GB2064645A - Ignition System for an Internal Combustion Engine - Google Patents
Ignition System for an Internal Combustion Engine Download PDFInfo
- Publication number
- GB2064645A GB2064645A GB8038742A GB8038742A GB2064645A GB 2064645 A GB2064645 A GB 2064645A GB 8038742 A GB8038742 A GB 8038742A GB 8038742 A GB8038742 A GB 8038742A GB 2064645 A GB2064645 A GB 2064645A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switching transistor
- emitter
- ignition system
- primary winding
- voltage
- 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
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
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
- F02P3/051—Opening or closing the primary coil circuit with semiconductor devices
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 ignition system has a primary winding (2) of an ignition coil (1) forming a series circuit with the emitter-collector path of a switching transistor (7). A comparator (9) regulates the current flowing via the primary winding (2) by comparing at least a proportion of the voltage across the emitter-collector path of the switching transistor (7) with at least a proportion of the voltage across the base-emitter path of the switching transistor (7). <IMAGE>
Description
SPECIFICATION
Ignition System for an Internal Combustion
Engine
The invention relates to an ignition system for an internal combustion engine, comprising a primary winding of an ignition coil, a switching transistor whose emitter-collector path forms, together with the primary winding, a series circuit, and a measuring device for the current carried by the primary winding.
From German Patent No. 2549586 an ignition system of this type is already known, in which the measuring device is formed by a measuring resistor connected in series with the primary winding, and in which the voltage drop across this resistor forms the measured quantity. For this purpose, a relatively high-load resistor, involving substantial cost, is necessary. In addition, fairly substantial dissipation occurs in the measuring resistor.
There is provided by the present invention an ignition system for an internal combustion engine, comprising a primary winding of an ignition coil, a switching transistor whose emitter-collector path forms, together with the primary winding, a series circuit and a measuring device for the current carried by the primary winding, wherein the measuring device comprises a differential amplifier, by means of which at least a proportion of the voltage across the emitter-collector path of the switching transistor is compared with at least a proportion of the voltage across the baseemitter path of the switching transistor.
In the ignition system according to the present invention the above-mentioned defect of the prior system is avoided.
An embodiment of the invention is shown in the accompanying drawing and is further elucidated in the description hereinafter. The sole
Figure of the drawing is a circuit diagram of the ignition system of the embodiment.
The drawing shows an ignition coil 1, comprising a primary winding 2 and a secondary winding 3, of an ignition system of the internal combustion engine of a motor vehicle (not shown). One end of the primary winding 2 is connected to a terminal 4, which is connectible, for example, by means of an operating switch i.e.
an ignition switch (not shown) to the positive terminal of a direct-current source (not shown) such as the battery of the motor vehicle. The other end of the primary winding 2 is the point of origin of two branch circuits, one circuit leading via the secondary winding 3 and then via a sparking plug 5 to the earth connection 6, which is connected to the negative terminal of the direct-current source, and the other branch circuit leading to the collector of an npn switching transistor 7, and then from the emitter of the switching transistor 7 to the earth connection 6.
The emitter-collector path of the switching transistor 7 can be rendered conducting by means of a positive control pulse tl via a control line 8 connected to the base of this transistor 7, and can be rendered non-conducting by a negative control pulse t2.
The circuit arrangement shown includes a differential amplifier 9 as the measuring device for measuring the current flow via the primary winding 2, at least a proportion of the voltage across the emitter-collector path of the switching transistor 7 being compared by this differential amplifier 9 with at least a proportion of the voltage across the base-emitter path of the switching transistor 7. An operationai amplifier 10, whose non-inverting input 11 is connected by means of a resistor 12 to the collector of the switching transistor 7, and whose inverting input 1 3 is connected by means of a resistor 14 to the control line 8, is preferably used as the differential amplifier 9. The inverting input 13 is connected to the earth connection 6 by way of a resistor 15, which is preferably a variable resistor.The noninverting input 11 is also connected by way of a
Zener diode 1 6 to the earth connection 6, the cathode of the Zener diode 1 6 in this case being connected to the non-inverting input 11.
