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CATALYST SYSTEMS DEVELOPMENT
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English
Abstract
This paper describes the results of studies on the behavior of air-fuel ratios under feedback control, the effect of air-fuel ratio modulation on three-way catalyst conversion efficiency and emission test results with and without feed back control. As a further measure for decreasing automobile exhaust emissions, the three-way catalyst activity for reduction of CO, HC and NOx emissions is most effectively utilized when the normal engine air-fuel ratio perturbations are controlled and limited. In order to attain such an objective, this report describes the governing characteristics of an air-fuel ratio control system using an EFl engine coupled to a ZrO2 type O2 sensor and feed back loop. The conversion efficiency characteristics of a conventional three-way catalyst, using systematically modulated air-fuel ratios, and the resultant reduction of exhaust emissions with these systematic fluctuations and limited perturbations are also defined.
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Citation
Kaneko, Y., Kobayashi, H., Komagome, R., Nakagami, T. et al., "CATALYST SYSTEMS DEVELOPMENT," SAE Technical Paper 770197, 1977, https://doi.org/10.4271/770197.Also In
References
- Gandhi H. S., Piken A. G., Shelef M. and Delosh R. G., “Laboratory Evaluation of Three-Way Catalysts”, SAE Paper No. 760201, 1976.
- Rivard J. G., “Closed-Loop Electronic Fuel Injection Control of the Internal-Combustion Engine”, SAE Paper No. 73005, 1973.
- Gorille I., Rittmannsberger N. and Werner P., “Bosch Electronic Fuel Injection with Closed Loop Control”, SAE Paper No. 750368, 1975.