For heavy-heavy duty diesel (HHDD) vehicles, higher emissions were estimated using MOVES for all pollutants except for NH3 when compared to MOBILE6.2. The largest difference between the two models was seen in PM10 and PM2.5. The second part of this dissertation focused on driving cycles for HHDD vehicles in hilly terrain and its effect on
Liming · Medium and Heavy Duty Trucks with a Fuel Cell Emphasis . Chad Hunter, Michael Penev, Evan Reznicek. National Renewable Energy Laboratory. May 31, 2020. DOE Hydrogen and Fuel Cells Program 2020 Annual Merit Review and Peer Evaluation Meeting. This presentation does not contain any proprietary, confidential, or otherwise restricted information
Liming · targets, trucks will need to become zero-emission. One technology that could deliver this is the battery electric truck. This paper looks at the potential of battery electric heavy duty trucking in the EU, in particular for the more difficult long haul segment, by analyzing the technical feasibility, regulatory and
Liming · Following the duty cycle analysis are five representative driving cycles in each vocation—the cycle that is most representative from the DTR approach, the cycle with the maximal energy consumption, the cycle with the maximal power-weighted work, the cycle with the maximal percentage of high speed (over 88 km/h), and the cycle with the minimal
Liming · a new regulatory system to improve the fuel efficiency of medium- and heavy-duty trucks. Two years were allotted from the beginning of the NAS study for both studies to be completed. The NAS study was made public on March 31, 2010, and the NHTSA study was designated for completion by the end of September 2010.
Liming · A Study of the Rankine Cycle Generating System for Heavy Duty HV Trucks
Liming · Besides standardized driving cycles used for regulatory purposes, there are many others that characterize the driving in specific areas (Esteves-Booth et al., 2001) or a particular technology (Rapone et al., 2000).From the EF development perspective, the so-called real-world cycles provide the most valuable emissions data thanks to a wider coverage of engine …
test cycles. FTP (Federal Test Procedure) is a transient dynamometer cycle used for emission certification testing of heavy-duty diesel engines in the USA. It includes segments designed to simulate both urban and freeway driving. The European regulations are still being tested with the old steady state cycle, called ECE, but for Euro3,
Liming · In heavy duty (HD) trucks cruising on expressway, about 60% of input fuel energy is wasted as losses. So it is important to recover them to improve fuel economy of them. As a waste heat recovery system, a Rankine cycle generating system was selected. And this paper mainly reports it.In this study, e
Liming · heavy-duty vehicles. A large amount of fuel can be saved by small improvements in FE. Heavy-Duty Diesel Truck Test Schedules In characterizing the FE from heavy-duty vehicles, it is essential that the vehicle is tested or simulated under typical in-use behavior. In this . study, several cycles which cover a wide range of driving conditions were
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Liming · Medium- and Heavy-Duty EV Data Collection Foothill Transit EV 12 Proterra EV transit buses Eaton 500-kW fast charger EV Delivery Trucks . 459 Smith Newton EVs . Distributed around U.S. - Frito-Lay, Staples, FedEx, Coca Cola, AT&T, PG&E - 1-Hz data from over 5 million miles of commercial EV driving - Detailed Frito-Lay field study
Liming · Coastdown coefficient analysis of heavy-duty vehicles and application to the examination of the effects of grade and other parameters on fuel consumption. SAE Technical Paper No. Liming51. Barlow, T. J., Latham, S., McCrae, I. S. and Boulter, P. G. (2009). A reference book of driving cycles for use in the measurement of road vehicle emissions.
Heavy-duty trucks are heavier than medium duty trucks. Their weight ranges between 26001 lbs to over 33000 lbs (11794 kg to over 14969 kg). Heavy-duty trucks comprise a trailer or a goods carrying space and provide easy and safe transportation. Heavy-duty trucks are employed in diverse industries including logistics, construction, and Dump trucks.
Liming · next 5 to 10 years for heavy-duty hybrid vehicle technologies. Hybrid technologies are currently available commercially, or as demonstration projects, for a wide range of heavy-duty vehicle classes, covering vocations ranging from pickups and delivery vans, to parcel and package delivery step-in vans, to transit buses and refuse haulers.
Liming · Because vocational and medium duty trucks tend to have a much lower annual VMT, they burn much less fuel per year.This makes the hurdle for achieving cost -effective fuel saving technologies much higher. Vocational/MD trucks also tend to operate on lower speed, more transient drive cycles. This reduces the potential benefits of both Cd and Crr
Liming · defined drive cycle. Emissions are reported in units of g/km. The pre-defined drive cycle for light-duty vehicles is known as the New European Driving Cycle (NEDC), and it is composed of two sections. The first section, the ECE 15 cycle, was intended to represent urban driving and has been supplemented by the second section,
Liming · The heavy-duty diesel engine, the primary propulsion source for most heavy-duty vehicle freight movement, is subject to many design constraints, including durability, efficiency, and low emissions. There is a need for increased engine efficiency and reliability by heavy-duty vehicle fleet operators and freight shippers.
Liming · Electrification potential analyses are carried out by altering the following specifications as shown in Table 2 (current technology scenario in bold): a. Battery capacity: 150–250−350 kWh for medium (<12t GVW) and heavy (>12t GVW) duty rigid trucks, 400–600−800 kW h for semitrailer and articulated trucks. b. Gravimetric density of the batteries: 120–240−360 W h/kg, …
Liming · In heavy-duty trucks, PEMS equipment is often mounted in the trailer (if present), while in the case of buses and LDVs the main unit is installed in the cabin of the vehicle to avoid contamination, excessive vibrations and overheating of the equipment . The connections of the PEMS to the vehicle are typically reversible, and no further