Tamper-proof OBD diagnostic instrument calibration device and calibration method

Abstract

The invention belongs to the technical field of measurement, provides a calibration device capable of accurately detecting whether data tampering behaviors exist in the data uploading process of an OBD diagnostic instrument or not and effectively preventing the detection cheating phenomenon, and particularly relates to a tampering-proof OBD diagnostic instrument calibration device and a tampering-proof OBD diagnostic instrument calibration method. The system comprises an upper computer unit, a lower computer unit, a data simulation module, a protocol conversion module, a data acquisition module and a data verification module. By generating standard protocol data, simulating vehicle signals, collecting diagnostic instrument data in real time and adopting an integrity, consistency and rationality verification mechanism to analyze data characteristics, the method comprises the steps of protocol configuration, signal generation, data collection, verification and early warning, and supports multi-protocol parallel processing and a dynamic weight distribution algorithm. According to the method, the data tampering behavior can be accurately identified, the authenticity and reliability of the detection data are effectively improved, and technical guarantee is provided for motor vehicle emission supervision.

Description

Technical Field

[0001] The present invention belongs to the technical field of measurement, and provides a calibration device that can accurately detect whether there is any behavior of tampering with data during the data uploading process of an OBD diagnostic instrument, and effectively prevent the occurrence of detection cheating phenomena. In particular, it relates to an anti-tampering OBD diagnostic instrument calibration device and a calibration method. Background Art

[0002] In the motor vehicle emission detection system, as a core device, the authenticity of the data of the OBD diagnostic instrument directly affects the effectiveness of emission supervision. However, there is a widespread phenomenon of data tampering in the current detection industry. Some detection institutions implant programs that shield fault codes in the diagnostic instrument through hardware modification, or interfere with the communication link through external devices, and tamper with the excessive emission data into a compliance value for uploading. Such behaviors cause a large number of highly polluting vehicles to pass the detection, exacerbate air pollution, damage the fair competition environment of the market, and make it difficult for the regulatory authorities to accurately evaluate the emission situation. The existing supervision measures mainly rely on manual sampling inspection and administrative penalties. However, due to the concealment and technicalization of the cheating means of detection institutions, it is difficult for traditional methods to discover data tampering behaviors in real time. Although some technical solutions attempt to improve the credibility of data by adding a verification mechanism, the existing technologies still have defects such as insufficient protocol compatibility, single verification dimension, and lagging warning response, and cannot effectively cope with complex and diverse cheating means. Therefore, there is an urgent need for an anti-tampering calibration device that can simulate a real vehicle signal environment and monitor the integrity, consistency, and rationality of the diagnostic instrument data in real time through multi-dimensional data verification technology, so as to solve the problem of data distortion existing in the existing detection system and ensure the objectivity of the emission detection results and the implementation effect of the supervision policy. Summary of the Invention

[0003] The present invention proposes an anti-tampering OBD diagnostic instrument calibration device and a calibration method. The purpose of the present invention is to provide a calibration device that can accurately detect whether there is any behavior of tampering with data during the data uploading process of an OBD diagnostic instrument and effectively prevent the occurrence of detection cheating phenomena.

[0004] The technical solution of the present invention is as follows: An anti-tampering OBD diagnostic instrument calibration device includes a host computer unit, a slave computer unit, a data simulation module, a protocol conversion module, a data acquisition module, and a data verification module. The data simulation module, the protocol conversion module, the data acquisition module, and the data verification module are all integrated on the host computer unit. The host computer unit is used to generate standard protocol data, and the slave computer unit is used to convert the standard protocol data into standard vehicle signals. The data simulation module is arranged in the host computer unit and can perform protocol type selection, data parameter configuration, and data transmission control. The protocol conversion module includes a signal conversion circuit and a communication interface adaptation unit. The data acquisition module is used to obtain the vehicle detection data uploaded by the OBD diagnostic instrument in real time, and the data verification module is used to verify the detection data based on preset rules.

