Measurement device in radio frequency ignition system

FIELD: electrical engineering.

SUBSTANCE: invention relates to a measurement device, comprising the following components: radio frequency ignition power supply circuit (2) containing a transformer (T) the secondary winding whereof (LN) is connected to at least of resonator (1) having resonance frequency in excess of 1 MHz and containing two electrodes (11, 12) designed so that to enable spark generation when an ignition command is given; measuring capacitor (Cmesure) placed in series between the secondary winding and the resonator; circuit (DIFF) for measurement of current (Iion) of gases ionisation during burning inside a cylinder of the internal-combustion engine linked to the resonator. The said measurement circuit is connected to the measuring capacitor contacts and/or - circuit (RED) for measurement of voltage (Vout) on the resonator electrodes contacts when an ignition command is given. The circuit is connected to the measuring capacitor contacts.

EFFECT: possibility of simultaneous measurement of ionisation current and voltage.

8 cl, 4 dwg

 

The present invention relates to a measurement device in the system radiofrequency ignition with electronic control for an internal combustion engine, configured to measure current ionization of gases in the cylinders of the engine and/or measure the voltage on the contacts of the electrodes of the spark plug at the time of submitting the command to the ignition.

The current measurement of ionization of the gases in the engine cylinders is usually produced after ignition and preferably applied, for example, for detection of the angle corresponding to the peak pressure in the combustion chamber, the detonation or to identify misfires.

Known circuit current measurement of ionization for classic ignition system. Such schemes include the polarization of the mixture in the combustion chamber after the generation of sparks between the electrodes of the spark plug, to measure the current resulting from the spread of sparks.

Classically, such schemes have in the lower part of the secondary winding of the ignition coil connected to the spark plug.

However, these schemes require compatibility with the characteristics of classic plugs in and of themselves may not be adapted to the ignition systems by generating plasma using spark ignition type RF coils-candle (TOGETHER), described in detail in the following patent stated the Kah, filed on behalf of the applicant: FR 03-10766, FR 03-10767 and FR 03-10768.

Therefore, the present invention is directed, in particular, to devices for measuring the ionization current, adapted for a system of radio frequency ignition.

Another challenge is the implementation on the basis of the same device simultaneously or not simultaneously with the measurement of the ionization current measurement voltage to the electrode contacts of the radio frequency coil-spark during command on the ignition.

With this objective in mind, an object of the invention is a measuring device, containing:

- power radio-frequency ignition containing the transformer, the secondary winding of which is connected, at least one resonator having a resonant frequency greater than 1 MHz, and containing two electrodes, configured to generate sparks during command on ignition

measuring capacitor, connected in series between the secondary winding and the resonator,

diagram of the current measurement of ionization of gases during the combustion in the cylinder of an internal combustion engine, is connected to the resonator, with the specified measuring circuit connected to the contacts of the measuring capacitor, and/or

diagram of the measurement voltage on the contacts of the electrodes of the resonator during command on the ignition, with asana circuit connected to the contacts of the measuring capacitor.

According to a variant implementation, the measuring capacitor connected in series between the secondary winding of the transformer and the resonator at the level of the wire return path of current through the body of the transformer and the resonator.

Preferably the device comprises a dampening resistor, connected in parallel with the primary winding of the transformer.

According to another characteristic, the device comprises a DC voltage source connected with the lower part of the secondary winding of the transformer.

Preferably, the circuit current measurement of ionization contains a diagram of the differentiation potential difference between the contacts of the measuring capacitor.

Preferably, the circuit for measuring the voltage at the contacts of the electrodes of the resonator includes a rectification circuit peak voltage on the contacts of the measuring capacitor.

According to a variant implementation, the primary winding of the transformer is connected, on the one hand, with the source of supply voltage and, on the other hand, runoff, at least one transistor switch, managed control signal, the transistor switch supplies power to the contacts of the primary winding at a frequency defined by the control signal.

Preferably, the transformer has a variable transformation ratio.

The other item is snake and advantages of the present invention will be more apparent from the following description, presented as illustrative and not restrictive example, with reference to the accompanying drawings, on which:

figure 1 - scheme of the resonator simulating radio frequency coil-spark generating plasma;

2 is a diagram illustrating the power supply circuit of the prior art, allows you to apply an alternating voltage in the range of radio frequencies on the contacts of the coil-spark;

figure 3 is a diagram illustrating a variant of the circuit shown in figure 3;

4 is a diagram illustrating the power supply circuit in accordance with the present invention, adapted for measuring the ionization current and voltage on the contacts of the electrodes during the reset command on the ignition.

