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Super Ultra Low Emission System for the Accord SULEV

Article of Honda R&D Technical Review Vol.12 No.2

Summary

We developed the Accord SULEV (Super Ultra Low Emissions Vehicle) in order to comply with California’s LEV-II SULEV regulations. The emissions system employed is characterized by applying only an under-floor catalyst to attain the super ultra low emissions levels through sophisticated control technology. The improved three-way catalyst achieves both high conversion efficiency and low back pressure while using the same amount of precious metal as was used in the Accord ULEV. (1)
To satisfy SULEV standards using only the under floor catalyst, we developed technologies to increase emissions temperatures by controlling the amount of intake air and the ignition timing before the catalyst is active. This promoted quick catalyst light-off and enabled us to obtain leaner air/fuel ratios when the engine is started than was possible with the previous catalyst system.
Also, in order to further improve the conversion performance of the catalyst once it is active, we developed a New Secondary O2 Feedback Control System. This is an extremely high precision system that identifies the dynamic changes of the catalyst in real time and utilizes a sliding mode controller mechanism to predict changes in the post-catalyst sensor output.
The implementation of these technologies makes it possible to achieve the most rigorous SULEV standards, with engine output performance equivalent to our ULEV vehicle.

Reference

(1) Kishi, N., Kikuchi, S., Seki, Y., Kato, A., and Fujimori, K.: Development of High Performance L4 Engine ULEV System, SAE Paper 980415
(2) Shimasaki, Y., et al.: Study on Conformity Technology with ULEV Using EHC System, SAE Paper 960342
(3) Ueno, M., Akazaki, S., Yasui, Y. and Iwaki, Y.: A Quick Warm-up System during Engine Start-up Period Using Adaptive Control of Intake Air and Ignition Timing, Honda R&D Technical Review, Vol.11, No.1, p.73-78 (1999)
(4) Maki, H., Hasegawa, Y., Akazaki, S., Komoriya, I., Nishimura, Y. and Hirota, T.: Real Time Control Using STR in Feedback System, SAE Paper 950007
(5) Fujii, S.: Digital Adaptive Control, Computrol, No 27, p28-, Corona, July 1989
(6) Suzuki, T.: Basic of Adaptive Control, Computrol, No.32, p7-, Corona, July 1990
(7) Yasui, Y., Akazaki, S., Ueno, M., and Iwaki, Y.: Adaptive Sliding Mode Control for Secondary O2 Feedback, Honda R&D Technical Review, Vol.11, No.1, p.65-71 (1999)
(8) Yasui, Y., Akazaki, S., Ueno, M., and Iwaki, Y.: Adaptive Sliding Mode Control for Secondary O2 Feedback, A Second Report, Honda R&D Technical Review, Vol.11, No.2, p.65-71 (1999)
(9) Nonami, K., Den, H.: Sliding Mode Control, Tokyo, Coronasha, 1994, p263

Author (organization or company)

Hiroshi KITAGAWA(Tochigi R&D Center)、Toshihiro MIBE(Tochigi R&D Center)、Kazunori OKAMATSU(Tochigi R&D Center)、Yuji YASUI(Tochigi R&D Center)

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