Abstract
Rather obsolete, mechanical governors are still used in an enormous number of existing and even some new diesel engine injection systems. Change of a governor characteristic and adapting to a specific engine application is possible through adjustments of governor's elements. In order to achieve fast and accurate evaluation of adjustable parameters, mathematical model of a governor is introduced. This paper deals with the impact of adjustable parameters on static and dynamic characteristics of the mechanical variable-speed governor in DPA distributor type fuel injection pump. Dynamic testing of a closed loop Diesel engine - governor - injection system is conducted within comprehensive 1D multidomain simulation environment.
Highlights
Basic Diesel engine control is firmly related to its speed governing
The closed-loop simulation of the diesel engine and speed governing system, in this paper, is based on the co-simulation of several complex mathematical models gathered in SimulinkTM environment: Figure 6
The amount of fuel injected into the cylinder of a diesel engine depends on many factors, and it is influenced by various complex processes in the fuel-injection system
Summary
Basic Diesel engine control is firmly related to its speed governing. The actual engine working point is determined by equilibrium of, two mainly opposing torques, i.e. external load and effective engine torque. There are stable and unstable areas of engine behaviour within its working range, but in neither of these, it is impossible to maintain engine speed satisfactory without an appropriate engine speed governing system Diesel engines, with their moderate torque gradient, are demanding in the engine speed governing. A given type of mechanical governing system has a limited number of adjustable parameters which, optimized, can be adapted to specific engine and its demands. Adjustment of these parameters is, and very often in practice, realised through engineer's or technician's experience, skill and “feeling” – not with the engineering determinacy as it should be. The model can be used as an engineering tool for investigating the influences of various parameters of the governor’s design on its functioning
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