CN101368520A - Full-digitalization oil ejector driving and fault detection circuit - Google Patents
Full-digitalization oil ejector driving and fault detection circuit Download PDFInfo
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Abstract
The invention discloses a fully-digital fuel injector drive and fault detection circuit which comprises a fuel injection group composed of the sequential connection of an engine control unit, a programmable logic unit, a drive and detection unit and a plurality of fuel injectors. The engine control unit includes a clock signal, a fuel injector group control signal and a timing module. The programmable logic unit includes a fuel injector group control signal, a high-pressure drive signal separator, an optimum wave synthesizer, a clock divider and a logical calculus. The drive and detection unit is provided with a plurality of high-low edge drive modules, a plurality of power drive modules and a plurality of detection modules. The fully-digital fuel injector drive and fault detection circuit has the advantages of realizing the high and low pressure time-sharing control, digital design, simple structure, high integration degree, low power consumption, accurate control, convenient diagnosis, improving the response of the opening and closing of the fuel injector and reducing the design cost greatly. The fully-digital fuel injector drive and fault detection circuit is applicable to all the electromagnetic actuators or is extended on the drive channel of the drive and fault detection circuit to be applicable to the engines with more cylinders.
Description
Technical field
The present invention relates to a kind of oil sprayer digital drive and fault diagnosis circuit.Particularly relate to a kind of high and low pressure timesharing control that can realize to oil sprayer, Design of digital, simple in structure, power consumption is little, and control is accurate, and full-digitalization oil ejector easy to implement drives and fault-detecting circuit.
Background technique
In order to realize the flexible control technique of high pressure co-rail system multiple pulse fuel injection mode, require high pressure common rail injector will have higher opening and closing speed of response, this is not only to the demands for higher performance of common-rail injector, and requirement has high performance drive circuit, also to guarantee simultaneously co-rail oil injection under rugged environment reliably, work safely, this has just proposed challenge to the drive circuit and the fault diagnosis circuit design of common-rail injector.According to the performance characteristic of fuel injector magnetic system, its perfect driving is: when the armature adhesive, should inject Peak current to electromagnetic valve coil with fast as far as possible speed earlier, make its rapid adhesive.After the adhesive, magnetic air gap reduces, and magnetic resistance reduces, and solenoid valve only needs less keep electric current and promptly can keep adhesive reliably.When discharging, in order to reduce the release delay of solenoid valve, should cut off driving current as quickly as possible, discharge the electrical potential energy of solenoid valve.Adopt the less electric current of keeping keeping the adhesive stage, can accelerate the release rate of solenoid valve on the one hand, can also reduce the energy consumption of storage battery on the other hand, and reduce the heat load of electromagnetic valve coil and power drive unit.
In order to realize this desirable driving mode, research institution has developed the multiple drive circuit that differs from one another both at home and abroad, and its essence all is that solenoid valve is applied different voltage or electric current in open stage and adhesive stage.Driving mode adopts drive signal as shown in Figure 4, and this drive signal keeps ripple c three parts synthetic by master pulse a, zero pulse b and PWM.Master pulse makes the line solenoid valve loop current reach enough big operating current rapidly and solenoid valve can be opened fast, PWM keeps ripple that electromagnetic valve coil is worked in to be enough to keep the ideal current that solenoid valve is opened, and zero pulse makes driving current fall back to the maintenance electric current from Peak current rapidly.This drive signal is the optimal control signal that meets solenoid-driven, and we are called for short him for optimizing ripple, shown in the d among Fig. 4 here.
