Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2024. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ Signal synchronization methods when measuring tailpipe emissions with PEMS https://trid.trb.org/View/2350947 25 %) were observed. Those differences depend directly on the physical setup of the PEMS. The dynamic correlation method exhibited the best performance in all cases. When using this method, we recommend to synchronize the CO₂ mass flow and fuel consumption variables first and then adjust the obtained synchronization to other species to account for differences in species diffusivities.]]> Wed, 20 Mar 2024 17:08:54 GMT https://trid.trb.org/View/2350947 Real-World Emissions from Diesel Passenger Cars During Peak and Off-Peak Periods https://trid.trb.org/View/1974555 Mon, 11 Dec 2023 16:40:47 GMT https://trid.trb.org/View/1974555 In-use NOₓ and black carbon emissions from heavy-duty freight diesel vehicles and near-zero emissions natural gas vehicles in California's San Joaquin Air Basin https://trid.trb.org/View/2287376 70 % of black carbon and NOₓ were emitted within disadvantaged communities, characterized by low-income minority populations.]]> Tue, 28 Nov 2023 10:27:32 GMT https://trid.trb.org/View/2287376 Novel insights into the NOx emissions characteristics in PEMS tests of a heavy-duty vehicle under different payloads https://trid.trb.org/View/2288534 Tue, 21 Nov 2023 17:08:20 GMT https://trid.trb.org/View/2288534 A combined framework of Biplots and Machine Learning for real-world driving volatility and emissions data interpretation https://trid.trb.org/View/2256859 Thu, 26 Oct 2023 16:03:20 GMT https://trid.trb.org/View/2256859 Emission factors and fuel consumption of CNG buses in real driving conditions https://trid.trb.org/View/2070890 Fri, 16 Dec 2022 09:41:08 GMT https://trid.trb.org/View/2070890 Are we getting vehicle emissions estimation right? https://trid.trb.org/View/2047787 Mon, 31 Oct 2022 10:21:47 GMT https://trid.trb.org/View/2047787 A fuel-consumption based window method for PEMS NOx emission calculation of heavy-duty diesel vehicles: Method description and case demonstration https://trid.trb.org/View/2042555 50% valid windows are quite similar for WBW and FBW methods. The estimation accuracy of average power ratio for the FBW method depends on the value of transmission efficiency of vehicle driveline. The deviations of 90% specific NOx emission in mg/kW.h between the two methods are smaller than 6% for the cases investigated in the present work.]]> Thu, 27 Oct 2022 09:18:12 GMT https://trid.trb.org/View/2042555 Towards tailpipe sub-23 nm solid particle number measurements for heavy-duty vehicles regulations https://trid.trb.org/View/2010420 10 nm, were compared with references systems (i.e. LABS from PFDS). One compressed natural gas (CNG) engine, and three diesel engines, all Euro VI step E, with or without urea injection, and with or without crankcase ventilation connected to the tailpipe, challenged the systems with different emission levels and particle sizes and properties. The results showed that the differences of the LABS to the references were in most cases within ±25%, with a few exceptions. The PEMS were within ±50%. There was no or small effect on the differences from engine technology, urea injection or crankcase ventilation. The inclusion of sub-23 nm particles increased 100% to 250% the particle number emissions. The urea injection increased the >10 nm emissions 300–600% (2–5 × 1010 p/kWh). Connecting the crankcase ventilation to the tailpipe further increased the >10 nm particle number emissions 340–560% (1.4–2.5 × 1011 p/kWh), bringing the >10 nm levels of the engines to approximately half of the current particle number limit, applicable to particles >23 nm.]]> Wed, 21 Sep 2022 09:23:14 GMT https://trid.trb.org/View/2010420 Real-world emission characteristics of an ocean-going vessel through long sailing measurement https://trid.trb.org/View/1958996 Mon, 25 Jul 2022 11:52:32 GMT https://trid.trb.org/View/1958996 Assessing light flex-fuel vehicle emissions with ethanol/gasoline blends along an urban corridor: A case of Fortaleza/Brazil https://trid.trb.org/View/1944259 Mon, 27 Jun 2022 17:16:32 GMT https://trid.trb.org/View/1944259 Investigation of real operation gaseous emissions from a diesel locomotive https://trid.trb.org/View/1984091 Thu, 23 Jun 2022 09:16:39 GMT https://trid.trb.org/View/1984091 Validation of a Line-Haul Class 8 Combination Truck https://trid.trb.org/View/1821969 Fri, 17 Jun 2022 09:20:14 GMT https://trid.trb.org/View/1821969 A Study on Emission Measurement Method by Using Intermittent Sampling for Real Driving Emissions of Gasoline Passenger Vehicles, Including Hybrid Electric Vehicles and Plug-in Hybrid Electric Vehicles https://trid.trb.org/View/1937263 Tue, 31 May 2022 09:17:31 GMT https://trid.trb.org/View/1937263 Real-world emission factors for SUVs using on-board emission testing and geo-computation https://trid.trb.org/View/1953324 Thu, 26 May 2022 09:48:49 GMT https://trid.trb.org/View/1953324