EXHAUST GAS RECIRCULATION SYSTEM [SKYACTIV-G 1.5 (WITH EGR COOLER)]SM3020932
EXHAUST GAS RECIRCULATION SYSTEM [SKYACTIV-G 1.5 (WITH EGR COOLER)]

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Purpose, Outline

• The system recirculates the exhaust gas in the combustion chamber and lowers the temperature in the combustion chamber. The following is achieved by recirculating the exhaust gas.
― Fuel economy has been improved by reducing *1 pumping loss, reducing cooling loss, and suppressing temperature increases in the combustion chamber.
― NOx generated when the combustion temperature is high has been reduced by lowering the temperature in the combustion chamber, improving environmental performance.
*1:Due to the decrease in the oxygen level when the exhaust gas is recirculated to the intake side, the further induction of intake air results in reduced pumping loss.
• To perform optimum control according to the engine operation conditions, the EGR valve is opened and the exhaust gas is recirculated based on information such as the estimated exhaust gas pressure and information from the MAP sensor.

Construction


System Diagram

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• The exhaust gas recirculation system consists of the following parts.

Part name

Note

EGR cooler
EGR valve


Operation

• The operation of the exhaust gas recirculation system is as follows.
1. The exhaust gas just after combustion is cooled by the EGR cooler.
2. The EGR valve is operated and the cooled exhaust gas to be recirculated is adjusted based on information such as the estimated exhaust gas pressure and information from the MAP sensor.
3. The exhaust gas passing through the EGR valve is recirculated upstream (intake manifold) of the combustion chamber.
• For EGR control details, refer to CONTROL SYSTEM. (See EGR CONTROL [SKYACTIV-G 1.5 (WITH EGR COOLER)].)