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 . |
| Engine coolant temperature sensor 1 | Engine Coolant Temperature Sensor . |
| Air fuel ratio (A/F) sensor 1 | Air Fuel Ratio (A/F) Sensor 1 . |
| Throttle position sensor | Electric Throttle Control Actuator . |
| Accelerator pedal position sensor | Accelerator Pedal Position Sensor . |
| Battery | ECM detects the battery voltage. |
| Fuel tank temperature sensor | Fuel Tank Temperature Sensor . |
| EVAP control system pressure sensor | EVAP Control System Pressure Sensor . |
| Combination meter | ECM receives the vehicle speed signal via CAN communication. |
| ECM | ECM . |
| EVAP canister purge volume control solenoid valve | EVAP Canister Purge Volume Control Solenoid Valve . |
| EVAP canister electric purge pump | EVAP Canister Electric Purge Pump . |
SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister. The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated charcoals and the vapor is stored there when the engine is not operating or when refueling to the fuel tank. The vapor in the EVAP canister is purged by the air through the purge line to the intake air duct when the engine is operating. EVAP canister purge volume control solenoid valve and EVAP canister electric purge pump are controlled by ECM. When the engine operates, EVAP canister electric purge pump rotates in several operation mode and the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as the air flow increases. EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.
Supercharged Purge System
When the engine rotates the ECM operates the EVAP canister electric purge pump to purge evaporative gas from the canister to the intake manifold. The ECM calculates the operating conditions and the estimated value of the purge gas concentration, and gradually controls the rotation speed of the EVAP canister electric purge pump, As a result, the evaporative gas can be reliably purged even when the negative pressure of the intake manifold is insufficient.