EP0297584A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ignition system for internal combustion engine
Assignee: Offta Pubco Licza Uso Non Esclusivo Offerta Lic
•
Filing: 1988-06-30
•
Granted: —
•
Expires: 2008-06-30
Abstract
Abstract A high-energy ignition system for an internal combustion engine in which both magnetic and electrical energy stored in an energy storage coil (3) and in a capacitor (13) are supplied to the primary winding (10a) of an ignition coil (10) at a predetermined timing. When a first or second switching device (6, 11) is turned off, the capacitor (13) is charged with the energy stored in advance in the energy storage coil (3), and upon subsequent turning on of the first switching device (6), energy is stored in the energy storage coil (3) from a DC power supply. At substantially the same time as the turning off of the first switching device (6) at an ignition timing, the second switching device (11) is turned on to supply the primary winding (10a) with the energy stored in the energy storage coil (3) and the capacitor (13). Alternatively, the capacitor (13) is charged with the energy stored in advance in the energy storage coil (3) through the primary winding (10a) of the ignition coil (10) and a charging diode (12) at the time of turning off of the second switching device (11). The first and second switching devices (6, 11) operate similarly to supply the primary winding (10a) through a discharging diode (9, 14) with the energy stored in the energy storage coil (3) and the capacitor (13).
Inventors
- 👤 Seiji Morino
- 👤 Satoru Kawamoto
- 👤 Yoshihiro Yoshitani
- 👤 Toshio Sugimoto
- 👤 Toshio Nariki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 13:14
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/09; F02P9/00; F02P9/002; F02P3/005; F02P3/0876; F02P3/0884; F02P3/0892; F02P3/093; F02P3/096
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
219 words
An ignition system for an internal combustion engine, comprising: a first series closed-loop circuit including a DC power supply (1), an energy storage coil (3) and a first switching device (6); a second series closed-loop circuit including the energy storage coil (3), a diode (9), the primary winding (10a) of an ignition coil (10) and a second switching device (11); a capacitor (13) connected to the energy storage coil (3) through the diode (9); and switching device control means (4, 5, 8) for turning on a selected one of the first and second switching devices (6, 11) to store energy in the energy storage coil (3), the turned-on switching device (6, 11) being subsequently turned off to charge the capacitor (13) by the energy stored in the energy storage coil (3), the first switching device (6) being turned on to store energy in the energy storage coil (3) from the DC power supply (1) after the charging of the capacitor (13), the second switching device (11) being subsequently turned on substantially at the same time as the turning off of the first switching device (6) at an ignition timing thereby to supply the primary winding (10a) of the ignition coil (10) with the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 2
Dependent Claim
219 words
An ignition system for an internal combustion engine, comprising: a first series closed-loop circuit including a DC power supply (1), an energy storage coil (3) and a first switching device (6); a second series closed-loop circuit including the energy storage coil (3), a diode (9), the primary winding (10a) of an ignition coil (10) and a second switching device (11); a capacitor (13) connected to the energy storage coil (3) through the diode (9); and switching device control means (4, 5, 8) for turning on a selected one of the first and second switching devices (6, 11) to store energy in the energy storage coil (3), the turned-on switching device (6, 11) being subsequently turned off to charge the capacitor (13) by the energy stored in the energy storage coil (3), the first switching device (6) being turned on to store energy in the energy storage coil (3) from the DC power supply (1) after the charging of the capacitor (13), the second switching device (11) being subsequently turned on substantially at the same time as the turning off of the first switching device (6) at an ignition timing thereby to supply the primary winding (10a) of the ignition coil (10) with the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 3
Dependent Claim
31 words
An ignition system according to Claim 1, wherein said ignition coil (10) is a closed magnetic loop coil in which an air gap is intentionally eliminated from the closed magnetic loop.
Claim 4
Dependent Claim
53 words
An ignition system according to Claim 1, wherein a single energy storage coil (3), a single first switching device (6) and a single capacitor (13) are shared by a plurality of cylinders, and each of the ignition coils (10) and each of the second switching devices (11) correspond to each of the cylinders.
Claim 5
Dependent Claim
137 words
An ignition system according to Claim 1, wherein said switching control means includes first control signal generation means (4, 5) for turning on the first switching device (6) a predetermined time before an ignition timing and generating a first control signal for turning off the first switching device (6) at the ignition timing, second control signal generation means (8b) for turning on the second switching device (11a) from an ignition timing and generating a second control signal for turning off the second switching device (11a) a predetermined time after the ignition timing, and third control signal generation means (50a) for turning on the first switching device (6) again substantially simultaneously with the turning off of the second switching device (11a) and generating a third control signal for turning off the first switching device (6) a predetermined thereafter.
