1993 Honda Accord Owner's Manual - Page 164

1993 Honda Accord Manual

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Emission Controls (cont'd) Engine Exhaust Controls The engine exhaust emission control systems are designed to control combustion during idle, acceleration, cruise, and deceleration. These systems are entirely separate from the crankcase and evaporative emission control systems described previously. PGM-FI System The PGM-FI system on this model is a sequential multiport fuel injection. The PGM-FI system consists of three independent subsystems; Air Intake, Engine Control, and Fuel Control, thus allowing more accurate control of air/fuel ratios under all operating conditions. The Engine Control Module (ECM) detects the amount of air drawn into the cylinders and determines the amount of fuel to be injected to provide the optimum air/fuel ratio for all engine needs. Ignition Timing Control System This system automatically controls the ignition timing to reduce the amount of HC and NOx. Three Way Catalytic Converter The catalyst is used to convert hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx) in the exhaust gas, to carbon dioxide (CO2), dinitrogen (N 2 ) and water vapor. Exhaust Gas Recirculation (EGR) System The EGR system is designed to control the formation of oxides of nitrogen (NOx) caused when fuel mixture burns at high temperature. It works by recirculating exhaust gas through the Exhaust Gas Recirculation valve and intake manifold into the combustion chambers where it reduces peak temperature by diluting the air/fuel mixture.

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Emission Controls (cont'd)
Engine Exhaust Controls
The
engine
exhaust
emission
control
systems
are
designed
to
control combustion during idle, acceleration, cruise, and deceleration.
These
systems
are
entirely
separate
from
the
crankcase
and
evaporative emission control systems described previously.
PGM-FI System
The PGM-FI system on this model is a sequential multiport fuel
injection. The PGM-FI system consists of three independent sub-
systems;
Air
Intake,
Engine
Control,
and
Fuel
Control,
thus
allowing
more
accurate
control
of
air/fuel
ratios
under
all
operating conditions. The Engine Control Module (ECM) detects
the amount of air drawn into the cylinders and determines the
amount of fuel to be injected to provide the optimum air/fuel ratio
for all engine needs.
Ignition Timing Control System
This system automatically controls the ignition timing to reduce
the amount of HC and NOx.
Three Way Catalytic Converter
The
catalyst
is
used
to
convert
hydrocarbons
(HC),
carbon
monoxide (CO) and oxides of nitrogen (NOx) in the exhaust gas,
to carbon dioxide (CO
2
), dinitrogen (N
2
) and water vapor.
Exhaust Gas Recirculation (EGR) System
The EGR system is designed to control the formation of oxides of
nitrogen
(NOx)
caused
when
fuel
mixture
burns
at
high
temperature. It works by recirculating exhaust gas through the
Exhaust Gas Recirculation valve and intake manifold into the
combustion
chambers where
it
reduces
peak temperature
by
diluting the air/fuel mixture.