Though, the electric current in the control electromagnetic valve different operating stage that existing drive circuit greatly can be more satisfactory, really each is different for the mode of drive circuit reality.Sum up traditional method following certain situation is arranged, with regard to drive signal synthetic, dual mode is arranged, a kind of is that counter/timer by integrated chip utilizes interrupt service routine to trigger each pulse that obtains in the drive signal, realize by arithmetic logic unit is synthetic again, this method not only will take a large amount of hardware interrupts resources, and interrupt service routine complex structure, parameter call is frequent, taken valuable cpu resource, and there is hysteresis effect in the signal of logic after synthetic owing to interrupt time-delay, even if use 32 motor special microprocessors of the eTPU unit that has powerful Periodic Processing Functions, the precision of drive signal also is difficult to guarantee.Another kind of mode is realized by design of hybrid circuits, wherein utilizes the current sample feeder loop to produce and keeps the ripple drive signal, thus the maintenance electric current in the control electromagnetic valve loop; Adopt time-delay trigger to produce main bang, thus the size of Peak current in the control electromagnetic valve loop; To relate to a large amount of sampling resistors, amplifier, comparator, trigger and arithmetic logic unit etc. in the circuit simultaneously.Though this method has reduced the utilization to cpu resource, but the external circuit device is more, relate to the digital circuit and the responsive analog circut mix design of high frequency, work brings bigger difficulty to circuit design, does not meet circuit design digitizing and integrated trend.With regard to solenoid-driven voltage, dual mode is also arranged, a kind of is single high drive, this mode makes the design of driving circuit for electromagnetic valve more succinct, be easy to realize, but the specific power that he changes boost converter has proposed very high requirement, needs the multichannel boost converter could satisfy the demand of solenoid valve to power sometimes, be difficult to realize the miniaturization of boost module, also be not suitable in ECU, installing.Another kind of mode is that high and low pressure (24V) timesharing drives, this mode makes the design of driving circuit for electromagnetic valve slightly complicated, but the requirement to boost converter reduces greatly, common one the tunnel boosts just can satisfy the demand of the power of multichannel solenoid valve, also can reduce the heat load of booster circuit, but the synthetic of high and low pressure drive signal is difficult point in the design, needs to seek reasonably succinct design proposal.
PLD is the important means that most of Design of Digital Circuit engineer realizes its design object, no matter logic is simple I/O or complicated state machine, most of FPGA is to use hardware description language to write, and carries out on programmable logic component.Programmable logic element (PLD) is the digital IC of most widely used customization, and the user can write the logical operation program according to the needs of oneself, and the logical operation program is written to programmable logic element just can realizes the design object of oneself.In the nineties in 20th century, CPLD more complicated PLD appearred, i.e..CPLD has the more logical resource and the door of horn of plenty, be based on the chip of electric design automation (EDA) technology, but it has the static state overprogram and dynamically in the characteristic of system reconfiguration, makes the function of hardware to revise flexibly, improves the versatility of electronic system design greatly.And based on CPLD can be easily to carry out logic to the solenoid-driven signal synthetic, the rational also structure of simplified driving circuit to greatest extent of design simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, a kind of high and low pressure timesharing control that can realize oil sprayer is provided, Design of digital, simple in structure, power consumption is little, control accurately, full-digitalization oil ejector easy to implement drives and fault-detecting circuit.
The technical solution adopted in the present invention is: a kind of full-digitalization oil ejector drives and fault-detecting circuit, includes: the control unit of engine of Lian Jieing, programmable logic cells, driving and detection unit and the oil sprayer group that is made of a plurality of oil sprayers successively.
Described control unit of engine includes: for programmable logic cells provides the CLK clock of CLK clock, the time block of exporting to the oil sprayer group control signal of programmable logic cells and being used for the testing signal of oil sprayer is made analysis and diagnosis.
Described programmable logic cells includes: receive the oil sprayer group control signal of programmable logic cells, isolate the high-voltage driven signal separator of the flash control signal of drive circuit; The optimization ripple synthesizer of the low limit control signal of the oil sprayer group control signal optimization drive circuit of reception programmable logic cells; The Clock dividers of low-frequency clock benchmark is provided for high-voltage driven signal separator and optimization ripple synthesizer; And the signal of programmable logic cells carried out the logic OR computing and output to the logical-arithmetic unit of control unit of engine.
Described oil sprayer group is the oil sprayer group that is made of six oil sprayers.
Described driving includes with detection unit: with the high-voltage driven signal separator of programmable logic cells with optimize that the ripple synthesizer links to each other and with the corresponding a plurality of high and low limits of a plurality of oil sprayers driver module; Link to each other with high and low limit driver module and to a plurality of power driver modules of oil sprayer group output signal; And link to each other with the oil sprayer group and to receive its signal and to a plurality of testing modules of the logical-arithmetic unit output detection signal of programmable logic cells.
Described each high and low limit driver module includes high and low limit power tube driving chip U20, and wherein, among the U20: 1 pin connects the 12V power supply, also passes through the ground connection in parallel of capacitor C 148, C149; 4 pin ground connection; 2 pin connect the output HIN-DRIBVER end of the high-voltage driven signal separator of programmable logic cells; 3 pin connect the output LIN-DRIBVER end of the optimization ripple synthesizer of programmable logic cells; 5,7 pin are the input end that signal output part connects power driver module, and 6,8 pin are the output terminal that signal input part connects power model.
