CN204790553U - A fault diagnosis circuit for an inner drive electronic control igniting system - Google Patents
A fault diagnosis circuit for an inner drive electronic control igniting system Download PDFInfo
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- CN204790553U CN204790553U CN201520460687.7U CN201520460687U CN204790553U CN 204790553 U CN204790553 U CN 204790553U CN 201520460687 U CN201520460687 U CN 201520460687U CN 204790553 U CN204790553 U CN 204790553U
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Abstract
The utility model discloses a fault diagnosis circuit for an inner drive electronic control igniting system, include: the sampling module is sampled to the electric current of the power switch pipe of flowing through, obtains the sample current value, calculation module receives sample current, according to sample current obtains an energy integral, relatively the module is received sample current and energy integral will the comparison is carried out to a sample current and an electric current threshold value, and will the energy integral carries out the comparison with the energy threshold value, and the judge module, connect compare the module, according to relatively the comparative result of module is judged whether the jar at ignition coil place breaks down. A fault diagnosis circuit for an inner drive electronic control igniting system can diagnose multiple trouble effectively under full operating mode, circuit structure is simple, and the method realizes conveniently.
Description
Technical field
The utility model relates to the electronic control ignition technical field of engine, particularly relate to a kind of in drive the fault diagnosis circuit of electronic control ignition system.
Background technology
Flourish along with auto industry, the increase of vehicle integrated cost receives increasing concern with the relevant environmental protection of discharge.The new power system of auto industry Study on Acceleration is to reduce fuel consume, improve power density and strengthen vehicle robustness.As the pith of automobile dynamic system, remarkable contribution has been made in the increase of firing system to the raising of system effectiveness, the reduction of exhaust emission and robustness.
The main igniting form that coil igniting is current gasoline engine, rock gas sends out engine, hydrogen engine and other engine fuels.The IGNITION CONTROL of coil ignition system is by electronic control unit (ElectronicControlUnit, be called for short ECU) in microprocessor control, the accurate control of the engine location information realization ignition timing relying on crankshaft sensor and camshaft-signal sensor to provide.Coil ignition system is primarily of ignition coil, igniting driving power level (i.e. power switch pipe), ECU and spark plug composition.
Drive in being divided into according to the position of igniting driving power level and drive two kinds outward.Inside driving is exactly that the driving power level of ignition coil is inner at ECU, and driving outward is exactly that the driving power of ignition coil is inner at ignition coil.Drive for interior; the ECU major part of engine management system drives diagnostic function and the defencive function of igniting in not possessing in the market; if there is the fault such as overcurrent, short circuit for a long time or repeatedly; the ignition driver part of ECU inside can be caused to burn; thus cause whole ECU to scrap; in vehicle operating, even bring security risk.Relative to only miscellaneous part is as the damage of ignition coil, inside drive igniting without the infringement diagnosing defencive function to cause more greatly, maintenance cost is higher.
Utility model content
The purpose of this utility model is, provide a kind of in drive the fault diagnosis circuit of electronic control ignition system, under full working scope, effectively can diagnose various faults, circuit structure is simple, and method realizes convenient.
