Diesel vehicle particulate matter sensor ceramic core special detection calibration integrated system and method

Abstract

The application discloses a diesel vehicle particulate matter sensor ceramic core special detection and calibration integrated system and method, which comprises a ceramic core, a test fixture and a detection device; the ceramic core is provided with a unique traceability two-dimensional code for identifying and associating detection data of the whole life cycle of the ceramic core; the ceramic core is placed in the test fixture; and the detection device is connected with the ceramic core. The application can detect the ceramic core at normal temperature and multiple parameters (IDE resistance, capacitance, heater resistance and temperature detector resistance), detect key parameters at high temperature (800 DEG C), and detect resistance values at different time points (10s, 30s and 60s) and under the impact of different high-temperature gases (100 DEG C, 200 DEG C and 400 DEG C) in the particulate matter environment, so that multiple working conditions of the ceramic core in actual work are simulated, the detection results can better reflect the real performance, the production cost is effectively reduced, the production benefit is improved, and the management level and quality stability of the whole production link are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel vehicle particulate matter sensor, in particular to a special detection and calibration integrated system and method for diesel vehicle particulate matter sensor ceramic cores. BACKGROUND

[0002] At present, in the detection and calibration of diesel vehicle particulate matter sensor ceramic cores, a relatively dispersed detection method is usually adopted. Some traditional detection methods first perform simple tests on the basic electrical parameters of the ceramic cores, such as resistance, capacitance, etc., but are mostly performed at a single normal temperature environment, lacking comprehensive and systematic detection under different temperature conditions. For the performance detection of the ceramic cores in the particulate matter environment, overall calibration tests are usually performed after the ceramic cores are assembled into probes, and once it is found that the ceramic cores are unqualified, the material waste of the entire probe will be caused, increasing the production cost. The data recording and tracing 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, the following defects exist:

[0003] Incomprehensive detection: unable to accurately simulate the multi-temperature environment and particulate matter conditions of the ceramic cores in actual use, leading to inaccurate performance evaluation of the ceramic cores, which may cause unqualified products to flow into subsequent production links.

[0004] Serious material waste: when problems are found in the later calibration, a large amount of material has been invested in probe assembly, and the discarded probes cause resource waste and cost increase;

[0005] Disordered data management: lacking effective unique identification and data binding, it is difficult to trace the detection 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 detection and calibration integrated system and method for diesel vehicle particulate matter sensor ceramic cores are proposed. SUMMARY

[0007] The present application aims to provide a special detection and calibration integrated system and method for diesel vehicle particulate matter sensor ceramic cores, to realize comprehensive and systematic detection of the diesel vehicle particulate matter sensor ceramic cores under normal temperature, high temperature and particulate matter environment, improve detection accuracy and ensure that the performance of the ceramic cores meets the requirements; by performing complete detection and calibration before the ceramic cores are assembled into probes and binding data with a unique traceable two-dimensional code, unqualified ceramic cores are screened out in advance, material waste is reduced, and production cost is lowered; a perfect data recording and tracing system for ceramic cores is established, which facilitates 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-mentioned purpose, the present application provides the following technical solutions:

[0009] The diesel vehicle particulate matter sensor ceramic core special detection calibration integrated system comprises a ceramic core, a test fixture, and a detection device.

[0010] The ceramic core is provided with a unique traceability two-dimensional code for identifying and associating detection data of the whole 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] Further, the detection device performs multi-working condition detection on the ceramic core under normal temperature, high temperature, high pressure, and particulate matter environment, and stores the detection data in association with the two-dimensional code.

[0014] The diesel vehicle particulate matter sensor ceramic core special detection calibration method comprises the following steps:

[0015] 1) Ceramic core identification: a unique traceability two-dimensional code is printed for each ceramic core.

[0016] 2) Test preparation: place the ceramic core on the test fixture and connect it, and turn on the detection device.

