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US 4,733,646 AGranted
Automotive ignition systems
AssigneeAisin Seiki Kabushiki Kaisha
InventorShimichiro Iwasaki
Life of this patent
Estimating the term…
Abstract
An automotive ignition system including an ignition capacitor electrically connected to a primary winding of a ignition transformer for providing energy to a spark plug which is connected to a second winding of the ignition transformer is disclosed. A charge circuit charges the ignition capacitor from a DC-DC voltage converter and includes an inductor and a thyristor. A discharge circuit discharges the ignition capacitor to the primary winding, and a control circuit operates the charge circuit and the discharge circuit in proper timed sequence during a demanded firing duration.
Claims21
An automotic ignition system comprising:
- a spark plug means;
- ignition transformer means having a primary winding and a second winding said second winding being connected to said spark plug means;
- a DC-DC voltage conveter means having a first capacitor for storing a regulated voltage;
- a ignition capacitor means electrically connected to said prmary winding of said ignition transformer means for providing energy to said spark plug means;
- charging means means for charging said ignition capacitor means from said first capacitor;
- discharge means for discharging said ignition capacitor means to said primary winding of said ignition transformer means;
- control means for operating said charging means and said discharging means in proper timed sequence during a demanded firing duration;
- and
- said control means having a detecting means for detecting the on-off state of said discharging means.
6 more elements
An automotive ignition system comprising:
- a spark plug means;
- ignition transformer means having a primary winding and a secondary winding, said secondary winding being connected to said spark plug means;
- a DC-DC voltage conveter means having a first capacitor for storing a regulated voltage;
- a ignition capacitor means electrically connected to said primary winding of said ignition transformer means for providing energy to said spark plug means;
- charge means means for charging said ignition capacitor means from said first capacitor;
- discharge means for discharging said ignition capacitor means to said primary winding of said ignition transformer means, said discharge means being formed with a first thyristor;
- control means for operating said charge means and said discharge means in proper timed sequence during a demanded firing duration;
- and
- said control means having a detecting means for detecting the on-off state of said first thyristor.
6 more elements
An automotive ignition system comprising:
- a spark plug means;
- ignition transformer means having a primary winding and a secondary winding, said secondary winding being connected to said spark plug means;
- a DC-DC voltage converter means having a first capacitor for storing a regulated voltage;
- a ignition capacitor means electrically connected to said primary winding of said ignition transformer mens for providing energy to said spark plug means;
- charging means for charging said ignition capacitor means by said first capacitor;
- discharging means for discharging said ignition capacitor means to said primary winding of said ignition transform means;
- and
- control means for operating said charging means and said discharging means in proper timed sequence during a demanded firing duration, said control means including means for generating a first signal indicating said demanded firing duration in response to the rotational speed of an engine,
- said means for generating said first signal indicating said demanded firing duration including detecting means for detecting a pulse signal indicating the starting time of said demanded firing duration and changing said pulse signal in response to the speed of said engine, memory means for memorizing a second signal in response to said pulse signal, comparator means for comparing the output of said memory means and an output of said detecting means and generating said first signal, and replacing means for replacing said output of said memory means with said output of said detecting means after generating said first signal until a subsequent pulse signal occurs.
6 more elements
An automotive ignition system comprising:
- a spark pug means;
- ignition transformer means having a primary winding and a secondary winding, said secondary winding being connected to said spark plug means;
- a DC-DC voltage converter means having a first capacitopr for storing a regulated voltage;
- a ignition capacitor means electrically connected to said primary winding of said ignition transmformer means for providing energy to said spark plug means;
- charging means including a first inductor and a first thyristor and for charging said ignition capacitor means from said first capacitor;
- discharging means for discharging said ignition capacitor means to said primary winding of said ignition transformer means;
- control means for operating said charging means and said discharging means in proper timed sequence during a demanded firing duration;
- and
- said charging means further including a charge circuit which including a second capacitor for limiting a charge current flowing into said ignition capacitor means through said first inductor and said first thyristor and preventing said ignition capacitor means from over charging and means for limiting a charge current flowing into said second capacitor from said first capacitor, so as to regulate a charged voltage at said ignition capacitor means in no connection with a residual voltage at said ignition capacitor means.
6 more elements
An automotive ignition system comprising:
- a spark plug means;
- ignition transformer means having a primary winding and a secondary winding, said secondary winding being connected to said spark plug means;
- a OC-DC voltage converter means having a first capacitor for storing a regulated voltage;
- a ignition capacitor means electrically connected to said primary winding of said ignition transformer means for providing energy to said spark plug means;
- charging means including a first inductor and a first thyistor and for charging said ignition capacitor means from said first capacitor;
- discharging means for discharging said ignition capacitor means to said primary winding of said ignition transformer means;
- control means for operating said charging means and said discharging means in proper timed sequence during a demanded firing duration;
- and
- said charging means further including a charging circuit for inverting a negative residual voltage at said ignition capacitor means through said first thyristor before charging said ignition capacitor means from said first capacitor through said first inductor at the moment when said first thyristor turned on so as to regulate a charged voltage at said ignition capacitor means in no connection with said negative residual voltage at said ignition capacitor means.
6 more elements
Dependencies are inferred from the claim text.