【作者】

Oleksiy Bondarenko

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。In the field of marine application, natural gas fuelled engine is a promising successor of Diesel engine, owing to lower emissions and fuel cost. However, the marine application imposes vast requirements on transient responses, such as ship manoeuvring requires fast response to the load demand, in rough weather the engine is exposed to large load fluctuation, etc. Moreover, the engine can be coupled to a fixed pitch propeller (FPP), controllable pitch propeller (CPP) or electric generator specifying various modes of operation. In respect that the gas engine combustion process differs from that in Diesel engine, the load acceptance is subject to specific limitation due to a knock and misfiring phenomena. Thus, for the gas engine to be efficient and safe propulsion unit, it is necessary to consider the problems related to transient response behavior and develop countermeasures. The paper employs mean value approach for constructing the engine model where non-linear dynamics are modelled from first principles using available non-linear characteristics of essential components. In order to capture the particularities inherent to the gas engine, notably air throttle valve and fuel gas admission valve, the nonlinear model of components has been developed and discussed in details. The nonlinear model is parametrized from the engine test data and model fitness is then confirmed. Finally, the paper discusses the derivation of a linearized model of the target engine which is necessary for transfer function model describing the transition from the inputs to the desired outputs. The transfer functions constituent parameters can be readily obtained from the fully parametrized nonlinear model at any operating point, thus facilitating study on engine frequency characteristics and uncertainty of model parameters. In this study the experimental data obtained from the lean burn gas engine of Yanmar AYG20L were used to develop a simulation model suitable for purpose of control algorithm development, also the engine model unit can be used as a part of power plant model facilitating the development of clever load management system.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

返回