A resistor 1 9 connected to the differential amplifier 9 between the inverting input 13 and the output 1 7 serves as a feedback resistor and is preferably of the variable type. Furthermore, it is advantageous to connect the inverting input 13 to a constant-voltage source 20, and, by means of a resistor 21, to the terminal 4.
Lastly, in the selected embodiment the output 17 of the differential amplifier 9 is connected via a resistor 22 to the base of an npn currentlimiting transistor 18, whose collector is connected to the control line 8, and whose emitter is connected to the earth connection 6.
The resistors 23 and 24 are proportioning resistors.
The method of operation of the abovedescribed circuit arrangement is as follows:- It is assumed that the terminal 4 is connected to the positive terminal of the direct-current source and that the system is therefore ready for operation. When the control pulse t1 occurs, the emitter-collector path of the switching transistor 7 is rendered conducting. Current then commences to flow in the primary winding 2 and increases exponentially. In dependence on this current rise, the potential at the collector of the switching transistor 7, the output 1 7 of the differential amplifier 9, and the base of the current-limiting transistor 1 8 also increases.
Owing to this regulating action the current flowing via the primary winding 2 ultimately builds up to a predetermined value at which the energy necessary to provide an effective ignition spark is stored in the ignition coil 1. Since the control voltage of the differential amplifier 9 is formed by the difference between a proportion of the voltage across the emitter-collector path of the switching transistor 7 and a proportion of the voltage across the zaee3emitter path of the switching transistor, it is possible, by means of the resistors 1 5 and 19, to determine the primarycurrent limit value independently of temperature.
The constant-current source 20 provides a further means of control. By the use of the resistor 21 the primary-current limit value can be made independent of fluctuations in the operating voltage.
If, at the ignition instant, the emitter-collector path of the switching transistor 7 is then blocked by the control pulse t2 and the current flow via the primary winding 2 is thereby interrupted, a high-voltage surge occurs in the secondary winding 3, which causes an electrical spark discharge (an ignition spark) across the sparking plug 5. The Zener diode 16 ensures that generation of the ignition voltage has no harmful effect upon the differential amplifier 9.
The signal voltage at the outout 1 7 of the differential amplifier 9 may also be used, of course, for other controlling or regulating functions in the ignition system. In this respect, it is also quite possible to use the differential amplifier 9 for the generation of digital signals, by incorporating it, for example, in the circuit of a comparator as a threshold-value switch for limitation of the current in the primary winding 2.
Claims (6)
1. An ignition system for an internal combustion engine, comprising a primary winding of an ignition coil, a switching transistor whose emitter-collector path forms, together with the primary winding, a series circuit, and a measuring device for the current carried by the primary winding, wherein the measuring device comprises a differential amplifier by means of which at least a proportion of the voltage across the emittercollector path of the switching transistor is compared with at least a proportion of the voltage across the base-emitter path of the switching transistor.
2. An ignition system according to claim 1, wherein the differential amplifier is formed by an operation amplifier whose non-inverting input is connected to the collector of the switching transistor and whose inverting input is connected to a control circuit connected to the base of the switching transistor.
3. An ignition system according to claim 2, wherein the non-inverting input is connected by way of a Zener diode to the emitter of the switching transistor the anode of the Zener diode being connected to the emitter.
4. An ignition system according to claim 2 or 3, wherein the inverting input 5 connected by means of a resistor to the emitter of the switching transistor.
5. An ignition system according to claim 4, wherein said resistor connected to the emitter of the switching transistor is variable.
