CN112838901A - PEPS system field intensity calibration method and system - Google Patents

PEPS system field intensity calibration method and system Download PDF

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Publication number
CN112838901A
CN112838901A CN201911159820.4A CN201911159820A CN112838901A CN 112838901 A CN112838901 A CN 112838901A CN 201911159820 A CN201911159820 A CN 201911159820A CN 112838901 A CN112838901 A CN 112838901A
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low
rssi
test points
frequency antenna
value
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程鹏
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Nanjing Tacking Automobile Electronic Co ltd
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Nanjing Tacking Automobile Electronic Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00896—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The invention discloses a field intensity calibration method of a PEPS system and the field intensity calibration system of the PEPS system, wherein the field intensity calibration method of the PEPS system is suitable for the field intensity calibration system of the PEPS system, and comprises the following steps: marking all test points of the vehicle body at equal intervals; establishing a test data table according to the test points in the action areas of the low-frequency antennas; acquiring RSSI values of all test points; calculating a threshold value of the RSSI value; and determining the position of the intelligent key according to the threshold value of the RSSI value. The PEPS system field intensity calibration system comprises a plurality of low-frequency antennas, an intelligent key, a vehicle body controller and a display, wherein the low-frequency antennas, the intelligent key, the vehicle body controller and the display are electrically connected. According to the method, the intelligent key is used as a measurement tool for field intensity calibration of the PEPS system, and the space inside and outside the vehicle is divided through the action area of the low-frequency antenna, so that compared with a conventional PEPS system field intensity calibration method, the calibration workload is reduced, and the calibration speed is improved.

Description

PEPS system field intensity calibration method and system
Technical Field
The invention relates to the technical field of automobile electric control, in particular to a field intensity calibration method of a PEPS system and a field intensity calibration system of the PEPS system.
Background
With the development of automotive electronic systems, the traditional mechanical key and mechanical lock approach has been gradually replaced by a Passive Entry Passive Start (PEPS) system. When the key is in the effective range, the car owner pulls the car door or presses a key to start the switch, and the corresponding module sends an interrupt signal to wake up the main controller to start the whole communication process. The whole process does not need to use a key, the vehicle door can be opened or the engine can be started, and interestingness and technological sense are increased. In the current PEPS calibration method, how to accurately control the distance and control the PEPS effective area is not described in detail, and the field intensity values of each point are obtained according to the distribution of the low-frequency antennas in the vehicle body, the trend of the Received Signal Strength Indication (RSSI) field intensity change, and the distribution points which are relatively dense.
However, the calibration method is complicated and time-consuming, especially along with the continuous acceleration of the engineering research and development speed of modern automobiles, the research and development period of a new automobile model is greatly shortened, and the traditional calibration method cannot meet the requirements of the existing market. Therefore, it is necessary to provide a simple and efficient field intensity calibration method for a PEPS system with low cost and accurate calibration result, so as to solve the problems in the existing calibration method.
Disclosure of Invention
The invention provides a PEPS system field intensity calibration method and a PEPS system field intensity calibration system which are simple, efficient, low in cost and accurate in calibration result. The technical scheme is as follows:
a field intensity calibration method of a PEPS system is applied to the field intensity calibration system of the PEPS system, the field intensity calibration system of the PEPS system comprises a plurality of low-frequency antennas, an intelligent key, a vehicle body controller and a display, and the field intensity calibration method of the PEPS system comprises the following steps:
marking all test points of the vehicle body at equal intervals;
establishing a test data table according to the test points in the action areas of the low-frequency antennas;
acquiring RSSI values of all test points;
calculating a threshold value of the RSSI value;
and determining the position of the intelligent key according to the threshold value of the RSSI value.
The method for quickly calibrating the PEPS low-frequency system reduces the measurement times of the RSSI value of the test point, reduces the workload of field intensity calibration of the PEPS system and shortens the calibration time of the PEPS system by dividing the action area of the low-frequency antenna. In addition, the automobile intelligent key is used as a measuring device for the RSSI value of the test point, so that the measuring device calibrated by the PEPS system is simplified, and the threshold and the professionality of the calibration of the PEPS system are reduced. The problems that the conventional PEPS system is complex in calibration process, high in cost, high in professional requirement and long in time are solved.
