CN102410122A - Fault diagnosis device and method for vehicle solenoid valve - Google Patents
Fault diagnosis device and method for vehicle solenoid valve Download PDFInfo
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- CN102410122A CN102410122A CN2011103272790A CN201110327279A CN102410122A CN 102410122 A CN102410122 A CN 102410122A CN 2011103272790 A CN2011103272790 A CN 2011103272790A CN 201110327279 A CN201110327279 A CN 201110327279A CN 102410122 A CN102410122 A CN 102410122A
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Abstract
The invention discloses a fault detection device and a diagnosis method for a vehicle solenoid valve. The fault detection device comprises a controller, an internal short circuit fault detection circuit, an open circuit and power supply short circuit fault detection circuit, a ground short circuit fault detection circuit, a power module, a first sampling module, a vehicle solenoid valve, a first control switch M1 and a second sampling module. The detection and diagnosis faults include ground short circuit fault, open circuit fault, power supply short circuit and internal short circuit fault and reliability fault of the solenoid valve, etc. The fault of the solenoid valve is mainly judged by a reasonably designed hardware circuit and an accurately developed software. The diagnosis method is used respectively before and when the electronic fuel injection engine is started, so as to ensure whether the fault occurs to the solenoid valve and take corresponding protective measures. Therefore, the engine and the electric control system thereof are protected, the hardware circuit is simple and effective, the cost can be reduced, the expense of the software is small, the reliability of the electronic fuel injection system is increased, and good effect can be achieved in the actual engineering application.
Description
Technical field
The present invention relates to the method for diagnosing faults of engine electric control fuel oil spraying system, relate in particular to a kind of automobile-used solenoid valve failure diagnosis apparatus and method thereof.
Background technique
Existing automobile-used solenoid valve failure diagnostic techniques is often to concrete final controlling element, like the fuel injector magnetic system of electric control gasoline engine.Fault type often simply is classified as and opens circuit and two types of short circuits, short trouble is not carried out more concrete analysis, causes the indefinite consequence of fault concrete reason.And this type of diagnostic techniques versatility is poor, need reformulate diagnostic measures for the solenoid valve failure of other types, and application area is very limited.In addition, this type of diagnostic method is not considered situation such as fault erroneous judgement, provisional fault, and diagnostic method is left to be desired.For example Chinese patent CN101033724 discloses a kind of failure diagnosis method of electrically controlled petrol engine fuel injector, takes software approach to judge the fault of injection system oil sprayer mechanical system.The method is set reference in-cylinder earlier; Through fire signal sensor on the reference in-cylinder ignition lead and the oil pressure transmitter on the gasoline distribution piping,, through diagnostic software image data is handled and analyzed again with the dynamic pressure of gasoline in the computer measuring basis cylinder igniting back gasoline distribution tube chamber; Obtain gasoline and distribute the time domain of oil pressure in the tube chamber or the frequency domain situation of change of wave component; Compare with oil sprayer technology status Changing Pattern just often, judge whether oil sprayer breaks down, and according to the reference in-cylinder position; The acting of binding engine order and fuel injection characteristic are confirmed the position of fault oil sprayer.Its feature is the comprehensive diagnosis after going wrong to engine mechanical or control.But the fault of electric-control motor 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 automatical control 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 mainly is applicable to electric controlled multi-point intake manifold injection petrol engine fuel injector Fault Diagnosis, function singleness; 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 petrol engine ECU probably.
Summary of the invention
The objective of the invention is deficiency, a kind of automobile-used solenoid valve failure diagnosis apparatus and method thereof are provided to existing technology.
Automobile-used solenoid valve failure diagnosis apparatus comprises controller, internal short circuit fault testing circuit, open circuit and to power supply short circuit fault-detecting circuit, shorted to earth fault-detecting circuit, power module, first sampling module, automobile-used solenoid valve, the first control switch M1 and second sampling module; Controller pin 1,2,3,4 respectively with shorted to earth fault-detecting circuit output terminal, open circuit and power supply short circuit fault-detecting circuit output terminal, the first control switch M1 input end, internal short circuit fault testing circuit output terminal linked to each other; Power module, first sampling module, automobile-used solenoid valve, the first control switch M1, second sampling module, Check point C connect in order; Shorted to earth fault-detecting circuit first input end is that Check point P links to each other, second input end is that Check point Q links to each other with the tie point of first sampling module and automobile-used solenoid valve with the tie point of the power module and first sampling module; Open circuit and be that Check point Q links to each other to the tie point of power supply short circuit fault-detecting circuit and the automobile-used solenoid valve and the first control switch M1, internal short circuit fault testing circuit first input end is that Check point B links to each other, second input end links to each other with Check point C with the tie point of the first control switch M1 and second sampling module; The control signal Valve_IN of controller pin 3 outputs is the PWM ripple; The switch of control metal-oxide-semiconductor M1; According to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2; Overcurrent monitor signal Valve_S1 gets into controller pin 1 through shorted to earth fault-detecting circuit output terminal, and overcurrent monitor signal Valve_S2 gets into controller pin 4 through internal short circuit fault testing circuit output terminal.
Describedly open circuit and to the power supply short circuit fault-detecting circuit be: inductance L 1 one ends and resistance R 1 one ends are connected to form solenoid valve; Resistance R 1 the other end links to each other with driving voltage through resistance R 3; Inductance L 1 the other end links to each other with the D utmost point, resistance R 4 one ends of metal-oxide-semiconductor M1, and the G utmost point of metal-oxide-semiconductor M1 links to each other with the pin 3 of controller, and the S utmost point of metal-oxide-semiconductor M1 links to each other with Check point B; The other end of resistance R 4 links to each other with an end of the pin of controller 2, resistance R 5 and capacitor C 1, the anode of reference diode D1; The other end ground connection of resistance R 5, the other end ground connection of C1, the plus earth of reference diode D1; The control signal Valve_IN of controller pin 3 output is the PWM ripple, the switch of control metal-oxide-semiconductor M1, according to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2.
The circuit of described shorted to earth faut detection is: first sampling module, one end links to each other with an end of resistance R 7; The other end of resistance R 7 links to each other with an end of resistance R 6, the normal phase input end of difference amplifier U1, the other end ground connection of resistance R 6, and the other end of sampling module links to each other with an end of resistance R 8; The other end of resistance R 8 links to each other with an end of resistance R 9, the inverting input of difference amplifier U1; The other end of R9 links to each other with the output terminal of difference amplifier U1, and the output terminal of difference amplifier U1 links to each other with an end of resistance R 10, and the other end of resistance R 10 links to each other with the normal phase input end of comparator U2, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3; The other end ground connection of resistance R 11 the other ends and capacitor C 3; The other end of resistance R 12 links to each other with the output terminal of comparator U2, and the reversed-phase output of comparator U2 links to each other with reference level Uc, and the output terminal of comparator U2 links to each other with an end of resistance R 13, an end of capacitor C 4, the input end of phase inverter U3; The other end of resistance R 13 links to each other with 5V voltage; The other end ground connection of capacitor C 4, the output terminal of phase inverter U3 links to each other with an end of controller pin 1, resistance R 14, the other end ground connection of resistance R 14; Overcurrent monitor signal signal Valve_S1 gets into controller pin 1 through the output terminal of phase inverter U3.
