Offline detection method and system for vehicle

Abstract

The embodiments of the present application relate to the field of automotive electronic technology, and disclose a vehicle offline detection method and system. The detection method establishes a diagnostic function link, which includes multiple functional nodes, so that the entire test environment can be detected to ensure the normal operation of the vehicle test; and the connection status between adjacent functional nodes and the connection status between non-adjacent functional nodes are determined through power supply relationships, communication relationships, and signal relationships, thereby improving detection efficiency.

Description

Technical Field

[0001] The present application relates to the field of automotive electronic technology, and in particular to an offline detection method and system for a vehicle. Background Art

[0002] With the development of technology, there are more and more parts in the car. If there is a problem with any part, the car may fail to start or break down halfway, so the inspection of the car is becoming more and more important.

[0003] In the field of automobile maintenance, diagnostic equipment is currently mainly connected to vehicle connection equipment, and the vehicle is connected through the vehicle connection equipment to send diagnostic commands to the vehicle to detect whether the status of each component in the vehicle is normal, or to perform related action tests to detect whether each component is working normally.

[0004] However, this method connects the entire vehicle through diagnostic equipment to determine online whether any abnormality occurs in various components of the vehicle, but it is unable to detect the test environment, which can easily affect the normal execution of the test. Summary of the invention

[0005] The embodiments of the present application aim to provide a method and system for offline detection of a vehicle, which can ensure the normal operation of the vehicle test by detecting the entire test environment, and can improve the detection efficiency by detecting multiple aspects such as power supply relationship, communication relationship and signal relationship.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides an offline detection method for a vehicle, the method comprising:

[0008] Establishing a diagnostic function link, wherein the diagnostic function link includes a plurality of function nodes, and the function nodes include a diagnostic device, a vehicle connection device, a component connection device, and an electronic control unit, wherein the diagnostic device is connected to the vehicle connection device, the vehicle connection device is connected to the component connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the whole vehicle environment of the vehicle;

[0009] If there is a power supply relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent functional nodes is determined according to the communication relationship and / or signal relationship;

[0010] Between non-adjacent functional nodes, a functional node determines the connection status of a non-adjacent functional node through the power supply voltage fed back by the adjacent functional node; or, a functional node determines the connection status of a non-adjacent functional node through the response and / or abnormal signal of the diagnostic command.

[0011] In some embodiments, establishing a diagnostic function link includes:

[0012] The diagnostic device sends a link establishment message to the vehicle connection device to establish a link between the diagnostic device and the vehicle connection device;

[0013] The vehicle connection device forwards a link establishment message to the component connection device to establish a link between the vehicle connection device and the component connection device;

[0014] The diagnostic device sends a start command to the vehicle connection device, which forwards the start command to the component connection device, so that the component connection device starts the electronic control unit after receiving the start command to establish a link between the component connection device and the electronic control unit.

[0015] In some embodiments, establishing a diagnostic function link further includes:

[0016] After the diagnostic device establishes a link with the vehicle connection device, the diagnostic device and the vehicle connection device establish a heartbeat detection mechanism.

[0017] In some embodiments, determining the connection status of adjacent functional nodes according to the communication relationship and / or the signal relationship includes:

[0018] If there is a communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the communication response status;

[0019] If there is no communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the signal relationship, wherein the signal relationship includes a level signal and / or a heartbeat signal.

[0020] In some embodiments, the signal relationship includes a heartbeat signal, and determining the connection status of the adjacent functional nodes according to the signal relationship includes:

[0021] If a heartbeat detection mechanism is established between an application of a certain functional node and an adjacent functional node, and no heartbeat response signal sent by the adjacent functional node is received within a preset time, it is determined that a link break anomaly exists between the adjacent functional nodes.

[0022] In some embodiments, the method further comprises:

[0023] The diagnostic device sends a diagnostic command to the vehicle connection device, which forwards the diagnostic command to the component connection device, and the component connection device forwards the diagnostic command to the electronic control unit to obtain the diagnostic result of the electronic control unit.

[0024] In some embodiments, the vehicle connection device, the component connection device and the electronic control unit are communicatively connected via the same bus, and after receiving the diagnostic command sent by the diagnostic device, the vehicle connection device directly forwards the diagnostic command to the electronic control unit.

[0025] In some embodiments, each function node on the diagnostic function link is installed with an application program, and the method further includes:

[0026] The application of the diagnostic device sends a diagnostic command to the application of the vehicle connection device, which forwards the diagnostic command to the application of the component connection device, and the application of the component connection device forwards it to the application of the electronic control unit to obtain the test result of the electronic control unit.

[0027] In some embodiments, the method further comprises:

[0028] If it is identified that the vehicle connection device is connected to the entire vehicle of the vehicle, the link between the vehicle connection device and the component connection device is disconnected to obtain information on the components of the vehicle through the vehicle connection device.

[0029] In some embodiments,

[0030] There is a power supply relationship between the component connection device, the vehicle connection device and the electronic control unit, and the component connection device supplies power to the vehicle connection device and the electronic control unit.

[0031] In some embodiments,

[0032] If the diagnostic device is connected to the vehicle connection device via a wired connection, there is a power supply relationship between the diagnostic device and the vehicle connection device, and the diagnostic device determines the connection state of the vehicle connection device through the power supply relationship.

[0033] In a second aspect, an embodiment of the present application provides an offline detection system for a vehicle, the system comprising: a diagnostic function link, the diagnostic function link comprising: a diagnostic device, a vehicle connection device, a component connection device, and an electronic control unit; wherein,

[0034] A diagnostic device connected to the vehicle connection device and used to send a diagnostic command to the vehicle connection device;

[0035] A vehicle connection device connected to the diagnostic device for receiving a diagnostic command and forwarding the diagnostic command to an electronic control unit;

[0036] Component connection equipment, connected to the car connection equipment, is used to simulate the whole vehicle environment of the car;

[0037] The electronic control unit is connected to the vehicle connection device and the component connection device to receive the diagnosis command and obtain the diagnosis result.