Wherein, the step of all test points of equidistance mark automobile body includes:
marking all test points of the space in the vehicle at equal intervals;
all test points of the space outside the vehicle are marked at equal intervals.
The step of establishing a test data table according to the test points in the action areas of the plurality of low-frequency antennas comprises the following steps:
dividing a space area in the vehicle;
dividing a space area outside the vehicle;
and establishing a test data table corresponding to the test points.
The step of obtaining the RSSI values of all the test points comprises:
testing the RSSI values of all the test points;
and recording the RSSI values of all the test points.
Wherein the step of calculating the threshold value of the RSSI value comprises:
determining the minimum value of RSSI values corresponding to all test points in the car;
determining the maximum value of RSSI values corresponding to all test points outside the vehicle;
and calculating the threshold value of the RSSI value according to the maximum value and the minimum value.
Wherein the step of determining the location of the fob according to the threshold value of the RSSI values comprises:
acquiring an RSSI value of the position where the intelligent key is located;
comparing the threshold value of the RSSI value with the RSSI value of the position where the intelligent key is located;
if the RSSI value of the position of the intelligent key is greater than the threshold value of the RSSI value, the intelligent key is in the vehicle;
and if the RSSI value of the position of the intelligent key is smaller than the threshold value of the RSSI value, the intelligent key is outside the vehicle.
After the step of obtaining the RSSI values of all the test points, the method for calibrating the field strength of the PEPS system further includes: judging whether the position of the second low-frequency antenna is adjusted: if the difference value of the RSSI values of the test points at the symmetrical positions on the two sides in the action area of the second low-frequency antenna is larger than a preset range, adjusting the position of the second low-frequency antenna, and executing the step of obtaining the RSSI values of all the test points again; if the RSSI values of the test points at the symmetrical positions on the two sides in the second low-frequency antenna area are equal, the position of the second low-frequency antenna does not need to be adjusted.
After the step of calculating the threshold of the RSSI value, the method for calibrating the field strength of the PEPS system further includes: and correcting the threshold value of the RSSI value.
The invention also provides a system for calibrating the field intensity of the PEPS system, which comprises a plurality of low-frequency antennas, an intelligent key, a vehicle body controller and a display, wherein the low-frequency antennas, the intelligent key, the vehicle body controller and the display are electrically connected, and the system comprises:
the low-frequency antenna is used for sending low-frequency signals and dividing the automobile into an automobile space and an automobile space;
the intelligent key is used for receiving a low-frequency signal sent by the low-frequency antenna and a test signal sent by the automobile body controller, and is also used for calculating an RSSI value corresponding to the test point and sending an RSSI value signal of the test point;
the vehicle body controller is used for sending a test signal to the intelligent key, sending an RSSI value signal of the test point to the display and receiving the RSSI value signal of the test point sent by the intelligent key;
the display is used for receiving the RSSI value signals of the test points sent by the automobile body controller and displaying the numerical values of the RSSI value signals of the test points.
The low-frequency antenna comprises a first low-frequency antenna, a second low-frequency antenna and a third low-frequency antenna, wherein the first low-frequency antenna and the third low-frequency antenna are A-type antennas, and the second low-frequency antenna is a B-type antenna.
