US5068613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for generating display waveforms im wasted spark ignition systems
Assignee: Snap On Inc
•
Filing: 1988-10-11
•
Granted: 1991-11-26
•
Expires: 2008-10-11
Abstract
Abstract A method and apparatus of developing a stabilized power firing event signal for a cylinder in a wasted spark ignition system having pairs of complementarily connected cylinders, each with a spark plug connected to an opposite end of an independent ignition coil. The first and second firing event signals are developed for each spark plug upon firing of the ignition coil. The first and second signals are combined with like polarity in a summation circuit for eliminating common mode signal portions. The combined signal, which is now stabilized and accurately indicates spark duration, is used for capturing secondary ignition data and may be visually displayed for analysis.
Inventors
- 👤 Keith A. Kreft
- 👤 Michael Dikopf
- 👤 Thomas D. Loewe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:10
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/02; F02P17/04; F02P17/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A method of developing a stabilized firing event signal in a cylinder for a wasted spark ignition system wherein the spark plugs of a pair of complementary cylinders are fired simultaneously from opposite ends of an ignition coil secondary winding, comprising the steps of: obtaining separate firing event signals from the spark plug ignition wires associated with the pair of cylinders; sorting the firing event signals into first, power spark signals and second, wasted spark signals of like polarity; combining the power spark signals and wasted spark signals together to eliminate common mode signal components therefrom; and developing visual displays of power spark signals, wasted spark signals and combined power spark signals and wasted spark signals.
Claim 2
Independent Claim
116 words
A method of developing a stabilized firing event signal in a cylinder for a wasted spark ignition system wherein the spark plugs of a pair of complementary cylinders are fired simultaneously from opposite ends of an ignition coil secondary winding, comprising the steps of: obtaining separate firing event signals from the spark plug ignition wires associated with the pair of cylinders; sorting the firing event signals into first, power spark signals and second, wasted spark signals of like polarity; combining the power spark signals and wasted spark signals together to eliminate common mode signal components therefrom; and developing visual displays of power spark signals, wasted spark signals and combined power spark signals and wasted spark signals.
Claim 3
Dependent Claim
143 words
Apparatus for developing a stabilized firing event signal in a wasted spark ignition system comprising: a first and a second cylinder; first and second spark plugs associated with said first and said second cylinder, respectively; a secondary ignition coil winding having its respective ends coupled to said first and to said second spark plugs; pickup means for developing first and second firing event signals from said first and said second spark plugs upon firing of said ignition coil winding; means for developing from said first and said second firing event signals, a power spark signal and a wasted spark signal of like polarity; means for combining said power spark signal and said wasted spark signal to eliminate common mode signal components therefrom; and means for displaying said power spark signal, said wasted spark signal and said combined power spark and wasted spark signals.
Claim 4
Dependent Claim
143 words
Apparatus for developing a stabilized firing event signal in a wasted spark ignition system comprising: a first and a second cylinder; first and second spark plugs associated with said first and said second cylinder, respectively; a secondary ignition coil winding having its respective ends coupled to said first and to said second spark plugs; pickup means for developing first and second firing event signals from said first and said second spark plugs upon firing of said ignition coil winding; means for developing from said first and said second firing event signals, a power spark signal and a wasted spark signal of like polarity; means for combining said power spark signal and said wasted spark signal to eliminate common mode signal components therefrom; and means for displaying said power spark signal, said wasted spark signal and said combined power spark and wasted spark signals.
Claim 5
Independent Claim
73 words
A method of developing a stabilized firing event signal for a cylinder in a wasted spark ignition system wherein the spark plugs of a pair of complementary cylinders are fired simultaneously from opposite ends of an ignition coil secondary winding comprising the steps of: developing first and second signals from the firing events of the associated pair of cylinders; and combining said first and second signals to eliminate common mode signal components therefrom.
Claim 6
Independent Claim
73 words
A method of developing a stabilized firing event signal for a cylinder in a wasted spark ignition system wherein the spark plugs of a pair of complementary cylinders are fired simultaneously from opposite ends of an ignition coil secondary winding comprising the steps of: developing first and second signals from the firing events of the associated pair of cylinders; and combining said first and second signals to eliminate common mode signal components therefrom.
Claim 7
Dependent Claim
53 words
The method of claim 3 wherein said developing step comprises the step of: obtaining said first and second signals from the spark plug ignition wires associated with said pair of cylinders; and wherein said combining step comprises the step of; supplying said first and second signals with like polarity to a summation circuit.
Claim 8
Dependent Claim
21 words
The method of claim 4, further including the step of developing a visual display of said combined first and second signals.
Claim 9
Dependent Claim
93 words
Apparatus for developing a stabilized firing event signal in a wasted spark ignition system comprising: a first and a second cylinder; first and second spark plugs associated with said first and said second cylinder, respectively; a secondary ignition coil winding having its respective ends coupled to said first and said second spark plug; means developing first and second firing event signals from said first and said second spark plugs upon firing of said ignition coil winding; and means combining said first and said second firing event signals to eliminate common mode signal portions.
Claim 10
Dependent Claim
93 words
Apparatus for developing a stabilized firing event signal in a wasted spark ignition system comprising: a first and a second cylinder; first and second spark plugs associated with said first and said second cylinder, respectively; a secondary ignition coil winding having its respective ends coupled to said first and said second spark plug; means developing first and second firing event signals from said first and said second spark plugs upon firing of said ignition coil winding; and means combining said first and said second firing event signals to eliminate common mode signal portions.
Claim 11
Dependent Claim
30 words
The apparatus of claim 6 wherein said combining means comprise a summation circuit and means for supplying said first and said second signals to said summation circuit with like polarity.
Claim 12
Dependent Claim
43 words
The apparatus of claim 7 wherein said ignition coil winding is connected to said first and said second spark plugs by ignition wires and wherein the means for developing said first and said second signals comprise pickup means associated with said ignition wires.
Claim 13
Dependent Claim
17 words
The apparatus of claim 8, further including means for visually displaying the combined first and second signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |