CN202132161U - Fault diagnosis device for high-pressure common rail fuel injection system - Google Patents
Fault diagnosis device for high-pressure common rail fuel injection system Download PDFInfo
- Publication number
- CN202132161U CN202132161U CN201120167766U CN201120167766U CN202132161U CN 202132161 U CN202132161 U CN 202132161U CN 201120167766 U CN201120167766 U CN 201120167766U CN 201120167766 U CN201120167766 U CN 201120167766U CN 202132161 U CN202132161 U CN 202132161U
- Authority
- CN
- China
- Prior art keywords
- check point
- links
- solenoid valve
- oil pump
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 44
- 238000002347 injection Methods 0.000 title claims abstract description 18
- 239000007924 injection Substances 0.000 title claims abstract description 18
- 238000003745 diagnosis Methods 0.000 title abstract description 23
- 238000012360 testing method Methods 0.000 claims description 43
- 238000005070 sampling Methods 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 15
- 239000004065 semiconductor Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 239000003921 oil Substances 0.000 description 85
- 238000012544 monitoring process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000002405 diagnostic procedure Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Images
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a fault diagnosis device for a high-pressure common rail fuel injection system. Before an electromagnetic valve of an oil pump acts, a controller reads a diagnosis feedback signal of an oil pump electromagnetic valve fault detector and judges whether the electromagnetic valve has a circuit break fault. When the electromagnetic valve starts action, corresponding signals are read to judge whether a short circuit fault and a reliable fault occur; and before an oil injector starts execution, the diagnosis feedback signal of the oil injector is read to judge whether the short circuit fault to the ground occurs. Then a lower-side switch is started to read the signal again and judge whether the short circuit fault occurs. When the oil injector starts working, the corresponding signal is read to judge whether an internal short circuit or a reliable fault occurs. With the device and a diagnosis method, corresponding protection measures can be taken when the oil pump and the oil injector do not work, so that the fault diagnosis device plays a role in protecting an engine and an electronic control system thereof. A hardware circuit device is simple and effective, the cost of software is small, and the reliability of the high-pressure common rail fuel injection system is enhanced.
Description
Technical field
The utility model relates to a kind of high pressure common rail fuel injection system trouble-shooter.
Background technique
In the existing electronic controlled diesel fuel injection system, great majority all have the injection system trouble-shooter.Chinese patent CN1773101 discloses a kind of High Pressure Common-Rail Fuel Inject oil sprayer method for diagnosing faults, takes software approach to judge the fault of injection system oil sprayer mechanical system.The method is measured the difference of each cylinder transient rotative speed of motor earlier with crankshaft sensor; Utilize diagnostic software to confirm the cylinder that breaks down according to balance fuel injection quantity backoff algorithm between engine cylinder; The common rail cavity pressure Changing Pattern that records according to common rail pressure sensor again judges whether injection system breaks down, and confirms the accurate position of fault.Its feature is the comprehensive diagnosis after going wrong to engine mechanical or control.But the fault of electronic controlled diesel significant proportion is from the fault of sensor, final controlling element, and the method can not indicate concrete trouble location.And software overhead is big, and the working environment of common rail system is complicated, and the increase of software work amount certainly will increase the difficulty of control.On the other hand, the fault of diagnosis is not comprehensive.At first, the method has been omitted the main actuator of high-pressure common rail another one---the faut detection of high pressure oil pump.Secondly, the fault type of diagnosis is incomplete, and all is diagnosis after fault takes place, and shows no sign of and plays preventive effect.If break down, cause breaking-up or the damage of engine mechanical structure of the hardware circuit of diesel engine electric control unit probably.
Summary of the invention
The purpose of the utility model is deficiency and the defective to existing technology, and a kind of high pressure common rail fuel injection system trouble-shooter is provided.
