GB2027123A - Capacitive discharge ignition system - Google Patents
Capacitive discharge ignition system Download PDFInfo
- Publication number
- GB2027123A GB2027123A GB7918943A GB7918943A GB2027123A GB 2027123 A GB2027123 A GB 2027123A GB 7918943 A GB7918943 A GB 7918943A GB 7918943 A GB7918943 A GB 7918943A GB 2027123 A GB2027123 A GB 2027123A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ignition system
- primary winding
- transformer
- capacitor
- alternating current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 35
- 238000009434 installation Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
- F02P1/08—Layout of circuits
- F02P1/086—Layout of circuits for generating sparks by discharging a capacitor into a coil circuit
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The capacitor 11 of a capacitive discharge ignition system for a stationary internal combustion engine is charged via a half-wave rectifier unit 2 from an alternating current supply, which may be a three-phase supply. A resistor 4 limits the charge current. <IMAGE>
Description
SPECIFICATION
Capacitive discharge ignition system
The present invention relates to a capacitive discharge ignition system for internal combustion engines, particularly engines intended for fixed installations.
Until now, internal combustion engines in fixed installations have used electromechanical or electronic ignition systems powered by an accumulator battery source. The battery requires continuous and expensive maintenance and furthermore may have a considerable size and occupy a large amount of space.
In view of the often very difficult operating conditions in which such fixed installations have
to function, it is desirable to have an electronic
ignition system for engines in fixed installations to
ensure reliable starting, but an electronic ignition system normally requires, as indicated above, a
direct current supply with the disadvantages
already referred to.
The object of the present invention is to provide
an electronic ignition system which can be
powered by an alternating current supply,
preferably an industrial three-phase alternating
current supply, and which does not therefore
require a battery. A further object is to provide
such a system which may be easily constructed
and is inexpensive.
According to the present invention there is
provided a capacitive discharge ignition system for
an internal combustion engine intended for fixed
installations, characterised in that the system
includes half-wave rectifier means for connection
to an alternating current supply, means
connecting the output of the rectifier means to a
capacitor and to the primary winding of a
transformer, a solid state controlled switching
element connected in series with the said primary
winding and having a control electrode connected
to an electromagnetic pick-up device cooperating
with a rotor which in use of the system if driven by
the engine, so that a spark ignition voltage is produced at the secondary winding or winding of
the transformer by the discharge of the capacitor
through the transformer primary winding caused
by conduction of the switching element each time
a signal is detected by the pick-up device.
The ignition system of the present invention is
of simple and inexpensive construction and does
not require an expensive and cumbersome battery.
The invention will be further described, by way
of non-limiting example, with reference to the
accompanying drawing, which is a schematic
circuit diagram of an ignition system according to
one embodiment of the invention.
The accompanying Figure shows an ignition
system according to the invention having a half
wave rectifier unit 2 for connection to a three
phase alternating current supply.
The output of the rectifier unit 2 is
connected through a series resistance 4 to one
end of the primary winding 5 of a transformer 7.
The other end of the primary winding 5 is connected to the anode of a solid state switching element comprising a silicon-controlled rectifier or thyristor 8, the cathode of which is connected to the anode of a diode 10 and to earth. A capacitor 11 is connected in parallel with the primary winding 5 and the thyristor 8.
The control electrode of the thyristor 8 is
connected to the cathode of the diode 10. The
cathode and the anode of the diode 10 are
interconnected through a detector coil 12 of an
electromagnetic pick-up cooperating with a
phonic wheel or pulley 13 keyed to the engine
crankshaft (not shown) and having a small
activation tooth 14.
The secondary winding 15 of the transformer 7
is connected to the sparking plugs (not shown) of
the engine.
In operation of the circuit a three-phase
alternating current mains supply at 380 volts is
half-wave rectified by the rectifier unit 2 and
passes through the resistance 4 which serves to
limit the charging current of the capacitor 1 1.
The ignition timing is controlled by the
electromagnetic pick-up cooperating with the tooth 14 on the pulley 13. A substantially
sinusoidal voltage signal is induced in the detector
coil 12 each time the tooth 14 passes the coil 12.
The negative portion of this signal is removed by
the diode 10 and the positive portion results in
conduction of the thyristor 8, causing the
capacitor 11 to discharge through the transformer
primary winding 5 and inducing a high voltage
pulse in the secondary winding 1 5 sufficient to
cause firing of the sparking plugs.
The resistance 4 serves to limit the current
which flows in the transformer primary winding 5 when the thyristor 8 conducts.
1. A capacitive discharge ignition system for an
internal combustion engine intended for fixed
installations, comprising half-wave rectifier means
for connection to an alternating current supply,
means connecting the output of the recitifier
means to a capacitor and to the primary winding
of a transformer, a solid state controlled switching
element connected in series with the said primary
winding and having a control electrode connected
to an electromagnetic pick-up device cooperating
with a rotor which in use of the system is driven by
the engine, so that a spark ignition voltage is
produced at the secondary winding or windings of
the transformer by the discharge of the capacitor
through the transformer primary winding caused by conduction of the switching element each time
a signal is detected by the pick-up device.