[0038] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned offline detection method for a vehicle is implemented.

[0039] In a fourth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described in the first aspect. The computer program product may be a software installation package.

[0040] The beneficial effect of the embodiments of the present application is as follows: different from the prior art, the embodiments of the present application provide a vehicle offline detection method, the method comprising: establishing a diagnostic function link, wherein the diagnostic function link comprises multiple function nodes, the function nodes comprise a diagnostic device, a vehicle connection device, a component connection device and an electronic control unit, wherein the diagnostic device is connected to the vehicle connection device, the vehicle connection device is connected to the component connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the whole vehicle environment of the vehicle; between adjacent function nodes, if there is a power supply relationship, the connection status of the adjacent function nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent function nodes is determined according to the communication relationship and / or signal relationship; between non-adjacent function nodes, a certain function node determines the connection status of the non-adjacent function node through the power supply voltage fed back by the adjacent function node; or, a certain function node determines the connection status of the non-adjacent function node through the response and / or abnormal signal of the diagnostic command.

[0041] By establishing a diagnostic function link, which includes multiple functional nodes, the entire test environment can be tested to ensure the normal operation of the vehicle test; and the connection status between adjacent functional nodes and the connection status between non-adjacent functional nodes can be determined through power supply relationships, communication relationships, and signal relationships, thereby improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0043] Figure 1 It is a structural schematic diagram of a vehicle offline detection system provided in an embodiment of the present application;

[0044] Figure 2 It is a flow chart of a vehicle offline detection method provided in an embodiment of the present application;

[0045] Figure 3 yes Figure 2 A detailed flowchart of step S201 in FIG.

[0046] Figure 4 yes Figure 2 A detailed flowchart of step S202 in FIG.

[0047] Figure 5 is a schematic diagram of a diagnostic function link provided by an embodiment of the present application;

[0048] Figure 6 It is a flowchart of a link state management provided by an embodiment of the present application;

[0049] Figure 7 It is a structural schematic diagram of another vehicle offline detection system provided in an embodiment of the present application;

[0050] Figure 8 It is a flow chart of another offline detection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0053] In the embodiments of the present application, the diagnostic equipment includes a battery tester, a diagnostic instrument, a smart phone, a PDA (Personal Digital Assistant), a tablet computer, a smart watch, and other electronic devices that can detect a car.

[0054] Specifically, the embodiments of the present application are described in detail below in conjunction with the drawings in the specification.

[0055] See also Figure 1 , Figure 1 is a schematic diagram of a vehicle detection system provided in an embodiment of the present application;

[0056] like Figure 1 As shown, the vehicle offline detection system 100 includes: a diagnostic device 10 , a vehicle connection device 20 , a component connection device 30 and an electronic control unit 40 .

[0057] The diagnostic device 10 is used to diagnose whether the status of various components of the vehicle is normal. The vehicle can be a motor vehicle of any model, such as a truck, a car, a bus, etc.

[0058] The vehicle connection device 20 , namely (Vehicle Communication Interface, VCI), is connected to the diagnostic device 10 and the component connection device 30 , and is used to connect to the component connection device 30 to forward the diagnostic command sent by the diagnostic device 10 .

[0059] In the embodiment of the present application, the vehicle connection device 20 is also used to connect to the entire vehicle so that the diagnostic device 10 can directly diagnose the status of the vehicle components. The vehicle connection device 20 is connected to the component connection device 30 or the vehicle through a hardware communication interface, and the hardware communication interface includes an OBD interface.

[0060] Among them, the component connection device 30, namely (Peripheral component interconnect, PCI), is connected to the electronic control unit 40 to simulate the whole vehicle environment function, for example: providing a standard OBDII connection method for the vehicle connection device 20, providing a 12V low-voltage power supply, an internal communication bus and various control signals for the electronic control unit 40, or providing an ignition switch signal to the electronic control unit 40, or simulating the resistance on the interlock loop, or the gateway sending a link activation message to the electronic control unit 40 and other functions.

[0061] In an embodiment of the present application, the vehicle has an electronic control system composed of multiple electronic control units 40, which is used to coordinate and control the vehicle according to the operating instructions of the driver, etc., and to monitor one or more vehicle parameters in real time to ensure reliable and safe operation of the vehicle.

[0062] It is understandable that in vehicles of different models or types, the electronic control units they have are different due to differences in their structural settings and functions, resulting in different lists of electronic control units.

[0063] Among them, each electronic control unit 40 in the vehicle is usually connected to each other by bus. Each electronic control unit 40 uses a specific communication protocol. The electronic control unit 40 communicates on the corresponding vehicle bus according to the communication protocol used by itself to avoid conflicts and improve efficiency. That is, the electronic control units 40 using the same communication protocol communicate on a vehicle bus, and a vehicle bus corresponds to a communication protocol.

[0064] In order to facilitate daily inspection and maintenance, the vehicle may also have at least one hardware communication interface, such as an OBD interface. The hardware communication interface and the vehicle may be connected to one or more vehicle buses to establish a communication connection with an external device, so that it can complete data exchange with the electronic control unit and other processes.

[0065] The diagnostic device 10 includes a battery tester and a diagnostic instrument. The battery tester can be any type of vehicle diagnostic product. The battery tester generally measures the electrical characteristics of the vehicle battery and the starting system, and judges the quality of the battery and the starting system according to the changes in the electrical characteristics. Specifically, the battery tester includes at least one electrical connector, the end of which is a diagnostic connector that matches the hardware communication interface of the vehicle 10. The electrical connector includes a Kelvin connector, a low-frequency circular connector, an optical fiber connector, a rectangular connector, a printed circuit connector, a radio frequency connector, and other connectors. Preferably, the electrical connector in the embodiment of the present application is a Kelvin connector.

[0066] The diagnostic equipment communicates with the electronic control unit (ECU) through the vehicle connection device to obtain the status of the vehicle components to assist in fault repair. For example, the diagnostic equipment interacts with the electronic control unit through the DLC connector to obtain the battery status, including the battery load status. The electronic control unit is used to control multiple components of the vehicle, such as the engine, gearbox, windows, doors, dashboard and other components.

[0067] In actual use, the diagnostic device 10 establishes a physical communication connection with various vehicle buses in the vehicle through an interface module, such as a diagnostic connector and a hardware communication interface, and loads a suitable or paired protocol configuration to realize data interaction with the electronic control system, such as sending detection instructions or receiving detection data.

[0068] In the embodiment of the present application, the vehicle also includes tires, a steering wheel, a drive motor and other components, which belong to the prior art and will not be described in detail here.

[0069] See also Figure 2 , Figure 2 It is a flow chart of a vehicle offline detection method provided in an embodiment of the present application;

[0070] The offline detection method of the vehicle is applied to the offline detection system of the vehicle mentioned in the above embodiment.

[0071] like Figure 2 As shown, the process of the vehicle offline detection method includes:

[0072] Step S201: Establishing a diagnostic function link, wherein the diagnostic function link includes a plurality of function nodes, and the function nodes include a diagnostic device, a vehicle connection device, a component connection device, and an electronic control unit, wherein the diagnostic device is connected to the vehicle connection device, the vehicle connection device is connected to the component connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the whole vehicle environment of the vehicle;

[0073] For details, please refer to Figure 3 , Figure 3 yes Figure 2 A detailed flowchart of step S201 in FIG.

[0074] like Figure 3 As shown, the steps of establishing a diagnostic function link include:

[0075] Step S301: the diagnostic device sends a link establishment message to the vehicle connection device to establish a link between the diagnostic device and the vehicle connection device;

[0076] Specifically, the diagnostic device sends a link establishment request to the vehicle connection device, and the link establishment request is represented in the form of a link establishment message. After the vehicle connection device receives the link establishment message sent by the diagnostic device, it performs link status management and establishes a link between the diagnostic device and the vehicle connection device.

[0077] In the embodiment of the present application, establishing a diagnostic function link also includes:

[0078] After the diagnostic device establishes a link with the vehicle connection device, the diagnostic device and the vehicle connection device establish a heartbeat detection mechanism.

[0079] Specifically, the diagnostic device and the car connection device establish a heartbeat detection mechanism, the diagnostic device receives a heartbeat signal or a heartbeat response signal sent by the car connection device at a preset time interval, and the car connection device receives a heartbeat signal or a heartbeat response signal sent by the diagnostic device at a preset time interval. It can be understood that the preset time can be set according to specific needs, for example: set to 1s, 2s, and is not limited here.

[0080] Step S302: the vehicle connection device forwards a link establishment message to the component connection device to establish a link between the vehicle connection device and the component connection device;

[0081] Specifically, after the vehicle connection device receives the link establishment message sent by the diagnostic device, it forwards the link establishment message to the component connection device. After the component connection device receives the link establishment message sent by the vehicle connection device, it performs link status management and establishes a link between the component connection device and the vehicle connection device.

[0082] Step S303: the diagnostic device sends a start command to the vehicle connection device, which forwards the start command to the component connection device, so that the component connection device starts the electronic control unit after receiving the start command to establish a link between the component connection device and the electronic control unit.

[0083] Specifically, the diagnostic device sends a start command to the vehicle connection device, and the start command is used to start the electronic control unit. After the vehicle connection device receives the start command sent by the diagnostic device, it forwards the start command to the component connection device, so that the component connection device parses and executes the start command, for example: powering on the electronic control unit, and sending the start command to the electronic control unit to start the electronic control unit, and establish a link between the component connection device and the electronic control unit.

[0084] In an embodiment of the present application, there may be multiple electronic control units, and multiple electronic control units constitute an electronic control system. The component connection device simulates the function of the entire vehicle, thereby achieving connection with each electronic control unit to obtain the diagnostic measurement results of each electronic control unit, and the diagnostic measurement results include at least one of a fault code, a battery load status, a current battery mileage, and a previous battery mileage.

[0085] Step S202: if there is a power supply relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent functional nodes is determined according to the communication relationship and / or signal relationship;

[0086] The relationship between adjacent nodes is shown in Table 1 below:

[0087]

[0088] Table 1

[0089] It can be seen that there is a power supply relationship between the component connection device and the vehicle connection device and the electronic control unit, and the component connection device supplies power to the vehicle connection device and the electronic control unit.

[0090] Furthermore, if the diagnostic device is connected to the vehicle connection device via a wired manner, for example, via a USB wired connection, a power supply relationship exists between the diagnostic device and the vehicle connection device, and the diagnostic device determines the connection status of the vehicle connection device via the power supply relationship.

[0091] For details, please refer to Figure 4 , Figure 4 yes Figure 2 A detailed flowchart of step S202 in FIG.

[0092] like Figure 4 As shown, the process of determining the connection status of adjacent functional nodes according to the communication relationship and / or signal relationship includes:

[0093] Step S2021: Determine whether there is a communication relationship between adjacent functional nodes;

[0094] Specifically, the communication relationship refers to a digital signal. For example, if a message sent by the other party is received, it means that the communication is normal, and if a message sent by the other party is not received, it means that the connection is disconnected.

