Vehicle diagnostic instrument

Abstract

A vehicle diagnostic apparatus comprises: a control module; the battery module is used for providing power for the control module; and the first voltage conversion circuit is connected with the battery module and is used for converting the voltage provided by the battery module into the voltage adaptive to the control module. According to the diagnostic instrument, the electric quantity is provided for the voltage signal acquisition process of the vehicle electrical system through the built-in battery module, the whole process is simple and easy to implement, and measurement errors caused by improper manual operation can be effectively avoided while the measurement process can be simplified.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle diagnostic technology, and in particular relates to a vehicle diagnostic instrument. Background Technology

[0002] With the rapid development of vehicle technology, the importance of vehicle fault diagnosis is increasing. Currently, vehicle diagnostic tools mainly activate or test vehicle electrical components by outputting stable voltage signals, or collect voltage or resistance signals from the vehicle's electrical system through probes. After signal processing and analog-to-digital conversion, the actual voltage value is displayed to assist technicians in fault diagnosis and maintenance. However, before using common vehicle diagnostic tools, whether outputting stable voltage signals or collecting voltage signals, it is necessary to first open the vehicle's engine compartment, locate the positive and negative terminals of the battery in the engine compartment, and then use wire clips to connect the positive and negative wires of the vehicle diagnostic tool to the positive and negative terminals of the battery. This operation method is redundant for the process of collecting voltage signals from the vehicle's electrical system, because the collection process does not actually require a voltage signal from the vehicle's engine compartment; it only needs to provide sufficient voltage to the processing circuitry inside the vehicle diagnostic tool. Therefore, for the process of collecting voltage signals from the vehicle's electrical system, this operation is not only cumbersome but also prone to inaccurate measurement results due to improper operation. Utility Model Content

[0003] In view of this, the present invention provides a vehicle diagnostic instrument, which aims to solve the problem of cumbersome operation when measuring voltage or resistance in traditional technical solutions, and can ensure the accuracy of voltage or resistance measurement results.

[0004] This utility model provides a vehicle diagnostic tool, including: a control module; a battery module for providing power to the control module; and a first voltage conversion circuit connected to the battery module for converting the voltage provided by the battery module into a voltage adapted to the control module.

[0005] In one embodiment, the vehicle diagnostic tool further includes: a connection cable for connecting or disconnecting from an external power source;

[0006] The second voltage conversion circuit, connected to the connecting line, is used to convert the voltage provided by the external power supply into the voltage of the control module when the connecting line is connected to the external power supply.

[0007] The power switching circuit is connected to the first voltage conversion circuit and the second voltage conversion circuit respectively. When the connection line is connected to the external power supply, it turns on the second voltage conversion circuit and the control module. When the connection line is disconnected from the external power supply, it turns on the first voltage conversion circuit and the control module.

[0008] In one embodiment, the vehicle diagnostic tool further includes a protection module connected between the connection line and the second voltage conversion circuit to prevent damage caused by improper connection when the connection line is connected to an external power source.

[0009] In one embodiment, the protection module includes an overcurrent protection unit and / or a reverse connection protection unit.

[0010] In one embodiment, the first voltage conversion circuit includes: a first voltage regulator module and a first filter module; the first voltage regulator module is used to convert the voltage provided by the battery module into a voltage that is compatible with the control module; the first filter module is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module.

[0011] In one embodiment, the first filter module includes a first capacitor, a second capacitor, and a third capacitor; the first voltage regulator module includes a first inductor and a first voltage regulator chip; the first terminal of the first capacitor is connected to the battery module, and the second terminal of the second capacitor is grounded; the first terminal of the first inductor is connected to the first terminal of the first capacitor, and the second terminal of the first inductor is connected to the first terminal of the first voltage regulator chip; the second terminal of the first voltage regulator chip is grounded, and the third terminal of the first voltage regulator chip is connected to both the first terminal of the second capacitor and the first terminal of the third capacitor, and the first terminals of the second capacitor and the first terminals of the third capacitor are connected to the control module, and the second terminals of the second capacitor and the second terminals of the third capacitor are both grounded.

