An OBD interface-based vehicle diagnosis and emergency starting power supply integrated system

Abstract

The application provides an OBD interface-based vehicle-mounted diagnosis and emergency starting power supply integrated system, a power supply switching unit is arranged to realize switching between OBD power supply and built-in power supply through a first switching piece and a second switching piece; a charging unit charges the built-in power supply by using the OBD interface, so that there is still a power supply source when the vehicle battery is in power shortage. Thus, the OBD diagnosis module can still work when the vehicle battery is in power shortage, and the starting power supply module can start the vehicle in an emergency.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an integrated system for on-board diagnostics and emergency start-up power supply based on an OBD interface. Background Technology

[0002] In the modern automotive industry, with the continuous growth of car ownership and the increasing intelligence of vehicles, the demand for vehicle condition monitoring and emergency support equipment is becoming increasingly prominent.

[0003] Currently, the market offers two main product categories: traditional OBD diagnostic devices and car jump starters. However, these products suffer from significant technical limitations. Firstly, there's the issue of limited functionality. Traditional OBD diagnostic tools only offer vehicle fault diagnosis capabilities, reading fault codes and monitoring sensor data to help owners or repair personnel assess the vehicle's condition. Car jump starters, on the other hand, focus solely on providing starting power when the vehicle battery is low, enabling the engine to start. This forces users who want to monitor vehicle status continuously and prepare for unexpected battery depletion to carry two completely separate devices, causing significant inconvenience in terms of both ease of use and storage. Secondly, power supply limitations are a major concern. Traditional OBD devices rely entirely on the vehicle battery. If the battery is low on power, such as due to prolonged parking causing self-discharge or a faulty alternator preventing charging, the OBD device malfunctions, its real-time vehicle status monitoring is interrupted, and it cannot provide timely feedback on the vehicle's operating status.

[0004] Therefore, there is a need to provide an integrated system for vehicle diagnostics and emergency starter power supply based on the OBD interface. Utility Model Content

[0005] In view of this, it is necessary to provide an integrated on-board diagnostic and emergency starter system based on the OBD interface to solve the above problems.

[0006] Embodiments of this application provide an integrated on-board diagnostic and emergency jump starter system based on an OBD interface, comprising: OBD diagnostic module, connected to the OBD interface; The power module is started, including a power supply component and a control switch component, wherein the control switch component is connected to the power supply component and the OBD interface; The power management module includes a voltage detection unit, a charging unit, and a power supply switching unit. The voltage detection unit is connected to an OBD interface. One end of the charging unit is connected to the power supply component, and the other end is connected to the OBD interface. The power supply switching unit includes a first switching component and a second switching component. The source of the first switching component is connected to the OBD interface, and the source of the second switching component is connected to the power supply component. The control module is connected to the OBD diagnostic module, the startup power module, and the power management module, respectively.

[0007] In at least one embodiment of this application, the control switch of the power supply module is a MOS transistor switch, the gate of the MOS transistor switch is connected to the control module, the drain is connected to the positive terminal of the power supply device, and the source is connected to the OBD interface through a wire.

[0008] In at least one embodiment of this application, the voltage detection unit is provided with a first threshold and a second threshold. When the OBD interface voltage is detected to be higher than the first threshold, a high-level signal is output to the control module; When the OBD interface voltage is detected to be lower than the second threshold, a low-level signal is output to the control module.

[0009] In at least one embodiment of this application, the first switching element and the second switching element of the power supply switching unit are interlocked. When the control module receives a high-level signal from the voltage detection unit, it controls the first switching element to be turned on and the second switching element to be turned off. When a low-level signal is received, the second switching element is turned on and the first switching element is turned off.

[0010] In at least one embodiment of this application, the control module includes a main control chip, which is electrically connected to the communication interface of the OBD diagnostic module, the control switch, the charging unit, and the control terminal of the power supply switching unit, respectively, and is used to receive signals and output control commands.