2. An ignition system according to Claim 1, in
which the half-wave rectifier means are arranged
to provide half-wave rectified output from a
three-phase alternating current supply.
3. An ignition system according to Claim 1 or
Claim 2, in which the capacitor is earthed on its
side remote from the rectifier means.
4. An ignition system according to any one of
Claims 1 to 3, in which a diode is connected
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A capacitive discharge ignition system for an
internal combustion engine intended for fixed
installations, comprising half-wave rectifier means
for connection to an alternating current supply,
means connecting the output of the recitifier
means to a capacitor and to the primary winding
of a transformer, a solid state controlled switching
element connected in series with the said primary
winding and having a control electrode connected
to an electromagnetic pick-up device cooperating
with a rotor which in use of the system is driven by
the engine, so that a spark ignition voltage is
produced at the secondary winding or windings of
the transformer by the discharge of the capacitor
through the transformer primary winding caused by conduction of the switching element each time
a signal is detected by the pick-up device.
2. An ignition system according to Claim 1, in
which the half-wave rectifier means are arranged
to provide half-wave rectified output from a
three-phase alternating current supply.
3. An ignition system according to Claim 1 or
Claim 2, in which the capacitor is earthed on its
side remote from the rectifier means.
4. An ignition system according to any one of
Claims 1 to 3, in which a diode is connected across the output of the pick-up device to rectify partially the said output before its application to the control electrode of the switching element.
5. An ignition system according to any one of the preceding claims, in which the rectifier means are connected to the capacitor and the transformer primary winding through a currentlimiting resistance.
6. A capacitive discharge ignition system substantially as herein described with reference and as shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT68805/78A IT1160556B (en) | 1978-07-28 | 1978-07-28 | THREE-PHASE CAPACITIVE DISCHARGE IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES INTENDED FOR FIXED SYSTEMS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2027123A true GB2027123A (en) | 1980-02-13 |
| GB2027123B GB2027123B (en) | 1983-05-18 |
Family
ID=11310624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7918943A Expired GB2027123B (en) | 1978-07-28 | 1979-05-31 | Capacitive discharge ignition system |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5519984A (en) |
| BR (1) | BR7904608A (en) |
| DE (1) | DE2923998A1 (en) |
| FR (1) | FR2432098A1 (en) |
| GB (1) | GB2027123B (en) |
| IT (1) | IT1160556B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02250973A (en) * | 1989-03-25 | 1990-10-08 | Tokyo Electron Ltd | Film forming device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB984137A (en) * | 1961-10-06 | 1965-02-24 | Lucas Industries Ltd | Spark ignition apparatus |
| US3240198A (en) * | 1962-01-12 | 1966-03-15 | Bendix Corp | Electrical apparatus |
| US3466502A (en) * | 1967-03-13 | 1969-09-09 | Honeywell Inc | Controlled rectifier triggering circuit |
| DE1539181B2 (en) * | 1967-05-09 | 1976-07-29 | Robert Bosch Gmbh, 7000 Stuttgart | IGNITION DEVICE FOR COMBUSTION MACHINERY |
| US3498281A (en) * | 1968-08-23 | 1970-03-03 | Briggs & Stratton Corp | Small engine capacitor discharge ignition system |
| GB1256679A (en) * | 1969-08-05 | 1971-12-15 | ||
| JPS4712995U (en) * | 1971-03-09 | 1972-10-16 | ||
| JPS5028072Y2 (en) * | 1971-07-08 | 1975-08-19 | ||
| JPS5043686U (en) * | 1973-08-22 | 1975-05-02 |
-
1978
- 1978-07-28 IT IT68805/78A patent/IT1160556B/en active
-
1979
- 1979-05-31 GB GB7918943A patent/GB2027123B/en not_active Expired
- 1979-06-13 DE DE19792923998 patent/DE2923998A1/en not_active Ceased
- 1979-06-15 FR FR7915454A patent/FR2432098A1/en active Granted
- 1979-06-19 JP JP7640779A patent/JPS5519984A/en active Pending
- 1979-07-19 BR BR7904608A patent/BR7904608A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2923998A1 (en) | 1980-02-07 |
| IT1160556B (en) | 1987-03-11 |
| IT7868805A0 (en) | 1978-07-28 |
| BR7904608A (en) | 1980-04-15 |
| FR2432098A1 (en) | 1980-02-22 |
| JPS5519984A (en) | 1980-02-13 |
| FR2432098B1 (en) | 1984-03-23 |
| GB2027123B (en) | 1983-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19990530 |