This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Shaping of Fuel Delivery Characteristics for Solenoid Operated Diesel Engine Gaseous Injectors
Annotation ability available
Sector:
Language:
English
Abstract
Solenoid operated gaseous injectors, when compared to conventional liquid fuel diesel injectors, differ in the way the fuel dose and its discharge rate are controlled. While in conventional diesel systems, the fuel dose and its injection rate depends on the fuel injection pump effective stroke and on the plunger diameter and velocity, the solenoid injectors operate in an “on-off” manner which limits the ability to control the gas discharge rate, resulting in its profile to be basically rectangular in shape. To reduce the gas injection rate at the beginning of the injection process in order to suppress the “diesel-knock” phenomenon, similar procedures as used in diesel engines could be implemented. One such approach is to use a throttling type pintle nozzle, and another method is to use a double-spring injector with a hole nozzle. The rationale for using such nozzle configurations is that gaseous fuels do not require atomization, and therefore, can be injected at lower discharge velocities than with liquid fuels.
The gas delivery characteristics from a solenoid injector has been computer-simulated in order to assess the impact of the investigated three modes of fuel discharge rate control strategies. The simulation results confirmed that the gas dose and its discharge rate can be shaped as required. An experimental set-up is described to measure the gas discharge rate using a special gas injection mass flow rate indicator with a strain-gage sensor installed at the entry to a long tube, similar to that proposed by Bosch for liquid fuel volumetric flow rate measurements.
Recommended Content
Authors
Citation
Hong, H., Krepec, T., and Kekedjian, H., "Shaping of Fuel Delivery Characteristics for Solenoid Operated Diesel Engine Gaseous Injectors," SAE Technical Paper 960869, 1996, https://doi.org/10.4271/960869.Also In
References
- Furuhama, S. Kobayashi, Y. “A Liquid Hydrogen Car with a Two-Stroke Direct Injection Engine and LH-Pump” Int. J. Hydrogen Energy 7 11 1982
- Wakenell J.K. O'Neal G.G. Baker Q.A. Urban C.M. “An Investigation of High Pressure/Late Cycle Injection of CNG as a Fuel for Rail Applications” Southwest Research institute 1988
- Miele, D. Krepec, T. Giannacopoulos, T. “Electronic Injection System for Natural gas in a Diesel Engine, Development and Testing” SAE Paper No. 890852 1989
- Green, C.J. Wallace, J.S. “Electronically Actuated Injector for Gaseous Fuels” SAE Paper No. 892147
- Krepec, T. Carrese, G. Miele, D. “Further Investigations of Electronically Controlled Hydrogen Storage and Direct Injection System for Automotive Applications” Int. J. Hydrogen Energy 17 12 1992
- Hong, H. Krepec, T. Cheng, R.M.H. “Computer Aided Design Optimization of Fast Operating Electronically Controlled Fuel Injectors” 2 nd International Conference on Road Vehicle Automation ROVA '95 INTERNATIONAL Bolton Institute Bolton, England September 11-13 1995
- Hong, H. Krepec, T. Cheng, R.M.H. “Transient Response of Fast Acting Solenoids in Automotive Applications” Journal of Circuits, Systems, and Computers World Scientific Publishing Co. 4 4 1994
- Bosch, W. “Der Einspritzgesetz-Indikator, Ein neues Messgerät zur directen Bestimmung des Einspritzgesetzes von Einzeleinspritzungen” M.T.Z. 7 1965
- Kekedjian, H. “Further Development in Solenoid Operated Injectors for High Pressure Direct Fuel Injection” Department of Mechanical Engineering, Concordia University Montreal, Quebec May 1994
- Fox, R.W. McDonald, A.T. Introduction to Fluid Mechanics 3rd John Wiley & Sons U.S.A. 1985 569 570