System Description
SYSTEM DIAGRAM
| Component parts | Function |
|---|---|
| Crankshaft position sensor | Crankshaft Position Sensor . |
| Intake camshaft position sensor | Intake Camshaft Position Sensor . |
| Mass air flow sensor | Mass Air Flow Sensor . |
| Intake air temperature sensor 1 | Mass Air Flow Sensor . |
| Intake air temperature sensor 2 | Turbocharger Boost Sensor (With Intake Air Temperature Sensor 2) . |
| Engine coolant temperature sensor 1 | Engine Coolant Temperature Sensor . |
| Throttle position sensor | Electric Throttle Control Actuator . |
| Accelerator pedal position sensor | Accelerator Pedal Position Sensor . |
| Turbocharger Boost Sensor | Turbocharger Boost Sensor (With Intake Air Temperature Sensor 2) . |
| ECM | ECM . |
| Electric wastegate control actuator | Turbocharger . |
| Turbocharger bypass control valve |
SYSTEM DESCRIPTION
ECM controls the electric wastegate control actuator according to driving conditions. The rod connected to the electric wastegate control actuator controls turbocharger boost by changing the angle of the wastegate valve in the exhaust side turbine. ECM determines a target boost pressure based on engine speed, accelerator pedal position, and throttle valve position. ECM then calculates intake air pressure around the turbine entrance according to the amount of intake air and intake air pressure. Based on this information, ECM determines the wastegate valve angle to satisfy the target boost pressure. The electronically-controlled wastegate control actuator enables the adjustment of wastegate valve angle, allowing the improvement of the response to driving conditions and the achievement of high-precision boost pressure control. When the engine is cold, the wastegate valve is opened and heat loss caused by turbocharger is minimized to accelerate the warm-up (activation) of catalyst. This allows the wastegate valve to be opened in non-supercharging regions and improves the fuel economy by reducing piston pumping loss. In addition, the adoption of the electronically-controlled turbocharger bypass control valve quickly starts opening the bypass valve when releasing the accelerator pedal, and accordingly this reduces surge sound generated by the back flow of supercharged air to the compressor fin.