| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas control system which can reduce an amount of NOx exhausted to the outside in an exhaust gas control system provided with an NOx purification catalyst for absorbing and decomposing NOx. SOLUTION: In an engine 1 provided with an EGR gas circulation passage 20 having an EGR valve 21, an NOx purifying device 10 formed of an NOx purification catalyst 11 for absorbing and decomposing NOx in an exhaust gas G and a heating device 12 for heating the NOx purification catalyst 11 so as to decompose and emit NOx absorbed in the NOx purification catalyst 11 is provided in an exhaust passage 3 in the upstream of a position 20b where the EGR gas circulation passage 20 branches. |
