How to Determine the Test Results of Gasoline Vehicles?
2 Answers
There are four methods to determine the test results of gasoline vehicles, namely double idle speed, transient condition method, simple transient condition method, and steady-state condition method. The following is a related introduction about exhaust gas testing: 1. Introduction: On-site or operational test bench analysis and measurement of the composition and concentration of exhaust gases emitted by motor vehicles during idle or operating conditions. 2. Added items: Gasoline vehicles have added fuel evaporation testing and other contents; pollutant emission limits have been adjusted. Diesel vehicles have added nitrogen oxide emission limits and measurement methods, and adjusted soot emission limits; requirements regarding compression ignition engines and new vehicle type approvals have been removed.
As a car owner who frequently takes my vehicle for annual inspections, the evaluation of gasoline vehicles mainly focuses on several key areas: exhaust emissions, lighting, brakes, and engine condition. During the specific evaluation process, inspection stations use professional equipment to measure the CO and HC levels in the exhaust. If these exceed the national standard limits, the vehicle fails the test. They also check for any warning codes in the OBD system. For safety, the braking distance must fall within a certain range to be considered normal, and the brightness of the lights cannot be too low, otherwise, it’s unsafe. My old car once failed due to a clogged catalytic converter causing excessive emissions, and it only passed after repairs and a second inspection. Regular maintenance, such as changing the engine oil, cleaning the intake system, and checking tire wear periodically, increases the chances of passing the inspection. A failed result means the car cannot be driven legally and may incur fines, which is quite troublesome. In short, the evaluation is an automated process where the equipment has the final say.