[0012] In one embodiment, the second voltage conversion circuit includes: a second voltage regulator module and a second filter module; the second voltage regulator module is used to convert the voltage supplied by the external power supply into a voltage that adapts to the control module; the second filter module is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module.

[0013] In one embodiment, the second filter module includes a fourth capacitor, a fifth capacitor, and a sixth capacitor; the second voltage regulator module includes a second voltage regulator chip and an adjustable resistor; the first terminal of the fourth capacitor is grounded, and the second terminal of the fourth capacitor is connected to a connecting line and the first terminal of the second voltage regulator chip; the second terminal of the second voltage regulator chip is connected to the adjustable terminal of the adjustable resistor, and the third terminal of the second voltage regulator chip is connected to the first terminals of the fifth capacitor and the sixth capacitor, and the first terminals of the fifth capacitor and the sixth capacitor are connected to a power switching circuit, and the second terminals of the fifth capacitor and the sixth capacitor are both grounded; the first fixed terminal of the adjustable resistor is grounded, and the second fixed terminal of the adjustable resistor is connected to the first terminals of the fifth capacitor and the sixth capacitor.

[0014] In one embodiment, the power switching circuit includes: a first diode, a resistor, and a MOSFET; the anode of the first diode is connected to both the first voltage conversion circuit and the gate of the MOSFET, and the cathode of the first diode is connected to the source of the MOSFET; the first terminal of the resistor is grounded, and the second terminal of the resistor is connected to the gate of the MOSFET; the drain of the MOSFET is connected to the second voltage conversion circuit, and the cathode of the first diode and the source of the MOSFET are connected to the control module.

[0015] In one embodiment, the vehicle diagnostic tool further includes: a battery module charge detection unit, and / or an external power supply voltage detection unit.

[0016] The vehicle diagnostic tool provided in this application includes: a control module; a battery module for providing power to the control module; and a first voltage conversion circuit connected to the battery module for converting the voltage provided by the battery module into a voltage compatible with the control module. This diagnostic tool enables the acquisition of voltage signals from the vehicle's electrical system using its built-in battery module. The entire process is simple and easy to implement, simplifying the measurement procedure while effectively avoiding measurement errors caused by improper manual operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1a This is a schematic diagram of the structure of a vehicle diagnostic instrument provided in an embodiment of the present invention;

[0019] Figure 1b This is a schematic diagram of the structure of a vehicle diagnostic instrument provided in another embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a vehicle diagnostic instrument provided in another embodiment of the present invention;

[0021] Figure 3 A circuit diagram of a first voltage conversion circuit provided in an embodiment of the present invention;

[0022] Figure 4 A circuit diagram of a first voltage conversion circuit provided in another embodiment of the present invention;

[0023] Figure 5 A circuit diagram of a second voltage conversion circuit provided in an embodiment of the present invention;

[0024] Figure 6 A circuit diagram of a second voltage conversion circuit provided in another embodiment of the present invention;

[0025] Figure 7 A schematic diagram of the circuit structure of a power switching circuit provided in an embodiment of this utility model;

[0026] Figure 8 This is a schematic diagram of the structure of a vehicle diagnostic instrument provided in another embodiment of the present invention. Detailed Implementation

[0027] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] This utility model embodiment provides a vehicle diagnostic tool; please refer to [link / reference]. Figure 1a As shown, Figure 1aThis is a schematic diagram of a vehicle diagnostic instrument provided according to an embodiment of the present invention. Figure 1a The vehicle diagnostic tool includes: a control module 10; a battery module 11 connected to the control module 10 to provide power to the control module 10; and a first voltage conversion circuit 12 connected to both the battery module 11 and the control module 10 to convert the voltage provided by the battery module 11 into a voltage compatible with the control module 10. This vehicle diagnostic tool provides power to the voltage signal acquisition process of the vehicle's electrical system through its built-in battery module. The entire process is simple and easy to implement, simplifying the measurement procedure while effectively avoiding measurement errors caused by improper manual operation.