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

[0018] 4) High temperature detection: send a dew point start instruction, detect the IDE resistance value, heater resistance value, and temperature detector resistance value, and record the current temperature and all detection values.

[0019] 5) High pressure detection: send a test instruction to the ceramic core that has passed the normal temperature and high temperature detection, IDE pressurization 60V, and add a current limiting protector in the circuit.

[0020] 6) Particulate matter environment detection: install the ceramic core in a particulate matter atmosphere, record the resistance value, introduce high temperature gas and record the resistance value at different temperatures, and record a total of six groups of resistance data.

[0021] 7) Calibration: compare the six groups of resistance data with the standard ceramic core performance, fit the calibration curve, store the data in the data system in one-to-one association with the two-dimensional code, and determine whether it is qualified.

[0022] 8) Finished product assembly: scan the chip two-dimensional code when assembling the finished product, call the data, burn into the particulate matter controller, and complete the finished product assembly test.

[0023] Further, in step 4), the IDE resistance value, heater resistance value, and temperature detector resistance value at 800℃ are detected, and all detection values at 800℃ are recorded.

[0024] Further, the step 5) in the circuit is added with a current limiting protector, which protects after exceeding 30 muA.

[0025] Further, in the step 6), the ceramic core is installed in a 5mg / m³ particulate matter atmosphere, and the resistance values at 10s, 30s and 60s are recorded; after 60s, 100℃, 200℃ and 400℃ high-temperature gas is introduced, and the resistance values at different temperatures are recorded.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] The present application can detect the ceramic core at normal temperature, multi-parameters (IDE resistance, capacitance, heater resistance, temperature detector resistance), high-temperature (800℃) key parameter detection, and resistance value detection under different time points (10s, 30s, 60s) and different high-temperature gas (100℃, 200℃, 400℃) impact in particulate matter environment, simulating various working conditions of the ceramic core in actual work, and the detection results can better reflect the true performance;

[0028] The detection calibration is completed before assembly, and the defective products are screened out, so that the waste of probe materials caused by the discovery of unqualified ceramic cores after assembly is avoided, the production cost is effectively reduced, and the production benefit is improved;

[0029] A unique traceability two-dimensional code is given to each ceramic core, and the full-process detection data is bound to the two-dimensional code, so that the accurate traceability and efficient management of data are realized, the production process monitoring, quality problem traceability and process improvement analysis are facilitated, and the management level and quality stability of the entire production link are improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 It is a structural schematic diagram of the present application;

[0031] Fig. 2 It is a running process schematic diagram of the present application. DETAILED DESCRIPTION

[0032] 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. Embodiment 1:

[0033] Please refer to Figs. 1-2 The present application provides a technical solution:

[0034] The diesel vehicle particulate matter sensor ceramic core special detection and calibration integrated system comprises a ceramic core, a test fixture and a detection device.

[0035] The ceramic core is provided with a unique traceability two-dimensional code for identifying and associating detection data of the whole life cycle of the ceramic core. The ceramic core is placed in a test fixture, and the connector thereof is reliably connected to realize stable and accurate detection. The detection equipment is connected to the ceramic core, wherein the multi-working condition detection of normal temperature (including IDE resistance, capacitance, heater resistance, and temperature detector resistance detection), high temperature (IDE resistance, heater resistance, and temperature detector resistance detection at 800°C), high voltage (IDE pressurization of 60V with current limiting protection), and particulate matter environment (resistance value detection under different time and different high-temperature gas impact in a 5mg / m³ particulate matter atmosphere) is realized, and the detection data is bound and stored with the two-dimensional code.

[0036] The diesel vehicle particulate matter sensor ceramic core special detection calibration method comprises the following steps:

[0037] 1) Ceramic core identification: a unique traceability two-dimensional code is printed for each ceramic core. The two-dimensional code serves as the identity of the ceramic core and runs through the entire detection, calibration, assembly, and subsequent use process, and is used to record and query all data information related thereto;

[0038] 2) Test preparation: the ceramic core is placed on the test fixture and connected. The detection equipment is turned on to ensure that the connector of the ceramic core and the test fixture is reliably connected, so as to avoid inaccurate detection data due to poor contact. The detection equipment is started to enter the detection state, and a series of detection operations on the ceramic core are prepared;

[0039] 3) Normal temperature detection: IDE resistance value at normal temperature (professional detection instrument is used to detect IDE resistance value at normal temperature. Under normal circumstances, it should be an open circuit. If it is not an open circuit, it may indicate that the ceramic core has a short circuit fault and other problems. At the same time, the heater resistance value at normal temperature and the temperature detector resistance value at normal temperature are detected. By comparing the standard resistance value range, it is determined whether they are within the normal range to determine whether the initial performance of the heater and the temperature detector is qualified), IDE capacitance value (detecting IDE capacitance value at normal temperature, and evaluating 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, temperature detector resistance value, and the current temperature and all normal temperature detection values are recorded. The IDE resistance value, capacitance value, heater resistance value, temperature detector resistance value, and environment temperature of the ceramic core detected at the above normal temperature are stored and associated with the unique traceability two-dimensional code of the ceramic core for subsequent query and analysis;

[0040] 4) High temperature detection: Send dew point start command to make the internal environment of the detection device reach a specific dew point condition, and detect the IDE resistance value at 800°C, the heater resistance value at 800°C, and the temperature detector resistance value at 800°C under this condition. The changes of these parameters under high temperature environment can reflect the performance stability and reliability of the ceramic core under high temperature working condition, for example, the change of the heater resistance value under high temperature will affect its heating efficiency, the change of the IDE resistance value is related to the adsorption and reaction characteristics of the ceramic core to particulate matter, and the accuracy of the temperature detector resistance value is directly related to the accuracy of temperature measurement. Record the current temperature again (ensure that the temperature reaches 800°C and is stable), store and update the parameter data detected at 800°C together with the previous normal temperature data to the database associated with the ceramic core two-dimensional code, form the performance data chain of the ceramic core at different temperatures, and send test instructions to the ceramic core that passes the normal temperature and high temperature detection, and enter the next high pressure detection link;

[0041] 5) High pressure detection: Apply 60V voltage to the IDE, and connect a current limiting protector 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 damage to the ceramic core caused by excessive current. This step is mainly to test the insulation performance and resistance of the ceramic core under high voltage environment, to ensure that it will not fail due to overvoltage and overcurrent in actual work;

[0042] 6) Particulate matter environment detection: Install the ceramic core in a gas chamber that simulates the actual operating environment of a diesel vehicle and contains 5mg / m³ particulate matter. Detect the resistance value of the ceramic core at 10s, 30s, and 60s respectively. As time goes on, the ceramic core surface will adsorb particulate matter, and its resistance value will change accordingly. By detecting the resistance value at different time points, the adsorption rate and sensitivity of the ceramic core to particulate matter can be evaluated. After 60s, 100°C, 200°C, and 400°C high temperature gas is introduced in turn. The resistance value of the ceramic core is continuously detected during the introduction of high temperature gas, and the six groups of resistance data (including 10s, 30s, 60s, and the resistance values when 100°C, 200°C, and 400°C high temperature gas is introduced) are recorded. The introduction of high temperature gas will cause the particulate matter adsorbed on the surface of the ceramic core to react, such as oxidation, thereby further changing the resistance value of the ceramic core. These data can comprehensively reflect the performance change characteristics of the ceramic core under particulate matter environment and different temperature shocks;

[0043] 7) Calibration: Compare and analyze the six groups of resistance data of the measured ceramic core in the particulate matter environment and at different temperatures with the performance data of the standard ceramic core. If the performance data of the ceramic core deviates from the standard curve within the allowable range, it is determined that the ceramic core is calibrated and qualified. If the deviation exceeds the range, it is determined as a defective product;

[0044] 8) Final assembly: when assembling the final product of the diesel particulate sensor, first scan the two-dimensional code of the ceramic core, call the previously stored detection calibration data from the data system, and then accurately burn these data into the particulate controller. In this way, when the final product sensor is installed on the vehicle, the controller can accurately control and monitor according to the actual performance parameters of the ceramic core, improve the working performance and reliability of the entire sensor, and at the same time complete the final assembly test link, ensuring the quality consistency and stability of the final product.

[0045] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are only by way of example and that changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined in the following claims, in which:

Claims

1. A dedicated integrated detection and calibration system for ceramic cores of particulate matter sensors in diesel vehicles, characterized in that, Includes ceramic cores, test fixtures, and testing equipment; The ceramic core is equipped with a unique traceability QR code for identifying and associating testing data throughout the entire lifecycle of the ceramic core; The ceramic core is placed inside the test fixture; The testing equipment is connected to a ceramic core; The testing equipment performs multi-condition testing on the ceramic core under normal temperature, high temperature, high pressure and particulate matter environments, and stores the test data in conjunction with a QR code. Normal temperature operating condition testing includes IDE resistance, IDE capacitance, heater resistance, and temperature sensor resistance testing; High-temperature operating condition testing: IDE resistance, heater resistance, and thermometer resistance testing at 800℃; High-voltage operating condition testing: IDE voltage applied at 60V with current limiting protection; Resistance values ​​were measured under different times and high-temperature gas impacts in a particulate matter environment with a particulate matter concentration of 5 mg / m³.

2. A dedicated testing and calibration method for ceramic cores of particulate matter sensors in diesel vehicles, characterized in that, Includes the following steps: 1) Ceramic core identification: A unique traceability QR code is printed on each ceramic core; 2) Test preparation: Place the ceramic core on the test fixture and connect it, then turn on the testing equipment; 3) Room temperature detection: Detect the room temperature IDE resistance value, IDE capacitance value, heater resistance value, and thermometer resistance value, and record the current temperature and all room temperature detection values; 4) High temperature test: Send dew point start command, detect IDE resistance value, heater resistance value, thermometer resistance value, record the current temperature and all detected values, send test command for ceramic cores that pass both room temperature and high temperature tests, and proceed to the next high voltage test stage. 5) High-voltage testing: For ceramic cores that pass both room temperature and high temperature tests, a test command is sent, IDE voltage is applied at 60V, and a current limiting protector is added to the circuit; 6) Particulate matter environmental monitoring: The ceramic core is installed in a particulate matter atmosphere, and the resistance value is recorded. High-temperature gas is introduced and the resistance value is recorded at different temperatures. A total of six sets of resistance data are recorded. 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 one by one with the QR code, and 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 particulate matter controller, and complete the finished product assembly test.

3. The method for testing and calibrating a ceramic core for a diesel vehicle particulate matter sensor according to claim 2, characterized in that: In step 4), the resistance values ​​of the IDE, heater, and thermometer at 800℃ are detected, and the current temperature and all detected values ​​at 800℃ are recorded. The changes in parameters under high temperature conditions can reflect the performance stability and reliability of the ceramic core under high temperature conditions.

4. The method for testing and calibrating a ceramic core for a diesel vehicle particulate matter sensor according to claim 2, characterized in that: In step 5), a current limiting protector is added to the circuit to protect against overcurrent exceeding 30μA, preventing damage to the ceramic core. This is done to test the insulation performance and withstand capability of the ceramic core under high voltage conditions and to ensure that it will not fail due to overvoltage or overcurrent in actual operation.

5. The method for testing and calibrating a ceramic core for a diesel vehicle particulate matter sensor according to claim 2, characterized in that: In step 6), the ceramic core is installed in a 5 mg / m³ particulate atmosphere, and the resistance values ​​are recorded at 10s, 30s, and 60s. After 60s, high-temperature gases at 100℃, 200℃, and 400℃ are introduced, and the resistance values ​​at different temperatures are recorded.

Images