[0005] As a preferred solution of the present invention, further, the protocol type selection sub-module of the data simulation module supports the switching of multiple different communication protocols. The data parameter configuration sub-module has an expandable parameter configuration database, and the data transmission control sub-module exchanges data with the slave computer unit through an encrypted communication link.

[0006] As a preferred solution of the present invention, further, the signal conversion circuit of the protocol conversion module includes an analog-to-digital conversion unit and a level matching circuit, and the communication interface adaptation unit supports the OBD-II standard interface and multiple extended interface types.

[0007] As a preferred solution of the present invention, further, the data acquisition module includes a real-time data stream capture unit, a fault code analysis unit, and a vehicle status information extraction unit, and each unit adopts a parallel processing architecture.

[0008] As a preferred solution of the present invention, further, the data verification module includes an integrity verification unit, a consistency verification unit, and a rationality verification unit. The integrity verification unit verifies the compliance of the data frame structure. The consistency verification unit compares the logical relevance between the original data and the detection data. The rationality verification unit analyzes the statistical distribution characteristics of the data sequence.

[0009] As a preferred solution of the present invention, further, it further includes an early warning module and a log recording module. The early warning module is used to trigger an early warning mechanism when the detection data exceeds the preset threshold range, and the log recording module is used to generate an operation log and a data verification record including a timestamp.

[0010] An anti-tampering OBD diagnostic instrument calibration method includes the following steps: S1. Protocol configuration step, select the target communication protocol type and configure standard data parameters through the host computer unit; S2. Signal generation step: The slave unit converts the standard data parameters into analog signals that comply with vehicle communication standards; S3. Data acquisition step: Obtain the detection data of the device under test, the OBD diagnostic instrument, through the communication protocol; S4. Data verification step: Verify the detection data based on preset rules; S5. Early warning processing step: Trigger corresponding early warning responses according to the verification results.

[0011] As a preferred solution of the present invention, further, the protocol configuration step supports simultaneously loading data configuration files of multiple different protocols, the signal generation step uses time-division multiplexing technology to simulate multiple groups of vehicle signals, the data verification step uses a dynamic weight distribution algorithm to comprehensively evaluate the results of each verification dimension, and the early warning processing step includes threshold early warning, trend early warning, and pattern early warning.

[0012] The beneficial effects of the present invention are as follows: Through multi-dimensional verification mechanisms such as integrity verification, consistency verification, and rationality verification, and comprehensive evaluation by the dynamic weight distribution algorithm, the present invention can accurately detect whether there is any tampering behavior in the data uploaded by the OBD diagnostic instrument, effectively prevent the occurrence of cheating phenomena, and greatly improve the authenticity and reliability of the detection data.

[0013] The protocol type selection sub-module of the data simulation module supports the switching of multiple different communication protocols, and the communication interface adaptation unit of the protocol conversion module supports the OBD-II standard interface and multiple extended interface types, enabling the calibration device to adapt to the communication requirements of different brands, models of vehicles, and OBD diagnostic instruments, and having wide applicability.

[0014] The early warning module can issue early warning signals in a timely manner when the detection data is abnormal. By combining threshold early warning, trend early warning, and pattern early warning, the timeliness and accuracy of early warning are improved. The operation log and data verification record containing timestamps generated by the log recording module provide strong evidence for tracing and analyzing data tampering behavior, which helps the regulatory authorities to conduct effective supervision.

[0015] The data distribution control sub-module exchanges data with the slave unit through an encrypted communication link, and uses an advanced encryption algorithm to encrypt the data, ensuring the security and integrity of the data during transmission and preventing the data from being stolen or tampered with.

[0016] The data parameter configuration sub-module of the data simulation module has an expandable parameter configuration database. Users can configure and modify the standard data parameters according to needs, and can also easily expand and update the database to meet the requirements of new vehicle models and new protocols. Description of the Drawings

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 is the overall structural block diagram of the present invention; Figure 2 is the structural block diagram of the protocol conversion module of the present invention; Figure 3 is the structural block diagram of the data acquisition module of the present invention; Figure 4 is the structural block diagram of the data verification module of the present invention; Figure 5 is the flow block diagram of the embodiment of the present invention.

