System Description
SYSTEM DIAGRAM
| Component parts | Function |
|---|---|
| Crankshaft position sensor 1 | Crankshaft Position Sensor 1 |
| Intake camshaft position sensor | Intake Camshaft Position Sensor |
| Mass air flow sensor (With intake air temperature sensor) | Mass Air Flow Sensor (With Intake Air Temperature Sensor) |
| Engine coolant temperature sensor | Engine Coolant Temperature Sensor |
| Throttle position sensor | Electric Throttle Control Actuator |
| Accelerator pedal position sensor | Accelerator Pedal Position Sensor |
| Battery | ECM receives the battery voltage signal. |
| ECM | ECM (With Barometric Pressure Sensor) |
| VIAS control solenoid valve 1 and 2 | VIAS Control Solenoid Valve 1 and 2 |
SYSTEM DESCRIPTION
In the medium speed range, the ECM sends the ON signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes the power valve. Under this condition, the pressure waves of the exhaust stroke do not disturb the pressure waves of the intake stroke of each opposite bank. Therefore, charging efficiency is increased together with the effect of the long intake passage. However, in the high speed range, the ECM sends the OFF signal to the VIAS control solenoid valve and the power valve is opened. Under this condition, the pressure waves of intake stroke are resonant with those of each opposite bank exhaust stroke. Therefore, charging efficiency is also increased. In addition, both valves 1 and 2 are opened or closed in other ranges mentioned above. Thus maximum charging efficiency is obtained for the various driving conditions.
VACUUM HOSE DRAWING
| Power valve actuator 1 | VIAS control solenoid valve 1 | VIAS control solenoid valve 2 | |||
| Power valve actuator 2 | Intake manifold collector |