Raising standards to lower diesel emissions

Science ◽  
2021 ◽  
Vol 371 (6536) ◽  
pp. 1314-1316
Author(s):  
Megan Schwarzman ◽  
Samantha Schildroth ◽  
May Bhetraratana ◽  
Álvaro Alvarado ◽  
John Balmes
Keyword(s):  
Diesel Emissions

Catalytic Oxidation Performance of Wall-Flow versus Flow-Through Monoliths for Diesel Emissions Control

2006 ◽  
Vol 45 (10) ◽  
pp. 3520-3530 ◽  
Author(s):  
Christos K. Dardiotis ◽  
Onoufrios A. Haralampous ◽  
Grigorios C. Koltsakis
Keyword(s):  
Catalytic Oxidation ◽  
Diesel Emissions ◽  
Emissions Control ◽  
Oxidation Performance ◽  
Flow Through ◽  
Wall Flow

Effects of an Oxidation Catalytic Converter on Regulated and Unregulated Diesel Emissions

1994 ◽  
Author(s):  
Gregory M. Pataky ◽  
Kirby J. Baumgard ◽  
Linda D. Gratz ◽  
Susan T. Bagley ◽  
David G. Leddy ◽  
...  
Keyword(s):  
Catalytic Converter ◽  
Diesel Emissions ◽  
Oxidation Catalytic Converter

Diesel Emissions and Health

Science ◽  
1982 ◽  
Vol 216 (4544) ◽  
pp. 360-362
Author(s):  
Herbert S. Rosenkranz
Keyword(s):  
Diesel Emissions

Fuel Effects on Diesel Emissions - A New Understanding

2001 ◽  
Author(s):  
Y Kwon ◽  
N Mann ◽  
D J Rickeard ◽  
R Haugland ◽  
Kjell Arne Ulvund ◽  
...  
Keyword(s):  
Diesel Emissions ◽  
Fuel Effects

Diesel Emission Test Stand for Advanced SCR Control

2015 ◽  
Author(s):  
Joe Noto ◽  
Athul Radhakrishnan ◽  
Ye Sun ◽  
Josh Ferreira ◽  
Marc Compere
Keyword(s):  
Control Systems ◽  
Fuel Economy ◽  
Nox Reduction ◽  
Test Stand ◽  
Diesel Emissions ◽  
Diesel Generator ◽  
Light Duty ◽  
Nox Sensor ◽  
Diesel Emission ◽  
Tier 3

The combination of increasingly challenging emissions regulations and impending Corporate Average Fuel Economy (CAFE) standards of 54.5 mpg by 2025 presents auto makers with a challenge over the next 10 years. The most promising technologies currently available for meeting high fuel economy and low emissions regulations are increased hybridization, turbo downsizing, and increased Diesel engine implementation. Combining these into a hybrid turbo Diesel is an ideal transition technology for the very near future as battery and other alternative fuels become viable for widespread automotive use. This paper presents a Diesel emission test stand to improve Selective Catalytic Reduction (SCR) systems for light duty Diesel vehicles, particularly hybrid power systems that experience many start-stop events. Advanced modeling and control systems for SCR systems will further reduce tailpipe emissions below existing Tier structures and will prepare manufacturers to meet increasingly stringent Tier 3 standards beginning in 2017. SCR reduces oxides of Nitrogen, NO, and NO2, from otherwise untreated Diesel emissions. Scientific study has proved that inhaling this harmful exhaust gas is directly responsible for some forms of lung cancer and a variety of other respiratory diseases. In addition to EPA Tier emissions levels and CAFÉ standards, the On-Board Diagnostics (OBD) regulations require every vehicle’s emission control systems to actively report their status during all engine-on vehicle operation. Testing and development with production NOx sensors and production SCR components is critical to improving NOx reduction and for OEMs to meeting strict Tier 3 light duty emission standards. The test stand was designed for straightforward access to the NOx sensors, injector, pump and all exhaust components. A Diesel Particulate Filter (DPF) followed by a Diesel Oxidizing Catalyst (DOC) precedes the Selective Catalytic Reducer (SCR) injector, mixing pipe and catalyst. An upstream NOx sensor reads engine-out NOx and the downstream NOx sensor reports the post catalyst NOx levels. Custom fabrication work was required to integrate the SCR mechanical components into a simple system with exhaust components easily accessible in a repeatable, controlled laboratory environment. A Diesel generator was used in combination with a custom designed resistive load bank to provide variable NOx emissions according to the EPA drive cycles. A production exhaust temperature sensor was calibrated and integrated into the software test manager. Production automotive NOx sensors and SCR injector, pump and heaters were mounted on a production light duty vehicle exhaust system. The normalized nature of NOx concentration in parts per million (ppm) allows the small Diesel generator to adequately represent larger Diesels for controls development purposes. Both signal level and power electronics were designed and tested to operate the SCR pump, injector, and three Diesel Exhaust Fluid (DEF) heating elements. An Arduino-based Controller Area Network (CAN) communications network read the NOx Diesel emissions messages from the upstream and downstream sensors. The pump, injector, solenoid, and line heaters all functioned properly during DEF fluid injection. CAN and standard serial communications were used for Arduino and Matlab/Simulink based control and data logging software. Initial testing demonstrated partial and full NOx reduction. Overspray saturated the catalyst and demonstrated the production NOx sensor’s cross-sensitivity to ammonia. The ammonia was indistinguishable from NOx during saturation and motivates incorporation of a separate ammonia sensor.

Diesel Emissions Reduction Using a Catalyst and Water Scrubber for Underground Mine Applications

1988 ◽  
Vol 202 (4) ◽  
pp. 233-242
Author(s):  
G E Andrews ◽  
R Everest ◽  
D Jepson ◽  
S W Pang
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Substantial Reduction ◽  
Diesel Emissions ◽  
Emissions Reduction ◽  
Gaseous Emissions ◽  
Engine Exhaust ◽  
Particulate Removal ◽  
Water Scrubber ◽  
Exhaust Particulate

BS 6680 requires the efficiency of coalmine diesel engine exhaust pollution-reduction devices to be determined. The efficiency of an Englehard PTX catalyst and water scubber for both particulate and gaseous emissions reduction was determined using a 533 cc single-cylinder Petter AVI direct injection diesel engine. The separate and combined influence of the two exhaust devices was determined. The water scrubber acted as aflame trap as well as an exhaust particulate trap. The catalyst gave a substantial reduction in CO and UHC gaseous emissions and particulate SOF emissions for exhaust temperatures above 250°C. However, the high MW particulate SOF, including the PAH, had a 70 per cent reduction for catalyst temperatures as low as 200°C. The water scrubber was the dominant particulate removal device, although the catalyst removal efficiency was significant for temperatures above 250° C. The scrubber also had a significant influence on the reduction in NOx emissions, with a 30 per cent removal at high exhaust temperatures.

A Corporate Scandal that Hits Close to Home: Examining Owners’ Responses to the Volkswagen Diesel Emissions Scandal

2017 ◽  
Vol 11 (6) ◽  
pp. 740-755 ◽  
Author(s):  
Ezra M. Markowitz ◽  
Daniel A. Chapman ◽  
Meaghan L. Guckian ◽  
Brian Lickel
Keyword(s):  
Diesel Emissions ◽  
Corporate Scandal
Sign in / Sign up

Export Citation Format

Share Document