Described each power driver module includes high side power pipe Q9 and low limit power tube Q12, wherein, the signal of being exported by 7 pin of high and low limit driver module passes through the grid that resistance R 158 connects high side power pipe Q9, the grid of high side power pipe Q9 also by reference diode D61 with its source electrode and the rectifier lamp D88 that links to each other with the 24V power supply to output terminal INJECTOR_H port, and the drain electrode of high side power pipe Q9 connects the 110V power supply; Signal from the output of 5 pin of high and low limit driver module, the grid that connects low limit power tube Q12 by resistance R 161, the source electrode connection detection module of low limit power tube Q12, low limit power tube Q12 drains to the INJECTOR_L port, also by commutation diode D64 to 24V power supply; 8 pin of high and low limit driver module also pass through the drain electrode of the series connection high side power pipe Q9 of diode D58 and resistance R 153, also by the connect ground connection of diode D58 with resistance R 154; 8 pin of high and low limit driver module also in parallel and 6 pin by capacitor C 142, C143 together to the output terminal INJECTOR_H port of power driver module; Described INJECTOR_H port is connected on two wiring terminals of fuel injector magnetic system with the INJECTOR_L port is corresponding respectively.
Described each testing module includes comparator U16B and operational amplifier U17B, wherein, the signal of coming from the source electrode of the low limit power tube Q12 of power driver module, by after resistance R 173, the R174 sampling respectively through in-phase input end 5 pin of resistance R 164, and to inverting input 6 pin of operational amplifier U17B to operational amplifier U17B; In-phase input end 5 pin of operational amplifier U17B are also by capacitor C 155 ground connection; The 4 pin ground connection of operational amplifier U17B, 6 pin by resistance R 179 connect output terminal 7 pin, 8 pin connect the 3.3V power supply; Output terminal 7 pin of operational amplifier U17B connect inverting input 6 pin of comparator U16B by resistance R 165, also by the connect ground connection of resistance R 165 with capacitor C 156; The in-phase input end pin 5 of comparator U16B connects the 3.3V power supply, also by capacitor C 154 ground connection, the 4 pin ground connection of comparator U16B, 8 pin connect the 3.3V power supply, output terminal 7 pin of comparator U16B connect the 3.3V power supply by resistance R 166, output terminal 7 pin are also to output terminal CHECK end, and output terminal CHECK end links to each other with the logical-arithmetic unit of programmable logic cells.
Another technological scheme of the present invention is: a kind of full-digitalization oil ejector drives and fault-detecting circuit, includes: the control unit of engine of Lian Jieing, simple programmable logical device or Field Programmable Gate Array, driving and detection unit and the oil sprayer group that is made of a plurality of oil sprayers successively.
Full-digitalization oil ejector of the present invention drives and fault-detecting circuit, has realized the high and low pressure timesharing control to oil sprayer, Design of digital, and simple in structure, power consumption is little, and control is accurately, and is easy to implement; Compact to design, the level of integration height is diagnosed convenient, fast; Adopted discharge circuit simultaneously, improved the response of oil sprayer opening and closing, drive circuit does not need extra auxiliary element, greatly reduces design cost.The present invention is applicable to all electricmagnetic actuators, also can drive passage to it and expand, and makes it be applicable to the more motor of multi-cylinder number.
Description of drawings
Fig. 1 is an entire block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of programmable logic cells of the present invention;
Fig. 3 is the circuit theory diagrams of driving of the present invention and detection unit;
Fig. 4 is the optimal control signal graph of fuel injector magnetic system.
Embodiment
Below in conjunction with embodiment and accompanying drawing full-digitalization oil ejector driving of the present invention and fault-detecting circuit are made a detailed description.
As shown in Figure 1, full-digitalization oil ejector of the present invention drives and fault-detecting circuit, includes: the control unit of engine ECU of Lian Jieing, programmable logic cells CPLD, driving and detection unit DR-CH and the oil sprayer group INJ that is made of a plurality of oil sprayers successively.Described oil sprayer group INJ is the oil sprayer group that is made of six oil sprayers.
Full-digitalization oil ejector of the present invention drives and fault-detecting circuit, can also be to include: the control unit of engine ECU of Lian Jieing, simple programmable logical device PLD or Field Programmable Gate Array FPGA, driving and detection unit DR-CH and the oil sprayer group INJ that is made of a plurality of oil sprayers successively.That is, replace programmable logic cells CPLD with simple programmable logical device PLD or Field Programmable Gate Array FPGA.
Described control unit of engine ECU includes: for programmable logic cells CPLD provides the CLK clock E1 of CLK clock, the time block E3 that exports to the oil sprayer group control signal E2 of programmable logic cells CPLD and be used for the testing signal of oil sprayer is made analysis and diagnosis.
Described programmable logic cells CPLD includes: receive the oil sprayer group control signal E2 of programmable logic cells CPLD, isolate the high-voltage driven signal separator C2 of the flash control signal of drive circuit; The optimization ripple synthesizer C3 of the low limit control signal of the oil sprayer group control signal E2 optimization drive circuit of reception programmable logic cells CPLD; The Clock dividers C1 of low-frequency clock benchmark is provided for high-voltage driven signal separator C2 and optimization ripple synthesizer C3; And the signal of programmable logic cells CPLD carried out the logic OR computing and output to the logical-arithmetic unit C4 of control unit of engine ECU.It is the module of MAX3064A that programmable logic cells CPLD among the present invention adopts model as shown in Figure 2.
Described driving includes with detection unit DR-CH: with the high-voltage driven signal separator C2 of programmable logic cells CPLD with optimize that ripple synthesizer C3 links to each other and with the corresponding a plurality of high and low limit driver module P1 of a plurality of oil sprayers; Link to each other with high and low limit driver module P1 and to a plurality of power driver module P2 of oil sprayer group INJ output signal; And link to each other with oil sprayer group INJ and to receive its signal and to a plurality of testing module P3 of the logical-arithmetic unit C4 of programmable logic cells CPLD output detection signal.
As shown in Figure 3, described each high and low limit driver module P1 includes high and low limit power tube driving chip U20, and wherein, among the U20: 1 pin connects the 12V power supply, also passes through the ground connection in parallel of capacitor C 148, C149; 4 pin ground connection; 2 pin connect the output HIN-DRIBVER end of the high-voltage driven signal separator C2 of programmable logic cells CPLD; 3 pin connect the output LIN-DRIBVER end of the optimization ripple synthesizer C3 of programmable logic cells CPLD; 5,7 pin are the input end that signal output part meets power driver module P2, and 6,8 pin are the output terminal that signal input part meets power model P2.
Described each power driver module P2 includes high side power pipe Q9 and low limit power tube Q12, wherein, the signal of being exported by 7 pin of high and low limit driver module P1 passes through the grid that resistance R 158 connects high side power pipe Q9, the grid of high side power pipe Q9 also by reference diode D61 with its source electrode and the rectifier lamp D88 that links to each other with the 24V power supply to output terminal INJECTOR_H port, and the drain electrode of high side power pipe Q9 connects the 110V power supply; Signal from the output of 5 pin of high and low limit driver module P1, the grid that connects low limit power tube Q12 by resistance R 161, the source electrode connection detection module P3 of low limit power tube Q12, low limit power tube Q12 drains to the INJECTOR_L port, also by commutation diode D64 to 24V power supply; 8 pin of high and low limit driver module P1 also pass through the drain electrode of the series connection high side power pipe Q9 of diode D58 and resistance R 153, also by the connect ground connection of diode D58 with resistance R 154; 8 pin of high and low limit driver module P1 also in parallel and 6 pin by capacitor C 142, C143 together to the output terminal INJECTOR_H port of power driver module P2; Described INJECTOR_H port is connected on two wiring terminals of fuel injector magnetic system with the INJECTOR_L port is corresponding respectively.
Described each testing module P3 includes comparator U16B and operational amplifier U17B, wherein, the signal of coming from the source electrode of the low limit power tube Q12 of power driver module P2, by after resistance R 173, the R174 sampling respectively through in-phase input end 5 pin of resistance R 164, and to inverting input 6 pin of operational amplifier U17B to operational amplifier U17B; In-phase input end 5 pin of operational amplifier U17B are also by capacitor C 155 ground connection; The 4 pin ground connection of operational amplifier U17B, 6 pin by resistance R 179 connect output terminal 7 pin, 8 pin connect the 3.3V power supply; Output terminal 7 pin of operational amplifier U17B connect inverting input 6 pin of comparator U16B by resistance R 165, also by the connect ground connection of resistance R 165 with capacitor C 156; The in-phase input end pin 5 of comparator U16B connects the 3.3V power supply, also by capacitor C 154 ground connection, the 4 pin ground connection of comparator U16B, 8 pin connect the 3.3V power supply, output terminal 7 pin of comparator U16B connect the 3.3V power supply by resistance R 166, output terminal 7 pin are also to output terminal CHECK end, and output terminal CHECK end links to each other with the logical-arithmetic unit C4 of programmable logic cells CPLD.
