CN1292160C - Fault detecting circuit of fuel injection device - Google Patents
Fault detecting circuit of fuel injection device Download PDFInfo
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- CN1292160C CN1292160C CN 02126425 CN02126425A CN1292160C CN 1292160 C CN1292160 C CN 1292160C CN 02126425 CN02126425 CN 02126425 CN 02126425 A CN02126425 A CN 02126425A CN 1292160 C CN1292160 C CN 1292160C
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- circuit
- switch element
- electromagnetic coil
- fuel injection
- fault
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
- F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
A failure detection circuit for a fuel injection system comprises a common switching element 11 or 21 for feeding solenoid valve driving electromagnetic coils 5 and 8, or 6 and 7 of groups discontinuous in fuel injection order, individual switching elements 13, 14, 23 and 24 related to the electromagnetic coils 5 to 8, and off-surge detection circuits 35 and 36 for forming a logical sum of off-surge signals Vs generated at a power interruption to electromagnetic coils of different groups. According to a drop determination and an overlap determination of off-surge signals corresponding to a driving signal pulse train generated by a microprocessor, the output of driving signal pulses to the electromagnetic coils 5 to 8 is stopped to disconnect the common switching element 11 or 12. The invention provided a simple failure detection circuit for a fuel injection system that can ensure a turnout operation by detecting each phase anomaly and interphase short circuit anomaly in a drive circuit of a solenoid valve for fuel injection in each cylinder of a multicylinder engine.
Description
Technical field
The present invention relates to the fault-detecting circuit of the fuel injection system of vehicle-mounted multicylinder engine etc., particularly relate to and detect driving fuel and spray broken string with the driving element of broken string, short circuit and the electromagnetic coil of the electromagnetic coil of solenoid valve and distribution, short circuit etc. to carry out abnormal alarm, demonstration fault-detecting circuit with the fuel injection system that carries out emergency operation (escapingoperation).
Background technique
The quick overexcitation of general use is controlled and is utilized the action retentive control of light current to come controlling and driving fuel to spray the electromagnetic coil of using solenoid valve, thereby improves the responsiveness and the inhibition temperature rise of solenoid valve.In conventional method, by the voltage of each one of electromagnetic coil driving circuit, the monitoring of electric current are detected the broken string and the short trouble of electromagnetic coil, distribution, switching element etc.In addition, be known that and the fault detection signal for the multichannel load is carried out logic and handle to simplify signal processing.
Japanese kokai publication hei 10-257799 communique " the output open circuit detection device of multichannel output unit " has shown such notion, that is: for multichannel load as field coil of stepper motor and so on, when the non-driving of load, supply with Weak current to load, make the load circuit broken string, the load both end voltage rises, and detects broken string by this rising.The short-circuit detecting of load though do not touch upon, it has disclosed such conception of species, that is: use diode OR circuit that the burn out detection signal is supplied with the public circuit that compares to determine.
On the contrary, Japanese kokai publication sho 62-290111 communique " fault-detecting circuit of fuel injection valve for IC engines drive circuit " has shown such notion, that is: drive the open circuit surge voltage that when energising is opened circuit, takes place with electromagnetic coil by detecting Fuelinjection nozzle, come the broken string and the short trouble of batch detection electromagnetic coil, distribution and switching element etc.
Japanese kokai publication hei 9-112735 communique " electromagnetic valve actuator " has shown such notion: about spray the driving electromagnetic coil with solenoid valve as fuel, the dry circuit of fast driving with booster circuit and maintenance effect is set, the charging voltage by the capacitor of monitoring in the booster circuit and broken string that discharge voltage detects a plurality of electromagnetic coils and distribution and short circuit etc.
In this example, particularly also shown a such notion, a plurality of Fuelinjection nozzles have been driven divide into groups, carried out emergency operation reposefully according to the fault judgement result with electromagnetic coil.
In addition, Japanese kokai publication hei 10-318025 communique " fuel sprays the control gear with sparger " has shown such notion: fuel injection sequence be separated by more than two strokes and current"on"time nonoverlapping a plurality of injector coil an end be connected with public driving output circuit, each switch gear that carries out ON/OFF on the energising sequential of the other end and each injector coil is connected, to realize switch control.
Japanese kokai publication hei 12-380652 communique " abnormal detecting device of onboard electrical load driving system " provides a kind of like this method, at microprocessor internal the anomaly detection signal of logic and processing is separated detection that is:.Also used this notion in the present invention.
Summary of the invention
In above-mentioned background technique, pointed out the method for detecting abnormality of the whole bag of tricks such as broken string about the switch control unit of broken string, short circuit and this electromagnetic coil of electrical loads such as electromagnetic coil and distribution, short circuit.
But, any technology no matter in the past, all exist such problem: for a plurality of electrical loads comprise phase fault and ground connection etc. unusual set various unusual, in system, also do not constitute the fault-detecting circuit that carries out abnormality juding.
The present invention is for addressing the above problem and provide the device of following in faut detection that comprises the countermeasure processing method to produce, and its purpose particularly is to provide the phase fault that respectively reaches unusually mutually that can spray the fuel of each cylinder of multicylinder engine with the drive circuit of solenoid valve to detect fault-detecting circuit with the easy fuel injection system that carries out emergency operation unusually.
The fault-detecting circuit of fuel injection system of the present invention comprises:
Driving is sprayed a plurality of electromagnetic coils of using solenoid valve for the fuel of each cylinder of multicylinder engine;
Produce the microprocessor of drive signal impulse row and quick overexcitation control signal;
Drive signal impulse row according to producing from described microprocessor drive a plurality of independent switch elements that described a plurality of electromagnetic coil carries out switch motion successively;
According to the quick overexcitation control signal that produces from described microprocessor, at least by the fuel injection sequence many groups common switch element that electromagnetic coil in one group that two a plurality of electromagnetic coils more than the stroke form carries out the integral feed driving of being separated by;
At least a plurality of open circuit surge voltage testing circuits of detecting of the open circuit surge voltage that produces to independent switch element open circuit that on the same group electromagnetic coil is not corresponding the time,
Described microprocessor compares the testing signal that produces from described a plurality of open circuit surge voltage testing circuits, has or not disappearance and repeats to judge unusual according to this testing signal.
In addition, whether the described surge voltage testing circuit of respectively opening a way has surpassed the magnitude of voltage of voltage source by means of the both end voltage value that detects described independent switch element when the described independent switch element open circuit, detects described open circuit surge voltage.
In addition, the described surge voltage testing circuit of respectively opening a way, whether the terminal voltage of the negative terminal of described electromagnetic coil is higher than the voltage of the feed end that is connected with described public switch element during by means of described independent switch element of detection and described common switch element open circuit, detects described open circuit surge voltage.
In addition, the fault-detecting circuit of fuel injection system of the present invention also comprises:
Logic and circuit, to carrying out logic and processing by testing signal for the open circuit surge voltage testing circuit output of the electromagnetic coil of the different group of described common switch element,
Described microprocessor is judged according to the output of described logic and circuit unusually.
In addition, described each common switch element is corresponding to moving from the quick overexcitation control signal of described microprocessor and the light current retentive control signal that is used to keep described electromagnetic coil to move.
In addition, the fault-detecting circuit of fuel injection system of the present invention also comprises:
The overexcitation booster circuit that supply voltage is boosted,
Described common switch element, form by high side switch element and low voltage terminal switching element, the high side switch element carries out feed by described overexcitation booster circuit to described electromagnetic coil and drives, the low voltage terminal switching element keeps the light current retentive control signal of described electromagnetic coil action to move corresponding to being used to, and drives described electromagnetic coil is carried out feed.
In addition, described high side switch element share described overexcitation booster circuit, and described overexcitation is public with booster circuit to all electromagnetic coils.
In addition, the fault-detecting circuit of fuel injection system of the present invention also comprises:
Described microprocessor is being judged to be according to the testing signal that is produced by described open circuit surge testing circuit when unusual, and the group that the common switch element of correspondence and the independent switch element that be connected in series with this common switch element the are cut off shut-off means of switching on is provided,
Utilization is carried out emergency operation with the group electromagnetic coil in addition that described independent switch element cuts off.
In addition, described microprocessor is judged to be when unusual in the disappearance according to described open circuit surge voltage, if there have have the current"on"time of electromagnetic coil successively to be overlapping, then to shortening current"on"time of described drive signal impulse row processing.
In addition, the fault-detecting circuit of fuel injection system of the present invention also comprises anomaly alarming device, receive abnormal signal and report to the police unusual,
Described microprocessor is being judged to be according to the testing signal that is produced by described open circuit surge voltage testing circuit when unusual, to described anomaly alarming device output abnormality signal.
In addition, described microprocessor has the interface circuit that is connected usefulness with external tool.
Description of drawings
Fig. 1 represents the detailed circuit diagram of the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Fig. 2 represents the fragmentary detail view of the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Fig. 3 represents the cylinder allocation plan of the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Sequential chart when Fig. 4 represents proper functioning in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Schematic block diagram in Fig. 5 represents in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1 mutually when unusual.
Fig. 6 represents that the faut detection of the fuel injection system relevant with the invention process form 1 measures the sequential chart when ground connection is unusual in the road.
Schematic block diagram when Fig. 7 represents that phase fault is unusual in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Sequential chart when Fig. 8 represents that phase fault is unusual in the group in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Fig. 9 represents the sequential chart of the outer alternate short circuit of group in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Figure 10 represents working timing figure in the fault-detecting circuit of the fuel injection system relevant with the invention process form 1.
Figure 11 represents the detailed circuit diagram of the fault-detecting circuit in the fuel injection system relevant with the invention process form 2.
Figure 12 represents the detailed circuit diagram of the fault-detecting circuit of the fuel injection system relevant with the invention process form 3.
Label declaration
1 fuel injection control system, 2 power switches, 3 voltage sources, 4 sensor groups, 5～8 electromagnetic coils, 9 microprocessors, 10 the 1st Drive and Control Circuit, 11 common switch elements, 11a high voltage terminal common switch element, 11b low voltage terminal common switch element, the 11c booster circuit, 11d common boosted circuit, 12 change of current diodes, 12a pull down resistor, 13,14 independent switch elements, 13a, the 14a reference diode, 13b, 14b open circuit surge voltage detects uses diode, 13c, 13d, 14c, the 14d divider resistance, 15 current sense resistors, 16,17 logics and device, 18 logic product devices, 19 light current retentive control circuit, 20 the 2nd Drive and Control Circuit, 21 common switch elements, a 21a high voltage terminal switching element, 21b low voltage terminal common switch element, the 21c booster circuit, 22 change of current diodes, 23,24 independent switch elements, 23b, 24b open circuit surge voltage detects uses diode, 23c, 23d, 24c, the 24d divider resistance, 25 current sense resistors, 26,27 logics and device, 28 logic product devices, 29 light current retentive control circuit, 31～34 diodes, 35 open circuit surge voltage testing circuits, the 35a comparison circuit, 35b, the 35c divider resistance, 36 open circuit surge voltage testing circuits, 36a comparison circuit, 36b, the 36c divider resistance, 37,38 logics and device, 39 open circuit surge voltage testing circuits, 40 external tools, 41 interface circuits, 42 abnormal alarm display unit, 43～46 comparison circuits, 50 bent axles, 51～54 cylinders, 60 ground connection, 61 load short circuits, 62～64 broken string loops, 65 abnormal current waveforms, 66 repeat current waveform, the surge voltage of 67 disappearances, the signal of 68 disappearances, 70,71 phase faults, 72 abnormal current waveforms, 73,74 repeat current waveform, 75 abnormal current waveforms, 76,77 repeat surge voltage, 78,79 duplicate detection signals, 80 decay current waveforms, the surge voltage of 81 disappearances, the signal of 82 disappearances.
Embodiment
Example 1
Fig. 1 has provided the detailed circuit diagram about the fault-detecting circuit of the fuel injection system of the invention process form 1.Be illustrated with regard to its structure below.
Among Fig. 1, fuel injection control system 1 mainly is made of microprocessor the 9, the 1st Drive and Control Circuit 10 described later and the 2nd Drive and Control Circuit 20.Power switch 2 is connected between voltage sources 3 such as on-vehicle battery and the above-mentioned fuel injection system 1.
The sequential of decision combustion jet and the sensor group 4 of emitted dose usefulness such as (discharge times) are made up of crank angle sensor, cam angle sensor and throttle valve opening sensor etc.Supply with above-mentioned microprocessor 9 by the input signal that this sensor group 4 produces.
The the 1st to the 4th electromagnetic coil 5～8 is by the above-mentioned the 1st and the 2nd Drive and Control Circuit 10,20 drive controlling.Electromagnetic coil 5～8th, be arranged on Fuelinjection nozzle motor each cylinder on shown in Figure 3 for aftermentioned carries out switch control usefulness.
