CN104481773A - Variable-energy ignition measuring and controlling system and method - Google Patents
Variable-energy ignition measuring and controlling system and method Download PDFInfo
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- CN104481773A CN104481773A CN201410742400.XA CN201410742400A CN104481773A CN 104481773 A CN104481773 A CN 104481773A CN 201410742400 A CN201410742400 A CN 201410742400A CN 104481773 A CN104481773 A CN 104481773A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/121—Testing characteristics of the spark, ignition voltage or current by measuring spark voltage
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention relates to a variable-energy ignition measuring and controlling system and method. The system comprises a charging loop, a discharging loop and a drive control circuit. The charging loop comprises a linear direct-current constant voltage source, and a first diode, a first resistor, a charging control switch, a second diode and a capacitor group which are sequentially connected between the linear direct-current constant voltage source and a cathode. The discharging loop comprises a discharging control switch, an ignition coil, a voltage probe, an ignition electrode, a PC, an oscilloscope and a current probe. The drive control circuit transmits a triggering signal through the PC and is communicated with a single-chip microcomputer through a serial port module to control the corresponding on and off of the charging control switch and the discharging control switch so as to complete each ignition. The variable-energy ignition measuring and controlling system has the advantages that during each ignition, ignition energy magnitude of each ignition process can be measured accurately, an EC-EI curve can be acquired, and the ignition energy magnitude can be controlled by changing the energy accumulation size of the capacitor group.
Description
Technical field
The present invention relates to igniting TT&C system, refer to a kind of the igniting TT&C system and the investigating method thereof that become energy particularly.
Background technique
Ignition energy is one of important factor in order of engine performance, affects the catch fire forming process of core and the velocity of propagation of fuel incipient flame.Utilize engine pedestal can carry out about the research of different ignition energy for engine power performance, Economy and discharge, utilize constant volume combustion bomb system then can study the impact of different ignition energy for flame initial stage propagation process.Therefore the research carrying out ignition energy aspect just tool is of great significance, and can provide theoretical foundation for the design and control optimizing engine igniting system.
Minimum ignition energy refers to ignite finite concentration inflammable matter or the minimum energy value required for blast, and being used to the important parameter of the explosion hazard weighing inflammable gas or liquid vapour, is also the important parameter of electrostatic safety.Measure the minimum ignition energy of different fuel, both can provide reference for the safety in transportation and storage of inflammable gas or liquid, also can provide relevant parameter foundation for the ignition system design of motor.Therefore the minimum ignition energy measuring different fuel is significant.Utilize constant volume combustion bomb can measure the minimum ignition energy of different fuel (gaseous fuel and partially liq fuel).
At present in disclosed variable energy ignition system, major part is the change being controlled ignition energy by the parameter of control effect change energy qualitatively, such as, in inductance type ignition system, realizes becoming energy by controlling the duration of charge.Be similar to the size of demarcating ignition energy by means of fictitious load means, the ignition energy size obtaining igniting process each time in real time can not be accomplished.Due to load more complicated between electrode in discharge process, there is some difference with actual ignition energy to make the ignition energy size of demarcating.
The ignition system that conventional minimum ignition energy measuring device adopts is generally provide ten thousand volts of high pressure to capacitor charging, then by allowing capacitor discharge complete igniting by DC electrical source.Ignition energy then thinks the energy storage value of electric capacity.Although this ignition system structure is simple, because the output voltage of power supply is excessive, require higher for component pressure in circuit, reduce the working life of system, there is certain danger in operation.Simultaneously owing to there is line loss, actual ignition energy is made to be less than electric capacity stored energy value.
Summary of the invention
The object of the invention is overcome above-mentioned the deficiencies in the prior art and provide a kind of the igniting TT&C system and the investigating method thereof that become energy, this igniting TT&C system can realize the adjustable of ignition energy in igniting process and can survey, both can change ignition energy as required, and the ignition energy size of igniting process each time can be measured exactly.