[0095] It is understandable that the disconnection may be caused by a physical line disconnection, or the other party's software is abnormal and no message is sent. In other words, if there is no communication relationship between adjacent functional nodes, it may be a hardware abnormality or a software abnormality.

[0096] Step S2022: determining the connection status of the adjacent functional nodes according to the communication response status;

[0097] Specifically, if there is a communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the communication response status. For example: the diagnostic device sends a message to the car connection device, and the connection status of the car connection device is determined according to whether the car connection device feeds back the message; similarly, the car connection device sends a message to the component connection device, and the connection status of the component connection device is determined according to whether the component connection device feeds back the message; similarly, the component connection device sends a message to the electronic control unit, and the connection status of the electronic control unit is determined according to whether the electronic control unit feeds back the message.

[0098] It is understandable that the electronic control unit, component connection device, and vehicle connection device can also send messages to adjacent functional nodes and determine the connection status of the recipient based on whether the recipient feeds back the message, which will not be elaborated here.

[0099] Step S2023: determining the connection status of adjacent functional nodes according to the signal relationship, wherein the signal relationship includes a level signal and / or a heartbeat signal;

[0100] Specifically, if there is no communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to a signal relationship, wherein the signal relationship includes a level signal and / or a heartbeat signal.

[0101] In the embodiment of the present application, the signal relationship includes a heartbeat signal, and the connection status of the adjacent functional nodes is determined according to the signal relationship, including:

[0102] If a heartbeat detection mechanism is established between an application of a certain functional node and an adjacent functional node, and no heartbeat response signal sent by the adjacent functional node is received within a preset time, it is determined that a link break anomaly exists between the adjacent functional nodes.

[0103] For example, the component connection device supplies power to the car connection device through the OBDPIN16 pin, and the car connection device sends a level signal to the component connection device through the OBDPIN3 pin. The component connection device detects the connection status with the car connection device by the level signal.

[0104] Alternatively, a heartbeat detection mechanism is established between the diagnostic device and the vehicle connection device, and the diagnostic device and the vehicle connection device can determine the connection status between the two through a heartbeat signal.

[0105] In the embodiment of the present application, when the car connection device is connected to the component connection device, the level of the OBD PIN3 pin is pulled high, and the component connection device can confirm whether there is a physical connection with the car connection device by detecting the level of the OBD PIN3 pin. If the connection between the car connection device and the component connection device is disconnected, the level of the OBD PIN3 pin is pulled low, and the component connection device can confirm that the car connection device has been disconnected.

[0106] In an embodiment of the present application, link status detection between adjacent nodes includes:

[0107] If there is a power supply relationship between adjacent nodes, the connection status can be determined based on the power supply relationship first;

[0108] When the connection status cannot be determined from the power supply relationship, the connection status can be determined from the communication response status; if there is an interactive signal between two adjacent devices, the interactive signal can be detected to determine the connection status; for software-level anomalies, the connection status can be determined from the heartbeat detection mechanism. The details are as follows:

[0109] (1) Between the diagnostic device and the car connection device: In a non-USB connection relationship, there is no power supply relationship. In a wireless connection, there is no direct signal connection, but there is a communication connection. The connection status can be determined from the communication connection. If there is no connection in any communication mode such as WiFi, BT, USB, Ethernet, etc., the diagnostic device and the car connection device can determine that the other party has been disconnected. Under normal communication conditions, the heartbeat mechanism can be used to determine whether the software is abnormal. Before sending diagnostic commands, the diagnostic application first establishes a heartbeat monitoring mechanism with the car connection device and notifies the car connection device to perform heartbeat monitoring. The diagnostic application sends a heartbeat message to the car connection device every 1 second, and the car connection device gives a heartbeat response after receiving the heartbeat message. If the car connection device does not receive the heartbeat message from the diagnostic device within 10 consecutive seconds, the car connection device enters the link disconnection exception handling process; similarly, if the diagnostic application has no heartbeat response within 10 consecutive seconds, it also detects the link disconnection exception and enters the exception handling process.

[0110] (2) Between the vehicle connection device and the component connection device, the component connection device supplies power to the vehicle connection device through OBD PIN16, and the vehicle connection device can monitor the power status of OBD PIN16 to determine the connection status of the component connection device; the vehicle connection device can send a signal to the component connection device through OBD PIN3, and the component connection device determines the connection status with the vehicle connection device through signal detection. In this scheme, when VCI receives a link establishment message from the diagnostic device, it indicates that the component connection device needs to be connected, and OBD PIN3 is set to a high level. The component connection device detects OBD PIN3 to determine its connection status with the vehicle connection device. If OBD PIN3 is at a high level, it means that the component connection device is normally connected to the vehicle connection device. Otherwise, it is determined that the vehicle connection device is not connected or the component test is not started.

[0111] (3) Between the component connection device and the electronic control unit, the component connection device supplies power to the electronic control unit. If the component connection device is disconnected from the electronic control unit, the electronic control unit stops running, which is equivalent to detecting that the component connection device is disconnected. Since the component connection device cannot determine the connection status of the electronic control unit from the power supply status and communication status, other mechanisms are required to determine the connection status, for example: determining the connection status between the component connection device and the electronic control unit through the heartbeat detection mechanism established between the component connection device and the electronic control unit.

[0112] Step S203: Among non-adjacent functional nodes, a functional node determines the connection status of non-adjacent functional nodes through the power supply voltage fed back from the adjacent functional node; or, a functional node determines the connection status of non-adjacent functional nodes through the response and / or abnormal signal of the diagnostic command.

