Method and device for increasing spark energy in capacitive-discharge ignition systems

FIELD: engines and pumps.

SUBSTANCE: invention refers to method and device for spark energy increase, namely in small "capacitive-discharge ignition systems" without storage batteries intended for internal combustion engines in which striking voltage is created by means of generator and its control circuit, which are connected to handwheel or built into it. Spark energy increasing device includes at least one charging winding (L1), the first rectifier (D1), charging capacitor (C1), primary (L3) and secondary (L4) windings of voltage transformer, the second rectifier (D2) and switching element (Q2). Charging winding (L1) charges capacitor (C1) through the first rectifier (D1). Capacitor (C1) is connected to primary winding (L3). At low speed of engine the switching element (Q2) from time to time short-circuits charging winding (L1) in order to increase the charge of capacitor (C1). Device can contain control unit (M1). Unit (M1) controls switching element (Q2) so that level of charging voltage on charging capacitor (C1) is maintained relatively constant in the whole range of engine speed. Switching element (Q2) can be made so that short circuit can be created for the purpose of engine stop.

EFFECT: maintaining sufficient charge level of capacitor at lower rpm speed.

3 cl, 5 dwg

 

The technical FIELD

This invention relates to a method and apparatus for increasing spark energy, particularly in small, so-called "capacitive ignition (SEZ)without batteries intended for internal combustion engines in which the ignition voltage is generated using a generator and its control circuit, connected to the flywheel or built into it.

The invention can be implemented without having to modify the characteristics of the existing generator, such as, for example, the magnetic field, the parameters of the core and so the whole idea of the invention can be used to obtain a higher voltage, especially in small mobile systems of internal combustion engines.

BACKGROUND of the INVENTION

These method and apparatus have particular application in small mobile manually triggered device driven by an internal combustion engine, such as various kinds of devices such as chain saws, lawn mowers, outboard motors and the like. Conventional ignition systems inherent problems associated with getting spark energy, sufficient to ensure a fast and reliable start, especially at low speed, for example, when you run these devices.

In U.S. patent No. 6701896 described the method by which the duration is alnost spark duration can be increased, that gives increased energy. However, at low speed, this method provides only a small or even zero increase of energy.

BRIEF description of the INVENTION

The purpose of the invention is to significantly increase the available spark energy with a very economical schemes according to the concept of the invention. This is especially suitable for low speed, for example, when running, especially when compounded the problem associated with low energy sparks.

The method according to the invention enables the use of energy, which is known in traditional systems is just not taken into account. In normal cèze (see, for example, U.S. patent No. 6701896 and the description below) is the so-called "charging coil, which is at the core in the magnetic circuit and is activated once per revolution of the engine.

The voltage induced on this charging cable charges the capacitor through a rectifier once per revolution of the engine. Then the capacitor is cyclically discharged through the other winding located on the same or another core and represents the primary winding of the transformer and its secondary winding produces a voltage spark to the spark plugs.

The voltage on the charging winding depends mainly on the number of turns of the winding and momentum of the jet is. On the one hand it is desirable to have a large number of turns of the charging winding at low engine speeds in order to obtain an acceptable charge voltage, and on the other hand it would be desirable to have a smaller number of turns at high engine speeds so as not to expose the capacitor overload voltage.

The method and the device according to the invention make it possible, for example, optimization of the number of turns of the winding for charging high engine speed and at the same time maintaining a sufficient level of charge of the capacitor at lower rpm.

This is achieved by adding two relatively inexpensive components in a common scheme, namely one additional rectifier diode and one transistor, which can short out the charging winding. Due to the fact that the charging pulse charging winding at low engine speed has a relatively great length, by switching on and off of the specified transistor with a certain frequency can more effectively perform the charging of the capacitor when the regulation of additional energy so that the charging voltage on the capacitor does not exceed dangerous limits.

In the perspective of environmental considerations may require in the above small engine system EAP is ISCA fuel instead of a carburetor. This improves the control of the combustion process, that is, increases power, reduces fuel consumption, exhaust gases become less toxic, etc. One of the problems associated with the transition to the injection system, is that they require much more energy. As you know, during the compression stroke the fuel is fed under pressure into the cylinder. This is usually done by means of the injector electric powered, requiring considerable energy. Due to the fact that in mobile systems, based on weight, it is undesirable to have the battery to produce this energy should the generator associated with the flywheel. Regardless of the design of this generator, it must be optimized to supply large amounts of energy in the injection system at a much lower voltage than required for charging the charging capacitor cèze. By means of the method in accordance with the invention, it is possible to solve this problem, that is, when the low voltage winding will be able to generate a high voltage for charging the capacitor.

An additional advantage of the method and device in accordance with the invention is that it is possible to use the existing so-called green fuels (such as E85) with different additive and ethanol in the absence of such serious problems as in the case of a conventional ignition system. Starting a cold engine with some types of fuel ethanol requires a higher spark energy than running on pure gasoline, due to the fact that ethanol is worse evaporates and thus has a lower Flammability.

Another advantage of the invention lies in the fact that the additional transistor, which will be described in detail hereinafter, can be used to limit or completely disable charging function. This circumstance can be used for so-called "stop-and-click when logged a single button that is used to short circuit the charger winding through the transistor, and thus, the energy does not reach the charging of the capacitor, which causes a stop of the engine.

By means of the transistor can also adjust the voltage level of the charging capacitor. For example, the adjustment can be performed as follows: at low engine speeds for an additional transistor pulses according to the schedule 2 to increase the charging voltage; when the speed increases, approaching the value of approximately 5000-6000 rpm, you may experience the opposite problem, when the voltage on the charging capacitor reaches levels that can exceed the ü its rated voltage, and in this situation, the transistor can be used to short circuit part of the charging pulse, thereby limiting the charging voltage to an acceptable level.

This invention eliminates the above-mentioned technical problems of the known solutions is characterized in the following claims.

Description of the DRAWINGS

Further aims, scope and advantages of the invention will become apparent from the following description with reference to the accompanying drawings, on which:

Figure 1 schematically depicts an example implementation of the proposed method.

Figa and 2C depict the signals at the two measuring points of the traditional scheme.

Fig.2b and 2d depict the corresponding signals in the scheme made in accordance with the invention.

DESCRIPTION OPTIONS

1 schematically and in simplified form shows a schematic diagram of a typical cèze used for engines of small size, which has been modified in accordance with the invention. Steel core T1 with four standard spaced windings is magnetized by one or more magnets embedded in the flywheel that the rotation of the latter are integral parts of the core. Option with multiple magnets can be used to create a generally more is a powerful generator, who, besides working as a generator voltage ignition may be used for other purposes, for example, in fuel injection systems or for heated handle chain saws. Relative movement of the magnet produces a voltage on the windings L1-L4 as follows.

Winding L1 is a so-called charging coil, which generates a voltage used to create the actual spark discharge. One end 1 of the winding L1 is connected through a rectifying device D1 and D2 with the charging capacitor C1, in which the energy will build up until, until a spark discharge. The other end 2 is grounded.

The winding L2 is a so-called starting winding. This winding is connected between ground 7 and the input IN1 of the unit M1 control, and supplies the input information about the position and speed of the flywheel. It should be noted that the block M1 control represents only a slight modification to the conventional control unit.

Winding L3 represents a primary, a L4 - secondary winding of the transformer to generate the ignition voltage to the spark SP1 ignition.

Typically, the output OUT1 of the control unit M1 is activated when the spark plug should submit an ignition voltage. Switching element (thyristor) Q1, a control electrode which is connected to the output OUT, forms a grounding path that leads to the supply voltage from the capacitor C1 to the primary winding L3. In this case, the first transient voltage occurs in the secondary winding L4 due to the very high secondary voltage at test point TP2 on the anode of the thyristor. Immediately after this transformer L3/L4 enters the state of damped natural oscillations, in which the energy passes between the coil L3 and the capacitor C1 through the switching element Q1 and the rectifier D2 in the form of a shunt diode.

In addition, it can be assumed use for education sparks other as resonant and nonresonant diagrams are not beyond the scope of the invention.

The output OUT2 of the block M1 control, which is a modification of the conventional control unit, easily performed by specialists in the art, is connected with the control input of the transistor Q2, the main electrodes of which are connected between ground and the common point between the rectifying devices D1 and D2. Thus, the transistor Q2 when activated can connect the common point between the rectifying devices D1 and D2 to ground, thereby shorting the coil L1.

Thus, the output OUT2 of the control unit M1 receives such a signal during a half-period of induction voltage in the coil L1, which is charging the capacitor C1, periodically shorts the coil L1.

During these periods, when the transistor Q2 is "on", current flows in the circuit L1/Q2 due to the induction created by the magnet built into the flywheel. Followed by the "off" period Q2, when charging the capacitor C1. This method gives the opportunity to charge the capacitor C1 to a much higher voltage than is actually induced by the coil L1, especially at low revs, when the induction in the coil L1 is low, but a long time.

Elements necessary to implement the method in accordance with the invention in the usual cèze, are only additional rectifier/diode D3 and the transistor Q2, and the block M1 control, you must add the appropriate logic to control the output OUT2.

Specified additional logic is simple, can be easily realized by a person skilled in the field of technology and complicates the block M1 control very slightly.

The transistor Q2 does not necessarily have to be a field MOS transistor, as in this example, and the rectifying device D1/D3 need not be included in exact accordance with the concept: for example, D1 can be replaced with the full bridge rectifier circuit, without going beyond the limits of pre the proposed method.

On figa and 2b shows the voltage as a function of time in control points, respectively, TP1, 2, 3 in the diagram according to figure 1 when the engine is operating at 600 rpm On figa shows normal charging process, when using only one rectifying diode to charge, and fig.2b shows charging according to the proposed method. In addition, in the drawings shows the measured values obtained charging voltage, namely its increase from 136 to 194 C. Because the available energy is calculated by the formula: W=C×U2/2, in this example, the capacitance of the charging capacitor of 0.47 μf available energy increases from 4.3 mW·up to 8.8 mW ° C.

On figs and 2d shows the same dependence on figa and 2b, but with the speed 1200 rpm Performing the same calculation, when the voltage 214 and 256 To get increased power of 10.7 mW·up to 15.4 mW ° C. Thus, with increasing speed possible increase energy decreases rapidly. However, this fact is mitigated somewhat by the fact that the charging winding no longer need to optimize for the entire rpm range. In fact, the energy levels are possible at both high and low speeds of the engine.

1. Device for increasing spark energy systems capacitive ignition containing at least one charging coil (L1), via the first rectifier is a device (D1) charges the charging capacitor (C1), coupled with the primary winding of the transformer voltage ignition to ensure the specified winding energy for the formation of sparks, characterized in that it further includes a second rectifier (D2) and the switching element (Q2), is designed so that it can periodically shorting the charging winding and thereby increase the charge of the charging capacitor at low engine speeds.

2. The device according to claim 1, characterized in that the block (M1) control is executed to control switching element (Q2) depending on the engine speed so that the charging voltage at the charging capacitor (C1) is maintained relatively constant throughout the range of engine speed.

3. The device according to claim 1 or 2, characterized in that the switching element (Q2) is made with the possibility of creating a short circuit on the charging coil (L1) to stop engine.



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: invention concerns ignition systems of internal combustion engines with inductive and capacitive energy storage and can be used in ignition systems of internal combustion engines. Method of discharge voltage reduction in ignition systems of internal combustion engines with inductive and capacitive energy storage consists that spark discharge series is enabled before ignition point when the cylinder pressure is lower than it is at the ignition point, and discharge voltage is lower up to the values 8-10 times less during inlet stroke if the cylinder pressure does not exceed the atmospheric pressure. Spark discharge energy is sufficient for discharge gap breakdown. Due to residual ionisation, spark discharge repetition frequency supports the discharge gap breakdown. Breakdown voltage of the next discharge remains lower than maximum permissible for the used ignition system regardless of pressure increase. Spark discharge duration and energy are insufficient for blended fuel ignition. At the ignition point, spark discharge or discharges energy increases to the value sufficient for blended fuel ignition.

EFFECT: electric loss enhancement in ignition system, more reliable performance, improved engine efficiency and capacity.

1 cl, 7 dwg

Flywheel generator // 2360140

FIELD: motors and pumps.

