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Direct Digital Control of Diesel Engines
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English
Abstract
Initially, a new direct digital Diesel fuel injection system: an electronic Pump-Pipe-Valve-Injector system was introduced. A general comparison of this system with other electronic Diesel injection systems indicated that the new system can be more effective for high pressure Diesel injection and more flexible for wide engine speed range. Then, the digital injection control characteristics of this system were studied by both experiment and computer simulation. Some special digital injection control functions were obtained. In particular, it was found that transient effect of the control valve action can be used to regulate the pulsed Diesel fuel flow to achieve a low initial injection rate and high injection cut-off rate. This effect can be optimized by appropriate selection of the control valve location. Finally, a direct digital Diesel engine governing technique was investigated. The theory of discrete systems was applied to model the dynamic transfer characteristics of a Diesel engine equipped with the new injection system. A new digital Diesel idle speed governing system was designed, which adopted a cascade control structure with both the engine speed at the time of injection and the cycle average engine speed for feedback to synchronize governing action with discrete engine operation events. This system was implemented on a computer and tested on a research engine. Satisfactory governing performance was achieved, and a comparison test between the new control strategy and a conventional PID control method showed that the new system resulted in much better control performance.
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Authors
Citation
Yang, M. and Sorenson, S., "Direct Digital Control of Diesel Engines," SAE Technical Paper 940372, 1994, https://doi.org/10.4271/940372.Also In
References
- Yang Minggao Sorenson Spencer C. “Direct Digital Control of Diesel Fuel Injection Process” SAE Transactions 1992 SAE Paper No. 920626
- Yang Minggao Sorenson Spencer C. “Modelling of the Dynamic Processes in an Electronic Diesel Fuel Injection System” SAE Transactions 1992 SAE SP-898 Electronic Controls and Sensors , SAE Paper No. 920240
- Bunting Bruce G. Kimberley John A. “Development of a Square Injection Rate with a Pump-Line-Nozzle System” SAE Paper 851581
- Ichihashi Ichiro Takaishi Tatuso et al “Studies on Fundamental Characteristics----Comprison of Unit Injector and Pump--Line--Nozzle Injection Systems” SAE paper 920629
- Obert Edward F Internal Combustion Engines and Air Pollution Harper International Edition 1973
- Yang Minggao Sorenson Spencer C. “Direct Digital Governing of Diesel Engines” FISITA 94 Congress
- Kuo B. C Digital Control Systems Second 1992 Prentice-Hall International Inc.