Car, has exhaust manifold for discharging exhaust gas through exhaust duct having gas treatment system provided with catalyst, and catalyst isolation device placed between catalyst and upstream of fresh air intake manifold

摘要

The car has an internal combustion engine i.e. petrol engine (10) having a cylinder (11), a fresh air intake manifold (12) for supplying fresh air to the cylinder, and an exhaust manifold (13) for discharging exhaust gas from the combustion through an exhaust duct (16) having a gas treatment system provided with a catalyst (17). A catalyst isolation device (19) is placed between the catalyst and upstream of the intake manifold. The gas treatment system includes a closed chamber (18a) surrounding the catalyst.