The high pressure common rail fuel injection system trouble-shooter comprises oil pump solenoid valve failure detection device and fuel injector magnetic system Fail detecting apparatus; The internal module annexation of oil pump solenoid valve failure detection device is: controller pin 1 links to each other with oil pump solenoid valve reliability failure testing circuit; Oil pump solenoid valve reliability failure testing circuit links to each other with Check point P, Check point Q; Check point P, Check point Q link to each other with the first sampling module two ends; Controller pin 2 links to each other with oil pump solenoid valve open circuit fault testing circuit; Oil pump solenoid valve open circuit fault testing circuit links to each other with Check point A, and controller pin 3 links to each other with the first control switch M1, and controller pin 4 links to each other with oil pump solenoid valve short trouble testing circuit; Oil pump solenoid valve short trouble testing circuit links to each other with Check point B, Check point C; Check point A, Check point B link to each other with the first control switch two ends, and Check point B, Check point C link to each other with second sampling module, and power module, Check point P, first sampling module, Check point Q, oil pump solenoid valve, Check point A, first control switch, Check point B, second sampling module, Check point C connect in order; The internal module annexation of fuel injector magnetic system Fail detecting apparatus is: controller pin 5 links to each other with the 4th control switch M4; Controller pin 6 links to each other with the 3rd control switch M3; The end of M2 and M4 together meets Check point J; The other end of M2 links to each other with the low tension power supply module; The other end of M4 links to each other with high-voltage power module, and controller pin 7 links to each other with oil sprayer reliability failure testing circuit, and oil sprayer reliability failure testing circuit meets Check point J, Check point K again; Measuring point J, Check point K link to each other with the 3rd sampling module; Controller pin 8 links to each other with oil sprayer shorted to earth, oil sprayer broken circuit detection circuit, and oil sprayer shorted to earth, oil sprayer broken circuit detection circuit link to each other with Check point D, and controller pin 9 links to each other with the 3rd control switch M3; Controller pin 10 links to each other with fuel injector magnetic system internal short circuit fault testing circuit; Fuel injector magnetic system internal short circuit fault testing circuit links to each other with Check point E, Check point F, and Check point E, Check point F link to each other with the two ends of the 4th sampling module, and Check point J, the 3rd sampling module, Check point K, Check point D, fuel injector magnetic system, the 3rd control switch M3, Check point E, the 4th sampling module, Check point F connect in order.
Described oil pump solenoid valve open circuit fault testing circuit is: inductance L 1 one ends and resistance R 4 one ends are connected to form the oil pump solenoid valve, another termination of L1 24V driving voltage, D level and the resistance R 2 of another termination metal-oxide-semiconductor of R4 M1; The G level of M1 connects No. 3 interfaces of controller, i.e. control signal PUMP_IN, the opening and closing of may command M1; The S level Check point B of M1, No. 2 interfaces of another termination controller of R2 promptly open circuit and detect feedback signal PUMP_FEED; And an end of resistance R 3 and capacitor C 3, the other end ground connection of R3, the other end ground connection of C3; Play the effect of filtering, anode and the negative electrode of 3.9V reference diode D4 connect the C3 two ends respectively, the D4 plus earth.
Described oil pump solenoid valve short trouble testing circuit is: second sampling module, one terminating resistor R14; One terminating resistor R6; The other end of R14 and R6 connects the normal phase input end and the inverting input of difference amplifier respectively, and the other end of R14 is ground connection behind the connecting resistance R17 again.The end of R6 the other end connecting resistance R18; The output terminal of another termination amplifier of R18; The output terminal of amplifier and the normal phase input end that meets comparator U2 after R19 connects; Connecting resistance R20, resistance R 21 and capacitor C 5 between the normal phase input end of R19 and U2, the other end ground connection of R20 and C5, the output terminal of an other termination comparator of resistance R 21.The inverting input of resistance R 24 1 termination capacitor C6 and comparator; The other end ground connection of C6, the control interface of the other termination controller of R24, R24 and C6 form the DA circuit; The output reference level is to the reversed-phase output of comparator; The reference level of the output signal PWM ripple control reversed-phase output through controller, the input end of output terminal connecting resistance R22, capacitor C 4 and the phase inverter U3 of comparator, another termination 5V voltage of R22; The other end ground connection of C4, No. 4 interfaces of the output termination controller of phase inverter.
Described oil sprayer opens circuit, shorted to earth Fail detecting apparatus circuit is: inductance L 5 one ends and resistance R 8 one ends are connected to form fuel injector magnetic system; The D level of another termination metal-oxide-semiconductor switch of L5 M3; The G level of M3 connects No. 9 interfaces of controller; The S level of M3 meets Check point E, the negative electrode of the negative electrode of another terminating diode of R8 D17, resistance R 13, capacitor C 13, voltage-stabiliser tube D16 and No. 8 interfaces of controller, i.e. diagnostic feedback signal INJ_FEED.The anode connecting resistance R14 of D17, another termination voltage 5V of R14, the other end ground connection of R13, C13, D16.
Compare with existing technology, the beneficial effect and the advantage of the utility model are: the utility model utilizes simple and effective hardware circuit device and software judgement efficiently, reaches the various Fault Diagnosis to high-pressure common rail oil pump solenoid valve and oil sprayer.Object, the fault type of diagnosis are comprehensive, and software overhead is little.And before the final controlling element action, carry out the damage that basic diagnosis can be avoided motor and electronic control unit thereof.Adopt the described diagnostic method of the utility model to carry out fault diagnosis to Common rail fuel injection system reliably.Because hardware circuit is simple, cost is low.Because software overhead is little, increased the reliability of high pressure common rail electric-controlled system.In actual engineering application, can reach very considerable effect.