Further specify working principle of the present invention below in conjunction with accompanying drawing.
The present invention is mainly used in six cylinder engine, so among the oil sprayer group control signal E2 six oil sprayer control channels are arranged, high-voltage driven signal separator C2 and optimization ripple synthesizer C3 also have six output ports respectively, high and low limit driver module P1, power driver module P2 also have six circuit that function is identical with structure respectively with testing module P3, and the INJECTOR unit is the oil sprayer group that six oil sprayers constitute.Only drawn the driving and the testing circuit figure of first cylinder injector among Fig. 3, and the connecting port of other five cylinders, the letter names in the port title are represented the link position in the circuit diagram, the connecting port of which cylinder of the digitized representation in the port title.Two port tables consistent with Fig. 3 middle port title at Fig. 2 are shown with the electrical equipment connection attribute.
It is little processing that control unit of engine ECU mainly adopts 32 motor car engine special chip MCF5235 of FREESCALE company, and it mainly provides three function modules, is respectively CLK clock E1, oil sprayer group control signal E2 and timer module E3.CLK clock E1 is mainly programmable logic cells CPLD CLK clock is provided, and outputs to the CLOCK port (as Fig. 2) of programmable logic cells CPLD (MAX3064A) by the clock circuit among the control unit of engine ECU.Oil sprayer group control signal E2 provide the injection control signal for oil sprayer, the oil spout moment, fuel injection pulsewidth and the fuel injection mode of output control oil sprayer, have six control channels among the oil sprayer group control signal E2, export TPU8-13 port of No. six oil sprayer control signals respectively to programmable logic cells CPLD (MAX3064A).Timer module E3 is the timer module of control unit of engine ECU (MCF5235), is used for the testing signal of oil sprayer is made analysis and diagnosis.
Programmable logic cells CPLD unit mainly contains four partial function modules, be respectively Clock dividers C1, high-voltage driven signal separator C2, optimize ripple synthesizer C3 and logical-arithmetic unit C4, these function modules are based on programmable logic cells CPLD (MAX3064A) and utilize VHDL (VHSIC hardware description language) software programming to realize, wherein Clock dividers C1, high-voltage driven signal separator C2 are realized by three parallel processes with optimization ripple synthesizer C3.The function of Clock dividers C1 mainly is for high-voltage driven signal separator C2 and optimizes the clock reference that ripple synthesizer C3 module provides low frequency, here use one 8 counter to realize, clock frequency from CLK clock E1 is 25MHZ, be connected the CLOCK port (Fig. 2) of programmable logic cells CPLD (MAX3064A), counter is every several 25 times in the program, export a CLK clock, then realize 25 times frequency division, just can obtain the CLK clock of 1MHZ, high-voltage driven signal separator C2 and optimization ripple synthesizer C3 module are just worked under the clock frequency that Clock dividers C1 sets; The function of high-voltage driven signal separator C2 is the flash control signal that is used to isolate from the control signal of oil sprayer group control signal E2 drive circuit, here use one 100 binary shift register to realize, store 100 continuous ' 1 ' in the sift register, when clock frequency is 1MHZ, high-voltage driven signal separator C2 then isolates the pulse that high level is 100us, take place successively in time from the control signal of six passages of oil sprayer group control signal E2, its rising edge triggers high-voltage driven signal separator C2 successively, wherein the control signal on TPU8-13 port triggers high-voltage driven signal separator C2 successively, and isolated successively flash control signal is respectively by the corresponding output of HIN-DRIBVER1-6 port (Fig. 2); The function of optimizing ripple synthesizer C3 is the low limit control signal that is used to from the control signal optimization drive circuit of oil sprayer group control signal E2, here use two shift registers to realize, a shift register has 150, be used for producing the master pulse and the zero pulse of low limit control signal, wherein preceding 100 of register write ' 1 ', 50 of backs write ' 0 ', when the clock frequency is 1MHZ, then optimize ripple synthesizer C3 and successively produce the master pulse of 100us and the zero pulse of 50us, utilize one 100 shift register circulation to produce PWM subsequently again, promptly keep ripple, when the clock frequency is 1MHZ, preceding 40 of register write ' 1 ', 60 of backs write ' 0 ', and then keeping the wide ratio of accounting for of ripple is 40%, thus the low limit control signal of drive circuit of having optimized ripple synthesizer C3 optimization, trigger optimization ripple synthesizer C3 successively by the control signal on TPU8-13 port, and the low limit control signal of optimization is exported by LIN-DRIBVER1-6 port (Fig. 2) is corresponding respectively successively.Logical-arithmetic unit C4 is the part of oil sprayer fault diagnosis functions, mainly the signal on the CHECK1-6 port of programmable logic cells CPLD (MAX3064A) is carried out the logic OR computing, the synthetic signal of process logic outputs to I/O (I/O) pin of control unit of engine ECU (MCF5235) again, carries out trouble analysis and diagnosis by timer module E3.
As Fig. 1, shown in Figure 3, driving and detection unit DR-CH mainly contain three partial functions, are respectively high and low limit driver module P1, power driver module P2 and testing module P3 and form.What the HIN-DRIBVER1 port of high and low limit driver module P1 connected is 3.3V flash control signal, and the connection of LIN-DRIBVER1 port is the low limit of 3.3V control signal, this two-way Transistor-Transistor Logic level signal driving force is very limited, must use special power tube driving chip, here adopt high and low limit power tube driving chip U20 (model IR2101S) to produce the flash control signal of 12V and the low limit control signal of 12V, drive high side power pipe Q9 (model IRF3415S) and low limit power tube Q12 (model 2SK3225) respectively.The flash control signal of 12V is connected the grid of high side power pipe Q9 by resistance R 158 by the 7th pin of high and low limit power tube driving chip U20, the low limit control signal of 12V is connected the grid of low limit power tube Q12 by the 5th pin of high and low limit power tube driving chip U20 by resistance R 161, and the INJECTOR1H among the power driver module P2 and INJECTOR1_L port are connected on two wiring terminals of the first cylinder injector electromagnetic valve coil (other five cylinder injectors are connected identical) simultaneously.When flash control signal and the arrival of low limit control signal, high side power pipe Q9 (IRF3415S) and low limit power tube Q12 (2SK3225) open simultaneously, 110V and 24V are isolated by rectifier lamp D88 (MURB1620CT), at this moment only high pressure 110V drives oil sprayer, and the oil sprayer current in loop rises to peak value rapidly.End along with high voltage control signal, the 110V power remove, at this moment 24V begins to provide driving power for oil sprayer by rectifier lamp D88, by the zero pulse in the control signal of base electric current is fallen after rise, make current stabilization in certain limit by the maintenance ripple again, thus the final optimal control that realizes the oil sprayer driving current.Utilize commutation diode D64 (SK34) to design discharge circuit in the oil sprayer loop simultaneously, when low limit control signal finishes, make the electric energy of oil sprayer electromagnetic coil put back to low tension power supply (24V) fast, thereby improved the shutoff speed of oil sprayer by D64 (SK34).In power driver module P2; resistance R 153, R154 are bleeder circuit; combining with rectifier lamp D88 (MURB1620CT) provides the power supply support of 36V for the 8th pin of high and low limit power tube driving chip U20; and reference diode D61 (IN5349B) keeps grid and the source voltage difference of high side power pipe Q9 to be no more than 12V, and the overvoltage protection to high side power pipe Q9 gate terminal is provided.Testing module P3 is the oil sprayer testing circuit, and its function is the detection of finishing electric current in the oil sprayer loop, and the while is realized the function of oil sprayer fault detection and diagnosis jointly in conjunction with logical-arithmetic unit C4 and timer module E3 (Fig. 1).Fault diagnosis principle be according to inductance unit after powering on, the L/R time constant of the building-up time of electric current and inductance unit self is proportional in its loop, so after inductance unit powered on, the sampling resistor terminal voltage always postponed just to set up behind the certain hour in its loop.Oil sprayer is an inductance element, if the oil sprayer short circuit, then the sampling resistor both end voltage is set up after time T 1 at once, and the time of T1 is very short; If oil sprayer is normal, then the sampling resistor both end voltage is just set up after time T 2, and the time of T2 is longer; If the oil sprayer open circuit, then the voltage at sampling resistor two ends also is 0 level after time T 3, and the time of T3 is longer, here T1〉T2〉T3.The whole process of the fault detection and diagnosis of oil sprayer will be from current detection module; shown in P3 among Fig. 3; resistance R 173 and resistance R 174 are the accurate sampling resistor in the oil sprayer loop; oil sprayer current in loop signal is sampled; sampled signal is amplified by operational amplifier U17B (AD8052) then; resistance R 172 and resistance R 179 are used to set the power gain of operational amplifier U17B; signal after the amplification is input to the inverting input of comparator U16B (LM2903); compare output detection signal with the 3.3V reference voltage; current detection signal with No. six oil sprayers among the testing module P3 is connected on the CHECK1-6 port of testing module P3 simultaneously; output to then and carry out the logic OR computing among the logical-arithmetic unit C4; signal after logic is synthetic is output to the I/O passage of control unit of engine ECU again; being responsible for short circuit by timer module E3 module regularly diagnoses; when the oil sprayer interrupt service routine is called; opening timing device module E3 interrupts simultaneously; inquire about the state of the I/O passage of control unit of engine ECU at time T 1 back timer module E3 interrupt service routine; if high level illustrates the loop short circuit of corresponding oil sprayer; then turn-off the control signal of the corresponding injector passages of oil sprayer group control signal E2 at once; protect, if be low level then normal.In like manner, can diagnose the open circuit situation in oil sprayer loop with the I/O passage of timer module E3 and control unit of engine ECU, this moment timer module E3 interrupt response the time be between T3.
