| CPC F02M 26/10 (2016.02) [F02B 37/02 (2013.01); F02B 37/22 (2013.01); F02M 26/06 (2016.02); F02M 26/34 (2016.02); F02M 26/47 (2016.02); F02B 39/04 (2013.01)] | 20 Claims |
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1. An exhaust system comprising:
a supercharger including:
a turbine provided in an exhaust pipe of an engine; and
a compressor provided in an intake pipe of the engine, the compressor being coupled to the turbine by a shaft, the supercharger being configured to supercharge intake air using energy of exhaust air;
an exhaust emission control catalyst provided downstream of the turbine in the exhaust pipe;
a first communication path that communicates with the exhaust pipe on a downstream side of the exhaust emission control catalyst, the first communication path communicating with the intake pipe on an upstream side of the compressor, the exhaust pipe and the intake pipe communicating with each other through the first communication path;
a negative pressure generator interposed in the first communication path, the negative pressure generator being configured to generate a negative pressure;
an exhaust sensor provided in the first communication path between the negative pressure generator and a location where the first communication path is coupled to the exhaust pipe;
an exhaust gas recirculation (EGR) pipe that communicates with the exhaust pipe on an upstream side of the exhaust emission control catalyst, the EGR pipe communicating with the intake pipe on the upstream side of the compressor, the EGR pipe being provided separately from the first communication path, the exhaust pipe and the intake pipe communicating with each other through the EGR pipe; and
an EGR valve interposed in the EGR pipe.
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