Intelligent vehicle-mounted terminal with built-in antenna

Abstract

The utility model relates to the technical field of vehicle-mounted antennas, in particular to an intelligent vehicle-mounted terminal with a built-in antenna, which comprises a power supply system connected to an automobile storage battery power supply and an automobile CAN (Controller Area Network) bus through a bus interface; the CAN acquisition circuit is used for acquiring related data in a vehicle running state; the main control circuit is used for processing related data such as embedded software and program logic; the storage circuit is used for storing the collected data; the accelerometer monitoring circuit is used for monitoring and judging whether a collision event happens to the vehicle or not; according to the utility model, the antenna is built-in and integrated on the intelligent vehicle-mounted terminal, so that from the aspect of practicability, due to the built-in and installation-free characteristics of the antenna, people do not need to worry that the antenna is sheared, equipment is damaged, and the influence of environments such as dust, vibration, rainstorm, high temperature and the like on the equipment directly; and meanwhile, the layout and routing of the antenna in the vehicle do not need to be considered, so that the installation and management difficulty is reduced and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted antennas, in particular to an intelligent vehicle-mounted terminal with a built-in antenna. Background Art

[0002] With the continuous application and development of intelligent network technology in the automotive field, cars have become smarter and provide better experience. Cars are sometimes more like running wireless communication nodes, rather than simply mechanical industrial products. Antennas are key components for realizing intelligent network functions such as radio communications, wireless networks, and satellite positioning, and they play a key role in sending and receiving signals in the communication system. As the most front-end component of the entire communication system, all location data and communication data require antennas for positioning and transmission. Therefore, the quality of the antenna directly affects the performance of the entire intelligent network vehicle system.

[0003] At present, the antennas of vehicle-mounted terminals on the market are all installed outside the equipment. Depending on the different needs of different models, they sometimes need to be customized separately. Because the signal line of this type of equipment is external, it can transmit higher frequency signals, with a larger transmission range and close to the outer range of the sky, but it consumes a lot of electricity, so it generally requires a built-in power supply. At the same time, in order to ensure accurate acquisition of communication and positioning information, the installation of the vehicle-mounted terminal antenna also needs to be considered, but the metal shell of the car body will inevitably cause certain signal interference.

[0004] In order to realize the complete intelligent network function, many antennas need to be installed, and each system has a corresponding antenna. Many manufacturers did not adopt a more optimized solution, but simply piled them side by side or scattered somewhere on the roof. This physical clustering method undoubtedly increases the area occupied by the antenna and increases the difficulty of installation and management. Utility Model Content

[0005] The utility model provides an intelligent vehicle-mounted terminal with a built-in antenna to solve the technical problem of difficult installation and management of an external vehicle-mounted antenna.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] Provided is an intelligent vehicle-mounted terminal with a built-in antenna, the vehicle-mounted terminal comprising:

[0008] A power supply system, wherein the power supply system is connected to a car battery power supply and a car CAN bus through a bus interface;

[0009] CAN acquisition circuit, used to collect relevant data under the vehicle running state;

[0010] Main control circuit, used to process embedded software and program logic and other related data;

[0011] A storage circuit, used for storing various collected data;

[0012] An accelerometer monitoring circuit is used to monitor and determine whether a collision event occurs in the vehicle;

[0013] RS232 communication circuit, used for transmitting various data stored in the automobile event data recording device to the upper computer software through the RS232 interface;

[0014] 4G communication and GPS positioning circuit, used to realize 4G network connection function and GPS & Beidou positioning function;

[0015] Built-in antenna circuit, including 4G patch antenna and GPS ceramic patch antenna;

[0016] The power input range provided by the power supply system is DC 9-36V, and a built-in backup battery is used to switch to the backup battery for power supply when the power supply circuit in the vehicle fails.

[0017] Furthermore, the power supply system comprises:

[0018] The main power supply circuit is used to convert the external input power into 5V or 3.3V power to power the internal devices;

[0019] 3.8V branch power supply circuit, used for circuit power supply;

[0020] 3.3V branch power supply circuit for powering low voltage devices; and

[0021] The backup battery management circuit is used to switch to the backup battery for power supply when the main power fails.

[0022] Furthermore, the main power circuit comprises:

[0023] DCDC chip, used to convert the input power into the required 5V or 3.3V output power;

[0024] Inductor L1 and inductor L2 are respectively connected to the input end and output end of the DCDC chip for filtering;

[0025] Capacitors C1, C2 and C3 are respectively connected to the input end, output end and feedback end of the DCDC chip to stabilize the voltage; and

[0026] LDO chip, used to stabilize voltage output.

[0027] Furthermore, the 3.8V branch power supply circuit includes:

[0028] Inductor L3 and capacitor C4 are connected to the output end of the DCDC chip for filtering and stabilizing voltage;

[0029] Diode D1 to prevent reverse current; and

[0030] Resistors R1 and R2 are used for voltage distribution and feedback control.