Description of drawings
Fig. 1 is oil pump solenoid-driven and faut detection block diagram;
Fig. 2 is the circuit diagram that oil pump solenoid valve open circuit fault detects;
Fig. 3 is an oil pump solenoid valve open circuit fault diagnostic flow chart;
Fig. 4 is the circuit diagram that oil pump solenoid valve short trouble detects;
Fig. 5 is an oil pump solenoid valve short trouble diagnostic flow chart;
Fig. 6 is the driving current performance plot of oil pump solenoid valve;
Fig. 7 is an oil pump solenoid valve reliability failure diagnostic flow chart;
Fig. 8 is that oil sprayer drives and the faut detection block diagram;
Fig. 9 is that fuel injector magnetic system opens circuit, shorted to earth fault-detecting circuit figure;
Figure 10 is the driving current performance plot of oil sprayer;
Figure 11 is an oil sprayer reliability failure diagnostic flow chart.
Embodiment
Specify the embodiment and the working principle of said high pressure oil pump solenoid valve of the utility model and oil sprayer fault diagnosis scheme below in conjunction with accompanying drawing.
As shown in Figure 1; The internal module annexation of oil pump solenoid valve failure detection device is: controller pin 1 links to each other with oil pump solenoid valve reliability failure testing circuit; Oil pump solenoid valve reliability failure testing circuit links to each other with Check point P, Check point Q; Check point P, Check point Q link to each other with the first sampling module two ends, and controller pin 2 links to each other with oil pump solenoid valve open circuit fault testing circuit, and oil pump solenoid valve open circuit fault testing circuit links to each other with Check point A; Controller pin 3 links to each other with the first control switch M1; Controller pin 4 links to each other with oil pump solenoid valve short trouble testing circuit, and oil pump solenoid valve short trouble testing circuit links to each other with Check point B, Check point C, and Check point A, Check point B link to each other with the first control switch two ends; Check point B, Check point C link to each other with second sampling module, and power module, Check point P, first sampling module, Check point Q, oil pump solenoid valve, Check point A, first control switch, Check point B, second sampling module, Check point C connect in order.The control signal PUMP_IN of No. 3 interface outputs of controller is the PWM ripple, the switch of control metal-oxide-semiconductor M1.M1 opens, the driving current fast rise, and M1 closes, and driving current descends rapidly, obtains the driving current characteristic of the required solenoid valve of system with this.In conjunction with the testing circuit device, Check point P, Q can accomplish the detection of oil pump solenoid valve reliability failure, and Check point A can accomplish the detection of oil pump solenoid valve open circuit fault, and Check point B, C can accomplish the detection of solenoid valve short trouble.
As shown in Figure 2, described oil pump solenoid valve open circuit fault testing circuit is: inductance L 1 one ends and resistance R 4 one ends are connected to form the oil pump solenoid valve, another termination of L1 24V driving voltage; D level and the resistance R 2 of another termination metal-oxide-semiconductor of R4 M1, the G level of M1 meets No. 3 interfaces of controller, i.e. control signal PUMP_IN; The opening and closing of may command M1, the S level Check point B of M1, No. 2 interfaces of another termination controller of R2; Promptly open circuit and detect feedback signal PUMP_FEED, and an end of resistance R 3 and capacitor C 3, the other end ground connection of R3; The other end ground connection of C3; Play the effect of filtering, anode and the negative electrode of 3.9V reference diode D4 connect the C3 two ends respectively, the D4 plus earth.Before the work of oil pump solenoid valve, when promptly control switch M1 closes, acquisition of diagnostic feedback signal PUMP_FEED.When the signal that is input to controller is high level, show that solenoid valve is in normal state.Otherwise solenoid valve possibly open circuit.After controller reads this signal, can carry out judgment processing by diagnosis algorithm.
As shown in Figure 3, before solenoid valve work, get into step S10, controller reads oil pump solenoid valve open circuit fault testing circuit from the detected diagnostic feedback signal of Check point A PUMP_FEED.Get into step S20 then, judge whether the oil pump solenoid valve open circuit fault occurs.If fault-free then gets into step S60, return after the DTC zero clearing.Otherwise, getting into step S30, failure count adds 1, and controller stops the oil pump solenoid valve when inferior driving.Then, get into step S40, judge whether the generation open circuit fault continuous ten times.If do not take place, then return.Otherwise, getting into step S50, the open circuit fault sign indicating number puts 1.The back gets into step S70, and controller forever stops the oil pump solenoid-driven.
