Document ID: EPA-HQ-OAR-2014-0827-2102
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2016-10-25T04:00Z

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2000 TRAVERWOOD DRIVE

ANN ARBOR, MI  48105-2498

									     OFFICE OF

									AIR AND RADIATION

11/12/15

MEMORANDUM

SUBJECT: Test Procedure Review with Cummins, Volvo, Navistar, Paccar,
Daimler Eaton and Allison

FROM: James Sanchez

TO:  Greenhouse Gas Emissions Standards and Fuel Efficiency Standards
for Medium- and

Heavy-Duty Engines and Vehicles - Phase 2 - Docket EPA-HQ-OAR-2014-0827

This memo documents communication on November 12, 2015 between
representatives of Cummins, Volvo, Navistar, Paccar, Eaton, Allison,
Daimler and EPA to discuss heavy-duty test procedures proposed in the
Phase 2 greenhouse gas and fuel efficiency standards for heavy-duty
vehicles notice of proposed rulemaking.  The draft presentations are
enclosed.

EPA also presented some preliminary results from testing conducted at
Southwest Research Institute.  The results showed the performance of a
few numerical schemes to interpolate and extrapolate data from the
alternative engine mapping procedure.

Participants: 

Cummins – Jackie Yeager, Manik Narula

Eaton – Erik Dykes

EPA – Houshun Zhang, James Sanchez

Navistar – Cortney Guzlas, Matt Hunkler, Dave Gardner

PACCAR – Dan Kieffer, Erin Luke, Mark Malowicki, Costi Nedelcu, Tom
Sloane

Allison – Mike Howenstein

Volvo – Tony Greszler

Discussion and follow-up items (with owner's name in bold): 

ISB child rating results – Houshun 

See update slides sent separately by Houshun: looking at capability of a
parent rating map to predict child rating and also evaluating various
interpolation or regression schemes

Based on 3 child ratings tested so far (ISB, Volvo, ??), parent fuel map
has good capability to predict child performance on ARB cycle 

Regression Model 1 (only 1-2% error) is leading contender

Check Excel file for which red points have same vehicle configs as green
(map) points – Houshun 

Check if EPA’s results from testing Volvo engine can be shared with
group – James 

Plot ISB results for 55/65 mph cycles – Houshun 

ISB testing represented just one transmission (6 speed auto), but N13
testing will cover 3 transmissions (10 speed auto, 10 speed AMT, 6 speed
auto)

Volvo questions – Tony 

Should we be focusing our evaluation on ARB transient?

Cycle average error on 55/65 mph cycles can be bad outside 9 map points
– some vehicles can’t follow the cycles

If some vehicles are going to be excluded, cycle average map looks
better on 55/65 cycles

Vehicles that are gear-bound will be excluded, but cut point not
selected yet

How can we access GEM revisions that impact engine test cycle? 
-revised shifting, torque lag, ???

GEM release for power users planned in December

Will GEM include cycle average interpolation scheme?  If so, when can
we access GEM with this feature?

Interpolation or regression will be included in GEM release

Can we get a copy of proposed cycle average test procedure, so we are
clear what we should be evaluating?

Draft procedure has been shared

Review draft procedure for discussion/Q&A on next call (11/19) – All 

Other topics?

Question about using fuel mass instead of bsfc in powertrain map. 
Check if PACCAR results can be shared with group – Costi/Mark 

Topics for future calls: 

(11/19) Cycle average map procedure – All 

(12/3) Half-hill cycle results – Erik 

(TBD) ISB child results on 55/65 cycles – Houshun

(Tentative) Volvo testing at EPA – James 

(Tentative) PACCAR results on use of fuel mass vs. bsfc in powertrain
map – Costi/Mark