[0011] In at least one embodiment of this application, both the first switching element and the second switching element are MOS transistors, the first switching element and the second switching element are connected in parallel, and the drains of both the first switching element and the second switching element are connected to a power supply terminal.

[0012] In at least one embodiment of this application, the voltage detection unit is connected to an input pin of the OBD interface, and the input pin is 12VIN.

[0013] In at least one embodiment of this application, the power management module further includes a protection unit connected to the power supply component for circuit protection of the power supply component.

[0014] In at least one embodiment of this application, the control module further includes a button module, one end of which is connected to the main control chip through a current-limiting resistor, and the other end is grounded.

[0015] In at least one embodiment of this application, the control module further includes a status display module, which is connected to the main control chip.

[0016] The aforementioned integrated on-board diagnostic and emergency jump starter system based on the OBD interface achieves switching between OBD power supply and built-in power supply via a power switching unit using a first and second switching element. The charging unit utilizes the OBD interface to charge the built-in power supply, ensuring a power source is available even when the battery is low. This allows the OBD diagnostic module to continue operating when the vehicle battery is low, while the jump starter module can simultaneously start the vehicle in an emergency. Attached Figure Description

[0017] Figure 1 This is a system block diagram of the integrated on-board diagnostic and emergency starter system based on the OBD interface in this application embodiment.

[0018] Figure 2 This is a system block diagram of the power management module.

[0019] Figure 3 This is a partial circuit diagram of the power management module.

[0020] Figure 4 This is a circuit diagram of another part of the power management module.

[0021] Figure 5 This is a circuit diagram of the main control chip in the control module of the embodiment.

[0022] Figure 6 This is a circuit diagram of the discharge unit in the embodiment.

[0023] Figure 7 This is a circuit diagram of the charging unit in the embodiment.

[0024] Figure 8 This is a circuit diagram of the power supply switching unit in the embodiment.

[0025] Figure 9 This is a circuit diagram of the button unit in the embodiment.

[0026] Explanation of main component symbols 100. Integrated system for vehicle diagnostics and emergency jump starter based on OBD interface; 10. OBD diagnostic module; 20. Jump starter module; 21. Power supply component; 22. Control switch component; 30. Power management module; 31. Voltage detection unit; 32. Charging unit; 33. Power supply switching unit; 40. Control module; U3. Main control chip. Detailed Implementation

[0027] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0029] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] according to Figures 1-9 This application provides an integrated vehicle diagnostic and emergency starter system 100 based on the OBD interface, including: an OBD diagnostic module 10, a starter module 20, a power management module 30, and a control module 40.

[0031] The OBD diagnostic module 10 is connected to the OBD interface. The startup power module 20 includes a power supply component 21 and a control switch component 22, with the control switch component 22 connecting the power supply component 21 and the OBD interface. The power management module 30 includes a voltage detection unit 31, a charging unit 32, and a power supply switching unit 33. The voltage detection unit 31 is connected to the OBD interface. One end of the charging unit 32 is connected to the power supply component 21, and the other end is connected to the OBD interface. The power supply switching unit 33 includes a first switching component and a second switching component. The source of the first switching component is connected to the OBD interface, and the source of the second switching component is connected to the power supply component 21. The control module 40 is connected to the OBD diagnostic module 10, the startup power module 20, and the power management module 30, respectively.

[0032] Specifically, the OBD diagnostic module 10 is directly connected to the vehicle's OBD interface through a hardware interface, establishes communication with the vehicle through the OBD interface, reads fault codes and real-time data, and transmits the data to the control module 40.

[0033] The power supply unit 21 is the energy storage core of the starting power module 20. In this embodiment, it is BAT+, which is used to provide the power required for emergency starting when the vehicle battery is low. Specifically, it is a rechargeable lithium battery pack that can be charged through the OBD interface.

[0034] The control switch 22 is an electronic switch that connects the power supply unit 21 to the OBD interface. It is used to control the power supply unit 21 to output electrical energy to the vehicle. Specifically, it is a MOSFET switch circuit.

