Radio frequency detection equipment and method for intelligent key

Abstract

The invention discloses a radio frequency detection device of an intelligent key, the device is provided with a control unit, the control unit is provided with an LF transmitting end and an RF receiving end, the LF transmitting end sends an LF signal to the detected intelligent key through an antenna, the RF receiving end is used for receiving an RF signal sent by the detected intelligent key, and the RF receiving end is used for receiving the RF signal sent by the detected intelligent key. The signal output end of the control unit is connected with the detection indicating lamp and used for prompting the information receiving condition of the RF receiving end. Whether the radio frequency function of the intelligent key is normal or not is represented through the LED indicator lamp, the radio frequency function of the intelligent key can be conveniently detected, the after-sales maintenance cost is reduced, and meanwhile portable detection equipment of the intelligent key is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of radio frequency detection of intelligent keys. Background Art

[0002] The market demand for intelligent cars, along with keyless entry and start system technology has become a standard feature of cars. At the same time, based on the traditional keyless entry and start, further active entry functions are proposed: welcome light, approach unlocking, away from locking, etc. These functions are completely dependent on the real-time positioning of the smart key, which requires the reliability of the radio frequency function of the smart key and reliable detection equipment to determine whether the smart key is normal.

[0003] At present, there are also relevant detection equipment for existing smart keys, such as the public document with publication number CN108287280A, publication date July 17, 2018, and patent name "A Vehicle Key Detection System", which discloses a vehicle key detection system including: a key trigger device for triggering the function key of the vehicle key; a photosensitive detection device for detecting the luminous brightness of the vehicle key; a radio frequency detection device for detecting the radio frequency signal of the vehicle key; a station flow device for controlling the vehicle key to flow to the detection station corresponding to the key trigger device, and controlling the vehicle key that has completed the detection to be moved out of the detection station; and a control device for controlling the key trigger device to trigger the function key of the vehicle key, controlling the action of the station flow device to control the vehicle key to move into and out of the detection station, receiving the luminous brightness and the radio frequency signal, and analyzing and processing the luminous brightness and the radio frequency signal.

[0004] However, similar equipment is not convenient enough in measurement and it is difficult to simultaneously meet the requirements of simple structure, method of use, and accurate and reliable testing performance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to realize a radio frequency detection device for a smart key which has a simple structure and reliable operation and satisfies the requirements of accurate and efficient testing.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a radio frequency detection device for a smart key, the device is provided with a control unit, the control unit is provided with an LF transmitter and an RF receiver, the LF transmitter sends an LF signal to the smart key being detected through an antenna, the RF receiver is used to receive the RF signal sent by the smart key being detected, and the signal output end of the control unit is connected to a detection indicator light for indicating the reception information status of the RF receiver.

[0007] The detection indicator lights are provided with six, namely:

[0008] LED1 is the low-frequency detection normal indicator light;

[0009] LED2 is the low-frequency detection fault indicator;

[0010] LED3 is the high-frequency locking button detection indicator light;

[0011] LED4 is the high-frequency unlock button detection indicator light;

[0012] LED5 is the high-frequency start button detection indicator light;

[0013] LED is the high-frequency trunk button detection indicator light.

[0014] The antenna includes three low-frequency antennas, and the angles between the three antennas are all 90 degrees. The smart key to be detected is placed in the space built by the three antennas, and the low-frequency data sent by the antenna unit is detected, and the detected data is fed back through radio frequency.

[0015] The detected smart key completes the detection of the electromagnetic field signal radiated by the antenna, and feeds back the detected signal through radio frequency. The control unit communicates with the smart key through I MMO and reads the preset wake-up data. After receiving the wake-up data, the smart key starts to detect the low-frequency field strength.

[0016] The detected smart key body is integrated with a switch button, and a key corresponding command signal is sent out by pressing the switch button. The command signal communicates with the control unit using a high-frequency protocol.

[0017] The control unit is provided with an INPUT1 input interface, and the signal output end of the control unit is connected to a working status indicator light.

