Development Of NO_x Sensor Chip Aging Device

Nitrogen oxygen sensor is mainly used to measure the concentration of NO_x in automobile exhaust, which can provide the basis for the injection quantity of urea solution in the SCR post processing system, so that the NO_x content in the automobile exhaust gas can reach the national emission standard. Hubei Dan Rui new material limited company need to detect the chip in the production process of nitrogen and oxygen sensor chip. Aging test is essential to the detection process. Aging test need NO_x sensor chip aging device, which is concerned in this paper.The problems of nitrogen oxygen sensor chip easily exposed in the first use of a few hours to dozens of hours. In order to eliminate the unqualified chips, the chip aging(simulation heating) for a period of time is essential. In addition, the experimental results show that the chip for a period of time after the aging voltage cycle heating, nitrogen oxygen sensor chip measurement stability will be improved. Therefore, for the production of nitrogen and oxygen sensor chip obtained stable working performance, in nitrogen and oxygen sensor chip factory need the heat aging test, and has not appeared in our country can be used in the production of nitrogen and oxygen sensors chip to realize the bulk of the aging and thermal test equipment.The heating layer and the electrochemical layer of the nitrogen oxygen sensor chip must have good insulation, otherwise the leakage current between the heating layer and the electrochemical layer will affect the accuracy of the measurement. The aging device of the nitrogen oxygen sensor chip can judge the reliability of the insulation layer of the chip by detecting the leakage current between the heating layer and the electrochemical layer, thereby screening the chip which is not up to the standard. In addition, the device is in the process of aging by measuring the heating current of the chip heating electrode, can be completed on the chip heating electrode detection, thereby eliminating the heating electrode is not qualified chip. The quality detection of the nitrogen oxygen sensor chip is another function of the aging device of the nitrogen oxygen sensor chip.The research direction of this paper is: design a set of automatic nitrogen oxygen sensor chip to apply cycle heating aging voltage, and real-time recording of heating current and leakage current of nitrogen oxygen sensor aging device system. The design of nitrogen oxygen sensor chip aging device mainly includes: the software part, the mechanical part, the hardware part.