Coil-spark used under controlled radiofrequency ignition, is the electrical equivalent of the resonator 1 (see figure 1), the resonance frequency Fe which is greater than 1 MHz and is usually close to 5 MHz. The resonator contains a serially connected resistor Rs, the inductor Ls and the capacitor is denoted by Cs. The electrodes 11 and 12 of the ignition coil-spark connected with the contacts of the capacitor Cs of the resonator, allowing the generation of mnogochasovykh discharges to initiate ignition of the mixture in the combustion chambers of the engine, when the resonator serves food.

Indeed, when the resonator serves high voltage which begins at its resonance frequency F cthe amplitude of the contacts of the capacitor Cs increases, which allows you to create mnogochasovye discharges between the electrodes at distances of the order of centimeters with a strong pressure and peak voltages less than 25 kV.

In this case we speak of ramified places, because they involve the simultaneous generation of at least a few lines or paths of ionization in this volume, in addition, their branching is multidirectional.

This application for radio frequency ignition requires the use of a circuit that can generate voltage pulses of the order of 100 NS, which can reach amplitudes of the order of 1 kV at a frequency very close to the resonant frequency of the resonator generating plasma radiofrequency coil-spark.

Such a circuit 2 power supply, described in detail in patent application FR 03-10767, schematically shown in figure 2. In this power supply circuit of the radio frequency coil-spark classically used wiring diagram, called a "power amplifier pseudo-class E". This wiring harness allows you to create voltage pulses with the above characteristics.

This circuit diagram includes a source of an intermediate DC voltage Vinter, which can vary from 0 to 250 V, power MOS transistor M and the parallel resonance is J. 4, containing the coil Lp, connected in parallel with capacitor Cf. The transistor M is used as a switch to control the switching contacts of the parallel resonant circuit and the resonator 1 generate plasma intended for connection with the output interface OUT of the food chain.

The transistor M is controlled at its gate logic control signal V1, issued by the managing cascade 3 frequency, which should essentially correspond to the resonant frequency of the resonator 1.

The intermediate DC supply voltage Vinter preferably receive from a source of high voltage, as a rule, the inverter DC voltage constant.

Thus, within its resonant frequency of the parallel resonator 4 converts the DC supply voltage Vinter in increased periodic voltage Va corresponding to voltage multiplied by the gain of the voltage of the parallel resonator, and supplied to the output interface of the supply circuit at the level of the drain of the transistor switch M

The transistor switch M delivers the amplified voltage to the output of the supply circuit at a frequency defined by the control signal V1, which must be as close to the resonant frequency of the coil-spark so that sgenerirovat the high voltage at the electrode contacts of the coil-spark, necessary for the development and maintenance of mnogourovnego category.

Thus, the transistor switches currents at a frequency of approximately 5 MHz and a voltage of the drain-source, which can take up to 1 kV. The selection transistor is thus crucial, and requires a compromise between voltage and current.

According to the variant shown in figure 3, the parallel coil Lp is replaced by a transformer T having a ratio in the range from 1 to 5. The primary winding Lmthe transformer is connected to one side of the source voltage Vinter, and on the other side with the drain of the transistor switch M, managing supply voltage Vinter on the contacts of the primary winding at a frequency defined by the control signal V1.

The secondary winding of the LNthe transformer is designed for connection with the coil-spark plug. One end of the secondary winding is connected to the mass by means of a wire 6 the return path of current through the body. Thus, the resonator 1 coil-spark connected with the contacts of the secondary winding of the connecting wires 5 and 6, one of which is a wire 6 reverse current path through the housing, receives power from the secondary winding of the transformer.

Adaptation transformation ratio allows in this case to reduce the voltage of the drain-source of the transistor. However, the reduction in voltage is of the primary winding leads to increased current, passing through the transistor. In this case, you can compensate for this increase by parallel connection of two transistors that are managed by the same Manager cascade 3.

Figure 4 shows the adaptation scheme described above with reference to figure 3, for the present invention.

