What are the regulations for diesel vehicle annual inspections?

[OElliott]

Particulate matter and nitrogen oxides must meet the required range. The main differences between diesel vehicle annual inspections and gasoline vehicle annual inspections are as follows: 1. Exhaust emissions: The emission limit for diesel has been reduced from the original 1.5m-1 to 1.2m-1. Diesel exhaust testing mainly includes the free acceleration method and the loaded deceleration method. The free acceleration method only requires stepping on the floor pedal a few times in neutral gear, which is convenient and quick, with less engine effort. The loaded deceleration method is relatively more complicated, requiring the drive wheels to be placed on the dynamometer rollers and accelerated to a specified power point at the prescribed speed and RPM for testing. The emission limit for gasoline exhaust pollutants has been reduced by 30%. 2. Performance: Diesel vehicle annual inspections have added testing record items and software requirements. 3. Emissions: According to the relevant provisions of the newly revised standards, diesel vehicles, construction machinery, agricultural machinery, etc., that emit visible smoke can be considered to have exceeded emission standards.