CN102852694B - Spark coil output voltage appraisal procedure and system - Google Patents
Spark coil output voltage appraisal procedure and system Download PDFInfo
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- CN102852694B CN102852694B CN201210299081.0A CN201210299081A CN102852694B CN 102852694 B CN102852694 B CN 102852694B CN 201210299081 A CN201210299081 A CN 201210299081A CN 102852694 B CN102852694 B CN 102852694B
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Abstract
The invention discloses a kind of spark coil output voltage appraisal procedure, by the spark coil maximum output voltage under each effective engine speed and the contrast of mixed gas limit breakdown voltage, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then spark coil output voltage meets engine igniting system requirement; Wherein, under an engine speed, if oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in the initial firing current in the igniting process at ignition coil voltage max place; With the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed.The invention also discloses a kind of spark coil output voltage evaluating system.The present invention can carry out precise evaluation to spark coil output voltage.
Description
Technical field
The present invention relates to automotive electronic technology, particularly a kind of spark coil output voltage appraisal procedure and system.
Background technique
Spark coil is one of kernel component of petrol engine fire road system, and whether its performance directly determines motor can reliable ignition.For spark coil, two parameters are particularly crucial, and one is the output voltage of spark coil, and whether directly determine mixed gas and can effectively be punctured, another, whether the endurance directly determining spark is enough long if being exactly the output energy of spark coil; Under lean combustion state, because chemical energy is very weak, sufficiently long spark duration fully can heat the mixed gas of its periphery, improves the temperature of mixed gas, helps the release of chemical energy, reduces fire loss ratio; But for the PFI(Port Fuel Injection of domestic market main flow, intake port injection) motor, because its air fuel ratio all controls about 1.0, chemical energy is enough strong, and the output energy of spark coil is not clearly on the impact of igniting process.Therefore, the output voltage of spark coil is only parameter the most key in igniting process.
The evaluation criteria of spark coil output voltage is:
The maximum output voltage of spark coil is greater than the mixed gas limit breakdown voltage on real vehicle, considers vehicle scattered error, also will leave certain safe clearance between the two.
The maximum output voltage of a certain duration of charge down-firing coil directly can be measured by external high insulating medium vacuum capacitance and obtain;
Mixed gas limit breakdown voltage will by the simulation of different driving cycles, the mixed gas breakdown voltage maximum value that comprehensive statistics is corresponding under going out each rotating speed.
Visible, in spark coil output voltage evaluation test, the acquisition of mixed gas limit breakdown voltage is link the most key in whole test.Research in " Spark Anemometry of Bulk Gas Velocity at the Plug gap of afiring engine " shows, the breakdown voltage of mixed gas can be described with following formula:
Wherein, K=1.5 × 10
4kVcm
2/ g, a=10
-4g/cm
2, 1g/cm
2=0.980665mbar;
Cylinder pressure corresponding to p-ignition timing; d
g-spark clearance;
From (1) formula, the main and spark clearance size of the breakdown voltage of mixed gas and ignition timing cylinder are pressed into direct ratio.
Spark coil output voltage appraisal procedure, by the spark coil maximum output voltage under each engine speed and the contrast of mixed gas limit breakdown voltage, if under each engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then spark coil output voltage meets engine igniting system requirement.Setting voltage is empirical value, usually between 2kV to 6kV, as being 2kV, 4kV or 6kV.
Existing spark coil output voltage assessment mode, the determination mode of the mixed gas limit breakdown voltage value under one rotating speed is: adopt the clearance limit spark plug in the product life cycle as testing spark plug, change engine load, ignition coil voltage max under motor maximum load point gathers this rotating speed in igniting process, ignition coil voltage max under this rotating speed collected in igniting process, is the mixed gas limit breakdown voltage value under this rotating speed.
Existing spark coil output voltage assessment mode, during due to ignition coil voltage max under collection one rotating speed in igniting process, the situation of catching fire of motor can occur, catch fire may be due to mixed gas do not have breakdown caused by, also be likely caused by fiery nuclear proliferation process, flow perturbation is crumbled and fall, if the ignition coil voltage max under this rotating speed collected in igniting process correspond to mixed gas just at the right time do not have breakdown situation, ignition coil voltage max under this rotating speed so collected in igniting process is exactly the mixed gas limit breakdown voltage value under this rotating speed of mistake, therefore the ignition coil voltage max under this rotating speed collected in igniting process is directly as the limit breakdown voltage value of mixed gas under this rotating speed, carry out follow-up statistical analysis, just be difficult to carry out precise evaluation to spark coil output voltage.