[0033] The battery module 11 can be detachably connected to the diagnostic tool or fixed inside the diagnostic tool housing. For example, Figure 1b As shown, a battery compartment can be provided on the casing of the diagnostic instrument to house the battery module. In other words, the battery module can be detachably placed inside the battery compartment, forming an integrated structure with the diagnostic instrument. Specifically, the location of the battery compartment can be flexibly configured and is not limited here. The battery module includes, but is not limited to, any one of the following: lithium-ion battery, lithium polymer battery, lithium iron phosphate battery, nickel-metal hydride battery, or nickel-cadmium battery.

[0034] It should be noted that the vehicle diagnostic tool provided in this application embodiment can also have the voltage required for the control module supplied by an external power source. Specifically, depending on the needs of the actual application scenario, the voltage can be provided by an external power source or by the battery module, thereby improving the flexibility of the vehicle diagnostic tool application.

[0035] In one embodiment, such as Figure 2 As shown, the vehicle diagnostic tool further includes: a connecting cable 13 for connecting or disconnecting from an external power source; a second voltage conversion circuit 14 connected to the connecting cable 13 for converting the voltage provided by the external power source into a voltage compatible with the control module 10 when the connecting cable 13 is connected to the external power source; and a power switching circuit 15 connected to the first voltage conversion circuit 12 and the second voltage conversion circuit 14 respectively, for connecting the second voltage conversion circuit 14 to the control module 10 when the connecting cable 13 is connected to the external power source, and connecting the first voltage conversion circuit 12 to the control module 10 when the connecting cable 13 is disconnected from the external power source.

[0036] By incorporating a power switching circuit between the first and second voltage conversion circuits, when the vehicle diagnostic tool is connected to an external power source via a connecting cable, the external power source provides the necessary voltage to the control module. Conversely, when the vehicle diagnostic tool is disconnected from the external power source, the battery module provides the necessary voltage to the control module. This allows the vehicle diagnostic tool to operate regardless of the availability of an external power source, enhancing its application flexibility.

[0037] In one embodiment, such as Figure 3 As shown, the first voltage conversion circuit 12 includes: a first voltage regulator module 120 and a first filter module 121; the first voltage regulator module 120 is used to convert the voltage provided by the battery module 11 into a voltage that is compatible with the control module; the first filter module 121 is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module.

[0038] In one embodiment, such as Figure 4 As shown, the first filter module 121 includes a first capacitor 40, a second capacitor 41, and a third capacitor 42; the first voltage regulator module 120 includes a first inductor 43 and a first voltage regulator chip 44; the first end of the first capacitor 40 is connected to the battery module 11, and the second end of the second capacitor 41 is grounded; the first end of the first inductor 43 is connected to the first end of the first capacitor 40, and the second end of the first inductor 43 is connected to the first end of the first voltage regulator chip 120; the second end of the first voltage regulator chip 120 is grounded, and the third end of the first voltage regulator chip 120 is connected to both the first end of the second capacitor 41 and the first end of the third capacitor 42, and the first ends of the second capacitor 41 and the third capacitor 42 are connected to the control module 10, and the second ends of the second capacitor 41 and the second ends of the third capacitor 42 are both grounded.

[0039] In one embodiment, such as Figure 5 As shown, the second voltage conversion circuit 14 includes: a second voltage regulator module 140 and a second filter module 141; the second voltage regulator module 140 is used to convert the voltage provided by the external power supply into a voltage that adapts to the control module 10; the second filter module 141 is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module 10.