[0035] In this embodiment, a driving circuit composed of Q3 and Q4 works in conjunction with Q1. The source of Q1 is connected to the power supply component 21, the drain is connected to the vehicle via a pin of the OBD interface, and the gate is controlled by the main control chip U3 through the Q3 or Q4 driving circuit. The startup power module 20 receives control signals from the main control chip U3, such as high or low levels. When an emergency start is required, it is turned on, allowing the power supply component 21 to transmit power to the vehicle through the OBD interface; after startup is completed, it is turned off, cutting off the power supply circuit to avoid power waste or reverse discharge.

[0036] The voltage detection unit 31 monitors the input voltage of the OBD interface in real time, providing a basis for judgment on power supply switching and system protection. In this embodiment, the voltage detection unit 31 detects whether the voltage of the connected vehicle battery is greater than 10.5V. If the voltage detection unit 31 determines that the vehicle battery voltage is greater than 10.5V, the control module 40 turns on the first switching element and turns off the second switching element, and the system is powered by the vehicle battery. If the voltage detection unit 31 finds that the vehicle battery voltage is ≤10.5V, it immediately sends a signal to the control module 40. The control module 40 quickly cuts off the first switching element and turns on the second switching element, and the system seamlessly switches to power supply 21; the OBD diagnostic module continues to work (powered by power supply 21), ensuring that vehicle status monitoring is uninterrupted.

[0037] Both the first and second switching elements are P-channel MOSFETs. In this embodiment, the first switching element is Q1 and the second switching element is Q2. The source of Q1 is connected to the 12V input terminal of the OBD interface, and the gate is connected to the control module 40. The source of Q2 is connected to the power supply element 21.

[0038] The control module 40 is the core of the system, responsible for receiving, processing and displaying data from the OBD diagnostic module 10, receiving signals from the voltage detection unit 31, and controlling the operation of the power supply switching unit 33. In one specific embodiment of this application, the control switch 22 of the power supply module 20 is a MOS transistor switch. The gate of the MOS transistor switch is connected to the control module 40, the drain is connected to the positive terminal of the power supply unit 21, and the source is connected to the OBD interface through a wire.

[0039] In a specific embodiment of this application, the voltage detection unit 31 is provided with a first threshold and a second threshold. When the OBD interface voltage is detected to be higher than the first threshold, a high-level signal is output to the control module 40; when the OBD interface voltage is detected to be lower than the second threshold, a low-level signal is output to the control module 40.

[0040] Specifically, the first threshold is greater than 10.5V, and the second threshold is less than or equal to 10.5V. The design automatically switches to the battery power supply unit 21 when the voltage is below 10.5V. The first threshold of greater than 10.5V is used to determine that the vehicle battery voltage is in a normal state, the vehicle is operating normally, or the battery has sufficient charge.

[0041] After the system is connected to the OBD interface, the voltage detection unit 31 immediately starts to detect the OBD interface voltage. Its internal comparator circuit (such as LM393) compares the detected voltage with the preset first threshold and second threshold.

[0042] In a specific embodiment of this application, the first switching element and the second switching element of the power supply switching unit 33 are interlocked. When the control module 40 receives a high-level signal from the voltage detection unit 31, it controls the first switching element to be turned on and the second switching element to be turned off; when it receives a low-level signal, it controls the second switching element to be turned on and the first switching element to be turned off.

[0043] Specifically, if the detected voltage is lower than or equal to the second threshold, the voltage detection unit 31 outputs a low-level signal to the control module 40. After receiving the low-level signal, the control module 40 determines that the vehicle battery is low on power and immediately controls the first switching element of the power supply switching unit 33 to be turned off and the second switching element connected to the power supply element 21 to be turned on, seamlessly switching to the built-in battery power supply.

