Low-frequency positioning system of PEPS key and vehicle

Abstract

The utility model discloses a low-frequency positioning system of a PEPS (Passive Entry Passive Start) key and a vehicle, and belongs to the field of automobile intellectualization. The system comprises a PEPS control unit, a plurality of antennas, a vehicle door lock and a PEPS key. The PEPS control unit sends a low-frequency wake-up signal to the plurality of antennas and drives the plurality of antennas to forward the low-frequency wake-up signal to the PEPS key at the same time; the plurality of antennas are driven to sequentially send out low-frequency field intensity signals, the PEPS key receives the low-frequency field intensity signals, detects the field intensity of the current key position and then sends the field intensity signals to the PEPS control unit through high-frequency data signals, and the PEPS control unit receives the high-frequency data signals through the antennas and then analyzes the position of the PEPS key in real time; and according to the position of the PEPS key, a control signal is sent to a vehicle door lock so as to control opening and closing of the vehicle door lock. According to the utility model, the positioning precision and the real-time performance of the PEPS key are improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive intelligence. Specifically, this utility model relates to a low-frequency positioning system for a PEPS key and a vehicle. Background Technology

[0002] The market demand for intelligent vehicles has led to keyless entry and start (PEPS) technology becoming a standard feature in automobiles. A keyless entry and start system is a wireless communication-based automotive system that allows users to enter the car, unlock the doors, and start the engine without using a physical key.

[0003] However, the implementation of the PEPS system still relies on the real-time positioning of the key. For example, the patent document with publication number CN104859585A, publication date August 26, 2015, entitled "A Key Positioning Method and System Based on PEPS Technology," discloses that: This application provides a key positioning method based on PEPS technology, which is applied to a key positioning system based on PEPS technology. The system uses an antenna to position the key. The method includes: the antenna transmitting a signal according to preset requirements; the key receiving the signal transmitted by the antenna, and determining the key's position according to the received signal and preset conditions.

[0004] However, like most existing technologies, the aforementioned publicly available documents still suffer from low key positioning accuracy. Therefore, to address this issue, this application proposes a low-frequency positioning system for PEPS keys and a vehicle. Utility Model Content

[0005] This utility model aims to overcome the shortcomings of the prior art and proposes a low-frequency positioning system and vehicle for PEPS keys to achieve the following objectives: improve the positioning accuracy and real-time performance of PEPS keys.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a low-frequency positioning system for a PEPS key, the system comprising a PEPS control unit, multiple antennas, a door lock, and a PEPS key, wherein the PEPS control unit, antennas, and door lock are all installed on the vehicle, and the PEPS control unit is connected to the multiple antennas and the door lock respectively; the multiple antennas are wirelessly connected to the PEPS key.

[0007] The PEPS control unit sends a low-frequency wake-up signal to the plurality of antennas and drives the plurality of antennas to simultaneously forward the low-frequency wake-up signal to the PEPS key, and then drives the plurality of antennas to sequentially send low-frequency field intensity signals, which are received and detected by the PEPS key to determine the current key position and sent to the PEPS control unit as high-frequency data signals, and the PEPS control unit analyzes the PEPS key position in real time after receiving the high-frequency data signals through the antenna, and sends a control signal to the door lock according to the PEPS key position to control the opening and closing of the door lock.

[0008] Preferably, the PEPS control unit comprises a controller and a timer, the timer is connected with the controller, and the controller is connected with the plurality of antennas and the door lock; the timer is used to send an enable signal to the controller at a time, and the controller is used to send a low-frequency wake-up signal to the plurality of antennas and drive the plurality of antennas to simultaneously forward the low-frequency wake-up signal to the PEPS key; the controller is also used to send a control signal to the plurality of antennas once for each received enable signal, and the plurality of antennas sequentially receive the control signal to send a low-frequency field intensity signal.

[0009] Preferably, the plurality of antennas comprises an indoor front row antenna arranged on a vehicle instrument panel, a left door antenna arranged on a left rear door panel, a right door antenna arranged on a right rear door panel, and a rear bumper antenna arranged on a rear bumper; the indoor front row antenna, the left door antenna, the right door antenna, and the rear bumper antenna are connected with the controller.

[0010] Preferably, the antenna further comprises an indoor rear row antenna arranged on a vehicle trunk and connected with the controller.

[0011] Preferably, the system comprises a vehicle welcome function switch connected with the controller; when the vehicle welcome function switch is turned on, the plurality of antennas driven by the PEPS control unit comprises the left door antenna, the right door antenna, and the rear bumper antenna.

[0012] Preferably, the system comprises a vehicle welcome projection lamp arranged on one side of the vehicle and connected with the controller; when the vehicle welcome function switch is turned on, the PEPS control unit sends a control signal to the vehicle welcome projection lamp according to the PEPS key position to control the opening and closing of the vehicle welcome projection lamp.

[0013] Preferably, the controller is a microcontroller MCU.

[0014] Meanwhile, the application also proposes a vehicle comprising the above-mentioned low-frequency positioning system of the PEPS key.

