GB2149849A - Ignition system for an internal combustion engine - Google Patents
Ignition system for an internal combustion engine Download PDFInfo
- Publication number
- GB2149849A GB2149849A GB08426321A GB8426321A GB2149849A GB 2149849 A GB2149849 A GB 2149849A GB 08426321 A GB08426321 A GB 08426321A GB 8426321 A GB8426321 A GB 8426321A GB 2149849 A GB2149849 A GB 2149849A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ignition system
- threshold value
- value switch
- signal generator
- internal combustion
- 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.)
- Withdrawn
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
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/155—Analogue data processing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (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 comprises an inductive signal generator 22 and a threshold valve switch 14 connected to the output of the signal generator. A capacitor 24 is connected in the feedback branch of the switch, thereby ensuring that the rotational position of the crankshaft at which the switch is operated remains constant as the engine speed changes. <IMAGE>
Description
SPECIFICATION
Ignition system for an internal combustion engine
The invention relates to an ignition system for an internal combustion engine, which is controllable by an inductive signal generator and a threshold value switch connected to the output of the generator, the ignition system having means for compensating for self-adjustment of the switching threshold of the threshold value switch.
An ignition system of this kind is already known (in accordance with German Offenlegungsschrift No. 32 08 262). However, the circuitry of the means for compensating for self-adjustment is relatively espensive. Here, the term "self-adjustment" of the switching threshold of the threshold value switch is to be understood to mean that, with reference to a specific threshold value of the threshold value switch, the portion of the angle of rotation through which the crankshaft of the internal combustion engine rotates between a fixed angular mark and the instant at which the threshold value switch is switched on, varies with the engine speed. Consequently, the storage of the ignition energy and the correct triggering of the ignition operation (instant of ignition) are sometimes impaired.
It is an object of the present invention to compensate for self-adjustment in a relatively simple manner.
In accordance with the present invention there is provided an ignition system for an internal combustion engine, which is controllable by an inductive signal generator and a threshold value switch connected to the output of the signal generator, said ignition system having means for compensating for selfadjustment of the switching threshold of the threshold value switch, wherein the threshold value switch has a feedback branch which incorporates a capacitive component.
Advantageously, in addition to shifting the switching threshold of the threshold value switch as the engine speed changes for the correct triggering of the ignition operation, interference pulses are also suppressed.
The invention will be described further hereinafter, by way of example only, with reference to the accompanying drawing, which is a circuit diagram of one embodiment of an ignition system in accordance with the invention.
The ignition system illustrated in the drawing is intended for an internal combustion engine (not illustrated) of a motor vehicle (also not illustrated). The ignition system is fed from a source of direct current 1 which may be the battery of the motor vehicle. A lead 2 is connected between the negative pole of the current source 1 and earth, and a supply lead incorporating an operating switch (ignition switch) 3 is connected to the positive pole of the current source 1. The supply lead 4 is the starting point for a circuit branch which leads first by way of the primary winding 5 of an ignition coil 6 and then to the earth lead 2 by way of an electronic circuit breaker 7. The electronic circuit breaker 7 is formed by the emitter-collector path of an n-p-n output transistor 8 whose emitter is connected to the earth lead 2.One end of the secondary winding 9 of the ignition coil 6 is connected to the connection between the primary winding 5 and the electronic circuit breaker 7, and the other end of the secondary winding is connected to the earth lead 2 by way of at least one spark plug 1 0.
The base of the output transistor 8 is connected to the collector of an n-p-n driver transistor 11, and to the supply lead 4 by way of a resistor 1 2. The emitter of the driver transistor 11 is connected to the earth lead 2, and its base is connected to the output 1 3 of a threshold value switch 14. The threshold value switch 1 4 operates in the manner of a
Schmitt trigger and is preferably in the form of an operational amplifier 1 5. The operational amplifier 1 5 is fed with its supply voltage by way of leads 16, 1 7. The inverting input (-) of the operational amplifier 1 5 is connected to a reference voltage Ub which is tapped from the common junction 1 8 of two resistors 19, 20.The two resistors 19, 20 thereby form a voltage divider connected between the supply lead 4 and the earth lead 2.
The non-inverting input (+) of the operational amplifier 1 5 is connected to the earth lead 2 by way of a resistor 21 and a signal generator 22 operating in the manner of an alternating current generator.
A feedback branch 23 is connected at one end to the non-inverting input (+) of the operational amplifier 1 5, and at the other end the output 1 3 of the operational amplifier 1 5.
The feedback branch 23 has a capacitive component 24.