The field intensity calibration system of the PEPS system provided by the invention has the advantages that the intelligent key of the automobile is used as the measuring device of the RSSI value of the test point, the measuring device for the PEPS system calibration is simplified, and the threshold and the professional degree of the PEPS system calibration are reduced. Therefore, the problems that the conventional PEPS system is complicated in calibration process, high in cost, high in professional requirement and long in time are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit structure of a field intensity calibration system of a PEPS system provided by the present invention;
FIG. 2 is a schematic diagram of an automotive low frequency antenna arrangement;
FIG. 3 is a flowchart of a method for calibrating field strength of a PEPS system according to the present invention;
FIG. 4 is a flowchart of step S10 shown in FIG. 3;
FIG. 5 is a flowchart of step S20 shown in FIG. 3;
FIG. 6 is a flowchart of step S30 shown in FIG. 3;
fig. 7 is a flowchart of step S40 shown in fig. 3;
fig. 8 is a flowchart of step S50 shown in fig. 3;
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as, for example, "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used herein for better and clearer illustration and understanding of the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. It should be noted that the terms "first", "second", and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The invention discloses a field intensity calibration method of a PEPS system and a field intensity calibration system of the PEPS system. The field intensity calibration method of the PEPS system and the field intensity calibration system of the PEPS system reduce the threshold and the specialty of field intensity calibration of the PEPS system by using an automobile intelligent key as a test device, reduce the workload of field intensity calibration test of the PEPS system by dividing an action area through a low-frequency antenna, shorten the test time, and solve the problems that the existing PEPS calibration method is complicated in program and long in time consumption, and cannot meet the requirements of high research and development speed and greatly shortened research and development period of modern automobiles.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a field intensity calibration system of a PEPS system provided by the present invention. In this embodiment, the field intensity calibration system of the PEPS system at least includes a plurality of low-frequency antennas, a smart key, a vehicle body controller, and a display, and the low-frequency antennas, the smart key, the vehicle body controller, and the display may be connected through a controller area network CAN bus.
In this embodiment, the low-frequency antenna may be used as a signal transmitting device, as a reference mark for dividing a vehicle space, and is specifically used for transmitting a low-frequency signal, and for dividing the vehicle into a vehicle space and a vehicle space. Specifically, the low-frequency antenna transmits a low-frequency signal covering the entire vehicle body and a certain range around the vehicle body, and divides the vehicle into a vehicle interior space and a vehicle exterior space according to an action area of the low-frequency signal.
In this embodiment, according to the requirement of field intensity calibration of the PEPS system, the number of the low-frequency antennas may be designed to be 3, that is, the plurality of low-frequency antennas may include a first low-frequency antenna, a second low-frequency antenna, and a third low-frequency antenna. Accordingly, the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna divide the space inside the vehicle and the space outside the vehicle into three active regions with the installation positions thereof, and transmit corresponding low-frequency signals. Based on the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna, three action regions are formed to have corresponding field strength values.
In this embodiment, the first low-frequency antenna and the third low-frequency antenna are a class a antennas, and the second low-frequency antenna is a class B antenna.
Specifically, the first low-frequency antenna is located at a position of an automobile instrument panel, and an active area of the first low-frequency antenna is as follows: the in-vehicle active area of the first low frequency antenna comprises: the instrument desk, the left front floor, the right front floor, the left front door and the right front door; the outboard region of action of the first low frequency antenna comprises: windshield, main and auxiliary driving glass.
Specifically, the second low-frequency antenna is located at an intermediate position of the IMMO, and an active area of the second low-frequency antenna is: the in-vehicle active region of the second low frequency antenna comprises: the front windshield, the main and auxiliary driving glasses, the main and auxiliary driving door slots and the main and auxiliary driving door handles; the outboard region of action of the second low frequency antenna comprises: entertainment panel storing box, center console, central armrest case, left front seat, right front seat, left front seat floor, right front seat floor, instrument desk, left front floor, right front floor, left front door, right front door.
Specifically, the third low-frequency antenna is located in the middle of the rear seat, and the action area of the third low-frequency antenna is as follows: the in-vehicle active region of the third low frequency antenna comprises: a floor in front of the left rear seat, a floor in front of the right rear seat, a rear row floor bulge, a trunk, and a platform between the rear seat and the rear windshield; the external action area of the third low-frequency antenna comprises: left back door glass and small window glass, right back door glass and small window glass, left back door seam and door handle, right back door seam and door handle, rear windshield.
In this embodiment, the smart key may be used as a signal transceiver, and may also be used as a device for calculating an RSSI value, and is specifically configured to receive a low-frequency signal sent by the low-frequency antenna and a test signal sent by the vehicle body controller, and also configured to calculate an RSSI value corresponding to a test point, and also configured to send an RSSI value signal of the test point measured by the smart key. Specifically, the intelligent key is moved to the test point, receives a low-frequency signal sent by a low-frequency antenna and a test signal sent by the vehicle body controller, calculates an RSSI value of the test point, and then sends an RSSI value signal of the test point.