The circuit that described internal short circuit fault detects is: second sampling module, one end links to each other with an end of resistance R 16; The other end of resistance R 16 links to each other with an end of resistance R 15, the normal phase input end of difference amplifier U4; The other end ground connection of resistance R 15; The other end of sampling module links to each other with an end of resistance R 17, and the other end of resistance R 17 links to each other with an end of resistance R 18, the inverting input of difference amplifier U4, and the other end of R18 links to each other with the output terminal of difference amplifier U4; The output terminal of difference amplifier U4 links to each other with an end of resistance R 19; The other end of resistance R 19 links to each other with the normal phase input end of comparator U5, an end of resistance R 20, an end of resistance R 21, an end of capacitor C 6, the other end ground connection of resistance R 20 the other ends and capacitor C 6, and the other end of resistance R 21 links to each other with the output terminal of comparator U5; The reversed-phase output of comparator U5 links to each other with reference level Uc; The output terminal of comparator U5 links to each other with an end of resistance R 22, an end of capacitor C 7, the input end of phase inverter U6, and the other end of resistance R 22 links to each other with 5V voltage, the other end ground connection of capacitor C 7; The output terminal of phase inverter U6 links to each other with an end of controller pin 4, resistance R 23, the other end ground connection of resistance R 23; Overcurrent monitor signal signal Valve_S2 gets into controller pin 4 through the output terminal of phase inverter U6.
Described automobile-used solenoid valve failure diagnostic method is: before the input of control electromagnetic valve actuating signal; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve open circuit fault occurs; Controller stops solenoid valve when inferior driving if break down then, continuous 10 times the driving that open circuit faults then forever stop solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads the shorted to earth fault-detecting circuit from Check point P, the detected overcurrent monitor signal of Check point Q; Judge whether solenoid valve the shorted to earth fault occurs; If generation shorted to earth fault then controller stops solenoid valve when inferior driving, continuous 2 times the driving that the shorted to earth fault then forever stops solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads solenoid valve short trouble testing circuit from Check point B, the detected overcurrent monitor signal of Check point C; Judge whether solenoid valve short trouble occurs; If failed because then controller stops solenoid valve when inferior driving, if detect the driving that continuous 2 failed because of solenoid valve then forever stop solenoid valve; When solenoid valve begins to move; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve occurs the power supply short circuit fault; If take place to the power supply short circuit fault then controller stop solenoid valve when time driving, if detect the continuous driving that solenoid valve takes place the power supply short circuit fault is then forever stopped for 2 times of solenoid valve; Simultaneously; The shorted to earth fault-detecting circuit also can be used as solenoid valve reliability failure testing circuit; Controller reads from Check point P, the detected electromagnetic valve driving current characteristic of Check point Q; Judge whether solenoid valve reliability failure occurs, if take place the solenoid valve reliability failure then controller stop solenoid valve when time driving, if detect solenoid valve continuous 6 times the driving that reliability failure then forever stop solenoid valve taking place.
Compare with existing technology, beneficial effect of the present invention and advantage are: the present invention utilizes simple and effective hardware circuit design and software judgement efficiently, reaches the various Fault Diagnosis to automobile-used 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 diagnostic method of the present invention to carry out fault diagnosis to electric control fuel oil jet system reliably.Because hardware circuit is simple, cost is low.Because software overhead is little, increased the reliability of electrical control system for engine.In actual engineering application, can reach very considerable effect.
Description of drawings
Fig. 1 is automobile-used solenoid valve failure diagnosis apparatus circuit block diagram;
Fig. 2 is of the present invention opens circuit and to the power supply short circuit fault-detecting circuit;
Fig. 3 is a solenoid valve open circuit fault diagnostic flow chart of the present invention;
Fig. 4 is that electromagnetism of the present invention is to the power supply short circuit Troubleshooting Flowchart;
Fig. 5 is a shorted to earth fault-detecting circuit of the present invention;
Fig. 6 is internal short circuit fault testing circuit figure of the present invention;
Fig. 7 is a solenoid valve internal short circuit fault diagnostic flow chart of the present invention;
Fig. 8 is to be the electromagnetic valve driving current performance plot of example with the oil pump solenoid valve;
Fig. 9 is to be the solenoid valve reliability failure diagnostic flow chart of example with the oil pump solenoid valve.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
As shown in Figure 1, automobile-used solenoid valve failure diagnosis apparatus comprises controller, internal short circuit fault testing circuit, open circuit and to power supply short circuit fault-detecting circuit, shorted to earth fault-detecting circuit, power module, first sampling module, automobile-used solenoid valve, the first control switch M1 and second sampling module; Controller pin 1,2,3,4 respectively with shorted to earth fault-detecting circuit output terminal, open circuit and power supply short circuit fault-detecting circuit output terminal, the first control switch M1 input end, internal short circuit fault testing circuit output terminal linked to each other; Power module, first sampling module, automobile-used solenoid valve, the first control switch M1, second sampling module, Check point C connect in order; Shorted to earth fault-detecting circuit first input end is that Check point P links to each other, second input end is that Check point Q links to each other with the tie point of first sampling module and automobile-used solenoid valve with the tie point of the power module and first sampling module; Open circuit and be that Check point Q links to each other to the tie point of power supply short circuit fault-detecting circuit and the automobile-used solenoid valve and the first control switch M1, internal short circuit fault testing circuit first input end is that Check point B links to each other, second input end links to each other with Check point C with the tie point of the first control switch M1 and second sampling module; The control signal Valve_IN of controller pin 3 outputs is the PWM ripple; The switch of control metal-oxide-semiconductor M1; According to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2; Overcurrent monitor signal Valve_S1 gets into controller pin 1 through shorted to earth fault-detecting circuit output terminal, and overcurrent monitor signal Valve_S2 gets into controller pin 4 through internal short circuit fault testing circuit output terminal.The control signal Valve_IN of No. 3 interface outputs of controller is the PWM ripple, the switch of control metal-oxide-semiconductor M1.M1 opens, and supply voltage Vbat is loaded on the solenoid valve, 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.On the basis of this drive circuit, add two sampling resistors, 5 Check points.In conjunction with the testing circuit device; Check point P, Q can accomplish the detection of solenoid valve shorted to earth fault and reliability failure; Check point A can accomplish the solenoid valve open circuit fault and to the detection of power supply short circuit fault, Check point B, C can accomplish the detection of solenoid valve internal short circuit fault.
As shown in Figure 2; Open circuit and to the power supply short circuit fault-detecting circuit be: inductance L 1 one ends and resistance R 1 one ends are connected to form solenoid valve, and resistance R 1 the other end links to each other with driving voltage through resistance R 3, and inductance L 1 the other end links to each other with the D utmost point, resistance R 4 one ends of metal-oxide-semiconductor M1; The G utmost point of metal-oxide-semiconductor M1 links to each other with the pin 3 of controller; The S utmost point of metal-oxide-semiconductor M1 links to each other with Check point B, and the other end of resistance R 4 links to each other the other end ground connection of resistance R 5 with an end of the pin of controller 2, resistance R 5 and capacitor C 1, the anode of reference diode D1; The other end ground connection of C1, the plus earth of reference diode D1; The control signal Valve_IN of controller pin 3 output is the PWM ripple, the switch of control metal-oxide-semiconductor M1, according to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2.Before solenoid valve work, when promptly control switch M1 closes, acquisition of diagnostic feedback signal Valve_O.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 or the shorted to earth fault.After controller reads this signal, can carry out judgment processing by diagnosis algorithm.When solenoid valve begins work, when promptly control switch M1 opens, acquisition of diagnostic feedback signal Valve_O.When the signal that is input to controller is low level, show that solenoid valve is in normal state.Otherwise solenoid valve takes place the power supply short circuit fault.