Realizing the technological scheme that the object of the invention adopts is a kind of igniting TT&C system becoming energy, comprise charge circuit, discharge loop and control described charge circuit, Drive and Control Circuit, voltage probe, current probe, igniting polar, oscillograph and PC that discharge loop carries out charging and discharging;
Described charge circuit comprises: linear DC [constant, and is connected to the first diode, the first resistance, charging control switch, the second diode and the capacitance group between linear DC [constant positive pole and negative pole in turn;
Described discharge loop comprises described capacitance group, discharge control switch, spark coil and igniting polar, one end of described discharge control switch is connected with the negative electrode of the second diode, the other end is connected with one end of primary air in spark coil, and the two ends of igniting polar are connected with power cathode with the output terminal of secondary winding in spark coil respectively; The electrode that the test lead of described voltage probe is connected with secondary winding output terminal in spark coil connects, and earth wire clamp is connected with the other end of electrode; In current probe access electrode circuit, voltage probe is connected with oscillograph respectively with the collection output terminal of current probe, and oscillograph is connected with PC by datawire;
Described Drive and Control Circuit comprises 5V DC electrical source, 32V DC electrical source, photo coupler, SCM system, triode and reference diode, the positive pole of described 5V DC electrical source is through resistance R2, connect the positive pole of photo coupler in light emitting diode side, the negative pole of light emitting diode side is connected with the operational pin PX needed for SCM system; SCM system is connected with PC by serial port module; The emitter of the output terminal of photo coupler is connected with the negative pole of 32V DC electrical source, and collector electrode is then connected with resistance R4, is connected with the base stage of triode simultaneously; Be connected with the positive pole of 32V DC electrical source after resistance R3 connects with resistance R4, the emitter of triode is connected between resistance R4 and resistance R3, transistor collector is connected with any input end k1 of the electromagnetic coil in charging control switch and discharge control switch, and is connected with the negative pole of reference diode; Another input end of electromagnetic coil k2 is connected with the negative pole of 32V DC electrical source, and is connected with the positive pole of reference diode.
In technique scheme, the anode of described first diode D1 is connected with the positive pole of linear DC [constant 1, be connected between the negative electrode of the first diode D1 and the anode of the second diode D2 the first resistance R1 and charging control switch successively, the negative electrode of the second diode D2 is connected with one end of capacitance group, and the other end of capacitance group is connected with the negative pole of linear DC [constant.
In technique scheme, described linear DC [constant exports the voltage changed between 0 ~ 400V; Described capacitance group is formed by the Capacitance parallel connection of different capacitance, and each capacitances in series selector switch, in order in regulating circuit connect the capacitance of electric capacity, electric capacity used is polypropylene capactive, and selector switch used is mechanical switch.
As a kind of preferred implementation of the present invention, when the igniting TT&C system of described change energy is located on engine pedestal, described linear DC [constant comprises the boost rectifying circuit be connected with automobile storage battery, and for controlling the by-pass cock of turn ratio in boost rectifying circuit; Charging control section is divided and is comprised one-way SCR and the trigger circuit for controlling one-way SCR, and described trigger circuit are connected with Engine ECU; Described control of discharge part is the Drive and Control Circuit that solid-state relay and solid-state relay connect, and described Drive and Control Circuit is connected with Engine ECU.
As a kind of preferred implementation of the present invention, when the igniting TT&C system of described change energy is on constant volume combustion bomb experimental stand, described linear DC power supply is used for converting civil power to required VDC; Described charging control switch is the high-power magnetic relay be connected with Drive and Control Circuit with discharge control switch, and drive circuit is controlled by single-chip microcomputer, and single-chip microcomputer is connected with PC by serial ports.
In addition, the present invention also provides a kind of igniting TT&C system according to above-mentioned change energy to carry out the method for observing and controlling, and the method comprises the following steps:
(1) when PC sends fire signal, SCM system controls charging control switch 2 and closes a period of time, until complete the charging to capacitance group; Make the voltage at capacitance group two ends equal electric power output voltage, after capacitance group charging complete, charging control switch disconnects, discharge control switch closes, and capacitance group is discharged, and produces an instantaneous high pressure at secondary winding L2 output terminal, the interelectrode inflammable mixture of perforation ignition, completes igniting;
(2) in igniting process, voltage probe and current probe be collection point thermoelectricity voltage across poles and current signal respectively, and is imported in oscillograph, completes and shows the collection of Wave data and waveform;
(3), after PC receives oscillographic data by datawire, integral operation is carried out to the voltage on the electric discharge period and electric current, and then obtains this ignition energy value;
(4) time according to required ignition energy, the output voltage values of control linear [constant and the capacitance of capacitance group, thus realize controlling ignition energy.
