A new OBD terminal for vehicle networking
By integrating a voltage detection module and an IMU wake-up module into the vehicle networking OBD terminal, the problems of inaccurate vehicle power supply status identification and poor communication interface compatibility are solved, realizing intelligent start-stop control with low power consumption and real-time response, which is suitable for OBD diagnosis of multiple vehicle models.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YIKEDA TECH DEV CO LTD
- Filing Date
- 2025-10-31
- Publication Date
- 2026-07-24
AI Technical Summary
Existing vehicle diagnostic and condition monitoring equipment suffers from problems such as simple detection circuit design that fails to accurately identify ignition or power supply status, poor compatibility of K-Line communication interfaces, and lack of effective low-power wake-up mechanisms, resulting in high energy consumption and system instability.
It adopts an MCU, a wake-up module, a 4G module, a USB module, an audio amplifier, a GNSS positioning module, an RF switching SPDT, a SIM card module, a voltage detection module, LED lights, and a CAN module. The voltage detection module is connected to the MCU, and the vehicle's ignition status or power supply status is detected through a voltage comparison unit. The NPN transistor driver circuit is used to adapt the K-line level, and the IMU wake-up module is combined to achieve low-power standby and intelligent wake-up.
It achieves accurate identification of vehicle power supply status, improves the compatibility of K-Line interface, reduces device standby power consumption, ensures system real-time performance and stability, and is suitable for OBD diagnostic scenarios of multiple vehicle models.
Smart Images
Figure CN224553689U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of vehicle electronic technology, and in particular relates to a new type of vehicle networking OBD terminal for aftermarket installation. Background Technology
[0002] Existing vehicle diagnostic and condition monitoring equipment typically communicates with the vehicle's electronic control unit (ECU) via an OBD interface to collect vehicle operating parameters and read diagnostic information.
[0003] However, existing equipment generally suffers from the following problems:
[0004] First, the detection circuit design is simple and cannot accurately identify the ignition or power supply status, causing the equipment to continue working after the vehicle is turned off, resulting in excessive energy consumption.
[0005] Secondly, the K-Line communication interface has poor compatibility and cannot effectively adapt to the K-line level of different car models.
[0006] Third, most devices lack an effective low-power wake-up mechanism and cannot automatically wake up the system based on the vehicle's movement status, thus affecting the system's real-time performance and stability. Utility Model Content
[0007] The purpose of this invention is to provide a new type of vehicle networking OBD terminal for aftermarket installations, which solves the technical problems of difficult accurate identification of vehicle power supply status, poor communication interface compatibility, and slow device wake-up response.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A new type of vehicle networking OBD terminal for aftermarket installation includes an MCU, a wake-up module, a 4G module, a USB module, an audio amplifier, a speaker, a GNSS positioning module, an RF switching SPDT, a SIM card module, a voltage detection module, LED lights, a CAN module, and a power supply module.
[0010] The voltage detection module, LED lights, CAN module, 4G module, and wake-up module are all connected to the MCU.
[0011] The USB module, audio amplifier, GNSS positioning module, and SIM card module are all connected to the 4G module.
[0012] The radio frequency switching SPDT is connected to the GNSS positioning module, and the radio frequency switching SPDT is also connected to the AIN1 antenna and the AIN2 antenna respectively.
[0013] The speaker is connected to the audio amplifier; the voltage detection module is connected to the K-Line single-wire communication interface, and the CAN module is connected to the CAN bus interface.
[0014] The power supply module provides power to the MCU, wake-up module, 4G module, USB module, audio amplifier, speaker, GNSS positioning module, RF switching SPDT, SIM card module, voltage detection module, LED lights and CAN module.
[0015] Preferably, the voltage detection module includes a voltage comparison unit, which is connected to a K-Line single-wire communication interface. The K-Line single-wire communication interface is connected to the voltage level VIN of the K-line output by the vehicle's OBD system, and is used to detect the vehicle's ignition status or power supply status, and to feed the comparison result back to the MCU.
[0016] Preferably, the K-Line single-wire communication interface uses an NPN transistor driver circuit to adapt to the VIN level of the K-line of the vehicle's OBD system, thereby enabling communication with the vehicle's OBD system.
[0017] Preferably, the MCU is model AT32F415KBU7-4; the 4G module is model EC200U; the GNSS positioning module is model ATGM336H; the RF switching SPDT is model HMC8038LP4CETR; the CAN module is model TJA1044T; the wake-up module is model LSM6DS3; the voltage detection module is model LM2903; the audio amplifier is model MAX98357A; and the USB module is model CH340E.
[0018] Preferably, the NPN transistor driving circuit specifically includes diode D25, resistor R27, capacitor C36, resistor R34, capacitor C102, transistor Q27, resistor R532, and capacitor C103.