The following describes the structural element of above-mentioned the 1st Drive and Control Circuit 10.Common switch element 11 is for being connected an end of above-mentioned the 1st, the 4th electromagnetic coil 5,8 and the transistor between the above-mentioned voltage source 3 etc.Change of current diode 12 is connected between the negative terminal of the load end of common switch element 11 and voltage source 3.Independent switch element 13 is connected with the other end of the above-mentioned the 1st electromagnetic coil 5, and this independent switch element 13 is for the closed transistor of the drive signal SW1 of above-mentioned microprocessor 9 outputs etc.Equally, independent switch element 14 is connected with the other end of the above-mentioned the 4th electromagnetic coil 8, and this independent switch element 14 is with the closed circuit transistor of the drive signal SW3 of above-mentioned microprocessor 9 outputs etc.
Logic and device 17 are imported above-mentioned logical product element 18 with above-mentioned drive signal SW1, SW3 as input signal.Light current retentive control circuit 19 is supplied with the light current ON/OFF control circuit of (action keeps using light current) for the action that keeps the 1st (or 4th) electromagnetic coil 5 (or 8).For this reason, when light current retentive control circuit 19 both end voltage at above-mentioned current sense resistor 15 were lower than specified value, output light current retentive control signal DT13 made 11 conductings of common switch element by above-mentioned logic product device 18 and logic and device 16.
As the structural element of above-mentioned the 2nd Drive and Control Circuit 20,21～29 is identical with above-mentioned 11～19.SW4 is equivalent to SW1.SW2 is equivalent to SW3.INJ2 represents the electromagnetic coil suitable with INJ1.INJ3 represents the electromagnetic coil suitable with INJ4.Here no longer add to have illustrated.
Open circuit surge voltage testing circuit 35 contains comparison circuit 35a.The voltage that divider resistance 35b, 35c will be fed out by the negative pole of above-mentioned diode 31,33 carries out dividing potential drop.Open circuit surge voltage testing circuit 36 contains not shown comparison circuit 36a.The voltage that not shown divider resistance 36b, 36c will be fed out by the negative pole of above-mentioned diode 34,32 carries out dividing potential drop.
Here, above-mentioned comparison circuit 35a has been made such structure: during greater than the voltage of voltage source 3, produce the testing signal IN13 of logic level " L " through the branch pressure voltage of divider resistance 35b, 35c dividing potential drop, supply with above-mentioned microprocessor 9.Equally, above-mentioned comparison circuit 36a during greater than the voltage of voltage source 3, producing the testing signal IN42 of logic level " L " through the branch pressure voltage of divider resistance 36b, 36c dividing potential drop, supplies with above-mentioned microprocessor 9.
External tool 40 can write control program to above-mentioned microprocessor 9, can read and show the content of not shown data storage.Interface circuit 41 is arranged between external tool 40 and the above-mentioned microprocessor 9.Abnormal alarm display unit 42 drives according to abnormal signal of above-mentioned microprocessor 9 etc.
Fig. 2 shows the partial detailed figure about the feed circuit corresponding with the 1st electromagnetic coil 5 among Fig. 1.Below structure is illustrated.
Among Fig. 2, pull down resistor 12a is in parallel with above-mentioned change of current diode 12. Reference diode 13a, 14a can the equivalent OFF voltage limitation functions of carrying out independent switch element 13,14.It is the electric current that flows through on the 1st electromagnetic coil 5 that action keeps with light current Ih.
Open circuit surge voltage Vs takes place when common switch element 11 and independent switch element 13 are all opened a way.This open circuit surge voltage Vs is produced by the counterelectromotive force that the 1st electromagnetic coil 5 is used to keep the action just flow through to keep taking place with light current Ih, and its value equates substantially with the deboost of above-mentioned equivalent reference diode 13a.
But this open circuit surge voltage Vs servo-actuated is done to keep descending rapidly with the decay of light current Ih.Determine to become Vs=0 behind the voltage by pull down resistor 12a.
When causing independent switch element 13 not open a way owing to the unusual grade of the short circuit of independent switch element 13, common switch element 11 is by feed, because the structure of the converter circuit that change of current diode 12 and independent switch element 13 are formed, so field coil is fast shut-off not, surge voltage Vs does not therefore open a way.
On the other hand, independent switch element 13 is in when open circuit, for to the 4th electromagnetic coil 8 feeds, and 14 conductings of independent switch element, common switch element 11 is activated.Produced the feed voltage Vb of the output terminal of common switch element 11, as the output of diode 31, Vb shows as the open circuit surge voltage Vs of apparent.But actual open circuit surge voltage Vs is than the also big (Vb＜Vs) of feed voltage Vb.So can separate by above-mentioned comparison circuit 35a and extract these voltages out.
Fig. 3 is the cylinder allocation plan of the fault-detecting circuit of fuel injection system shown in Figure 1.Among Fig. 3,50 is the bent axle of motor, and 51～54 for being carried out the 1st to the 4th cylinder that fuel sprays by above-mentioned electromagnetic coil 5～8.
In the 1st moment, independent switch element 13 and common switch element 11 move, and realize spraying for the fuel of the 1st cylinder 51 by the 1st electromagnetic coil 5 being carried out feed.Then, in the 2nd moment, independent switch element 24 and common switch element 21 move, by the 3rd electromagnetic coil 7 feeds being realized the fuel injection for the 3rd cylinder 53.Thereafter in the 3rd moment, independent switch element 14 and common switch element 11 move, by the 4th electromagnetic coil 8 feeds being realized the fuel injection to the 4th cylinder 54.And then in the 4th moment, independent switch element 23 and common switch element 21 move, by the 2nd electromagnetic coil 6 feeds being realized the fuel injection to the 2nd cylinder 52.
In above-mentioned this assortment, when spraying, the wherein some fuel of the 1st cylinder 51 or the 4th cylinder 54 becomes when unusual, and the 1st cylinder 51 and the 4th cylinder 54 are all stopped.At this, a kind of stable reply means are only to carry out emergency operation by the 2nd cylinder 52 and the 3rd cylinder 53.Become when unusual when the wherein some fuel of the 2nd cylinder 52 or the 3rd cylinder 53 sprays, the 2nd cylinder 52 and the 3rd cylinder 53 are all stopped.At this, a kind of stable reply means are only to carry out emergency operation by the 1st cylinder 51 and the 4th cylinder 54.Common switch element 11 and 21 among Fig. 1 is configured to corresponding to this grouping.
The drive signal SW1 of the microprocessor 9 among Fig. 1～SW4 adopts and is numbered according to fuel injection sequence.