Summary of the invention
The technical problem to be solved in the present invention is, can carry out precise evaluation to spark coil output voltage.
For solving the problems of the technologies described above, the invention provides a kind of spark coil output voltage appraisal procedure, the method is by the spark coil maximum output voltage under each effective engine speed and the contrast of mixed gas limit breakdown voltage, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then spark coil output voltage meets engine igniting system requirement;
Wherein, the mixed gas limit breakdown voltage under each effective engine speed is determined in the following manner:
The secondary two ends of spark coil connect two electrodes of test spark plug respectively, under detecting each engine speed, and the ignition coil voltage max in igniting process and initial firing current;
Under one engine speed, if oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in the initial firing current in the igniting process at ignition coil voltage max place;
With the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed.
Preferably, described test spark plug is the clearance limit spark plug in Life cycle.
Preferably, the spark coil maximum output voltage under each engine speed is determined in the following manner:
The secondary two ends of spark coil disconnect the connection with test spark plug, and connect the two ends of an insulate vacuum electric capacity respectively, and detection obtains the spark coil maximum output voltage under each engine speed.
For solving the problems of the technologies described above, present invention also offers a kind of spark coil output voltage evaluating system, this system comprises a test spark plug, a voltage probe, a current probe, a data logger, an invalid value processing unit, a processor;
Described test spark plug, two electrodes are used for the secondary two ends of contact fire coil respectively;
Described voltage probe, when the secondary two ends of described test spark plug two electrode difference contact fire coil, for detecting the interelectrode voltage of described test spark plug two in igniting process;
Described current probe, for detecting the electric current of described test spark plug one electrode in igniting process to ignition coil secondary one end;
Described data logger, for recording engine rotating speed, the interelectrode voltage of described test spark plug two in igniting process, described test spark plug one electrode in igniting process is to the electric current of ignition coil secondary one end, with the maximum voltage of described test spark plug two interpolar under each engine speed in igniting process, as the ignition coil voltage max under each engine speed in igniting process, output to described invalid value processing unit, with the electric current of described test spark plug one electrode under each engine speed in igniting process to ignition coil secondary one end, as the initial firing current under each engine speed in igniting process, output to described invalid value processing unit,
Described invalid value processing unit, for according to the initial firing current under the ignition coil voltage max under each engine speed in igniting process, each engine speed in igniting process, obtain the mixed gas limit breakdown voltage under each effective engine speed, output to described processor;
The concrete mode obtaining the mixed gas limit breakdown voltage under each effective engine speed is: under an engine speed, if in the igniting process at ignition coil voltage max place, oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in initial firing current; Then with the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed;
Described processor, for the spark coil maximum output voltage under each effective engine speed and mixed gas limit breakdown voltage are contrasted, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then output point fire coil output voltage meets engine igniting system requirement signal.
Preferably, described test spark plug is the clearance limit spark plug in Life cycle.
Preferably, spark coil output voltage evaluating system also comprises an insulate vacuum electric capacity;
Described insulate vacuum electric capacity, for when described test sparking-plug electrode disconnects with spark coil secondary, the secondary two ends of two ends contact fire coil respectively;
Described voltage probe, when the secondary two ends of described insulate vacuum electric capacity two ends difference contact fire coil, detects the voltage obtained between described insulate vacuum electric capacity two ends;
Described data logger, also for the voltage between recording engine rotating speed, insulate vacuum electric capacity two ends, with the maximum voltage under each engine speed between insulate vacuum electric capacity two ends, as the spark coil maximum output voltage under each engine speed, output to described processor.
Spark coil output voltage appraisal procedure of the present invention and system, under not only detecting each engine speed, ignition coil voltage max in igniting process, under also detecting each engine speed, initial firing current in igniting process, is undertaken gathering by data logger by the ignition coil voltage max in igniting process, initial firing current and corresponding engine rotational speed signal and is used for follow-up statistical analysis; In subsequent statistical analysis, ignition coil voltage max corresponding when occurring reverse using initial firing current is removed as invalid value, with the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed, the carrying out of spark coil output voltage is assessed.Spark coil output voltage appraisal procedure of the present invention and system, accurately can identify the igniting process of the state that mixed gas is not breakdown, delete the ignition coil voltage max of its correspondence, significantly reduce the error rate that mixed gas limit breakdown voltage gathers, improve assess effectiveness and the accuracy of spark coil output voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in technological scheme of the present invention, below the accompanying drawing that will use required for the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is spark coil maximum output voltage, mixed gas limit breakdown voltage plotted curve under each effective engine speed;
Fig. 2 is spark coil output voltage appraisal procedure one embodiment schematic diagram of the present invention;
Fig. 3 is spark coil output voltage evaluating system one embodiment schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, carry out clear, complete description to the technological scheme in the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, belong to the scope of protection of the invention.
