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Injection process is vital importance to combustion process in
diesel engine. Injection parameters(injection timing, pressure
and rate) in the injection process more straight affect
combustion process and performance. Hence, the relation of
injection parameters to combustion process require being
realized so as to obtain heigher performance and controllable
exhaust emissions of diesel engine. This project tries to change
injection parameters matching engine speeds and loads for the
purpose of investigating the influence of injection parameters
on the engine combustion process.The reserch method is to
construct injection mechanism to change injection parameters and
measuring system to sample exhaust emission for the current
engine. Experimental measurement are performent by changing
injection parameters under engine loads and speeds. Cylinder gas
pressure, fuel line pressure, needle lift, fuel consumption, air
flow rate, smoke, , CO/HC emissions e.t.c. are recorded.
Cylinder gas pressure, fuel line pressure, needle lift and crank
angle data in multiple cycles are obtained by high-speed data
acquistion system in short time. Then, these data are
transported into computer analysis system by sampling
conditionally; heat-release rate program of diesel engine are
also established by considering ignition delay in spray
combustion model emplemented into thermodynamic analysis model.
The project is to investigate the influence of different
injection parameters on heat release rate and exhaust emission
under engine operating conditions .
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