In the preferred case, at least one ohmic resistor 25, and a series combination comprising at least one ohmic resistor 26 and a capacitor 27, are connected in parallel in the feedback branch 23.
A decoupling resistor is designated 28.
The mode of operation of the above-described ignition system is as follows:
The system is ready for operation as soon as the operating switch 3 is closed. It is now assumed that the control signal made available by signal generator 22 has reached the lower switching threshold of the threshold value switch 1 4 formed by the operational amplifier 1 5, and has switched off the threshold value switch. The output 1 3 should then assume substantially the potential of the earth lead 2 and put the emitter-collector path of the driver transistor 11 into its non-conductive state. Consequently, an electronic circuit breaker 7 formed by the emitter-collector path of the output transistor 8 becomes conductive and allows current to flow through the primary winding 5 of the ignition coil 6.Energy for the next ignition operation is now stored in the ignition coil 6. After the control signal supplied by the signal generator 22 has exceeded its negative peak value, the switchingon threshold of the threshold value switch 1 4 is finally reached upon the following positive half-wave. The output 1 3 again assumes substantially the potential of the supply lead 4 when the theshold value switch 14 is switched on, whereupon the emitter-collector path of the driver transistor 11 becoms conductive, and the electronic circuit breaker 7 formed by the emitter-collector path of the output transistor 8 becomes non-conductive, so that the current flowing through the primary winding 5 is interrupted and a highvoltage pulse is then induced in the secondary winding 9 and causes an electrical spark-over (ignition spark) at the spark plug 10.
The value of the resistors 19, 20 is of considerable importance for the position of the switching thresholds, and the ratio of the values of the feedback resistor 25 and of the resistor 21 is of considerable importance for the static switching hysteresis. The series combination comprising the resistor 26 and the capacitor 27 causes the switching threshold of the threshold value switch to shift as the engine speed changes and thus ensures, by way of the dynamic feedback, that the range of angular rotation, covered by the crankshaft of the internal combustion engine between a fixed angular mark and the switching-on of the threshold switch 14, remains substantially constant when the engine speed changes. At the same time, increased immunity to interference during control of the ignition system is achieved by using the series combination comprising the resistor 26 and the capacitor 27.
Claims (4)
1. An ignition system for an internal combustion engine, which is controllable by an inductive signal generator and a threshold value switch connected to the output of the signal generator, said ignition system having means for compensating for self-adjustment of the switching threshold of the threshold value switch, wherein the threshold value switch has a feedback branch which incorporates a capacitive component.
2. An ignition system as claimed in claim 1, wherein at least one ohmic resistor, and a series combination comprising at least an ohmic resistor and a capacitor are connected in parallel in the feedback branch.
3. An ignition system as claimed in claim 1 and 2, wherein the threshold value switch is an operational amplifier whose inverting input is connected to a fixed reference voltage, and whose non-inverting input receives control signals from the signal generator, and in which the feedback branch is connected at one end to the non-inverting input and at the other end to the output.
4. An ignition system for an internal combustion engine, constructed and adapted to operate substantially as herein described, with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833341014 DE3341014A1 (en) | 1983-11-12 | 1983-11-12 | IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8426321D0 GB8426321D0 (en) | 1984-11-21 |
| GB2149849A true GB2149849A (en) | 1985-06-19 |
Family
ID=6214192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08426321A Withdrawn GB2149849A (en) | 1983-11-12 | 1984-10-18 | Ignition system for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS60116860A (en) |
| DE (1) | DE3341014A1 (en) |
| GB (1) | GB2149849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4617905A (en) * | 1984-03-28 | 1986-10-21 | Lucas Electrical Electronics and Systems Ltd. | Electronic ignition system for an internal combustion engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2099079A (en) * | 1981-05-27 | 1982-12-01 | Nippon Denso Co | Spark timing control apparatus for an internal combustion engine |
-
1983
- 1983-11-12 DE DE19833341014 patent/DE3341014A1/en not_active Withdrawn
-
1984
- 1984-10-18 GB GB08426321A patent/GB2149849A/en not_active Withdrawn
- 1984-11-07 JP JP59233417A patent/JPS60116860A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2099079A (en) * | 1981-05-27 | 1982-12-01 | Nippon Denso Co | Spark timing control apparatus for an internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4617905A (en) * | 1984-03-28 | 1986-10-21 | Lucas Electrical Electronics and Systems Ltd. | Electronic ignition system for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3341014A1 (en) | 1985-05-30 |
| GB8426321D0 (en) | 1984-11-21 |
| JPS60116860A (en) | 1985-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |