An emission test cycle is a protocol contained in an emission
standard to allow repeatable and comparable measurement of exhaust
emissions for different engines or vehicles. Test cycles specify the specific
conditions under which the engine or vehicle is operated during the emission
test. There are many different test cycles issued by various national and
international governments and working groups. Specified parameters in a test
cycle include a range of operating temperature, speed, and load.
Ideally these are specified so as to accurately and realistically represent the
range of conditions under which the vehicle or engine will be operated in actual
use. Because it is impractical to test an engine or vehicle under every
possible combination of speed, load, and temperature, this may not actually be
the case. Vehicle and engine manufacturers may exploit the limited number of
test conditions in the cycle by programming their engine management systems to
control emissions to regulated levels at the specific test points contained in
the cycle, but create a great deal more pollution under conditions experienced
in real operation but not represented in the test cycle. This results in real
emissions higher than the standards are supposed to allow, undermining the
standards and public health.
Application
Emission test cycles are typical tests for research and
development activities on engines at automobile OEMs.
The commonly used hardware platforms therefore are:
The commonly used hardware platforms therefore are:
- engine test stand - for just a single engine
- vehicle test stand (also "chassis dynamometer" or "chassis dyno" or "emission dyno") - for the complete car with engine
- ASM Test - Accelerated Simulation Mode: (California inspections) Vehicles tested at 15 MPH & 25 MPH where vehicle undergoes a load.
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