[0031] Furthermore, the 3.3V branch power supply circuit includes:

[0032] Inductor L4 and capacitor C5 are connected to the output end of the DCDC chip for filtering and stabilizing voltage;

[0033] Diode D2 to prevent reverse current; and

[0034] Resistors R3 and R4 are used for voltage distribution and feedback control.

[0035] Furthermore, the backup battery management circuit includes:

[0036] A backup lithium battery, which is used to supply power when the main power fails;

[0037] A power management chip, used for charge and discharge management of the backup lithium battery;

[0038] A switch tube Q1, used for switching power input; and

[0039] Capacitor C6 and capacitor C7 are used for filtering and voltage stabilization.

[0040] Furthermore, the CAN acquisition circuit includes:

[0041] CAN bus transceiver, used to receive and send CAN bus data;

[0042] CAN bus protection circuit, including a common mode inductor and an ESD diode combination, used to protect the CAN bus interface;

[0043] Resistors R5 and R6 are used for bus terminal matching; and

[0044] Capacitor C8 and capacitor C9 are used for filtering;

[0045] The main control circuit comprises:

[0046] GD32F3 MCU, used to process embedded software and program logic and other related data;

[0047] Crystal oscillator X1, used to provide clock signal;

[0048] Capacitor C10 and capacitor C11 are connected to both ends of the crystal oscillator X1 to stabilize the clock signal; and

[0049] A reset circuit, including a reset chip and a capacitor C12, is used for resetting the system;

[0050] The storage circuit comprises:

[0051] GD25Q16 chip, used to store the collected data;

[0052] Resistors R7 and R8 for voltage distribution; and

[0053] Capacitor C13 and capacitor C14 are used for filtering and voltage stabilization.

[0054] Furthermore, the accelerometer monitoring circuit comprises:

[0055] FXLS90322AES chip, used to monitor and determine whether the vehicle has a collision event, and collect the acceleration of the vehicle in operation;

[0056] Capacitor C15 and capacitor C16 for filtering and stabilizing the signal; and

[0057] Resistor R9 and resistor R10 are used for signal conditioning;

[0058] The RS232 communication circuit comprises:

[0059] TP3232N chip, used to transmit various data stored in the vehicle event data recording device through the RS232 interface;

[0060] Capacitor C17 and capacitor C18 for filtering and stabilizing the signal; and

[0061] Resistor R11 and resistor R12 are used for signal conditioning;

[0062] The 4G communication and GPS positioning circuit includes:

[0063] A7670 module, used to realize 4G network connection function and GPS Beidou positioning function;

[0064] Capacitor C19 and capacitor C20 for filtering and stabilizing the signal; and

[0065] Resistor R13 and resistor R14 are used for signal conditioning;

[0066] The built-in antenna circuit comprises:

[0067] The ceramic positioning antenna and 4G patch antenna are respectively soldered on the circuit board through the pads on the circuit board to achieve signal connection;

[0068] Capacitor C21 and capacitor C22 for filtering and stabilizing the signal; and

[0069] Resistor R15 and resistor R16 are used for signal conditioning.

[0070] The beneficial effects of the utility model are:

[0071] The utility model reduces the cost of external antennas and manual installation costs by integrating the antenna into the intelligent vehicle terminal. From the appearance point of view, the built-in antenna is simpler and more beautiful; from the practical point of view, because the antenna is built-in and installation-free, there is no need to worry about the antenna being cut, the equipment being damaged, and the impact of dust, vibration, heavy rain, high temperature and other environments on the equipment; at the same time, there is no need to consider the layout and routing of the antenna in the car, which reduces the difficulty of installation and management while saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 This is a hardware block diagram of the intelligent vehicle-mounted terminal of the utility model;

[0073] Figure 2 This is the main power circuit diagram of the utility model;

[0074] Figure 3 This is the 3.8V branch power supply circuit diagram of the utility model;

[0075] Figure 4 This is the 3.3V branch power supply circuit diagram of the utility model;

[0076] Figure 5 This is the backup battery management circuit diagram of the utility model;

[0077] Figure 6 This is the CAN acquisition circuit diagram of the utility model;

[0078] Figure 7 This is the main control circuit diagram of the utility model;

[0079] Figure 8 A storage circuit diagram of the utility model;

[0080] Fig. 9 This is the accelerometer monitoring circuit diagram of the utility model;

[0081] Fig.10 This is the RS232 communication circuit diagram of the utility model;

[0082] Fig.11 This is the 4G communication and GPS positioning circuit diagram of the utility model. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0084] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0085] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0086] The utility model provides the following preferred embodiments:

[0087] refer to Figures 1 to 11 As shown, the intelligent vehicle terminal is connected to the vehicle battery power supply and the vehicle CAN bus through the bus interface. The power bus provides power to the terminal, and the power input range accepted by the terminal is DC 9-36V. The terminal communicates data with the vehicle through the CAN bus and collects relevant data from other controllers on the vehicle bus. In addition to the vehicle status data, battery-related data, drive motor data, fault data, diagnostic data, emission data, etc. required by the remote monitoring device, it can also collect data required by the vehicle event recording device, such as vehicle speed, brake signal, accelerator pedal position, seat belt signal, vehicle unique identification code, etc.

[0088] The intelligent vehicle terminal includes a power supply system, a CAN acquisition circuit, a main control circuit, a storage circuit, an accelerometer circuit, an RS232 communication circuit, a 4G communication and positioning circuit, a built-in antenna circuit and other parts.

[0089] The main function of the power supply system is to convert the external input power into 5V or 3.3V power to power the internal devices. The power supply chip can be RICHTEK's RT7272 series DCDC chip and 3PEAK's TPL730F33 series LDO chip. At the same time, the power supply system is also equipped with a backup lithium battery. When the power supply circuit in the car cannot be powered normally due to an unexpected fault, the smart car terminal will immediately switch to the backup power supply to ensure that its functions can be used normally.

[0090] The main function of the CAN acquisition circuit is to collect relevant data under the vehicle's operating status. It is mainly composed of a CAN bus transceiver and a CAN bus protection circuit. The CAN bus transceiver can be the ATA6561 series of Microchip, and the CAN bus protection circuit can be a combination of a common mode inductor and an ESD diode.

[0091] The main function of the main control circuit is to process the embedded software and program logic and other related data. The main control microcontroller can be GigaDevice's GD32F3 series microcontroller.

[0092] The main function of the storage circuit is to store various collected data, such as real-time data reported to the monitoring platform. During network disconnection, the data can be stored first, and then sent to the monitoring platform after the network is restored. In addition, vehicle data before and after a collision can be exported later for accident analysis. The storage chip can be GigaDevice's GD25Q16 series chip.

[0093] The main function of the accelerometer monitoring circuit is to monitor and determine whether the vehicle has a collision event, and to collect the acceleration of the vehicle in operation when a collision occurs, providing an important basis for subsequent traffic accident analysis and identification. The accelerometer chip can be selected from NXP's FXLS90322AES, which is a low-power, high-performance 3-axis linear accelerometer with a nominal full-scale range of ± 15.5 g to ± 150 g, and can measure acceleration with an output data rate from 0.5Hz to 400Hz.

[0094] The main function of the RS232 communication circuit is to transmit the data stored in the vehicle event data recording device to the host computer software through the RS232 interface, so as to facilitate the viewing of the data recorded by the vehicle event data recording device at any time during the debugging process. The RS232 chip can be TP3232N from 3PEAK;

[0095] The 4G communication and GPS positioning circuit mainly realizes the 4G network connection function and the GPS & Beidou positioning function. The 4G wireless communication circuit mainly realizes the wireless communication function of the terminal. The terminal communicates wirelessly with the remote background through 4G cellular technology. The terminal can transmit the vehicle information and status collected by the terminal to the background for monitoring and data analysis. At the same time, it can also receive various commands issued by the background. According to the received commands, the terminal or vehicle can be configured and controlled. Satellite positioning adopts Beidou and GPS dual-mode, which can collect positioning data of 2 sets of satellite systems at the same time for calibration and integration. When the satellite data of one system is abnormal, the other set can also be used as a backup. The module can use the A7670 series two-in-one module of SIMCom.

[0096] The built-in patch antenna circuit mainly realizes the acquisition and transmission functions of network communication and positioning information. The ceramic positioning antenna and 4G patch antenna can be soldered on the circuit board of the vehicle terminal through the pad to achieve signal connection. The ceramic positioning antenna can use the 25*25*4mm ceramic antenna of Zhengda Xinwei, and the 4G patch antenna can also use the 41.8*10*3.2mm patch antenna of Zhengda Xinwei.

[0097] The patch antenna can be directly soldered on the circuit board through the pad on the circuit board, reducing the material and labor costs of the terminal during the wiring installation of the vehicle. The product appearance has no defects such as shrinkage, burrs, missing materials, top whitening, strain, deformation, etc. It weighs about 140g and has a protection level of IP51. The operating temperature is -30°C to 70°C, and the storage temperature is -40°C to 80°C.