Claims (9)
1. a full-digitalization oil ejector drives and fault-detecting circuit, it is characterized in that, include: the control unit of engine of Lian Jieing (ECU), programmable logic cells (CPLD), driving and detection unit (DR-CH) and the oil sprayer group (INJ) that constitutes by a plurality of oil sprayers successively.
2. full-digitalization oil ejector according to claim 1 drives and fault-detecting circuit, it is characterized in that described control unit of engine (ECU) includes: for programmable logic cells (CPLD) provides the CLK clock (E1) of CLK clock, the time block (E3) of exporting to the oil sprayer group control signal (E2) of programmable logic cells (CPLD) and being used for the testing signal of oil sprayer is made analysis and diagnosis.
3. full-digitalization oil ejector according to claim 1 drives and fault-detecting circuit, it is characterized in that, described programmable logic cells (CPLD) includes: receive the oil sprayer group control signal (E2) of programmable logic cells (CPLD), isolate the high-voltage driven signal separator (C2) of the flash control signal of drive circuit; The optimization ripple synthesizer (C3) of the low limit control signal of oil sprayer group control signal (E2) the optimization drive circuit of reception programmable logic cells (CPLD); For high-voltage driven signal separator (C2) with optimize the Clock dividers (C1) that ripple synthesizer (C3) provides the low-frequency clock benchmark; And the signal of programmable logic cells (CPLD) carried out the logic OR computing and output to the logical-arithmetic unit (C4) of control unit of engine (ECU).
4. full-digitalization oil ejector according to claim 1 drives and fault-detecting circuit, it is characterized in that described oil sprayer group (INJ) is the oil sprayer group that is made of six oil sprayers.
5. full-digitalization oil ejector according to claim 1 drives and fault-detecting circuit, it is characterized in that described driving includes with detection unit (DR-CH): with the high-voltage driven signal separator (C2) of programmable logic cells (CPLD) with optimize that ripple synthesizer (C3) links to each other and with the corresponding a plurality of high and low limit driver modules of a plurality of oil sprayers (P1); Link to each other with high and low limit driver module (P1) and to a plurality of power driver modules (P2) of oil sprayer group (INJ) output signal; And link to each other with oil sprayer group (INJ) and to receive its signal and to a plurality of testing modules (P3) of logical-arithmetic unit (C4) output detection signal of programmable logic cells (CPLD).
6. full-digitalization oil ejector according to claim 5 drives and fault-detecting circuit, it is characterized in that, described each high and low limit driver module (P1) includes high and low limit power tube driving chip U20, wherein, among the U20: 1 pin connects the 12V power supply, also passes through the ground connection in parallel of capacitor C 148, C149; 4 pin ground connection; 2 pin connect the output HIN-DRIBVER end of the high-voltage driven signal separator (C2) of programmable logic cells (CPLD); 3 pin connect the output LIN-DRIBVER end of the optimization ripple synthesizer (C3) of programmable logic cells (CPLD); 5,7 pin are the input end that signal output part meets power driver module (P2), and 6,8 pin are the output terminal that signal input part meets power model (P2).
