Diagnostic of contamination state of plugs of radio frequency ignition system

FIELD: electricity.

SUBSTANCE: device for radio frequency ignition includes control aids (5) designed with possibility of ignition control signal (VI) generation, power circuit (2) controlled by ignition control signal (VI) for power voltage supply to output interface (OUT) of power circuit at frequency determined by control signal, at least one resonator (1) of plasma generation connected to output interface of power circuit and designed with possibility of spark generation between two electrodes (10, 12) of ignition of the resonator during ignition command. This device includes means (6) for measuring of electrical parameter characterising change of resonator power voltage, module (7) for determination of state of electrodes contamination depending on measured electrical parameter and predetermined control value.

EFFECT: enhancing diagnostics of contamination state of radio-frequency coil-plug electrodes.

11 cl, 4 dwg

 

The present invention generally relates to systems used to generate plasma between the two electrodes, used in particular for radio controlled ignition of the gas mixture in the combustion chambers of the internal combustion engine.

In particular, an object of the present invention is the RF device plugs containing:

- management tools, configured to generate a signal of the ignition control,

- supply circuit that is controlled by the control signal ignition to supply power to the output interface of the supply circuit at a frequency determined by the control signal,

at least one resonator generating plasma is connected with an output interface of the supply circuit and configured to generate a spark between the two electrodes of the specified resonator at the time of filing the team on the ignition.

In the version of application for automotive spark generating plasma using coil-spark (described in detail in the following patent applications, filed in the name of applicant: FR 03-10766, FR 03-10767 and FR 03-10768), modeled in the form of resonator 1 (see figure 1), the resonant frequency Fcwhich is more than 1 MHz and is usually close to 5 MHz. The resonator contains a serially connected resistor R, inductor L and capacitor C. electrode 10 and 12 ignition coil-spark connected with the contacts of the capacitor of the resonator, providing generation mnogochasovykh discharges to initiate ignition of the mixture in the combustion chamber of the engine, when the resonator serves food.

Indeed, when the resonator serves a high voltage at its resonant frequency Fc(l/2P), the amplitude of the contacts of the capacitor increases, which allows you to create mnogochasovye discharges between the electrodes at distances of the order of centimeters at high pressure and peak voltages less than 20 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 option is applied to the radio frequency ignition requires the use of a circuit that can generate voltage pulses, typically 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. The smaller the difference between the resonant frequency of the resonator and an operating frequency of the source, the higher the gain voltage of the resonator (the ratio between the amplitude of its output voltage and the input voltage).

Taka is the food chain, described in detail in patent application FR 03-10767, schematically shown in figure 2. In this power supply circuit is classically applied to wiring diagram, called a "power amplifier class E". This type of inverter DC to AC allows you to create voltage pulses with the above characteristics.

According to a variant of execution, shown in figure 2, this power supply circuit 2 includes a power MOS field-effect transistor M and the parallel resonant circuit 4 containing the inductor 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, which is designed to connect to the output interface OUT of the food chain.

Means 5 controls the power supply circuit configured to generate a logical signal V1 control, intended for supply to the gate of the transistor M on the frequency, which should be essentially regulated by the resonance frequency of the resonator 1.

The above-described ignition device is powered by a voltage Vinter present at the contacts of the capacitor Cb of the food chain. Preferably the voltage Vinter comes from a source of high voltage connected to the capacitor Cb and which is usually pre what OBRAZOVATEL constant 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

Switch M delivers the amplified voltage Va at the output of the supply circuit at a frequency determined by the signal V1 of the control that you want to be close to the resonant frequency of the coil-spark. Indeed, during the command on the ignition to get the resonance device radio frequency ignition and to provide the maximum voltage at the electrode contacts of the coil-spark to obtain the expected sparks, management of the coil-spark plug needs to be done essentially at its resonance frequency.