Claim 6
Dependent Claim
62 words
An ignition system according to Claim 4, wherein said first control signal generation means (4, 5) includes constant-current control means (4) for detecting the current flowing in the first switching device (6) and limiting the current in the first switching device (6) when the current exceeds a predetermined value and a sufficient magnetic energy is stored in the energy storage coil (3).
Claim 7
Dependent Claim
32 words
An ignition system according to Claim 4, wherein the time width of the second control signal generated in said second control signal generation means (8b) varies in accordance with the engine speed.
Claim 8
Dependent Claim
62 words
An ignition system according to Claim 4, wherein said third control signal generation means (50a) includes means (17) for detecting the current flowing in the first switching device (6) and extinguishing the third control signal when the current flowing in the first switching device (6) exceeds a predetermined value and a sufficient magnetic energy is stored in the energy storage coil (3).
Claim 9
Dependent Claim
65 words
An ignition system according to Claim 4, wherein said third control signal generation means (50a) includes means (107, 108) for extinguishing the third control signal forcibly when the first control signal for the next ignition cycle is generated in the first control signal generation means (4, 5) at the time of generation of the third control signal from the third control signal generation means (50a).
Claim 10
Dependent Claim
35 words
An ignition system according to Claim 4, wherein said capacitor (3) is connected in parallel to a series circuit including the primary winding (10a) of the ignition coil (10) and the second switching device (11a).
Claim 11
Dependent Claim
34 words
An ignition system according to Claim 4, further comprising a diode (24) for extending the arc time connected across the primary winding (10a) of the ignition coil (10) through the second switching device (11a).
Claim 12
Dependent Claim
42 words
An ignition system according to Claim 1, wherein the time of turning on the second switching device (11a) is slightly advanced from the time of turning off the first switching device (6) at an ignition timing by the switching device control means.
Claim 13
Dependent Claim
37 words
An ignition system according to Claim 4, wherein the switching device control means includes means (70) for preventing the generation of the first control signal until the charge voltage of the capacitor (13) exceeds a predetermined value.
Claim 14
Dependent Claim
51 words
An ignition system according to Claim 1, wherein the second switching device includes a field effect transistor (11a) and the switching device control means includes a power circuit (45) for supplying a gate voltage to the field effect transistor (11a) with the charges in the capacitor (13) as a power supply.
Claim 15
Dependent Claim
235 words
An ignition system for the internal combustion engine comprising: a first series closed circuit including a DC power supply (1), an energy storage coil (3) and a first switching device (6); a second series closed circuit including the energy storage coil (3), a first diode (9), the primary winding (10a) of an ignition coil (10) and a second switching device (11); a series circuit including a second diode (12) and a capacitor (13) in parallel to the second switching device (11); a third series closed circuit including the primary winding (10a) of the ignition coil (10), the second switching device (11), the capacitor (13) and a third diode (14); and switching device control means (4, 5, 8) for charging the capacitor (13) from the series circuit including the energy storage coil (3) and the primary winding (10a) of the ignition coil (10) at the time of turning off the second switching device (11), the first switching device (11) being turned on to store energy in the energy storage coil (3) from the DC power supply (1) after charging of the capacitor (13), the second switching device (11) being turned on substantially at the same time as the first switching device (6) at a subsequent ignition timing, thereby supplying the primary winding (10a) of the ignition coil (10) with the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 16
Dependent Claim
235 words
An ignition system for the internal combustion engine comprising: a first series closed circuit including a DC power supply (1), an energy storage coil (3) and a first switching device (6); a second series closed circuit including the energy storage coil (3), a first diode (9), the primary winding (10a) of an ignition coil (10) and a second switching device (11); a series circuit including a second diode (12) and a capacitor (13) in parallel to the second switching device (11); a third series closed circuit including the primary winding (10a) of the ignition coil (10), the second switching device (11), the capacitor (13) and a third diode (14); and switching device control means (4, 5, 8) for charging the capacitor (13) from the series circuit including the energy storage coil (3) and the primary winding (10a) of the ignition coil (10) at the time of turning off the second switching device (11), the first switching device (11) being turned on to store energy in the energy storage coil (3) from the DC power supply (1) after charging of the capacitor (13), the second switching device (11) being turned on substantially at the same time as the first switching device (6) at a subsequent ignition timing, thereby supplying the primary winding (10a) of the ignition coil (10) with the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 17
Dependent Claim
68 words
An ignition system according to Claim 14, wherein a single energy storage coil (3), a single first switching device (6) and a single capacitor (13) are shared by a plurality of cylinders, and a plurality of ignition coils (10a), a plurality of first switching devices (6) and a plurality of second switching devices (11) correspond to a plurality of second diodes (12) and a plurality of cylinders respectively.
