CN102278220A - Novel free-wheeling circuit for electronically controlled injector of diesel engine - Google Patents
Novel free-wheeling circuit for electronically controlled injector of diesel engine Download PDFInfo
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- CN102278220A CN102278220A CN2011101835762A CN201110183576A CN102278220A CN 102278220 A CN102278220 A CN 102278220A CN 2011101835762 A CN2011101835762 A CN 2011101835762A CN 201110183576 A CN201110183576 A CN 201110183576A CN 102278220 A CN102278220 A CN 102278220A
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Abstract
The invention discloses a novel free-wheeling circuit for an electronically controlled injector of a diesel engine. The free-wheeling circuit comprises a low side driven metal oxide semiconductor (MOS) transistor. The source of the low side driven MOS transistor is grounded, and the drain of the low side driven MOS transistor is connected with one end of the injector. The other end of the injector is connected with the source of a high side driven MOS transistor by a free-wheeling diode, and is also grounded by an ultra-fast recovery diode. The drain of the high side driven MOS transistor is connected with a VCC power supply. The drain of the low side driven MOS transistor is also connected with the VCC power supply by the free-wheeling diode. The two ends of the injector are grounded by a capacitor respectively. The self-induced electromotive force of the injector may not produce undershoot at a high end to destroy a driving chip of the high side driven MOS transistor, and simultaneously may not produce overshoot exceeding VCC to destroy the low side driven MOS transistor. The conversion characteristics of the free-wheeling circuit may not be influenced by the two diodes, and the safety of the free-wheeling circuit is improved. Therefore, the free-wheeling circuit achieves ideal control accuracy at the same time of ensuring the safety and reliability.
Description
Technical field
The present invention relates to a kind of freewheeling circuit.Particularly relate to the dynamo-electric control of the succinct novel diesel reliably of a kind of circuit structure oil sprayer freewheeling circuit.
Background technique
The diesel engine electric-controlled oil ejector control circuit is an executive circuit of directly controlling oil sprayer work, is one of core of electronic diesel control ECU.Its fundamental function is the open and close of control oil sprayer, the decision fuel injection characteristic.But different circuit structures can influence the rise and fall speed of oil sprayer power on/off electric current, and the rate of change of electric current will determine that (all there is uncontrollable time factor in these two periods for speed that oil sprayer opens and cut out, this uncontrollable time period is short more good more), and oil sprayer keeps the stability of period (oil sprayer is opened fully to end of injection).So control circuit will directly determine the control accuracy of fuel injection quantity and injection timing, if the rate of change of electric current is fast, then the oil sprayer open and close time lacks, and control accuracy is just high.
When oil sprayer type fixedly the time, the power supply voltage decision of the speed that electric current rises during by energising.Voltage is big more, and it is fast more to rise.At this moment driving type is divided into two kinds of single supply and double-power sourcies.When single supply drove, this voltage was determined by maximum withstand voltage or the normal voltage that the oil sprayer manufacturer provides.When double-power source drove, booster tension (oil sprayer is opened the period) was consistent with single supply driving voltage choosing method, and sustaining voltage (oil sprayer is opened fully) should be not less than the minimum voltage that the artificer provides, and less than driving voltage.
Freewheeling circuit is a diesel injector control circuit most important component, the lowering speed of electric current during its decision oil sprayer outage.Always The faster the better for the electric current lowering speed of different periods in injection process, the different periods, expects different electric current lowering speeds.As shown in Figure 1, the period one (a), oil sprayer is opened fully, and it is big that the oil sprayer inductance becomes, and only needs less current just can continue to open, and too high electric current can generate heat and burn oil sprayer.This moment, the lowering speed of electric current should be tried one's best slowly, otherwise the oil sprayer electromagnetic coil can produce high self induction electromotive force and burn metal-oxide-semiconductor or other chips.Period two (b), the oil sprayer electric current has dropped to a desired value, need remain on an OK range and make oil spout continue to open.Wish that current fluctuation is little this moment, and change is slow, so the electric current lowering speed is the smaller the better.Period three (c), injection process finishes, and oil sprayer begins to cut out, and wish the electric current lowering speed this moment, and The faster the better, and oil sprayer cuts out rapidly, to improve control accuracy.So optimal oil sprayer freewheeling circuit should be extremely slow at lowering speed in period one and period two, lowering speed is exceedingly fast in the period three.
Fig. 2 a, Fig. 2 b are the pattern of two kinds of limit in the freewheeling circuit, and these two kinds of circuit only are present in experiment and the theory analysis.Fig. 2 a circuit is the slowest a kind of freewheeling circuit of interruption current decline, and sort circuit is optimal to the period one with the period two, and long owing to downslope time to the period three, the control accuracy extreme difference is so sort circuit can not be applied to real system.Fig. 2 b circuit is the fastest a kind of freewheeling circuit of electric current lowering speed, and the shortest to periods three downslope time, control accuracy is the highest.But self induction electromotive force is high in period one or periods three electric current decline, impact several times and will smash metal-oxide-semiconductor or other chips (main harm that self induction electromotive force produces is, smash flash metal-oxide-semiconductor driving chip in the negative greatly overshoot of the high-end generation of oil sprayer, perhaps produce greatly positive overshoot and smash low limit metal-oxide-semiconductor at the oil sprayer low side.These two kinds of phenomenons all can not occur); Because electric current decline is too fast, can not guarantee to keep current stabilization in the period two, oil sprayer can not continue to open.Sort circuit does not have safety reliability, can not be applied to real system.
Fig. 2 c circuit is nowadays the most general freewheeling circuit.Be exactly in fact in Fig. 2 a circuit diode branch increase a resistance, the lowering speed that will make electric current like this than Fig. 2 b more slowly, obtains certain control accuracy than Fig. 2 a hurry up on the basis that guarantees sufficiently high safety and stablization.It mainly is the coupling of resistance that Fig. 2 c circuit is made a search.Resistance increases, and electric current descends fast, and control accuracy improves, and security and stability reduces; Resistance reduces, and electric current descends slow, and security and stability improves, and control accuracy reduces.Control accuracy is the highest when Fig. 2 c circuit resistance is infinity, but does not have Security, and this moment, Fig. 2 c circuit and Fig. 2 b circuit were in full accord.So the compromise of Fig. 2 c circuit diagram 2a circuit and Fig. 2 b circuit is not optimum mode, reliability is poorer than Fig. 2 a circuit, and control accuracy is poorer than Fig. 2 b circuit.On the basis of Fig. 2 c circuit, develop out a lot of freewheeling circuits again, as Fig. 2 d (D1 is a Transient Suppression Diode among the figure), Fig. 2 e, Fig. 2 f (D1 is a Transient Suppression Diode among the figure) circuit, can learn by brief analysis, these circuit are the same with Fig. 2 c circuit all to be the scheme of compromise, can not the desirable best mode of oil sprayer freewheeling circuit all satisfying safety and obtaining the highest precision under the situation reliably.
Summary of the invention
Technical problem to be solved by this invention is that a kind of dynamo-electric control of novel diesel oil sprayer freewheeling circuit that can obtain the highest control accuracy under sufficiently high safety and reliability prerequisite is provided.
The technical solution adopted in the present invention is: the dynamo-electric control of a kind of novel diesel oil sprayer freewheeling circuit, include low limit driven MOS pipe, the source ground of described low limit driven MOS pipe, drain electrode connects an end of oil sprayer, the other end of described oil sprayer connects the source electrode of flash driven MOS pipe by a fly-wheel diode, this end of oil sprayer is also by a Ultrafast recovery diode ground connection, the drain electrode of described flash driven MOS pipe connects the VCC power supply, and the drain electrode of described low limit driven MOS pipe also connects the VCC power supply by a fly-wheel diode.
The two ends of described oil sprayer are respectively by a capacity earth.
The dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit, oil sprayer high-end with ground between is connected a reverse Ultrafast recovery diode, the oil sprayer self induction electromotive force can not born overshoot and the driving chip that smash the flash metal-oxide-semiconductor in high-end generation; Simultaneously the oil sprayer low side is connected an afterflow diode with VCC, does not ruin and hangs down the limit metal-oxide-semiconductor so self induction electromotive force can not produce above the positive overbump of VCC.And the transfer characteristic of freewheeling circuit is not influenced by above-mentioned two diodes can, and the freewheeling circuit Security also is improved.Therefore, the present invention's control accuracy when guaranteeing safety reliability also reaches desirable requirement.
Description of drawings
Electric current changed conditional curve figure when Fig. 1 was the oil sprayer oil spout of prior art;
What Fig. 2 a～Fig. 2 f represented is different oil sprayer freewheeling circuit schematic diagrams;
Fig. 3 is a novel oil sprayer freewheeling circuit schematic diagram of the present invention;
Fig. 4 is the change trend curve figure of freewheeling circuit oil spout electric current of the present invention.
Wherein:
A, a ': period one b, b ' that electric current descends: the period two that electric current descends
C, c ': periods three L that electric current descends: oil sprayer
Embodiment
Below in conjunction with embodiment and accompanying drawing the dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit is made a detailed description.
As shown in Figure 3, the dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit, include low limit driven MOS pipe Q2, the source ground of described low limit driven MOS pipe Q2, drain electrode connects the end of oil sprayer L, the other end of described oil sprayer L connects the source electrode of flash driven MOS pipe Q1 by a sustained diode 2, this end of oil sprayer L is also by a Ultrafast recovery diode D1 ground connection, the drain electrode of described flash driven MOS pipe Q1 connects the VCC power supply, and the drain electrode of described low limit driven MOS pipe Q2 also connects the VCC power supply by a sustained diode 3.The two ends of described oil sprayer L are respectively by a capacitor C 1, C2 ground connection.
The dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit, wherein VCC selects the driving voltage that the oil sprayer manufacturer provides for use; Flash driven MOS pipe Q1 is that flash drives type, uses the flash bootstrap to drive; Low limit driven MOS pipe Q2 uses common low limit driving chip to drive for low limit drives type; Ultrafast recovery diode D1 one end ground connection, a termination oil sprayer L's is high-end, and self induction electromotive force is in the negative overshoot of high-end generation when being used to suppress oil sprayer L and closing; The high low side of oil sprayer L is respectively by capacitor C 1 and capacitor C 2 ground connection, the noise that produces when being used to eliminate oil sprayer L power on/off, and the negative overshoot when further eliminating oil sprayer L and closing; Sustained diode 2 is used for isolating when oil sprayer L closes, after the negative overshoot of the high-end generation of oil sprayer L, the positive overshoot of transmitting from the low side of oil sprayer L to flash driven MOS pipe Q1 source electrode (this positive overshoot also can be smashed with flash driven MOS pipe Q1 annexation flash driving chip); Sustained diode 3 is used to suppress the positive overshoot that self induction electromotive force produces at oil sprayer L low side when oil sprayer L closes.
As shown in Figure 4, the dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit, electric current changes course, and the period one descends slowly with periods two electric current, and is consistent with Fig. 2 a circuit lowering speed, and periods three electric current descends fast, and is consistent with Fig. 2 b circuit lowering speed.Oil sprayer high-end with ground between be connected a reverse Ultrafast recovery diode, the driving chip that the oil sprayer self induction electromotive force can not smashed flash driven MOS pipe in the negative overshoot of high-end generation; Simultaneously the oil sprayer low side is connected an afterflow diode with the VCC power supply, does not ruin and hangs down limit driven MOS pipe so self induction electromotive force can not produce above the positive overbump of VCC power supply.Analyze and test as can be known, the transfer characteristic of freewheeling circuit is not influenced by above-mentioned two diodes can, and the freewheeling circuit Security also is improved.Build experimental circuit according to Fig. 3, circuit continuous operation 15 hours, accumulative total is worked and was not all broken down in 200 hours, and compares with Fig. 2 c circuit, and the cyclical variations amount of oil sprayer oil spout is reduced to a very little value (oil spout cyclical variations amount is also relevant with the type and the machining accuracy of oil sprayer).Through experimental verification, this freewheeling circuit control accuracy when guaranteeing safety reliability also reaches desirable requirement.