[0019] In the figure: 1, host computer unit; 11, data simulation module; 2, slave computer unit; 3, protocol conversion module; 31, analog-to-digital conversion unit; 32, level matching circuit; 4, data acquisition module; 41, real-time data stream capture unit; 42, fault code analysis unit; 43, vehicle status information extraction unit; 5, data verification module; 51, integrity verification unit; 52, consistency verification unit; 53, rationality verification unit. Specific Embodiments

[0020] Next, in conjunction with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0021] Embodiment 1 As Figures 1 to 5 shown, this embodiment proposes an anti-tampering OBD diagnostic instrument calibration device, including a host computer unit 1, a slave computer unit 2, a data simulation module 11, a protocol conversion module 3, a data acquisition module 4, and a data verification module 5. The data simulation module 11, the protocol conversion module 3, the data acquisition module 4, and the data verification module 5 are all integrated on the host computer unit 1. The host computer unit 1 is used to generate standard protocol data, and the slave computer unit 2 is used to convert the standard protocol data into standard vehicle signals. The data simulation module 11 is disposed within the host computer unit 1 and can perform protocol type selection, data parameter configuration, and data transmission control. The protocol conversion module 3 includes a signal conversion circuit and a communication interface adaptation unit. The data acquisition module 4 is used to obtain in real time the vehicle detection data uploaded by the OBD diagnostic instrument, and the data verification module 5 is used to verify the detection data based on preset rules.

[0022] The protocol type selection sub-module of the data simulation module 11 supports the switching of multiple different communication protocols. The data parameter configuration sub-module has an extensible parameter configuration database. The data distribution control sub-module exchanges data with the lower computer unit 2 through an encrypted communication link.

[0023] The signal conversion circuit of the protocol conversion module 3 includes an analog-to-digital conversion unit 31 and a level matching circuit 32. The communication interface adaptation unit supports the OBD-II standard interface and various extended interface types.

[0024] The data acquisition module 4 includes a real-time data stream capture unit 41, a fault code analysis unit 42, and a vehicle status information extraction unit 43. Each unit adopts a parallel processing architecture.

[0025] The data verification module 5 includes an integrity verification unit 51, a consistency verification unit 52, and a rationality verification unit 53. The integrity verification unit 51 verifies the compliance of the data frame structure. The consistency verification unit 52 compares the logical relevance between the original data and the detected data. The rationality verification unit 53 analyzes the statistical distribution characteristics of the data sequence.

[0026] It also includes an early warning module and a log recording module. The early warning module is used to trigger an early warning mechanism when the detected data exceeds the preset threshold range. The log recording module is used to generate an operation log and a data verification record including a timestamp.

[0027] The present invention also provides an anti-tampering OBD diagnostic instrument calibration method, including the following steps: S1. Protocol configuration step: Select the target communication protocol type and configure standard data parameters through the upper computer unit 1; S2. Signal generation step: The lower computer unit 2 converts the standard data parameters into analog signals that conform to the vehicle communication standard; S3. Data acquisition step: Obtain the detection data of the OBD diagnostic instrument of the device under test through the communication protocol; S4. Data verification step: Verify the detection data based on preset rules; S5. Early warning processing step: Trigger corresponding early warning responses according to the verification results.

[0028] The protocol configuration step supports the simultaneous loading of data configuration files of multiple different protocols. The signal generation step uses time-division multiplexing technology to simulate multiple groups of vehicle signals. The data verification step uses a dynamic weight allocation algorithm to comprehensively evaluate the results of each verification dimension. The early warning processing step includes threshold early warning, trend early warning, and pattern early warning.

[0029] In this embodiment, specifically: The anti-tampering OBD diagnostic instrument calibration device of the present invention includes a host computer unit 1, a slave computer unit 2, a data simulation module 11, a protocol conversion module 3, a data acquisition module 4, a data verification module 5, an early warning module, and a log recording module.

