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Experimental Investigation of Close-Loop Control of HCCI Engine Using Dual Fuel Approach
Technical Paper
2013-01-1675
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Homogeneous Charge Compression Ignition (HCCI) offers great
promise for excellent fuel economy and extremely low emissions of
NOx and PM. HCCI combustion lacks direct control on the
"start of combustion" such as spark timing in SI engines
and fuel injection timing in CI engines. Auto ignition of a
homogeneous mixture is very sensitive to operating conditions of
the engine. Even small variations of the load can change the timing
from "too early" to "too late" combustion. Thus
a fast combustion phasing control is required since it sets the
performance limitation of the load control. Crank angle position
for 50% heat release is used as combustion phasing feedback
parameter.
In this study, a dual-fuel approach is used to control
combustion in a HCCI engine. This approach involves controlling the
combustion heat release rate by adjusting fuel reactivity according
to the conditions inside the cylinder. Two different octane fuels
(methanol and n-heptane) are used for the study. Port fuel
injection technique is used for preparing homogeneous mixture of
methanol, heptane and air using two separate injectors for methanol
and heptane. Close loop control of combustion phasing is attained
by instantaneous variation of fuel ratio of methanol and n-heptane
while maintaining the injected fuel energy constant. Total fuel
energy injected is used to control the IMEP of the engine. It is
found that controller is able to keep close track of the reference
combustion phasing using PID control by changing the fuel ratio.
PID control of combustion phasing and IMEP using dual fuel is
achieved and is successfully demonstrated in the HCCI engine in the
study.
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Citation
Maurya, R. and Agarwal, A., "Experimental Investigation of Close-Loop Control of HCCI Engine Using Dual Fuel Approach," SAE Technical Paper 2013-01-1675, 2013, https://doi.org/10.4271/2013-01-1675.Also In
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