Further, do integral and calculating, obtain ignition energy value to voltage interelectrode in discharge time and current data, the formula of ignition energy is:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, U is the magnitude of voltage between burn period, and I is the current value between burn period;
Signal due to oscillograph actual acquisition is the discrete point in a certain duration, and therefore above-mentioned formula is deformed into:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, u is the magnitude of voltage gathering each moment between burn period, and i is the current value gathering each moment between burn period, and Δ t is the oscillographic sample rate cycle;
By repetitive measurement, obtain the relation between the energy storage of electric capacity and ignition energy, and then can E be obtained
c-E
icurve, when a certain ignition energy of needs, according to E
c-E
icurve, the energy storage value of coarse adjustment electric capacity, makes ignition energy close to needing energy value; By the actual ignition energy value recorded, then the energy storage value of fine tuning electric capacity, thus make actual ignition energy approximation convergence be required ignition energy.
In technique scheme, in described step (1), the concrete steps of SCM system control charging control switch and discharge control switch are as follows:
PC sends fire signal to SCM system by serial ports, after SCM system receives this fire signal, and the potential change of the pin PX that finishes the work according to setting program; When operational pin PX becomes low potential from high petential, the light emitting diode of photo coupler is connected, make the triode saturation conduction of optocoupler internal output terminal, now the base stage of triode becomes low potential from high potential, by the resistance of build-out resistor R3 and R4, make triode saturation conduction, and make the voltage between electromagnetic coil two input ends equal its rated operational voltage, now electromagnetic relay adhesive, charging control switch or discharge control switch close; Otherwise when the operational pin PX of SCM system is high potential, photo coupler turns off, and triode ends, and makes the voltage between electromagnetic relay input end be 0, charging control switch or discharge control switch disconnect.
Working procedure of the present invention is as follows:
When charging control switch closes, complete the charging to capacitance group.After capacitance group charging complete, charging control switch disconnects, and discharge control switch closes, and now capacitance group, discharge control switch and spark coil form another loop.When discharge control switch closes, capacitance group completes electric discharge, and electric current flows through the primary air of spark coil, makes to produce an instantaneous high pressure on the secondary winding.Because one end of electrode is connected with the secondary winding output terminal of spark coil, one end is connected with power cathode, makes to produce instantaneous high pressure between electrode, the gas between breakdown electrode, thus completes igniting.
The present invention is in igniting process, voltage probe and current probe are used for gathering interelectrode voltage signal and current signal in igniting process respectively, and sent into data acquisition and waveform in oscillograph and show, again collect two Wave datas are imported in computer and complete correlation computations, calculate ignition energy value.
In addition, the present invention by changing the capacitance C of capacitance group in circuit and the size of the voltage U at the rear capacitance group two ends of charging, can also change the size of capacitance group energy storage.The present invention is in igniting process each time, and the size of ignition energy, can be realized by the energy storage size changing capacitance group.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the present invention becomes the igniting TT&C system of energy.
Fig. 2 is the Drive and Control Circuit figure of charge and discharge control switch.
