OTHER
CONTROL SYSTEMS - T-VI
S
T-VIS (TOYOTA-VARIABLE INDUCTION SYSTEM
)
GENERA
L
a
. The intake manifold passage leading to each
cylinder is divided into two parts
. One of
these (the variable induction passage) is
provided with an intake air control valve
.
This valve opens and closes in accordance
with the speed of the engine, thus acting as
a variable induction valve
. This makes it
possible to improve engine performance in
the low-speed range without sacrificing the
high engine speed and output that are
distinctive features of engines with four
valves per cylinder
.
VS
V
Intake manifol
d
(air intake chamber)
T-VIS
b
. The intake air control valves for all cylinders
are constructed as one unit, and are opened
and closed together by an actuator
.
c
. The
improvement in the pe
rf
ormance of the
engine due to the adoption of T-VIS is shown
in the graph below
.
OHP 8
8
Low
Engine speed --- High
OHP 8
8
OHP 8
8
Engine
EC
U
124
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