Closed-Loop Air-Fuel Ratio Control Using Forced Air-Fuel Ratio Modulation

Paper #:
  • 980041

Published:
  • 1998-02-23
Citation:
Reed, D., Hamburg, D., and Samimy, B., "Closed-Loop Air-Fuel Ratio Control Using Forced Air-Fuel Ratio Modulation," SAE Technical Paper 980041, 1998, https://doi.org/10.4271/980041.
Pages:
8
Abstract:
An air-to-fuel ratio (A/F) modulation scheme is presented in which a linear feedback signal is generated from a heated exhaust gas oxygen (EGO) sensor. In this scheme, the engine A/F is modulated with a triangular waveform, and the mean value of the EGO output is obtained using a rolling average filter. The resulting output is linearly related to the exhaust A/F, and is used to provide closed-loop lean A/F operation following a cold start to enhance catalyst light-off and minimize vehicle exhaust emissions. Some engine-dynamometer results obtained using the method are presented.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2018-02-20
Technical Paper / Journal Article
2010-10-25