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Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue [3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water .
EMD was required to monitor fuel delivery, exhaust gas recirculation, the diesel particulate filter (on diesel engines), and emissions-related powertrain control module inputs and outputs for circuit continuity, data rationality, and output functionality. EMD+ was used on model year 2010-2012 California and Federal petrol-engined vehicles with ...
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.
The dieselgate emissions scandal first surfaced against Volkswagen in 2015, when the company admitted around 11 million cars worldwide were fitted with defeat device software, which tricks ...
A Data Acquisition and Handling System (DAHS) receives the signal output from each analyzer in order to collect and record emissions data. [6] Another sample extraction method used in industrial sources and utility sources with low emission rates, is commonly referred to as a "dry extractive", "hot dry" extractive, or "direct" CEMS.
A NO x adsorber is designed to reduce oxides of nitrogen emitted in the exhaust gas of a lean burn internal combustion engine.Lean burn engines, particularly diesels, present a special challenge to emission control system designers because of the relatively high levels of O 2 (atmospheric oxygen) in the exhaust gas.
Emissions from diesel vehicles are more harmful than those from petrol vehicles. [40] [41] [42] Diesel combustion exhaust is a source of atmospheric soot and fine particles, which is a component of the air pollution implicated in human cancer, [43] [44] heart and lung damage, [45] and mental functioning. [46]
Soot and other particles from diesel engines worsen the particulate matter pollution in the air and are harmful to health. [8] New particulate filters can capture from 30% to greater than 95% of the harmful soot. [9] With an optimal diesel particulate filter (DPF), soot emissions may be decreased to 0.001 g/km or less. [10]