Cylinder discriminating device and method thereof, and engine ignition control device and method thereof

A cylinder discriminating device of an engine, the engine including:

• a crank rotor including a plurality of tooth portions arranged at regular intervals, and first and second non-tooth portions asymmetrically positioned on a periphery of the crank rotor, wherein the first non-tooth portion is positioned to correspond to a top dead center of a specific cylinder;
• and
• a cam rotor including a tooth portion on a periphery of the cam rotor, which is positioned to correspond to a predetermined interval between the first and second non-tooth portions of the crank rotor, the cylinder discriminating device comprising:
• a cylinder discriminating section that discriminates the specific cylinder by detecting the first non-tooth portion based on number of the tooth portions of the crank rotor detected by the cylinder discriminating section and by detecting whether or not the cylinder discriminating section detects the tooth portion of the cam rotor during a predetermined time period.

A cylinder discriminating method comprising:

• discriminating a specific cylinder of an engine, wherein:
• a crank rotor includes a plurality of tooth portions arranged at regular intervals, and first and second non-tooth portions asymmetrically positioned on a periphery of the crank rotor, the first non-tooth portion positioned to correspond to a top dead center of the specific cylinder;
• a crank signal is outputted when the cylinder discriminating section detects each of the plurality of the tooth portions;
• a cam signal is outputted when the cylinder discriminating section detects a predetermined tooth portion on a periphery of a cam rotor;
• and
• the specific cylinder is discriminated by detecting the first non-tooth portion based on number of the crank signals detected during a time period from a time when one of the first and second non-tooth portions is detected to a time when the other of the first and second non-tooth portions is detected, and by detecting whether or not the cylinder discriminating section detects the cam signal during the same time period.

A cylinder discriminating method of an engine, the engine including:

• a crank rotor including a plurality of tooth portions arranged at regular intervals, and first and second non-tooth portions asymmetrically positioned on a periphery of the crank rotor, wherein the first non-tooth portion is positioned to correspond to a top dead center of a specific cylinder;
• and
• a cam rotor including a tooth portion on a periphery of the cam rotor, which is positioned to correspond to a predetermined interval between the first and second non-tooth portions of the crank rotor, the cylinder discriminating method comprising:
• discriminating the specific cylinder by detecting the first non-tooth portion based number of the tooth portions of the crank rotor detected and by detecting whether or not the cylinder discriminating section detects the cam signal during a predetermined time period.