[0019] The positive terminal of diode D25 is connected to the K-line, and the negative terminal is connected to the base of transistor Q27 through resistor R27. The negative terminal of diode D25 is also connected to ground through capacitor C36. The connection point between resistor R27 and the base of transistor Q27 is connected to ground through resistor R34. The emitter of transistor Q27 is connected to ground, and the collector is connected to the positive power supply through resistor R532. One end of capacitor C102 is connected to the base of transistor Q27, and the other end is connected to ground. The collector of transistor Q27 is connected to ground through capacitor C103.
[0020] The collector of transistor Q27 is connected to the voltage detection module.
[0021] Preferably, the power module includes a TVS protection module, a DC-DC module, a battery management chip, a battery pack, a GNSS power module, an MCU power module, and an SPDT power module. The input terminal of the DC-DC module is connected to an external power supply through the TVS protection module, and the output terminal outputs 4.8V power.
[0022] The battery management chip's input is connected to a 4.8V power supply, and its outputs power the GNSS power module, MCU power module, and SPDT power module, respectively.
[0023] The battery pack is connected to a battery management chip, and the GNSS power module, MCU power module, and SPDT power module are all powered by 3.3V regulators.
[0024] The GNSS power module supplies power to the SIM card module, GNSS positioning module, 4G module, USB module, audio amplifier, and speaker.
[0025] The SPDT power module supplies power to the RF switching SPDT;
[0026] The MCU power module supplies power to the MCU, wake-up module, voltage detection module, LEDs, and CAN module.
[0027] Preferably, the DC-DC module is model SCT2630; the TVS protection module is model SMBJ58A TVS tube; the battery management chip is model TP4056; and the GNSS power module, MCU power module and SPDT power module are all model ME6212C33M5G.
[0028] This invention discloses a novel vehicle networking OBD terminal for aftermarket installations, which solves the technical problems of inaccurate identification of vehicle power supply status, poor communication interface compatibility, and sluggish device wake-up response. This invention can detect the vehicle power supply status in real time, realize intelligent start-stop control, effectively reduce standby power consumption, has K-Line interface level adaptive function, strong communication compatibility, and IMU wake-up mechanism, which can accurately determine the vehicle's motion status and ensure that the communication module starts as needed. The overall system structure is compact and highly reliable, and it is suitable for OBD diagnostic scenarios of multiple vehicle models. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the present invention.
[0030] Figure 2 This is a block diagram of the power supply module of this utility model.
[0031] Figure 3 This is a circuit diagram of the GNSS positioning module of this utility model;
[0032] Figure 4 This is the circuit diagram of the radio frequency switching SPDT of this utility model;
[0033] Figure 5 This is a circuit diagram of the K-Line single-wire communication interface of this utility model. Detailed Implementation
[0034] Depend on Figures 1-5 The novel vehicle networking OBD terminal shown includes an MCU, a wake-up module, a 4G module, a USB module, an audio amplifier, a speaker, a GNSS positioning module, an RF switching switch SPDT, a SIM card module, a voltage detection module, an LED light, a CAN module, and a power supply module.
[0035] The voltage detection module, LED lights, CAN module, 4G module, and wake-up module are all connected to the MCU.
[0036] The voltage detection module includes a voltage comparison unit, which is connected to a K-Line single-wire communication interface. The K-Line single-wire communication interface is connected to the level VIN of the K-line output by the vehicle's OBD system, and is used to detect the vehicle's ignition status or power supply status, and feed the comparison result back to the MCU.
[0037] The USB module, audio amplifier, GNSS positioning module, and SIM card module are all connected to the 4G module.
[0038] The radio frequency switching SPDT is connected to the GNSS positioning module, and the radio frequency switching SPDT is also connected to the AIN1 antenna and the AIN2 antenna respectively.
[0039] In this embodiment, the radio frequency switching switch SPDT is connected to the GNSS positioning module, and also to the AIN1 antenna and AIN2 antenna respectively, for switching radio frequency signals of different frequency bands to improve GNSS positioning and communication quality; the speaker is connected to the audio amplifier to realize the sound output function; the CAN module is connected to the vehicle CAN bus interface to realize data communication with the vehicle ECU.
[0040] like Figure 4 The diagram shows the specific circuit diagram of the RF switching SPDT. Chip U12 and its peripheral circuitry constitute the RF switching SPDT (single-pole double-throw). J5 and J7 are connected to antennas AIN1 and AIN2 respectively, which can be external and internal antennas, respectively.
[0041] Chip U10 is the GNSS positioning module. The RFC pin of chip U12 is connected to the RF_IN pin of chip U10. Chip U10 is connected to the MCU via a serial port.
[0042] The speaker is connected to the audio amplifier; the voltage detection module is connected to the K-Line single-wire communication interface, and the CAN module is connected to the CAN bus interface.