As shown in Figure 4; Described oil pump solenoid valve short trouble testing circuit is: second sampling module, one terminating resistor R14; One terminating resistor R6, the other end of R14 and R6 connect the normal phase input end and the inverting input of difference amplifier respectively, and the other end of R14 is ground connection behind the connecting resistance R17 again.The end of R6 the other end connecting resistance R18; The output terminal of another termination amplifier of R18; The output terminal of amplifier and the normal phase input end that meets comparator U2 after R19 connects; Connecting resistance R20, resistance R 21 and capacitor C 5 between the normal phase input end of R19 and U2, the other end ground connection of R20 and C5, the output terminal of an other termination comparator of resistance R 21.The inverting input of resistance R 24 1 termination capacitor C6 and comparator; The other end ground connection of C6, the control interface of the other termination controller of R24, R24 and C6 form the DA circuit; The output reference level is to the reversed-phase output of comparator; The reference level of the output signal PWM ripple control reversed-phase output through controller, the input end of output terminal connecting resistance R22, capacitor C 4 and the phase inverter U3 of comparator, another termination 5V voltage of R22; The other end ground connection of C4, No. 4 interfaces of the output termination controller of phase inverter.When solenoid valve is worked, through the sampling resistor R5 of second sampling module, monitoring overcurrent monitor signal PUMP_I2.If short trouble appears in solenoid valve, then through the electric current moment increase of R5, R5 voltage difference is input to comparator through behind the amplifier after signal and reference level compare, comparator output high level.Therefore if monitor overcurrent monitor signal PUMP_I2 be high level then this moment, short trouble appearred in solenoid valve, the driving output that should stop corresponding circuits is with protective system.Wherein, reference level is controlled by pwm signal, adjustable size.
This circuit also is applied to oil pump solenoid valve reliability failure and detects.Reliability failure for the oil pump solenoid valve detects, and only needs when timing begins, to change the dutycycle of pwm signal, then obtains required reference level through the DA circuit.
As shown in Figure 5, for the diagnosis of oil pump solenoid valve short trouble, consider that this fault will in time obtain diagnostic feedback, can be when software development, the mode that request was interrupted when short trouble was set is accomplished.When solenoid valve moves; Controller reads oil pump solenoid valve short trouble testing circuit from Check point B, the detected overcurrent monitor signal of Check point C, if the solenoid valve failed because gets into step S80; Failure count adds 1, and controller stops the oil pump solenoid valve when inferior driving.Then, get into step S90, whether failure judgement is counted greater than 2, if not then return.Otherwise, getting into step S100, DTC puts 1.Progressive then S110, controller is removed counting, forever stops the driving of oil pump solenoid valve.
As shown in Figure 6, the high pressure oil pump solenoid valve is by the 24V power source driving, keeps electric current branch one-level and keeps with secondary and keep two-part.The rise time of current waveform is by software control, starting point and clearing end that software control is risen.Because the long-term action of solenoid valve, its reliability is tested, actual current waveform with have certain difference in theory.Therefore; Electromagnetic valve current draw high time T 1, one-level keep T2 fall time, one-level keep rise time T3, one-level be maintained to T4 fall time, secondary that secondary keeps keep rise time T5, secondary keep fall time T6 and secondary be maintained to 0 T7 fall time and will detect; And carry out software and judge, to confirm whether solenoid valve reliability failure occurs.Detection and software about above each time parameter judge that therefore principle is all roughly the same only lifted an example and explained.Keeping rise time T3 with the detection one-level is example, and the start time point in that the software control electric current rises starts a timer simultaneously, and the reference level value of setting sampling driving current circuit is the stop value that corresponding electric current rises.The electric current that rises is through sampling resistor R1, amplifier, comparator, and then driving current characteristic monitor signal PUMP_I1 produces an edge pulse at the terminating point that electric current rises, the stopping of triggering timing device.Catch the value of timer, be one-level and keep rise time T3 value, then relatively its whether within corresponding CLV ceiling limit value and lower limit.Not within, conclude that then reliability failure appears in solenoid valve.
