P.1 

OAR Box 1147 

Prepped by Ollie Stewart 

Document Number: 

227)IV-E-101 

Docket Number: 

A-87-11 

Printed 4/22/2008 2:42:59 PM Sheet 22 7 of 242 
^ P.2 

A-S'MI 

!'• « ^ UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

\^i^/

 AN N

 ARBOR. MICHIGAN 48105 

OFFICE OF 

AIR ANO RADIATION 

JUN 2 9 1993 » '• 

i i - 7 1993 

MEMORANDUM 

SUBJECT: Meeting with AAMA Regarding Onboard Refueling 

Test Procedures 

%&^CA> flua^c^f FROM: Glenn W. Passavant, Chief 

Special Regulatory Projects Branch 

TO: Public Docket A-87-11 

On June 29, 1993 members of the Environmental Protection 

Agency (EPA) staff met with representatives of the American 

Automobile Manufacturers Association (AAMA) to discuss potential 

changes to the refueling emission test procedures as laid out in 

EPA' s recently published Federal Register notice on this issue (May 

27, 1993, 58 FR 30731) . The meeting was held at the EPA lab in Ann 

Arbor. An attendees list is attached. 

A copy of the material presented by AAMA at the meeting is 

attached. Discussions focused on potential changes in the test 

procedure and how these changes could potentially affect system 

design and in-use control effectiveness. AAMA agreed to provide 

further data on several points and to follow-up with EPA in the 

near future. 

Attachments 
EPA/Industry Meeting 

29 June 1993 

Attendance List 

P.3 

Name Affiliation Telephone Number 

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USCAR LEP - OBD II EVAP 

PROPOSED TESTPORT CONFIGURATION 

MEETING DATE 

APRIL 15, 1993 

DRAFT 

SEALING CAP 

TESTPORT 

ALTERNATE 

LOCATION 

SERVICE 

ACCESSIBLE 

ENGINE 

N/C PURGE 

SOLENOID 

FUEL TANK 

PURGE AIR FILTER 

SERVICE ACCESSIBLE 

TESTPORT TO BE USED FOR: 

- CERTIFICATION 

- COMPLIANCE 

-I/M 240** 

- SERVICE ** 

CARBON 

CANISTER 

N/O CANISTER VENT 

SHUTOFF SOLENOID 

USCAR1 

** SEALING CAP PLACED ON 

CANISTER FRESH AIR PORT 

3/4" O.D. 

W/NON STANDARD 

FINE THREAD 

GREG RICH 

GM NAO 

ENGINEERING 

CENTER 

CDC. WARREN 

u 

-p. 
P.5 

ORVR TEST PROCEDURE PROPOSAL 

EPA SENSITIVITIES: 

• No "gaming/nibbling" 

• Protect EVAP for short trips 

• Saturation canister loading 

• Drain, 10% fill prior to refueling 

• In-use testing burden 

• Resource efficient 

MANUFACTURER DESIRES: 

• Integrated systems (safety, cost, weight) 

• No tailpipe emissions penalty, (beyond Strict EVAP) 

• No canister or system disconnects/connects, especially in-use 

• Resource efficient 

FEATURES OF PROPOSED PROCEDURE: 

• Does not penalize integrated systems 

• Performance based camster loading approximately equivalent to current Strict 

EVAP loading 

• Refueling test drives canister size; therefore, excess capacity available for 

evaporative emissions 

• Provides » 85% refueling fill 

• Does not require canister or system disconnects/connects 

• Facilitates in-use testing: 

- All canister conditioning accomplished via "test port" 

- Does not require unique ambient or fuel temperature control 

- Avoids intrusion into vehicle system 

• Common procedures, except for 20% fill for refueling, through the exhaust 

emissions test. 

• Removes perverse incentive to minimize canister size. 

• Deletes long soak (stabilization) prior to refueling 

• Refueling sequence represents normal condition (after drive) 

American Automobile Manufacturers Association 

6-28-93 

slg/orvrtest.pro 
P.6 

DRAFT PROPOSED 

EVAPORATIVE/REFUELING TESTS 

DRAFT 

* 

i 

CANISTER PRECONDITIONINQ 

PURGE 300 BED VOLUME 

LOAD 5 REAL TIME DIURNALS 

1 . .._ _ 

COLD START EXHAUST TEST 

1

 . .. 

HOT 8TART EXHAUST TEST 

' • • 

HOT SOAK TEST 

68-66 T AMBIENT 

• 

1 

VEHICLE SOAK 

LAST 6 HOURS AT 72 V 

1 

DIURNAL EMISSION TEST 

2 HEAT BUILDS IN 48 HOURS 

72-SOT EXCURSION 

1 

. 

• 

10 MINUTES 

1 

i 

5 MINUTES k 

1HOUR 

, 

6-36 HOURS 

1 

© 

(START) 

" 

FUEL DRAIN 4 R U 

9 RVP, 40% FILL 

7.8 RVP FOR ALTITUDE 

" 

VEHICLE SOAK 

68-86 *F 

PRECONDITIONINQ DRIVE 

ONE UDDS CYCLE 

1 

FUEL DRAIN &F1LL 

40% 

1 

CANISTER PRECONDITIONINQ 

PURGE 300 BED VOLUME 

LOAD 5 REAL TIME DIURNALS 

1 

COLD 8TART EXHAUST TEST 

' ' 

HOT START EXHAUST TEST 

IAX. 

RUNNING LOSS TEST 

95 °F AMBIENT 

UDDS. NYCC, NYCC, UDDS 

.0" MAX. TANK PRESSURE 

' 

HOT 80AK TEST 

95 ±5" F AMBIENT 

1 

VEHICLE SOAK 

LAST 6 HOURS AT 72 «F 

1 

DIURNAL EMISSION TEST 

3 HEAT BUILDS IN 72 HOURS 

72-96 *F EXCURSION 

12 -36 HOURS 

REFUELING TEST 

1 HOUR MAX. 

" 

12 -36 HOURS 

10 MINUTES 

' 

i 

4 HOURS MAX. 

1 

-

1 

5 MINUTES MAX. 

1HOUR 

' 

6-36 HOURS 

1 

FUEL DRAIN &FILL 

20% 

' 

CANISTER PRECONDITIONINQ 

PURQE 300 BED VOLUME 

LOAD 5 REAL TIME DIURNALS 

" 

COLD START EXHAUST TEST 

OR 

COLD DRIVE CYCLE 

" 

HOT START EXHAUST TEST 

OR 

HOT DRIVE CYCLE 

' 

DRIVE CYCLE 

68-86 7 AMBIENT 

UDDS. NYCC. NYCC, UDDS 

' 

REFUEUNQ TEST 

9 RVP (7.8 RVP ALTITUDE) 

7-10QAL/MIN. 

75 T I 

I l HOUR MAX 

© 

" OPTIONAL FOR REFUEUNG, DETERMINED BY NEED FOR EXHAUST EMISSIONS RESULTS 

AMERICAN AUTOMOBILE MANUFACTURERS ASSOCIATION 

6-25-93