SUBSTANCE: flywheel generator contains movable part represented as a flywheel with permanent magnets being provided with polar tips and immovable part represented as a base with power and control windings being installed on magnet core having rounded magnet shoes. There is a soft magnetic ring in the flywheel generator being rigidly fastened inside the flywheel in coaxial alignment to it. The permanent magnets are distributed on the surface of each polar tip and attached to the inner surface of the soft magnetic ring without any clearance. The outer surface area of the above-mentioned polar tip is larger than its inner surface area and is determined by the permissible internal magnetic resistance inherent to the permanent magnet. The polar magnet core made from the soft magnet material is installed on the inner ring surface without any clearance and between permanent magnets with polar tips so that when flywheel rotates, if one of the magnet core shoes with power or control winding is positioned opposite to the permanent magnet with polar tip, the second magnet shoe of the same magnet core is always opposite to the polar magnet core and at minimum possible clearance between them.

EFFECT: wide range of ignition advance angle control.

1 cl, 1 dwg

FIELD: internal combustion engines; ignition systems.

SUBSTANCE: invention relates to electrical equipment of ignition systems with accumulation of energy in capacitors. Proposed method of forming spark discharge in capacitor-type ignition system comes to the following: drive power electronic switch is turned on by signal from starting circuit of spark forming cycle. Said switch connects primary winding of ignition coil forming together parallel oscillatory circuit and reservoir capacitor preliminarily charge from main power source whose electric discharge initiates in said circuit a row of dying oscillations of ac current in primary winding of ignition coil, transformed by secondary winding with intensive takeoff of energy of oscillations, into high voltage different pole pulses of damping spark discharge. By short time turning on of drive power electronic switches at moments of time coinciding with passing through zero of ac current amplitude in primary winding of ignition coil, energy of current oscillations is maintained by auxiliary source sufficient to form high voltage different pole pulses of spark discharge at preset amplitude level, duration of spark discharge as a function of engine speed is regulated by forced interruption of process of oscillations of ignition coil primary winding ac current by blocking periodical turning on of power electronic switches by circuit limiting duration of spark discharge.

EFFECT: increased efficiency, reduced toxicity of exhaust gases in gasoline internal combustion engine.

6 dwg

FIELD: automotive industry; automobile electrical equipment.

SUBSTANCE: invention relates to electric devices provides operation of internal combustion engines and it can be used in production and operation of automobiles. Proposed ignition system of internal combustion engine contains ignition coil, distributor connected with secondary winding of coil, spark plugs connected with distributor, electronic current breaker of coil primary winding, engine cylinder piston position pickup connected with breaker and mechanically connected with distributor shaft. System is furnished additionally with pressure transmitter arranged in engine cylinder, comparator, phase-amplitude converter controlled by pulse generator with phase shifter. Position pickup is provided with three induction windings having phase angles corresponding to top dead center (TDC)of piston in cylinder, before and after TDC, winding of pickup with phase before TDC is connected with input of phase shifter whose output is connected with input of electronic current breaker, winding of position pickup with phase after TDC and pressure transmitter are connected with inputs of comparator whose outputs is connected with input of phase-amplitude converter, output of the latter being connected with control input of generator with phase shifter, and pickup with phase of TDC is connected with synchronizer which is connected with synchronizer inputs of generator and comparator. Invention is aimed at increasing economy of engine and is based on electronic adjustment of moment of maximum detonation of working mixture in engine cylinder with position of piston providing maximum conversion of burning energy into mechanical energy of engine rotation.

EFFECT: increased economy of engine.

1 dwg

Magnetoresistor // 2211365
The invention relates to the field of electrical engineering, namely magnetoresistors with contactless ignition system, designed for use on internal combustion engines

The invention relates to sources of electricity that are installed on the internal combustion engines of vehicles, in particular motorcycles, to power the ignition systems of these engines and on-Board network of the motor vehicles (lights, lights, lighting devices)

The invention relates to electronics, in particular for electrical equipment gasoline internal combustion engines with air cooling, and can be used in the ignition systems from flywheel magneto

The invention relates to electric power plants, particularly to ignition systems for magneto

The invention relates to a rotary magneto for ignition system for small internal combustion engines and can be used wherever it is necessary to convert mechanical energy into electrical energy and is moving stream of liquid or gas, can result in the movement of the magnetic system

The invention relates to ignition systems for internal combustion engines, in particular to electronic condenser ignition devices with pulse energy accumulation

FIELD: automotive industry; automobile electrical equipment.