[0044] In this embodiment, after the first switching device is turned on, the vehicle's 12V power supply powers the OBD diagnostic module 10 and control module 40 via a "12V to 5V / 3.3V circuit," while the charging unit 32 starts to charge the built-in power supply component 21. After the second switching device is turned on, the built-in power supply component 21 outputs 3.3V / 5V via an "LDO voltage regulator circuit" such as "U2" to continuously power the OBD diagnostic module 10 and control module 40, ensuring uninterrupted diagnostic function.

[0045] In a specific embodiment of this application, the control module 40 includes a main control chip U3, which is electrically connected to the communication interface of the OBD diagnostic module 10, the control switch 22, the charging unit 32, and the control terminal of the power supply switching unit 33, respectively, and is used to receive signals and output control commands.

[0046] Specifically, in this embodiment, the main control chip U3 is a YM1141 / CSU38F20-QFN24 series MCU. The main control chip U3 is connected to the OBD diagnostic module 10 through the MCU_CAN_TX and MCU_CAN_RX pins on the main control chip U3. The OBD diagnostic module reads vehicle fault codes and transmits the data to the main control chip U3 through these pins. The main control chip U3 receives and processes the data.

[0047] In this embodiment, the control switch 22 is connected to the I / O pin of the main control chip U3 via a resistor. When the user triggers emergency start, the main control chip U3 outputs a high-level signal to its gate, controlling the control switch 22 to conduct, so that the power supply unit 21 outputs starting current to the vehicle through the OBD interface; after the start is completed, it outputs a low-level signal to cut off the power supply.

[0048] In this embodiment, the core of the charging unit 32 is a CX8855 power management IC, whose control terminal is connected to the main control chip U3. The main control chip U3 controls the charging mode, starts or stops charging of the CX8855 by outputting PWM signals or high and low levels.

[0049] In one specific embodiment of this application, both the first switching element and the second switching element are MOS transistors, the first switching element and the second switching element are connected in parallel, and the drains of both the first switching element and the second switching element are connected to the power supply terminal.

[0050] In one specific embodiment of this application, the voltage detection unit 31 is connected to the input pin of the OBD interface, and the input pin is 12VIN.

[0051] Specifically, when the voltage detection unit 31 detects a 12V input voltage at the OBD interface, it outputs a power-on trigger signal to the main control chip U3 of the control module 40. After receiving the signal, the main control chip U3 controls the first or second switching element of the power supply switching unit 33 to turn on, providing working voltage for the OBD diagnostic module 10 and other power-consuming modules of the system, thereby enabling the system to start automatically.

[0052] In one specific embodiment of this application, the power management module 30 further includes a protection unit, which is connected to the power supply component 21 and is used to provide circuit protection for the power supply component 21.

[0053] Specifically, the protection unit is a resistor or diode, and the built-in power supply unit 21 is equipped with an over-discharge resistor. Its core function is to prevent the power supply unit 21 from experiencing performance degradation or damage due to over-discharge. When the built-in power supply unit 21 is depleted, the resistor will trigger the over-discharge protection, automatically cutting off the battery's output circuit. At this time, the battery stops supplying power to the system.

[0054] In one specific embodiment of this application, a button module is also included. One end of the button module is connected to the main control chip U3 through a current-limiting resistor, and the other end is grounded.

[0055] Specifically, the button module includes physical buttons, such as POWER_KEY and KEY_OK, and current-limiting resistors. One end of the current-limiting resistor is connected to the main control chip U3, and the other end is directly grounded. When a button is pressed, the circuit is turned on, and the corresponding pin of the main control chip U3 detects a low-level signal, thereby recognizing the user operation, such as powering on, confirming, or activating emergency mode.

[0056] If the vehicle has been parked for an extended period and the battery is completely depleted, resulting in no 12V at the OBD interface, the system cannot automatically power on. The user presses the "POWER_KEY," triggering the system startup via the button module. Power is supplied through the built-in power supply unit 21, and the OBD diagnostic module 10 reads the vehicle's complete battery depletion fault code. The user then confirms the emergency start by pressing the button again.

[0057] In one specific embodiment of this application, a status display module is also included, which is connected to the main control chip U3.

