How to Test Vehicle Exhaust Emissions?
1 Answers
There are three methods for testing exhaust emissions: 1. Method One: Simple Transient Driving Mode. The equipment for this method mainly includes a chassis dynamometer, exhaust sampling system, five-gas analyzer, gas flow analyzer, and automatic detection control system. The 'Simple Driving Mode' test simulates on-road driving conditions with load, covering various operating conditions such as acceleration, deceleration, constant speed, and idling, accurately reflecting the exhaust emission characteristics during actual driving. The transient driving mode can overcome the inability of other methods to detect oxygen sensor faults in fuel-injected vehicles, thereby improving the detection of exhaust emission defects. It can measure three pollutants: carbon monoxide, hydrocarbons, and nitrogen oxides. 2. Method Two: Filter Paper Smoke Method. This method involves running a diesel engine at idle speed, rapidly pressing the accelerator pedal to the floor, 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. 3. Method Three: Diesel Vehicle Loaded Deceleration LUGDOWN Method. This method tests smoke levels at three load conditions: maximum power point, 90% of the maximum power corresponding speed, and 80% of the maximum power corresponding speed. During the test, the sampling probe is inserted into the vehicle's exhaust pipe to a depth of at least 400mm. The test data includes wheel power, engine speed, and exhaust smoke level.