As shown in Figure 3, solenoid valve open circuit fault diagnostic process is: before solenoid valve work, get into step S1, acquisition of diagnostic feedback signal Valve_O.Get into step S2 then, judge whether to break down.If fault-free then gets into step S6, return after the DTC zero clearing.Otherwise, getting into step S3, failure count adds 1, and controller stops when time driving.Then, get into step S4, judge whether continuous ten times and open circuit or the shorted to earth fault.If do not take place, then return.Otherwise entering step S5 opens circuit or the shorted to earth DTC puts 1.The back gets into step S7, and controller stops solenoid-driven fully.
As shown in Figure 4, electromagnetism to the power supply short circuit fault diagnosis flow scheme is: before solenoid valve work, get into step S8, acquisition of diagnostic feedback signal Valve_O.Get into step S9 then, judge whether to break down.If fault-free then gets into step S13, return after the DTC zero clearing.Otherwise, getting into step S10, failure count adds 1, and controller stops when time driving.Then, get into step S11, judge whether that continuous 4 generations are to the power supply short circuit fault.If do not take place, then return.Otherwise, get into step S12, the power supply short circuit DTC is put 1.The back gets into step S14, and controller stops solenoid-driven fully.
As shown in Figure 5; The shorted to earth fault-detecting circuit is: first sampling module, one end links to each other with an end of resistance R 7; The other end of resistance R 7 links to each other with an end of resistance R 6, the normal phase input end of difference amplifier U1, the other end ground connection of resistance R 6, and the other end of sampling module links to each other with an end of resistance R 8; The other end of resistance R 8 links to each other with an end of resistance R 9, the inverting input of difference amplifier U1; The other end of R9 links to each other with the output terminal of difference amplifier U1, and the output terminal of difference amplifier U1 links to each other with an end of resistance R 10, and the other end of resistance R 10 links to each other with the normal phase input end of comparator U2, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3; The other end ground connection of resistance R 11 the other ends and capacitor C 3; The other end of resistance R 12 links to each other with the output terminal of comparator U2, and the reversed-phase output of comparator U2 links to each other with reference level Uc, and the output terminal of comparator U2 links to each other with an end of resistance R 13, an end of capacitor C 4, the input end of phase inverter U3; The other end of resistance R 13 links to each other with 5V voltage; The other end ground connection of capacitor C 4, the output terminal of phase inverter U3 links to each other with an end of controller pin 1, resistance R 14, the other end ground connection of resistance R 14; Overcurrent monitor signal signal Valve_S1 gets into controller pin 1 through the output terminal of phase inverter U3.When solenoid valve is worked, through sampling resistor R3, monitoring overcurrent monitor signal Vavle_S1.If the shorted to earth fault appears in solenoid valve, then through the electric current moment increase of R3, R3 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 Vavle_S1 be high level then this moment, the shorted to earth fault 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 the solenoid valve reliability failure and detects.Reliability failure for solenoid valve detects, and only needs when timing begins, to change the dutycycle of pwm signal Valve_IN, obtains required reference level through the DA circuit.
As shown in Figure 6; The internal short circuit fault testing circuit is: second sampling module, one end links to each other with an end of resistance R 16; The other end of resistance R 16 links to each other with an end of resistance R 15, the normal phase input end of difference amplifier U4, the other end ground connection of resistance R 15, and the other end of sampling module links to each other with an end of resistance R 17; The other end of resistance R 17 links to each other with an end of resistance R 18, the inverting input of difference amplifier U4; The other end of R18 links to each other with the output terminal of difference amplifier U4, and the output terminal of difference amplifier U4 links to each other with an end of resistance R 19, and the other end of resistance R 19 links to each other with the normal phase input end of comparator U5, an end of resistance R 20, an end of resistance R 21, an end of capacitor C 6; The other end ground connection of resistance R 20 the other ends and capacitor C 6; The other end of resistance R 21 links to each other with the output terminal of comparator U5, and the reversed-phase output of comparator U5 links to each other with reference level Uc, and the output terminal of comparator U5 links to each other with an end of resistance R 22, an end of capacitor C 7, the input end of phase inverter U6; The other end of resistance R 22 links to each other with 5V voltage; The other end ground connection of capacitor C 7, the output terminal of phase inverter U6 links to each other with an end of controller pin 4, resistance R 23, the other end ground connection of resistance R 23; Overcurrent monitor signal signal Valve_S2 gets into controller pin 4 through the output terminal of phase inverter U6.When solenoid valve is worked, through sampling resistor R2, monitoring overcurrent monitor signal Vavle_S2.If short trouble appears in solenoid valve, then through the electric current moment increase of R2, R2 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 Vavle_S2 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.
