Formation of Static Characteristics of a Diesel Engine

Abstract

The introduction of modern diesel fuel supply systems and the use of electronic components in control systems provide new possibilities for shaping engine characteristics targeted at specific energy consumers. Under these conditions, the type of engine characteristics is determined by the operation of the air supply system. This work examines the formation of static characteristics for a promising D500 diesel engine for train and ship power plants. Modeling of the diesel operation modes is carried out on computer models in the MATLAB/Simulink and Diesel-RK software packages. Variants of the full-load curves of the diesel engine are presented for different ways of turbocharger control: using a turbine of variable geometry and with sequential turbocharging. The fuel supply is limited according to the air-fuel ratio and the maximum pressure in the engine cylinders. For a variable geometry turbine, a matrix of the positions of the guide vane blades is obtained from the condition of optimizing diesel modes for fuel efficiency. Possibilities to obtain the efficiency characteristic that would provide the minimal fuel consumption for train and ship power plants are shown.

Influence of Time Delays on Network-Controlled Diesel Generator Performance

“…Modeling of the control systems operation is done by replacing a continuous regulator with a digital one, which is implemented in software as a digital state machine in a micro regulator, as well as by varying the time intervals between the variation of the state machine states. Models of the synchronous generator and diesel engine excitation system developed in the Matlab Simulink dataset [27,28] are presented in Figure 2. The reference value of the excitation voltage is set at the input Vref of the adder, and the actual value of the generator voltage is input to the input Vsdq, after which a positive sequence voltage is formed, which is fed to the input of the low-pass filter, which is represented by a 1 st -order aperiodic link with a time constant of 0.02 s, which corresponds to the period of mains voltage.…”