In this embodiment, the vehicle body controller may be used as a signal sending device, and may also be used as a signal receiving device, which is specifically configured to send a test signal to the smart key and an RSSI value signal of a sending test point, and is also configured to receive the RSSI value signal of the test point sent by the smart key. Specifically, the vehicle body controller sends a test signal to the smart key, receives an RSSI value signal of the test point sent by the smart key, and then sends out the received RSSI value signal of the test point.
In this embodiment, the display may be used as a signal receiving device, or may be used as a display device, which is specifically configured to receive the RSSI value signal of the test point sent by the vehicle body controller, or may be used to display the value of the received RSSI value signal of the test point. Specifically, the display receives the RSSI value signals of the test points sent by the vehicle body controller, and displays the numerical values of the received RSSI value signals of the test points on a display screen.
Referring to fig. 2, fig. 2 is a schematic diagram of a low-frequency antenna arrangement of an automobile. As shown in the drawing, where LF denotes a main driver glass window, RF denotes a sub driver glass window, LR denotes a left rear window, RR denotes a right rear window, FW denotes a front windshield, RW denotes a rear windshield, 1 denotes a first low-frequency antenna, 2 denotes a second low-frequency antenna, and 3 denotes a third low-frequency antenna.
Referring to fig. 3, fig. 3 is a flowchart of a field strength calibration method for a PEPS system according to the present invention. In this embodiment, the method for calibrating the field intensity of the PEPS system is applicable to the field intensity calibration system of the PEPS system, and the method for calibrating the field intensity of the PEPS system at least includes the following steps:
step S10, marking all test points of the car body at equal intervals;
specifically, the test point is a preset vehicle body space point, and specifically may be an intersection of longitudinal and transverse straight lines arranged at equal intervals in the vehicle body space. The test points comprise an in-vehicle test point and an out-vehicle test point.
In this embodiment, the step S10 at least includes the following steps:
step S11, marking all test points of the space in the vehicle at equal intervals;
specifically, a square grid composed of squares with a certain side length is adopted to divide the space in the vehicle into a plurality of small grid spaces, and intersection points of all the grid spaces are test points.
Wherein, the interior space of car includes: instrument desk, left front floor, right front floor, left front door, right front door, amusement panel storage box, center console box, left front seat, right front seat, left front seat floor, right front seat floor, floor before the left rear seat, floor before the right rear seat, back row floor hump, trunk, platform between rear seat and the rear windshield.
Step S12, marking all test points of the space outside the vehicle at equal intervals;
specifically, a square grid formed by squares with a certain side length is adopted to divide a space in a certain distance outside the vehicle into a plurality of small grid spaces, and intersection points of all the grid spaces are test points.
Wherein, the outer space of car includes: the door comprises a front windshield, main and auxiliary driving glasses, main and auxiliary driving door seams, a main and auxiliary driving door handle, left rear door glass and small window glass, right rear door glass and small window glass, a left rear door seam and a door handle, a right rear door seam and a door handle, and a rear windshield.
The space outside the vehicle needs to be added with a group of auxiliary test points, and the auxiliary test points are located at positions where the test points outside the vehicle translate for a certain distance. For example, the test point formed by the main and auxiliary driving glasses translating 5cm outwards in the direction parallel to the ground, and the test point formed by the rear windshield translating 30cm outwards in the direction parallel to the ground.
Step S20, establishing a test data table according to the test points in the action areas of the low-frequency antennas;
specifically, after all the spatial points of the vehicle body are marked at equal intervals, corresponding test data tables can be established according to different action areas acted by the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna. The test data table includes RSSI values of all test points in the active area of the low frequency antenna (i.e., the first low frequency antenna, the second low frequency antenna, and the third low frequency antenna).
