What are the testing methods and standards for vehicle exhaust emissions?
1 Answers
Exhaust emission testing methods are as follows: Simple Transient Driving Mode Method: The equipment for the Simple Transient Driving Mode Method mainly includes a chassis dynamometer, exhaust sampling system, exhaust gas analyzer, gas flow analyzer, and automatic detection control system. The 'Simple Driving Mode Method' test simulates the load conditions of a vehicle on the road, covering various driving conditions such as acceleration, deceleration, constant speed, and idling, accurately reflecting the actual exhaust emission characteristics of the vehicle during driving. Filter Paper Smoke Method: The Filter Paper Smoke Method involves setting the diesel engine to idle, rapidly pressing the throttle to the maximum, maintaining it for 4 seconds, and then releasing it. Under this condition, carbon smoke from a specified length of exhaust column is extracted from the exhaust pipe, and the degree of blackening of a clean filter paper is determined using a photoelectric method. Automotive environmental exhaust emission testing standards: The limit for carbon monoxide is 6.3g/km, and the total limit for hydrocarbons and nitrogen oxides is 2.0g/km. Vehicle exhaust emission testing is based on whether the smoke opacity value meets the standards, and whether the emissions meet the standards is primarily determined by vehicle testing data, with the smoke opacity value confirming compliance.