[0113] Specifically, the diagnostic device and the component connection device are non-adjacent functional nodes. The diagnostic device determines the connection status of the component connection device by querying the power supply voltage from the vehicle connection device. For example, the diagnostic device requests the vehicle connection device to feedback the voltage of the OBD PIN16 pin. If the voltage of the OBD PIN16 pin of the vehicle connection device is a high voltage, it is determined that the component connection device is connected normally; if the voltage of the OBD PIN16 pin of the vehicle connection device is a low voltage, it is determined that the component connection device is abnormally connected. If the voltage value of the pin is higher than the preset voltage threshold, it is determined that the voltage of the pin is a high voltage; if the voltage value of the pin is lower than the preset voltage threshold, it is determined that the voltage of the pin is a low voltage.

[0114] Please refer to Figure 5 , Figure 5 is a schematic diagram of a diagnostic function link provided by an embodiment of the present application;

[0115] like Figure 5 As shown, the diagnostic function link consists of a diagnostic device, a vehicle connection device (Vehicle Communication Interface, VCI), a component connection device (Peripheral component interconnect, PCI) and an electronic control unit (Electronic Control Unit, ECU).

[0116] The diagnostic device and the car connection device support wireless connection, such as WiFi or BT; or the diagnostic device and the car connection device are connected by wire, such as USB or Ethernet, the car connection device and the component connection device are connected by a 16-pin OBD II wired cable, and the component connection device and the electronic control unit are connected by a dedicated wired cable, which includes: a 12V power supply, a ground wire, a communication wire, an interlock wire, an ignition switch signal, an airbag signal, etc. The component connection device can provide a 12V low-voltage power supply to power the electronic control unit and the car connection device.

[0117] Among them, the vehicle connection device, the component connection device and the electronic control unit communicate through a bus protocol. For example, the communication line of the vehicle connection device, including the CAN bus or the LIN bus, can be connected to the component connection device and pass through the component connection device to the electronic control unit. Therefore, the vehicle connection device can communicate directly with the component connection device and the electronic control unit.

[0118] In an embodiment of the present application, the diagnostic function is initiated from a diagnostic application on a diagnostic device. The diagnostic command passes through the diagnostic device, the vehicle connection device, the component connection device, and the electronic control unit and reaches the application on the electronic control unit. The test results are fed back to the diagnostic application of the diagnostic device through the same path.

[0119] It can be understood that at the physical layer, the vehicle connection device is responsible for the conversion of communication protocols. The diagnostic equipment and the vehicle connection device use communication protocols such as J2534, RP1210, and D-PDU to exchange data. The vehicle connection device communicates with the component connection device and the electronic control unit using bus protocols such as CAN and LIN.

[0120] In the embodiment of the present application, the link status detection between non-adjacent nodes includes: a functional node determines the connection status of a non-adjacent functional node through the power supply voltage fed back by the adjacent functional node; or a functional node determines the connection status of a non-adjacent functional node through the response and / or abnormal signal of the diagnostic command. The link status detection between non-adjacent nodes is specifically shown in Table 2 below:

[0121]

[0122]

[0123] Table 2

[0124] (1) Cross-node link detection of diagnostic equipment:

[0125] The diagnostic device requests the vehicle connection device to feedback the power status of OBD PIN16. The voltage of OBD PIN16 can be used to determine whether the component connection device is connected normally. If the voltage of OBD PIN16 of the vehicle connection device is high, the component connection device is connected normally, otherwise the component connection device is disconnected.

[0126] The diagnostic device can determine whether the electronic control unit is connected normally through the response to the diagnostic command. If no response to the diagnostic command of the electronic control unit is received, the electronic control unit is offline, that is, the link is broken, for example: the electronic control unit is unplugged or the software is abnormal.

[0127] It is understandable that the diagnostic device first determines the connection of the component connection device, and then determines the connection of the electronic control unit. Since the component connection device supplies power to the electronic control unit, if the component connection device is abnormally connected, the electronic control unit must be abnormally connected.

[0128] (2) Cross-node link detection of automotive connection devices:

[0129] The car connection device obtains the abnormality of the electronic control unit link through abnormal notification. When the diagnostic device detects that the electronic control unit link is disconnected, it enters the abnormality processing and sends a message to notify the car connection device to remove the link. After the car connection device is informed of the abnormality of the link, it enters the abnormality protection processing.

[0130] (3) Cross-node link detection of component connection equipment:

[0131] When the car connection device is notified of the abnormality of the diagnostic device link, it enters abnormal protection processing and pulls down the electrical signal of the OBD PIN3 pin. After the component connection device detects the low level of OBD PIN3, it is also notified of the abnormality of the link and enters abnormal protection.

[0132] (4) Cross-node link detection of electronic control units:

[0133] When the component connection device detects a link abnormality, it enters abnormal protection processing, turns off the power of the electronic control unit, and the electronic control unit stops running.

[0134] In an embodiment of the present application, the diagnostic device sends a diagnostic command to the vehicle connection device, the vehicle connection device forwards the diagnostic command to the component connection device, and the component connection device forwards the diagnostic command to the electronic control unit to obtain the diagnostic result of the electronic control unit.

[0135] Alternatively, since the vehicle connection device, the component connection device and the electronic control unit are communicatively connected via the same bus, after receiving the diagnosis command sent by the diagnosis device, the vehicle connection device directly forwards the diagnosis command to the electronic control unit.

[0136] Since the diagnostic command of the diagnostic device is directly transmitted from the vehicle connection device to the electronic control unit through the component connection device without the participation of the software of the component connection device, there is no need to determine whether the software of the component connection device is abnormal during link status detection.

[0137] In the embodiment of the present application, each functional node on the diagnostic function link is installed with an application program, such as Figure 5 As shown, the diagnostic device corresponds to a diagnostic application, the vehicle connection device corresponds to an application, the component connection device corresponds to an application, and the electronic control unit corresponds to an application.

[0138] The method further includes:

[0139] The diagnostic application of the diagnostic device sends a diagnostic command to the application of the vehicle connection device, which forwards the diagnostic command to the application of the component connection device, and the application of the component connection device forwards the command to the application of the electronic control unit to obtain the test result of the electronic control unit.

[0140] Since the vehicle connection device, the component connection device and the electronic control unit are communicatively connected via the same bus, the diagnostic application of the diagnostic device sends a diagnostic command to the application of the vehicle connection device. After receiving the diagnostic command, the application of the vehicle connection device directly forwards the diagnostic command to the application of the electronic control unit to obtain the test result of the electronic control unit, thereby reducing the forwarding process of the component connection device and improving the response speed.

[0141] The offline detection method for a vehicle provided in the embodiment of the present application can improve the detection efficiency by comprehensively adopting methods such as power supply monitoring, connection signal monitoring, communication identification, and heartbeat detection according to the characteristics of each functional node on the diagnostic function link, identifying the abnormality of any functional node on the diagnostic function link, and performing abnormal processing and protection; and all nodes can be monitored to ensure the integrity of the link; detection is performed from aspects such as power supply, signal, and communication, with high detection efficiency; a combination of independent detection, active detection, and passive notification methods is adopted, with fast recognition speed, few dependent conditions, high recognition accuracy, and simple implementation and deployment.

[0142] In the embodiment of the present application, since link detection may be abnormal, link status management is required. Please refer to Figure 6 , Figure 6 It is a flowchart of a link state management provided by an embodiment of the present application;

[0143] The link status management process includes link establishment, heartbeat detection establishment, electronic control unit startup, electronic control unit diagnosis, electronic control unit shutdown after diagnosis, link shutdown and other processes.

[0144] Specifically, Figure 6 As shown in the figure, the link state management process includes:

[0145] Step S601: the diagnostic device sends a link establishment message to the vehicle connection device;

[0146] Specifically, the diagnostic device sends a link establishment request to the vehicle connection device, and the link establishment request is represented in the form of a link establishment message. After the vehicle connection device receives the link establishment message sent by the diagnostic device, it performs link status management and establishes a link between the diagnostic device and the vehicle connection device.

[0147] Step S602: the vehicle connection device sends a link establishment message to the component connection device;

[0148] Specifically, after the vehicle connection device receives the link establishment message sent by the diagnostic device, it forwards the link establishment message to the component connection device. After the component connection device receives the link establishment message sent by the vehicle connection device, it performs link status management and establishes a link between the component connection device and the vehicle connection device.

[0149] Step S603: establishing a heartbeat detection mechanism between the diagnostic device and the vehicle connection device;

[0150] Specifically, the diagnostic device and the car connection device establish a heartbeat detection mechanism, the diagnostic device receives a heartbeat signal or a heartbeat response signal sent by the car connection device at a preset time interval, and the car connection device receives a heartbeat signal or a heartbeat response signal sent by the diagnostic device at a preset time interval. It can be understood that the preset time can be set according to specific needs, for example: set to 1s, 2s, and is not limited here.

[0151] Step S604: the vehicle connection device pulls up the level of a certain pin;

[0152] Specifically, the car connection device pulls up the level of the OBD PIN3 pin, that is, makes the level of the OBD PIN3 pin high.

[0153] Step S605: the component connection device detects the level state of a certain pin;

[0154] Specifically, the vehicle connection device and the component connection device are connected via an OBD interface, for example, OBD PIN 3. The embodiment of the present application may also define other pins for detection, which are not limited here.

[0155] It is understandable that the OBD standard has 16 PIN pins, and this application customizes the use of OBD PIN3 pin for signal interaction; the software always runs a task, and an analog-to-digital converter (ADC) is connected to the OBD PIN3 pin to sample the voltage of the OBD PIN3 pin; the connection status between the two devices is determined by the sampled voltage.

[0156] Step S606: the diagnostic device sends a start command to the vehicle connection device;

[0157] Specifically, the start command is used to start the electronic control unit.

[0158] Step S607: the vehicle connection device sends a start command to the component connection device;

[0159] Step S608: the component connection device sends a start command to the electronic control unit;

[0160] Step S609: the electronic control unit starts running;

[0161] Step S610: the diagnostic device sends a diagnostic command to the vehicle connection device;

[0162] Specifically, the diagnostic command is used to diagnose the electronic control unit.

[0163] Step S611: the vehicle connection device sends a diagnostic command to the electronic control unit;

[0164] Step S612: the electronic control unit feeds back the execution result of the diagnostic command;

[0165] Specifically, the execution result of the diagnostic command, that is, the diagnostic measurement result of the electronic control unit, includes at least one of a fault code, a battery load status, a current battery mileage, and a previous battery mileage. The electronic control unit sends the diagnostic measurement result to the vehicle connection device and / or the component connection device, so that the vehicle connection device forwards the diagnostic measurement result to the diagnostic device.

[0166] Step S613: the diagnostic device sends a shutdown command to the vehicle connection device;

[0167] Step S614: the vehicle connection device forwards a closing command to the component connection device;

[0168] Step S615: the component connection device forwards a shutdown command to the electronic control unit;

[0169] Step S616: the electronic control unit shuts down;

[0170] Step S617: the diagnostic device sends a stop detection command to the vehicle connection device;

[0171] Step S618: the car connection device stops heartbeat detection and pulls down the level of a certain pin;

[0172] Specifically, the car connection device stops the heartbeat detection with the diagnostic device and pulls down the level of the OBD PIN3 pin.

[0173] Step S619: the component connection device stops detecting the level state of a certain pin.

[0174] Specifically, the component connection device stops detecting the level state of the OBD PIN3 pin.

