This paper focuses on the preliminary design of aproportional solenoid aimed at controlling the lowpressure stage of a two stage pressure regulator forCNG applications.In particular, the dynamic performance of a two stagepressure regulator is firstly studied in the wholeoperational field of a four stroke, four cylinder sparkignition engine, equipped with a simplified lowpressureCommon Rail type collector serving fourPWM actuated single stage injectors.Then, with the aim of developing an electro-magneticdirect actuation, the dynamic performance of thesecond stage needle is adopted to drive the design ofa spires type, cylindrical coil proportional solenoid. Inparticular, both the steady and the transients stepsneeded to complete the preliminary design arehighlighted, and the influence of some relevant designparameters (such as the coil geometry and the air gap)on the actuation characteristics are evidenced.Finally, the proportional solenoid is introduced into astandard electro-magnetic control circuit, and itsdriving capabilities, its dynamic performance and itslimit of applications are determined for different actualoperating conditions of the second stage needle.
This paper focuses on the preliminary design of a proportional solenoid aimed at controlling the low pressure stage of a two stage pressure regulator for CNG applications. In particular, the dynamic performance of a two stage pressure regulator is firstly studied in the whole operational field of a four stroke, four cylinder spark ignition engine, equipped with a simplified low-pressure Common Rail type collector serving four PWM actuated single stage injectors. Then, with the aim of developing an electro-magnetic direct actuation, the dynamic performance of the second stage needle is adopted to drive the design of a spires type, cylindrical coil proportional solenoid. In particular, both the steady and the transients steps needed to complete the preliminary design are highlighted, and the influence of some relevant design parameters (such as the coil geometry and the air gap) on the actuation characteristics are evidenced. Finally, the proportional solenoid is introduced into a standard electro-magnetic control circuit, and its driving capabilities, its dynamic performance and its limit of applications are determined for different actual operating conditions of the second stage needle.
The Preliminary Design of a Direct Actuation for CNG Pressure Regulator Low-Pressure Stage Control / Franzoni, F.; Milani, M.; Montorsi, L.; Borghi, M.. - In: SAE TECHNICAL PAPER. - ISSN 0148-7191. - STAMPA. - 15:(2007), pp. 1-12. (Intervento presentato al convegno 8th International Conference on Engines for Automobile, ICE 2007 tenutosi a Capri, Naples Italy nel 16 - 20 September 2007) [10.4271/2007-24-0069].
The Preliminary Design of a Direct Actuation for CNG Pressure Regulator Low-Pressure Stage Control
Franzoni F.;Milani M.;Montorsi L.;Borghi M.
2007
Abstract
This paper focuses on the preliminary design of a proportional solenoid aimed at controlling the low pressure stage of a two stage pressure regulator for CNG applications. In particular, the dynamic performance of a two stage pressure regulator is firstly studied in the whole operational field of a four stroke, four cylinder spark ignition engine, equipped with a simplified low-pressure Common Rail type collector serving four PWM actuated single stage injectors. Then, with the aim of developing an electro-magnetic direct actuation, the dynamic performance of the second stage needle is adopted to drive the design of a spires type, cylindrical coil proportional solenoid. In particular, both the steady and the transients steps needed to complete the preliminary design are highlighted, and the influence of some relevant design parameters (such as the coil geometry and the air gap) on the actuation characteristics are evidenced. Finally, the proportional solenoid is introduced into a standard electro-magnetic control circuit, and its driving capabilities, its dynamic performance and its limit of applications are determined for different actual operating conditions of the second stage needle.
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