In this embodiment, the step S20 at least includes the following steps:
step S21, dividing the space area in the vehicle;
specifically, the in-vehicle space is divided into an in-vehicle action region of a first low-frequency antenna, an in-vehicle action region of a second low-frequency antenna and an in-vehicle action region of a third low-frequency antenna corresponding to an area on which the low-frequency antenna acts;
wherein the in-vehicle active region of the first low frequency antenna may include: the instrument desk, the left front floor, the right front floor, the left front door and the right front door; the in-vehicle active region of the second low frequency antenna may include: the entertainment panel comprises an entertainment panel storage box, a center console, a center armrest box, a left front seat, a right front seat, a left front seat floor, a right front seat floor, an instrument desk, a left front floor, a right front floor, a left front door and a right front door; the in-vehicle active region of the third low frequency antenna may include: the rear seat comprises a floor in front of the left rear seat, a floor in front of the right rear seat, a rear row floor bulge, a trunk and a platform between the rear seat and a rear windshield.
Step S22, dividing the space area outside the vehicle;
specifically, the vehicle exterior space is divided into three parts, namely a vehicle exterior action area of the first low-frequency antenna, a vehicle exterior action area of the second low-frequency antenna and a vehicle exterior action area of the third low-frequency antenna, corresponding to an action area of the low-frequency antenna.
Wherein the outboard region of action of the first low frequency antenna may include: front windshield glass and main and auxiliary driving glass; the external action area of the second low-frequency antenna can comprise front windshield glass, main and auxiliary driving door slots and main and auxiliary driving door handles; the outboard region of action of the third low frequency antenna may include: left back door glass and small window glass, right back door glass and small window glass, left back door seam and door handle, right back door seam and door handle, rear windshield.
Step S23, establishing a test data table corresponding to the test point;
specifically, a corresponding test data table is correspondingly established according to the positions and the number of the test points, and the data content of the test data table includes the RSSI values of all the test points in the action area of the low-frequency antenna (i.e., the first low-frequency antenna, the second low-frequency antenna, and the third low-frequency antenna). It is to be understood that the test data table further includes: the number of the test points, the positions of the test points and the RSSI values of the corresponding test points and other data contents.
S30, obtaining RSSI values of all test points;
in this embodiment, the step S30 at least includes the following steps:
step S31, testing the RSSI values of all test points;
specifically, the RSSI value of a certain test point is first tested, and the method includes: the intelligent key is moved to the test point, then the intelligent key receives a low-frequency signal sent by a low-frequency antenna and a test signal sent by the automobile body controller, then the intelligent key calculates the RSSI value of the test point, the measured RSSI value of the test point is used as the RSSI value signal of the test point and sent to the automobile body controller, the automobile body controller receives the RSSI value signal of the test point and sends the RSSI value signal to the display, and finally the display receives the RSSI value signal of the test point sent by the automobile body controller and displays the RSSI value of the test point.
And repeatedly executing the test method to measure the RSSI values of all the test points.
Step S32, recording RSSI values of all test points;
specifically, the position of the test data table corresponding to the test point is found, and the measured RSSI value is recorded in the test data table according to the corresponding position.
It is understood that, in this embodiment, after the step S30 of acquiring RSSI values of all test points, the method may further include: judging whether the position of the second low-frequency antenna is adjusted or not;
specifically, if the difference between the RSSI values of the test points at the two symmetrical positions (e.g., two side glasses of an automobile) in the second low-frequency antenna action area is greater than a preset range, the position of the second low-frequency antenna needs to be adjusted, and the step S30 is executed again after the position of the second low-frequency antenna is adjusted, so that the RSSI values of the test points at the two symmetrical positions in the second low-frequency antenna action area are equal to each other; if the RSSI values of the test points at the symmetrical positions on both sides in the second low-frequency antenna region are equal, that is, the difference value is within the preset range, the position of the second low-frequency antenna does not need to be adjusted.