Embodiment one
Spark coil output voltage appraisal procedure, by the spark coil maximum output voltage under each effective engine speed and the contrast of mixed gas limit breakdown voltage, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then spark coil output voltage meets engine igniting system requirement, as shown in Figure 1, in Fig. 1, square color lump curve represents the spark coil maximum output voltage under each effective engine speed, triangle color lump curve represents the mixed gas limit breakdown voltage under each effective engine speed.Setting voltage is empirical value, usually between 2kV to 6kV, as being 2kV, 4kV or 6kV.
Wherein, the mixed gas limit breakdown voltage under each effective engine speed is determined in the following manner, as shown in Figure 2:
The secondary two ends of spark coil connect two electrodes of test spark plug respectively, under detecting each engine speed, and the ignition coil voltage max in igniting process and initial firing current;
Under one engine speed, if in the igniting process at ignition coil voltage max place, oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in initial firing current;
With the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed.
Preferably, test spark plug is the clearance limit spark plug in Life cycle.
Embodiment two
Based on embodiment one, the spark coil maximum output voltage under each engine speed is determined in the following manner:
The secondary two ends of spark coil disconnect the connection with test spark plug, and connect the two ends of an insulate vacuum electric capacity respectively, and detection obtains the spark coil maximum output voltage under each engine speed.
Embodiment three
As shown in Figure 3, spark coil output voltage evaluating system, comprises a test spark plug, a voltage probe, a current probe, a data logger, an invalid value processing unit, a processor;
Described test spark plug, two electrodes are used for the secondary two ends of contact fire coil respectively, and preferably, test spark plug is the clearance limit spark plug in Life cycle;
Described voltage probe, when the secondary two ends of described test spark plug two electrode difference contact fire coil, for detecting the interelectrode voltage of described test spark plug two in igniting process;
Described current probe, for detecting the electric current of described test spark plug one electrode in igniting process to ignition coil secondary one end;
Described data logger, for recording engine rotating speed, the interelectrode voltage of described test spark plug two in igniting process, described test spark plug one electrode in igniting process is to the electric current of ignition coil secondary one end, with the maximum voltage of described test spark plug two interpolar under each engine speed in igniting process, as the ignition coil voltage max under each engine speed in igniting process, output to described invalid value processing unit, with the electric current of described test spark plug one electrode under each engine speed in igniting process to ignition coil secondary one end, as the initial firing current under each engine speed in igniting process, output to described invalid value processing unit,
Described invalid value processing unit, for according to the initial firing current under the ignition coil voltage max under each engine speed in igniting process, each engine speed in igniting process, obtain the mixed gas limit breakdown voltage under each effective engine speed, output to described processor;
The concrete mode obtaining the mixed gas limit breakdown voltage under each effective engine speed is: under an engine speed, if in the igniting process at ignition coil voltage max place, oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in initial firing current; Then with the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed;
Described processor, for the spark coil maximum output voltage under each effective engine speed and mixed gas limit breakdown voltage are contrasted, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then output point fire coil output voltage meets engine igniting system requirement signal; Setting voltage usually between 2kV to 6kV, as being 2kV, 4kV or 6kV.
Embodiment four
Based on embodiment three, spark coil output voltage evaluating system, also comprises an insulate vacuum electric capacity;
Described insulate vacuum electric capacity, for when described test sparking-plug electrode disconnects with spark coil secondary, the secondary two ends of two ends contact fire coil respectively;
Described voltage probe, when the secondary two ends of described insulate vacuum electric capacity two ends difference contact fire coil, detects the voltage obtained between described insulate vacuum electric capacity two ends;
Described data logger, also for the voltage between recording engine rotating speed, insulate vacuum electric capacity two ends, with the maximum voltage under each engine speed between insulate vacuum electric capacity two ends, as the spark coil maximum output voltage under each engine speed, output to described processor.
Spark coil output voltage appraisal procedure of the present invention and system, under not only detecting each engine speed, ignition coil voltage max in igniting process, under also detecting each engine speed, initial firing current in igniting process, is undertaken gathering by data logger by the ignition coil voltage max in igniting process, initial firing current and corresponding engine rotational speed signal and is used for follow-up statistical analysis; In subsequent statistical analysis, ignition coil voltage max corresponding when occurring reverse using initial firing current is removed as invalid value, with the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed, the carrying out of spark coil output voltage is assessed.Spark coil output voltage appraisal procedure of the present invention and system, accurately can identify the igniting process of the state that mixed gas is not breakdown, delete the ignition coil voltage max of its correspondence, significantly reduce the error rate that mixed gas limit breakdown voltage gathers, improve assess effectiveness and the accuracy of spark coil output voltage.
Identify that the not breakdown principle of mixed gas is as follows:
In normal ignition process, when mixed gas punctures, spark plug two electrode gap forms plasma jet passage, and discharge voltage decays to stationary value rapidly after reaching peak value, and the linear attenuation state of discharge current also progressively decays to zero;
In igniting process, when mixed gas is not breakdown (by cylinder endoscope sem observation spark clearance without arc column), discharge voltage ripple forms semisinusoidal waveform, and discharge current was decayed rapidly after reaching peak value zero-bit occur back current; This phenomenon can be interpreted as the discharge process of spark coil to spark plug the two poles of the earth capacitor charging and electric capacity self.The electric discharge starting stage, along with the increase of discharge voltage, a large amount of free electrons discharges from sparking-plug electrode, and electric current reaches peak value instantaneously; Afterwards, along with the further increase of spark coil output voltage, the positive charge quantity that spark-plug side electrode gathers gets more and more, the voltage difference of lateral electrode and spark coil output terminal starts to reduce, discharge current is decayed gradually, and when output voltage reaches maximum value, the electromotive force of lateral electrode and spark coil output terminal is substantially equal, discharge current decays to zero, charges complete; Along with the reduction of spark coil output voltage, the electromotive force of lateral electrode, higher than the electromotive force of spark coil output terminal, has now entered into the discharge process of electric capacity, and discharge current starts to occur oppositely; Along with the further reduction of output voltage, back current increases gradually; Totally, discharge current decays to zero again in the final release along with electric charge on the two poles of the earth.
In order to verify that non-breakdown conditions discharge voltage becomes this characteristic with electric current further, (voltage reaches 60kV could be breakdown directly to access an insulating medium vacuum capacitor at the output terminal of spark coil, the output voltage of spark coil is no more than 40kV at most), observe the discharge voltage under non-breakdown conditions and current waveform, can find out, the waveform of spark coil under the discharge voltage of insulate vacuum electric capacity and current waveform and the non-breakdown conditions of real vehicle mixed gas is completely the same.Therefore, whether effectively can be punctured with or without oppositely carrying out reliable recognition mixed gas by discharge current.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a spark coil output voltage appraisal procedure, it is characterized in that, by the spark coil maximum output voltage under each effective engine speed and the contrast of mixed gas limit breakdown voltage, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then spark coil output voltage meets engine igniting system requirement;
Wherein, the mixed gas limit breakdown voltage under each effective engine speed is determined in the following manner:
The secondary two ends of spark coil connect two electrodes of test spark plug respectively, under detecting each engine speed, and the ignition coil voltage max in igniting process and initial firing current;
Under one engine speed, if oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in the initial firing current in the igniting process at ignition coil voltage max place;
With the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed.
2. spark coil output voltage appraisal procedure according to claim 1, is characterized in that,
Described test spark plug is the clearance limit spark plug in Life cycle.
3. spark coil output voltage appraisal procedure according to claim 1, is characterized in that,
Spark coil maximum output voltage under each engine speed is determined in the following manner:
The secondary two ends of spark coil disconnect the connection with test spark plug, and connect the two ends of an insulate vacuum electric capacity respectively, and detection obtains the spark coil maximum output voltage under each engine speed.
4. the spark coil output voltage appraisal procedure according to claim 1,2 or 3, is characterized in that,
Described setting voltage is between 2kV to 6kV.
5. spark coil output voltage appraisal procedure according to claim 4, is characterized in that,
Described setting voltage is 2kV, 4kV or 6kV.
