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Automobile exhaust detection method and characteristics
2024-10-12
With the rapid development of economy, the number of urban cars has increased rapidly, and the consequent problem of automobile exhaust pollution has a great impact on people's lives, which has attracted the attention of the relevant departments of the state. A series of policies and regulations have been issued to strengthen the detection of automobile exhaust and strictly control automobile exhaust emissions. So...Detection of automobile exhaustWhat are the methods? What are the characteristics of each?
2. Double idle speed method:
It refers to the method of detecting pollutants when the car is refueled to high and low speeds under neutral conditions. According to the emission conditions of the two working conditions, the vehicle emission conditions can be basically reflected, and the fuel control situation can be basically judged according to the excess air coefficient at high idle speed. Disadvantages: can only be detectedThe concentration of HC and CO cannot be detected for NOx emissions.
2. Steady-state working condition method:
Using the measurement results to evaluate the emission performance of in-use vehicles can reflect the pollution status of vehicles relatively truly. However, in the actual operation of the vehicle, the road load is often changed. Compared with the double idle speed method, it is a loading test method and can distinguishNOx emissions, the identification of high-emission vehicles is better than dual idle. Advantage: The emission concentration of NOx can be detected. Disadvantages: Only the concentration of pollutants can be detected, and the total amount of pollution emissions from vehicles cannot be detected.
3. Transient working condition method:
Consistent with the new car experiment, accurate measurement and effective detectionNOx emissions. Advantages: high technical content, good correlation, low misjudgment rate. Disadvantages: Due to the high level of personnel business, high equipment cost, complex maintenance and can not be widely used.
4. Simple transient working condition method:
When testing, simulate the working condition and adopt the driving curve of variable speed and variable load. Most importantly, the method uses a method calledThe "gas flow analyzer" device measures the exhaust flow of the car (diluted), and after processing and calculation, the final emission quality of each pollutant per kilometer can be obtained. Advantages: It can reflect the emission characteristics of the vehicle during actual driving, has a high correlation with the detection of new cars, has high detection accuracy, and can obtain the mass concentration of vehicle pollutant emissions.
5. Loading deceleration method:
Environmental detection method for diesel vehicles in use by the loading deceleration method. This method can reflect the output power of diesel engine and eliminate the cheating of oil limit in the detection process. The light absorption coefficient value reflected in the diesel vehicle load and the full load condition of the diesel engine. Disadvantages: It cannot reflect the smoke of the accelerated process and the smoke of the low-speed process of the supercharged diesel engine, and the equipment is complex and the cost is high, so it is difficult to promote.
6. Free acceleration method:
The free acceleration method is an environmentally friendly detection method. This is the basic method for smoke detection of diesel vehicles. The equipment is simple and easy to operate. It can especially reflect the smoke emission status of supercharged diesel engines. It is an ideal method for smoke detection of diesel engines. The method used. Disadvantages: it can not reflect the power size, the owner is more likely to cheat by limiting the oil.
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