In the context of controlled ignition in the cylinder of the internal combustion engine coil-spark screw up on the engine, and the Central electrode is placed in the combustion chamber of the corresponding cylinder of the engine. However, when a plasma discharge generated by the coil-spark may occur the phenomenon of pollution candles, which is characterized by the deposition of combustion products in the form of soot on the Central electrode and ceramics around the candles. When exceeding a certain level of contamination of this phenomenon interferes with the normal operation of the coil-spark and cause misfires.

Still the most common way to diagnose contamination of the electrodes of the coil-spark was its withdrawal from the slot of the combustion chamber, and determining the status of pollution by means of visual analysis.

The present invention is to improve the diagnostics of the state of contamination of the electrodes RF coil-spark.

The device in accordance with the present invention, corresponding to the definition given in the introductory part of the description, mainly characterized in that it contains:

- means of measuring the electrical parameters of the power supply voltage of the resonator, and

module determine the state of contamination of the electrodes based on the measured electrical parameter and a predetermined reference value.

Preferably the electrical parameter is voltage on the contacts of the capacitor circuit made with the possibility of charging from a power supply to supply commands to the ignition.

According to a variant implementation, the power supply circuit includes a switch controlled by the control signal ignition to supply power to the output int is has on the frequency, defined control signal.

Preferably the control frequency essentially equal to the resonance frequency of the resonator generating plasma.

Used resonator generating a plasma made with the implementation of ignition in the following variations apply: a controlled ignition of the internal combustion engine, the ignition in the filter-catcher of the particles, the ignition enable cleaning of the air conditioning system.

Preferably the device in accordance with the present invention contains a means of delivery of information about the state of contamination of the electrodes installed on the interface level, the "man-machine" of the car.

The object of the present invention is also a method for diagnosing the state of pollution of the ignition electrodes, at least one RF resonator generating plasma is connected to the output interface of the supply circuit configured to supply the specified output interface supply voltage at a controlled frequency during command on the ignition, with the specified resonator configured to generate a spark between the two electrodes during the reset command on the ignition, with this method differs in that it contains the following stages:

- during command on ignition measure of the change of electric parameter, characterizing the power supply voltage,

- measured change is compared with a predetermined reference value;

- the state of contamination of the electrodes is determined depending on the difference between the measured change and the control value.

Preferably measure the change in the voltage on the contacts of the capacitor circuit, with the specified capacitor is charged when the supply voltage before applying the command to the ignition.

According to a variant implementation, the measured change stems from the difference between the measurement of the voltage on the contacts of the capacitor at the beginning and at the end of the command to the ignition.

Preferably, the reference value corresponds to the specified change to pollution.

Preferably the method comprises a stage on which the user receives information about the state of pollution. Preferably such information is received by the user, warns him about the possible emergency malfunction of the ignition.

Other characteristics and advantages of the present invention will be more apparent from the following description, provided as an illustrative and non-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 of a circuit used to control the resonator coil-spark, shown in figure 1;

figure 3 is a block diagram illustrating an example of the method for diagnostics of contamination of the electrodes of the coil-spark;

4 is a diagram illustrating the effects of pollution ignition electrodes to change the voltage on the contacts of the capacitor b supply circuit during the reset command on the ignition.

The ignition device in accordance with the present invention includes means 6 for the measurement of electrical parameters of the power supply voltage of the resonator generating plasma at the time of submitting commands to the ignition, module 7, is arranged to determine the state of pollution of the ignition electrodes based on the measured electrical parameter and a predetermined reference value.

Consider an electric parameter is, for example, the voltage Tcbon the contacts of the capacitor b supply circuit, measured at least in two specific torque command to the ignition.

Thus, in two specific time command on the ignition, selected, for example, at the beginning or at the end or immediately after issuing a command to the ignition on, measure the voltage drop across the contacts b, for example, using Altmer 6, measuring voltage Tb. Module 7, which may be, for example, integrated in the means 5 controls, removes this electrical measurement through the receiving interface 51 and determines the state of pollution of the ignition electrodes depending on the electrical measurements of voltage and a predetermined reference value, which will be explained in more detail below.

