I/M Effectiveness with Today's Closed Loop Systems Powertrain Control Center, Current Product Engineering, General Motors Corporation

Format:

Conference/Event

Author/Creator:

Haskew, Harold M., author.

Conference Name:

Government/Industry Meeting & Exposition (1987-05-18 : Washington, District of Columbia, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1987

Summary:

Analysis of today's closed loop systems shows in-use emission levels - measured using the Federal Test Procedure - greatly reduced from those of vehicles produced in the mid 70s. The tailpipe concentration measurements (idle tests) used in I/M programs do not correlate well with in-use emissions from today's vehicles.I/M tests are not very effective in identifying emission failures and are costly compared to other control strategies. Additionally, I/M programs which do not include adequate vehicle preconditioning increase the number of false failures and cause unnecessary expense. A majority of today's closed loop vehicles have on-board diagnostic systems to identify failures. Interrogating these on-board diagnostic systems, together with parameter inspections, offers a more effective alternative to current I/M programs

Notes:

Vendor supplied data

Publisher Number:

871103

Access Restriction:

Restricted for use by site license