[0175] The link state management process is shown in Table 3 below:

[0176]

[0177]

[0178] Table 3

[0179] As shown in Table 3 above, under normal execution flow, the diagnostic device will actively remove the link after the diagnosis is completed. If an abnormality occurs on the link, abnormality detection and link removal are required, and each functional node is restored to the default state. The abnormality detection method of each functional node is shown in Table 4 below:

[0180]

[0181]

[0182] Table 4

[0183] For details, please refer to Figure 7 , Figure 7 It is a structural schematic diagram of another vehicle offline detection system provided in an embodiment of the present application;

[0184] like Figure 7 As shown, the car connection device 20 can be connected to the component connection device 30 or to the whole vehicle 200. When the component connection device 30 is connected for diagnosis, the level of the OBD PIN3 pin will be changed. When the whole vehicle 200 is connected to the car, the signal of the OBD PIN3 pin cannot be changed at will to prevent interference to the car. After the connection between the car connection device 20 and the component connection device 30 in the embodiment of the present application is initiated, the car connection device 20 has clearly been connected to the component connection device 30, and only then will the level of the OBD PIN3 pin be raised. After the test is completed, this signal needs to be restored, that is, the level of the OBD PIN3 pin needs to be lowered.

[0185] In an embodiment of the present application, if it is identified that the vehicle connection device is connected to the entire vehicle of the vehicle, the link between the vehicle connection device and the component connection device is disconnected to obtain information about the vehicle components through the vehicle connection device.

[0186] For details, please refer to Figure 8 , Figure 8 It is a flow chart of another offline detection method provided in an embodiment of the present application;

[0187] like Figure 8 As shown, the process of the offline detection method includes:

[0188] Step S801: Establishing a diagnostic function link;

[0189] Step S802: Whether the vehicle connection device is connected to the entire vehicle;

[0190] Specifically, the application of the car connection device automatically identifies whether the connected device is a complete vehicle of the car or a component connection device. If it is connected to the complete vehicle of the car, it proceeds to step S803; if it is not connected to the complete vehicle of the car, it proceeds to step S805.

[0191] Step S803: disconnecting the link between the vehicle connection device and the component connection device, and switching to the vehicle connection mode;

[0192] Specifically, if the car connection device is connected to the entire vehicle, the link between the car connection device and the component connection device is disconnected, and the mode is switched to the car connection mode to directly obtain information about the car components through the car connection device to prevent the component connection device from interfering with the car.

[0193] Step S804: obtaining information about vehicle components through the vehicle connection device;

[0194] Step S805: Perform detection through the diagnostic function link.

[0195] Specifically, if the vehicle connection device is not connected to the entire vehicle, the electronic control unit is detected through a diagnostic function link.

[0196] By determining whether the vehicle connection device is connected to the entire vehicle, different processing logics can be implemented, and diagnostic equipment and vehicle connection devices can be reused, reducing the investment cost of equipment and achieving work in multiple scenarios.

[0197] In addition, this application adopts a unified detection framework to support various abnormal scenarios, including hardware link abnormalities and software abnormalities, such as device removal, connection abnormalities, power outages, software crashes, test business exits, etc., which can improve the stability of the system and ensure the normal operation of vehicle testing.

[0198] In an embodiment of the present application, a vehicle offline detection method is provided, the method comprising: establishing a diagnostic function link, wherein the diagnostic function link comprises a plurality of functional nodes, the functional nodes comprising a diagnostic device, a vehicle connection device, a component connection device and an electronic control unit, wherein the diagnostic device is connected to the vehicle connection device, the vehicle connection device is connected to the component connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the whole vehicle environment of the vehicle; between adjacent functional nodes, if there is a power supply relationship, the connection status of the adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent functional nodes is determined according to the communication relationship and / or the signal relationship; between non-adjacent functional nodes, a functional node determines the connection status of a non-adjacent functional node through the power supply voltage fed back by the adjacent functional node; or, a functional node determines the connection status of a non-adjacent functional node through the response and / or abnormal signal of the diagnostic command.

[0199] By establishing a diagnostic function link, which includes multiple functional nodes, the entire test environment can be tested to ensure the normal operation of the vehicle test; and the connection status between adjacent functional nodes and the connection status between non-adjacent functional nodes can be determined through power supply relationships, communication relationships, and signal relationships, thereby improving detection efficiency.

[0200] The diagnostic device of the embodiment of the present application exists in various forms, including but not limited to:

[0201] (1) Battery tester refers to an instrument that can quickly test lithium-ion batteries, nickel-metal hydride batteries, polymer batteries and other types of batteries (groups). For example: mobile phone battery tester, walkie-talkie battery tester, notebook battery tester, etc., which are widely used in production line testing of various battery manufacturers. Common battery testers include: battery voltage internal resistance tester, finished battery comprehensive tester, battery capacity tester, lithium battery protection board tester, battery voltage sorter.

[0202] (2) Diagnostic instruments, including automobile fault diagnostic instruments. Automobile fault diagnostic instruments are vehicle fault self-checking terminals. Automobile fault diagnostic instruments (also known as automobile decoders) are portable intelligent automobile fault self-checking instruments used to detect automobile faults. Users can use them to quickly read faults in the automobile electronic control system and display fault information on a liquid crystal display screen to quickly identify the location and cause of the fault.

[0203] (3) Mobile communication equipment: This type of equipment is characterized by having mobile communication functions and its main goal is to provide voice and data communications. This type of testing equipment includes: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0204] (4) Mobile personal computer devices: These devices belong to the category of personal computers, have computing and processing functions, and generally also have mobile Internet access features. This type of testing equipment includes: PDA, MID and UMPC devices, such as iPad.

[0205] (5) Portable entertainment devices: These devices can display and play video content and generally have mobile Internet access. These devices include video players, handheld game consoles, smart toys, and portable car navigation devices.

[0206] (6) Other electronic devices with video playback and Internet access functions.