Number in the figure is as follows:
1-linear DC power supply (A+ linear DC power supply positive pole A-linear DC power supply negative pole)
D1 diode
D2 diode
D3 reference diode
R1 resistance
R2 resistance
R3 resistance
R4 resistance
2 charging control switches
3 discharge control switches
4 spark coils
5 voltage probes
6 igniting polars
7 PCs
8 oscillographs
9 current probes
10 discharge loops
11 capacitance group
12 charge circuits
J1 selector switch
J2 selector switch
J3 selector switch
J4 selector switch
J5 selector switch
J10 selector switch
C1 electric capacity
C2 electric capacity
C3 electric capacity
C4 electric capacity
C5 electric capacity
C10 electric capacity
L1 primary air
L2 secondary winding
13 5V DC power anodes
14 32V DC power anodes
15 photo couplers
16 9012 type triodes
17 32V DC power cathodes
18 SCM systems (PX is single-chip microcomputer operational pin)
K1 electromagnetic coil input end
K2 electromagnetic coil input end
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the igniting TT&C system that the present invention becomes ignition energy comprises charge circuit 12 and discharge loop 10, wherein,
Charge circuit comprises linear DC [constant 1, and the first diode D1 be connected in turn between linear DC [constant 1 positive pole and negative pole, first resistance R1, charging control switch 2, second diode D2 and capacitance group 11, particularly, the anode of the first diode D1 is connected with the positive pole A+ of linear DC [constant 1, be connected between the negative electrode of the first diode D1 and the anode of the second diode D2 the first resistance R1 and charging control switch 2 successively, the negative electrode of the second diode D2 is connected with one end of capacitance group 11, the other end of capacitance group 11 is connected with the negative pole of linear DC [constant 1.
In the present embodiment, linear DC [constant 1 is export the voltage changed between 0 ~ 400V.Capacitance group 11 is by electric capacity (C1, C2, C3, C4, C5 of different capacitance ... C10) be formed in parallel, each capacitances in series selector switch (J1, J2, J3, J4, a J5 ... J10), in order in regulating circuit connect the capacitance of electric capacity, electric capacity used adopts polypropylene capactive (CBB electric capacity), selector switch adopts mechanical switch, can carry out manually-operable.
Discharge loop comprises capacitance group 11, discharge control switch 3, spark coil 4, voltage probe 5 and igniting polar 6, PC 7, oscillograph 8 and current probe 9, one end of discharge control switch 3 is connected with the negative electrode of the second diode D2, and the other end is connected with one end of primary air L1 in spark coil 4.The two ends of igniting polar 6 are connected with power cathode with the output terminal of secondary winding L2 in spark coil 4 respectively, and the test lead of voltage probe 5 connects with the electrode be connected with secondary winding output terminal, and earth wire clamp is connected with the other end.Current probe 9 accesses in electrode circuit, and voltage probe 5 and current probe 9 gather output terminal and be connected with oscillograph 8, and oscillograph 8 is connected with PC 7 by datawire.
The present invention's charging control switch 2 used and discharge control switch 3 are electromagnetic relay switch, adopt the Drive and Control Circuit shown in Fig. 2 to carry out open and close controlling.
In Drive and Control Circuit shown in Fig. 2,5V DC power anode 13 is through resistance R2, and connect photo coupler 15 at light emitting diode positive pole, the negative pole of light emitting diode is connected with the operational pin PX of SCM system 18.SCM system 18 is connected with PC 7 by serial port module.
The emitter of the output terminal of photo coupler 15 is connected with the negative pole 17 of 32V DC electrical source, and collector electrode is then connected with resistance R4, is connected with the base stage of 9012 type triodes 16 simultaneously.Be connected with the positive pole 14 of 32V DC electrical source after resistance R3 is connected with resistance R4, the emitter of 9012 type triodes 16 is connected between resistance R4 and resistance R3, and triode 16 collector electrode is connected with any input end k1 of electromagnetic coil, and be connected with the negative pole of reference diode D3.Another input end of electromagnetic coil k2 is connected with the negative pole 17 of 32V DC electrical source, and is connected with the positive pole of reference diode D3.The voltage stabilizing value of reference diode D3 is identical with relay coil rated operational voltage value.
