Honda Motor Co., Ltd.
OUTBOARD MOTOR

Abstract:

An outboard motor that controls combustion in an engine according to a purification rate by a catalyst and is capable of performing efficient engine combustion. The outboard motor includes a catalyst provided in an exhaust manifold of an engine and a second catalyst provided in an exhaust pipe, an air-fuel ratio sensor and an O2 sensor, which are located on an upstream side and a downstream side of the catalyst, respectively, and a controller for controlling combustion in the engine. The controller calculates an exhaust gas purification rate based on a value detected by the air-fuel ratio sensor or the O2 sensor and controls the combustion in the engine so as to make the exhaust gas purification rate appropriate.