SUBSTANCE: invention relates to electric devices provides operation of internal combustion engines and it can be used in production and operation of automobiles. Proposed ignition system of internal combustion engine contains ignition coil, distributor connected with secondary winding of coil, spark plugs connected with distributor, electronic current breaker of coil primary winding, engine cylinder piston position pickup connected with breaker and mechanically connected with distributor shaft. System is furnished additionally with pressure transmitter arranged in engine cylinder, comparator, phase-amplitude converter controlled by pulse generator with phase shifter. Position pickup is provided with three induction windings having phase angles corresponding to top dead center (TDC)of piston in cylinder, before and after TDC, winding of pickup with phase before TDC is connected with input of phase shifter whose output is connected with input of electronic current breaker, winding of position pickup with phase after TDC and pressure transmitter are connected with inputs of comparator whose outputs is connected with input of phase-amplitude converter, output of the latter being connected with control input of generator with phase shifter, and pickup with phase of TDC is connected with synchronizer which is connected with synchronizer inputs of generator and comparator. Invention is aimed at increasing economy of engine and is based on electronic adjustment of moment of maximum detonation of working mixture in engine cylinder with position of piston providing maximum conversion of burning energy into mechanical energy of engine rotation.

EFFECT: increased economy of engine.

1 dwg

FIELD: internal combustion engines; ignition systems.

SUBSTANCE: invention relates to electrical equipment of ignition systems with accumulation of energy in capacitors. Proposed method of forming spark discharge in capacitor-type ignition system comes to the following: drive power electronic switch is turned on by signal from starting circuit of spark forming cycle. Said switch connects primary winding of ignition coil forming together parallel oscillatory circuit and reservoir capacitor preliminarily charge from main power source whose electric discharge initiates in said circuit a row of dying oscillations of ac current in primary winding of ignition coil, transformed by secondary winding with intensive takeoff of energy of oscillations, into high voltage different pole pulses of damping spark discharge. By short time turning on of drive power electronic switches at moments of time coinciding with passing through zero of ac current amplitude in primary winding of ignition coil, energy of current oscillations is maintained by auxiliary source sufficient to form high voltage different pole pulses of spark discharge at preset amplitude level, duration of spark discharge as a function of engine speed is regulated by forced interruption of process of oscillations of ignition coil primary winding ac current by blocking periodical turning on of power electronic switches by circuit limiting duration of spark discharge.

EFFECT: increased efficiency, reduced toxicity of exhaust gases in gasoline internal combustion engine.

6 dwg

Flywheel generator // 2360140

FIELD: motors and pumps.

SUBSTANCE: flywheel generator contains movable part represented as a flywheel with permanent magnets being provided with polar tips and immovable part represented as a base with power and control windings being installed on magnet core having rounded magnet shoes. There is a soft magnetic ring in the flywheel generator being rigidly fastened inside the flywheel in coaxial alignment to it. The permanent magnets are distributed on the surface of each polar tip and attached to the inner surface of the soft magnetic ring without any clearance. The outer surface area of the above-mentioned polar tip is larger than its inner surface area and is determined by the permissible internal magnetic resistance inherent to the permanent magnet. The polar magnet core made from the soft magnet material is installed on the inner ring surface without any clearance and between permanent magnets with polar tips so that when flywheel rotates, if one of the magnet core shoes with power or control winding is positioned opposite to the permanent magnet with polar tip, the second magnet shoe of the same magnet core is always opposite to the polar magnet core and at minimum possible clearance between them.

EFFECT: wide range of ignition advance angle control.

1 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention concerns ignition systems of internal combustion engines with inductive and capacitive energy storage and can be used in ignition systems of internal combustion engines. Method of discharge voltage reduction in ignition systems of internal combustion engines with inductive and capacitive energy storage consists that spark discharge series is enabled before ignition point when the cylinder pressure is lower than it is at the ignition point, and discharge voltage is lower up to the values 8-10 times less during inlet stroke if the cylinder pressure does not exceed the atmospheric pressure. Spark discharge energy is sufficient for discharge gap breakdown. Due to residual ionisation, spark discharge repetition frequency supports the discharge gap breakdown. Breakdown voltage of the next discharge remains lower than maximum permissible for the used ignition system regardless of pressure increase. Spark discharge duration and energy are insufficient for blended fuel ignition. At the ignition point, spark discharge or discharges energy increases to the value sufficient for blended fuel ignition.

