1987-Montero · Fuel System Carb a · страница 19 из 86 · Открыть оригинал PDF ↗
N140TM
Auxiliary Accelerator Pump (AAP)
The Auxiliary Accelerator Pump is provided to improve driveability
while the engine is still cold. AAP is controlled by a thermo-valve
and intake manifold vacuum and operates in the high load range
while the coolant temperature is low (approx. 45”C/113”F).
The thermo-valve is of the bi-metal type and is mounted on the
intake manifold. The valve opens when the engine coolant tem-
perature is below 45°C (113°F) and allows the manifold vacuum to
affect AAP chamber [A]. The valve closes when the coolant tem-
perature exceeds 45°C (113°F) to shut off the manifold vacuum
and stop the operation of the AAP.
The manifold vacuum operates on AAP chamber [Al. When the
diaphragm moves to the right, the fuel pushes check valve 1 open,
flows into and fills chamber [B]. When the throttle valve opens
quickly and the vacuum in chamber [A] lowers, the diaphragm is
pushed to the left by spring pressure. As a result, the fuel in
chamber [B] pushes open check valve 2 and jets into the carbu-
retor, enriching the fuel mixture.
NllBJAA
The dash pot delays closing of the throttle valve when it closes
from the set opening to the idle opening. This delay absorbs shock
at the time of deceleration for better driving comfort.
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