1 / 17

Workshop on Phase 3 Reformulated Gasoline and the Predictive Model

Workshop on Phase 3 Reformulated Gasoline and the Predictive Model . September 28, 1999 Sacramento, CA. Agenda. Goals Test Program - Update EMFAC99 -vs- EMFAC7g - Progress Report Off-Cycle Off-Road CO Credit In-Use Fuel Properties for 1998 Draft Specifications CaRBOB

howie
Download Presentation

Workshop on Phase 3 Reformulated Gasoline and the Predictive Model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Workshop on Phase 3 Reformulated Gasoline and the Predictive Model September 28, 1999 Sacramento, CA

  2. Agenda • Goals • Test Program - Update • EMFAC99 -vs- EMFAC7g - Progress Report • Off-Cycle • Off-Road • CO Credit • In-Use Fuel Properties for 1998 • Draft Specifications • CaRBOB • Other Presentations? • Autos • Oils • Oxygenate • Others • Next Meeting

  3. Goals • Provide Flexibility, for removing MTBE while preserving real-world benefits • Obtain additional reductions that are technically and economically reasonable

  4. Advanced Technology Vehicles Test Program • 5 Fuels • Sulfur Levels - 5, 30 , 100 • Oxygen Levels - 0%, 2%, 3.5% • Update Technology Group 5 Coefficients • Update on Progress

  5. Off-Cycle Adjustments • Only one study compared two oxygen levels (2%, 3.5%) on FTP and Rep05 - ARB Ethanol Test Program. • Increase CO reduction • Increase NOx increase

  6. Off-Road • 4-Stroke and 2-Stroke • Tend to Run Rich • Oxygen tends to lean-out process • Oxygen increases NOx • No Catalytic Converter • Implies NOx increase difficult to offset. • No sulfur effect • Uncontrolled for Evaporative Emissions • Increased Emissions • Emissions tend to have higher reactivities • Increased toxics (benzene) emissions

  7. Off-Road • Very thin on data on 2% to 3.5% oxygen • 4 4-stroke engines • 4 2-stroke engines • Highly variable exhaust responses • NOx: 2.9 to 39.2 % • CO: -1.3 to -32.1 % • HC: 0.7 to -14.5 % • EPA Off-road Diurnal Evaporative Emissions Model

  8. Off-Road • No apparent benefit from off-road evaluation • Diurnal emission increase larger than on-road • Reactivity from SHED diurnal evaporative emissions test - 2.8 • Diurnal emissions reactivity larger than on-road • Apparent NOx increase • Work in progress.

  9. Carbon Monoxide Credit • 3 Technology Groups • 5 Studies - Auto/Oil 1, 4, 6, 17, and ARB Ethanol Study • Only ARB Ethanol Study Directly Compared Fuels • Off-cycle Emissions • 5 Studies - ARB Ethanol, Auto/Oil, ATL Low Oxygen, and Colorado Study (???) • U.S. EPA Draft Report - Fuel Oxygen Effects on Exhaust CO Emissions - MOBILE6 • Approximately 0.2 RVP Credit for increasing oxygen from 2% to 3.5%

  10. Adjustments to CO Debit for Less than 2% Oxygen • US EPA - Fuel Sulfur Effects on Exhaust Emissions. • Unocal - Regression Equations (Phase 2 Staff Report).

  11. In-Use Fuels

  12. Goals • Provide Flexibility, for removing MTBE while preserving real-world benefits • Obtain additional reductions that are technically and economically reasonable

  13. Draft Specifications

  14. Draft Specifications * - No Change, NA - Not Applicable

  15. CaRBOB • Tom Jennings, ARB Legal • Others

  16. Presentations by Others? • Autos • Oils • Oxygenates • Others

  17. Next Business • Other business • Next Meeting • Posting Next Beta Model on Website

More Related