CN114995356A - Vehicle off-line detection method and system - Google Patents

Abstract

The embodiments of the present application relate to the technical field of automotive electronics, and disclose an off-line vehicle detection method and system. The detection method establishes a diagnostic function link including a plurality of functional nodes, so that the entire test environment can be tested. The detection ensures the normal operation of the vehicle test; and the connection state between adjacent functional nodes and the connection state between non-adjacent functional nodes can be determined through the power supply relationship, communication relationship and signal relationship, which can improve the detection efficiency.

Description

Off-line vehicle detection method and system

technical field

The present application relates to the technical field of automotive electronics, and in particular, to an offline detection method and system for vehicles.

Background technique

Due to the development of science and technology, there are more and more parts of the car. If any one of them has a problem, it may cause the car to fail to start or break down halfway. Therefore, the detection of the car becomes more and more important.

In the field of vehicle maintenance, diagnostic equipment is currently used to connect the car connection device, and the car is connected to the car through the car connection device to send diagnostic commands to the car to detect whether the status of each component in the car is normal, or to perform related action tests. Check whether each component is working properly.

However, in this way, the diagnostic equipment is used to connect the whole vehicle to judge online whether various parts of the vehicle are abnormal, but the test environment cannot be detected, which easily affects the normal execution of the test.

SUMMARY OF THE INVENTION

The embodiments of the present application aim to provide an offline vehicle detection method and system. By detecting the entire test environment, the normal operation of the vehicle test can be guaranteed, and the detection is performed from the aspects of power supply relationship, communication relationship and signal relationship. The detection efficiency can be improved.

In order to solve the above-mentioned technical problems, the embodiments of the present application provide the following technical solutions:

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

Establish a diagnostic function link, wherein the diagnostic function link includes a plurality of functional nodes, and the functional nodes include a diagnostic device, a car connection device, a component connection device, and an electronic control unit, wherein the diagnostic device is connected to the car connection device, and the car connection device is connected to components The connection device, the component connection device is connected to the electronic control unit, and the component connection device is used to simulate the vehicle environment of the car;

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 adjacent function nodes are determined according to the communication relationship and/or signal relationship. the connection status of the node;

Between non-adjacent functional nodes, a functional node determines the connection status of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes; / or abnormal signal, to determine the connection status of functional nodes that are not adjacent to it.

In some embodiments, establishing a diagnostic function link includes:

The diagnostic device sends a link establishment message to the car-connected device to establish a link between the diagnostic device and the car-connected device;

The car connection device forwards the link establishment message to the part connection device to establish a link between the car connection device and the part connection device;

The diagnostic device sends a start command to the car connection device, and the car connection device 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 connection between the component connection device and the electronic control unit. 's link.

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

After the diagnostic device establishes a link with the car connection device, the diagnosis device establishes a heartbeat detection mechanism with the car connection device.

In some embodiments, the connection status of adjacent functional nodes is determined according to the communication relationship and/or the signal relationship, including:

If there is a communication relationship between adjacent functional nodes, the connection state of the adjacent functional nodes is determined according to the communication response state;

If there is no communication relationship between adjacent functional nodes, the connection state 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.

In some embodiments, the signal relationship includes a heartbeat signal, and the connection status of adjacent functional nodes is determined according to the signal relationship, including:

If a heartbeat detection mechanism is established between the application program of a functional node and an adjacent functional node, and the heartbeat response signal sent by the adjacent functional node is not received within the preset time, it is determined that the adjacent functional node is between There is a broken chain exception.

In some embodiments, the method further includes:

The diagnosis device sends a diagnosis command to the car connection device, the car connection device forwards the diagnosis command to the component connection device, and the component connection device forwards the diagnosis command to the electronic control unit to obtain the diagnosis result of the electronic control unit.

In some embodiments, the car connection device, the component connection device and the electronic control unit are communicatively connected through the same bus, and the car connection device directly forwards the diagnosis command to the electronic control unit after receiving the diagnosis command sent by the diagnosis device.

In some embodiments, an application program is installed on each functional node on the diagnostic functional link, and the method further includes:

The application of the diagnostic device sends the diagnostic command to the application of the car-connected device, the application of the car-connected device forwards the diagnostic command to the application of the component-connected device, and the application of the component-connected device forwards it to the application of the electronic control unit, to obtain the test results of the electronic control unit.

In some embodiments, the method further includes:

If it is recognized 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, so as to obtain the information of the components of the vehicle through the vehicle connection device.

In some embodiments,

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.

In some embodiments,

If the diagnostic device and the vehicle connection device are connected in a wired manner, 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.

