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A CATI PEMS being strapped down inside a vehicle. A portable emissions measurement system (PEMS) is a vehicle emissions testing device that is small and light enough to be carried inside or moved with a motor vehicle that is being driven during testing, rather than on the stationary rollers of a dynamometer that only simulates real-world driving.
Vehicle emissions control is the study of reducing the emissions produced by motor vehicles, especially internal combustion engines. The primary emissions studied include hydrocarbons, volatile organic compounds, carbon monoxide, carbon dioxide, nitrogen oxides, particulate matter, and sulfur oxides.
California's Low-emission vehicle (LEV) program defines six automotive emission standards which are stricter than the United States' national Tier regulations. Each standard has several targets depending on vehicle weight and cargo capacity; the regulations cover vehicles with test weights up to 14,000 pounds (6,400 kg).
In fact, these points depend on vehicle unique parameters as weight, torque map, specific power and engine speed. [5] During the WLTP the impact of the model’s optional equipment is also considered. In this way the tests reflect better the emissions of individual cars, and not just the one with the standard equipment (as it was for the NEDC ...
Carbon monoxide sensors are used to assess the CO amount during an Ministry of Transport test. [1] In order to be used for such test it must be approved as suitable for use in the scheme. In the UK, a list of acceptable exhaust gas analysers for use within the MOT test is available via the Driver and Vehicle Standards Agency website. [2]
On-board diagnostics (OBD) is a term referring to a vehicle's self-diagnostic and reporting capability. In the United States, this capability is a requirement to comply with federal emissions standards to detect failures that may increase the vehicle tailpipe emissions to more than 150% of the standard to which it was originally certified. [1] [2]
Aggressive throttle movements, engine speed changes, and engine motoring are characteristics of most transient engine tests. The usual purpose of these tests are vehicle emissions development and homologation. In some cases, the lower-cost eddy-current dynamometer is used to test one of the transient test cycles for early development and ...
Because the vehicle is secured to the chassis dynamometer, it prevents variables such as wind resistance to alter the data set. The chassis dynamometer is designed to add the sum of all the forces that are applied to a vehicle when driven on an actual road course to be simulated through the tires and calculated in the test results.
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