As shown in Figure 7, high pressure oil pump solenoid valve reliability failure diagnostic process is following: enable control signal PUMP_IN at software and begin when effective, the timer of appointment brings into operation, i.e. step S120 among the figure.And the initial value of setting timer is 0, is set to external trigger and stops mode, and outer triggering signal is monitor signal PUMP_I1.Step S130 is time-delay wait routine, waiting step S140: trigger signal timer out of service.The mode of trigger signal is that the edge triggers, if the rise time of monitoring current can be provided with monitor signal and be converted to high level by low level, it is out of service to trigger timer.If can be provided with monitor signal and be converted to low level by high level the fall time of monitoring current, it is out of service to trigger timer.Wherein, judge that according to state value Pcount electric current still descends for rising.Step S150 gets electric current and changes time T for catching timer value, the CLV ceiling limit value Tmax of known variant time and lower limit Tmin, and < < Tmax judges reliability failure to T then can whether to satisfy Tmin through T.Satisfying condition then gets into step S160 and returns 0, representes no reliability failure.If do not satisfy, then get into step S180 and return 1, reliability failure appears in expression, and controller stops the oil pump solenoid valve when inferior driving.Wherein, the reference level of comparator is provided with corresponding reference level according to difference constantly.Concrete constantly by parameter Pcount judgement, the Pcount initial value is 1.Final step S170 is for judging whether the reliability failure diagnosis is accomplished.Because have 7 time parameters to need to detect, during parameter detecting of every completion, Pcount adds one, whether can judge whether to accomplish faut detection greater than 7 according to Pcount.
As shown in Figure 8; The internal module annexation of fuel injector magnetic system Fail detecting apparatus is: controller pin 5 links to each other with the 4th control switch M4; Controller pin 6 links to each other with the 3rd control switch M3; The end of M2 and M4 together meets Check point J, and the other end of M2 links to each other with the low tension power supply module, and the other end of M4 links to each other with high-voltage power module; Controller pin 7 links to each other with oil sprayer reliability failure testing circuit; Oil sprayer reliability failure testing circuit meets Check point J, Check point K again, and measuring point J, Check point K link to each other with the 3rd sampling module, and controller pin 8 links to each other with oil sprayer shorted to earth, oil sprayer broken circuit detection circuit; Oil sprayer shorted to earth, oil sprayer broken circuit detection circuit link to each other with Check point D; Controller pin 9 links to each other with the 3rd control switch M3, and controller pin 10 links to each other with fuel injector magnetic system internal short circuit fault testing circuit, and fuel injector magnetic system internal short circuit fault testing circuit links to each other with Check point E, Check point F; Check point E, Check point F link to each other with the two ends of the 4th sampling module, and Check point J, the 3rd sampling module, Check point K, Check point D, fuel injector magnetic system, the 3rd control switch M3, Check point E, the 4th sampling module, Check point F connect in order.The two ends of fuel injector magnetic system connect high-end switch and low-end switch respectively.After the low-end switch metal-oxide-semiconductor was opened, No. 5 interfaces of controller output useful signals were opened MOS switch M4 and are accomplished the drawing high of driving current, and then No. 6 mouths output useful signals are opened MOS switch M2 and accomplished keeping of driving current.Low-end switch M3 accomplishes the control to the driving current pulsewidth.Obtain the driving current characteristic of the required fuel injector magnetic system of system with this.In conjunction with the testing circuit equipment energy characteristic, Check point J, K can accomplish the detection of fuel injector magnetic system reliability failure, and Check point D can accomplish that fuel injector magnetic system opens circuit, the detection of shorted to earth fault, and Check point E, F can accomplish the detection of solenoid valve short trouble.
As shown in Figure 9; Described oil sprayer opens circuit, shorted to earth Fail detecting apparatus circuit is: inductance L 5 one ends and resistance R 8 one ends are connected to form fuel injector magnetic system; The D level of another termination metal-oxide-semiconductor switch of L5 M3, the G level of M3 connects No. 9 interfaces of controller, and the S level of M3 meets Check point E; The negative electrode of the negative electrode of another terminating diode of R8 D17, resistance R 13, capacitor C 13, voltage-stabiliser tube D16 and No. 8 interfaces of controller, i.e. diagnostic feedback signal INJ_FEED.The anode connecting resistance R14 of D17, another termination voltage 5V of R14, the other end ground connection of R13, C13, D16.Before the oil sprayer proper functioning, when promptly M3 closed, it is high that circuit feedback signal INJ_FEED should be, if low, oil sprayer shorted to earth fault possibly take place then.Then, controller output test signal is opened M4, and it is low that circuit feedback signal should be, if high, then the solenoid valve open circuit fault possibly take place.Detecting feedback signal when unusual, software is diagnosed.The software diagnosis process is: before oil sprayer begins to carry out; Controller reads oil sprayer shorted to earth fault-detecting circuit from the detected diagnostic feedback signal of Check point D; Judge whether oil sprayer the shorted to earth fault takes place; Controller stops fuel injector magnetic system when inferior driving if break down then, if detect continuous 10 times the driving that the shorted to earth faults then forever stop this cylinder injector takes place, and then opens low-end switch; Read this diagnostic feedback signal once more; Judge whether oil sprayer open circuit fault occurs, controller stops fuel injector magnetic system when inferior driving if break down then, if detect continuous 10 times the driving that the fuel injector magnetic system open circuit faults then forever stop this cylinder injector takes place.