In a second aspect, an embodiment of the present application provides an offline detection system for a vehicle. The system includes: a diagnostic function link, where the diagnostic function link includes: a diagnosis device, a vehicle connection device, a component connection device, and an electronic control unit; wherein,

Diagnostic equipment, connected to the car connection device, used to send diagnostic commands to the car connection device;

The car is connected to the device, connected to the diagnostic device, used to receive the diagnostic command, and forward the diagnostic command to the electronic control unit;

Component connection device, connected to the car connection device, used to simulate the vehicle environment of the car;

The electronic control unit is connected to the vehicle connection device and the component connection device, and is used for receiving diagnosis commands and obtaining diagnosis results.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the above-mentioned offline vehicle detection method is implemented.

In a fourth aspect, embodiments of the present application provide 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 as described in the first aspect some or all of the steps. The computer program product may be a software installation package.

The beneficial effects of the embodiments of the present application are: different from the prior art, an offline vehicle detection method provided by the embodiments of the present application includes: establishing a diagnostic function link, wherein the diagnostic function link includes a plurality of Function node, the function node includes diagnostic equipment, vehicle connection equipment, component connection equipment and electronic control unit, wherein the diagnostic equipment is connected to the vehicle connection equipment, the vehicle connection equipment is connected to the component connection equipment, the component connection equipment is connected to the electronic control unit, and the component connection equipment is used for It is used to simulate the whole vehicle environment of the car; 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; Signal relationship to determine the connection state of adjacent functional nodes; between non-adjacent functional nodes, a functional node determines the connection state of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes ; Or, a certain function node determines the connection status of the function node not adjacent to it through the response of the diagnosis command and/or the abnormal signal.

By establishing a diagnostic function link, the diagnostic function link includes multiple functional nodes, so that the entire test environment can be tested to ensure the normal operation of the vehicle test; and the adjacent power supply relationship, communication relationship and signal relationship are determined. The connection state between functional nodes and the connection state between non-adjacent functional nodes can improve detection efficiency.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

1 is a schematic structural diagram of an offline detection system for a vehicle provided by an embodiment of the present application;

2 is a schematic flowchart of an offline detection method for a vehicle provided by an embodiment of the present application;

Fig. 3 is the refinement flow chart of step S201 in Fig. 2;

Fig. 4 is the refinement flow chart of step S202 in Fig. 2;

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

6 is a schematic flowchart of a link state management provided by an embodiment of the present application;

7 is a schematic structural diagram of another off-line vehicle detection system provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another offline detection method provided by an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

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

Specifically, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1, which is a schematic diagram of a vehicle detection system provided by an embodiment of the present application;

As shown in FIG. 1 , the off-line detection system 100 of the vehicle includes: a diagnostic device 10 , a car connection device 20 , a component connection device 30 and an electronic control unit 40 .

The diagnostic device 10 is used for diagnosing whether the state of each component of the vehicle is normal, and the vehicle may specifically be a motor vehicle of any model, such as a truck, a car, a bus, and the like.

The vehicle connection device 20 (Vehicle Communication Interface, VCI) is connected to the diagnosis device 10 and the component connection device 30 for connecting the component connection device 30 to forward the diagnosis command sent by the diagnosis device 10 .

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

Among them, the component connection device 30 (Peripheral component interconnect, PCI) is connected to the electronic control unit 40 for simulating the function of the whole vehicle environment, for example, the standard OBDII connection method is provided for the automobile connection device 20, and 12V low voltage is provided for the electronic control unit 40. Power supply, internal communication bus and various control signals, or provide ignition switch signal for electronic control unit 40, or simulate resistance on interlock loop, or gateway send link activation message to electronic control unit 40 and other functions.

In the embodiment of the present application, the vehicle has an electronic control system composed of a plurality of electronic control units 40 to coordinate and control the vehicle according to the operation instructions of the driver, etc., and to monitor one or more vehicle parameters in real time to ensure that the vehicle Reliable and safe operation.

It can be understood that, in different models or models of vehicles, the electronic control units are different according to the differences in their structural settings and assumed functions, resulting in different electronic control unit lists.

Wherein, the communication connection between the various electronic control units 40 in the vehicle is usually in the form of a bus. Each electronic control unit 40 uses a specific communication protocol. The electronic control unit 40 will communicate on the corresponding vehicle bus according to the communication protocol used by itself, so as to avoid conflicts and improve efficiency. That is, the electronic control units 40 using the same communication protocol communicate on one vehicle bus, and one vehicle bus corresponds to one communication protocol.

In order to facilitate routine 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 can be connected with one or more vehicle buses to establish a communication connection with an external device, so that it can complete processes such as data interaction with the electronic control unit.

The diagnostic device 10 includes a battery tester (BatteryTester) and a diagnostic device (Diagnostic). Among them, the battery tester can be any type of vehicle diagnostic product. The battery tester generally measures the electrical characteristics of the car battery and the starting system, and judges the quality of the battery and the starting system according to the changes in the electrical characteristics. Yes, the battery tester includes at least one electrical connector, the end of the electrical connector is a diagnostic connector matched with the hardware communication interface of the vehicle 10, and the electrical connector includes a Kelvin connector, a low-frequency circular connector, an optical fiber Connectors, rectangular connectors, printed circuit connectors, radio frequency connectors and other connectors, preferably, the electrical connectors in the embodiments of the present application are Kelvin connectors.

Among them, the diagnostic device communicates with the electronic control unit (ECU) through the car connection device, so as to obtain the status of the components on the vehicle to assist in troubleshooting. For example, the diagnostic device interacts with the electronic control unit through the DLC connector to Get the status of the battery, including the battery load status. Among them, the electronic control unit is used to control multiple components of the vehicle, such as: engine, gearbox, window, door, instrument panel and other components.

In actual use, the diagnostic device 10 establishes a physical communication connection with various automobile buses in the vehicle through interface modules, such as diagnostic connectors and hardware communication interfaces, and loads a suitable or paired protocol configuration to realize communication with the electronic control system. Data interaction between them, such as sending detection commands or receiving detection data.

In the embodiments of the present application, the vehicle further includes components such as tires, steering wheels, and drive motors, which belong to the prior art and will not be repeated here.

Please refer to FIG. 2, which is a schematic flowchart of an offline detection method for a vehicle provided by an embodiment of the present application;

Wherein, the offline detection method of the vehicle is applied to the offline detection system of the vehicle mentioned in the above embodiment.

As shown in Figure 2, the process of the offline detection method of the vehicle includes:

Step S201: Establish a diagnostic function link, wherein the diagnostic function link includes a plurality of functional nodes, and the functional 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, and the vehicle is connected to the The equipment is connected to the component connected to the equipment, the component connected equipment is connected to the electronic control unit, and the component connected equipment is used to simulate the vehicle environment of the car;

Specifically, please refer to FIG. 3 again, which is a detailed flowchart of step S201 in FIG. 2 ;

As shown in Figure 3, the steps of establishing a diagnostic function link include:

Step S301: the diagnosis device sends a link establishment message to the vehicle connection device to establish a link between the diagnosis device and the vehicle connection device;

Specifically, the diagnosis device sends a link establishment request to the car connection device, and the link establishment request is represented in the form of a link establishment message. After the car connection device receives the link establishment message sent by the diagnosis device, the link status Manage and establish a link between diagnostic equipment and connected equipment in the car.

In the embodiment of the present application, establishing a diagnostic function link further includes:

After the diagnostic device establishes a link with the car connection device, the diagnosis device establishes a heartbeat detection mechanism with the car connection device.

Specifically, the diagnostic device establishes a heartbeat detection mechanism with the car connection device, the diagnostic device receives the heartbeat signal or the heartbeat response signal sent by the car connection device at preset time intervals, and the car connection device receives the heartbeat signal or heartbeat response signal sent by the car connection device at preset time intervals. Heartbeat response signal. It can be understood that the preset time can be set according to specific needs, for example, set to 1s or 2s, which is not limited here.

Step S302: 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;

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. Road state management, and establish links between component connected devices and vehicle connected devices.

Step S303: The diagnosis device sends a start command to the car connection device, and the car connection device 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 the component connection device and the electronic control unit. link between units.

Specifically, the diagnostic device sends a start command to the vehicle connection device, where the start command is used to start the electronic control unit. After the car 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: power on the electronic control unit, and send the electronic control unit The activation command is sent to activate the electronic control unit and establish a link between the component connection device and the electronic control unit.

In the embodiment of the present application, there may be multiple electronic control units, and multiple electronic control units constitute an electronic control system, and the component connection device simulates the function of the whole vehicle, so as to realize the connection with each electronic control unit to obtain each electronic control unit. Diagnostic measurements of the unit, the diagnostic measurements including at least one of a fault code, battery load status, current battery usage mileage, and last battery usage mileage.

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 phase is determined according to the communication relationship and/or the signal relationship. The connection status of adjacent functional nodes;

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

Table 1

It can be seen 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.

Moreover, if the diagnostic device and the car connection device are connected by wire, for example, via USB wired connection, there is a power supply relationship between the diagnostic device and the car connection device, and the diagnostic device determines the connection state of the car connection device through the power supply relationship.

Specifically, please refer to FIG. 4 again, which is a detailed flowchart of step S202 in FIG. 2 ;

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

Step S2021: judging whether there is a communication relationship between adjacent functional nodes;

Specifically, the communication relationship refers to a digital signal. For example, receiving a message sent by the other party means that the communication is normal, and failing to receive a message sent by the other party means that the connection is disconnected.

It is understandable that the disconnection may be due to a disconnection on the physical line, or the other party's software is abnormal and no message is sent. That is to say, if there is no communication relationship between adjacent functional nodes, it may be a hardware abnormality. It could also be a software anomaly.

Step S2022: Determine the connection state of the adjacent functional nodes according to the communication response state;

Specifically, if there is a communication relationship between adjacent functional nodes, the connection state of the adjacent functional nodes is determined according to the communication response state. For example, the diagnosis 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, according to whether the component connection device feeds back the message. Determine the connection state of the component connection device; similarly, the component connection device sends a message to the electronic control unit, and determines the connection state of the electronic control unit according to whether the electronic control unit feeds back the message.

It can be understood that the electronic control unit, component connection device, and vehicle connection device can also send messages to adjacent functional nodes to determine the connection status of the receiver according to whether the receiver feeds back the message, which will not be repeated here.

Step S2023: Determine 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;

Specifically, 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.

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

If a heartbeat detection mechanism is established between the application program of a functional node and an adjacent functional node, and the heartbeat response signal sent by the adjacent functional node is not received within the preset time, it is determined that the adjacent functional node is between There is a broken chain exception.

For example, the component connecting device supplies power to the car connecting device through the OBDPIN16 pin, and the car connecting device sends a level signal to the component connecting device through the OBDPIN3 pin, and the component connecting device detects the connection with the car connecting device through the level of the signal. state.

Alternatively, a heartbeat detection mechanism is established between the diagnosis device and the car connection device, and the connection state between the diagnosis device and the car connection device can be determined through a heartbeat signal.

In the embodiment of the present application, the car connection device pulls up the level of the OBD PIN3 pin when connecting the component connection device, and the component connection device can confirm whether it exists with the car connection device by detecting the level of the OBD PIN3 pin. physical connection. If the connection between the car connection device and the part connection device is disconnected, the level of the OBD PIN3 pin is pulled low, and the part connection device can confirm that the car connection device has been disconnected.

In this embodiment of the present application, the link state detection between adjacent nodes includes:

If there is a power supply relationship between adjacent nodes, the connection status can be judged first from the power supply relationship;

When the connection status cannot be judged from the power supply relationship, the connection status can be judged from the communication response state; if there is an interactive signal between two adjacent devices, the interactive signal can be detected to judge the connection state; software-level abnormalities can be detected from the heartbeat. The mechanism determines the connection status. details as follows:

(1) Between the diagnostic device and the car connection device: In the non-USB connection relationship, there is no power supply relationship. In the case of wireless connection, there is no direct signal connection, but there is a communication connection, and the connection status can be judged from the communication connection. If any communication methods such as WiFi, BT, USB, Ethernet, etc. are not connected, the diagnostic device and the car connection device can determine each other that the other party has been disconnected. When the communication is normal, the heartbeat mechanism can be used to determine whether the software is abnormal. Before the diagnostic application sends the diagnostic command, the diagnostic application first establishes a heartbeat monitoring mechanism with the car-connected device, and notifies the car-connected device to perform heartbeat monitoring. The diagnostic application sends a heartbeat message to the car-connected device every 1 second, and the car-connected 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 does not receive a heartbeat response within 10 consecutive seconds, the link disconnection is also detected. Exception, enter the exception handling process.

(2) Between the car connection device and the part connection device, the part connection device supplies power to the car connection device through the OBD PIN16, and the car connection device can monitor the power status of the OBD PIN16 to determine the connection state of the part connection device; the car connection device can pass the OBD PIN16. PIN3 sends a signal to the component connection device, and the component connection device determines the connection state with the car connection device through signal detection. In this solution, when the VCI receives the link establishment message from the diagnostic device, it indicates that it needs to connect the component connection device, and sets the OBD PIN3 to a high level. The component connection device detects the OBD PIN3 to determine its connection status with the car connection device. If the OBD PIN3 is at a high level, it means that the component connection device is normally connected to the car connection device, otherwise, it is determined that the car connection device is not connected or the component test has not been started.

(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 judge the connection state of the electronic control unit from the power supply state and the communication state, other mechanisms are needed to judge the connection state, for example, the heartbeat detection mechanism established between the component connection device and the electronic control unit is used to determine the connection state between the two. connection status between.