Step S40, calculating the threshold value of the RSSI value;
in this embodiment, the step S40 at least includes the following steps:
step S41, determining the minimum value of RSSI values corresponding to all the test points in the car;
specifically, the test data table is consulted, the RSSI value test results corresponding to all the test points in the vehicle are looked up, and the minimum value min of the RSSI values is found outIn-vehicle。
Step S42, determining the maximum value of RSSI values corresponding to all the test points outside the vehicle;
specifically, the test table is consulted, the RSSI value test results corresponding to all the test points outside the vehicle are looked up, and the maximum value max of the RSSI values is found outVehicle outer。
Step S43, calculating a threshold value of the RSSI value according to the maximum value and the minimum value;
specifically, extracting the minimum value min of RSSI values of all test points in the vehicleIn-vehicleAnd the maximum value max of the RSSI values of all the test points outside the vehicleVehicle outerAnd will be minIn-vehicleAnd maxVehicle outerSubstituting a threshold calculation formula: (min)In-vehicle-. DELTA.2).
Wherein, Δ is minIn-vehicle－maxVehicle outerDelta is the minimum value min of RSSI values of all test points in the vehicleIn-vehicleAnd the maximum value max of the RSSI values of all test points outside the vehicleVehicle outerThe difference of (a).
The action area of the second low-frequency antenna adopts an independent threshold, and the action area of the first low-frequency antenna and the action area of the third low-frequency antenna adopt the same threshold.
It is understood that, in this embodiment, after "step S40, calculating the threshold of the RSSI value", the method may further include: correcting the threshold value of the RSSI value:
in particular, because of the measurementThe body structures of different test vehicles with different system hardware and different types can be tested, and the threshold value of the RSSI value after being corrected can be smaller than the minimum value min of the RSSI values corresponding to all test points in the vehicle by multiplying the threshold value of the RSSI value by a correction coefficientIn-vehicleThe threshold value of the corrected RSSI value is larger than the maximum value max of the RSSI values corresponding to all the test points outside the vehicleVehicle outerAnd the threshold value of the first low-frequency antenna action area is equal to the threshold value of the third low-frequency antenna action area.
Step S50, determining the position of the intelligent key according to the threshold value of the RSSI value;
specifically, the position of the smart key is determined according to a comparison result between the RSSI value of the position of the smart key and the threshold value of the RSSI value.
In this embodiment, the step S50 at least includes the following steps:
step S51, obtaining the RSSI value of the position where the intelligent key is located;
specifically, the smart key is moved to any position where signals transmitted by a low-frequency antenna and a vehicle body controller can be received, and then the RSSI value of the position where the smart key is located is tested.
Step S52, comparing the RSSI value of the position of the intelligent key with the threshold value of the RSSI value;
specifically, the measured RSSI value of the location of the smart key is compared with the threshold value of the RSSI value, and the magnitude of the RSSI value of the location of the smart key and the threshold value of the RSSI value are determined.
Step S53, if the RSSI value of the position of the intelligent key is greater than the threshold value of the RSSI value, the intelligent key is in the car;
specifically, if the comparison result shows that the RSSI value of the location of the smart key is greater than the threshold value of the RSSI value, it is indicated that the location of the smart key is located in the vehicle;
step S54, if the RSSI value of the position of the intelligent key is smaller than the threshold value of the RSSI value, the intelligent key is outside the vehicle;
specifically, if the comparison result shows that the RSSI value of the location of the smart key is smaller than the threshold value of the RSSI value, it is indicated that the location of the smart key is outside the vehicle.
Compared with the prior art, the field intensity calibration method and system for the PEPS system provided by the embodiment reduce the measurement times of the RSSI values of the test points, reduce the workload of field intensity calibration of the PEPS system, and shorten the calibration time of the PEPS system by dividing the action area of the low-frequency antenna. In addition, the intelligent key is used as a measuring device for the RSSI value of the test point, the field intensity of the PEPS system can be calibrated only by connecting a display, and the threshold and the professionality of the PEPS system calibration are reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims shall not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A field intensity calibration method of a PEPS system is applied to the field intensity calibration system of the PEPS system, the field intensity calibration system of the PEPS system comprises a plurality of low-frequency antennas, an intelligent key, a vehicle body controller and a display, and the field intensity calibration method of the PEPS system comprises the following steps:
marking all test points of the vehicle body at equal intervals;
establishing a test data table according to the test points in the action areas of the low-frequency antennas;
acquiring RSSI values of all test points;
calculating a threshold value of the RSSI value;
and determining the position of the intelligent key according to the threshold value of the RSSI value.