Fig. 4 is the sequential chart about the regular event explanation usefulness of the fault-detecting circuit of the fuel injection system of this example 1.Among Fig. 4, Fig. 4 (a) is the output characteristics of the quick overexcitation control signal SW13 of microprocessor 9, Fig. 4 (b) is the output characteristics of light current retentive control signal DT13, Fig. 4 (c) is the output characteristics of the drive signal SW1 of microprocessor 9, Fig. 4 (d) is the output characteristics of the drive signal SW3 of microprocessor 9, Fig. 4 (e) is the output characteristics of the quick overexcitation control signal SW42 of microprocessor 9, Fig. 4 (f) is the output characteristics of light current retentive control signal DT42, Fig. 4 (g) is the output characteristics of the drive signal SW4 of microprocessor 9, and Fig. 4 (h) is the output characteristics of the drive signal SW2 of microprocessor 9.
Above-mentioned drive signal SW1～SW4 produces output in order.Overexcitation signal SW13 produces the output signal of short time according to the output timing of drive signal SW1 and SW3 fast.Overexcitation signal SW42 produces the output signal of short time according to the output timing of drive signal SW4 and SW2 equally, fast.
Fig. 4 (i) is the current waveform of the 1st electromagnetic coil 5, and Fig. 4 (a) and (b), (c) are obtained after synthesizing.Equally, Fig. 4 (j) is the current waveform of the 4th electromagnetic coil 8, and Fig. 4 (a) and (b), (d) are obtained after synthesizing.Fig. 4 (k) is the current waveform of the 2nd electromagnetic coil 6, and Fig. 4 (e), (f), (g) are obtained after synthesizing.Fig. 4 (1) is the current waveform of the 3rd electromagnetic coil 7, and Fig. 4 (e), (f), (h) are obtained after synthesizing.
Fig. 4 (m) is the output waveform of diode 31.When the 1st electromagnetic coil 5 failures of current of Fig. 4 (i), when the output that is the drive signal SW1 of Fig. 4 (c) stops (logic level " L "), produce open circuit surge voltage Vs, when 8 energisings of the 4th electromagnetic coil, according to the switch motion of common switch element 11, produce the waveform of feed voltage Vb.
Equally, Fig. 4 (n) is the output waveform of diode 34.Fig. 4 (o) is the output waveform of diode 32.Fig. 4 (p) is the output waveform of diode 33.
Fig. 4 (q) is the waveform of testing signal IN13.When diode 31,33 output open circuit surge voltage Vs, the IN13 of Fig. 4 (q) is logic level " L ".Equally, Fig. 4 (r) is the waveform of testing signal IN42.When diode 34,32 output open circuit surge voltage Vs, the IN42 of Fig. 4 (r) is logic level " L ".
The following describes the concrete faut detection of the fault-detecting circuit of the fuel injection control system in this example 1.Fig. 5 is about unusual schematic block diagram in mutually.Ground connection 60 has provided the state that the negative terminal of the 1st electromagnetic coil 5 is connected with the negative terminal of voltage source 3.When the ground connection of this state was taken place, the electric current that flows through on the electromagnetic coil 5 can not end fast, and open circuit surge voltage Vs does not take place.
This phenomenon is identical with the short circuit abnormal case of independent switch element 13.Even cut off feeds by common switch element 11, by change of current diode 12 and ground circuit 60 or short circuit the independent switch element, field current refluxes, and therefore open circuit surge voltage Vs no longer takes place.
Load short circuits 61 has provided the state of short circuit between the positive and negative terminal of the 4th electromagnetic coil 8.When this load short circuits 61 takes place when, on electromagnetic coil 8, no longer flow through field current, therefore when independent switch element 14 open circuits, the surge voltage of not opening a way Vs.
In addition; when load short circuits, independent switch element 13,14,23,24 and common switch element 11,21 are protected at short notice owing to the excess current protective function of himself; remove the drive instruction signal by microprocessor 9 immediately, protect it not to be subjected to scaling loss thus.
62～64 have provided the broken string open circuit.When situations such as generation distribution broken string, coil breakage and switching element open fault, field current is no longer by electromagnetic coil 6,7.During independent switch element 23,24 open circuits, open circuit surge voltage Vs no longer takes place.
Fig. 6 is the sequential chart that the action specification when ground connection is unusual among Fig. 5 is used.Below the different place of sequential chart of main explanation and regular event shown in Figure 4.
Abnormal current waveform 65 expression of Fig. 6 (i) INJ1 because of ground connection 60 on current sense resistor 15 (with reference to Fig. 1) by field current for the 1st electromagnetic coil 5, do not keep current waveform thereby do not move with the light current drive controlling.The 4th electromagnetic coil 8 that repeats current waveform 66 expression electric currents and Fig. 6 (j) INJ4 is basic identical, and the electric current that did not flow through on the 1st electromagnetic coil 5 of ground connection originally owing to the action of common switch element 11 becomes the state that flows through.
The surge voltage 67 of the disappearance of Fig. 6 (m) D31 has provided because of ground connection 60 makes the field current of the 1st electromagnetic coil 5 does not end fast, makes the open circuit surge voltage Vs that should take place originally thus and the situation that do not have to take place.The signal 68 of the disappearance of Fig. 6 (q) IN13 has provided the state that does not have the testing signal that should produce originally because of the relation of the surge voltage 67 of above-mentioned disappearance.
As mentioned above, when the disappearance that detects by the various open circuit surge voltage Vs that cause unusually in mutually, shown in Figure 10 as described later, the common switch element of disappearance phase or all independent switch elements that are connected in series with this common switch element all cut off.Realize spraying by the electromagnetic coil of left group as the fuel of emergency operation.
But when both sides' group was all opened a way the disappearance of surge voltage Vs, all switching elements were cut off, and motor can not turn round.
Fig. 7 is about alternate unusual schematic block diagram.Among Fig. 7, phase fault 70 has provided the state of short circuit between the negative terminal of the 1st and the 4th electromagnetic coil 5,8.Phase fault 71 has provided the state of short circuit between the negative terminal of the 2nd and the 4th electromagnetic coil 6,8.Above-mentioned phase fault 70 is phase fault in the group that takes place between the electromagnetic coil that is driven by identical common switch element 11, phase fault between the group that takes place between the electromagnetic coil of the common switch element drives that above-mentioned phase fault 71 is served as reasons different.
Fig. 8 is the sequential chart that the action specification when phase fault is unusual in the group among Fig. 7 is used.Below the sequential chart place inequality of main explanation and regular event shown in Figure 4.
The abnormal current waveform 72,75 of Fig. 8 (i) INJ1, (j) INJ4 provided because of phase fault 70 make the 1st, the 4th electromagnetic coil 5,8 in parallel cause moving keep the state that reduces by half with light current Ih.
The repetition current waveform 73,74 of Fig. 8 (i), (j) causes the unnecessary repetition current waveform that should not flow through originally for make 5,8 parallel connections of the 1st, the 4th electromagnetic coil because of phase fault 70.