As shown in Figure 7, solenoid valve internal short circuit fault diagnostic process is: for the diagnosis of solenoid valve short trouble, consider that this fault will in time obtain diagnostic feedback, can when software development, the mode that request is interrupted when short trouble takes place be set accomplish.When solenoid valve moved, if the solenoid valve failed because gets into step S15, failure count added 1, stopped solenoid valve when inferior driving.Then, get into step S16, whether failure judgement is counted greater than 2, if not then return.Otherwise, getting into step S17, DTC puts 1.Progressive then S18, controller is removed counting, stops each driving output of solenoid valve.
With the high pressure oil pump solenoid valve is that the electromagnetic valve driving current characteristic of example is seen Fig. 8.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 all need to 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.Drawing high time T 1 with detection is example, at the start time point that the software control electric current draws high, 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 R3, amplifier, comparator, and then driving current characteristic monitor signal Vavle_S1 produces an edge pulse at the terminating point that electric current rises, the stopping of triggering timing device.Catch the value of timer, be and draw high time T 1 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 9, be that the solenoid valve reliability failure diagnostic flow chart of example is with the oil pump solenoid valve: enable control signal Valve_IN at software and begin when effective, the timer of appointment brings into operation, i.e. step S19 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 Vavle_S1.Step S20 is time-delay wait routine, waiting step S21: 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 S22 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 S23 and returns 0, representes no reliability failure.If do not satisfy, then get into step S25 and return 1, reliability failure appears in expression, should stop the driving output of corresponding circuits, the Write fault sign indicating number.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 S24 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 1, whether can judge whether to accomplish faut detection greater than 7 according to Pcount.
The method for diagnosing faults of automobile-used solenoid valve is: before the input of control electromagnetic valve actuating signal; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve open circuit fault occurs; Controller stops solenoid valve when inferior driving if break down then, continuous 10 times the driving that open circuit faults then forever stop solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads the shorted to earth fault-detecting circuit from Check point P, the detected overcurrent monitor signal of Check point Q; Judge whether solenoid valve the shorted to earth fault occurs; If generation shorted to earth fault then controller stops solenoid valve when inferior driving, continuous 2 times the driving that the shorted to earth fault then forever stops solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads solenoid valve short trouble testing circuit from Check point B, the detected overcurrent monitor signal of Check point C; Judge whether solenoid valve short trouble occurs; If failed because then controller stops solenoid valve when inferior driving, if detect the driving that continuous 2 failed because of solenoid valve then forever stop solenoid valve; When solenoid valve begins to move; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve occurs the power supply short circuit fault; If take place to the power supply short circuit fault then controller stop solenoid valve when time driving, if detect the continuous driving that solenoid valve takes place the power supply short circuit fault is then forever stopped for 2 times of solenoid valve; Simultaneously; The shorted to earth fault-detecting circuit also can be used as solenoid valve reliability failure testing circuit; Controller reads from Check point P, the detected electromagnetic valve driving current characteristic of Check point Q; Judge whether solenoid valve reliability failure occurs, if take place the solenoid valve reliability failure then controller stop solenoid valve when time driving, if detect solenoid valve continuous 6 times the driving that reliability failure then forever stop solenoid valve taking place.