For solving the problems of the technologies described above, the utility model provide a kind of in drive the fault diagnosis circuit of electronic control ignition system,
Drive electronic control ignition system in described and comprise microprocessor, predrive element and power switch pipe, one output terminal of described microprocessor connects grid or the base stage of described power switch pipe by described predrive element, the collector of described power switch pipe connects an ignition coil, the grounded emitter of described power switch pipe, described fault diagnosis circuit comprises:
Sampling module, samples to the electric current flowing through described power switch pipe, obtains sampled current value;
Computing module, connects described computing module, and described computing module receives described sample rate current, obtains an energy integral according to described sample rate current;
Comparison module, connects described sampling module and computing module, and described comparison module receives described sample rate current and energy integral, described sample rate current and a current threshold is compared, and described energy integral and energy threshold is compared; And
Judge module, connects described comparison module, according to the comparative result of described comparison module, judges whether the cylinder at described ignition coil place breaks down.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described,
Between the charge period of described power switch pipe:
Described comparison module receives described sample rate current, described sample rate current and current threshold is compared, and whether described judge module is more than or equal to described current threshold according to described sample rate current, judges whether the cylinder at described ignition coil place occurs short trouble; Simultaneously, described computing module receives described sample rate current, described computing module obtains an overcurrent integration according to described sample rate current, described comparison module receives described overcurrent integration, described overcurrent integration and an overcurrent threshold value are compared, whether described judge module is more than or equal to described overcurrent threshold value according to described overcurrent integration, judges whether the cylinder at described ignition coil place occurs over current fault;
Interdischarge interval at described power switch pipe:
Described computing module receives described sample rate current, described computing module obtains one according to described sample rate current and crosses energy integral, described comparison module reception is described crosses energy integral, described energy integral excessively and one are crossed energy threshold compare, whether described judge module is more than or equal to described energy threshold excessively according to described energy integral excessively, judges whether the cylinder at described ignition coil place occurred energy failure.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, between the charge period of described power switch pipe, described judge module also according to described ignition coil whether no current, judges whether the cylinder at described ignition coil place occurs open fault.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, described fault diagnosis circuit also comprises a selection module, described selection module is selected to select the parts that overcurrent is the weakest according to an overcurrent image parameter table, described overcurrent image parameter table is included in the weakest parts of overcurrent under different operating mode, computing module described in described selection model calling, described computing module according to the selection result of described selection module, the overcurrent integration of parts the weakest described in calculating.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, the weakest described parts are power switch pipe, and the formula that described computing module calculates overcurrent integration is:
W1＝k1∫Ic(t)dt
Wherein, W1 is the overcurrent integration of described power switch pipe, and k1 is constant, and Ic is described sample rate current, and t is the time.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, the weakest described parts are resistance, and the formula that described computing module calculates overcurrent integration is:
W1′＝R∫Ic
2(t)dt
Wherein, the overcurrent integration that W1 ' is described resistance, R is the resistance of described resistance, and Ic is described sample rate current, and t is the time.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, the formula of the calculated energy integral of described computing module is:
W2＝k2∫Ic(t)dt
Wherein, W2 is the energy integral of described power switch pipe, and k2 is constant, and Ic is described sample rate current, and t is the time.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, described sampling module comprises a sampling resistor, and one end of described sampling resistor is connected to source electrode or the emitter of described power switch pipe, the other end ground connection of described sampling resistor.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, described sampling module also comprises an analog to digital converter, described analog to digital converter connects described sampling resistor, computing module and comparison module, described analog to digital converter is the analog to digital converter of described microprocessor, described computing module is the computing module of described microprocessor, and described comparison module is the comparison module of described microprocessor, and described judge module is the judge module of described microprocessor.
Further, drive in the fault diagnosis circuit of electronic control ignition system in described, drive electronic control ignition system in described and comprise multiple described power switch pipe, all described power switch pipes share same described sampling module; Or multiple described power switch pipe connects a described sampling module separately separately; Or the described power switch pipe at interval shares same described sampling module successively.
Compared with prior art, the fault diagnosis circuit that the utility model drives electronic control ignition system in providing has the following advantages:
Drive in the fault diagnosis circuit of electronic control ignition system in the utility model provides, the electric current flowing through described power switch pipe is sampled, obtain sampled current value, an energy integral is obtained according to described sample rate current, described sample rate current and current threshold are compared, and described energy integral and energy threshold are compared, thus can according to described sample rate current or the described energy integral calculated by described sample rate current, effectively various faults is diagnosed under full working scope, and effectively protect described in drive electronic control ignition system, fault diagnosis circuit structure is simple, method for diagnosing faults realizes convenient.
