US3908616A — Ignition device for use in internal combustion en…

Claim 1

Independent Claim 205 words

An ignition device for an internal combustion engine comprising: an ignition coil having a primary winding and a secondary winding; switching means provided in series with said primary winding of said ignition coil for introducing electric current to said primary winding from a DC power supply and for interrupting it; pulse producing means for producing pulses having a duration corresponding to a predetermined engine crank angle; first clock means for producing a first clock signal; second clock means for producing a second clock signal; first counting means for counting the first clock signal from said first clock means during a time period corresponding to the duration of the pulses from said pulse producing means; second counting means for counting the second clock signal from said second clock means responsive to the fact that the production of pulses by said pulse producing means is stopped ; means for detecting the fact that the difference between the count value of said first counting means and the count value of said second counting means reaches a predetermined value; and control means for on-off controlling said switching means responsive to the output of said detecting means thereby generating a high voltage at the secondary winding of said ignition coil.

Claim 2

Dependent Claim 205 words

An ignition device for an internal combustion engine comprising: an ignition coil having a primary winding and a secondary winding; switching means provided in series with said primary winding of said ignition coil for introducing electric current to said primary winding from a DC power supply and for interrupting it; pulse producing means for producing pulses having a duration corresponding to a predetermined engine crank angle; first clock means for producing a first clock signal; second clock means for producing a second clock signal; first counting means for counting the first clock signal from said first clock means during a time period corresponding to the duration of the pulses from said pulse producing means; second counting means for counting the second clock signal from said second clock means responsive to the fact that the production of pulses by said pulse producing means is stopped ; means for detecting the fact that the difference between the count value of said first counting means and the count value of said second counting means reaches a predetermined value; and control means for on-off controlling said switching means responsive to the output of said detecting means thereby generating a high voltage at the secondary winding of said ignition coil.

Claim 3

Dependent Claim 25 words

An ignition device according to claim 1, further comprising means for adjusting the ratio between the repetition rates of said first and second clock signals.

Claim 4

Dependent Claim 15 words

An ignition device according to claim 2, in which said control means includes a univibrator.

Claim 5

Dependent Claim 162 words

An ignition device for an internal combustion engine, comprising: an ignition coil having a primary winding and a secondary winding; a switching means connected in series with said primary winding of said ignition coil for introducing electric current from a D.C. power supply and for interrupting it; pulse producing means for producing pulses having a duration corresponding to a predetermined engine crank angle; first clock means for producing a first clock signal; second clock means for producing a second clock signal; counting means for counting up the first clock signal from said first clock means responsive to pulses from said pulse producing means and for counting down the second clock signal from said second clock means responsive to pulses from said pulse producing means; detecting means delivering an output in response to the fact that the count-down value of said counting means reaches a predetermined value; and control means for controlling said switching means responsive to the output of said detecting means.

Claim 6

Dependent Claim 162 words

An ignition device for an internal combustion engine, comprising: an ignition coil having a primary winding and a secondary winding; a switching means connected in series with said primary winding of said ignition coil for introducing electric current from a D.C. power supply and for interrupting it; pulse producing means for producing pulses having a duration corresponding to a predetermined engine crank angle; first clock means for producing a first clock signal; second clock means for producing a second clock signal; counting means for counting up the first clock signal from said first clock means responsive to pulses from said pulse producing means and for counting down the second clock signal from said second clock means responsive to pulses from said pulse producing means; detecting means delivering an output in response to the fact that the count-down value of said counting means reaches a predetermined value; and control means for controlling said switching means responsive to the output of said detecting means.

Claim 7

Dependent Claim 100 words

An ignition device according to claim 4, further comprising first gate means adapted to deliver the first clock signal when receiving a pulse from said pulse producing means and second gate means adapted to deliver the second clock signal when receiving no pulse from said pulse producing means, wherein said counting means counts up the first clock signal fed thereto through said first gate means during the presence of the output of said pulsE producing means and counts down the second clock signal fed thereto through said second gate means when the output of said pulse producing means has ceased.

Claim 8

Dependent Claim 23 words

An ignition device according to claim 5, in which said control means includes a univibrator for producing second pulses having a predetermined duration.