6. a spark coil output voltage evaluating system, is characterized in that, comprises a test spark plug, a voltage probe, a current probe, a data logger, an invalid value processing unit, a processor;
Described test spark plug, two electrodes are used for the secondary two ends of contact fire coil respectively;
Described voltage probe, when the secondary two ends of described test spark plug two electrode difference contact fire coil, for detecting the interelectrode voltage of described test spark plug two in igniting process;
Described current probe, for detecting the electric current of described test spark plug one electrode in igniting process to ignition coil secondary one end;
Described data logger, for recording engine rotating speed, the interelectrode voltage of described test spark plug two in igniting process, described test spark plug one electrode in igniting process is to the electric current of ignition coil secondary one end, with the maximum voltage of described test spark plug two interpolar under each engine speed in igniting process, as the ignition coil voltage max under each engine speed in igniting process, output to described invalid value processing unit, with the electric current of described test spark plug one electrode under each engine speed in igniting process to ignition coil secondary one end, as the initial firing current under each engine speed in igniting process, output to described invalid value processing unit,
Described invalid value processing unit, for according to the initial firing current under the ignition coil voltage max under each engine speed in igniting process, each engine speed in igniting process, obtain the mixed gas limit breakdown voltage under each effective engine speed, output to described processor;
The concrete mode obtaining the mixed gas limit breakdown voltage under each effective engine speed is: under an engine speed, if in the igniting process at ignition coil voltage max place, oppositely, then this engine speed and corresponding ignition coil voltage max being removed as invalid value appears in initial firing current; Then with the ignition coil voltage max under each engine speed eliminating invalid value, as the mixed gas limit breakdown voltage under each effective engine speed;
Described processor, for the spark coil maximum output voltage under each effective engine speed and mixed gas limit breakdown voltage are contrasted, if under each effective engine speed, the difference that spark coil maximum output voltage deducts mixed gas limit breakdown voltage is all greater than setting voltage, then output point fire coil output voltage meets engine igniting system requirement signal.
7. spark coil output voltage evaluating system according to claim 6, is characterized in that,
Described test spark plug is the clearance limit spark plug in Life cycle.
8. spark coil output voltage evaluating system according to claim 6, is characterized in that,
Spark coil output voltage evaluating system also comprises an insulate vacuum electric capacity;
Described insulate vacuum electric capacity, for when described test sparking-plug electrode disconnects with spark coil secondary, the secondary two ends of two ends contact fire coil respectively;
Described voltage probe, when the secondary two ends of described insulate vacuum electric capacity two ends difference contact fire coil, detects the voltage obtained between described insulate vacuum electric capacity two ends;
Described data logger, also for the voltage between recording engine rotating speed, insulate vacuum electric capacity two ends, with the maximum voltage under each engine speed between insulate vacuum electric capacity two ends, as the spark coil maximum output voltage under each engine speed, output to described processor.
9. the spark coil output voltage evaluating system according to claim 6,7 or 8, is characterized in that,
Described setting voltage is between 2kV to 6kV.
10. spark coil output voltage evaluating system according to claim 9, is characterized in that,
Described setting voltage is 2kV, 4kV or 6kV.
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| CN104279113B (en) * | 2013-07-04 | 2017-10-10 | 重庆长安汽车股份有限公司 | A kind of vehicular engine ignition energy test device |
| CN103941720B (en) * | 2014-03-24 | 2017-01-25 | 联合汽车电子有限公司 | Fault diagnosis circuit and method of internal-drive electrically-controlled ignition system |
| CN104963801B (en) * | 2015-07-20 | 2017-01-04 | 桂凌云 | The method of testing of automobile Ignition Coil Measuring System |
| CN106706324B (en) * | 2016-12-23 | 2019-03-08 | 广西三原高新科技有限公司 | A kind of COP ignition signal detector and test macro |
| CN113357069B (en) * | 2020-03-04 | 2023-02-03 | 上海华依汽车混合动力系统测试技术有限公司 | Cold test ignition control and test system based on current signal and test method thereof |
| CN111720251B (en) * | 2020-06-15 | 2022-04-22 | 深圳市健科电子有限公司 | Ignition coil monitoring device |
| CN112761845B (en) * | 2021-01-20 | 2022-08-12 | 联合汽车电子有限公司 | Ignition coil output energy assessment method and test system thereof |
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| CN1145983A (en) * | 1995-07-05 | 1997-03-26 | 罗伯特-博希股份公司 | Ignition device of internal combustion engine |
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