[0207] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by one or more processors, each process of the above-mentioned vehicle offline detection method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. Among them, the computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0208] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0209] The above-described device or equipment embodiments are merely illustrative, wherein the unit modules described as separate components may or may not be physically separated, and the components displayed as module units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network module units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0210] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal (which can be a mobile terminal, a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment of the present application or some parts of the embodiments.

[0211] Finally, it should be noted that the embodiments described above in conjunction with the accompanying drawings are only used to illustrate the technical solutions of the present application. The present application is not limited to the above-mentioned specific implementation methods, which are merely illustrative and not restrictive. Under the idea of ​​the present application, the technical features in the above-mentioned embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above-mentioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle offline detection method, characterized in that: The method comprises: Establishing a diagnostic function link, wherein the diagnostic function link includes a plurality of function nodes, and the function nodes include a diagnostic device, a vehicle connection device, a component connection device, and an electronic control unit, wherein the diagnostic device is connected to the vehicle connection device, the vehicle connection device is connected to the component connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the whole vehicle environment of the vehicle; If there is a power supply relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent functional nodes is determined according to the communication relationship and / or signal relationship; Between non-adjacent functional nodes, a certain functional node determines the connection status of a non-adjacent functional node through the power supply voltage fed back by the adjacent functional node; or a certain functional node determines the connection status of a non-adjacent functional node through the response and / or abnormal signal of the diagnostic command; The determining the connection status of adjacent functional nodes according to the communication relationship and / or the signal relationship includes: If there is a communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the communication response status; If there is no communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the signal relationship, wherein the signal relationship includes a level signal and / or a heartbeat signal.

2. The method according to claim 1, characterized in that The step of establishing a diagnostic function link comprises: The diagnostic device sends a link establishment message to the vehicle connection device to establish a link between the diagnostic device and the vehicle connection device; The vehicle connection device forwards the link establishment message to the component connection device to establish a link between the vehicle connection device and the component connection device; The diagnostic device sends a start command to the vehicle connection device, and the vehicle connection device forwards the start command to the component connection device, so that after receiving the start command, the component connection device starts the electronic control unit to establish a link between the component connection device and the electronic control unit.

3. The method according to claim 2, characterized in that The establishing of the diagnostic function link further includes: After the diagnostic device establishes a link with the vehicle connection device, the diagnostic device establishes a heartbeat detection mechanism with the vehicle connection device.

4. The method according to claim 1, characterized in that: The signal relationship includes a heartbeat signal, and determining the connection status of adjacent functional nodes according to the signal relationship includes: If a heartbeat detection mechanism is established between an application of a certain functional node and an adjacent functional node, and no heartbeat response signal sent by the adjacent functional node is received within a preset time, it is determined that a link break anomaly exists between the adjacent functional nodes.

5. The method according to claim 1, characterized in that The method further comprises: The diagnostic device sends a diagnostic command to the vehicle connection device, the vehicle connection device forwards the diagnostic command to the component connection device, and the component connection device forwards the diagnostic command to the electronic control unit to obtain the diagnostic result of the electronic control unit.

6. The method according to claim 5, characterized in that The vehicle connection device, the component connection device and the electronic control unit are communicatively connected via the same bus. After receiving the diagnosis command sent by the diagnosis device, the vehicle connection device directly forwards the diagnosis command to the electronic control unit.

7. The method according to claim 6, characterized in that Each functional node on the diagnostic function link is installed with an application program, and the method further comprises: The application of the diagnostic device sends a diagnostic command to the application of the vehicle connection device, and the application of the vehicle connection device forwards the diagnostic command to the application of the component connection device, which then forwards the command to the application of the electronic control unit to obtain the test result of the electronic control unit.

8. The method according to claim 1, characterized in that The method further comprises: If it is identified that the vehicle connection device is connected to the entire vehicle of the vehicle, the link between the vehicle connection device and the component connection device is disconnected to obtain information on the components of the vehicle through the vehicle connection device.

9. The method according to claim 1, characterized in that: The component connection device has a power supply relationship with the vehicle connection device and the electronic control unit, and the component connection device supplies power to the vehicle connection device and the electronic control unit.

10. The method according to claim 1, characterized in that If the diagnostic device is connected to the vehicle connection device via a wired manner, a power supply relationship exists between the diagnostic device and the vehicle connection device, and the diagnostic device determines the connection state of the vehicle connection device through the power supply relationship.

11. A vehicle offline detection system, characterized in that: The system comprises: a diagnostic function link, the diagnostic function link comprises: a diagnostic device, a vehicle connection device, a component connection device and an electronic control unit; wherein, A diagnostic device connected to a car connection device, and used to send a diagnostic command to the car connection device; between adjacent functional nodes, if there is a power supply relationship, the connection status of the adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of the adjacent functional nodes is determined according to the communication relationship and / or signal relationship; between non-adjacent functional nodes, a functional node determines the connection status of a non-adjacent functional node through the power supply voltage fed back by the adjacent functional node; or a functional node determines the connection status of a non-adjacent functional node through a response and / or an abnormal signal of a diagnostic command; the determination of the connection status of adjacent functional nodes according to the communication relationship and / or signal relationship includes: if there is a communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the communication response status; if there is no communication relationship between adjacent functional nodes, the connection status of the adjacent functional nodes is determined according to the signal relationship, wherein the signal relationship includes a level signal and / or a heartbeat signal; A vehicle connection device, connected to the diagnostic device, for receiving the diagnostic command and forwarding the diagnostic command to the electronic control unit; A component connection device, connected to the vehicle connection device, for simulating the whole vehicle environment of the vehicle; The electronic control unit is connected to the vehicle connection device and the component connection device, and is used to receive the diagnosis command and obtain the diagnosis result.

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