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Flow Control of a Solenoid Gas Injector and Its Application on a Natural Gas Engine
심한섭 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
An air-fuel ratio control is essential in reducing hazardous exhaust emissions from a compressed natural gas(CNG) engine, and can be accomplished by accurate control of gas injection flow. In this study, theoretical research was conducted on injection characteristics of a solenoid gas injector, and injection experiments for calibration and analysis were performed. Various factors for gas injection flow such as injection pressure, gas temperature, and supply voltage are studied. A dynamic flow equation of the CNG was proposed on the basis of flow dynamics theories and results of the injection experiment. The verification of the dynamic flow equation of the solenoid injector was carried out with a large CNG engine applied to an urban bus. Air-fuel ratio control experiments were conducted in both steady and transient state. Results of injection experiments for the solenoid injector and the CNG engine was proved the control method proposed herein to be effective.
심한섭 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
Solenoid injectors are able to inject precisely and rapidly fluid during short time. Speed of an armature-needle in the solenoid injector is affected by magnetic motive force, mass of the armature-needle, and return spring. In this paper, injection control characteristics of the solenoid injector are studied such as electro-magnetic characteristics, dynamics of the armature-needle-spring, and fluid dynamics in injection nozzle. Static and dynamic injection mass for on-time variation of the solenoid injector open signal are measured on a bench test. The experimental results show that fuel injection rate can be controlled precisely and the same results as theoretical analyses.