Measurement of Oxygen Storage Capacity of Three-Way Catalyst and Optimization of A/F Perturbation Control to Its Characteristics Mazda Motor Corporation

Format:

Conference/Event

Author/Creator:

Miyamoto, Kouji, author.

Conference Name:

SAE 2002 World Congress & Exhibition (2002-03-04 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2002

Summary:

In order to study alternate methods of Air Fuel ratio (A/F) perturbation for maximizing three-way catalyst conversion efficiency, two methods for measuring the Oxygen Storage Capacity (OSC) of Catalyst were developed on an engine test bench. The first is to measure just the break-through Perturbing Oxygen Quantity (POQ, which is defined as the product of A/F amplitude, perturbation period and gas flow), and the second is to measure the response delay of the rear A/F sensor, which has been improved to be very similar to the former.Then, the OSC values of many catalysts were investigated with different perturbation parameters. The results show that OSC would not be affected by amplitude, period of perturbation and gas flow, and that the best conversion efficiency is obtained when the value of POQ is about 1/2 of the value for OSC.These results suggest that the best way to control perturbation is to keep POQ at 1/2 of OSC by setting perturbation parameters. Then optimized perturbation control algorithm has been developed and satisfactory conversion efficiency is realized. Furthermore, the perturbation control is appeared to make the catalyst monitor system more confident

Notes:

Vendor supplied data

Publisher Number:

2002-01-1094

Access Restriction:

Restricted for use by site license