[0043] The K-Line single-wire communication interface uses an NPN transistor driver circuit to adapt to the voltage level VIN of the K-line of the vehicle's OBD system, thereby enabling communication with the vehicle's OBD system.
[0044] The NPN transistor drive circuit specifically includes diode D25, resistor R27, capacitor C36, resistor R34, capacitor C102, transistor Q27, resistor R532, and capacitor C103.
[0045] The positive terminal of diode D25 is connected to the K-line, and the negative terminal is connected to the base of transistor Q27 through resistor R27. The negative terminal of diode D25 is also connected to ground through capacitor C36. The connection point between resistor R27 and the base of transistor Q27 is connected to ground through resistor R34. The emitter of transistor Q27 is connected to ground, and the collector is connected to the positive power supply through resistor R532. One end of capacitor C102 is connected to the base of transistor Q27, and the other end is connected to ground. The collector of transistor Q27 is connected to ground through capacitor C103.
[0046] The collector of transistor Q27 is connected to the voltage detection module.
[0047] In this embodiment, the K-Line single-wire communication interface is connected to the vehicle's OBD system output K-line VIN, which is used to detect the vehicle's ignition status or power supply status.
[0048] During use, when the vehicle is ignited or the power supply voltage reaches the set threshold, the voltage comparison unit outputs a high-level signal to the MCU, enabling the MCU and related modules to enter the working state; when the voltage is lower than the threshold, it outputs a low level, and the MCU and related modules enter a low-power standby state, thereby realizing intelligent power-on and energy-saving control.
[0049] In this embodiment, the positive terminal of diode D25 is connected to the K-Line signal, and the negative terminal is connected to the base of transistor Q27 through resistor R27. Simultaneously, capacitor C36 filters out high-frequency interference and grounds the diode. The base node is connected to ground through resistor R34 to suppress electrostatic interference. The emitter of transistor Q27 is grounded, and the collector is connected to the positive power supply through resistor R532. Capacitor C103 further filters the collector. Capacitor C102 is connected in parallel between the base and ground to delay and suppress voltage spikes. This drive circuit realizes the level conversion and amplification of the K-Line signal, enabling the MCU to stably read OBD communication data.
[0050] The power supply module provides power to the MCU, wake-up module, 4G module, USB module, audio amplifier, speaker, GNSS positioning module, RF switching SPDT, SIM card module, voltage detection module, LED lights and CAN module.
[0051] The power module includes a TVS protection module, a DC-DC module, a battery management chip, a battery pack, a GNSS power module, an MCU power module, and an SPDT power module. The input terminal of the DC-DC module is connected to an external power supply through the TVS protection module, and the output terminal outputs 4.8V power.
[0052] The battery management chip's input is connected to a 4.8V power supply, and its outputs power the GNSS power module, MCU power module, and SPDT power module, respectively.
[0053] The battery pack is connected to a battery management chip, and the GNSS power module, MCU power module, and SPDT power module are all powered by 3.3V regulators.
[0054] The GNSS power module supplies power to the SIM card module, GNSS positioning module, 4G module, USB module, audio amplifier, and speaker.
[0055] The SPDT power module supplies power to the RF switching SPDT;
[0056] The MCU power module supplies power to the MCU, wake-up module, voltage detection module, LEDs, and CAN module.
[0057] The MCU is model AT32F415KBU7-4; the 4G module is model EC200U; the GNSS positioning module is model ATGM336H; the RF switching SPDT is model HMC8038LP4CETR; the CAN module is model TJA1044T; the wake-up module is model LSM6DS3; the voltage detection module is model LM2903; the audio amplifier is model MAX98357A; and the USB module is model CH340E.
[0058] In this embodiment, the wake-up module uses an LSM6DS3 IMU chip, which can provide an acceleration signal. The MCU uses this acceleration signal as a wake-up signal.
[0059] The DC-DC module is model SCT2630; the TVS protection module is model SMBJ58A; the battery management chip is model TP4056; and the GNSS power module, MCU power module, and SPDT power module are all model ME6212C33M5G.
[0060] In this embodiment, the collaboration between the voltage detection module and the MCU enables intelligent sensing of the vehicle's ignition status; the K-Line transistor drive circuit ensures the stability of OBD communication; the wake-up module, combined with the IMU, achieves low-power standby and intelligent wake-up; and the power module provides multiple regulated outputs and overvoltage protection to ensure system reliability. Through the above design, this utility model discloses a novel aftermarket vehicle networking OBD terminal with advantages such as stable communication, low power consumption, high compatibility, and multi-functional expansion capabilities in aftermarket vehicle networking applications.
