UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2565 PLYMOUTH ROAD

ANN ARBOR, MICHIGAN 48105-2498

OFFICE OF

AIR AND RADIATION

                                                                        
          	     

MEMORANDUM

SUBJECT:	Heavy-Duty Hybrid Onboard Diagnostics

FROM:		Amy Kopin

TO:		The Docket

DATE:		July 19, 2011

	

	On June 14th, 2011 we held a conference call with Allison to discuss
concerns raised by Allison regarding heavy-duty onboard diagnostic (OBD)
requirements and timing. Specifically, they have requested a delay of
the application of HD OBD requirements for hybrid applications until
2020.  Concerns were raised during the comment period for the heavy-duty
greenhouse gas notice of proposed rulemaking that heavy-duty hybrid
applications may not be able to meet the 2013 heavy-duty OBD regulations
that were published in the 2009 OBD Final Rulemaking.,  Attendees from
the EPA and Allison are shown in the table below.  

 U.S. EPA, NHTSA, and DOT, “Greenhouse Gas Emission Standards and Fuel
Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles,”
republished December 29, 2010.  Available here: 
http://origin.www.gpo.gov/fdsys/pkg/FR-2010-12-29/html/2010-32726.htm

 U.S. EPA, “Control of Air Pollution from New Motor Vehicles and New
Motor Vehicles Engines; Final Rule Regulations Requiring Onboard
Diagnostic Systems on 2010 and Later Heavy-Duty Engines Used in Highway
Applications Over 14,000 Pounds; Revisions to Onboard Diagnostic
Requirements for Diesel Highway Heavy-Duty Vehicles Under 14,000
Pounds,” published February 24, 2009.  Available here:
http://www.epa.gov/otaq/regs/im/obd/regtech/hd-obd-frm-02-24-09-notice-7
4-fr-8310.pdf

