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Development of Closed Loop Secondary Air Control Three-Way Catalyst System
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English
Abstract
The three-way catalyst system using a carburetor still needs a lot of improvement for meeting emission standards of U.S. for 1981, California for 1983, and Japanese for 1978. In order to improve air fuel ratio control capability of a carburetor three-way catalyst system, Toyota has developed a closed loop secondary air control system. In this system air fuel ratio is controlled not in the induction but in the exhaust. The short control loop of this system provides high air-fuel ratio oscillation frequency and rapid correction ability for maintaining the exhaust air-fuel ratio at stoichiometric. This gives the system a higher conversion efficiency. This paper describes the performance characteristics and an analysis of the system with regards to emission, driveability and fuel economy.
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Authors
- T. Toyoda - Engine Research & Emission Control Dept., Higashifuji Technical Center, Toyota Motor Co., Ltd
- Y. Yamakawa - Engine Research & Emission Control Dept., Higashifuji Technical Center, Toyota Motor Co., Ltd
- T. Inoue - Engine Research & Emission Control Dept., Higashifuji Technical Center, Toyota Motor Co., Ltd
- K. Oishi - Engine Research & Emission Control Dept., Higashifuji Technical Center, Toyota Motor Co., Ltd
- K. Hattori - Engine Research & Emission Control Dept., Higashifuji Technical Center, Toyota Motor Co., Ltd
Topic
Citation
Toyoda, T., Yamakawa, Y., Inoue, T., Oishi, K. et al., "Development of Closed Loop Secondary Air Control Three-Way Catalyst System," SAE Technical Paper 800399, 1980, https://doi.org/10.4271/800399.Also In
References
- KIMBARA Y. “Toyota Emission Control Systems for 1978 Japanese Emission Standards.” 1978 JSAE Review
- Seiter, R. E. Clark, R. J. “Ford Three-Way Catalyst and Feedback Fuel Control System.” SAE Paper 780203 presented at the SAE Congress February 1978
- Masaki, K. Aono, S. Akaeda M. Minami, H. “Development of the Nissan Electronically Controlled Carburetor System.” SAE Paper 780204 presented at the SAE Congress February 1978
- Canale, R. P. Winegarden, S. R. Carlson C. R. Miles, D. L. “General Motors Phase 2 Catalyst System.” SAE Paper 780205 presented at the SAE Congress February 1978