2. The PEPS system field intensity calibration method according to claim 1, wherein the step of equidistantly marking all test points of a vehicle body comprises the steps of:
marking all test points of the space in the vehicle at equal intervals;
all test points of the space outside the vehicle are marked at equal intervals.
3. The PEPS system field intensity calibration method according to claim 2, wherein the step of establishing the test data table according to the test points in the action area of the plurality of low-frequency antennas comprises the steps of:
dividing a space area in the vehicle;
dividing a space area outside the vehicle;
and establishing a test data table corresponding to the test points.
4. The PEPS system field intensity calibration method according to claim 1, wherein the step of obtaining the RSSI values of all the test points comprises:
testing the RSSI values of all the test points;
and recording the RSSI values of all the test points.
5. The PEPS system field strength calibration method according to claim 1, wherein the step of calculating the threshold value of the RSSI value includes:
determining the minimum value of RSSI values corresponding to all test points in the car;
determining the maximum value of RSSI values corresponding to all test points outside the vehicle;
and calculating the threshold value of the RSSI value according to the maximum value and the minimum value.
6. The PEPS system field strength calibration method according to claim 1, wherein the step of determining the position of the smart key according to the threshold value of the RSSI value comprises:
acquiring an RSSI value of the position where the intelligent key is located;
comparing the threshold value of the RSSI value with the RSSI value of the position where the intelligent key is located;
if the RSSI value of the position of the intelligent key is greater than the threshold value of the RSSI value, the intelligent key is in the vehicle;
and if the RSSI value of the position of the intelligent key is smaller than the threshold value of the RSSI value, the intelligent key is outside the vehicle.
7. The PEPS system field strength calibration method according to claim 1, wherein after the step of obtaining the RSSI values of all the test points, the PEPS system field strength calibration method further comprises: judging whether the position of the second low-frequency antenna is adjusted: if the difference value of the RSSI values of the test points at the symmetrical positions on the two sides in the action area of the second low-frequency antenna is larger than a preset range, adjusting the position of the second low-frequency antenna, and executing the step of obtaining the RSSI values of all the test points again; if the RSSI values of the test points at the symmetrical positions on the two sides in the second low-frequency antenna area are equal, the position of the second low-frequency antenna does not need to be adjusted.
8. The PEPS system field strength calibration method according to claim 1, wherein after the step of calculating the threshold value of the RSSI value, the PEPS system field strength calibration method further comprises: and correcting the threshold value of the RSSI value.
9. The utility model provides a PEPS system field intensity calibration system, includes a plurality of low frequency antennas, intelligent key, automobile body controller and display, electric connection between a plurality of low frequency antennas, intelligent key, automobile body controller and the display, wherein:
the low-frequency antenna is used for sending low-frequency signals and dividing the automobile into an automobile space and an automobile space;
the intelligent key is used for receiving a low-frequency signal sent by the low-frequency antenna and a test signal sent by the automobile body controller, and is also used for calculating an RSSI value corresponding to the test point and sending an RSSI value signal of the test point;
the vehicle body controller is used for sending a test signal to the intelligent key, sending an RSSI value signal of the test point to the display and receiving the RSSI value signal of the test point sent by the intelligent key;
the display is used for receiving the RSSI value signals of the test points sent by the automobile body controller and displaying the numerical values of the RSSI value signals of the test points.
10. The PEPS system field strength calibration system of claim 9, wherein the low frequency antennas comprise a first low frequency antenna, a second low frequency antenna, and a third low frequency antenna, wherein the first low frequency antenna and the third low frequency antenna are class A antennas, and the second low frequency antenna is a class B antenna.
CN201911159820.4A 2019-11-22 2019-11-22 PEPS system field intensity calibration method and system Pending CN112838901A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114022978A (en) * 2021-10-25 2022-02-08 远峰科技股份有限公司 Calibration method, key, vehicle, system, electronic device and readable storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114022978A (en) * 2021-10-25 2022-02-08 远峰科技股份有限公司 Calibration method, key, vehicle, system, electronic device and readable storage medium

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Application publication date: 20210525