Development of Next-Generation Air-Fuel Ratio Control System, “COSMIC” 2002-01-0477
For compliance with the exhaust emission regulations, such as SULEV and STAGE4, a new air-fuel ratio control system has been developed. The concept behind this system is that the best performance of air-fuel ratio control is achieved with the minimum of man-hours of adaptation. The system consists of a section in which an engine's air-fuel ratio is fed back and a section in which the amount of oxygen stored by the catalyst is predicted and controlled. In the feedback section, a high-precision air-fuel ratio control was achieved. In the oxygen storage mass predicting and controlling section, a catalyst model was incorporated to predict the amount of oxygen in the catalyst. The important point to note in this control system is that the air-fuel ratio feedback section requires no adaptation work when using an actual engine. Furthermore, a linearized oxygen sensor capable of detecting air-fuel ratios has been also developed at a reasonable cost to exploit the high controllability and good robustness of the control system. In consequence, a sophisticated but low-cost air-fuel ratio control system was successfully developed.
Citation: Hosoya, H., Yoshizawa, H., Ohkuma, S., Watanabe, S. et al., "Development of Next-Generation Air-Fuel Ratio Control System, “COSMIC”," SAE Technical Paper 2002-01-0477, 2002, https://doi.org/10.4271/2002-01-0477. Download Citation
Also in:
Electronic Engine Control Technologies-PT-73, Electronic Engine Control Technologies, 2nd Edition-PT-110, Electronic Engine Controls 2002: Electronics and Information Gathering-SP-1690