Claims (5)
1. automobile-used solenoid valve failure diagnosis apparatus is characterized in that comprising controller, internal short circuit fault testing circuit, opens circuit and to power supply short circuit fault-detecting circuit, shorted to earth fault-detecting circuit, power module, first sampling module, automobile-used solenoid valve, the first control switch M1 and second sampling module; Controller pin 1,2,3,4 respectively with shorted to earth fault-detecting circuit output terminal, open circuit and power supply short circuit fault-detecting circuit output terminal, the first control switch M1 input end, internal short circuit fault testing circuit output terminal linked to each other; Power module, first sampling module, automobile-used solenoid valve, the first control switch M1, second sampling module, Check point C connect in order; Shorted to earth fault-detecting circuit first input end is that Check point P links to each other, second input end is that Check point Q links to each other with the tie point of first sampling module and automobile-used solenoid valve with the tie point of the power module and first sampling module; Open circuit and be that Check point Q links to each other to the tie point of power supply short circuit fault-detecting circuit and the automobile-used solenoid valve and the first control switch M1, internal short circuit fault testing circuit first input end is that Check point B links to each other, second input end links to each other with Check point C with the tie point of the first control switch M1 and second sampling module; The control signal Valve_IN of controller pin 3 outputs is the PWM ripple; The switch of control metal-oxide-semiconductor M1; According to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2; Overcurrent monitor signal Valve_S1 gets into controller pin 1 through shorted to earth fault-detecting circuit output terminal, and overcurrent monitor signal Valve_S2 gets into controller pin 4 through internal short circuit fault testing circuit output terminal.
2. a kind of automobile-used solenoid valve failure diagnosis apparatus according to claim 1; It is characterized in that describedly opening circuit and to the power supply short circuit fault-detecting circuit being: inductance L 1 one ends and resistance R 1 one ends are connected to form solenoid valve; Resistance R 1 the other end links to each other with driving voltage Vbat through resistance R 3; Inductance L 1 the other end links to each other with the D utmost point, resistance R 4 one ends of metal-oxide-semiconductor M1, and the G utmost point of metal-oxide-semiconductor M1 links to each other with the pin 3 of controller, and the S utmost point of metal-oxide-semiconductor M1 links to each other with Check point B; The other end of resistance R 4 links to each other with an end of the pin of controller 2, resistance R 5 and capacitor C 1, the anode of reference diode D1; The other end ground connection of resistance R 5, the other end ground connection of C1, the plus earth of reference diode D1; The control signal Valve_IN of controller pin 3 output is the PWM ripple, the switch of control metal-oxide-semiconductor M1, according to the diagnostic feedback signal Valve_O of hardware circuit collection through opening circuit and power supply short circuit fault-detecting circuit output terminal being got into controller pin 2.
3. a kind of automobile-used solenoid valve failure diagnosis apparatus according to claim 1; The circuit that it is characterized in that described shorted to earth faut detection is: first sampling module, one end links to each other with an end of resistance R 7; The other end of resistance R 7 links to each other with an end of resistance R 6, the normal phase input end of difference amplifier U1, the other end ground connection of resistance R 6, and the other end of sampling module links to each other with an end of resistance R 8; The other end of resistance R 8 links to each other with an end of resistance R 9, the inverting input of difference amplifier U1; The other end of R9 links to each other with the output terminal of difference amplifier U1, and the output terminal of difference amplifier U1 links to each other with an end of resistance R 10, and the other end of resistance R 10 links to each other with the normal phase input end of comparator U2, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3; The other end ground connection of resistance R 11 the other ends and capacitor C 3; The other end of resistance R 12 links to each other with the output terminal of comparator U2, and the reversed-phase output of comparator U2 links to each other with reference level Uc, and the output terminal of comparator U2 links to each other with an end of resistance R 13, an end of capacitor C 4, the input end of phase inverter U3; The other end of resistance R 13 links to each other with 5V voltage; The other end ground connection of capacitor C 4, the output terminal of phase inverter U3 links to each other with an end of controller pin 1, resistance R 14, the other end ground connection of resistance R 14; Overcurrent monitor signal signal Valve_S1 gets into controller pin 1 through the output terminal of phase inverter U3.
