Special detection and calibration integrated system and method for diesel vehicle particulate matter sensor ceramic core

Abstract

The invention discloses a detection and calibration integrated system and method special for a diesel vehicle particulate matter sensor ceramic core. The detection and calibration integrated system comprises the ceramic core, a test jig and detection equipment. The ceramic core is provided with a unique tracing two-dimensional code for identifying and associating detection data of the full life cycle of the ceramic core; the ceramic core is placed in the test fixture; and the detection equipment is connected with the ceramic core. According to the invention, normal-temperature multi-parameter (IDE resistance, capacitance, heater resistance and temperature detector resistance) detection, high-temperature (800 DEG C) key parameter detection and resistance value detection under impact of different time points (10s, 30s and 60s) and different high-temperature gases (100 DEG C, 200 DEG C and 400 DEG C) in a particulate matter environment can be carried out on the ceramic core, and various working conditions in actual work of the ceramic core are simulated; the detection result can better reflect the real performance; the production cost is effectively reduced, and the production benefit is improved; and the management level and the quality stability of the whole production link are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel vehicle particulate matter sensors, and in particular to a dedicated integrated detection and calibration system and method for a diesel vehicle particulate matter sensor ceramic core. Background Art

[0002] At present, a more decentralized detection method is usually used for the detection and calibration of the ceramic core of the diesel vehicle particulate matter sensor. Some traditional detection methods first conduct simple tests on the basic electrical parameters of the ceramic core, such as resistance, capacitance, etc., but most of them are carried out in a single room temperature environment, lacking comprehensive and systematic testing under different temperature conditions. For the performance test of the ceramic core in the particulate matter environment, the overall calibration test is often carried out after the probe is assembled. Once this post-calibration method finds that the ceramic core is unqualified, it will lead to material waste of the entire probe and increase production costs. The data recording and traceability system is imperfect, and it is difficult to effectively manage and quickly query the full life cycle detection data of a single ceramic core, which is not conducive to quality control and problem troubleshooting. In addition, there are the following defects:

[0003] Incomplete testing: It is impossible to accurately simulate the multi-temperature environment and particle conditions of the ceramic core in actual use, resulting in inaccurate evaluation of the performance of the ceramic core, which may cause unqualified products to flow into subsequent production links.

[0004] Serious waste of materials: When problems are found in the later calibration, a large amount of materials have been invested in the assembly of the probe, and the discarded probes cause waste of resources and increase in costs;

[0005] Chaotic data management: lack of effective unique identification and data binding, making it difficult to trace the inspection history and performance changes of a single ceramic core, which is not conducive to production process optimization and quality problem tracing

[0006] Therefore, a special integrated detection and calibration system and method for the ceramic core of the diesel vehicle particulate matter sensor is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a dedicated integrated detection and calibration system and method for the ceramic core of the diesel vehicle particulate matter sensor, so as to realize comprehensive and systematic detection of the ceramic core of the diesel vehicle particulate matter sensor under normal temperature, high temperature and particulate matter environment, improve the detection accuracy, and ensure that the performance of the ceramic core meets the requirements; by performing a complete detection and calibration before the ceramic core is assembled into a probe, and binding the data with a unique traceability QR code, unqualified ceramic cores can be screened out in advance, thereby reducing material waste and lowering production costs; a complete ceramic core data recording and traceability system is established to facilitate the management, query and analysis of the detection data of each ceramic core, so as to quickly locate the root cause of quality problems and optimize the production process.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A dedicated integrated detection and calibration system for diesel vehicle particulate matter sensor ceramic cores, including ceramic cores, test fixtures, and detection equipment;

[0010] The ceramic core is provided with a unique traceability QR code for identifying and associating the testing data of the entire life cycle of the ceramic core;

[0011] The ceramic core is placed inside the test fixture;

[0012] The detection device is connected to the ceramic core.

[0013] Furthermore, the detection equipment performs multi-condition detection on the ceramic core under normal temperature, high temperature, high pressure and particulate matter environment, and stores the detection data in conjunction with the QR code.