[0030] Host computer unit 1: It is mainly used to generate standard protocol data. It can generate standard data that conforms to the corresponding communication protocol according to different detection requirements and vehicle types, providing a basis for subsequent detection and calibration. The host computer unit 1 usually has strong data processing and storage capabilities, and can store a large amount of standard protocol data and detection history records.

[0031] Slave computer unit 2: It is responsible for converting the standard protocol data generated by the host computer unit 1 into standard vehicle signals. The slave computer has a standard OBD connector for the device under test to connect and read, and sends the simulated standard signals to the OBD diagnostic instrument, enabling it to perform tests according to the simulated vehicle state, thus providing a real detection environment for subsequent data acquisition and verification.

[0032] Data simulation module 11: It is set in the host computer unit 1 and includes a protocol type selection sub-module, a data parameter configuration sub-module, and a data transmission control sub-module.

[0033] Protocol type selection sub-module: It supports the switching of multiple different communication protocols. Since different brands and models of vehicles may adopt different communication protocols, such as ISO 15765, SAE J1939, etc., this sub-module can flexibly select the appropriate communication protocol according to the specific vehicle type and detection requirements to ensure the compatibility of the calibration device with various OBD diagnostic instruments.

[0034] Data parameter configuration sub-module: It has an expandable parameter configuration database, which stores standard parameter information of various vehicles, such as engine speed, vehicle speed, emission data, etc. Users can configure and modify these parameters as needed to simulate the operating states of different vehicles. At the same time, as new vehicle models and new protocols emerge, the database can be easily expanded and updated.

[0035] Data transmission control sub-module: It exchanges data with the slave computer unit 2 through an encrypted communication link. The encrypted communication link uses advanced encryption algorithms, such as the AES advanced encryption standard, to encrypt the transmitted data, preventing the data from being stolen or tampered with during transmission, and ensuring the security and reliability of data transmission.

[0036] Protocol conversion module 3: It includes a signal conversion circuit and a communication interface adaptation unit.

[0037] Signal conversion circuit: It includes an analog-to-digital conversion unit 31 and a level matching circuit 32. The analog-to-digital conversion unit 31 converts the digital signal sent by the host unit 1 into an analog signal to be compatible with the vehicle's electrical system, and the level matching circuit 32 adjusts the signal level to ensure that the signal strength and amplitude meet the requirements of vehicle communication.

[0038] Communication interface adaptation unit: It supports the OBD-II standard interface and various extended interface types. In addition to the common OBD-II standard interface, it can also be compatible with the extended interfaces of some special vehicles or devices, improving the versatility and applicability of the calibration device.

[0039] Data acquisition module 4: It is used to obtain the vehicle detection data uploaded by the OBD diagnostic instrument in real time. It includes a real-time data stream capture unit 41, a fault code analysis unit 42, and a vehicle status information extraction unit 43. Each unit adopts a parallel processing architecture.

[0040] Real-time data stream capture unit 41: It can capture various real-time data uploaded by the OBD diagnostic instrument in real time, such as the real-time engine speed, intake air volume, water temperature, etc., providing a rich data source for subsequent data analysis and verification.

[0041] Fault code analysis unit 42: It analyzes the fault codes uploaded by the OBD diagnostic instrument, identifies the possible fault types and locations of the vehicle, and can quickly judge the authenticity and accuracy of the fault codes by comparing with the standard fault code library.

[0042] Vehicle status information extraction unit 43: It extracts various status information of the vehicle from the detection data, such as the vehicle's driving mode, gear information, etc., in order to comprehensively understand the vehicle's operating status.

[0043] Data verification module 5: It is used to verify the detection data based on preset rules, including an integrity verification unit 51, a consistency verification unit 52, and a rationality verification unit 53.

[0044] Integrity verification unit 51: It verifies the compliance of the data frame structure. It checks whether the data frame format of the detection data conforms to the regulations of the corresponding communication protocol, including the length, start bit, end bit, check bit, etc. of the data frame, ensuring that the data is not lost or damaged during transmission.