Step S203: Between non-adjacent functional nodes, a certain functional node determines the connection state of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes; or, a certain functional node passes a diagnosis command Response and/or abnormal signal to determine the connection status of functional nodes that are not adjacent to it.

Specifically, the diagnostic device and the component connecting device are non-adjacent functional nodes. The diagnostic device determines the connection status of the component connecting device by inquiring the power supply voltage from the car connecting device. For example, the diagnostic device requests the car connecting device to feed back the OBD PIN16 pin If the voltage of the OBD PIN16 pin of the car connection device is high voltage, it is determined that the connection of the component connection device is normal; if the voltage of the OBD PIN16 pin of the car connection device is low voltage, it is determined that the connection of the component connection device is abnormal. Wherein, if the voltage value of the pin is higher than the preset voltage threshold, the voltage of the pin is determined to be a high voltage, and if the voltage value of the pin is lower than the preset voltage threshold, the voltage of the pin is determined to be a low voltage.

Please refer to FIG. 5 again, FIG. 5 is a schematic diagram of a diagnostic function link provided by an embodiment of the present application;

As shown in FIG. 5 , the diagnostic function link consists of a diagnostic device, a vehicle communication interface (VCI), a peripheral component interconnect (PCI) and an electronic control unit (ECU).

Among them, a wireless connection is supported between the diagnostic device and the car-connected device, such as WiFi or BT; or, a wired connection between the diagnostic device and the car-connected device, such as USB or Ethernet, is used between the car-connected device and the component-connected device. 16PIN OBD II wired cable connection, the component connection equipment and electronic control unit are connected by a special wired cable, the special wired cable includes: 12V power supply, ground wire, communication wire, interlock wire, ignition switch signal, safety Airbag signal and other cables. This component connection device can provide 12V low voltage power supply to power electronic control unit and car connection equipment.

Among them, the car connection device, the component connection device and the electronic control unit communicate through the bus protocol, for example: the communication line of the car connection device, including the CAN bus or LIN bus, can be connected to the component connection device and through the component connection device to connect to the electronic control unit, the car connection device is therefore able to communicate directly with the component connection device and the electronic control unit.

In the embodiment of the present application, the diagnosis function is initiated from the diagnosis application program on the diagnosis device, and the diagnosis command reaches the application program on the electronic control unit after the diagnosis device, the vehicle connection device, the component connection device, and the electronic control unit, and the test result passes through the same The path is fed back to the diagnostic application of the diagnostic device.

It can be understood that at the physical layer, the car connection device is responsible for the conversion of communication protocols, and the diagnostic equipment and the car connection device use J2534, RP1210, D-PDU and other communication protocols to exchange data. Communication between control units adopts CAN, LIN and other bus protocols.

In this embodiment of the present application, the link state detection between non-adjacent nodes includes: a certain functional node determines the connection state of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes; or , a certain function node determines the connection state of the function node that is not adjacent to it through the response of the diagnosis command and/or the abnormal signal. Link state detection between non-adjacent nodes, as shown in Table 2 below:

Table 2

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

The diagnostic device requests the car connection device to feed back the power status of the OBD PIN16, and it can be determined whether the component connection device is normally connected through the voltage of the OBD PIN16. If the OBDPIN16 voltage of the car connection device is high, the connection of the component connection device is normal; otherwise, the device connection of the component connection device is disconnected.

The diagnostic equipment can judge whether the electronic control unit is connected normally through the response of the diagnostic command. If no response to the diagnostic command from the electronic control unit is received, the electronic control unit is offline, that is, the link is disconnected. For example, the electronic control unit is pulled out. or software exception.

It can be understood that the diagnostic device firstly 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 connection of the component connection device is abnormal, the electronic control unit must be abnormally connected.

(2) Cross-node link detection of car connection equipment:

The car connection device informs the acquisition of the electronic control unit link abnormality through the abnormality. When the diagnostic device detects that the electronic control unit link is disconnected, it enters abnormal processing, and sends a message to notify the car connection device to remove the link. After the car connection device is notified that the link is abnormal, it enters abnormal protection processing.

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

When the car connection device is informed that the link of the diagnostic device is abnormal, it enters the abnormal protection process and pulls down the electrical signal of the OBD PIN3 pin. After the component connection device detects the low level of the OBD PIN3, it is also informed that the link is abnormal and enters the abnormal protection.

(4) Cross-node link detection of electronic control unit:

When the component connection device detects that the link is abnormal, it enters the abnormal protection process, turns off the power supply of the electronic control unit, and stops the operation of the electronic control unit.