About the detection of fuel injector magnetic system internal short-circuit, can be with reference to oil pump solenoid valve short trouble testing circuit.On this basis, the controller PWM ripple that only need export certain dutycycle can be accomplished the detection of fuel injector magnetic system internal short-circuit to obtain corresponding reference level.Controller is after detecting trouble signal, and software failure judgement degree is accomplished diagnosis.Its flow process is: when oil sprayer is started working; Controller reads oil sprayer internal short circuit fault testing circuit from Check point E, the detected overcurrent monitor signal of Check point F; Judge whether oil sprayer short trouble occurs; Controller stops fuel injector magnetic system when inferior driving if break down then, if detect continuous 2 times the driving that the fuel injector magnetic system internal short circuit faults then forever stop this cylinder injector takes place.
Shown in figure 10, the oil sprayer driving current draws high when high pressure is open, and get into one-level then and keep, be that secondary is kept again.Judge draw high time T 8, electric current fall time T 9, the one-level kept to one-level keep rise time T10, one-level keep T11 fall time, one-level be maintained to T12 fall time, secondary that secondary keeps keep rise time T13, secondary keep fall time T14 and secondary be maintained to fall time of 0 T15 whether in working lipe; Its timing mode is the same with the reliability diagnosis principle of oil pump solenoid valve; The software trigger timer picks up counting; Driving current characteristic monitor signal INJ_I1 produces the edge pulse, triggers timer and stops timing.Corresponding processor is also with reference to the reliability diagnosis principle of oil pump solenoid valve, and whether judgement time in working lipe, accomplishes the reliability diagnosis.Be many high pressure trace routines with the difference of oil pump, judge whether voltage reaches required high-voltage value, to guarantee open normal execution of high pressure.
Figure 11 is the said oil sprayer reliability failure of a utility model diagnostic flow chart.Begin when effective at control signal INJ_HIGHIN, get into step S190, the run timing device.The initial value of setting timer is 0, is set to external trigger and stops mode, and outer triggering signal is monitor signal INJ_I1.Electric current is converted into voltage difference through sampling resistor, through amplifier, comparator output signal INJ_I1.Corresponding relatively reference level is set, promptly exportable corresponding rising edge or trailing edge.Therefore, the mode of outer triggering signal is that the edge triggers, if the rise time of monitoring current can be provided with monitor signal and be converted to high level by low level, it is out of service to trigger timer.If can be provided with monitor signal and be converted to low level by high level the fall time of monitoring current, it is out of service to trigger timer.The state of electric current is judged by the Icount value.What at first accomplish is booster circuit and the fault diagnosis of high pressure opening hours.Therefore, delay procedure can be made as the open pulsewidth of two high pressure of time-delay.If no external trigger then gets into step S270, show that booster circuit is unusual, Write fault sign indicating number, monitoring shutdown fault.If outside effectively triggering then gets into step S210, stop the timer operation.Get into step S220 then, catch timer value, get electric current and change time T, the CLV ceiling limit value Tmax of known variant time and lower limit Tmin, < < Tmax judges reliability failure to T then can whether to satisfy Tmin through T.Satisfying condition then gets into step S280 and returns 0, representes no reliability failure.If do not satisfy, then get into step S260 and return 1, reliability failure appears in expression, and controller stops to drive when inferior of oil sprayer.Because the time that timer brings into operation is determined by software, therefore corresponding reference level can be set before bringing into operation, to accomplish the reliability failure monitoring.The value of reference level is determined by quantity of state Icount.By Icount whether owing to there are 8 time parameters to need to detect, therefore after parameter detecting of every completion, if fault-free then gets into step S240, Icount adds 1,>8 judge whether to accomplish reliability failure and detect.Do not accomplish if monitoring, then get into step S250 software opening timing device, circulation gets into and detects.
Below be schematic diagram, circuit arrangement figure and the Troubleshooting Flowchart of high pressure common rail fuel injection system method for diagnosing faults.