EFFECT: electric loss enhancement in ignition system, more reliable performance, improved engine efficiency and capacity.

1 cl, 7 dwg

FIELD: engines and pumps.

SUBSTANCE: invention refers to method and device for spark energy increase, namely in small "capacitive-discharge ignition systems" without storage batteries intended for internal combustion engines in which striking voltage is created by means of generator and its control circuit, which are connected to handwheel or built into it. Spark energy increasing device includes at least one charging winding (L1), the first rectifier (D1), charging capacitor (C1), primary (L3) and secondary (L4) windings of voltage transformer, the second rectifier (D2) and switching element (Q2). Charging winding (L1) charges capacitor (C1) through the first rectifier (D1). Capacitor (C1) is connected to primary winding (L3). At low speed of engine the switching element (Q2) from time to time short-circuits charging winding (L1) in order to increase the charge of capacitor (C1). Device can contain control unit (M1). Unit (M1) controls switching element (Q2) so that level of charging voltage on charging capacitor (C1) is maintained relatively constant in the whole range of engine speed. Switching element (Q2) can be made so that short circuit can be created for the purpose of engine stop.

EFFECT: maintaining sufficient charge level of capacitor at lower rpm speed.

3 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: system includes at least one charging winding (L) that charges charging capacitor (C1) by means of a flywheel through the first rectifying device (D1), which is connected to primary winding (P) of voltage transformer (30) of ignition for supply to it of spark generation energy by means of secondary winding (S). There is control unit (10) of voltage/voltage switching for energy output (Out21) from primary winding (P), which provides flexible setting of various start-up parameters of ignition system, mainly in small engines, as well as the switching unit provides restriction of output power in response to the change of load and rotation speed of the engine.

EFFECT: improved system for power generation in ignition system with capacitive discharge owing to its flexibility, economy and reliability during the operation.

15 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: invention refers to method and device for spark energy increase, namely in small "capacitive-discharge ignition systems" without storage batteries intended for internal combustion engines in which striking voltage is created by means of generator and its control circuit, which are connected to handwheel or built into it. Spark energy increasing device includes at least one charging winding (L1), the first rectifier (D1), charging capacitor (C1), primary (L3) and secondary (L4) windings of voltage transformer, the second rectifier (D2) and switching element (Q2). Charging winding (L1) charges capacitor (C1) through the first rectifier (D1). Capacitor (C1) is connected to primary winding (L3). At low speed of engine the switching element (Q2) from time to time short-circuits charging winding (L1) in order to increase the charge of capacitor (C1). Device can contain control unit (M1). Unit (M1) controls switching element (Q2) so that level of charging voltage on charging capacitor (C1) is maintained relatively constant in the whole range of engine speed. Switching element (Q2) can be made so that short circuit can be created for the purpose of engine stop.

EFFECT: maintaining sufficient charge level of capacitor at lower rpm speed.

3 cl, 5 dwg

FIELD: transport.

SUBSTANCE: invention relates to field of transport and can be used for combustible mixtures ignition by means of electric spark, in particular in capacitive ignition systems for ignition system control, installed on aircraft engine, for ignition system technical condition evaluation in intervals between aircraft engines start-ups. Aircraft engines capacitive ignition system control device includes discharge current sensor, comparator, discharge current amplitude voltage check value setting device, time interval meter, actuator. Discharge current sensor output is connected to comparator first input, discharge current amplitude voltage check value setting device output is connected to comparator second input. Time interval meter output is connected to actuator. Control device additionally includes ambient environment pressure measuring transducer, containing serially connected ambient environment pressure sensor, amplifier, ambient environment pressure control voltage setting device, second comparator, univibrator, logical device "AND". Ambient environment pressure measuring transducer output is connected to second comparator first input. Ambient environment pressure control voltage setting device output is connected to second comparator second input, comparator output is connected to univibrator input, which output and second comparator output is connected to logical device "AND", by output connected to time interval meter input.

EFFECT: technical result is increasing of aircraft engines capacitive ignition system serviceability control reliability.

1 cl, 1 dwg

Up!