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Venturi Vacuum Transducer Enables Heavy EGR Control
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English
Abstract
In order to significantly reduce NOx levels by EGR (Exhaust Gas Recirculation), while maintaining good fuel economy and driveability, the EGR flow rate must be properly and accurately controlled under a variety of engine operating conditions.
Toward this objective, a new EGR control system was developed. It utilizes a carburetor venturi vacuum for a stable reference signal that represents the engine operating condition and it controls the EGR flow rate by using a feedback principle to obtain sufficient flexibility compatible with several different engines. Its control characteristics were mathematically analyzed. And it has also been confirmed that the system can automatically compensate for the drift in EGR characteristics. This EGR control system has been utilized in Nissan’s emission control systems in order to comply with the 1978 Japanese Emission Standards and the 1980 U.S. Federal and California Emission Standards.
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Topic
Citation
Aoyama, S. and Hayashi, Y., "Venturi Vacuum Transducer Enables Heavy EGR Control," SAE Technical Paper 800824, 1980, https://doi.org/10.4271/800824.Also In
References
- Ohigashi S. Kuroda H. Nakajima Y. Hayashi Y. Sugihara K. “Heat Capacity Changes Predict Nitrogen Oxides Reduction by Exhaust Gas Recirculation” SAE Paper 710010
- Kuroda H. Nakajima Y. Sugihara S. Takagi Y. Muranaka S. “The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy” SAE Paper 78006.