[0015] The technical advantages of this invention are as follows: The controller of this application simultaneously drives multiple antennas to transmit low-frequency wake-up signals, ensuring timely key response and guaranteeing real-time performance. After wake-up, a timer enable signal sequentially drives multiple antennas to transmit low-frequency field strength signals in a time-division manner, avoiding signal superposition interference. The antenna layout of this application covers the entire vehicle, including the front antenna of the sub-dashboard, the left and right rear door antennas, the rear bumper antenna, and the spare antenna in the trunk. The fusion of field strength data from multiple antennas significantly improves positioning accuracy. Simultaneously, the system integrates a vehicle welcome function, prioritizing the activation of the side and rear antenna groups upon activation, and combining this with the real-time key position control of the welcome projection lights to optimize the user experience. Attached Figure Description

[0016] Figure 1 A schematic diagram of a low-frequency positioning system for a PEPS key provided in this embodiment of the present invention. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The purpose is 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 this utility model, and to facilitate its implementation. To make the technical solution of this utility model clearer, it will be explained and illustrated through the following embodiments.

[0018] This embodiment discloses a low-frequency positioning system for a PEPS key, such as... Figure 1 As shown, the system includes a PEPS control unit, multiple antennas, door locks, and a PEPS key. The PEPS control unit, antennas, and door locks are all installed on the vehicle. The PEPS control unit is connected to the multiple antennas and door locks respectively; the multiple antennas are wirelessly connected to the PEPS key. The PEPS control unit and antennas are connected via twisted-pair cables.

[0019] The working principle and signal transmission relationship of the embodiment are as follows: after starting to work, the PEPS control unit sends a low-frequency wake-up signal to the plurality of antennas, and simultaneously drives the plurality of antennas to transform the low-frequency wake-up signal into an electromagnetic wave propagating in free space, which is received by the PEPS key; then, the PEPS control unit drives the plurality of antennas to send low-frequency field intensity signals in turn, which are received by the PEPS key, and then detects the field intensity of the current position of the key in the magnetic field of different antennas. The detection result is sent to the PEPS control unit through a high-frequency data signal (usually a radio frequency signal). The PEPS control unit analyzes the field intensity of each antenna radiated to the PEPS key position in real time after receiving the high-frequency data signal through the antenna, thereby analyzing the PEPS key position (the method of analyzing the key position according to the field intensity of the key in the radiation range of each antenna belongs to the prior art, and will not be described here), and sending a control signal to the door lock according to the PEPS key position to control the opening and closing of the door lock.

[0020] Specifically, the PEPS control unit of the embodiment includes a controller and a timer, the timer is connected with the controller, and the controller is connected with the plurality of antennas and the door lock respectively. The driving of each antenna by the controller can be independently controlled, that is, the plurality of antennas can be driven to work simultaneously, or only one antenna can be driven to work at the same time. In the embodiment, the controller sends a low-frequency wake-up signal to wake up the PEPS key, and during the process, the controller controls the plurality of antennas to work simultaneously, thereby expanding the antenna signal coverage range to ensure that the PEPS key is woken up in time.

[0021] The timer of the embodiment is used for sending an enabling signal to the controller at a timing. After the key is woken up, the controller drives the plurality of antennas to send low-frequency field intensity signals to the PEPS key, and during the process, the timer starts to work first after the key is woken up, and sends an enabling signal to the controller at a certain time interval. The controller sends a control signal to the antenna each time it receives an enabling signal. The plurality of antennas send low-frequency field intensity signals in turn after receiving the control signal, thereby avoiding the problem of inaccurate positioning caused by the superposition of field intensity signals sent by the plurality of antennas simultaneously. In specific implementation, the timing time is flexibly selected according to actual conditions, and in the embodiment, the timing time is set to 5 ms to ensure the real-time performance of key positioning.

[0022] The controller of the embodiment adopts a microcontroller MCU, which has high data processing efficiency, ensures the real-time performance of key positioning, has high integration and strong data processing capability, and is not prone to errors, thereby ensuring the accuracy of key positioning.

[0023] The arrangement of the low-frequency antennas on the whole vehicle needs to ensure that the low-frequency signals sent by the antennas can cover the whole vehicle. Therefore, the plurality of antennas of the embodiment includes:

[0024] The indoor front-row antenna is arranged on the vehicle auxiliary instrument panel;

[0025] The left door antenna is arranged on the left rear door panel;

[0026] The right door antenna is arranged on the right rear door panel;

[0027] The rear bumper antenna is arranged on the rear bumper; the indoor front-row antenna, the left door antenna, the right door antenna and the rear bumper antenna are connected with the controller. In addition, considering the problem of excessive length of the vehicle, the antenna further comprises an indoor rear-row antenna, which is connected with the controller and arranged on the vehicle trunk as a backup. Compared with the existing single antenna, the relative positions of multiple keys can be obtained according to the field strength of the key in the signal range of each antenna, and the positioning accuracy of the key is significantly improved through the combination of the relative positions of multiple keys.

[0028] In addition, the system of the embodiment further comprises a vehicle welcoming function switch connected with the controller, and when the vehicle welcoming function switch is turned on, the controller of the PEPS control unit drives the multiple antennas including the left door antenna, the right door antenna and the rear bumper antenna. When the user has a vehicle welcoming demand, the vehicle welcoming function switch can be turned on, and the switch can adopt a relay. In a preferred embodiment of the application, the vehicle welcoming function switch is integrated in the human-machine interaction (HMI) device of the vehicle, which facilitates user operation. In order to improve the user experience of the welcoming function, the real-time position (key position) of the user needs to be obtained, which requires more real-time and accurate positioning of the PEPS key. When the vehicle is welcoming, the guest usually enters the rear row of the vehicle from the side rear of the vehicle and then sits down, so when the vehicle welcoming function switch is turned on, the participation of the left door antenna, the right door antenna and the rear bumper antenna can perfectly cover the area behind the side of the vehicle, ensuring the positioning accuracy requirement; at the same time, compared with the indoor front-row antenna, the antenna signal propagation path is also shorter, ensuring the real-time requirement.

[0029] In order to further improve the user experience of the welcoming function, the system of the embodiment further comprises a vehicle welcoming projection lamp arranged on one side of the vehicle and connected with the controller; when the vehicle welcoming function switch is turned on, the controller of the PEPS control unit sends a control signal to the vehicle welcoming projection lamp according to the PEPS key position to control the on-off of the vehicle welcoming projection lamp. In the embodiment, when the distance between the PEPS key position and the vehicle is lower than a preset distance threshold, the vehicle welcoming projection lamp is turned on, and the preset distance threshold can be flexibly selected according to actual conditions.

[0030] Meanwhile, the embodiment further provides a vehicle comprising the above-mentioned low-frequency positioning system of the PEPS key.

[0031] The utility model has been described above in conjunction with the drawings. Obviously, the utility model is not limited by the above-mentioned mode in its specific implementation. As long as various non-essential improvements are made using the method concept and technical solution of the utility model; or without improvement, the above-mentioned concept and technical solution of the utility model are directly applied to other occasions, which are within the protection scope of the utility model.

Claims

1. A low frequency location system for a PEPS key, characterized in that: The system comprises a PEPS control unit, a plurality of antennas, a door lock, and a PEPS key, wherein the PEPS control unit, the antennas, and the door lock are arranged on a vehicle, the PEPS control unit is connected with the plurality of antennas and the door lock respectively; and the plurality of antennas are in wireless communication with the PEPS key.

2. The low frequency positioning system of a PEPS key according to claim 1, characterized in that: The PEPS control unit comprises a controller and a timer, the timer is connected with the controller, the controller is connected with the plurality of antennas and the door lock respectively; the timer is used to send an enabling signal to the controller at a time, the controller is used to send a low-frequency wake-up signal to the plurality of antennas and drive the plurality of antennas to forward the low-frequency wake-up signal to the PEPS key at the same time; and the controller is also used to send a control signal to the plurality of antennas once for each received enabling signal, and the plurality of antennas send low-frequency field intensity signals in turn after receiving the control signals in turn.

3. A low frequency locating system for a PEPS key according to claim 2, characterized in that: The plurality of antennas comprise: an indoor front-row antenna arranged on a vehicle dashboard; a left door antenna arranged on a left rear door panel; a right door antenna arranged on a right rear door panel; a rear bumper antenna arranged on a rear bumper; the indoor front-row antenna, the left door antenna, the right door antenna, and the rear bumper antenna are connected with the controller.

4. A low frequency locating system for a PEPS key as claimed in claim 3, characterized in that: The antennas further comprise an indoor rear-row antenna arranged on a vehicle trunk, and the indoor rear-row antenna is connected with the controller.

5. The low frequency locating system of a PEPS key according to claim 3, characterized in that: The system comprises a vehicle welcome function switch, the vehicle welcome function switch is connected with the controller, and when the vehicle welcome function switch is turned on, the plurality of antennas driven by the PEPS control unit comprise the left door antenna, the right door antenna, and the rear bumper antenna.

6. A low frequency locating system for a PEPS key according to claim 5, characterized in that: The system comprises a vehicle welcome projection lamp arranged on one side of the vehicle and connected with the controller; and when the vehicle welcome function switch is turned on, the PEPS control unit sends a control signal to the vehicle welcome projection lamp to control the vehicle welcome projection lamp switch according to the position of the PEPS key.

7. A low frequency locating system for a PEPS key according to any one of claims 2-6, characterized in that: The controller adopts a microcontroller MCU.

8. The low frequency locating system of a PEPS key according to claim 1, characterized in that: After the PEPS control unit sends a low-frequency wake-up signal to the plurality of antennas and drives the plurality of antennas to forward the low-frequency wake-up signal to the PEPS key at the same time, the plurality of antennas send low-frequency field intensity signals in turn, and the PEPS key receives and detects the field intensity of the current key position and sends a high-frequency data signal to the PEPS control unit; the PEPS control unit analyzes the position of the PEPS key in real time after receiving the high-frequency data signal through the antenna, and sends a control signal to the door lock to control the door lock switch according to the position of the PEPS key.

9. A vehicle characterized by: The vehicle comprises the low-frequency positioning system of the PEPS key according to any one of claims 1-8.

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