Motor Vehicle Evaporative Emissions Test Procedures

1
Motor Vehicle Evaporative Emissions Test
Procedures

• Proposed Technical Amendments
• June 22, 2006

2
What Are Evaporative Emissions?

• Hydrocarbon vapors that escape from vehicles
  fuel system
• Four types
• Running loss
• Hot Soak
• Diurnal
• Refueling

3
Evap Control System
Evap Control System

FUEL TANK
GAS CAP
FILL PIPE
CARBON CANISTER
VAPOR PURGE LINE
4
Current Evap Regulations

• Evap Tests
• 3-Day Diurnal High-Temp Hot Soak, Running Loss
• Supplemental 2-Day Diurnal Hot Soak
• ORVR
• Adopted 1995
• LEV II Evap
• Adopted 1998
• Optional Zero Emission Standard PZEV
• In-Use Verification Program

5
Evap Streamlining

• Started 1996
• Collaborative effort
• Reduce testing burden
• No change in stringency
• Guidance letter sent Dec 2002
• U.S. EPAs Final Rule issued Dec 2005

6
Proposed TestProcedure Amendments

• Evaporative Test Procedures
• On-Board Refueling Vapor Recovery
• Other minor amendments

7
Evap Test Procedures

• Optional waiver of 2-Day test
• Can be demonstrated by results from 3-Day and
  ORVR tests
• Other evap tests provide compliance assurances
• Reduces costs and testing time
• Clarify alternative Running Loss test provisions
• Allows ARB to use manufs alternative procedure
• Allow optional canister precondition method

8
ORVR Test Procedures

• Makes hose disconnection optional
• No Compromise in Stringency

9
AdditionalProposed Amendments

• Address four-wheel drive dynamometer provisions
• Update vehicle labeling requirements
• Clarify In-Use Verification Program evap test
  requirements

10
Staffs Recommendation

• Adopt proposed amendments
• Thank You