Claim 9

Dependent Claim 25 words

An ignition device according to claim 6, further comprising means for adjusting the ratio between the repetition rates of said first and second clock signals.

Claim 10

Dependent Claim 30 words

An ignition device according to claim 7, in which said detecting means includes gates each adapted to be fed with its associated one of the bits, of said counting means.

Claim 11

Dependent Claim 211 words

In an ignition device for an internal combustion engine including an ignition circuit to which a control signal for controlling the application of ignition energy is applied, the improvement comprising: first means for generating first pulses, each of which has a duration corresponding to a prescribed crank angle of the engine; second means for generating first and second clock signals, at first and second respective clock frequencies; third means, coupled to said first and second means, for counting the number of said first clock pulse signals produced by said second means for the duration of a first pulse generated by said first means, and for counting the number of said second clock pulse signals produced by said second means beginning with the termination of said first pulse; and fourth means, coupled to said third means, for comparing the number of first clock pulse signals counted by said third means for the duration of said first pulse with the number of second clock pulse signals counted by said third means beginning with the termination of said first pulse and for providing a control signal to said ignition circuit in response to the difference in the numbers of first and second clock pulse signals counted by said third means reaching a prescribed number.

Claim 12

Dependent Claim 211 words

In an ignition device for an internal combustion engine including an ignition circuit to which a control signal for controlling the application of ignition energy is applied, the improvement comprising: first means for generating first pulses, each of which has a duration corresponding to a prescribed crank angle of the engine; second means for generating first and second clock signals, at first and second respective clock frequencies; third means, coupled to said first and second means, for counting the number of said first clock pulse signals produced by said second means for the duration of a first pulse generated by said first means, and for counting the number of said second clock pulse signals produced by said second means beginning with the termination of said first pulse; and fourth means, coupled to said third means, for comparing the number of first clock pulse signals counted by said third means for the duration of said first pulse with the number of second clock pulse signals counted by said third means beginning with the termination of said first pulse and for providing a control signal to said ignition circuit in response to the difference in the numbers of first and second clock pulse signals counted by said third means reaching a prescribed number.

Claim 13

Dependent Claim 25 words

The improvement according to claim 9, wherein said second means includes means for varying the relative frequencies of said first and second clock pulse signals.

Claim 14

Dependent Claim 50 words

The improvement according to claim 9, wherein said fourth means includes means for generating a control signal having a specified duration beginning with the instant of detection of the difference in the number of said first and second clock pulse signals counted by said third means reaching said prescribed number.

Claim 15

Dependent Claim 79 words

The improvement according to claim 9, wherein said third means comprises an up-down counter and a first gate circuit having a first input coupled to said first means and a second input coupled to receive said first clock pulse signals from said second means and an output connected to said counter, so as to gate said first clock pulse signals to be counted up by said up-down counter for the duration of said first pulse from said first means.

Claim 16

Dependent Claim 91 words

The improvement according to claim 12, wherein said third means further comprises a second gate circuit having a first inverted input coupled to said first means and a second input coupled to receive the output of said first means and a second input coupled to receive said second clock pulse signals from said second means and an output connected to said counter, so as to gate said second clock pulse signals to be counted down by said up-down counter beginning with the termination of said first pulse from said first means.

Claim 17

Dependent Claim 25 words

The improvement according to claim 13, wherein said second means includes means for varying the relative frequencies of said first and second clock pulse signals.

Claim 18

Dependent Claim 50 words

The improvement according to claim 14, wherein said fourth means includes means for generating a control signal having a specified duration beginning with the instant of detection of the difference in the numbers of said first and second clock pulse signals counted by said third means reaching said prescribed number.

Claim 19

Dependent Claim 25 words

The improvement according to claim 11, wherein said second means includes means for varying the Relative frequencies of said first and second clock pulse signals.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-09-29	1979-03-31	1979-09-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-09-29	1983-03-31	1983-09-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-09-29	1987-03-31	1987-09-30	$7700.00	Window Closed / Lapsed

Ignition device for use in internal combustion engine

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