The process that above-mentioned Drive and Control Circuit carries out open and close controlling to charging control switch 2 or discharge control switch 3 is as follows:
According to requirement of lighting a fire each time, PC 7 sends fire signal to SCM system 18 by serial ports, after SCM system 18 receives this fire signal, and the potential change of the pin PX that finishes the work according to setting program.When operational pin PX becomes low potential from high petential (+5V) (0V), the light emitting diode of photo coupler 15 is connected, make the triode saturation conduction of optocoupler internal output terminal, now the base stage of 9012 type triodes 16 becomes low potential from high potential, by the resistance of Proper Match resistance R3 and R4, make 9012 type triode 16 saturation conductions, and make the voltage between electromagnetic coil two input ends (between K1 and K2) equal its rated operational voltage, now electromagnetic relay adhesive, control switch closes.Otherwise when the operational pin PX of SCM system 18 is high potential, photo coupler 15 turns off, 9012 type triodes 16 end, and make the voltage between electromagnetic relay input end (between K1 and K2) be 0, and control switch disconnects.
When the present invention is applicable to engine pedestal, DC constant voltage power supply 1 can adopt by a boost rectifying circuit, battery voltage can be converted to a DC constant voltage to export, the turn ratio in booster circuit is controlled by by-pass cock, the magnitude of voltage realizing exporting changes within the specific limits, and by-pass cock can adopt mechanical switch.Charging control switch 2 can adopt one-way SCR, realizes silicon controlled conducting by trigger circuit, and after capacitance group 11 charging terminates, current over-zero realizes silicon controlled and automatically shuts down.According to the real work requirement of motor, trigger instants can be controlled by ECU, thus complete the charging of capacitance group 11 is controlled.Electric capacity can adopt the polypropylene capactive (CBB electric capacity) of different capacitance, forms capacitance group by parallel connection.Discharge control switch 3 can adopt solid-state relay, controls drive circuit realize the break-make of solid-state relay by ECU, thus completes capacitance group 11 and discharge, and realizes igniting in cylinder.When the present invention is applied to constant volume combustion bomb experimental stand, DC constant voltage source 1 can adopt the linear DC power supply of finished product, and the DC constant voltage that 220V (50Hz) Ac can be converted in certain limit exports.Charging control switch and discharge control switch can adopt the type identical with the charge and discharge control switch that adopts on motor, also can adopt high-power magnetic relay.In constant volume combustion bomb experimental stand, trigger signal can be sent by PC, realize the communication with single-chip microcomputer by serial ports, thus control charging control switch and the corresponding break-make of discharge control switch, complete and light a fire each time.
Capacitance group 11 of the present invention is formed by the Capacitance parallel connection of different capacitance, and each capacitances in series selector switch, the type of selector switch can adopt conventional machinery switch.Energy storage formula according to electric capacity:
Wherein: E
cboth end voltage after the capacitance U-capacitor charging of-capacitance energy storage C-electric capacity
Change the capacitance C of electric capacity and the voltage U at electric capacity two ends in circuit, thus the size of capacitance energy storage can be changed.The present invention is in igniting process each time, and the size of ignition energy, can be realized by the energy storage size changing capacitance group.When igniting tends towards stability, the energy storage of capacitance group is more, and the ignition energy in igniting is each time larger, otherwise, then less.The technical solution adopted in the present invention is under making system meet the prerequisite of stand requirement, ensures the duration of charge long enough of capacitance group, makes the voltage at capacitance group two ends equal supply voltage.Therefore the stored energy of capacitance group can be realized by the change output voltage values of high-voltage power and the capacitance of capacitance group.By closing or disconnecting corresponding selector switch, the capacitance change of capacitance group can be realized in the present invention.On the engine, the change of output HIGH voltage can realize by regulating the turn ratio of booster circuit in the present invention; In constant volume combustion bomb system, adopt linear DC power supply can realize the linear convergent rate of voltage in a certain scope.The present invention adopts spark coil to complete boosting igniting, reduces the requirement for DC constant voltage electric power output voltage.General output voltage is greater than 100V, can meet igniting requirement.
The present invention, in igniting process each time, by voltage probe 5 and current probe 6, gathers interelectrode voltage and current signal in discharge process.Voltage probe 5 can adopt high pressure passive probe, and its measuring end is connected with the output terminal of secondary winding, is connected by earth wire clamp with the electrode the other end.Current probe 6 accesses the loop that secondary winding and electrode are formed.Two probe acquires output terminals are connected with oscillograph, by datawire, oscillograph 8 and PC 7 is connected.Each time in igniting process, voltage and current signal between acquisition electrode, waveform is presented by oscillograph, and import voltage and current signal into computer gathering in duration data over time, by doing integral and calculating to voltage interelectrode in discharge time and current data, obtain ignition energy value.The formula of ignition energy is:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, U is the magnitude of voltage between burn period, and I is the current value between burn period;
Signal due to oscillograph actual acquisition is the discrete point in a certain duration, and therefore above-mentioned formula can be modified to:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, u is the magnitude of voltage gathering each moment between burn period, and i is the current value gathering each moment between burn period, and Δ t is the oscillographic sample rate cycle;
After repetitive measurement, obtain the relation between the energy storage of electric capacity and ignition energy, and then obtain E
c-E
icurve, completes demarcation of the present invention.When a certain ignition energy of needs, according to E
c-E
icurve, can the energy storage value of coarse adjustment electric capacity, makes ignition energy close to desired value.By the actual ignition energy value recorded, then the energy storage value of fine tuning electric capacity, thus make actual ignition energy approximation convergence be required ignition energy.Both can realize becoming energy igniting by technique scheme, also can regulate the size of ignition energy on demand, and then for measuring the minimum ignition energy of fuel.
The working procedure of the igniting TT&C system of the variable ignition energy of the present invention is as follows:
By writing control program, realizing Single-chip Controlling and completing following process: when PC 7 sends fire signal, SCM system 18 performs corresponding program, realize charging control switch 2 and close a period of time, complete the charging to capacitance group 11.After capacitance group 11 charging complete, charging control switch 2 disconnects, and discharge control switch 3 closes, and capacitance group 11 completes electric discharge, and produces an instantaneous high pressure at secondary winding L2 output terminal, and the inflammable mixture between perforation ignition electrode 6, completes igniting.
Each time in igniting process, voltage probe 5 and current probe 9 gather the analogue signal of voltage and electric current between igniting polar 6 respectively, and are imported in oscillograph 8, complete and show the collection of Wave data and waveform.Import the data that oscillograph 8 stores into PC 7 by datawire, PC 7 carries out integral operation to the voltage on the electric discharge period and electric current, and then obtains this ignition energy value.According to gathering the needs of waveform, regulating the display amplitude range of the longitudinal form of oscillograph 8 and length writing time of horizontal form, ensureing the complete of image data each time.
As a kind of preferred implementation of the present invention, before igniting each time, the voltage in linear adjustment DC constant voltage source 1 can be coordinated to export the capacitance with capacitance group 11, realize the change of capacitance group energy storage.The voltage-regulation of linear DC [constant 1 can adopt its adjusting knob carried to carry out linearly adjust, and the capacitance of capacitance group 11 can pass through selector switch (J1, J2, J3, J4, J5 ... J10) opening and closing adjusts.When only having the first selector switch J1 and the second selector switch J2 closes, the capacitor's capacity in circuit is the capacitance sum of the first electric capacity C1 and the second electric capacity C2.By that analogy, can as requested, the selector switch of closed corresponding capacitance, thus the capacitance size of electric capacity in control circuit.When needing higher point fire energy, the output voltage values of linear [constant 1 and the capacitance of capacitance group 11 can be increased, improve the energy storage value of electric capacity, thus realize ignition energy rising.Each time in igniting process, by control capacittance energy storage value, realize the change of ignition energy, according to Real-time Collection and the size of ignition energy calculated, and then can be implemented on constant volume combustion bomb stand and study the impact of ignition energy on combustion characteristic.
The energy storage of electric capacity controls at a certain steady state value, and by repeatedly lighting a fire, ignition energy can be tending towards in a certain stability range, and then can complete a demarcation to this ignition system, obtains the energy storage of electric capacity and the variation relation of ignition energy.By this relation curve, can the energy storage size of coarse adjustment electric capacity as required, and the ignition energy value by calculating in real time, the energy storage size of fine tuning electric capacity, thus make ignition energy be tending towards required energy value, constant volume combustion bomb stand can be utilized to measure the minimum ignition energy of fuel.
