Exhaust emissions from motor vehicles are one of the most important factors in the production of haze. On August 1 this year, Chengdu used the simple working condition method to detect the exhaust of motor vehicles. What is the effect? The reporter recently learned from the Municipal Environmental Protection Bureau that so far, a total of 6,046 vehicles have passed the working condition method for exhaust gas testing, laying a good foundation for its official full operation. Screw Head,Screw Tip,Screw Head Types,Injection Molding Machine Accessories ZHOUSHAN HONGTUO COMPANY , https://www.hongtuoscrew.com
One month to test 6046 vehicles, the main components of the vehicle exhaust are water and carbon dioxide, followed by carbon monoxide, hydrocarbons, nitrogen oxides, soot particles, sulfur oxides, and trace amounts of benzene, aldehydes, phenols, peroxides, organic Contaminants such as acid. Among them, hydrocarbons and nitrogen oxides are one of the factors that cause photochemical pollution. Fine particles (PM2.5) in airborne particles are important factors for the formation of haze.
With a higher standard for detecting exhaust gas, from August 1 this year, Chengdu began to use the simple working condition method to detect vehicle exhaust, and 10 of the city's 25 inspection stations participated in the trial operation. The relevant person in charge told the reporter that the simple working condition method is a dynamic method for detecting exhaust pollutants of loaded vehicles, placing the vehicle under test on the chassis dynamometer to simulate road running resistance, after idle speed, acceleration, uniform speed and deceleration, etc. Various test conditions, detecting the pollutant content emitted by the motor vehicle, close to the actual discharge status of the motor vehicle. The detection includes the steady state operation method of the gasoline vehicle, the transient working condition method and the simple transient working condition method, and the diesel vehicle loading deceleration method.
The reporter learned that during the one-month trial run, a total of 6,046 vehicles (224 daily inspections) were detected using the working conditions method, which were 5,636 gasoline vehicles and 410 diesel vehicles. The relevant person in charge told the reporter that the trial operation can timely discover and improve the shortcomings of the new system of simple working conditions, optimize the software flow, shorten the detection time and facilitate the detection as much as possible; at the same time, the proficiency of the new method is gradually improved. It laid a good foundation for the formal operation of the working conditions law. “The existing exhaust gas detection work was not affected during the trial run of the new method.â€
More stringent than the current double idle method. Is the simple working condition different from the traditional double idle method? The relevant person in charge said that the working condition method is to simulate the driving condition of the road, and the double idle speed method is to detect the exhaust emission of the vehicle under no load and at rest. Therefore, the test result of the working condition method is more objective and true. At the same time, the working condition method is relatively complete. In addition to the carbon monoxide and hydrocarbons detected by the old method, the emission of nitrogen oxides can be detected. In addition, the simple control method is more advanced and controlled by computer software. Operation can avoid the influence of human factors on the test results, and can upload the test process data and video images in real time, and dock with the intelligent system of the management department to make the test more fair.
It can be seen that the simple working condition method detection is more strict and scientific than the current detection method, which is conducive to the scientific supervision and management of the environmental protection periodic inspection of motor vehicles, which is conducive to accurately grasping the pollutant discharge status of various types of motor vehicles and is conducive to promoting Motor vehicle NOx emission reduction, improving vehicle emission compliance rate, reducing air pollution, and providing a basis for scientifically setting environmental protection policies and plans.