Fig. 9 is the sequential chart that the action specification the when phase fault between group is unusual among Fig. 7 is used.Below the difference of main explanation and the sequential chart of regular event shown in Figure 4.
In the phase fault of the such leap group of phase fault 71, when all independent switch elements 13,14,23,24 are in each other not the state of conducting simultaneously (the fuel injection time cycle is shorter), each electromagnetic coil 5～8 all is subjected to normal control, carries out the action identical with Fig. 4 sequential chart.But different is for not detecting the unusual state of phase fault.
In contrast, it is long that Fig. 9 shows fuel injection time, the sequential chart the during conducting simultaneously of adjacent sequenced electromagnetic coil.
The state that the action maintenance that the decay current waveform 80 expression independent switch elements 14 of Fig. 9 (j) INJ4 and common switch element 11 open circuit backs are flow through on the 4th electromagnetic coil 8 decays by change of current diode 12, phase fault switch 71 and independent switch element 23 with light current Ih.The state that surge voltage 81 expressions of the disappearance of Fig. 9 (n) D34 or not by the feasible open circuit surge voltage Vs that should take place originally of fast shut-off because of the 4th electromagnetic coil 8.Equally, the state that or not of the signal 82 of the disappearance of Fig. 9 (r) IN42 expression testing signal that should take place originally because of the surge voltage 81 of above-mentioned disappearance makes.
Unusually there are 4 kinds about the phase fault between the leap group of the negative terminal of above-mentioned electromagnetic coil configuration.But no matter any, action in time has one side of action earlier of solenoid valve successively to produce the disappearance of open circuit surge voltage Vs.When common switch element that cuts off driving elder generation action one side electromagnetic coil or independent switch element, its game method is identical with the interior mutually abnormal case of Fig. 5, and method of disposal can be unified like this, is easily.
But about the phase fault between this group, if shorten the fuel injection time cycle, the discharge time that do not overlap does not just need to cut off common switch element and independent switch element.Even cut off common switch element and independent switch element, the common switch element and the independent switch element of back action one side are also unaffected.
Be used for illustrating the overall work situation of the fault-detecting circuit of above-mentioned fuel injection system about this example 1 below with the sequence of movement of microprocessor shown in Figure 10 9.
Among Figure 10,100 begin step for work, 101 for judging the step of the reset instruction that external tool 40 inputs of having no way of are arranged after beginning step 100,102 will be stored in the step that the fault message of the interior RAM storage of microprocessor 9 resets during for YES for determination step 101,103 steps be the release of determination step 102 or above-mentioned steps 101 during for NO (is not connected with external tool 40, though or connect do not export reset instruction) step of the sense order that the external tool 40 of having no way of exports arranged.
104 will be stored in the step that fault message in the interior RAM storage of microprocessor 9 is sent into external tool 40 during for YES for determination step 103,105 steps be the release of determination step 104 or above-mentioned steps 103 during for NO (is not connected with external tool, though or connection do not export sense order) drive signal SW1～SW4 step in generation whether.(not carrying out fuel sprays) came back to beginning step 100 to end step 106 transition when above-mentioned steps 105 was NO.
107 steps are upgraded the up-to-date situation occurred of the drive signal SW1～SW4 of repetitive operation during for YES and are obtained in above-mentioned steps 105,108 steps after step 107 with testing signal IN13, the up-to-date input status of IN42 upgrades and obtains, 110 steps are judged lower edge change point (the time change point of logic level " H " → " L ") the back testing signal IN13 of drive signal SW1～SW4 after 108 steps, whether IN42 lacks, whether 111 steps have to overlap in the drive signal impulse that determination step 110 is obtained renewal in 105 steps during for YES lists driving time and have cycle current"on"time of electromagnetic coil is successively judged, 112 steps are stored this state thereafter and are shortened current"on"time when determination step 111 is YES, abnormal alarm display unit 42 is produced report to the police simultaneously, show output.Till this stored information stores into always and is resetted by 102 steps.
When 113 steps were NO in above-mentioned 111 steps, corresponding with which drive signal to the disappearance of the open circuit surge voltage Vs of above-mentioned 110 steps, the information of the open circuit surge voltage Vs disappearance of the electromagnetic coil of which phase was determined and is stored.114 steps will drive the electromagnetic coil of open circuit surge voltage disappearance phase after this step common switch element cuts off, and 115 steps produce alarm indication output to abnormal alarm display unit 42.Finish or above-mentioned 110 steps carry out the transition to 120 steps when being the release of NO or above-mentioned 112 steps in this 115 step.
In 113 steps, detect the internal fault mutually of short circuit, broken string and the open circuit etc. of electromagnetic coil, distribution, driving element.In 114 steps, to cutting off also (for safety) group of cutting off independent switch element 13,14 (or 23,24) cut-out of switching on of common switch element 11 (or 21).
In 112 steps, make electromagnetic coil successively not have the energising overlapping time, prevent that as being used to the unusual discharge time about phase fault 71 between the group of Fig. 7 from suppressing means.
Whether 120 steps are to repeating to take place superfluous testing signal IN13, IN42 behind the lower edge change point (the time change point of logic level " H " → " L ") of drive signal SW1～SW4, when 121 steps are YES at this determination step 120, to the repetition of the open circuit surge voltage Vs corresponding with which drive signal, the phase fault of the electromagnetic coil of which phase is determined and is stored.122 steps common switch element to the electromagnetic coil that drives phase fault after 121 steps cuts off, and 123 steps produce alarm indications output to abnormal alarm display unit 42.Finish or above-mentioned 120 steps when being NO in this 123 step, enter end step 106, come back to beginning step 100.
121 steps are as for phase fault 70 in the group of Fig. 7 being unusual seizure the as the 1st, the 4th electromagnetic coil 5,8, by 122 steps to cutting off also (for safety) group of cutting off independent switch element 13,14 cut-out of switching on of common switch element 11.
Carrying out the electromagnetic coil numbering of the phase behind the abnormality juding or the numbering cylinder of motor etc. in above-mentioned 113 and 121 steps is stored in the nonvolatile memories such as the RAM storage that can keep when having a power failure with battery or EEPROM.Read by external tool 40 by 104 steps during maintenance overhaul and show, and reset to A-stage by 102 steps.
Example 2
Figure 11 is the detailed circuit diagram about the fault-detecting circuit of the fuel injection system of the invention process form 2.Below the difference of main explanation and example 1.