Draw through experiment: the output voltage of linear adjustment [constant 1 is 100V, and the capacitance of capacitance group 11 is 0.978uF, after repeatedly lighting a fire and measuring, the size calculating ignition energy is tending towards 2.3mJ.The output voltage of linear adjustment [constant 1 is 200V, and the capacitance of capacitance group 11 is 0.978uF, and after repeatedly lighting a fire and measuring, the size calculating ignition energy is tending towards 7.4mJ.The output voltage of linear adjustment [constant 1 is 300V, and the capacitance of capacitance group 11 is 0.978uF, and after repeatedly lighting a fire and measuring, the size calculating ignition energy is tending towards 15.6mJ.The output voltage of linear adjustment [constant 1 is 400V, and the capacitance of capacitance group 11 is 0.978uF, and after repeatedly lighting a fire and measuring, the size calculating ignition energy is tending towards 25.5mJ.Draw thus, by changing capacitance energy storage value size, the adjustment of ignition energy can be realized, and be tending towards some particular values at specific capacitance energy storage value down-firing energy.
Claims (8)
1. become an igniting TT&C system for energy, it is characterized in that: comprise charge circuit, discharge loop and control described charge circuit, Drive and Control Circuit, voltage probe, current probe, igniting polar, oscillograph and PC that discharge loop carries out charging and discharging;
Described charge circuit comprises: linear DC [constant, and is connected to the first diode, the first resistance, charging control switch, the second diode and the capacitance group between linear DC [constant positive pole and negative pole in turn;
Described discharge loop comprises described capacitance group, discharge control switch, spark coil and igniting polar, one end of described discharge control switch is connected with the negative electrode of the second diode, the other end is connected with one end of primary air in spark coil, and the two ends of igniting polar are connected with power cathode with the output terminal of secondary winding in spark coil respectively; The electrode that the test lead of described voltage probe is connected with secondary winding output terminal in spark coil connects, and earth wire clamp is connected with the other end of electrode; In current probe access electrode circuit, voltage probe is connected with oscillograph respectively with the collection output terminal of current probe, and oscillograph is connected with PC by datawire;
Described Drive and Control Circuit comprises 5V DC electrical source, 32V DC electrical source, photo coupler, SCM system, triode and reference diode, the positive pole of described 5V DC electrical source is through resistance R2, connect the positive pole of photo coupler in light emitting diode side, the negative pole of light emitting diode side is connected with the operational pin PX needed for SCM system; SCM system is connected with PC by serial port module; The emitter of the output terminal of photo coupler is connected with the negative pole of 32V DC electrical source, and collector electrode is then connected with resistance R4, is connected with the base stage of triode simultaneously; Be connected with the positive pole of 32V DC electrical source after resistance R3 connects with resistance R4, the emitter of triode is connected between resistance R4 and resistance R3, transistor collector is connected with any input end k1 of the electromagnetic coil in charging control switch and discharge control switch, and is connected with the negative pole of reference diode; Another input end of electromagnetic coil k2 is connected with the negative pole of 32V DC electrical source, and is connected with the positive pole of reference diode.
2. become the igniting TT&C system of energy according to claim 1, it is characterized in that: the anode of described first diode D1 is connected with the positive pole of linear DC [constant 1, be connected between the negative electrode of the first diode D1 and the anode of the second diode D2 the first resistance R1 and charging control switch successively, the negative electrode of the second diode D2 is connected with one end of capacitance group, and the other end of capacitance group is connected with the negative pole of linear DC [constant.
3. become the igniting TT&C system of energy according to claim 1, it is characterized in that: described linear DC [constant exports the voltage changed between 0 ~ 400V; Described capacitance group is formed by the Capacitance parallel connection of different capacitance, and each capacitances in series selector switch, in order in regulating circuit connect the capacitance of electric capacity, electric capacity used is polypropylene capactive, and selector switch used is mechanical switch.
4. according to any one of claims 1 to 3, become the igniting TT&C system of energy, it is characterized in that: when described igniting TT&C system is located on engine pedestal, described linear DC [constant comprises the boost rectifying circuit be connected with automobile storage battery, and for controlling the by-pass cock of turn ratio in boost rectifying circuit; Charging control section is divided and is comprised one-way SCR and the trigger circuit for controlling one-way SCR, and described trigger circuit are connected with Engine ECU; Described control of discharge part is the Drive and Control Circuit that solid-state relay and solid-state relay connect, and described Drive and Control Circuit is connected with Engine ECU.