[0045] Consistency verification unit 52: It compares the logical relevance between the original data and the detection data. By analyzing the logical relationship between various parameters in the detection data, such as the relationship between engine speed and vehicle speed, intake air volume and fuel injection volume, it judges whether the detection data conforms to the normal physical logic, so as to detect possible data tampering behavior.

[0046] Rationality verification unit 53: Analyze the statistical distribution characteristics of the data sequence. It conducts statistical analysis on the detected data, such as calculating statistical quantities like the mean, variance, and standard deviation of the data, and determines whether the distribution of the data conforms to normal statistical laws. If the statistical distribution of the data shows anomalies, it may indicate that the data has been tampered with.

[0047] Early warning module: Used to trigger the early warning mechanism when the detected data exceeds the preset threshold range. The preset threshold range is set based on a large amount of experimental data and actual detection experience. When a certain parameter in the detected data exceeds this threshold range, the early warning module will immediately send out an early warning signal. The early warning signal can be in various forms such as audible and visual alarms, SMS notifications, email reminders, etc., to promptly inform the supervision personnel of possible data tampering behaviors.

[0048] Log recording module: Used to generate operation logs and data verification records containing timestamps. It records all operation processes and data verification results of the calibration device, including data acquisition time, verification time, verification results, early warning information, etc. These log records can serve as important evidence for tracing and analyzing data tampering behaviors, and also help monitor and evaluate the operation status of the calibration device.

[0049] The anti-tampering OBD diagnostic instrument calibration method of the present invention includes the following steps, specifically: S1. Protocol configuration step: Select the target communication protocol type and configure standard data parameters through the host computer unit 1. The operator can select the appropriate communication protocol in the protocol type selection sub-module of the data simulation module 11 according to the type of the vehicle to be detected and the communication protocol of the OBD diagnostic instrument, and at the same time configure the corresponding standard data parameters in the data parameter configuration sub-module, such as the engine speed range, emission data standard, etc. This step supports loading multiple different protocol data configuration files simultaneously, facilitating the detection of different types of vehicles.

[0050] S2. Signal generation step: The lower computer unit 2 converts the standard data parameters into analog signals that conform to the vehicle communication standard. After the lower computer unit 2 receives the standard data parameters sent by the host computer unit 1, it converts the digital signal into an analog signal through the signal conversion circuit of the protocol conversion module 3, and the analog signal is given to the device under test for reading through the standard OBD connector on the lower computer. This step uses time-division multiplexing technology to simulate multiple groups of vehicle signals, and can simultaneously simulate the vehicle operation states under different working conditions, improving the comprehensiveness and accuracy of the detection.

[0051] S3. Data collection step: Obtain the detection data of the OBD diagnostic instrument of the device under test through the communication protocol. The real-time data stream capture unit 41, fault code analysis unit 42, and vehicle status information extraction unit 43 of the data collection module 4 work in parallel to capture various detection data uploaded by the OBD diagnostic instrument in real time, including real-time data stream, fault codes, vehicle status information, etc.

[0052] S4. Data verification step: Verify the detection data based on preset rules. The integrity verification unit 51, consistency verification unit 52, and rationality verification unit 53 of the data verification module 5 verify the detection data respectively. The integrity verification unit 51 verifies the compliance of the data frame structure. The consistency verification unit 52 compares the logical relevance between the original data and the detection data. The rationality verification unit 53 analyzes the statistical distribution characteristics of the data sequence. This step uses a dynamic weight allocation algorithm to comprehensively evaluate the results of each verification dimension, and dynamically adjusts the weights of each verification dimension according to different detection scenarios and data characteristics to improve the accuracy and reliability of the verification results.

[0053] S5. Early warning processing step: Trigger corresponding early warning responses according to the verification results. The early warning module judges whether the detection data exceeds the preset threshold range according to the data verification results. If it exceeds the threshold range, the corresponding early warning mechanism is triggered. The early warning processing step includes threshold early warning, trend early warning, and pattern early warning.