[0098] The beneficial effects of the present invention are specifically embodied in that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent vehicle-mounted terminal with a built-in antenna, characterized in that: The vehicle-mounted terminal comprises: A power supply system, wherein the power supply system is connected to a car battery power supply and a car CAN bus through a bus interface; CAN acquisition circuit, used to collect relevant data under the vehicle running state; Main control circuit, used to process data related to embedded software and program logic; A storage circuit, used for storing various collected data; An accelerometer monitoring circuit is used to monitor and determine whether a collision event occurs in the vehicle; RS232 communication circuit, used to transmit various data stored in the automobile event data recording device to the host computer software through the RS232 interface; 4G communication and GPS positioning circuit, used to realize 4G network connection function and GPS & Beidou positioning function; Built-in antenna circuit, including 4G patch antenna and GPS ceramic patch antenna; The power input range provided by the power supply system is DC 9-36V, and a built-in backup battery is used to switch to the backup battery for power supply when the power supply circuit in the vehicle fails.

2. The intelligent vehicle-mounted terminal with built-in antenna according to claim 1, characterized in that: The power supply system comprises: The main power supply circuit is used to convert the external input power into 5V or 3.3V power to power the internal devices; 3.8V branch power supply circuit, used for circuit power supply; 3.3V branch power supply circuit for powering low voltage devices; and The backup battery management circuit is used to switch to the backup battery for power supply when the main power fails.

3. The intelligent vehicle-mounted terminal with built-in antenna as claimed in claim 2, characterized in that: The main power circuit comprises: DCDC chip, used to convert the input power into the required 5V or 3.3V output power; Inductor L1 and inductor L2 are respectively connected to the input end and output end of the DCDC chip for filtering; Capacitors C1, C2 and C3 are respectively connected to the input end, output end and feedback end of the DCDC chip for stabilizing the voltage; and LDO chip, used to stabilize voltage output.

4. The intelligent vehicle-mounted terminal with built-in antenna as claimed in claim 2, characterized in that: The 3.8V branch power supply circuit includes: Inductor L3 and capacitor C4 are connected to the output end of the DCDC chip for filtering and stabilizing the voltage; Diode D1 to prevent reverse current; and Resistors R1 and R2 are used for voltage distribution and feedback control.

5. The intelligent vehicle-mounted terminal with built-in antenna as claimed in claim 2, characterized in that: The 3.3V branch power supply circuit includes: Inductor L4 and capacitor C5 are connected to the output end of the DCDC chip for filtering and stabilizing the voltage; Diode D2 to prevent reverse current; and Resistors R3 and R4 are used for voltage distribution and feedback control.

6. The intelligent vehicle-mounted terminal with built-in antenna as claimed in claim 2, characterized in that: The backup battery management circuit comprises: A backup lithium battery, which is used to supply power when the main power fails; A power management chip, used for charge and discharge management of the backup lithium battery; A switch tube Q1, used for switching power input; and Capacitor C6 and capacitor C7 are used for filtering and voltage stabilization.

7. The intelligent vehicle-mounted terminal with built-in antenna according to claim 1, characterized in that: The CAN acquisition circuit comprises: CAN bus transceiver, used to receive and send CAN bus data; CAN bus protection circuit, including a common mode inductor and an ESD diode combination, used to protect the CAN bus interface; Resistors R5 and R6 are used for bus terminal matching; and Capacitor C8 and capacitor C9 are used for filtering; The main control circuit comprises: GD32F3 MCU, used to process embedded software and program logic related data; Crystal oscillator X1, used to provide clock signal; Capacitor C10 and capacitor C11 are connected to both ends of the crystal oscillator X1 to stabilize the clock signal; and A reset circuit, including a reset chip and a capacitor C12, is used for resetting the system; The storage circuit comprises: GD25Q16 chip, used to store the collected data; Resistors R7 and R8 for voltage distribution; and Capacitor C13 and capacitor C14 are used for filtering and voltage stabilization.

8. The intelligent vehicle-mounted terminal with built-in antenna according to claim 1, characterized in that: The accelerometer monitoring circuit comprises: FXLS90322AES chip, used to monitor and determine whether the vehicle has a collision event, and collect the acceleration of the vehicle in operation; Capacitor C15 and capacitor C16 for filtering and stabilizing the signal; and Resistor R9 and resistor R10 are used for signal conditioning; The RS232 communication circuit comprises: TP3232N chip, used to transmit various data stored in the vehicle event data recording device through the RS232 interface; Capacitor C17 and capacitor C18 for filtering and stabilizing the signal; and Resistor R11 and resistor R12 are used for signal conditioning; The 4G communication and GPS positioning circuit includes: A7670 module, used to realize 4G network connection function and GPS Beidou positioning function; Capacitor C19 and capacitor C20 for filtering and stabilizing the signal; and Resistor R13 and resistor R14 are used for signal conditioning; The built-in antenna circuit comprises: The ceramic positioning antenna and 4G patch antenna are respectively soldered on the circuit board through the pads on the circuit board to achieve signal connection; Capacitor C21 and capacitor C22 for filtering and stabilizing the signal; and Resistor R15 and resistor R16 are used for signal conditioning.

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