In the embodiment of the present application, the diagnostic device sends a diagnostic command to the car connection device, the car 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.

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

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, it is not necessary to judge whether the software of the component connection device is abnormal during link status detection.

In the embodiment of the present application, an application program is installed on each functional node on the diagnostic function link. As shown in FIG. 5 , a diagnostic device corresponds to a diagnostic application program, an automobile connection device corresponds to an application program, and a component connection device corresponds to an application program. application, the electronic control unit corresponds to an application.

The method also includes:

The diagnostic application of the diagnostic device sends the diagnostic command to the application of the car connected device, the application of the car connected device forwards the diagnostic command to the application of the component connected device, and the application of the component connected device forwards it to the application of the electronic control unit , to obtain the test results of the electronic control unit.

Since the car-connected device, the component-connected device, and the electronic control unit are communicatively connected through the same bus, the diagnostic application of the diagnostic device sends a diagnostic command to the car-connected device's application, and after the car-connected device's application receives the diagnostic command , and directly forward the diagnostic command to the application program of the electronic control unit to obtain the test result of the electronic control unit, thereby reducing the forwarding process of the components connected to the device and improving the response speed.

The off-line vehicle detection method provided by the embodiment of the present application, by comprehensively adopting methods such as power supply monitoring, connection signal monitoring, communication identification, heartbeat detection, etc., according to the characteristics of each functional node on the diagnostic function link, to identify the faults on the diagnostic function link. Exception handling and protection of any functional node can improve the detection efficiency; moreover, all nodes can be monitored, and the integrity of the link is guaranteed; the detection from power supply, signal, communication, etc., has high detection efficiency; Using the combination of independent detection, active detection and passive notification, the recognition speed is fast, the dependency conditions are few, the recognition accuracy rate is high, and the implementation and deployment are simple.

In the embodiment of the present application, since the link detection may be abnormal, it is necessary to perform link state management, please refer to FIG. 6 again, and FIG. 6 is a schematic flowchart of a link state management provided by the embodiment of the present application;

Wherein, the management process of the link state includes the processes of link establishment, heartbeat detection establishment, electronic control unit startup, electronic control unit diagnosis, closing the electronic control unit after diagnosis, closing the link, and the like.

Specifically, as shown in Figure 6, the flow of link state management includes:

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

Specifically, the diagnosis device sends a link establishment request to the car connection device, and the link establishment request is represented in the form of a link establishment message. After the car connection device receives the link establishment message sent by the diagnosis device, the link status Manage and establish a link between diagnostic equipment and connected equipment in the car.

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

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. Road state management, and establish links between component connected devices and vehicle connected devices.

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

Specifically, the diagnostic device establishes a heartbeat detection mechanism with the car connection device, the diagnostic device receives the heartbeat signal or the heartbeat response signal sent by the car connection device at preset time intervals, and the car connection device receives the heartbeat signal or heartbeat response signal sent by the car connection device at preset time intervals. Heartbeat response signal. It can be understood that the preset time can be set according to specific needs, for example, set to 1s or 2s, which is not limited here.

Step S604: the car connection device pulls up the level of a certain pin;

Specifically, the car connection device pulls up the level of the OBDPIN3 pin, that is, makes the level of the OBDPIN3 pin high.

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

Specifically, the car connection device and the component connection device are connected through the OBD interface, for example, the OBDPIN3 pin. In this embodiment of the present application, other pins may also be defined for detection, which is not limited herein.

It is understandable that the OBD standard has 16 PIN pins, and this application uses the OBD PIN3 pin for signal interaction; the software runs a task all the time, and an Analog-to-Digital Converter (ADC) is connected to Input to OBDPIN3 pin, used to sample the voltage of OBD PIN3 pin; judge the connection state between two devices by the voltage obtained by sampling.

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

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

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

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

Step S609: the electronic control unit starts running;

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

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

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

Step S612: the electronic control unit feeds back the execution result of the diagnosis command;

Specifically, the execution result of the diagnostic command, that is, the diagnostic measurement result of the electronic control unit, the diagnostic measurement result includes at least one of the fault code, the battery load state, the current battery mileage and the mileage used by the last battery, the electronic control unit The unit causes the car connection device to forward the diagnostic measurement to the diagnostic device by sending the diagnostic measurement to the car connection device and/or the component connection device.

