This content is not included in your SAE MOBILUS subscription, or you are not logged in.
4th Generation Diesel Piezo Injector (Realizing Enhanced High Response Injector)
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
Diesel common rail injectors are required to utilize a higher injection pressure and to achieve higher injection accuracy in order to meet increasingly severe emissions, less fuel consumption, and higher engine performance demand. In addition to those requirements, in conjunction with optimized nozzle geometry, a more rectangular injection rate and stable multiple injections with shorter intervals are required for further emissions and engine performance improvement by optimizing the combustion efficiency. Following these requirements DENSO has been working on the development of the 4th generation piezo injector (G4P) according to the following concepts.
- 1)Increase the injection pressure capability up to 270MPa aiming for a better spray atomization.
- 2)Develop a new 3-way valve to achieve zero static leakage and minimized switching leakage which is aiming for a higher fuel robustness and higher energy efficiency.
- 3)Develop a new hydraulic circuit combining a 3-way valve operated by a fast piezo actuator and a pressure balanced control plate, which allows for an increase of the IN/OUT orifice flow for a fast nozzle opening/closing speed with maintaining injection stability and controllability, and aiming for a rectangular injection rate and short hydraulic injection intervals.
This paper reports the G4P injector concepts, structure and hydraulic performance with rectangular injection rate and shorter multiple injection intervals close to zero, and also reports engine performance improvement result with G4P.
CitationUeda, D., Tanada, H., Utsunomiya, A., Kawamura, J. et al., "4th Generation Diesel Piezo Injector (Realizing Enhanced High Response Injector)," SAE Technical Paper 2016-01-0846, 2016, https://doi.org/10.4271/2016-01-0846.
- Matsumoto , S. , Klose , C. , Schneider , J. , Nakane , N. et al. 4th Generation Diesel Common Rail System: Realizing Ideal Structure Function for Diesel Engine SAE Technical Paper 2013-01-1590 2013 10.4271/2013-01-1590
- Weber J , Ruwe J , Sashima N , Hagen J , Ueda D , Sugawara S , Uchiyama K , Ishizuka K Investigation on Advanced Common Rail Injector Improvements IMECHE 2015 U.K.
- Takeuchi K. , Shinohara Y. , Kojima A. , Ishizuka K. , Uchiyama K. , Nakagawa M. , Herrmann O. E. Dr.-Ing. Further Innovations for the Diesel Engine Management and Aftertreatment System 36th International Vienna Motor Symposium 2015
- Shigeyuki Kondo , Yoshio Toyoshima , Tateki Takayama and Masaaki Yamaguchi 200MPa Piezo Common Rail System Journal of Society of Automotive Engineers of Japan Oct 2009 122-09
- Yukihiro Shinohara , Katsuhiko Takeuchi , Olaf Erik Herrmann and Laumen Hermann Josef 3000bar common rail system MTZ worldwide Edition: 2011-01 72 4 8
- Matsumoto , S. , Yamada , K. , and Date , K. Concepts and Evolution of Injector for Common Rail System SAE Technical Paper 2012-01-1753 2012 10.4271/2012-01-1753
- Weber J. , Ruwe J. , Kiyanni J , Sashima N. , Hagen J. , Ueda D. . Sugawara S. , Uchiyama K. , Ishizuka K. , Suzuki M. The Next Generation of Common Rail Injector - Steps to Control Diesel Combustion in Time Symposium for Combustion Controls Aachen 2015
- Hagen J. , Nakagawa M. , Herrmann O.E. , Weber J. , Queck D. , Uchiyama K. , Ishizuka K. , Kawamura J. , Tomida Y. , Mashida M. Diesel Combustion Potentials by further Injector Improvement in case of different engine applications Aachen Colloquium Automobile and Engine Techology Aachen 2015