- 83 -
LP Engine G430(3.0L) LP Fuel System (Low Emission Version)
LP FUEL SYSTEM (LOW EMISSION VERSION)
General Description
System Overivew
CARB(Carlifornia Air Resource Board) emission
compliant G430 LP engine is different from
standard G430 LP engine. To reduce emission of
exhaust gas, closed loop carburetion system and
catalytic muffler are applied to emission compliant
G430 LP engine.
Catalytic muffler reduces the emission level in the
exhaust gas. In order to obtain maximum effect
from the catalyst, an accurate control of the air fuel
ratio is required. The engine controller uses an
exhaust gas oxygen sensor (EGO) in the exhaust
system to send information about exhaust gas
content to the controller. The controller then
calculates any corrections that may need to be
made to the air fuel ratio. The controller makes
these corrections to the air fuel ratio by manipulating
the inlet fuel pressure to the carburetor through the
fuel control valve (FCV). Reducing the fuel
pressure leans the air/fuel mixture. Increasing the
fuel pressure richens the air/fuel mixture.
The controller uses engine exhaust gas oxygen
sensors (EGO), engine speed (tachometer signal)
and manifold absolute pressure sensors (MAP), to
regulate the air/fuel mixtures, correcting for proper
air/fuel. The fuel control valve (FCV) meters air
valve vacuum (AVV) into the atmospheric reference
side of the secondary regulator diaphragm. The
atmospheric reference vent orifice allows for the
controlled depletion of the vacuum over the
diaphragm, this assists the dynamic response of
the diaphragm.
LP Fuel System (Low Emission Version)
To Next Page
Loading...
Need help?
General