Step S613: the diagnostic device sends a shutdown command to the car connection device;

Step S614: the vehicle connection device forwards the close command to the component connection device;

Step S615: the component connection device forwards the shutdown command to the electronic control unit;

Step S616: the electronic control unit is turned off and running;

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

Step S618: The car connection device stops heartbeat detection, and pulls down the level of a certain pin;

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

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

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

The flow of link state management is shown in Table 3 below:

table 3

As shown in Table 3 above, in the normal execution process, the diagnostic device will actively remove the link after the diagnosis is executed. 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:

Table 4

Specifically, please refer to FIG. 7 again. FIG. 7 is a schematic structural diagram of another off-line vehicle detection system provided by an embodiment of the present application;

As shown in FIG. 7 , the car connection device 20 can be connected to the component connection device 30 or the whole vehicle 200. When connecting the component connection device 30 for diagnosis, the level of the OBD PIN3 pin will be changed. When the car is 200, the signal of the OBDPIN3 pin cannot be changed casually 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 been clearly connected to the component connection device 30, and the level of the OBD PIN3 pin is pulled up. After the test, it is necessary to restore this signal, that is, pull down the level of the OBD PIN3 pin.

In the embodiment of the present application, if it is recognized 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, so as to obtain information on the components of the vehicle through the vehicle connection device.

Specifically, please refer to FIG. 8 again, which is a schematic flowchart of another offline detection method provided by an embodiment of the present application;

As shown in Figure 8, the process of the offline detection method includes:

Step S801: establishing a diagnostic function link;

Step S802: whether the car connection device is connected to the entire vehicle of the car;

Specifically, the application program of the car-connected device automatically identifies whether the connected device is the entire vehicle of the car or the component-connected device. If it is connected to the entire car of the car, it will go to step S803; S805.

Step S803: Disconnect the link between the vehicle connection device and the component connection device, and switch to the vehicle connection mode;

Specifically, if the car connection device is connected to the entire vehicle of the car, the link between the car connection device and the component connection device is disconnected at this time, and the mode is switched to the car connection mode, so as to obtain the information of the car parts directly through the car connection device , to prevent the components connected to the device from interfering with the car.

Step S804: Obtaining the information of the parts of the car through the car connection device;

Step S805: Detecting through the diagnostic function link.

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

Different processing logic can be realized by judging whether the car connection device is connected to the whole vehicle of the car, which can reuse the diagnosis device and the car connection device, reduce the investment cost of the device, and realize the work in various scenarios.

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 abnormality, power failure, software crash, test service exit and other scenarios, which can improve the system performance. stability, to ensure the normal work of the car test.

In the embodiments of the present application, an offline vehicle detection method is provided. The method includes: establishing a diagnosis function link, wherein the diagnosis function link includes a plurality of function nodes, and the function nodes include a diagnosis device, a vehicle connection device, and a component connection device. Equipment and electronic control unit, wherein the diagnostic equipment is connected to the car connection device, the car 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 vehicle environment of the car; If there is a power supply relationship, the connection status of adjacent functional nodes is determined according to the power supply relationship; if there is no power supply relationship, the connection status of adjacent functional nodes is determined according to the communication relationship and/or signal relationship; Between adjacent functional nodes, a functional node determines the connection status of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes; or, a functional node responds to a diagnostic command and/or Exception signal, which determines the connection status of functional nodes that are not adjacent to it.

By establishing a diagnostic function link, the diagnostic function link includes multiple functional nodes, so that the entire test environment can be tested to ensure the normal operation of the vehicle test; and the adjacent power supply relationship, communication relationship and signal relationship are determined. The connection state between functional nodes and the connection state between non-adjacent functional nodes can improve detection efficiency.

The diagnostic devices of the embodiments of the present application exist in various forms, including but not limited to:

(1) Battery tester refers to an instrument that quickly tests various types of batteries (groups) such as lithium-ion batteries, nickel-hydrogen batteries, and polymer batteries. Such as: mobile phone battery tester, walkie-talkie battery tester, notebook battery tester, etc., which are widely used in the production line production testing of various battery manufacturers. The common battery testers are: battery voltage internal resistance tester, finished battery comprehensive tester, Battery capacity tester, lithium battery protection board tester, battery voltage sorter.

(2) Diagnostic instruments, including automobile fault diagnostic instruments, which are vehicle fault self-test terminals, and automobile fault diagnostic instruments (also known as automobile decoders) are portable intelligent automobile fault self-test instruments used to detect automobile faults. It can be used to quickly read the fault in the electronic control system of the car, and display the fault information through the liquid crystal display screen, and quickly find out the location and cause of the fault.

(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 communication. Such testing devices include: smart phones (eg iPhone), multimedia phones, feature phones, and low-end phones.

(4) Mobile personal computer equipment: This type of equipment belongs to the category of personal computers, has computing and processing functions, and generally has the characteristics of mobile Internet access. Such detection devices include: PDAs, MIDs, and UMPC devices, such as iPads.

