Exhaust system for engine

An exhaust system provided to an engine having an output shaft extending in a front-and-rear direction of a vehicle, comprising:

• an exhaust passage through which exhaust gas discharged from the engine circulates;
• a turbocharger having a turbine housing, the turbine housing being formed therein with a passage through which exhaust gas passes and configured to accommodate a turbine wheel being driven by exhaust gas;
• and
• a first purifying part and a second purifying part configured to purify exhaust gas,
• wherein the exhaust passage includes:
• a first passage part connected to a downstream end of the turbine housing;
• a second passage part having the first purifying part therein and connected to a downstream end of the first passage part;
• a third passage part connected to a downstream end of the second passage part;
• and
• a fourth passage part having the second purifying part therein and connected to a downstream end of the third passage part,
• wherein the first passage part extends forward from the turbine housing,
• wherein the fourth passage part extends in the front-and-rear direction below the turbine housing,
• wherein the second passage part is disposed at a location between the first passage part and the third passage part in an up-and-down direction so that the second passage part extends in the up-and-down direction and a center axis thereof inclines forward and upward,
• wherein the third passage part has a downstream connecting part extending forward from a front end part of the fourth passage part, and an upstream connecting part extending forward and upward from an upper part of a front end part of the downstream connecting part,
• wherein the downstream connecting part has an attaching part provided to a lower part of the front end part thereof and extending downwardly from a lower edge of the upstream connecting part,
• wherein one of a sensor configured to detect a property of exhaust gas and an injector configured to inject fluid into exhaust gas is attached to the attaching part,
• wherein each of the first purifying part and the second purifying part is at least one of a catalyst or a filter;
• wherein a lower surface of the upstream connecting part bulges downwardly and is provided with the lower edge curving toward an interior of the third passage part,
• wherein the one of the sensor configured to detect a property of exhaust gas and the injector configured to inject fluid into exhaust gas is provided on a lower side of the lower edge,
• wherein the lower surface of the upstream connecting part curves along a curved surface bulging downwardly, and
• wherein one of the sensor and the injector has a tip-end part projecting into the third passage part, below a tangent of the curved surface, the tangent passing through the lower edge of the upstream connecting part and extending in the front-and-rear direction, thereby preventing the tip-end part from becoming wet from condensed water generated from exhaust gas.