[0058] Specifically, the status display module uses the STM32's FSMC interface to drive a 4.3-inch TFT LCD screen, displaying information in real time on the same screen. This information includes, but is not limited to, battery power, charging / discharging status, light status, alarm information, etc.

[0059] Therefore, the aforementioned integrated vehicle diagnostic and emergency jump starter system 100 based on the OBD interface, through a power supply switching unit 33 using a first switching element and a second switching element, enables switching between OBD power supply and the built-in power supply component 21; the charging unit 32 uses the OBD interface to charge the built-in power supply component 21, ensuring a power source is still available when the battery is low. This allows the OBD diagnostic module to continue operating even when the vehicle battery is low, while the jump starter module 20 can simultaneously start the vehicle in an emergency.

[0060] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. An integrated system for on-board diagnostics and emergency jump starter based on an OBD interface, characterized in that, include: OBD diagnostic module, connected to the OBD interface; The power module is started, including a power supply component and a control switch component, wherein the control switch component is connected to the power supply component and the OBD interface; The power management module includes a voltage detection unit, a charging unit, and a power supply switching unit. The voltage detection unit is connected to an OBD interface. One end of the charging unit is connected to the power supply component, and the other end is connected to the OBD interface. The power supply switching unit includes a first switching component and a second switching component. The source of the first switching component is connected to the OBD interface, and the source of the second switching component is connected to the power supply component. The control module is connected to the OBD diagnostic module, the startup power module, and the power management module, respectively.

2. The integrated system for vehicle diagnostics and emergency starter power supply based on OBD interface according to claim 1, characterized in that, The control switch of the power supply module is a MOS transistor switch. The gate of the MOS transistor switch is connected to the control module, the drain is connected to the positive terminal of the power supply unit, and the source is connected to the OBD interface through a wire.

3. The integrated vehicle diagnostic and emergency starter system based on the OBD interface according to claim 1, characterized in that, The voltage detection unit is equipped with a first threshold and a second threshold. When the OBD interface voltage is detected to be higher than the first threshold, a high-level signal is output to the control module; When the OBD interface voltage is detected to be lower than the second threshold, a low-level signal is output to the control module.

4. The integrated system for vehicle diagnostics and emergency starter power supply based on OBD interface according to claim 3, characterized in that, The first and second switching components of the power supply switching unit are interlocked. When the control module receives a high-level signal from the voltage detection unit, it controls the first switching element to be turned on and the second switching element to be turned off. When a low-level signal is received, the second switching element is turned on and the first switching element is turned off.

5. The integrated on-board diagnostic and emergency starter system based on the OBD interface according to claim 4, characterized in that, The control module includes a main control chip, which is electrically connected to the communication interface of the OBD diagnostic module, the control switch, the charging unit, and the control terminal of the power supply switching unit, respectively, and is used to receive signals and output control commands.

6. The integrated on-board diagnostic and emergency starter system based on the OBD interface according to claim 5, characterized in that, Both the first switching element and the second switching element are MOSFETs, and the first switching element and the second switching element are connected in parallel. The drains of both the first switching element and the second switching element are connected to the power supply terminal.

7. The integrated vehicle diagnostic and emergency starter system based on the OBD interface according to claim 1, characterized in that, The voltage detection unit is connected to the input pin of the OBD interface, and the input pin is 12VIN.

8. The integrated system for vehicle diagnostics and emergency starter power supply based on OBD interface according to claim 1, characterized in that, The power management module also includes a protection unit, which is connected to the power supply component and is used to provide circuit protection for the power supply component.

9. The integrated vehicle diagnostic and emergency starter system based on the OBD interface according to claim 6, characterized in that, The control module also includes a button module, one end of which is connected to the main control chip through a current-limiting resistor, and the other end is grounded.

10. The integrated vehicle diagnostic and emergency starter system based on the OBD interface according to claim 5, characterized in that, The control module also includes a status display module, which is connected to the main control chip.

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