Patent ID: 6810724
Filing Date: 2004-11-02
Classification: F02B,F02D,F02P,G01P

Abstract:
A system for detecting reverse rotation of a 4-cycle internal combustion engine having three or more cylinders for an outboard motor mounted on a boat, whose output is connected to a propeller such that the boat is propelled forward or reverse, comprising:cylinder identifying means for identifying the cylinders of the engine; crank angle pulse generating means for generating a predetermined number of crank angle signals in a predetermined range of crank angles; counting means for counting the number of the crank angle singles; multiple count determining means for determining whether the counted value is a multiple of the predetermined number, when the cylinders are identified; and engine reversing determining means for determining that engine rotates reverse when the counted value is determined to be not the multiple of the predetermined number and for stopping the engine.