6. An ignition system for an internal combustion engine substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792948645 DE2948645A1 (en) | 1979-12-04 | 1979-12-04 | IGNITION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2064645A true GB2064645A (en) | 1981-06-17 |
| GB2064645B GB2064645B (en) | 1983-07-06 |
Family
ID=6087516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8038742A Expired GB2064645B (en) | 1979-12-04 | 1980-12-03 | Ignition system for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2948645A1 (en) |
| FR (1) | FR2470872A1 (en) |
| GB (1) | GB2064645B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138644A (en) * | 1983-04-22 | 1984-10-24 | Lumenition Ltd | Power Transistor Protection |
| FR2586062A1 (en) * | 1985-08-06 | 1987-02-13 | Bosch Gmbh Robert | METHOD FOR STABILIZING THE FINAL CURRENT VALUE IN THE PRIMARY WINDING OF AN IGNITION COIL EQUIPPED WITH AN INTERNAL COMBUSTION ENGINE |
| EP0447975A1 (en) * | 1990-03-19 | 1991-09-25 | MARELLI AUTRONICA S.p.A. | An ignition system for an internal combustion engine |
| US5146907A (en) * | 1990-10-12 | 1992-09-15 | Mitsubishi Denki Kabushiki Kaisha | Ignition apparatus having a current limiting function for an internal combustion engine |
| EP0672827A1 (en) * | 1994-03-18 | 1995-09-20 | Siemens Aktiengesellschaft | Method and device for monitoring the ignition system of a combustion engine |
| EP0935290A2 (en) * | 1998-02-09 | 1999-08-11 | Motorola, Inc. | Power semiconductor device and method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3041525A1 (en) * | 1980-11-04 | 1982-06-16 | Robert Bosch Gmbh, 7000 Stuttgart | IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES |
| DE3051217C2 (en) * | 1980-11-04 | 1993-04-08 | Robert Bosch Gmbh, 7000 Stuttgart, De | IC engine electronic ignition circuit |
| DE3839039A1 (en) * | 1988-11-18 | 1990-05-23 | Bosch Gmbh Robert | IGNITION STAGE OF A TRANSISTOR IGNITION SYSTEM |
| DE102008000871B4 (en) * | 2008-03-28 | 2021-07-01 | Robert Bosch Gmbh | Circuit arrangement for switching the flow of current through an ignition coil |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51106838A (en) * | 1975-03-14 | 1976-09-22 | Nippon Denso Co | |
| JPS51114534A (en) * | 1975-04-02 | 1976-10-08 | Hitachi Ltd | Contactless ignition device |
-
1979
- 1979-12-04 DE DE19792948645 patent/DE2948645A1/en not_active Withdrawn
-
1980
- 1980-11-12 FR FR8024059A patent/FR2470872A1/en active Granted
- 1980-12-03 GB GB8038742A patent/GB2064645B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138644A (en) * | 1983-04-22 | 1984-10-24 | Lumenition Ltd | Power Transistor Protection |
| FR2586062A1 (en) * | 1985-08-06 | 1987-02-13 | Bosch Gmbh Robert | METHOD FOR STABILIZING THE FINAL CURRENT VALUE IN THE PRIMARY WINDING OF AN IGNITION COIL EQUIPPED WITH AN INTERNAL COMBUSTION ENGINE |
| EP0447975A1 (en) * | 1990-03-19 | 1991-09-25 | MARELLI AUTRONICA S.p.A. | An ignition system for an internal combustion engine |
| US5146907A (en) * | 1990-10-12 | 1992-09-15 | Mitsubishi Denki Kabushiki Kaisha | Ignition apparatus having a current limiting function for an internal combustion engine |
| EP0672827A1 (en) * | 1994-03-18 | 1995-09-20 | Siemens Aktiengesellschaft | Method and device for monitoring the ignition system of a combustion engine |
| US5631564A (en) * | 1994-03-18 | 1997-05-20 | Siemens Aktiengesellschaft | Method and apparatus for monitoring the ignition device of an internal combustion engine |
| EP0935290A2 (en) * | 1998-02-09 | 1999-08-11 | Motorola, Inc. | Power semiconductor device and method |
| EP0935290A3 (en) * | 1998-02-09 | 2000-12-06 | Motorola, Inc. | Power semiconductor device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2064645B (en) | 1983-07-06 |
| DE2948645A1 (en) | 1981-06-11 |
| FR2470872B1 (en) | 1984-03-16 |
| FR2470872A1 (en) | 1981-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |