CN105179135B

CN105179135B - A kind of closed loop control method of low-voltage direct CDI igniters

Info

Publication number: CN105179135B
Application number: CN201510509355.8A
Authority: CN
Inventors: 欧阳小录
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-18
Filing date: 2015-08-18
Publication date: 2017-11-28
Anticipated expiration: 2035-08-18
Also published as: CN105179135A

Abstract

The present invention relates to a kind of closed loop control method of low-voltage direct CDI (Loop locked CDI, LLCDI) igniter, including step：1：2 points or multiple spot boosting detection circuit, i.e., minimum igniting energy voltage point and highest stop voltage point are set；2：Measure boosts to the time Td of highest limit point voltage when upper electric, loads appropriate duty cycle parameters accordingly；3：Boost charge voltage is determined from zero (after last time igniting triggering) to the time Tp of minimum igniting energy voltage point time Ea points, 4：According to the Tp measured compared with the standard Ts set, and the corresponding adjustment of dutycycle one (or multiple) dutycycle step pitch of progress to boost signal；5：Triggering electric discharge, booster circuit start again at work；Iteration performs step 3,4,5, until untill boosting curve and predetermined boosting curve co-insides degree highest after adjustment, Tp and Ts error minimum.The present invention improves the integrated level and effect of direct current CDI igniters by a series of above-mentioned closed loop control methods.

Description

A kind of closed loop control method of low-voltage direct CDI igniters

Technical field

The present invention relates to a kind of closed loop control method of low-voltage direct CDI igniters.

Background technology

At present, low-voltage direct boost type igniter is widely used in fields such as small-sized aerial craft, model engines, such as Using the put-put CDI igniters of battery booster sparking mode, its operation principle is by low pressure by secondary booster technology DC power conversion is the high-tension ignition electric current of tens thousand of volts, and boosting (primary boosting) for the first time is by low-voltage direct by oscillating circuit Electricity is converted to about 260~400V primary high pressure, and energy storage capacitor is charged, and then this electric capacity is discharged by controllable silicon high voltage package, It is converted to tens thousand of volts of high-tension electricity, form second and boost, the compressing inflammable gas of cylinder is discharged, so as to promote work Plug acting.

Under current design method, general DC low-voltage igniter all exist it is relatively-stationary use voltage range, such as The CDI igniters of certain model, its normal working voltage scope are only 4.8 between 8.4V, and the super CDI that goes beyond the scope can not Normal work, otherwise the power for the boost charge for causing igniter is excessive, otherwise it is too small, and be possible to damage, the scope of application It is very narrow.

So, very big inconvenience is just caused to user, it is necessary to power type is carefully selected, such as, 4 section ni-mh electricity Pond, or 2 section lithium batteries, if with 3 section lithium batteries, or during 3 section Ni-MH battery igniter be respectively possible damage and not work Make.

Such as the primary boosting part of CDI igniters of certain model, as shown in Figure 1, 2, it can be seen that its oscillating part be by NE555 is formed, with elements such as signal the driving FET F1, transformer T1, rectifying tube D4 of a fixed duty cycle by power supply Boost in voltage is about 300 volts of primary voltage.

The primary boosting curve of general such a working method is as shown in Figure 2：(Fig. 3 A points voltage curve)

From Fig. 3 it will be seen that under a variety of supply voltages, the difference of primary boosting curve,

It is 5V in supply voltage, in the case of 9V, 4V, 3 primary boosting curves obtaining respectively are OA, OB, OC, can be with See that OB time is most short, OA time is placed in the middle, and OC time is most long, because under the conditions of same circuit parameter, OB Supply voltage highest, OC supply voltage is minimum.

Assuming that OA sections are optimal engine matching boosting curve, i.e., under the operating mode of startup or idling, the charging of igniter Accumulation of energy has highest energy, it is assumed that certain point on boosting curve OA, charged energy meet smallest point during high engine speeds Fiery energy requirement, Ea being designated as, corresponding pressure rising time is Ta on OA curves, and in OB, OC curves, it is intended to reach same charging Energy, its charging interval is then Tb, Tc, from Fig. 3 we can see that Tc>Ta>Tb, Eb, Ec be the Ta times under OB, OC curves institute The energy reached, Erdy are the final limitation charging voltage of primary of low-speed conditions down-firing device.

Further analysis, if it will be seen that take no action to, under the Ta times, OB curves (under 9V voltages) institute Obtain energy and exceed minimum engine ignition energy requirement Ea, and the energy that OC curves (4V) are obtained is less than engine most Small igniting ENERGY E a, that is to say, that external parameter condition one changes, and the boosting curve of igniter changes therewith, it is impossible to full The working condition requirement of sufficient engine.

But it is recognised that under certain voltage conditions, the duty of the drive signal of igniter is compared to adjust by we Whole, the primary boosting curve of (i.e. FET F1 driving in figure one) igniter is the adjustment that charging rate can be achieved, when accounting for When sky is than increasing, charging curve steepening, when dutycycle reduces, charging curve will slow down, as shown in Figure 4.

The content of the invention

The technical problems to be solved by the invention are to provide a kind of profile parameters and boosted switch power supply by the curve that boosts The duty cycle parameters closed loop of driving pwm signal connect, you can meet the working characteristicses requirement of engine, realize igniter Full voltage range work low-voltage direct CDI igniters closed loop control method and system.

The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of closed-loop control of low-voltage direct CDI igniters Method, specifically include following steps：

1：2 points or multipoint voltage detection circuit are set, i.e., minimum igniting energy voltage point and highest limit boost point；

2：The upper electrometric determination Td times, obtained preliminary dutycycle boosting parameter.

3：Last time igniting after, measure charging voltage from zero to it is minimum igniting energy voltage point time Ea points time Tp, when CPU detects that booster circuit ends when booster voltage reaches Erdy points；

4：According to the Tp measured compared with the standard Ts set, and one is carried out to the dutycycle of boost drive signals The adjustment of (or multiple) dutycycle step pitch；

5：Triggering electric discharge, booster circuit start again at work；

Iteration execution step 3,4,5, until the boosting curve of drive signal and making a reservation for for default pressure rising time after adjustment Untill boosting curve co-insides degree highest, Tp and Ts error minimum.

The beneficial effects of the invention are as follows：By a series of above-mentioned closed loop control methods, Traditional DC CDI igniters are improved Adaptability, flexibility, reliability etc., and reduce the cost of software and hardware, improve the integrated level and effect of CDI igniters, And may for the offer of promoting the use of of direct current CDI igniters.

The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of closed-loop control system of low-voltage direct CDI igniting System, including system hardware and the most of composition of system software two,

The hardware system is by master cpu (P89LPC901), and PWM booster driving circuits, 2 electrical voltage points detect circuit, bent The part such as handle Hall sensor circuit, igniting triggers circuit is formed, and is the carrier and hardware platform of the control software of system.

The software systems primary method of control is：

Boost PWM signal is exported, perceives and controls maximum restriction booster voltage, perception boosts to minimum energy point voltage institute Time Tp is expended, and rational boosting curve is realized in control in accordance with the previously described process, and engine crank is perceived according to hall signal Position, in appropriate time of ignition output igniting trigger pulse so that engine high-efficiency stably works.

Brief description of the drawings

The circuit diagram of Fig. 1 primary boosting parts of CDI igniters of certain model in the prior art；

Fig. 2 is Fig. 1 sample point A oscillogram；

Primary boosting curve synoptic diagram under a variety of supply voltages of Fig. 3；

Relation schematic diagram between Fig. 4 dutycycles and boosting curve；

Fig. 5 is a kind of closed loop control method flow chart of low-voltage direct CDI igniters of the present invention；

Fig. 6 is a kind of closed loop control method flow chart of low-voltage direct CDI igniters described in specific example of the present invention；

Fig. 7 is a kind of closed-loop control system structured flowchart of igniter described in specific example of the present invention；

Fig. 8 is Fig. 7 sample point A oscillogram；

Fig. 9 is the circuit diagram of the specific embodiment of the invention.

Embodiment

The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and It is non-to be used to limit the scope of the present invention.

It is a kind of low-voltage direct CDI of the present invention as shown in figure 5, as shown in Fig. 5 (product example IGD0414) The closed loop control method of (Loop locked CDI, LLCDI) igniter, specifically includes following steps：

Step 1：Upper electricity, CPU measure Td times obtain preliminary duty cycle parameters；

Step 2：Energy storage capacitor (C3) is determined to start working to the time Tp of minimum energy point voltage, boosting from booster circuit Circuit works on reaches highest limit point voltage until perceiving its voltage；

Step 3：CPU compared with the predetermined standard Ts times, was adjusted according to its result and risen according to the Tp times measured The dutycycle of pwm signal is pressed, then waits the arrival of ignition signal next time；

Step 4：CPU outputs ignition trigger signals, the voltage of energy storage capacitor (C3) are reduced to zero or so suitable at the time of, so Booster circuit starts again at work afterwards；