(5) Portable entertainment equipment: This type of equipment can display and play video content, and generally has the characteristics of mobile Internet access. Such devices include: video players, handheld game consoles, as well as smart toys and portable car navigation devices.

(6) Other electronic equipment with video playback function and Internet access function.

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by one or more processors, each process of the above-mentioned embodiments of the offline vehicle detection method is implemented, And can achieve the same technical effect, in order to avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disk.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The apparatus or device embodiments described above are only illustrative, wherein the unit modules described as separate components may or may not be physically separated, and the components shown as module units may or may not be physical units, that is, It can be located in one place, or it can be distributed over multiple network module units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile terminal, a personal computer, a server, or a network device, etc.) execute the method of each embodiment or some part of the embodiment of the present application.

Finally, it should be noted that the above-described embodiments in conjunction with the accompanying drawings are only used to illustrate the technical solutions of the present application, and the present application is not limited to the above-mentioned specific embodiments, which are only illustrative rather than limiting. Under the idea of this application, the technical features in the above 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 application as above, in order to Briefly, they are not provided in details; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or the technical solutions described in the foregoing embodiments can be modified. Some technical features are equivalently replaced; and 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 (12)

1. An offline detection method for a vehicle, characterized in that the method comprises: Establish a diagnostic function link, wherein the diagnostic function link includes a plurality of functional nodes, and the functional nodes include a diagnostic device, a car connection device, a component connection device, and an electronic control unit, wherein the diagnostic device is connected to the car connection device, and the car is connected. The 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 vehicle environment of the car; 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 adjacent function nodes are determined according to the communication relationship and/or signal relationship. the connection status of the node; Between non-adjacent functional nodes, a functional node determines the connection status of its non-adjacent functional nodes through the power supply voltage fed back by its adjacent functional nodes; / or abnormal signal, to determine the connection status of functional nodes that are not adjacent to it. 2. The method according to claim 1, wherein the establishing a diagnostic function link comprises: The diagnostic device sends a link establishment message to the car connection device to establish a link between the diagnostic device and the car connection device; The car connection device forwards the link establishment message to the component connection device to establish a link between the car connection device and the component connection device; The diagnostic device sends a start command to the car connection device, and the car connection device forwards the start command to the component connection device, so that the component connection device starts all the components after receiving the start command. 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, wherein the establishing a diagnostic function link further comprises: After the diagnostic device establishes a link with the car connection device, the diagnostic device establishes a heartbeat detection mechanism with the car connection device. 4. The method according to any one of claims 1-3, wherein, determining the connection status of adjacent functional nodes according to the communication relationship and/or the signal relationship, comprising: If there is a communication relationship between adjacent functional nodes, the connection state of the adjacent functional nodes is determined according to the communication response state; If there is no communication relationship between adjacent functional nodes, the connection state 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. 5. The method according to claim 4, wherein the signal relationship includes a heartbeat signal, and determining the connection status of adjacent functional nodes according to the signal relationship, comprising: If a heartbeat detection mechanism is established between the application program of a functional node and an adjacent functional node, and the heartbeat response signal sent by the adjacent functional node is not received within the preset time, it is determined that the adjacent functional node is between There is a broken chain exception. 6. The method of claim 1, wherein the method further comprises: The diagnostic device sends a diagnostic command to the car connection device, the car 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 electronic control unit's diagnostic result. 7. The method according to claim 6, wherein the vehicle connection device, the component connection device and the electronic control unit are communicated and connected through the same bus, and after the vehicle connection device receives the diagnostic command sent by the diagnostic device, the Diagnostic commands are forwarded directly to the electronic control unit. 8. The method according to claim 7, wherein 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 car-connected device, the application of the car-connected device forwards the diagnostic command to the application of the component-connected device, and the application of the component-connected device forwards it to the application of the electronic control unit program to obtain the test results of the electronic control unit. 9. The method of claim 1, wherein the method further comprises: If it is recognized that the car connection device is connected to the entire vehicle of the car, the link between the car connection device and the component connection device is disconnected, so as to obtain the information of the parts of the car through the car connection device. 10. The method of claim 1, wherein: 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. 11. The method of claim 1, wherein: If the diagnostic device and the vehicle connection device are connected in 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. 12. An offline detection system for a vehicle, characterized in that the system comprises: 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, a diagnosis device, connected to the car connection device, for sending a diagnosis command to the car connection device; A car 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, which is connected to the car connection device for simulating the vehicle environment of the car; The electronic control unit is connected to the vehicle connection device and the component connection device, and is used for receiving the diagnosis command and obtaining a diagnosis result.

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