4. a kind of automobile-used solenoid valve failure diagnosis apparatus according to claim 1; It is characterized in that the circuit that described internal short circuit fault detects is: second sampling module, one end links to each other with an end of resistance R 16; The other end of resistance R 16 links to each other with an end of resistance R 15, the normal phase input end of difference amplifier U4, the other end ground connection of resistance R 15, and the other end of sampling module links to each other with an end of resistance R 17; The other end of resistance R 17 links to each other with an end of resistance R 18, the inverting input of difference amplifier U4; The other end of R18 links to each other with the output terminal of difference amplifier U4, and the output terminal of difference amplifier U4 links to each other with an end of resistance R 19, and the other end of resistance R 19 links to each other with the normal phase input end of comparator U5, an end of resistance R 20, an end of resistance R 21, an end of capacitor C 6; The other end ground connection of resistance R 20 the other ends and capacitor C 6; The other end of resistance R 21 links to each other with the output terminal of comparator U5, and the reversed-phase output of comparator U5 links to each other with reference level Uc, and the output terminal of comparator U5 links to each other with an end of resistance R 22, an end of capacitor C 7, the input end of phase inverter U6; The other end of resistance R 22 links to each other with 5V voltage; The other end ground connection of capacitor C 7, the output terminal of phase inverter U6 links to each other with an end of controller pin 4, resistance R 23, the other end ground connection of resistance R 23; Overcurrent monitor signal signal Valve_S2 gets into controller pin 4 through the output terminal of phase inverter U6.
5. one kind is used the method for diagnosing faults of the automobile-used solenoid valve of system according to claim 1; It is characterized in that: before the input of control electromagnetic valve actuating signal; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve open circuit fault occurs, controller stops solenoid valve when inferior driving if break down then, continuous 10 times the driving that open circuit faults then forever stop solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads the shorted to earth fault-detecting circuit from Check point P, the detected overcurrent monitor signal of Check point Q; Judge whether solenoid valve the shorted to earth fault occurs; If generation shorted to earth fault then controller stops solenoid valve when inferior driving, continuous 2 times the driving that the shorted to earth fault then forever stops solenoid valve taking place if detect solenoid valve; When solenoid valve begins to move; Controller reads solenoid valve short trouble testing circuit from Check point B, the detected overcurrent monitor signal of Check point C; Judge whether solenoid valve short trouble occurs; If failed because then controller stops solenoid valve when inferior driving, if detect the driving that continuous 2 failed because of solenoid valve then forever stop solenoid valve; When solenoid valve begins to move; Controller read open circuit and to the power supply short circuit fault-detecting circuit from the detected diagnostic feedback signal of Check point A; Judge whether solenoid valve occurs the power supply short circuit fault; If take place to the power supply short circuit fault then controller stop solenoid valve when time driving, if detect the continuous driving that solenoid valve takes place the power supply short circuit fault is then forever stopped for 2 times of solenoid valve; Simultaneously; The shorted to earth fault-detecting circuit also can be used as solenoid valve reliability failure testing circuit; Controller reads from Check point P, the detected electromagnetic valve driving current characteristic of Check point Q; Judge whether solenoid valve reliability failure occurs, if take place the solenoid valve reliability failure then controller stop solenoid valve when time driving, if detect solenoid valve continuous 6 times the driving that reliability failure then forever stop solenoid valve taking place.
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| CN2011103272790A CN102410122A (en) | 2011-10-25 | 2011-10-25 | Fault diagnosis device and method for vehicle solenoid valve |
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| CN2011103272790A CN102410122A (en) | 2011-10-25 | 2011-10-25 | Fault diagnosis device and method for vehicle solenoid valve |
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Application publication date: 20120411 |