ACIS Acoustic Control Induction System General

The ACIS is realized by using a bulkhead to divide the intake manifold into 2 stages, with an intake air control valve in the bulkhead being opened and closed to vary the effective length of the intake manifold in accordance with the engine speed and throttle valve opening angle. This increases the power output in all ranges from low to high speed.

Engine

Speed Throttle Opening Angle

Engine

Speed Throttle Opening Angle

Acoustic Control Induction System

Construction

1) Intake Air Control Valve

The intake air control valve, which is provided in the intake air chamber, open and close to change the effective length of the intake manifold in 2 stages.

2) Actuator (Motor)

The actuator activates the intake air control valve based on signals from the ECM.

Intake Air Control Valve

Intake Air Control Valve

Toyota Acis

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