1992 Honda Accord Owner's Manual - Page 154

1992 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 consists of three independent sub-systems; Air Intake, Electronic Control, and Fuel Control, thus allowing more accurate control of air/fuel ratios under all operating conditions. The Electronic Control Unit (ECU) 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. 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 (N2) and water vapor. Exhaust Gas Recirculation (EGR) 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 EGR 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 consists of three independent sub-systems;
Air Intake, Electronic Control, and Fuel Control, thus allowing
more
accurate
control
of
air/fuel
ratios
under
all
operating
conditions. The Electronic Control Unit (ECU) 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.
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)
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
EGR valve and intake manifold into the combustion chambers
where it reduces peak temperature by diluting the air/fuel mixture.