smart key 230 and the first antenna 110 and compares the extracted RSSI value with the reference value in step S631 S632). If the RSSI value is smaller than the reference value, the control unit 220 transmits the passenger door open command to the smart key 230 via the first antenna 110 (S633). The smart key 230 receives the front passenger door open command and responds to the control unit 220 at the second transmission output in response to the received command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, checks whether the extracted RSSI value is less than a predetermined threshold value, and performs control for opening the driver's seat door if the value is below the threshold value S634) (S635) (S636).

If the trunk button switch is turned on, the control unit 220 extracts the RSSI value between the smart key 230 and the second antenna 110 or the third antenna 130, and if the extracted RSSI value is smaller than the reference value (S641) (S642). If the RSSI value is smaller than the reference value, the control unit 220 transmits a trunk open command to the smart key 230 through the second antenna 120 or the third antenna 130 (S643). The smart key 230 receives the trunk open command and responds to the control unit 220 with the transmission output in response to the received command. The control unit 220 extracts the RSSI value of the transmission output of the smart key 230, checks whether the extracted RSSI value is equal to or greater than a predetermined threshold value, and performs control for opening the driver's seat door S644) (S645) (S646).

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

110: first antenna 120: second antenna
130: Third antenna 210:
220: control unit 230: smart key

Claims (6)

A first antenna disposed at the front and rear center of the inner loop of the vehicle, a second antenna, and a third antenna disposed to partially overlap a communication area of the second antenna, ; And
The mobile terminal determines whether the smart key is located in a vehicle interior area or a vehicle outdoor area through a smart key and a Received Signal Strength Indication (RSSI) value between the first antenna, the second antenna and the third antenna. A control unit,
The first to third antennas transmit and receive signals to and from the smart key,
Wherein the control unit transmits a command to the smart key through one of the first to third antennas when it is determined that the smart key is located in the vehicle outdoors area and transmits the command to the smart key from the smart key corresponding to the transmitted command Controls the driver's seat door open or trunk open according to the type of the command if the RSSI value of the transmission output of the driver is greater than or equal to a threshold value,
Wherein the smart key responds with a first transmission output or a second transmission output according to the type of the command. The method according to claim 1,
When the driver's seat door button switch is turned on, the control unit displays the driver's door door open command through the first antenna with the smart key when it is determined that the driver's seat door button switch is on the vehicle outside area through the received signal strength value between the smart key and the first antenna And controls the driver's seat door to be opened if the RSSI value of the first transmission output from the smart key corresponding to the transmitted command is equal to or greater than a threshold value. . The method according to claim 1,
When the passenger seat door button switch is turned on, the control unit determines that the passenger door door open command is transmitted to the first antenna through the smart key when it is determined that the passenger door door switch is in the vehicle outdoors region based on the received signal strength value between the smart key and the first antenna When the RSSI value for the second transmission output from the smart key corresponding to the transmitted command is less than a threshold value, the passenger door is opened and controlled. The smart key system implemented using the three antennas . The method according to claim 1,
When the trunk button switch is turned on, the control unit determines that the trunk button switch is in the vehicle outdoors region based on the received signal strength value between the smart key and the second antenna or the received signal strength value between the smart key and the third antenna, Transmits a trunk open command through the second antenna or the third antenna with the smart key, and when the RSSI value for the first transmission output from the smart key corresponding to the transmitted command is equal to or greater than a threshold value, A smart key system implemented using three antennas characterized by the following: The smart key system according to any one of claims 1 to 4, wherein the first antenna, the second antenna and the third antenna are LF (Low Frequency) antennas. A first antenna disposed at the front and rear center of the inner loop of the vehicle, a second antenna, and a third antenna arranged to partially overlap a communication area of the second antenna, covering the vehicle interior area and the outdoor area around the vehicle, A method of controlling a vehicle in a control unit of a smart key system in which first to third antennas transmit and receive signals to and from a smart key,
Determining whether the smart key is in a vehicle outdoors area based on Received Signal Strength Indication (RSSI) values between the smart key and one of the first to third antennas;
Transmitting a command to the smart key through one of the first to third antennas when it is determined that the smart key is in the vehicle outdoors area;
Confirming whether the RSSI value of the transmission output transmitted from the smart key and received in response to the transmitted command is equal to or greater than a threshold value;
If the RSSI value of the transmission output is equal to or greater than the threshold, opening the driver's seat door or opening the trunk according to the type of the command; And
And opening the passenger seat door if the RSSI value of the transmission output is less than the threshold value,
Wherein the smart key responds with a first transmission output or a second transmission output according to the type of the command.
KR1020100121499A 2010-12-01 2010-12-01 Smart key system implemented using by three antennas and vehicle control method in control unit of the system KR101743646B1 (en)

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KR20140145837A (en) 2013-06-14 2014-12-24 현대자동차주식회사 Smart key apparatus and method for processing signal thereof
KR102109194B1 (en) * 2013-09-24 2020-05-11 콘티넨탈 오토모티브 시스템 주식회사 Fob detecting system of vehicle and method thereof
KR101766040B1 (en) 2015-09-18 2017-08-07 현대자동차주식회사 Battery charging control system and method for vehicle
CN107662579A (en) * 2016-07-27 2018-02-06 华晨汽车集团控股有限公司 A kind of keyless entry activation system low-frequency calibration and the method for searching Intelligent key
KR102090788B1 (en) * 2018-08-27 2020-03-18 현대자동차주식회사 Vehicle and control method thereof

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JP2003106019A (en) * 2001-09-28 2003-04-09 Honda Motor Co Ltd Remote-control system for car
JP2004263447A (en) * 2003-03-03 2004-09-24 Omron Corp Remote control system for vehicle

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2003106019A (en) * 2001-09-28 2003-04-09 Honda Motor Co Ltd Remote-control system for car
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