[0040] In one embodiment, such as Figure 6 As shown, the second filter module 141 includes: a fourth capacitor 60, a fifth capacitor 61, and a sixth capacitor 62; the second voltage regulator module 140 includes a second voltage regulator chip 63 and an adjustable resistor 64; the first terminal of the fourth capacitor 60 is grounded, and the second terminal of the fourth capacitor 60 is connected to the connecting line 13 and the first terminal of the second voltage regulator chip 63; the second terminal of the second voltage regulator chip 63 is connected to the adjustable terminal of the adjustable resistor 64, and the third terminal of the second voltage regulator chip 63 is connected to the first terminal of the fifth capacitor 61 and the first terminal of the sixth capacitor 62, and the first terminals of the fifth capacitor 61 and the sixth capacitor 62 are connected to the power switching circuit 15, and the second terminals of the fifth capacitor 61 and the sixth capacitor 62 are both grounded; the first fixed terminal of the adjustable resistor 64 is grounded, and the second fixed terminal of the adjustable resistor 64 is connected to the first terminals of the fifth capacitor 61 and the sixth capacitor 62.

[0041] In one embodiment, such as Figure 7 As shown, the power switching circuit 15 includes: a first diode 150, a resistor 151, and a MOSFET 152; the anode of the first diode 150 is connected to both the first voltage conversion circuit 12 and the gate of the MOSFET 152, and the cathode of the first diode 150 is connected to the source of the MOSFET 152; the first terminal of the resistor 151 is grounded, and the second terminal of the resistor 151 is connected to the gate of the MOSFET 152; the drain of the MOSFET 152 is connected to the second voltage conversion circuit 14, and the cathode of the first diode 150 and the source of the MOSFET 152 are connected to the control module 10.

[0042] In one embodiment, a capacitor can be connected between the power switching circuit and the control module to effectively prevent voltage surges during power switching. Specifically, by connecting the first end of at least one capacitor to both the output of the power switching circuit and the control module, and grounding the second end of at least one capacitor, voltage surges during power switching can be effectively prevented.

[0043] In one embodiment, such as Figure 8 As shown, the vehicle diagnostic tool also includes a protection module 16, connected between the connecting line 13 and the second voltage conversion circuit 14, to prevent damage caused by improper connection when the connecting line 13 is connected to an external power source.

[0044] In one embodiment, the protection module 16 includes an overcurrent protection unit and / or a reverse connection protection unit. Exemplarily, the overcurrent protection unit includes, but is not limited to, a resettable fuse connected between the connection line and the first voltage conversion circuit to prevent damage due to excessive current; the reverse connection protection unit includes, but is not limited to, a reverse connection protection diode connected between the overcurrent protection unit and the first voltage conversion circuit to prevent damage caused by reverse connection of the positive and negative terminals of the connection line with the positive and negative terminals of the external power supply.

[0045] In one embodiment, the vehicle diagnostic tool further includes: a battery module power detection unit and / or an external power supply voltage detection unit. The battery module power detection unit monitors the state of charge of the battery module; the external power supply voltage detection unit monitors the connection status of the external power supply. Specifically, no limitations are made on the battery module power detection unit and the external power supply voltage detection unit. Exemplarily, the battery module power detection unit is connected between the battery module and the control module. Furthermore, a filter unit may be connected between the battery module power detection unit and the first voltage conversion circuit to improve the accuracy of battery power detection. The external power supply voltage detection unit is connected between the connection line and the control module, and monitors the voltage of the external power supply in real time when the connection line is connected to the external power supply.

[0046] In one embodiment, the vehicle diagnostic tool further includes a display screen and control buttons. The display screen shows the external power connection status or battery power status. The control buttons are used to control the operating status of the control module.

[0047] As can be seen from the above analysis, the vehicle diagnostic instrument provided in this application can provide power for the voltage signal acquisition process of the vehicle's electrical system through its built-in battery module. The whole process is simple and easy to implement, which can simplify the measurement process and effectively avoid measurement errors caused by improper manual operation.

[0048] Furthermore, the vehicle diagnostic tool provided in this application can also be connected to an external power source via a connecting cable. Through a power switching circuit, when the external power source is connected, it connects the external power source and the control module, supplying power from the external power source. When the external power source is disconnected, it connects the battery module and the control module, supplying power from the battery module. This achieves switching between external power and battery module power, making the vehicle diagnostic tool more flexible to use.