The choice of measuring the voltage on the contacts of the capacitor b at some point command on the ignition to diagnose the state of pollution of the ignition electrodes is derived from the following calculations:

Tcb(t) is the voltage at the contacts of the capacitor b depending on time;

Vm(t) is the voltage at the contacts of the capacitor depending on the time.

At time t=0 on the control gate of the switch M control signal V1, which allows to apply high voltage on the pins of the resonator coil-candles at a frequency defined by the control signal V1.

At time t=D, the next signal ignition control during the time period D, between the electrodes 10 and 12 of the ignition spark appears.

The energy balance of the coil-spark shows:

where Vm(t=0)=0

When you do this:

Tcb_n(t) - voltage is and the contacts of the capacitor b depending on the time command on the ignition, when the coil-spark is new, that is, to pollution of the ignition electrodes;

Tcb_e(t) is the voltage at the contacts of the capacitor b depending on the time command on the ignition when the ignition electrodes of the coil-spark contaminated;

Vm_n(t) is the voltage at the contacts of the capacitor of the resonator depending on the time command on the ignition, when the coil-spark is new, that is, to pollution of the ignition electrodes;

Vm_e(t) is the voltage at the contacts of the capacitor of the resonator depending on the time command on the ignition when the ignition electrodes of the coil-spark polluted, and from the previous equation it follows:

and

Consequently, when Vm_e(t)<Vm_n(t) one can deduce the following equation for diagnostics of pollution ignition electrodes for Tcb_n(t=0)=Tcb_e(t=0):

Tb_(t=D)>Tb_n(t=D)

In other words, as shown in figure 4, the voltage drop across the contacts of the capacitor CAMPING during command on the ignition (characterized by the difference between the value of the voltage on the contacts b, measured at time t=D, and the value of the voltage measured at the moment t=0) will be the smaller, the more polluted the ignition electrodes.

Energy is eticheski balance, shown above, can be obtained for the managed frequency essentially equal to the resonance frequency of the resonator. Indeed, since the voltage drop across the contacts of the capacitor b when submitting commands to the ignition is maximum when the RF resonator coil-spark is operated at its resonant frequency, the voltage measurement is made on the contacts of the capacitor b during command on the ignition and used to diagnose the condition of contamination, will be more significant.

Figure 3 shows an example of algorithm for diagnosis of the state of pollution of the ignition electrodes, based on the measurement of the voltage drop across the contacts of the capacitor b supply circuit during the reset command on the ignition.

At the first stage 100 determines the reference value of the voltage drop ∆ TcbRef on the contacts of the capacitor b for new candle, that is, until the contamination of ignition electrodes, between two specific points of the team plugs in these conditions, ignition, when it comes to the supply voltage, the duration D of the application of the control signal V1 and the control frequency is selected, for example, is essentially equal to the resonance frequency of the resonator.

At step 101 serves the identical voltage value and generate the control signal V1 is identical to continue the work on the same managed frequency, served on the control gate of the transistor M to give a command for the resonator generating plasma.

During step 102 measures the change in the voltage on the contacts of the capacitor b in the same certain points in the team's ignition, the points selected for determining the control values. For example, these points correspond to t=0 and t=D applications team ignition, when the voltage drop across the contacts of the capacitor b is the most significant. Thus, the measured differential voltage Tcb(t=0)-Tcb(t=D), corresponding to the change in the voltage on the contacts b at the beginning and at the end of the ignition, at the moments t=0 and t=D application of the control signal V1.

The main thing is that the measured value changes and control is characterized by the same moments commands ignition, and in identical conditions of the application.

Then at step 103 that the measured value changes Tcb(t=0)-Tcb(t=D) is compared with a predetermined reference value ΔTcbRef.

