FUNCTION OF MAIN COMPONENTS
The main components of the Exhaust Gas Recirculation (EGR) system are as follows:
| Components | Quantity | Function | |
|---|---|---|---|
| ECM | 1 | Based on the signals received from the sensors, the ECM determines the EGR volume in accordance with the engine operating conditions. | |
| EGR Temperature Sensor | 1 | Detects the EGR gas temperature. | |
| Exhaust Manifold Pressure Sensor | 1 | Detects the exhaust gas pressure in the exhaust manifold. | |
| EGR Valve Assembly | EGR Valve | 1 | Actuated by the ECM, this valve controls the flow rate of EGR gas. |
| EGR Valve Position Sensor | 1 | Detects the EGR valve position. | |
| EGR Cooler Assembly | EGR Cooler | 1 | Cools EGR gas. |
| EGR Cooler Bypass Switching Valve | 1 | Actuated by the ECM via the EGR bypass valve switching valve, this valve switches the flow passage of EGR gas in 2 stages. | |
SYSTEM CONTROL
Based on the signals received from the sensors, the ECM determines the EGR volume via the EGR valve and EGR cooler bypass switching valve in accordance with the engine operating conditions.
FUNCTION
This system is designed to help reduce and control NOx formation, due to a peak temperature reduction in the engine combustion chamber, which is accomplished by the introduction of amounts of inert gas into the intake manifold.
By sensing the engine driving conditions and actual EGR valve opening amount, the ECM electrically operates the EGR valve assembly. As a result, the amount of recirculating exhaust gas is regulated.
The ECM switches the bypass passage of the EGR cooler assembly via the EGR bypass valve switching valve in order to optimize the temperature of the EGR gas and clean exhaust gases.