[0018] A radio frequency detection method for a smart key, when a control unit receives a valid I NPUT1 input, drives the LF transmitting circuit to respectively make the antenna send data and field strength value, then the detected smart key is sent to a decoding board in the control unit through an RF signal, the decoding board compares the received data with an internally set threshold value, determines whether it is qualified and uses a detection indicator light to display the test result.

[0019] The X-axis antenna sends data and carrier, the smart key being tested is measured and returns the test results, the decoding board receives the original information of the field strength returned by the test, and converts the received original information into the actual field strength X-RSS I_x, X-RSS I_y, X-RSS I_z, and then compares and tests the three field strength values ​​of X-RSS I_x, X-RSS I_y, and X-RSS I_z. If X-RSS I_x is greater than X-RSS I_y, X-RSS I_z, it is qualified, otherwise it is considered unqualified;

[0020] The Y-axis antenna sends data and carrier, the smart key being tested is measured and returns the test results, the decoding board receives the original information of the field strength returned, and converts the received original information into the actual field strength Y-RSS I_x, Y-RSS I_y, Y-RSS I_z, and then compares and tests the three field strength values ​​of Y-RSS I_x, Y-RSS I_y, and Y-RSS I_z. If Y-RSS I_y is greater than Y-RSS I_x, Y-RSS I_z, it is qualified, otherwise it is considered unqualified;

[0021] The Z-axis antenna sends data and carrier, the smart key being tested is measured and returns the test results, the decoding board receives the original field strength information returned by the test, and converts the received original information into actual field strength Z-RSS I_x, Z-RSS I_y, and Z-RSS I_z, and then compares and tests the three field strength values ​​of Z-RSS I_x, Z-RSS I_y, and Z-RSS I_z. If Z-RSS I_z is greater than Z-RSS I_x and Z-RSS I_y, it is qualified, otherwise it is considered unqualified.

[0022] The indicator light is:

[0023] When receiving the remote locking button signal, LED3 will light up. If it continues to be received, it will continue to light up. If it is not received, LED3 will be turned off.

[0024] When receiving the remote control unlock button signal, LED4 lights up. If it continues to be received, it will continue to light up. If it is not received, LED4 will be turned off.

[0025] When receiving the remote control start button signal, LED5 will light up. If it continues to be received, it will continue to light up. If it is not received, LED5 will be turned off.

[0026] When receiving the remote trunk button signal, LED6 will light up. If it continues to be received, it will continue to light up. If it is not received, LED6 will be turned off.

[0027] The present invention uses an LED indicator light to indicate whether the radio frequency function of the smart key is normal, which facilitates the detection of the radio frequency function of the smart key, reduces the cost of after-sales maintenance, and promotes portable detection equipment for the smart key. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following is a brief description of the contents expressed in each figure in the specification of the present invention:

[0029] Figure 1 This is a structural diagram of the radio frequency detection system of the smart key. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the specific implementation methods of the present invention, such as the shape, structure, relative position and connection relationship between the various components involved, the function and working principle of each part, the manufacturing process and operation method, etc., through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0031] The radio frequency detection device of the smart key includes: a transmitting feedback unit: a smart key, a low-frequency signal detection unit and a radio frequency transmitting unit, which receives electromagnetic waves radiated by a low-frequency antenna and radiates them into free space through radio frequency signals, or actively transmits radio frequency signals by pressing a key button. The interior generally contains a high-frequency transmitting circuit and a low-frequency detection circuit (3D antenna).

[0032] Control unit: low-frequency drive / high-frequency receiving module, which controls the low-frequency antenna to work and receive the key feedback or actively transmitted RF signals according to the defined RF protocol, and determines the field strength in the three-axis direction of the smart key feedback in combination with a specific algorithm. It generally contains a low-frequency drive circuit and a RF receiving circuit;

[0033] Antenna unit: low-frequency antenna, low-frequency signal radiation medium, that is, coil winding, converts the low-frequency signal transmitted on the control line of the control unit into an electromagnetic wave propagating in free space. The control unit and the antenna unit are connected by a twisted pair cable, and the antenna unit is placed in the three-axis directions of X-axis, Y-axis and Z-axis.