Oil sprayer oil spout control procedure is as follows in the dynamo-electric control of the novel diesel of the present invention oil sprayer freewheeling circuit:
1) when oil sprayer L need open oil spout, flash driven MOS pipe Q1 and low limit driven MOS pipe Q2 conducting simultaneously, oil sprayer L energising, electric current begins to rise.When electric current rises to certain numerical value, oil sprayer L opens fully and (rises to the maximum value that oil sprayer allows when electric current and do not open fully, then flash driven MOS pipe Q1 continues conducting, flash driven MOS pipe Q1 uses PWM ripple mode to control break-make, makes oil sprayer L electric current maintain an OK range wait oil sprayer and opens fully).
2) oil sprayer L opens fully, and it is big that oil sprayer L inductance becomes, and needs this moment less current just can guarantee that oil sprayer L continues to open.This moment, flash driven MOS pipe Q1 continued conducting, and low limit driven MOS pipe Q2 closes, oil sprayer L outage, and electric current begins to descend, and drops to a suitable value up to electric current.This process is exactly the period one that electric current descends, owing to can think short circuit during flash driven MOS pipe Q1 conducting, so the freewheeling circuit of this moment has the afterflow pattern identical with Fig. 2 a circuit, Security is no problem.
3) when oil sprayer L electric current drops to a desired value, need certain controlling schemes to make electric current remain to a suitable scope, to guarantee lasting the opening fully of oil sprayer L.This moment, flash driven MOS pipe Q1 continued conducting, and low limit driven MOS pipe Q2 uses PWM ripple mode to control break-make, and oil sprayer L electric current is maintained in this suitable scope, finishes up to injection process.In this process, when low limit driven MOS pipe Q2 closes, it is exactly the period two that electric current descends, because flash driven MOS pipe Q1 is on state always, so the freewheeling circuit of this moment has the afterflow pattern identical with Fig. 2 a circuit, this moment, electric current descended slowly, and electric current can be stabilized in the small range.
4) after injection process finishes, need close oil sprayer L, thoroughly close low limit driven MOS pipe Q2 this moment, electric current continues to drop to zero, and this process is exactly the period three that electric current descends.In order to obtain the afterflow pattern identical with Fig. 2 b circuit, flash driven MOS pipe Q1 also should close at once.At this moment oil sprayer L can produce very big self induction electromotive force, but because the acting in conjunction of Ultrafast recovery diode D1, sustained diode 2, sustained diode 3, capacitor C 1 and capacitor C 2 makes the influence of self induction electromotive force drop to minimum.Thereby oil sprayer L does not cause damage to any chip with the fastest speed safety shutdown, has finished an oil spout.
5) injection process will repeat 1 next time)～4) controlling schemes.
In sum, when using the dynamo-electric control of novel diesel of the present invention oil sprayer freewheeling circuit, in injection process, flash driven MOS pipe Q1 conducting always in this process, low limit driven MOS pipe Q2 then changes the break-make sequential as required, just can realize the oil spout control of highi degree of accuracy, high reliability.
Claims (2)
1. a novel diesel electromechanics is controlled the oil sprayer freewheeling circuit, include low limit driven MOS pipe (Q2), the source ground of described low limit driven MOS pipe (Q2), drain electrode connects an end of oil sprayer (L), it is characterized in that: the other end of described oil sprayer (L) connects the source electrode of flash driven MOS pipe (Q1) by a fly-wheel diode (D2), this end of oil sprayer (L) is also by a Ultrafast recovery diode (D1) ground connection, the drain electrode of described flash driven MOS pipe (Q1) connects the VCC power supply, and the drain electrode of described low limit driven MOS pipe (Q2) also connects the VCC power supply by a fly-wheel diode (D3).
2. the dynamo-electric control of novel diesel according to claim 1 oil sprayer freewheeling circuit is characterized in that the two ends of described oil sprayer (L) are respectively by an electric capacity (C1, C2) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101835762A CN102278220A (en) | 2011-07-01 | 2011-07-01 | Novel free-wheeling circuit for electronically controlled injector of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101835762A CN102278220A (en) | 2011-07-01 | 2011-07-01 | Novel free-wheeling circuit for electronically controlled injector of diesel engine |
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| CN102278220A true CN102278220A (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101835762A Pending CN102278220A (en) | 2011-07-01 | 2011-07-01 | Novel free-wheeling circuit for electronically controlled injector of diesel engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500298A (en) * | 2014-12-03 | 2015-04-08 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Driving current control circuit of piezoelectric ceramic diesel injector |
| CN110284983A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of fuel injection control circuit and fuel injection control method |
| CN111682758A (en) * | 2020-06-15 | 2020-09-18 | 温州长江汽车电子有限公司 | Automobile light mixing system DCDC converter and detection method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430601A (en) * | 1993-04-30 | 1995-07-04 | Chrysler Corporation | Electronic fuel injector driver circuit |
| CN1651742A (en) * | 2005-01-07 | 2005-08-10 | 清华大学 | Integrated bivoltage electromagnet valve driven circuit |
| CN1728497A (en) * | 2005-07-20 | 2006-02-01 | 镇江江奎科技有限公司 | Drive circuit of high and low level switch combination with voltage boost circuit |
| CN2937707Y (en) * | 2006-08-25 | 2007-08-22 | 徐海承 | Drive device of high speed magnetic valve |
| CN201650475U (en) * | 2010-03-03 | 2010-11-24 | 中国一拖集团有限公司 | Electric control unit pump fuel injector driver |
-
2011
- 2011-07-01 CN CN2011101835762A patent/CN102278220A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430601A (en) * | 1993-04-30 | 1995-07-04 | Chrysler Corporation | Electronic fuel injector driver circuit |
| CN1651742A (en) * | 2005-01-07 | 2005-08-10 | 清华大学 | Integrated bivoltage electromagnet valve driven circuit |
| CN1728497A (en) * | 2005-07-20 | 2006-02-01 | 镇江江奎科技有限公司 | Drive circuit of high and low level switch combination with voltage boost circuit |
| CN2937707Y (en) * | 2006-08-25 | 2007-08-22 | 徐海承 | Drive device of high speed magnetic valve |
| CN201650475U (en) * | 2010-03-03 | 2010-11-24 | 中国一拖集团有限公司 | Electric control unit pump fuel injector driver |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500298A (en) * | 2014-12-03 | 2015-04-08 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Driving current control circuit of piezoelectric ceramic diesel injector |
| CN104500298B (en) * | 2014-12-03 | 2017-01-25 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Driving current control circuit of piezoelectric ceramic diesel injector |
| CN110284983A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of fuel injection control circuit and fuel injection control method |
| CN110284983B (en) * | 2019-06-28 | 2022-04-05 | 潍柴动力股份有限公司 | Oil injection control circuit and oil injection control method |
| CN111682758A (en) * | 2020-06-15 | 2020-09-18 | 温州长江汽车电子有限公司 | Automobile light mixing system DCDC converter and detection method thereof |
| CN111682758B (en) * | 2020-06-15 | 2023-12-29 | 浙江长江汽车电子有限公司 | DCDC converter of automobile light mixing system and detection method thereof |
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Application publication date: 20111214 |