This primarily provides a measuring capacitor, marked Cmesure in figure 4, connected in series between the secondary winding of the transformer circuit 2 power radiofrequency ignition and the resonator 1 of the radio frequency generating plasma on the wire 6 the return path of current through the body of the transformer and the resonator.

As shown in more detail below on the basis of the measuring condenser is possible to measure the ionization current at the time of combustion gases in the chamber and/or measurement of the voltage on the electrode contacts of the coil-spark during command on the ignition.

Also includes a DC voltage source that outputs a voltage Vpolar comprising from 12 to 250V, which can be a battery voltage or a constant intermediate voltage Vinter to connect through a resistor Rpolar to the bottom of the secondary winding of the transformer. The role of this power source is polarized electrode of the high voltage coil-spark, connected to the output of the power supply circuit classifies the flax of the cylinder head of the engine.

Finally, if necessary, in parallel with the primary winding of the transformer T can be connected weakening resistor Rstop. This resistor allows to weaken the residual voltage at the contacts of the primary winding after the termination command to the transistor M, that is, after generating sparks. The presence of this resistor is preferably allows the measurement of the ionization current as soon as possible after the command completes ignition, which is explained in detail below.

The power supply circuit shown in figure 3, adapted for measuring the ionization current. Current ionization corresponds to the propagation of the flame front inside the combustion chamber. Therefore, we are talking about the signal, which allows you to monitor the development and the type of ongoing combustion. This ionization current can be measured at the completion of the distribution of sparks for at least 1 MS, and he has an amplitude of about 20 μa. Therefore, the current measurement of ionization produced after the end of the ignition.

In particular, for example, at 6250 rpm the engine makes one revolution in 10-2s, i.e. 26 ISS/°. Because combustion occurs in approximately 40° of the crankshaft, the deviation in 100 μs (i.e. approximately 4° of the crankshaft when the maximum mode) after ignition to reduce the suppression of the current measurement of the ignition.

As mentioned above, the attenuation is improved by adding a resistor in parallel with the primary winding of the transformer, the output of which is connected to the coil-spark.

The current measurement of ionization in accordance with the present invention is produced by the contact of the measuring capacitor Cmesure during combustion. For this purpose, the contacts of the measuring capacitor Cmesure connect the measuring circuit DIFF type of differentiator.

Thus, the measurement of the ionization current in accordance with the present invention is produced by the contact of the measuring capacitor Cmesure during combustion. Equivalent discharge during combustion can be modeled using a resistor Rion value of about 500 ohms, is connected in parallel with the capacitor Cs of the resonator 1 generate plasma.

According to the exemplary embodiment shown in figure 4, the differentiating circuit DIFF, used to measure the ionization current, contains the operational amplifier 10, fed by voltage Vlow. Inverting input of the amplifier is connected to the contact of the measuring capacitor Cmesure through the condenser, denoted With a capacity equal to, for example, 100 nF, not inverting input is connected to another contact of the measuring capacitor through the same capacitor, and the output Vs closed on a non-inverting input through a resistor labeled R, for example,equal to 100 Ohms.

In addition, not inverting input is polarized by a voltage amplifier. First, this voltage Vlow is filtered by the RC circuit containing a resistor with a value, for example equal to 4/5R, connected in series with the capacitor C1. After that, the filtered voltage VAserved on a non-inverting input through resistor bridge dividing the voltage consisting of two resistors, each of value, for example, 2R.

Output voltage Vs differential scheme is, thus, derived from the potential difference on the contacts of the capacitor Cmesure, that is:

,

where Iion is the ionization current. From here you can directly display the current passing through the capacitor Cmesure, which is the ionization current:

,

where

In addition to adapting to measure the ionization current during combustion according to the above principles, at the expense of the measuring condenser is installed in series between the transformer T and the resonator 1, the power supply circuit shown in figure 3, can also be adapted to measure the voltage Vout at the electrode contacts of the coil-spark during command on the ignition (that is, while the control signal is supplied to the transistor M). This voltage measurement, you can use the diamonds for optimal monitoring of the development of sparks.

