VMAS Simple Transient Mode Method Features
The simple transient condition test method for exhaust pollutants of motor vehicles (abbreviated as VMAS) is the use of automobile chassis dynamometers and other equipment to simulate the car’s actual driving conditions on the road on a rotating drum test bench to exhaust the vehicle’s exhaust. One of the methods used for testing is an advanced and scientific testing technique. It is one of the methods recommended by the GB18285-2005 standard. It is the highest level of detection technology currently, and it is also a type of detection currently used by various provinces and cities. the way. Using this detection method is conducive to scientifically controlling the exhaust pollution of motor vehicles and further improving the quality of the ambient air. Protect the people's health.
Main features of VMAS detection method
●Simple transient method is a test method with load. The test result can reflect the actual discharge status of the vehicle on the road. It is a scientific, advanced and practical test method. Compared with the currently used double idle detection method, it has a low miscarriage rate, can effectively prevent the adjustment of cheating behavior, and can also detect the NOx emissions of the vehicle, which can provide more scientific and objective monitoring for vehicles in use. The basis.
● The simple transient method uses the VMAS195 test method: that is, acceleration, deceleration, idle speed, and constant speed are included in the detection process within 195 seconds. There are many similarities between the test results and actual conditions.
● VMAS detection system is a test system based on the emission quality of automotive pollutants, expressed in g/km. The quality emission test can directly obtain the total number of grams of vehicle pollutants emitted, which can more accurately simulate the actual working conditions of the vehicles, help to summarize the emission factors, and more objectively and fairly judge the emissions of the vehicles. The train pollution control plan has practical significance.
VMAS transient condition method vehicle exhaust detection system configuration
1. Chassis dynamometer
2. Gas exhaust analyzer
3, gas flow analyzer
4, computer control system and printer
5, LCD monitor (driver assistance)