Claims (4)
1. a high pressure common rail fuel injection system trouble-shooter is characterized in that comprising oil pump solenoid valve failure detection device and fuel injector magnetic system Fail detecting apparatus; The internal module annexation of oil pump solenoid valve failure detection device is: controller pin 1 links to each other with oil pump solenoid valve reliability failure testing circuit; Oil pump solenoid valve reliability failure testing circuit links to each other with Check point P, Check point Q; Check point P, Check point Q link to each other with the first sampling module two ends; Controller pin 2 links to each other with oil pump solenoid valve open circuit fault testing circuit; Oil pump solenoid valve open circuit fault testing circuit links to each other with Check point A, and controller pin 3 links to each other with the first control switch M1, and controller pin 4 links to each other with oil pump solenoid valve short trouble testing circuit; Oil pump solenoid valve short trouble testing circuit links to each other with Check point B, Check point C; Check point A, Check point B link to each other with the first control switch two ends, and Check point B, Check point C link to each other with second sampling module, and power module, Check point P, first sampling module, Check point Q, oil pump solenoid valve, Check point A, first control switch, Check point B, second sampling module, Check point C connect in order; The internal module annexation of fuel injector magnetic system Fail detecting apparatus is: controller pin 5 links to each other with the 4th control switch M4; Controller pin 6 links to each other with the 3rd control switch M3; The end of M2 and M4 together meets Check point J; The other end of M2 links to each other with the low tension power supply module; The other end of M4 links to each other with high-voltage power module, and controller pin 7 links to each other with oil sprayer reliability failure testing circuit, and oil sprayer reliability failure testing circuit meets Check point J, Check point K again; Measuring point J, Check point K link to each other with the 3rd sampling module; Controller pin 8 links to each other with oil sprayer shorted to earth, oil sprayer broken circuit detection circuit, and oil sprayer shorted to earth, oil sprayer broken circuit detection circuit link to each other with Check point D, and controller pin 9 links to each other with the 3rd control switch M3; Controller pin 10 links to each other with fuel injector magnetic system internal short circuit fault testing circuit; Fuel injector magnetic system internal short circuit fault testing circuit links to each other with Check point E, Check point F, and Check point E, Check point F link to each other with the two ends of the 4th sampling module, and Check point J, the 3rd sampling module, Check point K, Check point D, fuel injector magnetic system, the 3rd control switch M3, Check point E, the 4th sampling module, Check point F connect in order.
2. a kind of high pressure common rail fuel injection system trouble-shooter according to claim 1, it is characterized in that described oil pump solenoid valve open circuit fault testing circuit is: inductance L 1 one ends and resistance R 4 one ends are connected to form the oil pump solenoid valve, another termination of L1 24V driving voltage; D level and the resistance R 2 of another termination metal-oxide-semiconductor of R4 M1, the G level of M1 meets No. 3 interfaces of controller, i.e. control signal PUMP_IN; The opening and closing of may command M1, the S level Check point B of M1, No. 2 interfaces of another termination controller of R2; Promptly open circuit and detect feedback signal PUMP_FEED, and an end of resistance R 3 and capacitor C 3, the other end ground connection of R3; The other end ground connection of C3; Play the effect of filtering, anode and the negative electrode of 3.9V reference diode D4 connect the C3 two ends respectively, the D4 plus earth.
3. a kind of high pressure common rail fuel injection system trouble-shooter according to claim 1 is characterized in that described oil pump solenoid valve short trouble testing circuit is: second sampling module, one terminating resistor R14, a terminating resistor R6; The other end of R14 and R6 connects the normal phase input end and the inverting input of difference amplifier respectively, and the other end of R14 is ground connection behind the connecting resistance R17 again, the end of R6 the other end connecting resistance R18; The output terminal of another termination amplifier of R18, the output terminal of amplifier and the normal phase input end that meets comparator U2 after R19 connects, connecting resistance R20, resistance R 21 and capacitor C 5 between the normal phase input end of R19 and U2; The other end ground connection of R20 and C5; The output terminal of an other termination comparator of resistance R 21, the inverting input of resistance R 24 1 termination capacitor C6 and comparator, the other end ground connection of C6; The control interface of the other termination controller of R24; R24 and C6 form the DA circuit, and the output reference level is controlled the reference level of reversed-phase output to the reversed-phase output of comparator through the output signal PWM ripple of controller; The input end of output terminal connecting resistance R22, capacitor C 4 and the phase inverter U3 of comparator; Another termination 5V voltage of R22, the other end ground connection of C4, No. 4 interfaces of the output termination controller of phase inverter.