Claim 18
Dependent Claim
92 words
An ignition system according to Claim 14, wherein said switching device control means includes first control signal generation means (4, 5) for generating a first control signal for turning off the first switching device (6) at an ignition timing after energization of the first switching device (6) a predetermined time before the ignition timing, and second control signal generation means (8) for generating a second control signal for turning off the second switching device (11) a predetermined time after the turning on of the second switching device (6) from an ignition timing.
Claim 19
Dependent Claim
28 words
An ignition system according to Claim 16, wherein said second control signal generation means includes monostable means (8) for generating a monostable output of a predetermined time width.
Claim 20
Dependent Claim
65 words
An ignition system according to Claim 16, wherein said second control signal generation means includes turn-off control means (50) for detecting the current flowing in the second switching device (11) and turning off the second switching device (11) when the current flowing in the second switching device (11) exceeds a predetermined value and a sufficient magnetic energy is stored in the energy storage coil (3).
Claim 21
Dependent Claim
81 words
An ignition system according to Claim 18, wherein said second control signal generation means includes means (8, 16, 23) for substantially invalidating the operation of the turn-off control means (50) during the period from the turning on of the second switching device (11) while a current more than a predetermined value is flowing in the primary winding (10a) of the ignition coil (10) by the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 22
Dependent Claim
61 words
An ignition system according to Claim 19, wherein said second control signal generation means includes means (8a) for turning off the second switching device (11a) in the case where the current flowing in the second switching device (11a) fails to reach a predetermined value after the lapse of a predetermined time from the turning on of the second switching device (11a).
Claim 23
Dependent Claim
74 words
An ignition system according to Claim 18, wherein said second control signal generation means includes means (90) for turning off the second switching device (11) while a sufficient energy remains in the energy storage coil (3) when the energy charged in the capacitor (13) is supplied to the primary winding (10a) of the ignition coil (10) after the turning on of the second switching device (11) with the engine speed exceeding a predetermined level.
Claim 24
Dependent Claim
56 words
An ignition system according to Claim 7, wherein said third control signal generation means (8b) includes means (112) extinguishing the third control signal when the current flowing in the first switching device (6) fails to reach a predetermined value after the lapse of a predetermined time from the turning on of the first switching device (6).
Claim 25
Dependent Claim
36 words
An ignition system according to Claim 16, wherein said switching device control means includes means (70) for preventing the generation of the first control signal before the voltage across the capacitor (13) exceeds a predetermined value.
Claim 26
Dependent Claim
100 words
A high-energy ignition system comprising an ignition coil (10) for generating a high ignition voltage across its secondary winding when a current is supplied to the primary winding thereof, a capacitor (13), means (100) for charging the capacitor (13), an energy storage coil (3), energy storage means (6) for supplying a current to the energy storage coil (3) to store energy therein, and energy supply means (11) for supplying a single primary winding of the ignition coil at a predetermined timing with both the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 27
Dependent Claim
100 words
A high-energy ignition system comprising an ignition coil (10) for generating a high ignition voltage across its secondary winding when a current is supplied to the primary winding thereof, a capacitor (13), means (100) for charging the capacitor (13), an energy storage coil (3), energy storage means (6) for supplying a current to the energy storage coil (3) to store energy therein, and energy supply means (11) for supplying a single primary winding of the ignition coil at a predetermined timing with both the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13).
Claim 28
Dependent Claim
123 words
A high-energy ignition system comprising an ignition coil (10) for generating a high ignition voltage in its secondary when a current is supplied to its primary, a capacitor (13), an energy storage coil (3), energy storage means (4, 5, 6) for supplying the energy storage coil (3) with a current periodically to store energy therein periodically, capacitor charging means (50a) for supplying the charging the capacitor (13) with the energy stored in the energy storage coil at a first timing, and energy supply means (11a) for supplying the primary (10a) of the ignition coil (10) with both the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13) at a second timing retarded from the first timing.
Claim 29
Dependent Claim
123 words
A high-energy ignition system comprising an ignition coil (10) for generating a high ignition voltage in its secondary when a current is supplied to its primary, a capacitor (13), an energy storage coil (3), energy storage means (4, 5, 6) for supplying the energy storage coil (3) with a current periodically to store energy therein periodically, capacitor charging means (50a) for supplying the charging the capacitor (13) with the energy stored in the energy storage coil at a first timing, and energy supply means (11a) for supplying the primary (10a) of the ignition coil (10) with both the energy stored in the energy storage coil (3) and the energy charged in the capacitor (13) at a second timing retarded from the first timing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.