Carbon Canister-Based Vapor Management System to Reduce Cold-Start Hydrocarbon Emissions ServoTech Engineering

Format:

Conference/Event

Author/Creator:

Servati, Hamid, author.

Conference Name:

Powertrain & Fluid Systems Conference & Exhibition (2005-10-24 : San Antonio, Texas, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2005

Summary:

Engine out (feedgas) emissions control during cold start operations has been a major technical challenge since mandated LEV/ULEV/SULEV/PZEV regulation compliance. Cold start emissions contribute to more than 85% of total emissions in a FTP test. Unburned Hydrocarbons are mostly generated during cold starts due to a rich Air/fuel ratio strategy. Cold intake and cylinder wall surfaces do not provide a quick vaporization bed for the rich fuel, therefore un-vaporized and unburned fuel result in excessive tailpipe emissions. Utilizing fuel vapor during cold starts reduces the Hydrocarbon (HC) emissions level and minimizes the transient fuel effect process.A vapor management system must function to control the Air-to-fuel ratio of the intake charge during "cold-starts", idle, and drive-away, or until catalyst lights off to a desired level. Additionally, vapor fuelling can provide solutions to the inherent problems of "cold fuel enrichment", "wall wetting", "lost-fuel", and "mixture preparation", as well as, open up beneficial opportunities for lean air-fuel ratio cold starts.A Vapor Management control System consisting of a Carbon Canister vapor source, supplying a traditional induction system augmented with additional subsystems in a preferred configuration, has been designed and tested, and the results presented in this paper. A major reduction in HC emissions over liquid port injection (PFI) is achieved

Notes:

Vendor supplied data

Publisher Number:

2005-01-3866

Access Restriction:

Restricted for use by site license