[0034] Display unit: The control unit lights up the LED to indicate whether the radio frequency of the smart key is normal.

[0035] In this system solution, all algorithms are completely implemented by the control unit. The smart key detects the field strength radiated by the low-frequency antenna, and the standardization of the smart key is easy to achieve. The control unit first drives multiple low-frequency antennas at the same time to wake up the smart key according to the defined protocol, and then drives the three-axis low-frequency antennas of the X-axis, Y-axis, and Z-axis one by one according to the defined current and the defined order; after the smart key detects the wake-up signal, it starts to detect the field strength (RSS I) radiated to that place by each low-frequency antenna. After all the field strength detections are completed, they are transmitted to free space through radio frequency (433MHz) signals; after the control unit receives the radio frequency signal fed back by the smart key, it determines whether the smart key is normal based on the comparison of the field strength detected by each antenna.

[0036] Drive the low-frequency antenna to send low-frequency signals and receive RF feedback from the smart key; Antenna unit: used to transmit the low-frequency data sent by the control unit. The three low-frequency antennas are fixed in the three-axis directions of X, Y, and Z. The smart key is placed in the middle of the three-axis antenna to detect the low-frequency data sent by the antenna unit and feedback the detected data through RF.

[0037] The control unit is powered by the built-in switching power supply of the device. The control unit contains power supply circuit, low-frequency drive circuit, RF receiving circuit, etc. The MCU drives the antenna unit to work through the low-frequency drive circuit; the MCU receives the RF data fed back by the smart key through the RF receiving circuit, and determines whether the low-frequency reception of the smart key is normal based on the received data;

[0038] The antenna unit receives the low-frequency signal transmitted by the control unit, converts it into an electromagnetic field signal and radiates it into the space environment around the antenna.

[0039] The smart key detects the electromagnetic field signal radiated by the antenna unit and feeds back the detected signal through radio frequency. At the same time, the switch button is integrated on the body, which can be actively pressed to unlock, lock or unlock the trunk, start with one button, etc.

[0040] The control unit and the smart key communicate according to a specific high-frequency protocol; different key values ​​correspond to different functions (lock, unlock, one-touch start, trunk). The layout of the low-frequency antenna on the device must be consistent with the direction of the 3D antenna of the smart key. The general layout requires that the XYZ three-axis directions of the smart key 3D antenna are placed parallel to the three XYZ-arranged low-frequency antennas. The control unit and the smart key communicate according to a specific low-frequency protocol; the control unit communicates with the smart key through I MMO and reads specific wake-up data. The smart key starts to detect the low-frequency field strength only after receiving the wake-up data.

[0041] The control unit can independently control the drive of each antenna, that is, it can drive multiple antennas to work at the same time, or it can drive only one antenna to work at the same time. The field strength is directional, and the field strength of multiple antennas at the same place will overlap, resulting in inaccurate feedback. When detecting low frequency, press X, Y, and Z to drive a single antenna for detection.

[0042] The low-frequency function of the smart key is judged by driving the X, Y, and Z axes in a defined order, and the strength of the RF signal feedback from the smart key is also fed back in a defined order. The control unit comprehensively judges whether the low-frequency function of the smart key is normal based on the detected field strength value and the defined order. The driving current of the antenna can be set independently, and the appropriate current is set to ensure the stability of the smart key detection.