4. a kind of high pressure common rail fuel injection system trouble-shooter according to claim 1; It is characterized in that described oil sprayer opens circuit, shorted to earth Fail detecting apparatus circuit is: inductance L 5 one ends and resistance R 8 one ends are connected to form fuel injector magnetic system, the D level of another termination metal-oxide-semiconductor switch of L5 M3, and the G level of M3 connects No. 9 interfaces of controller; The S level of M3 meets Check point E; The negative electrode of the negative electrode of another terminating diode of R8 D17, resistance R 13, capacitor C 13, voltage-stabiliser tube D16 and No. 8 interfaces of controller, i.e. diagnostic feedback signal INJ_FEED, the anode connecting resistance R14 of D17; Another termination voltage 5V of R14, the other end ground connection of R13, C13, D16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120167766U CN202132161U (en) | 2011-05-24 | 2011-05-24 | Fault diagnosis device for high-pressure common rail fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120167766U CN202132161U (en) | 2011-05-24 | 2011-05-24 | Fault diagnosis device for high-pressure common rail fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202132161U true CN202132161U (en) | 2012-02-01 |
Family
ID=45520932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120167766U Expired - Lifetime CN202132161U (en) | 2011-05-24 | 2011-05-24 | Fault diagnosis device for high-pressure common rail fuel injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202132161U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182603A (en) * | 2011-05-24 | 2011-09-14 | 浙江大学 | Fault diagnosis device and method for high-pressure common-rail fuel injection system |
| CN108594055A (en) * | 2018-04-26 | 2018-09-28 | 成都雅骏汽车制造有限公司 | A kind of high-tension connector connection status detection circuit |
-
2011
- 2011-05-24 CN CN201120167766U patent/CN202132161U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182603A (en) * | 2011-05-24 | 2011-09-14 | 浙江大学 | Fault diagnosis device and method for high-pressure common-rail fuel injection system |
| CN102182603B (en) * | 2011-05-24 | 2012-07-25 | 浙江大学 | Fault diagnosis device and method for high-pressure common-rail fuel injection system |
| CN108594055A (en) * | 2018-04-26 | 2018-09-28 | 成都雅骏汽车制造有限公司 | A kind of high-tension connector connection status detection circuit |
| CN108594055B (en) * | 2018-04-26 | 2020-06-09 | 成都雅骏汽车制造有限公司 | High-voltage connector connection state detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102182603B (en) | Fault diagnosis device and method for high-pressure common-rail fuel injection system | |
| CN102410122A (en) | Fault diagnosis device and method for vehicle solenoid valve | |
| CN202300765U (en) | Fault diagnosis device of automobile electromagnetic valve | |
| RU2256091C2 (en) | Method and device for internal combustion engine ignition | |
| US6820474B2 (en) | Method for the diagnosis of the voltage control for a piezoelectric actuator of an injection valve | |
| CN110031743B (en) | Self-detection method and device for rail transit vehicle traction converter | |
| CN109061431A (en) | A kind of SiC MOSFET grid fault diagnosis system and diagnostic method based on gate charge | |
| CN105569859A (en) | High-speed electromagnetic valve drive method with boosting and fault diagnosing functions and circuit | |
| EP3144512B1 (en) | Fuel injection system for internal combustion engine | |
| JP4625196B2 (en) | Fuel injection device and method of operating the fuel injection device | |
| CN101806875A (en) | Diagnosis detecting method of piezoelectric executor and device thereof | |
| CN202132161U (en) | Fault diagnosis device for high-pressure common rail fuel injection system | |
| CN102297065A (en) | Oil sprayer with closing time deviation compensation | |
| CN105355519A (en) | Intelligent permanent magnet switch drive circuit and control method therefor | |
| CN113482824B (en) | Detection method and device for oil sprayer | |
| CN113110397B (en) | High-speed electromagnetic valve driving circuit and fault diagnosis circuit and method | |
| EP2058496A1 (en) | Detection of faults in an injector arrangement | |
| CN107765118B (en) | Testing device and method for reverse recovery period protection unit of light-operated converter valve | |
| JP4977740B2 (en) | Internal combustion engine control device | |
| CN104483588A (en) | Electrical failure diagnosis method and device for relay control terminal | |
| CN111852675A (en) | Fault diagnosis system for oil injector | |
| CN104052350A (en) | Motor control and multifunctional protection circuit for vibration tests | |
| KR101990730B1 (en) | How to Monitor the Operation of a Piezo Injector | |
| CN110702405B (en) | Mechanical transmission fault detection device | |
| CN208984778U (en) | A kind of low current motor open-circuit condition detection circuit and household electrical appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120201 Effective date of abandoning: 20120725 |