Realizing Robust Combustion with High Response Diesel Injector with Controlled Diffusive Spray Nozzle and Closed Loop Injection Control

Paper #:
  • 2017-01-0845

Published:
  • 2017-03-28
Abstract:
Diesel engine performance has drastically improved following the introduction of the Common Rail system. Improvements to the Common Rail systems have greatly contributed to providing benefits relating to fuel consumption, emissions output and drivability. However further technical advances in the area of precise combustion control are required to satisfy increasingly stringent worldwide emissions limits and to produce more attractively performing diesel powered vehicles. Common Rail injectors significantly contribute in improving combustion; this improvement can be achieved by precisely controlling injected fuel quantity as well as injectors tolerating and operating at increased injection pressures. In addition to those characteristics; a more rectangular injection rate, the capability of stable multiple injections at shorter intervals and spray form control, are required to achieve an optimized fuel mixture temporally and spatially. Furthermore, various fuel properties must be considered when attempting to maintain optimized injection and combustion conditions. This paper reports the following two innovative injector technologies to realize the requirements mentioned above. 1) A new improved combustion method can be achieved thanks to high responsive 4th generation piezo injector (G4P) and special hole shape CDS (Controlled Diffusive Spray). Benefits include reduced heat loss during combustion, which in-turn increases combustion efficiency. 2) Closed loop injection control can feedback injection rate data which is used to obtain robust combustion. The system works through a pressure sensor built-in to the injector which can detect actual injection rate and some fuel properties. We can realize engine performance and combustion robustness improvements from the proposed technologies with a variety of fuels with different fuel properties.
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