5. according to any one of claims 1 to 3, become the igniting TT&C system of energy, it is characterized in that: when described igniting TT&C system is on constant volume combustion bomb experimental stand, described linear DC power supply is used for converting civil power to required VDC; Described charging control switch is the high-power magnetic relay be connected with Drive and Control Circuit with discharge control switch, and drive circuit is controlled by single-chip microcomputer, and single-chip microcomputer is connected with PC by serial ports.
6. become an investigating method for the igniting TT&C system of energy according to claim 1, it is characterized in that comprising the following steps:
(1) when PC sends fire signal, SCM system controls charging control switch 2 and closes a period of time, until complete the charging to capacitance group; Make the voltage at capacitance group two ends equal electric power output voltage, after capacitance group charging complete, charging control switch disconnects, discharge control switch closes, and capacitance group is discharged, and produces an instantaneous high pressure at secondary winding L2 output terminal, the interelectrode inflammable mixture of perforation ignition, completes igniting;
(2) in igniting process, voltage probe and current probe be collection point thermoelectricity voltage across poles and current signal respectively, and is imported in oscillograph, completes and shows the collection of Wave data and waveform;
(3), after PC receives oscillographic data by datawire, integral operation is carried out to the voltage on the electric discharge period and electric current, and then obtains this ignition energy value;
(4) time according to required ignition energy, the output voltage values of control linear [constant and the capacitance of capacitance group, thus realize controlling ignition energy.
7. become the investigating method of the igniting TT&C system of energy according to claim 6, it is characterized in that:
Do integral and calculating to voltage interelectrode in discharge time and current data, obtain ignition energy value, the formula of ignition energy is:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, U is the magnitude of voltage between burn period, and I is the current value between burn period;
Signal due to oscillograph actual acquisition is the discrete point in a certain duration, and therefore above-mentioned formula is deformed into:
In formula: E
ifor ignition energy, t
1for the moment that igniting starts, t
2for the moment that igniting terminates, u is the magnitude of voltage gathering each moment between burn period, and i is the current value gathering each moment between burn period, and Δ t is the oscillographic sample rate cycle;
By repetitive measurement, obtain the relation between the energy storage of electric capacity and ignition energy, and then can E be obtained
c-E
icurve, when a certain ignition energy of needs, according to E
c-E
icurve, the energy storage value of coarse adjustment electric capacity, makes ignition energy close to needing energy value; By the actual ignition energy value recorded, then the energy storage value of fine tuning electric capacity, thus make actual ignition energy approximation convergence be required ignition energy.
8. according to claim 6 or 7, become the investigating method of the igniting TT&C system of energy, it is characterized in that the concrete steps of SCM system control charging control switch and discharge control switch in described step (1) are as follows:
PC sends fire signal to SCM system by serial ports, after SCM system receives this fire signal, and the potential change of the pin PX that finishes the work according to setting program; When operational pin PX becomes low potential from high petential, the light emitting diode of photo coupler is connected, make the triode saturation conduction of optocoupler internal output terminal, now the base stage of triode becomes low potential from high potential, by the resistance of build-out resistor R3 and R4, make triode saturation conduction, and make the voltage between electromagnetic coil two input ends equal its rated operational voltage, now electromagnetic relay adhesive, charging control switch or discharge control switch close; Otherwise when the operational pin PX of SCM system is high potential, photo coupler turns off, and triode ends, and makes the voltage between electromagnetic relay input end be 0, charging control switch or discharge control switch disconnect.
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| WO2017084480A1 (en) * | 2015-11-18 | 2017-05-26 | 联合汽车电子有限公司 | Ignition system having high-voltage voltage-stabilized energy storage device |
| CN107192735A (en) * | 2017-06-12 | 2017-09-22 | 公安部天津消防研究所 | A kind of adjustable extrahigh energy diffusion ignition energy generating means and control method |
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