System for testing performances of oxygen sensor by adopting multi-path gas distribution to simulate automobile exhaust environment

Abstract

The invention relates to a system for testing performances of an oxygen sensor by adopting multi-path gas distribution to simulate an automobile exhaust environment. The system comprises a gas supply device, a gas distribution device, a temperature control device, a testing chamber, an exhaust processing device, a water steam device and a measurement control device, wherein the gas supply device, the gas distribution device, the temperature control device, the testing chamber and the exhaust processing device are connected to one another in sequence through pipelines, the measurement control device is connected with the gas distributing device and the temperature control device respectively, and the water steam device is connected with the temperature control device. Compared with the prior art, the system has the advantages of high accuracy in exhaust control, quickness in gas responding speed, controllability for temperature setting, variety in testing functions, high testing efficiency and the like.

Description

technical field [0001] The invention relates to an oxygen sensor performance test system, in particular to an oxygen sensor performance test system for simulating the exhaust gas environment of automobiles through multi-channel gas distribution. Background technique [0002] With the rapid development of the automobile industry, the pollution caused by automobile exhaust has attracted the attention of the whole world. All countries in the world have formulated more and more stringent exhaust emission standards to control environmental pollution. However, in automobile fuel engines, once the air-fuel ratio of the fuel mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply, and more exhaust pollution will be generated. Therefore, it is very necessary to install an oxygen sensor in the exhaust pipe to realize precise control of the air-fuel ratio of the vehicle. The performance of the oxygen...

AI Technical Summary

Problems solved by technology

[0004] 1. The control accuracy of exhaust gas components is seriously insufficient, and the concentration of various components in the generated exhaust gas is difficult to determine

Even if the corresponding exhaust gas composition and concentration are obtained through a gas analyzer, it is difficult to carry out precise control according to actual needs;

[0005] 2. Exhaust gas temperature cannot be precisely controlled

The way the engine works and burns is a sharp exothermic reaction, and the reaction heat release is inconsistent under rich and lean states, so it is difficult to stabilize the working environment temperature of the sensor in the actual test process, and it is impossible to make a prediction on the performance of the sensor. accurate assessment

[0006] 3. The oxygen that participates in the combustion reaction comes from the air, and the oxygen content in the air changes with time and site, which makes the air-fuel ratio calculated by the flow rate have errors, and further reduces the control accuracy of the oxygen content of the tail gas;

[0007] 4. In the design of related oxygen sensor performance test system disclosed in the existing patent literature, the control of the exhaust gas lambda value is relatively insufficient, and there are only two states of rich combustion and lean combustion

[0008] 5. The relevant oxygen sensor performance test device disclosed in the existing patent literature has a relatively single test function, and cannot complete the test of the influence of a single gas on the performance of the oxygen sensor, let alone special tests of European and American standards.

[0009] In summary, the relevant oxygen sensor performance testing devices disclosed in the existing patent documents can no longer meet the more stringent oxygen sensor performance testing standards in terms of structural design and functional design.

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