Among Figure 11, in the 1st Drive and Control Circuit 10, high side switch element 11a is by the quick overexcitation control signal SW13 control of switching on, the light current retentive control signal DT13 that low voltage terminal switching element 11b is exported with the light current road retentive control circuit 19 identical with above-mentioned example 1 moves, with the control of switching on.The circuit that booster circuit 11c boosts for the voltage with voltage source 3.Diode 16a carries out feed by high side switch element 11a to the 1st, the 4th electromagnetic coil 5,8 from above-mentioned booster circuit 11c.On the other hand, diode 16b carries out feed by low voltage terminal switching element 11b to the 1st, the 4th electromagnetic coil 5,8 from voltage source 3.Among Figure 11, be the state that common switch element 11 is divided into high side switch element 11a and low voltage terminal switching element 11b shown in Figure 1, but all be public switching elements that this point does not change to the 1st, the 4th electromagnetic coil 5,8 feeds.About the 2nd Drive and Control Circuit 20, its structure is the same with above-mentioned the 1st Drive and Control Circuit 10, no longer has been illustrated here.
Describe the action of said structure below in detail.
In the fault-detecting circuit of the fuel injection system of structure shown in Figure 11, voltage source 3 as be the on-vehicle battery of DC12V, booster circuit 11c, 21c are as the high-voltage power from DC12V generation DC120V, fast driving electromagnetic coil.
Low voltage terminal switching element 11b, 21b keep using with light current Ih for supplying with the electromagnetic coil action, heat up by suppress booster circuit 11c, 21c from voltage source 3 direct feeds.
In the fault-detecting circuit of this example 2, with the fault-detecting circuit comparison in the above-mentioned example 1, the field current of electromagnetic coil 5～8 reduces, so can reduce the intensification of common switch element and independent switch element.
Example 3
Figure 12 is the detailed circuit diagram of fault-detecting circuit of the fuel injection system of the invention process form 3.Below the difference of main explanation and Fig. 1 occasion.
Among Figure 12, the circuit that booster circuit 11d boosts for the supply voltage with voltage source 3.High side switch element 11a is by the quick overexcitation control signal SW13 control of switching on, and low voltage terminal switching element 11b is with the light current retentive control signal DT13 control of switching on.Diode 16a carries out feed by high side switch element 11a to the 1st, the 4th electromagnetic coil 5,8 from above-mentioned booster circuit 11d.On the other hand, diode 16b carries out feed by low voltage terminal switching element 11b to the 1st, the 4th electromagnetic coil 5,8 from voltage source.
Equally, high side switch element 21a is by the high-speed excitation control signal SW42 control of switching on, and low voltage terminal switching element 21b is with the light current retentive control signal DT42 control of switching on.Diode 26a carries out feed by high side switch element 21a to the 2nd, the 3rd electromagnetic coil 6,7 from above-mentioned booster circuit 21d.On the other hand, diode 26b carries out feed by low voltage terminal switching element 21b to the 2nd, the 3rd electromagnetic coil 6,7 from voltage source 3.
In the above range, compare with above-mentioned example 2, different only is that booster circuit 11c, 21c are combined into public booster voltage 11d.
Pull down resistor 12a is in parallel with change of current diode 12, and divider resistance 12b, 12c carry out dividing potential drop with the voltage of voltage source 3.Compensating resistance 12d is connected between above-mentioned pull down resistor 12a and the divider resistance 12c, and the voltage of above-mentioned divider resistance 12c is applied to the non-counter-rotating input end of comparison circuit 43,44.
Resistance R12b, the R12c of the resistance R12a of pull down resistor 12a and divider resistance 12b, 12c and compensating resistance 12d, R12d compare, and setting value is much smaller.
Same pull down resistor 22a is in parallel with change of current diode 22, and divider resistance 22b, 22c carry out dividing potential drop with the voltage of voltage source 3.Compensating resistance 22d is connected between above-mentioned pull down resistor 22a and the divider resistance 22c, and the voltage of above-mentioned divider resistance 22c is applied to the non-counter-rotating input end of comparison circuit 45,46.
Resistance R22b, the R22c of the resistance R22a of pull down resistor 22a and divider resistance 22b, 22c and compensating resistance 22d, R22d compare, and setting value is much smaller.
13b is the diode of open circuit surge voltage detection usefulness, and 13c, 13d are divider resistance.Above-mentioned diode 13b and divider resistance 13c, 13d are connected in series mutually, are connected between the negative terminal of the negative terminal of the 1st electromagnetic coil 5 and voltage source 3.The voltage of divider resistance 13d is applied to the counter-rotating input end of comparison circuit 43.
Equally, 14b, 23b, 24b are the diode that the open circuit surge voltage detects usefulness, and 14c, 14d, 23c, 23d, 24c, 24d are divider resistance.Equally, the voltage of each divider resistance 14d, 23d, 24d is applied to the counter-rotating input end of comparison circuit 44～46 respectively.
Even one of them output of above-mentioned comparison circuit 43 or 46 is logic level " L ", logic and circuit 37 are also supplied with microprocessor 9 with the testing signal IN13 of logic level " L ".Equally, even one of them output of above-mentioned comparison circuit 44 or 45 is logic level " L ", logic and circuit 38 are also supplied with microprocessor 9 with the testing signal IN42 of logic level " L ".
Open circuit surge voltage testing circuit 39 is made of above-mentioned comparison circuit 43,44 and comparison circuit 45,46.
About the action of said structure, the action with comparison circuit 43 is main being illustrated below.
At first, high side switch element 11a and 13 conductings of independent switch element, 5 quick actings of the 1st electromagnetic coil.Then high side switch element 11a is cut off, and is undertaken to keeping the light current control of action by low voltage terminal switching element 11b.
Soon, drive signal SW1 becomes logic level " L ", and low voltage terminal switching element 11b and independent switch element 13 are when being cut off, negative terminal at the 1st electromagnetic coil 5 produces open circuit surge voltage Vs shown in Figure 2, and the branch pressure voltage after divider resistance 13c, 13d dividing potential drop is supplied with the counter-rotating input end of comparison circuit 43.
On the other hand, the voltage of the non-counter-rotating input end of the comparison circuit 43 on this time point is because the voltage at pull down resistor 12a two ends is zero substantially, so become resistance value R12b and (R12c//R12d) supply voltage is carried out low value after the dividing potential drop.(R12c//R12d) be the combined resistance in parallel of resistance R 12c and R12d.
Therefore, the input voltage of circuit 43 as a comparison, non-counter-rotating input end is lower than the counter-rotating input end, and the output of comparison circuit 43 produces the normal testing signal of logic level " L ".
But, because of short circuit current 140 relations, 1st, the contact of the 4th electromagnetic coil 5,8 is on power circuit during short circuit, and the branch pressure voltage that is applied to the non-counter-rotating input end of comparison circuit 43,44 will become resistance value (R12b//R12d) and R12c supply voltage is carried out high value after the dividing potential drop.(R12b//R12d) be the combined resistance in parallel of resistance R 12b and R12d.
