Apparatus and method for ignition timing for small gasoline engine
OwnerJorgen Bengtsson, Gren Styrbjorn +1inventors
InventorsJorgen Bengtsson, Gren Styrbjorn, Bert Gustafsson
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Abstract
An apparatus and method for use with an internal combusting engine that accurately control ignition timing. Reference signals are created which are used to determine both the mean engine speed as well as irregular speed. Control logic uses this engine information to accurately predict the future rotational position of the engine. The ignition timing is then adjusted to release the spark at the appropriate time.
Claims33
An ignition timing system comprising:
- circuitry including control logic;
- a movable magnet;
- a coil mounted such that movement of said movable magnet generates a voltage in said coil, said voltage crossing a voltage threshold at least two times during movement of said movable magnet;
- a first reference signal generated by said circuitry, said first reference signal having a leading edge corresponding to a first threshold crossing and a trailing edge corresponding to a second threshold crossing;
- and
- said reference signal being utilized by said control logic to determine a variable spark time delay.
An ignition timing system comprising:
- circuitry including control logic;
- a movable magnet mounted on a flywheel;
- a coil mounted such that movement of said movable magnet generates a voltage in said coil, said voltage crossing a voltage threshold at least four times during movement of said movable magnet;
- a first reference signal generated by said control logic circuitry, said first reference signal having a leading edge corresponding to a first zero crossing and a trailing edge corresponding to a second zero crossing;
- a second reference signal generated by said control logic circuitry, said second reference signal having a leading edge corresponding to a third zero crossing and a trailing edge corresponding to a fourth zero crossing;
- a reset signal generated by said circuitry during cranking;
- and
- said circuitry utilizing at least two of said first reference signal, said second reference signal and said reset signal to determine a variable spark time delay.
A method for controlling an ignition timing system, said method comprising steps of:
- (a) generating a voltage in a coil with a magnet mounted on a rotating flywheel;
- (b) detecting a first threshold crossing and a second threshold crossing of said voltage;
- (c) generating a first reference signal with a leading edge corresponding to said first threshold crossing and a trailing edge corresponding to said second threshold crossing;
- (d) detecting a third threshold crossing and a fourth threshold crossing of said voltage;
- (e) generating a second reference signal with a leading edge corresponding to said third threshold crossing and a trailing edge corresponding to said fourth threshold crossing;
- and
- (f) determining a variable spark time delay based on said first reference signal and said second reference signal.
A method for determining speed of an internal combustion engine, said method comprising steps of:
- (a) generating a voltage in a coil with a magnet mounted on a rotating flywheel;
- (b) detecting a first threshold crossing and a second threshold crossing of said voltage;
- (c) generating a first reference signal with a leading edge corresponding to said first threshold crossing and a trailing edge corresponding to said second threshold crossing;
- (d) detecting a third threshold crossing and a fourth threshold crossing of said voltage;
- (e) generating a second reference signal with a leading edge corresponding to said third threshold crossing and a trailing edge corresponding to said fourth threshold crossing;
- and
- (f) determining engine speed based on at least one of said reference signals.
Dependencies are inferred from the claim text.