For this purpose, the contacts of the measuring capacitor Cmesure connect rectifying circuit RED, allowing you to select the maximum voltage on the contacts of the measuring capacitor during the reset command to the ignition. Rectifying scheme implemented by setting the diode D in series with the load resistive type with a value of R1, for example, select is equal to 100 Ohms. On the contact load at the time of submitting commands to the ignition receive the voltage V s, preferably proportional to the high voltage Vout at the electrode contacts of the coil-spark.

Indeed, since the parasitic capacitances of the transformer can be neglected, galvanic isolation allows to obtain the same current through the measuring capacitor Cmesure and the capacitor Cs of the resonator 1, a modeling reel-candle. So get a capacitive divider according to the following relationship (assuming negligible deviation, resulting from the voltage drop across the contacts of the diode (D):

For example, if CS=20 pF, Cmesure=40 nF and Vout from 0 to 24 To get the following result:

To optimize rectifying circuit, at the input of the diode D in series with them establish a decoupling capacitor, labeled C3 in figure 4, for example, with a value of capacitance of 100 nF, and resis the EOS R3 connection to earth, in order to eliminate the DC component of the signal at the input of the rectifying circuit. The capacitor is denoted by C2, capacity of, for example, equal to 1 nF, installed in parallel with the resistive load at the output of the rectifying circuit, provides storage peak voltage.

Thus, the measurement of the voltage on the contacts of the measuring capacitor Cmesure at the time of submitting commands to the ignition preferably allows to obtain a measurement that characterizes the voltage at the electrode contacts of the coil-spark.

Preferably, this measurement allows you to:

- to know the breakdown voltage of the coil-spark,

to determine the resonant frequency of the resonator 1 by determining the maximum gain,

- to identify the formation of bridge (i.e. sudden discharge of the capacitor Cs of the resonator, leading to the formation of a single spark instead of branching sparks) with a sudden drop in amplitude measurements, and

to diagnose separation between the power circuit and coil candle.

The solution described in the framework of this application, allows, thus, with the help of a measuring capacitor, installed in series on the output circuit of the radio frequency ignition, simultaneously measuring the ionization current and measuring the voltage at the electrode contacts coil and candles during command on the ignition or only one or the other of these dimensions, depending on, connect if both the above schemes for the implementation of these measurements to the contacts of the capacitor Cmesure or only one or the other of these schemes.

1. A measuring device, comprising:
chain (2) RF power plugs containing the transformer T, the secondary winding (LN) which is connected at least one resonator (1)having a resonant frequency greater than 1 MHz, and containing two electrodes (11, 12), arranged to generate sparks during command on ignition
the measuring capacitor (Cmesure), connected in series between the secondary winding and the resonator,
scheme (DIFF) measurement current (Iion) ionization of gases during the combustion in the cylinder of the internal combustion engine associated with the resonator, with the specified measuring circuit connected to the contacts of the measuring capacitor, and/or
scheme (RED) measure the voltage at the contacts of the measuring capacitor made with the possibility of issuing voltage (V s), is proportional to the voltage (Vout) on the contact electrodes of the resonator at the time of submitting the command to the ignition.

2. The device according to claim 1, in which the measuring capacitor (Cmesure) connected in series between the secondary winding of the transformer and the resonator at the level of the wires (6) the return path of current through the body of the transformer and the reason the Torah.

3. The device according to any one of claims 1 or 2, characterized in that it includes a dampening resistor (Rstop), connected in parallel with the primary winding of the transformer.

4. The device according to claim 1, characterized in that it includes a source of DC voltage (Vpolar)connected to the secondary winding of the transformer with the ability polarization electrode of the high voltage coil-spark, connected to the output of the power supply circuit, relative to the cylinder head of the engine.

5. The device according to claim 1, characterized in that the circuit (DIFF) current measurement of ionization contains a diagram of the differentiation potential difference between the contacts of the measuring capacitor.

6. The device according to claim 1, characterized in that the circuit (RED) measurement voltage (Vout) on the contacts of the measuring capacitor includes a rectification circuit peak voltage on the contacts of the measuring capacitor.

7. The device according to claim 1, characterized in that the primary winding of the transformer is connected on the one hand to the supply voltage (Vinter), and on the other side to the drain of at least one transistor switch (M), managed by the control signal (VI), and the transistor switch supplies power to the contacts of the primary winding at a frequency defined by the control signal.

8. The device according to claim 1, described is Eesa fact, the transformer (T) has a ratio in the range from 1 to 5.



 

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