SAE 2014 Heavy-Duty Diesel Emissions Control Symposium
Technical Session Schedule
Thursday, September 18
Alternative Fuel and Powertrains
(Session Code: HDD500)
Room Bankett High 09:00
Moderators - Nitin Patel, Volvo Powertrain Corporation
|| ORAL ONLY
|High Efficient Natural Gas Engine Technologies to Meet the New U.S. Greenhouse Gas Emissions for Commercial Vehicles
The world-wide commercial vehicle industry is faced with numerous challenges to reduce oil consumption and greenhouse gases, meet stringent emissions regulations, provide customer value, and improve safety. This work focuses on the new U.S. regulation of greenhouse gas (GHG) emissions from commercial vehicles and natural gas engines and the most likely technologies to meet future anticipated standards while improving transportation freight efficiency. Over 90% of all U.S. freight tonnage is transported by diesel power and over 75% is transported by trucks. Given the price differential between natural gas and diesel, an increasing number of vehicle fleets and individual owner-operators are transitioning to natural gas.
In the U.S., EPA and NHTSA have issued a joint proposed GHG rule that sets limits for CO2 and other GHGs from pick‐up trucks and vans, vocational vehicles, semi‐tractors, and heavy duty (HD) diesel and natural gas engines. The proposed rule requires pick‐up trucks and vans to comply with vehicle CO2 limits based on chassis dynamometer testing of complete vehicles. For vocational vehicles, the focus is on emission of CO2 from the engine as measured during the transient test (FTP) for criteria pollutants. Under the proposed rule, semi‐tractors would be regulated for both vehicle and engine CO2 emissions. The tractor emissions would be determined by a vehicle model using aerodynamic, rolling resistance, idling, and weight parameters as determined from component testing protocols. Tractor engine CO2 emissions would be measured during the steady‐state test (SET) for criteria pollutants.
This paper will discuss and compare different approaches to GHG regulation for commercial natural gas vehicles based on considerations of cost, complexity, real‐world fidelity, and environmental benefit. In addition, the paper will describe Cummins approach to meeting anticipated GHG standards for vocational engines and semi‐tractor engines with technologies including advanced aftertreatment, turbocompounding, waste heat recovery (Rankine) cycles and hybrid power trains. Innovation in component technology coupled with system integration is enabling Cummins to move forward with the development of high efficiency clean natural gas products with a long term goal of reaching 50% brake thermal efficiency for the engine plus aftertreatment system.
Donald Stanton, Cummins Inc.
|| ORAL ONLY
|CO2 and Energy: Challenges of Future Heavy Duty Propulsion
Staffan H. Lundgren, Volvo Car Corporation