[0014] The dedicated detection and calibration method for the ceramic core of the diesel vehicle particulate matter sensor includes the following steps:

[0015] 1) Ceramic core identification: a unique traceability QR code is printed for each ceramic core;

[0016] 2) Test preparation: Place the ceramic core on the test fixture and connect it, then turn on the test equipment;

[0017] 3) Normal temperature detection: detect the normal temperature IDE resistance value (should be open circuit), IDE capacitance value, heater resistance value, thermometer resistance value, and record the current temperature and all normal temperature detection values;

[0018] 4) High temperature detection: send dew point start command, detect IDE resistance value, heater resistance value, thermometer resistance value, record current temperature and all detection values;

[0019] 5) High voltage detection: Send test instructions to the ceramic cores that have passed the normal temperature and high temperature tests, pressurize the IDE to 60V, and add a current limiting protector to the circuit;

[0020] 6) Particle environment detection: Install the ceramic core in a particle atmosphere, record the resistance value, pass high temperature gas and record the resistance value at different temperatures, and record a total of six sets of resistance data;

[0021] 7) Calibration: Compare the six sets of resistance data with the performance of the standard ceramic core, fit the calibration curve, store the data in the data system and bind them to the QR code one by one to determine whether they are qualified;

[0022] 8) Finished product assembly: When assembling the finished product, scan the chip QR code, retrieve the data, burn it into the particle controller and complete the finished product assembly test.

[0023] Furthermore, in the step 4), the IDE resistance value, the heater resistance value, and the temperature sensor resistance value at 800° C. are detected, and the current temperature and all detected values ​​at 800° C. are recorded.

[0024] Furthermore, in the step 5), a current limiting protector is added to the circuit to provide protection after the current exceeds 30 μA.

[0025] Further, in step 6), the ceramic core is installed at 5 mg / m 3 In the particulate matter atmosphere, the resistance values ​​were recorded at 10s, 30s, and 60s. After 60s, high-temperature gases at 100℃, 200℃, and 400℃ were introduced and the resistance values ​​at different temperatures were recorded.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention can detect the ceramic core's multi-parameters (IDE resistance, capacitance, heater resistance, thermometer resistance) at room temperature, key parameters at high temperature (800°C), and resistance values ​​at different time points (10s, 30s, 60s) and under the impact of different high-temperature gases (100°C, 200°C, 400°C) in a particulate matter environment, simulating various working conditions of the ceramic core in actual operation, and the test results can better reflect its true performance;

[0028] Before assembly, the inspection and calibration are completed and defective products are screened out, which avoids the waste of probe materials caused by the discovery of unqualified ceramic cores after assembly, effectively reducing production costs and improving production efficiency;

[0029] Each ceramic core is given a unique traceability QR code, and its full-process inspection data is bound to the QR code, enabling accurate data traceability and efficient management, facilitating production process monitoring, quality problem tracing, and process improvement analysis, thereby improving the management level and quality stability of the entire production link. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a normal temperature process schematic diagram of the present invention;

[0032] Figure 3 It is a schematic diagram of the high temperature process of the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Embodiment 1:

[0035] See also Figure 1-3 , the present invention provides a technical solution:

[0036] A dedicated integrated detection and calibration system for diesel vehicle particulate matter sensor ceramic cores, including ceramic cores, test fixtures, and detection equipment;

[0037] The ceramic core is equipped with a unique traceability QR code for identifying and associating the test data of the entire life cycle of the ceramic core. The ceramic core is placed inside the test fixture to ensure that its connectors are reliably connected to achieve stable and accurate testing. The testing equipment is connected to the ceramic core, including normal temperature (including IDE resistance, capacitance, heater resistance, and thermometer resistance testing), high temperature (IDE resistance, heater resistance, and thermometer resistance testing at 800°C), high voltage (IDE pressure 60V with current limiting protection) and particulate matter environment (5mg / m 3 Multi-condition testing (resistance value detection at different times and under different high-temperature gas impacts in particulate matter atmosphere) and the test data is bound and stored with the QR code.