[0049] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A vehicle diagnostic tool, characterized in that, include: Control module; A battery module is used to provide power to the control module; A first voltage conversion circuit is connected to the battery module and is used to convert the voltage provided by the battery module into a voltage that is compatible with the control module. Connecting cable, used to connect or disconnect from an external power source; A second voltage conversion circuit, connected to the connecting line, is used to convert the voltage provided by the external power supply into a voltage adapted to the control module when the connecting line is connected to the external power supply. A power switching circuit is connected to the first voltage conversion circuit and the second voltage conversion circuit respectively, and is used to connect the second voltage conversion circuit to the control module when the connection line is connected to the external power supply, and to connect the first voltage conversion circuit to the control module when the connection line is disconnected from the external power supply.

2. The vehicle diagnostic instrument as described in claim 1, characterized in that, The vehicle diagnostic tool further includes a protection module connected between the connecting line and the second voltage conversion circuit to prevent damage caused by improper connection when the connecting line is connected to the external power supply.

3. The vehicle diagnostic instrument as described in claim 2, characterized in that, The protection module includes: an overcurrent protection unit and / or a reverse connection protection unit.

4. The vehicle diagnostic instrument as described in claim 1, characterized in that, The first voltage conversion circuit includes: a first voltage regulator module and a first filter module; The first voltage regulator module is used to convert the voltage provided by the battery module into a voltage that is compatible with the control module; The first filtering module is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module.

5. The vehicle diagnostic tool as described in claim 4, characterized in that, The first filter module includes a first capacitor, a second capacitor, and a third capacitor; the first voltage regulator module includes a first inductor and a first voltage regulator chip; the first terminal of the first capacitor is connected to the battery module, and the second terminal of the second capacitor is grounded; the first terminal of the first inductor is connected to the first terminal of the first capacitor, and the second terminal of the first inductor is connected to the first terminal of the first voltage regulator chip; the second terminal of the first voltage regulator chip is grounded, and the third terminal of the first voltage regulator chip is connected to both the first terminal of the second capacitor and the first terminal of the third capacitor, and the first terminals of the second capacitor and the third capacitor are connected to the control module, and the second terminals of the second capacitor and the second terminals of the third capacitor are both grounded.

6. The vehicle diagnostic tool as described in claim 1, characterized in that, The second voltage conversion circuit includes: a second voltage regulator module and a second filter module; the second voltage regulator module is used to convert the voltage provided by the external power supply into a voltage adapted to the control module; The second filtering module is used to filter the voltage input to the voltage regulator module and the voltage output by the voltage regulator module.

7. The vehicle diagnostic tool as described in claim 6, characterized in that, The second filter module includes a fourth capacitor, a fifth capacitor, and a sixth capacitor; the second voltage regulator module includes a second voltage regulator chip and an adjustable resistor; the first terminal of the fourth capacitor is grounded, and the second terminal of the fourth capacitor is connected to the connecting line and the first terminal of the second voltage regulator chip; the second terminal of the second voltage regulator chip is connected to the adjustable terminal of the adjustable resistor, and the third terminal of the second voltage regulator chip is connected to the first terminal of the fifth capacitor and the first terminal of the sixth capacitor, and the first terminals of the fifth capacitor and the sixth capacitor are connected to the power switching circuit, and the second terminals of the fifth capacitor and the sixth capacitor are both grounded; the first fixed terminal of the adjustable resistor is grounded, and the second fixed terminal of the adjustable resistor is connected to the first terminal of the fifth capacitor and the first terminal of the sixth capacitor.

8. The vehicle diagnostic tool as described in claim 1, characterized in that, The power switching circuit includes: a first diode, a resistor, and a MOSFET; the anode of the first diode is connected to both the first voltage conversion circuit and the gate of the MOSFET, and the cathode of the first diode is connected to the source of the MOSFET; the first terminal of the resistor is grounded, and the second terminal of the resistor is connected to the gate of the MOSFET; the drain of the MOSFET is connected to the second voltage conversion circuit, and the cathode of the first diode and the source of the MOSFET are connected to the control module.

9. The vehicle diagnostic instrument as described in claim 1, characterized in that, Also includes: Battery module power detection unit, and / or external power supply voltage detection unit.

Images