Modeling of a new fuel injection system with a direct-injection diesel engine
Technical Paper
2000-05-0023
Sector:
Language:
English
Abstract
This working proposes to analyze - by modeling and
computer-assisted simulation - a new injection system, able to
increase fuel pressure entering the injector up to values of about
100 MPa, without special requirements concerning the stuff quality
or technology.
The new high-pressure injection system for diesel engines is a
rotary- distributor pump, of which classical proceeding of the fuel
intake control was replaced by the control of delivery''s
end.
A mathematical simulation of a development of the injection
process implies to structure the calculation program so that the
particular aspect of adjustment proceeding be revealed.
Pump''s space should be divided into two volumes. The
first volume represents rotor''s inner space. The second
one contains an assembly: delivery valve and afferent related
canals.
For either sector, the limit conditions comprise: equation of
continuity referring to mass, and equation of dynamic equilibrium
of the pieces with free motion. The result system of equations is
solved after Runge-Kutta method of the fourth order.
The calculation program offers information hard to acquire
experimentally: the contact effort of roller-cam and lug-guiding;
the diagram of plunger''s displacement.