Intensive development of the turbo-charged and intercooled medium speed diesel engine over the past 10 years has resulted in a progressive increase in both specific output and power available from a single unit. Engines of modern design are now available commercially in the so called medium speed range up to 750 r.p.m. with specific outputs of 0.23 bhp/in3 (0.014 bhp/cm3) of cylinder volume corresponding to a brake mean effective pressure (b.m.e.p.) of 255 lbs/in2 (17.9 kg/cm2). Installations have become technically more complex in proportion to capital invested. Consistent with this control systems have become more sophisticated in order to achieve centralisation, remote monitoring and control of essential services to obtain a reduction, or improvement in environmental conditions, for operating personnel. A typical example of the above philosophy being a multi engined remote operated, unattended marine propulsion system. Although economic considerations coupled with the desire to improve the environment for personnel have motivated the trend for sophisticated automatic controls, a further incentive to their use has become apparent, due to the transient response characteristics of the highly rated engine. This has led to the use of programmed sequential controls, incorporating time delays, as opposed to simple servo-assisted remote controls. This paper describes certain functions of automatic controls, in association with, and their relative importance to, the highly rated medium speed engine and deals not only with the design criteria but with certain technical problems that exist, and methods that have been successfully employed to overcome them. Within the context of this paper automatic controls are defined as either controls pre-programmed to operate in a positive sequence, or controls performing a function in accordance with a chance in another function. This paper is concerned with medium speed engines operating on a four stroke cycle either at constant speed or over a speed range up to maximum values of 750 r.p.m. and brake mean effective pressures in excess of 200 lbs/in2 (14 kg/cm2) embracing powers up to 4800 b.h.p. The engines employ pulse turbo-charging without external aids such as an auxiliary air supply and are currently available, and in service, as marine propulsion, marine auxiliary and industrial generating sets. The main requirement of the engines and ancillary equipment is that they should be reliable and have a useful life of at least 20 years at high load factors for 6000 to 7000 hours per year.


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    Titel :

    Automatic control and associated problems with high pressure charged engines


    Weitere Titelangaben:

    Automatische Regelung von hochaufgeladenen Dieselmotoren


    Beteiligte:
    Gillespie, D.A. (Autor:in) / Smith, R.N. (Autor:in) / Taylor, P.J. (Autor:in)


    Erscheinungsdatum :

    1968


    Format / Umfang :

    35 Seiten, 24 Bilder, 3 Tabellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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