Studies on Fundamental Characteristics - Comparison of Unit Injector and Pump-Line-Nozzle Injection Systems

Paper #:
  • 920629

Published:
  • 1992-02-01
Citation:
Ichihashi, I., Takaishi, T., Tosa, Y., and Nagae, Y., "Studies on Fundamental Characteristics - Comparison of Unit Injector and Pump-Line-Nozzle Injection Systems," SAE Technical Paper 920629, 1992, https://doi.org/10.4271/920629.
Pages:
15
Abstract:
We have investigated the fundamental characteristics of unit injectors and pump-line-nozzle systems theoretically by a graphical analysis of characteristic lines. We have confirmed the higher potential of unit injectors for higher injection pressure, compared with pump-line-nozzle systems. It can be said that the unit injector has the ability to reach higher injection pressures with smaller drive system and less power loss than that of pump-line-nozzle systems.Furthermore, we have obtained basic views on how to improve the defective delivery characteristics in the low-speed region by a simulation method and with experiments. We have confirmed that modulus of rigidty in the driving system influences not only injection pressure but also injection mode.
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