Therefore, the input voltage of circuit 43 as a comparison, non-counter-rotating input end is a high voltage, comparison circuit 43 is output as logic level " H ", the detection of the surge voltage of not opening a way.
Like this, as adopt the fault-detecting circuit of fuel injection system shown in Figure 12, the short circuit that can detect common switch element one side is unusual, for other electromagnetic coil too.
Unusual for this short circuit, in 113 steps of Figure 10, determine to lack mutually with storage, keep the disconnection of common switch element 11 and independent switch element 13,14 by 114 steps.
In addition, causing the common junction of common junction and the 2nd, the 3rd electromagnetic coil 6,7 of the 1st, the 4th electromagnetic coil 5,8 by short circuit 141 between group is that short circuit is when connecting, when having current"on"time of electromagnetic coil successively not overlap, do not take place any unusually, the existence of short circuit 141 does not detect yet.
On the other hand, when having current"on"time of electromagnetic coil successively that overlapping is arranged, during independent switch element open circuit, because the voltage of comparison circuit 13b, the 14b of Figure 12, the non-counter-rotating input end of 23b, 24b rises, so become the state that can not detect open circuit surge voltage Vs, the processing of shortening current"on"time by 112 steps of Figure 10 is handled by this and to be realized emergency operation.
Example 4
In this above-mentioned example 1 to 3,, adopted to suppress the corresponding emergency method of discharge time for the phase fault between group.But also can not suppress the processing of discharge time, and wait the energising that realizes group to cut off by cutting off the common switch element.
Use 4 cylinders to be illustrated above, even but be the motor of 6 cylinders, 8 cylinders, 2 groups common switch element also can be used, or 3 groups (6 cylinder), 4 groups (8 cylinders) are pressed the common switch element of group differentiation.
Further, when motor is the gasoline motivation, when fuel injection control system comprises the IGNITION CONTROL function of motor, except that fuel injection control is proofreaied and correct, also recoverable firing time, the shortening when taking place unusually drives running, can carry out more stable emergency operation like this.
In addition, the abnormal alarm display unit can show as shorten to drive running state, Quan Zuwei stop state that fuel spraying unusually and fully or spray stopping to handle etc. according to broken string, the short circuit of ignition mechanism group, the fuel that catches fire etc.That is, the abnormal alarm display unit can be carried out warning and demonstration comprehensive, graded properties.
As mentioned above, employing is about the fault-detecting circuit of fuel injection system of the present invention, not only can detect short circuit, broken string, the open circuit of fuel injection control with summing up property, and can also detect phase fault with the repetition decision maker by the disappearance decision maker of open circuit surge voltage by simple open circuit surge voltage testing circuit with electromagnetic coil and switching element, distribution etc.And,, can realize stable emergency operation by grouping to the common switch element.
Because the Current Control for electromagnetic coil is carried out in common switch element one side, so, can easily detect the open circuit surge voltage by the voltage at independent switch element two ends is monitored.
Because two terminal potentials by electromagnetic coil detect the open circuit surge voltage, so the mutual short circuit that reaches unusually between the group for the short circuit of common switch element also detects easily.
Because suitably open circuit surge voltage testing circuit is carried out logic and processing by logic and circuit, thus the repetition of decidable open circuit surge voltage, but also the input that can reduce microprocessor is counted and hardware.
Because available common switch element carries out the control of quick overexcitation separately and action keeps the light current control of usefulness,, lowly also can obtain effect even electromagnetic coil is withstand voltage so there is the feed control circuit to simplify.
Because can be with the common switch element divisions, the action of carrying out high-tension quick overexcitation control and low voltage keeps with light current control, reduces so flow to the magnitude of current of common switch element, and heating reduces, and device volume diminishes.
Because can use independent overexcitation booster circuit, realize quick overexcitation, so the effect that device is little, cost is low is arranged to all electromagnetic coils.
Because when cutting off the common switch element, can suitably divide into groups with unusual generation, so, can realize stable emergency operation by the electromagnetic coil relevant with remaining common switch element.
For the short circuit between on the same group is not unusual,, can realize more stable emergency operation by shortening the current"on"time of above-mentioned drive signal impulse row.
Because report to the police and show according to disappearance/repetitions of open circuit surge circuit is unusual,, improved Security so can report to the police to all faults of general imagination.Because microprocessor has the interface circuit that is connected usefulness with external tool, so identifying information that unusual electromagnetic coil takes place can be read and shown to external tool, can improve the working efficiency of maintenance thus, can stored information be got back to original state easily from external tool simultaneously.
Claims (11)
1. the fault-detecting circuit of a fuel injection system is characterized in that, comprising:
Driving is sprayed a plurality of electromagnetic coils of using solenoid valve for the fuel of each cylinder of multicylinder engine;
Produce the microprocessor of drive signal impulse row and quick overexcitation control signal;
Drive signal impulse row according to producing from described microprocessor drive a plurality of independent switch elements that described a plurality of electromagnetic coil carries out switch motion successively;
According to the quick overexcitation control signal that produces from described microprocessor, at least by the fuel injection sequence many groups common switch element that electromagnetic coil in one group that two a plurality of electromagnetic coils more than the stroke form carries out the integral feed driving of being separated by;
At least a plurality of open circuit surge voltage testing circuits of detecting of the open circuit surge voltage that produces to independent switch element open circuit that on the same group electromagnetic coil is not corresponding the time,
Described microprocessor compares the testing signal that produces from described a plurality of open circuit surge voltage testing circuits, has or not disappearance and repeats to judge unusual according to this testing signal.
2. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that,
Whether the described surge voltage testing circuit of respectively opening a way has surpassed the magnitude of voltage of voltage source by means of the both end voltage value that detects described independent switch element when the described independent switch element open circuit, detects described open circuit surge voltage.
3. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that,
The described surge voltage testing circuit of respectively opening a way, whether the terminal voltage of the negative terminal of described electromagnetic coil is higher than the voltage of the feed end that is connected with described public switch element during by means of described independent switch element of detection and described common switch element open circuit, detects described open circuit surge voltage.
4. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that, comprising:
Logic and circuit, to carrying out logic and processing by testing signal for the open circuit surge voltage testing circuit output of the electromagnetic coil of the different group of described common switch element,
Described microprocessor is judged according to the output of described logic and circuit unusually.
5. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that,
Described each common switch element is corresponding to moving from the quick overexcitation control signal of described microprocessor and the light current retentive control signal that is used to keep described electromagnetic coil to move.
6. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that, comprising:
The overexcitation booster circuit that supply voltage is boosted,
Described common switch element is made up of high side switch element and low voltage terminal switching element, the high side switch element carries out feed with booster circuit to described electromagnetic coil by described overexcitation and drives, the low voltage terminal switching element keeps the light current retentive control signal of described electromagnetic coil action to move corresponding to being used to, and drives described electromagnetic coil is carried out feed.
7. the fault-detecting circuit of fuel injection system as claimed in claim 6 is characterized in that,
Described high side switch element share described overexcitation booster circuit, and described overexcitation is public with booster circuit to all electromagnetic coils.
8. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that, comprising:
Described microprocessor is being judged to be according to the testing signal that is produced by described open circuit surge testing circuit when unusual, and one group of shut-off means of switching on that the common switch element of correspondence and the independent switch element that be connected in series with this common switch element are cut off is provided,
Utilization is carried out emergency operation with the group electromagnetic coil in addition that described independent switch element cuts off.
9. the fault-detecting circuit of fuel injection system as claimed in claim 8 is characterized in that,
Described microprocessor is judged to be when unusual in the disappearance according to described open circuit surge voltage, if there have have the current"on"time of electromagnetic coil successively to be overlapping, then to shortening current"on"time of described drive signal impulse row processing.
10. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that, comprising:
Anomaly alarming device receives abnormal signal and reports to the police to unusual,
Described microprocessor is being judged to be according to the testing signal that is produced by described open circuit surge voltage testing circuit when unusual, to described anomaly alarming device output abnormality signal.
11. the fault-detecting circuit of fuel injection system as claimed in claim 1 is characterized in that,
Described microprocessor has the interface circuit that is connected usefulness with external tool.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001213738A JP3699370B2 (en) | 2001-07-13 | 2001-07-13 | Failure detection circuit for fuel injection device |
| JP2001213738 | 2001-07-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1397723A CN1397723A (en) | 2003-02-19 |
| CN1292160C true CN1292160C (en) | 2006-12-27 |
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ID=19048670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02126425 Expired - Fee Related CN1292160C (en) | 2001-07-13 | 2002-07-11 | Fault detecting circuit of fuel injection device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3699370B2 (en) |
| CN (1) | CN1292160C (en) |
| DE (1) | DE10200847B4 (en) |
| GB (1) | GB2377507B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106460703A (en) * | 2014-05-13 | 2017-02-22 | 日立汽车系统株式会社 | Fuel injection system for internal combustion engine |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4470774B2 (en) * | 2005-03-18 | 2010-06-02 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| FI119030B (en) * | 2005-04-28 | 2008-06-30 | Waertsilae Finland Oy | Control arrangement for fuel input device for an internal combustion engine |
| 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 |
| KR101498809B1 (en) * | 2012-09-05 | 2015-03-04 | 나부테스코 가부시키가이샤 | Driving circuit for electromagnetic valve |
| GB201217149D0 (en) * | 2012-09-26 | 2012-11-07 | Delphi Tech Holding Sarl | Diagnostic circuit and method for diagnosing a fault |
| JP5821907B2 (en) | 2013-06-28 | 2015-11-24 | 株式会社デンソー | Fuel injection valve control device |
| JP6124728B2 (en) * | 2013-08-07 | 2017-05-10 | 本田技研工業株式会社 | Fuel pump control device |
| KR101567165B1 (en) * | 2013-12-19 | 2015-11-09 | 현대자동차주식회사 | Injector driver |
| JP6183341B2 (en) * | 2014-12-03 | 2017-08-23 | 株式会社デンソー | Injector drive device |
| WO2017006996A1 (en) * | 2015-07-08 | 2017-01-12 | アイシン・エィ・ダブリュ株式会社 | Drive device |
| CN105042159A (en) * | 2015-07-24 | 2015-11-11 | 苏州市大力电器有限公司 | Electromagnetic valve drive device with fault diagnosis function and self-protection function |
| US10161340B1 (en) * | 2017-10-02 | 2018-12-25 | GM Global Technology Operations LLC | Fuel injection system and method for a vehicle propulsion system |
| JP7172912B2 (en) * | 2019-08-08 | 2022-11-16 | 株式会社デンソー | Drive circuit and drive device for switch |
| CN110445395A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Wide-voltage range direct current input switch power supply |
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| JPH0792016B2 (en) * | 1986-06-09 | 1995-10-09 | 三菱電機株式会社 | Failure detection circuit for fuel injection valve drive circuit for internal combustion engine |
| IT1261580B (en) * | 1993-09-07 | 1996-05-23 | Fiat Ricerche | INJECTOR FAULT DIAGNOSIS METHOD OF HIGH PRESSURE INJECTION SYSTEMS FOR INTERNAL COMBUSTION ENGINES |
| JP3541524B2 (en) * | 1995-10-12 | 2004-07-14 | 株式会社デンソー | Solenoid valve drive |
| JP3694950B2 (en) * | 1996-01-09 | 2005-09-14 | 日産自動車株式会社 | Fuel injection valve drive circuit for multi-cylinder direct injection engines |
| JP3878261B2 (en) * | 1996-11-26 | 2007-02-07 | 富士通テン株式会社 | Failure determination device, flow rate control device, and fuel injection device for internal combustion engine |
| JPH10257799A (en) * | 1997-03-07 | 1998-09-25 | Toyota Motor Corp | Output open-circuiting detection device of multichannel output device |
| JP3828239B2 (en) * | 1997-05-22 | 2006-10-04 | 三菱電機株式会社 | Control device for injector for fuel injection |
| JP3916867B2 (en) * | 2000-12-14 | 2007-05-23 | 三菱電機株式会社 | In-vehicle electric load drive system abnormality detection device |
-
2001
- 2001-07-13 JP JP2001213738A patent/JP3699370B2/en not_active Expired - Fee Related
-
2002
- 2002-01-11 DE DE10200847A patent/DE10200847B4/en not_active Expired - Fee Related
- 2002-01-15 GB GB0200830A patent/GB2377507B/en not_active Expired - Fee Related
- 2002-07-11 CN CN 02126425 patent/CN1292160C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106460703A (en) * | 2014-05-13 | 2017-02-22 | 日立汽车系统株式会社 | Fuel injection system for internal combustion engine |
| CN106460703B (en) * | 2014-05-13 | 2019-06-07 | 日立汽车系统株式会社 | The fuel injection device of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10200847A1 (en) | 2003-01-30 |
| GB2377507B (en) | 2003-07-23 |
| DE10200847B4 (en) | 2010-09-23 |
| CN1397723A (en) | 2003-02-19 |
| GB2377507A (en) | 2003-01-15 |
| GB0200830D0 (en) | 2002-03-06 |
| JP2003027993A (en) | 2003-01-29 |
| JP3699370B2 (en) | 2005-09-28 |
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