US3854465A — Electronic ignition system

Claim 1

Independent Claim 310 words

An engine ignition system comprising: an electrical source; first means connected to said source and operable in response to engine operation for generating an impulse signal of predetermined time duration; second means connected to said first means for receipt of said impulse signal and operable to change a square waveform of said impulse signal to a non-linear sloping waveform for said time duration of said impulse signal, said non-linear sloping waveform of said second means terminating upon termination of said square waveform of said impulse signal; third means operatively connected to said second means to vary the gradient of said non-linear sloping waveform within the time duration of said square waveform of said impulse signal to provide a faster or delayed rise of the non-linear sloping waveform from said second means whereby control of the position of a triggering potential therefrom is possible for proper timing of the engine ignition system; fourth means connected to said third means and energized by the triggering potential to generate a signal within the time duration of said impulse signal and displaced in time from the inception of said impulse signal in accordance with the triggering potential on the non-linear sloping waveform to be of a duration of time within said predetermined time duration of said impulse signal of said first means; fifth means connected to said fourth means providing a switching signal within said time duration of said impulse signal of said first means; an ignition coil connected to said electrical source and switching means whereby charging of a primary winding of said coil is controlled by said switching means to control transmission of a high energy potential from a secondary winding of said coil within said time duration of said impulse signal; and spark plug means connected to said coil to be activated by said high energy potential to provide engine ignition.

Claim 2

Dependent Claim 310 words

An engine ignition system comprising: an electrical source; first means connected to said source and operable in response to engine operation for generating an impulse signal of predetermined time duration; second means connected to said first means for receipt of said impulse signal and operable to change a square waveform of said impulse signal to a non-linear sloping waveform for said time duration of said impulse signal, said non-linear sloping waveform of said second means terminating upon termination of said square waveform of said impulse signal; third means operatively connected to said second means to vary the gradient of said non-linear sloping waveform within the time duration of said square waveform of said impulse signal to provide a faster or delayed rise of the non-linear sloping waveform from said second means whereby control of the position of a triggering potential therefrom is possible for proper timing of the engine ignition system; fourth means connected to said third means and energized by the triggering potential to generate a signal within the time duration of said impulse signal and displaced in time from the inception of said impulse signal in accordance with the triggering potential on the non-linear sloping waveform to be of a duration of time within said predetermined time duration of said impulse signal of said first means; fifth means connected to said fourth means providing a switching signal within said time duration of said impulse signal of said first means; an ignition coil connected to said electrical source and switching means whereby charging of a primary winding of said coil is controlled by said switching means to control transmission of a high energy potential from a secondary winding of said coil within said time duration of said impulse signal; and spark plug means connected to said coil to be activated by said high energy potential to provide engine ignition.

Claim 3

Dependent Claim 28 words

The structure of claim 1 wherein said second means is characterized as a RC cornering network including means to clamp a constant voltage of a square wave form.

Claim 4

Dependent Claim 22 words

The structure of claim 2 and further characterized by said third means including a variable resistor connected to said RC cornering network.

Claim 5

Dependent Claim 23 words

The structure of claim 3 wherein said variable resistor''s sliding contact is connected across said first means by a capacitor and discharge diode.

Claim 6

Dependent Claim 56 words

The structure of claim 4 wherein said fOurth means is characterized as a means to re-shape said signal from said third means displaced in time and of a lesser predetermined duration whereby charging of said primary winding is permitted to take place for a substantial constant period of time regardless of fluctuations of said impulse signal.

Claim 7

Dependent Claim 23 words

The structure of claim 1 wherein said second means is further charactirized as an RC cornering network including means to maintain constant voltage.

Claim 8

Dependent Claim 61 words

The structure of claim 1 wherein said third means to vary the gradient of said slope to control the position of a triggering potential includes a variable resistor connected by a capacitor and discharge diode to said second means that changes a squarewave form signal from said first means to said non-linear sloping waveform along which said triggering potential is located.

Claim 9

Dependent Claim 68 words

The structure of claim 6 wherein said means to vary a triggering potential includes a resistor connected to said RC network; and a sliding contact for varying the output of said resistor, said sliding contact being connected by a discharge diode to the constant voltage output of said RC cornering network and by a capacitor to said network in advance of the means therein to maintain constant voltage.

Claim 10

Dependent Claim 72 words

The structure of claim 1 wherein said fourth means connected to said third means to vary the gradient of said slope of said sloping character waveform to advance or retard the time to reach said triggering potential includes: A Schmidt trigger; A differentiation network operably connected to said Schmidt trigger; A one-shot monostable network connected to said diferentiation network; and An amplification and electronic switching means connected to said one-shot monostable network.

Claim 11

Dependent Claim 79 words

The structure of claim 9 wherein said fourth means generates an impulse signal of square wave form similar to but displaced in time and of lesser duration than a square waveform from said first means before decay; said fifth means connected to said fourth means comprises an electronic switching means including normally conducting and non-conducting transistors for controlling said ignition coil; and shunt means connected between said electronic switching means and said ignition coil protecting said electronic switching means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-12-16	1978-06-17	1978-12-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-12-16	1982-06-17	1982-12-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-12-16	1986-06-17	1986-12-17	$7700.00	Window Closed / Lapsed

Electronic ignition system

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