Application of Air Fuel Ratio Control to a Motorcycle with Dual Oxygen Sensor Kawasaki Heavy Industries, Limited

Format:

Book

Conference/Event

Author/Creator:

Abe, Takashi, author.

Contributor:

Kuratani, Shinichi

Mori, Yoshinobu

Yanase, Daisuke

Conference Name:

Small Engine Technology Conference & Exposition (2011-11-08 : Sapporo, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Tokyo, JAPAN Society of Automotive Engineers of Japan 2011

Summary:

At the upstream part of the Three-Way Catalyst (TWC) an O₂ sensor (UpO₂S) is used for O₂ Feedback Control (O₂F/B) that controls the air-fuel ratio (A/F) close to the stoichiometric level. O₂ sensor has a bit of individual characteristic difference as for the switching the excess air ratios of output (λ shift). This phenomenon becomes remarkable according to the effects of unburnt elements in exhaust gas. Despite the O₂F/B implementation, A/F isn't controlled to the stoichiometric level and the conversion efficiency of the TWC could be lower. Maintaining a higher level of TWC conversion efficiency requires more accurate A/F control and corrections of the UpO₂S λ shift issue. Therefore, using an O₂ sensor at the downstream part of the TWC (DownO₂S)~where the effects of unburnt elements in exhaust gas are smaller~can be an effective way to restore these challenges. We measured the relation between DownO₂S behavior and the TWC conversion efficiency on motorcycles and found out a strong correlation between them. With this correlation in mind, we were able to improve the TWC conversion efficiency by employing an A/F control system with Dual Oxygen Sensor (UpO₂S and DownO₂S)

Notes:

Vendor supplied data

Publisher Number:

2011-32-0629

Access Restriction:

Restricted for use by site license