[0038] The dedicated detection and calibration method for the ceramic core of the diesel vehicle particulate matter sensor includes the following steps:

[0039] 1) Ceramic core identification: a unique traceability QR code is printed for each ceramic core. This QR code serves as the identity of the ceramic core and runs through the entire testing, calibration, assembly and subsequent use process to record and query all data and information related to it;

[0040] 2) Test preparation: Place the ceramic core on the test fixture and connect it, turn on the test equipment, ensure that the ceramic core and the connector of the test fixture are reliably connected to avoid inaccurate test data due to poor contact, turn on the test equipment, put it into the state to be tested, and prepare to perform a series of test operations on the ceramic core;

[0041] 3) Normal temperature detection: detect the normal temperature IDE resistance value (use professional detection instruments to detect the IDE resistance value at normal temperature. Under normal circumstances, it should be in an open circuit state. If it is not open circuit, it may indicate that the ceramic core has a short circuit fault or other problems; at the same time, detect the normal temperature heater resistance value and the normal temperature thermometer resistance value, and judge whether it is within the normal range by comparing the standard resistance value range to determine whether the initial performance of the heater and the thermometer is qualified), IDE capacitance value (detect the normal temperature IDE capacitance value, and evaluate whether the capacitance characteristics of the ceramic core meet the requirements according to the pre-set capacitance value standard range. Abnormal capacitance value may affect the signal transmission and filtering functions of the ceramic core in the circuit), heater resistance value, thermometer resistance value, and record the current temperature and all normal temperature detection values. The IDE resistance value, capacitance value, heater resistance value, thermometer resistance value, and ambient temperature of the ceramic core detected at the above normal temperature are stored, and associated with the unique traceability QR code of the ceramic core for subsequent query and analysis;

[0042] 4) High temperature detection: Send a dew point start command to make the internal environment of the detection equipment reach a specific dew point condition. Under this condition, detect the IDE resistance value at 800°C, the heater resistance value at 800°C, and the thermometer resistance value at 800°C. The changes in these parameters under high temperature environment can reflect the performance stability and reliability of the ceramic core under high temperature conditions. For example, the change in the heater resistance value at high temperature will affect its heating efficiency. The change in the IDE resistance value is related to the adsorption and reaction characteristics of the ceramic core to particulate matter. The accuracy of the thermometer resistance value is directly related to the accuracy of temperature measurement. Record the current temperature again (make sure the temperature reaches 800°C and is stable), store the various parameter data obtained at 800°C together with the previous normal temperature data and update them to the database associated with the ceramic core QR code, forming a performance data chain of the ceramic core at different temperatures. Send test instructions for the ceramic core that has passed both normal temperature and high temperature tests, and enter the next step of high-voltage detection;

[0043] 5) High voltage detection: IDE is pressurized to 60V, and a current limiting protector is connected in series in the circuit. When the current in the circuit exceeds 30μA, the current limiting protector starts and cuts off the circuit to prevent excessive current from damaging the ceramic core. This step is mainly to test the insulation performance and tolerance of the ceramic core under high voltage environment to ensure that it will not fail due to overvoltage and overcurrent in actual work;

[0044] 6) Particulate matter environment detection: The ceramic core is installed in a simulated diesel vehicle actual operating environment containing 5mg / m 3 In the particulate matter atmosphere box, the resistance value of the ceramic core is detected at 10s, 30s, and 60s respectively. As time goes by, the ceramic core surface will adsorb particulate matter, and its resistance value will change accordingly. By detecting the resistance values ​​at different time points, the adsorption rate and sensitivity of the ceramic core to particulate matter can be evaluated. After 60s, high-temperature gases of 100℃, 200℃, and 400℃ are introduced in sequence. During the process of introducing high-temperature gases, the resistance value change of the ceramic core is continuously detected, and these 6 sets of resistance data (including 10s, 30s, 60s and the resistance value when introducing 100℃, 200℃, and 400℃ high-temperature gases) are recorded. The introduction of high-temperature gases will cause the particulate matter adsorbed on the surface of the ceramic core to undergo oxidation and other reactions, thereby further changing the resistance value of the ceramic core. These data can fully reflect the performance change characteristics of the ceramic core under particulate matter environments and different temperature shocks.