[0054] Threshold early warning: When a certain parameter in the detection data exceeds the preset threshold, an early warning signal is immediately sent. When the engine speed exceeds the normal range, the threshold early warning is triggered.

[0055] Trend early warning: By analyzing the change trend of the detection data, judge whether there is an abnormality. If the detection data shows an abnormal upward or downward trend within a period of time, even if it has not exceeded the threshold, the trend early warning will be triggered. The continuous increase in emission data may indicate data tampering or vehicle failure.

[0056] Pattern early warning: Match the detection data according to the preset abnormal data pattern. If the detection data conforms to a certain abnormal pattern, such as an abnormal combination of fault codes, periodic fluctuations of data, etc., the pattern early warning is triggered.

Claims

1. A tamper-proof OBD diagnostic instrument calibration device, characterized in that: It includes a host computer unit, a slave computer unit, a data simulation module, a protocol conversion module, a data acquisition module and a data verification module. The data simulation module, protocol conversion module, data acquisition module and data verification module are all integrated on the host computer unit. The host computer unit is used to generate standard protocol data, and the slave computer unit is used to convert the standard protocol data into standard vehicle signals. The data simulation module is arranged in the host computer unit and can perform protocol type selection, data parameter configuration and data sending control. The protocol conversion module includes a signal conversion circuit and a communication interface adapter unit. The data acquisition module is used to obtain vehicle detection data uploaded by the OBD diagnostic instrument in real time, and the data verification module is used to verify the detection data based on preset rules.

2. The tamper-proof OBD diagnostic instrument calibration device according to claim 1, characterized in that: The protocol type selection submodule of the data simulation module supports switching of multiple different communication protocols, the data parameter configuration submodule has an expandable parameter configuration database, and the data sending control submodule exchanges data with the lower computer unit through an encrypted communication link.

3. The tamper-proof OBD diagnostic instrument calibration device according to claim 2, characterized in that: The signal conversion circuit of the protocol conversion module includes an analog-to-digital conversion unit and a level matching circuit, and the communication interface adapter unit supports the OBD-II standard interface and multiple extended interface types.

4. The tamper-proof OBD diagnostic instrument calibration device according to claim 3, characterized in that: The data acquisition module includes a real-time data stream capture unit, a fault code analysis unit and a vehicle status information extraction unit, and each unit adopts a parallel processing architecture.

5. The tamper-proof OBD diagnostic instrument calibration device according to claim 4, characterized in that: The data verification module includes an integrity verification unit, a consistency verification unit and a rationality verification unit. The integrity verification unit verifies the compliance of the data frame structure, the consistency verification unit compares the logical correlation between the original data and the detection data, and the rationality verification unit analyzes the statistical distribution characteristics of the data sequence.

6. The tamper-proof OBD diagnostic instrument calibration device according to claim 5, characterized in that: It also includes an early warning module and a log recording module. The early warning module is used to trigger the early warning mechanism when the detection data exceeds a preset threshold range, and the log recording module is used to generate an operation log containing a timestamp and a data verification record.

7. A tamper-proof OBD diagnostic instrument calibration method, using the tamper-proof OBD diagnostic instrument calibration device according to claim 6, characterized in that: The following steps are involved: S1, protocol configuration step, select the target communication protocol type and configure standard data parameters through the host computer unit; S2, signal generation step, the lower computer unit converts the standard data parameters into analog signals that meet the vehicle communication standard; S3, data collection step, obtaining the detection data of the OBD diagnostic instrument of the device under test through the communication protocol; S4, a data verification step, verifying the detection data based on preset rules; S5: Early warning processing step, triggering corresponding early warning response according to the verification result.

8. The tamper-proof OBD diagnostic instrument calibration method according to claim 7, characterized in that: The protocol configuration step supports loading data configuration files of multiple different protocols at the same time. The signal generation step uses time division multiplexing technology to simulate multiple groups of vehicle signals. The data verification step uses a dynamic weight allocation algorithm to comprehensively evaluate the results of each verification dimension. The warning processing step includes threshold warning, trend warning and pattern warning.

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