Spark timing control device for internal combustion engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsToshio Takeuchi, Hiroshi Tomita, Takio Ogasawara
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Abstract
An ignition system spark timing controller having circuits for advancing the time at which the ignition system will produce a sparking potential during the starting of the engine, and for maintaining this advanced spark time for a predetermined time period after the engine has started when the temperature of the engine is below a predetermined temperature level during the starting of the engine. The spark timing controller also includes a circuit for advancing the time at which the ignition system will produce a sparking potential when the speed of the engine is below a predetermined speed level after the engine has started.
Claims9
In an ignition system for an internal combustion engine, a spark timing controller, comprising:
- means for advancing the time at which said ignition system will produce a sparking potential during the starting of said engine;
- means for maintaining said advanced spark time for a predetermined time period after said engine has started only if the temperature of said engine is below a predetermined temperature level during the starting of said engine;
- and
- means for advancing the time at which said ignition system will produce a sparking potential when the speed of said engine is below a predetermined speed level.
In an ignition system for an internal combustion engine having means for generating a trigger signal which determined when said ignition system will produce a sparking potential, a spark timing controller, comprising:
- starter circuit means for determining if said engine is being started;
- temperature circuit means for determining if the temperature of said engine is below a predetermined temperature threshold level during the starting of said engine;
- speed circuit means for determining if the speed of said engine is below a predetermined speed threshold level;
- and
- control circuit means for controlling the timing of said trigger signal in response to said starting circuit means, said temperature circuit means and said speed circuit means, such that the timing of said trigger signal is advanced by a predetermined amount when the engine is being started for a time period which is dependent upon whether the temperature of said engine is below said predetermined temperature threshold level, and when the speed of said engine is below said predetermined speed threshold level, wherein said temperature circuit means includes timer circuit means for maintaining the advancement of said trigger signal after said engine has started for a predetermined time period when the temperature of said engine is below said predetermined temperature threshold level during the starting of said engine.
A method of controlling the spark timing of an ignition system for an internal combustion engine, comprising the steps of:
- advancing the time at which said ignition system will produce a sparking potential during the starting of said engine;
- maintaining said spark advance for a predetermined time period after said engine has started if the temperature of said engine is below a predetermined temperature threshold level during the starting of said engine;
- and
- advancing the time at which said ignition system will produce said sparking potential when the speed of said engine is below a predetermined speed threshold level after said engine has started.
Dependencies are inferred from the claim text.