During the step 104 determines the state of pollution of the ignition electrodes depending on whether the calculated difference between the measured value changes and the reference value exceeds a certain threshold.

In this case, depending, in particular, on the type of ispolzuemuyu-candles and conditions engine performance specialist will be able to set different thresholds, beyond which the calculated difference characterizes, for example, the weak state of pollution, the pollution condition or a state of severe contamination of the electrodes of the ignition.

In case it is possible to provide measurements of the voltage on the contacts of the capacitor b every moment of commands ignition. These consecutive measurements of the voltage drop across the contacts b during the team's ignition specialist will be able to optimally use to diagnose the condition of contamination of the electrodes of the ignition.

As applied to the ignition of the car, with the generation of plasma, it is possible to use such diagnostic pollution candle in order to warn the driver of possible emergency malfunction of the ignition system. Therefore, at least partially in the cab establish a means of obtaining information about the state of pollution of the candles. For example, at the level of the interface man-machine" light is lit malfunction indicator light to warn the driver about an imminent failure of the ignition in the ignition system, depending on the produced diagnostic pollution.

You can also implement emergency mode for coil-spark, diagnostics of the state of contamination of the electrodes which shows that the expected failure. In this case, the coil-spark is controlled by p is the submission of a special voltage with defined parameters of amplitude, frequency and duration in such a way as to slow the failure of the component.

1. The device the wireless ignition containing:
means (5) control, configured to generate a signal (VI) ignition control,
chain (2) power-driven signal (VI) ignition control, to supply power to the output interface (OUT) supply circuit at a frequency determined by the control signal,
at least one resonator (1) generating plasma is connected with an output interface of the supply circuit and configured to generate a spark between the two electrodes (10, 12) ignition of the specified resonator during command on ignition
characterized in that it contains:
means (6) measure the electrical parameters of the power supply voltage of the resonator, and
module (7) determine the status of contamination of the electrodes based on the measured electrical parameter and a predetermined reference value.

2. The device according to claim 1, wherein the electrical parameter is voltage on the contacts of the capacitor (b) circuit made with the possibility of charging from a power supply to supply commands to the ignition.

3. The device according to claim 1 or 2, characterized in that the power circuit contains a switch(M), controlled signal (VI) ignition control, to supply power to the output interface at a frequency determined by the control signal.

4. The device according to claim 1, characterized in that the controlled frequency essentially equal to the resonance frequency of the resonator generating plasma.

5. The device according to claim 1, characterized in that the resonator generating a plasma made with the implementation of ignition in the following variations apply:
controlled ignition internal combustion engine, the ignition in the filter-catcher of the particles, enabling purification of the air conditioning system.

6. The device according to claim 1, characterized in that it contains means of delivery of information about the state of contamination of the electrodes set at the interface level car "man-machine".

7. A method for diagnosing the state of contamination of the electrodes (10, 12) ignition, at least one RF resonator generating plasma is connected to the output interface (OUT) circuit (2) power supply configured to supply the specified output interface supply voltage on the control frequency at the time of submitting commands to the explosion, including the generation of a spark between the two electrodes of the resonator during command on the ignition, characterized in that
at the time of submitting commands to the ignition signal is ut (102) a change in the electrical parameter, characterizing the voltage changes,
compare (103) measured the change from pre-defined (100) reference value; and
define (104) the state of contamination of the electrodes depending on the difference between the measured change and the control value.

8. The method according to claim 7, characterized in that the measured change of the voltage on the contacts of the capacitor (b) circuit, with the specified capacitor is charged by the supply voltage before applying the command to the ignition.

9. The method according to claim 8, characterized in that the measured change is the difference between the measurement of the voltage on the contacts of the capacitor (b) at the beginning and at the end of the command to the ignition.

10. The method according to claim 7, wherein the reference value corresponds to the specified change to pollution.

11. The method according to claim 7, characterized in that it includes providing the user with information about the state of pollution, allowing to warn the user about possible emergency malfunction ignition.



 

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