Patent ID: 6913495
Filing Date: 2005-07-05
Classification: B63B,B63H,F01M,F02B

Abstract:
1. A small watercraft comprising: a four-cycle engine; an engine speed sensor configured to output a speed signal according to an engine speed of the engine; a hydraulic-pressure sensing device configured to output a pressure signal according to a pressure of oil that circulates within the engine; and an electric control unit including a detecting portion configured to detect the engine speed of the engine based on the speed signal and the pressure of the oil based on and the pressure signal to compare a threshold of the pressure of the oil preset according to the engine speed to the pressure of the oil, and to output an abnormality signal, and a control portion configured to control the watercraft according to the abnormality signal from the detecting portion, wherein the detecting portion has a plurality of detection modes, each of which is defined by a plurality of engine speed ranges, including predetermined numerical ranges, and the threshold is constant in each of the detection modes and increases with increasing engine speed range, wherein in each of the detection modes, the detecting portion outputs the abnormality signal to the control portion when detecting that the engine speed is in the engine speed range corresponding to the detection mode and the pressure of the oil is not more than the threshold corresponding to the detection mode.