Iteration execution step 2,3,4, until the boosting curve of drive signal and making a reservation for for default pressure rising time after adjustment Boost curve co-insides, untill Tp and Ts error minimum；

As shown in fig. 6, be a kind of closed-loop control system of igniter of the present invention, including hardware and software two Point；

The hardware system is by master cpu (Fig. 7 U1：P89LPC901, Fig. 8 are Fig. 7 sample point A oscillogram), PWM booster driving circuits：It is made up of F1, Q2, Q4 etc., 2 electrical voltage points detect circuit：It is made up of Q3, Q5 etc., crank hall sensing Device circuit：Be made up of Q1 etc., igniting triggers circuit (pin of U1 the 5th) etc. part is formed, be system control software carrier with it is hard Part platform, Fig. 9 are the primary boosting curve synoptic diagram of adjustment of specific embodiment.

Software section, this close-loop control mode, which specifically describes, is：

1：According to the detection of 2 booster voltage test points, Fig. 7 triode Q5, triode Q3 loops are seen：By triode Q5 Highest boosting limitation voltage is detected, triode Q3 detects predetermined minimum igniting energy point voltage, such as 140V.

2：System starts timing after the power-up, until perceiving the effective low levels of Q5, so as to measure the Td times, tables look-up acquisition just The boosting duty cycle parameters of step.

3：Start timing after the completion of last time igniting, until perceiving the effective low levels of Q3, this time is the Tp times, Ta, Tb or Tc namely as shown in Figure 3.

4：According to the Tp times measured and standard setting pressure rising time Ts comparative result to booster circuit drive signal Dutycycle is adjusted, and increases or reduce one or several PWM duty cycle step pitches；

(Tp is the time for boosting to minimum point energy point in Fig. 3, that is, Ta or Tb or Tc, Ts are in figure as shown in Figure 3 This default parameter and standard time in software, Tb is the time for boosting to highest stop voltage point, when being mainly used in upper electric Dutycycle coarse adjustment), Ta is the time (boosting to the time of minimum energy point voltage, that is, Ts) of standard, i.e., in control software Default constant, Tb time is too short in Fig. 3 example, and boost power is excessive, and Tc overlong time, boost power is too small,

CPU control measure：In the case of Tb, reduce one (or several) step pitch of dutycycle, that is, reduce boost power, Boosting curve slows down, and in the case of Tc, increases one (or several) step pitch of dutycycle, that is, increases boost power, and boost curve Steepening, as shown in Figure 4.

5：Booster circuit acts at once after this igniting, you can is recycled to step 3, can measure dutycycle tune again Pressure rising time after whole, adjust dutycycle again respectively, boosting curve can be adjusted to by the general adjustment by within 10 times Preferable OA shapes.

The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims

A kind of 1. closed loop control method of low-voltage direct CDI igniters, it is characterised in that following steps：

Step 1：Booster voltage is set to detect feedback circuit, for detecting the minimum igniting energy voltage point and highest of booster circuit Limit two or more voltage detecting points of boost point；

Step 2：Upper electricity, the Td times are determined, coarse adjustment boosting duty cycle parameters are obtained with means of tabling look-up；

Step 3：After the last electric discharge of start-up operation, measure booster circuit is charged to minimum igniting from starting working to energy storage capacitor The time of energy voltage point, obtain the elapsed time Tp that boosts；

Step 4：Elapsed time Tp will be boosted compared with the standard time Ts set, boosting is adjusted according to comparative result The dutycycle of drive signal；

Step 5：Triggering electric discharge, booster voltage detection circuit is stopped during electric discharge, and booster voltage detects circuit after the completion of electric discharge Restart work；

Step 6：Iteration performs step 3-5, until the difference of standard time of the boosting elapsed time after adjustment with setting is less than Setting value.
2. the closed loop control method of a kind of low-voltage direct CDI igniters according to claim 1, it is characterised in that described Step 5 specifically includes following steps：

Step 5.1：Ignition trigger signals, triggering igniting are received, energy storage capacitor starts to discharge；

Step 5.2：Energy storage capacitor electric discharge terminates, and measure voltage detecting circuit restarts work.
A kind of 3. closed loop control method of low-voltage direct CDI igniters according to claim 1 or 2, it is characterised in that institute State and use the preliminary duty cycle parameters obtained according to the Td times to drive booster circuit in step 2.
4. the closed loop control method of a kind of low-voltage direct CDI igniters according to claim 1, it is characterised in that described When the boosting elapsed time and the difference minimum of the standard time of setting of the drive signal after adjustment, the driving letter after the adjustment Number boosting curve and default pressure rising time predetermined boosting curve co-insides degree highest.