Water jet propulsion watercraft

摘要

A water jet propulsion watercraft includes an exhaust passage, a catalyst member, a water lock, a first oxygen sensor, and a second oxygen sensor. The exhaust passage guides exhaust gas from an engine to an exterior of a hull of the watercraft. The catalyst member is arranged inside the exhaust passage. The water lock is arranged in the exhaust passage downstream of the catalyst member. The first oxygen sensor is arranged in the exhaust passage upstream of the catalyst member. The second oxygen sensor is arranged in the exhaust passage at a position downstream of the catalyst member and upstream of the water lock.

主权项

1. A water jet propulsion watercraft comprising:
a hull; an engine housed in the hull, the engine including a plurality of exhaust ports; a jet propulsion unit arranged to be driven by the engine and configured to draw in water from around the hull and jet the water out; an exhaust passage configured to guide exhaust gas from the engine to an exterior of the hull; a catalytic converter unit including a catalyst member arranged in a catalyst housing of the exhaust passage; a water lock arranged in the exhaust passage downstream of the catalyst member; a first oxygen sensor arranged in the exhaust passage upstream of the catalyst member; and a second oxygen sensor arranged in the exhaust passage at a position downstream of the catalyst member and upstream of the water lock; wherein the exhaust passage includes a first pipe body arranged to face a side surface of the engine and configured to extend in a longitudinal direction of the watercraft; the first oxygen sensor or the second oxygen sensor is arranged at a position higher than a widthwise oriented centerline of the first pipe body and closer to the engine in a widthwise direction of the watercraft than a vertically oriented centerline of the first pipe body when the first pipe body is viewed in a cross-section perpendicular to an axial centerline of the first pipe body; an axial centerline of the catalyst housing extends in the widthwise direction of the watercraft; and the catalyst housing is located rearward of the engine.