[0043] Control unit interface function definition:

[0044] Power supply, ground, X-axis antenna, Y-axis antenna, Z-axis antenna;

[0045] I NPUT1- low frequency detection input, low effective, touch switch;

[0046] LED1- low frequency detection normal indicator light output;

[0047] LED2- low frequency detection fault indicator light output;

[0048] LED3-high frequency lock button detection indicator light output;

[0049] LED4-high frequency unlock button detection indicator light output;

[0050] LED5-high frequency start button detection indicator light output;

[0051] LED6-high frequency trunk button detection indicator light output;

[0052] like Figure 1 As shown, when the INPUT1 input is valid, the LF transmitting circuit is driven to send data and field strength values ​​to the X-axis antenna, Y-axis antenna and Z-axis antenna respectively. The key to be tested will be sent to the decoding board through the RF signal. The decoding board compares the data of the X-axis, Y-axis and Z-axis with the internal set threshold (the accuracy error of the components requires updating the internal set threshold)

[0053] When I NPUT1 input is valid, LED1 and LED2 outputs are turned off;

[0054] The X-axis is connected to the rear antenna in the room, and the X-axis antenna sends data and carrier waves. The key will measure and return the test results. The decoder board receives the original field strength information of the return test and keeps a record. Then, the decoder board converts the received original information into the actual field strength X-RSS I_x, X-RSS I_y, and X-RSS I_z, and keeps a record. Among them, the three field strength values ​​of X-RSS I_x, X-RSS I_y, and X-RSS I_z must be compared and tested and controlled. Because this is a test to drive the X-axis antenna, X-RSS I_x should be greater than X-RSS I_y and X-RSS I_z. Comparing these three values, if X-RSS I_x is the largest, it is qualified, otherwise it is considered unqualified.

[0055] The Y-axis is connected to the front antenna in the room, and the Y-axis antenna sends data and carrier waves. The key will measure and return the test results. The decoder board receives the original field strength information returned by the test and keeps a record. Then, the decoder board converts the received original information into the actual field strength Y-RSS I_x, Y-RSS I_y, and Y-RSS I_z, and keeps a record. Among them, the three field strength values ​​of Y-RSS I_x, Y-RSS I_y, and Y-RSS I_z must be compared and tested and controlled. Because this is a test to drive the Y-axis antenna, Y-RSS I_y should be greater than Y-RSS I_x and Y-RSS I_z. Comparing these three values, if Y-RSS I_y is the largest, it is qualified, otherwise it is considered unqualified.

[0056] The Z-axis is connected to the rear bumper antenna, and the Z-axis antenna sends data and carrier waves. The key will measure and return the test results. The decoder board receives the original field strength information returned by the test and keeps a record. Then, the decoder board converts the received original information into the actual field strength Z-RSS I_x, Z-RSS I_y, and Z-RSS I_z, and keeps a record. Among them, the three field strength values ​​of Z-RSS I_x, Z-RSS I_y, and Z-RSS I_z must be compared and tested and controlled. Because this is a test performed by driving the Z-axis antenna, Z-RSS I_z should be greater than Z-RSS I_x and Z-RSS I_y. Comparing these three values, if Z-RSS I_z is the largest, it is qualified, otherwise it is considered unqualified.

[0057] If the above X-axis, Y-axis, and Z-axis data are all qualified, LED1 will be lit;

[0058] If any of the above X-axis, Y-axis, and Z-axis data is unqualified, LED2 will be lit;

[0059] When receiving the remote locking button signal, LED3 will light up. If it continues to be received, it will continue to light up. If it is not received, LED3 will be turned off.

[0060] When receiving the remote control unlock button signal, LED4 lights up. If it continues to be received, it will continue to light up. If it is not received, LED4 will be turned off.

[0061] When receiving the remote control start button signal, LED5 will light up. If it continues to be received, it will continue to light up. If it is not received, LED5 will be turned off.

[0062] When receiving the remote trunk button signal, LED6 will light up. If it continues to be received, it will continue to light up. If it is not received, LED6 will be turned off.

[0063] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A radio frequency detection device for a smart key, characterized in that: The device is provided with a control unit, which is provided with an LF transmitter and an RF receiver. The LF transmitter sends an LF signal to the detected smart key through an antenna, and the RF receiver is used to receive the RF signal sent by the detected smart key. The signal output end of the control unit is connected to a detection indicator light to prompt the reception information status of the RF receiver.

