System Description
INPUT/OUTPUT SIGNAL CHART
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor | Engine speed and piston position | Exhaust valve timing control | Exhaust valve timing control solenoid valve |
| Camshaft position sensor | |||
| Engine oil temperature sensor | Engine oil temperature | ||
| Exhaust valve timing control position sensor | Exhaust valve timing signal | ||
| Combination meter | Vehicle speed * |
* : This signal is sent to the ECM via the CAN Communication line
SYSTEM DESCRIPTION
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine oil temperature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the exhaust valve to increase engine torque and output in a range of high engine speed.