[0061] This invention discloses a novel vehicle networking OBD terminal for aftermarket installations, which solves the technical problems of inaccurate identification of vehicle power supply status, poor communication interface compatibility, and sluggish device wake-up response. This invention can detect the vehicle power supply status in real time, realize intelligent start-stop control, effectively reduce standby power consumption, has K-Line interface level adaptive function, strong communication compatibility, and IMU wake-up mechanism, which can accurately determine the vehicle's motion status and ensure that the communication module starts as needed. The overall system structure is compact and highly reliable, and it is suitable for OBD diagnostic scenarios of multiple vehicle models.
Claims
1. A novel vehicle networking OBD terminal for aftermarket installations, characterized in that: Includes MCU, wake-up module, 4G module, USB module, audio amplifier, speaker, GNSS positioning module, RF switching SPDT, SIM card module, voltage detection module, LED, CAN module and power module; The voltage detection module, LED lights, CAN module, 4G module, and wake-up module are all connected to the MCU. The USB module, audio amplifier, GNSS positioning module, and SIM card module are all connected to the 4G module. The radio frequency switching SPDT is connected to the GNSS positioning module, and the radio frequency switching SPDT is also connected to the AIN1 antenna and the AIN2 antenna respectively. The speaker is connected to the audio amplifier; the voltage detection module is connected to the K-Line single-wire communication interface, and the CAN module is connected to the CAN bus interface. The power supply module provides power to the MCU, wake-up module, 4G module, USB module, audio amplifier, speaker, GNSS positioning module, RF switching SPDT, SIM card module, voltage detection module, LED lights and CAN module.
2. The novel vehicle networking OBD terminal for aftermarket installation as described in claim 1, characterized in that: The voltage detection module includes a voltage comparison unit, which is connected to a K-Line single-wire communication interface. The K-Line single-wire communication interface is connected to the level VIN of the K-line output by the vehicle's OBD system, and is used to detect the vehicle's ignition status or power supply status, and feed the comparison result back to the MCU.
3. A novel vehicle networking OBD terminal for aftermarket installation as described in claim 2, characterized in that: The K-Line single-wire communication interface uses an NPN transistor driver circuit to adapt to the voltage level VIN of the K-line of the vehicle's OBD system, thereby enabling communication with the vehicle's OBD system.
4. A novel vehicle networking OBD terminal for aftermarket installation as described in claim 1, characterized in that: The MCU is model AT32F415KBU7-4; the 4G module is model EC200U; the GNSS positioning module is model ATGM336H; the RF switching SPDT is model HMC8038LP4CETR; the CAN module is model TJA1044T; the wake-up module is model LSM6DS3; the voltage detection module is model LM2903; the audio amplifier is model MAX98357A; and the USB module is model CH340E.
5. A novel vehicle networking OBD terminal for aftermarket installation as described in claim 3, characterized in that: The NPN transistor drive circuit specifically includes diode D25, resistor R27, capacitor C36, resistor R34, capacitor C102, transistor Q27, resistor R532, and capacitor C103. The positive terminal of diode D25 is connected to the K-line, and the negative terminal is connected to the base of transistor Q27 through resistor R27. The negative terminal of diode D25 is also connected to ground through capacitor C36. The connection point between resistor R27 and the base of transistor Q27 is connected to ground through resistor R34. The emitter of transistor Q27 is connected to ground, and the collector is connected to the positive power supply through resistor R532. One end of capacitor C102 is connected to the base of transistor Q27, and the other end is connected to ground. The collector of transistor Q27 is connected to ground through capacitor C103. The collector of transistor Q27 is connected to the voltage detection module.
6. A novel vehicle networking OBD terminal for aftermarket installation as described in claim 1, characterized in that: The power module includes a TVS protection module, a DC-DC module, a battery management chip, a battery pack, a GNSS power module, an MCU power module, and an SPDT power module. The input terminal of the DC-DC module is connected to an external power supply through the TVS protection module, and the output terminal outputs 4.8V power. The battery management chip's input is connected to a 4.8V power supply, and its outputs power the GNSS power module, MCU power module, and SPDT power module, respectively. The battery pack is connected to a battery management chip, and the GNSS power module, MCU power module, and SPDT power module are all powered by 3.3V regulators. The GNSS power module supplies power to the SIM card module, GNSS positioning module, 4G module, USB module, audio amplifier, and speaker. The SPDT power module supplies power to the RF switching SPDT; The MCU power module supplies power to the MCU, wake-up module, voltage detection module, LEDs, and CAN module.
7. A novel vehicle networking OBD terminal for aftermarket installation as described in claim 6, characterized in that: The DC-DC module is model SCT2630; the TVS protection module is model SMBJ58A; the battery management chip is model TP4056; and the GNSS power module, MCU power module, and SPDT power module are all model ME6212C33M5G.