7. full-digitalization oil ejector according to claim 5 drives and fault-detecting circuit, it is characterized in that, described each power driver module (P2) includes high side power pipe Q9 and low limit power tube Q12, wherein, the signal of being exported by 7 pin of high and low limit driver module (P1) passes through the grid that resistance R 158 connects high side power pipe Q9, the grid of high side power pipe Q9 also by reference diode D61 with its source electrode and the rectifier lamp D88 that links to each other with the 24V power supply to output terminal INJECTOR_H port, and the drain electrode of high side power pipe Q9 connects the 110V power supply; Signal from the output of 5 pin of high and low limit driver module (P1), the grid that connects low limit power tube Q12 by resistance R 161, the source electrode connection detection module (P3) of low limit power tube Q12, low limit power tube Q12 drains to the INJECTOR_L port, also by commutation diode D64 to 24V power supply; 8 pin of high and low limit driver module (P1) also pass through the drain electrode of the series connection high side power pipe Q9 of diode D58 and resistance R 153, also by the connect ground connection of diode D58 with resistance R 154; 8 pin of high and low limit driver module (P1) also in parallel and 6 pin by capacitor C 142, C143 together to the output terminal INJECTOR_H port of power driver module (P2); Described INJECTOR_H port is connected on two wiring terminals of fuel injector magnetic system with the INJECTOR_L port is corresponding respectively.
8. full-digitalization oil ejector according to claim 5 drives and fault-detecting circuit, it is characterized in that, described each testing module (P3) includes comparator U16B and operational amplifier U17B, wherein, the signal of coming from the source electrode of the low limit power tube Q12 of power driver module (P2), by after resistance R 173, the R174 sampling respectively through in-phase input end 5 pin of resistance R 164, and to inverting input 6 pin of operational amplifier U17B to operational amplifier U17B; In-phase input end 5 pin of operational amplifier U17B are also by capacitor C 155 ground connection; The 4 pin ground connection of operational amplifier U17B, 6 pin by resistance R 179 connect output terminal 7 pin, 8 pin connect the 3.3V power supply; Output terminal 7 pin of operational amplifier U17B connect inverting input 6 pin of comparator U16B by resistance R 165, also by the connect ground connection of resistance R 165 with capacitor C 156; The in-phase input end pin 5 of comparator U16B connects the 3.3V power supply, also by capacitor C 154 ground connection, the 4 pin ground connection of comparator U16B, 8 pin connect the 3.3V power supply, output terminal 7 pin of comparator U16B connect the 3.3V power supply by resistance R 166, output terminal 7 pin are also to output terminal CHECK end, and output terminal CHECK end links to each other with the logical-arithmetic unit (C4) of programmable logic cells (CPLD).
9. a full-digitalization oil ejector drives and fault-detecting circuit, it is characterized in that, include: the control unit of engine of Lian Jieing (ECU), simple programmable logical device (PLD) or Field Programmable Gate Array (FPGA), driving and detection unit (DR-CH) and the oil sprayer group (INJ) that constitutes by a plurality of oil sprayers successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101522713A CN101368520A (en) | 2008-10-09 | 2008-10-09 | Full-digitalization oil ejector driving and fault detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101522713A CN101368520A (en) | 2008-10-09 | 2008-10-09 | Full-digitalization oil ejector driving and fault detection circuit |
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| CN101368520A true CN101368520A (en) | 2009-02-18 |
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| CNA2008101522713A Pending CN101368520A (en) | 2008-10-09 | 2008-10-09 | Full-digitalization oil ejector driving and fault detection circuit |
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| CN102486131A (en) * | 2010-12-06 | 2012-06-06 | 联创汽车电子有限公司 | Driving diagnosis and protection circuit for fuel injector |
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| CN108397300A (en) * | 2017-01-16 | 2018-08-14 | 丰田自动车株式会社 | Engine system and the method for controlling engine system |
| CN108397300B (en) * | 2017-01-16 | 2021-05-07 | 丰田自动车株式会社 | Engine system and method of controlling engine system |
| CN109469554A (en) * | 2018-09-01 | 2019-03-15 | 哈尔滨工程大学 | A kind of multi-mode fuel injection actuator driven circuit |
| CN109469554B (en) * | 2018-09-01 | 2022-01-14 | 哈尔滨工程大学 | Multi-mode fuel injection actuator driving circuit |
| CN109342919A (en) * | 2018-09-27 | 2019-02-15 | 北京理工大学 | A kind of fault diagnosis system and method for automobile-used Drive Circuit for Injector Solenoid Valve |
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