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According to a study commissioned by the Washington, DC-based Propane Education & Research Council (PERC), NO x emissions measured from propane autogas school buses were substantially lower than those measured from diesel school buses. For the stop-and-go route, NO x emissions were 34 times higher for the diesel school bus.
The transient results illustrate the gradual formation of the nucleation mode particles with continuous increase in exhaust temperatures. Diesel particulate filters (DPF) and urea-based selective catalytic reduction (SCR) exhaust after-treatment systems thus have emerged as feasible strategies to meet the 2010 USEPA regulations.
In-use testing of three light duty diesel vehicles—certified to US-EPA Tier2-Bin5 and California LEV-II ULEV emissions limits— found a wide variation in real world emissions performance relative to the regulatory limits. diesels and one 3.0L diesel) over pre-defined test routes exhibiting diverse driving conditions.
In a new study, a team from UCLA, with colleagues from the California Air Resources Board (ARB) and WestVirginia University, measured total particle number emission factors (PNEFs) from six newly certified heavy-duty vehicles (HDVs) powered by diesel and CNG totaling over 6,800 miles of on-road operation in California.
liter, four-cylinder diesels include software (a “defeat device”) that circumvents EPA emissions standards for NO x. The allegations cover roughly 482,000 diesel passenger cars sold in the United States since 2008. Affected diesel models include: Jetta (Model Years 2009 – 2015). collectively referred to here as Volkswagen).
Volkswagen AG has agreed with the US government to resolve criminal and federal environmental and other civil claims against the company relating to the diesel emissions cheating débâcle. The Supervisory Board directed the law firm Jones Day to share all findings of its independent investigation of the diesel matter with the DOJ.
WestVirginia University Research Corporation. valve faces, piston crowns, and exhaust ports) to improve fuel economy. Develop advanced solutions for Class 7 and Class 8 heavy‐duty vehicles that eliminates or mitigates the negative effects of current dieselexhaust after‐treatment equipment systems on dual fuel trucks.
On-road NO x emission levels of Euro 6 diesel cars in Europe are on average about seven times higher than the NO x limit set by the Euro 6 emission standard, according to a new report published in Berlin by the International Council on Clean Transportation (ICCT). Diesel vehicles make up about 50% of all new cars in the EU.
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