[0045] 7) Calibration: Compare and analyze the six sets of resistance data of the ceramic core in the particulate environment and at different temperatures with the performance data of the standard ceramic core, and fit the calibration curve through a specific algorithm. If the deviation between the performance data of the ceramic core and the standard curve is within the allowable range, the ceramic core is judged to be qualified for calibration; if the deviation exceeds the range, it is judged to be a defective product;

[0046] 8) Finished product assembly: When assembling the finished diesel vehicle particulate matter sensor, first scan the QR code of the ceramic core, retrieve the previously stored detection calibration data from the data system, and then accurately burn these data into the particulate matter controller. This ensures that when the finished sensor is installed on the vehicle, the controller can accurately control and monitor according to the actual performance parameters of the ceramic core, thereby improving the working performance and reliability of the entire sensor. At the same time, it also completes the finished product assembly test link, ensuring the quality consistency and stability of the finished product.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dedicated integrated detection and calibration system for diesel vehicle particulate matter sensor ceramic cores, characterized in that: Including ceramic cores, test fixtures, and testing equipment; The ceramic core is provided with a unique traceability QR code for identifying and associating the testing data of the entire life cycle of the ceramic core; The ceramic core is placed inside the test fixture; The detection device is connected to the ceramic core.

2. The dedicated detection and calibration integrated system for the diesel vehicle particulate matter sensor ceramic core according to claim 1 is characterized in that: The detection equipment performs multi-condition detection on the ceramic core under normal temperature, high temperature, high pressure and particulate matter environment, and stores the detection data in combination with the QR code.

3. The special detection and calibration method for the diesel vehicle particulate matter sensor ceramic core according to claim 1 is characterized in that: The following steps are involved: 1) Ceramic core identification: a unique traceability QR code is printed for each ceramic core; 2) Test preparation: Place the ceramic core on the test fixture and connect it, then turn on the test equipment; 3) Normal temperature detection: detect the normal temperature IDE resistance value (should be open circuit), IDE capacitance value, heater resistance value, thermometer resistance value, and record the current temperature and all normal temperature detection values; 4) High temperature detection: send dew point start command, detect IDE resistance value, heater resistance value, thermometer resistance value, record current temperature and all detection values; 5) High voltage detection: Send test instructions to the ceramic cores that have passed the normal temperature and high temperature tests, pressurize the IDE to 60V, and add a current limiting protector to the circuit; 6) Particle environment detection: Install the ceramic core in a particle atmosphere, record the resistance value, pass high temperature gas and record the resistance value at different temperatures, and record a total of six sets of resistance data; 7) Calibration: Compare the six sets of resistance data with the performance of the standard ceramic core, fit the calibration curve, store the data in the data system and bind them to the QR code one by one to determine whether they are qualified; 8) Finished product assembly: When assembling the finished product, scan the chip QR code, retrieve the data, burn it into the particle controller and complete the finished product assembly test.

4. The special detection and calibration method for the diesel vehicle particulate matter sensor ceramic core according to claim 1 is characterized in that: In the step 4), the IDE resistance value, the heater resistance value, and the temperature sensor resistance value at 800° C. are detected, and the current temperature and all detected values ​​at 800° C. are recorded.

5. The special detection and calibration method for the diesel vehicle particulate matter sensor ceramic core according to claim 1 is characterized in that: In the step 5), a current limiting protector is added to the circuit to provide protection when the current exceeds 30 μA.

6. The special detection and calibration method for the diesel vehicle particulate matter sensor ceramic core according to claim 1 is characterized by: In step 6), the ceramic core is installed in 5 mg / m 3 In the particulate matter atmosphere, the resistance values ​​were recorded at 10s, 30s, and 60s. After 60s, high-temperature gases at 100℃, 200℃, and 400℃ were introduced and the resistance values ​​at different temperatures were recorded.

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