2. The radio frequency detection device for the smart key according to claim 1, characterized in that: The detection indicator lights are provided with six, namely: LED1 is the low-frequency detection normal indicator light; LED2 is the low-frequency detection fault indicator light; LED3 is the high-frequency lock button detection indicator light; LED4 is the high-frequency unlock button detection indicator light; LED5 is the high-frequency start button detection indicator light; LED is the high-frequency trunk button detection indicator light.

3. The radio frequency detection device for the smart key according to claim 1 or 2, characterized in that: The antenna includes three low-frequency antennas, and the angles between the three antennas are all 90 degrees. The smart key to be detected is placed in the space built by the three antennas, and the low-frequency data sent by the antenna unit is detected, and the detected data is fed back through radio frequency.

4. The radio frequency detection device for the smart key according to claim 3, characterized in that: The detected smart key completes the detection of the electromagnetic field signal radiated by the antenna, and feeds back the detected signal through radio frequency. The control unit communicates with the smart key through IMMO and reads the preset wake-up data. After receiving the wake-up data, the smart key starts to detect the low-frequency field strength.

5. The radio frequency detection device for the smart key according to claim 4, characterized in that: The detected smart key body is integrated with a switch button, and a key corresponding command signal is sent out by pressing the switch button. The command signal communicates with the control unit using a high-frequency protocol.

6. The radio frequency detection device for a smart key according to claim 1 or 5, characterized in that: The control unit is provided with an INPUT1 input interface, and the signal output end of the control unit is connected to a working status indicator light.

7. A radio frequency detection method for a smart key, characterized in that: When the control unit receives a valid input from INPUT1, it drives the LF transmitting circuit to let the antenna send data and field strength value respectively. Then the smart key being tested is sent to the decoding board in the control unit through the RF signal. The decoding board compares the received data with the internal set threshold to determine whether it is qualified and uses the detection indicator light to display the test result.

8. The radio frequency detection method of the smart key according to claim 7, characterized in that: The X-axis antenna sends data and carrier, the smart key being tested is measured and returns the test results, the decoding board receives the original information of the field strength returned, and converts the received original information into the actual field strength X-RSSI_x, X-RSSI_y, and X-RSSI_z, and then compares and tests the three field strength values ​​of X-RSSI_x, X-RSSI_y, and X-RSSI_z. If X-RSSI_x is greater than X-RSSI_y and X-RSSI_z, it is qualified, otherwise it is considered unqualified; The Y-axis antenna sends data and carrier, the smart key being tested is measured and returns the test results, the decoding board receives the original information of the field strength returned, and converts the received original information into the actual field strength Y-RSSI_x, Y-RSSI_y, Y-RSSI_z, and then compares and tests the three field strength values ​​of Y-RSSI_x, Y-RSSI_y, and Y-RSSI_z. If Y-RSSI_y is greater than Y-RSSI_x, Y-RSSI_z, it is qualified, otherwise it is considered unqualified; The Z-axis antenna sends data and carrier, the detected smart key performs measurement and returns the test results, and the decoding board receives the original field strength information of the returned test. The decoding board converts the received original information into the actual field strength Z-RSSI_x, Z-RSSI_y, and Z-RSSI_z, and then compares and tests the three field strength values ​​of Z-RSSI_x, Z-RSSI_y, and Z-RSSI_z. If Z-RSSI_z is greater than Z-RSSI_x and Z-RSSI_y, it is qualified, otherwise it is considered unqualified.

9. The radio frequency detection method of the smart key according to claim 8, characterized in that: The indicator light is: When receiving the remote locking button signal, LED3 will be lit. If it is continuously received, it will be continuously lit. If it is not received, LED3 will be turned off. When receiving the remote control unlock button signal, LED4 lights up. If it continues to be received, it will continue to light up. If it is not received, LED4 will be turned off. When receiving the remote control start button signal, LED5 will light up. If it continues to be received, it will continue to light up. If it is not received, LED5 will be turned off. When receiving the remote trunk button signal, LED6 will light up. If it continues to be received, it will continue to light up. If it is not received, LED6 will be turned off.

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