Accompanying drawing explanation
Fig. 1 be in the utility model one embodiment in drive the schematic diagram of the fault diagnosis circuit of electronic control ignition system;
Fig. 2 be in the utility model one embodiment in drive the schematic diagram of the fault diagnosis circuit of electronic control ignition system;
Fig. 3 be in the utility model one embodiment in drive the process flow diagram of fault diagnosis circuit when carrying out fault diagnosis of electronic control ignition system;
Fig. 4 be in the utility model one embodiment in drive short trouble appears in electronic control ignition system current diagram when the charging of power switch pipe starts;
Fig. 5 be in the utility model one embodiment in drive the current diagram that short trouble appears in electronic control ignition system between the charge period of power switch pipe;
Fig. 6 be in the utility model one embodiment in drive the current diagram that over current fault appears in electronic control ignition system between the charge period of power switch pipe;
Fig. 7 be in the utility model one embodiment in drive energy failure appearred in electronic control ignition system current diagram at the interdischarge interval of power switch pipe.
Embodiment
Below in conjunction with schematic diagram, the fault diagnosis circuit driving electronic control ignition system in of the present utility model is described in more detail, which show preferred embodiment of the present utility model, should be appreciated that those skilled in the art can revise the utility model described here, and still realize advantageous effects of the present utility model.Therefore, following description is appreciated that extensively knowing for those skilled in the art, and not as to restriction of the present utility model.
In order to clear, whole features of practical embodiments are not described.They in the following description, are not described in detail known function and structure, because can make the utility model chaotic due to unnecessary details.Will be understood that in the exploitation of any practical embodiments, a large amount of implementation detail must be made to realize the specific objective of developer, such as, according to regarding system or the restriction about business, change into another embodiment by an embodiment.In addition, will be understood that this development may be complicated and time-consuming, but be only routine work to those skilled in the art.
In the following passage, more specifically the utility model is described by way of example with reference to accompanying drawing.According to the following describes and claims, advantage of the present utility model and feature will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, aid illustration the utility model embodiment lucidly.
Core concept of the present utility model is, there is provided a kind of in drive the fault diagnosis circuit of electronic control ignition system, drive electronic control ignition system in described and comprise microprocessor, predrive element and power switch pipe, one output terminal of described microprocessor connects grid or the base stage of described power switch pipe by described predrive element, the collector of described power switch pipe connects an ignition coil, the grounded emitter of described power switch pipe, described fault diagnosis circuit comprises: sampling module, for sampling to the electric current flowing through described power switch pipe, obtain sampled current value, computing module, receives described sample rate current, obtains an energy integral according to described sample rate current, comparison module, receives described sample rate current and energy integral, described sample rate current and a current threshold is compared, and described energy integral and energy threshold is compared, and judge module, connect described comparison module, according to the comparative result of described comparison module, judge whether the cylinder at described ignition coil place breaks down.Described fault diagnosis circuit effectively can diagnose various faults under full working scope, and effectively protect described in drive electronic control ignition system, fault diagnosis circuit structure is simple, and method for diagnosing faults realizes convenient.
In conjunction with core concept of the present utility model, as shown in Figure 3, the flow process when carrying out fault diagnosis of driving the fault diagnosis circuit of electronic control ignition system in of the present utility model comprises:
Step S11, the electric current flowing through described power switch pipe to be sampled, obtain sampled current value;
Step S12, obtain an energy integral according to described sample rate current;
Step S13, described sample rate current and current threshold to be compared, and described energy integral and energy threshold are compared; And
Step S14, result according to the comparison of described sample rate current and energy integral, judge whether the cylinder at described ignition coil place breaks down.
Below please refer to Fig. 1-Fig. 7 to illustrate the fault diagnosis circuit driving electronic control ignition system in the present embodiment.Drive electronic control ignition system in described and comprise Micro-processor MCV, predrive element and power switch pipe, described Micro-processor MCV, predrive element and power switch pipe are all positioned at electronic control unit ECU.In the present embodiment, be described for the engine of 4 cylinders to drive electronic control ignition system in described, so draw 4 ignition coils, 4 predrive elements and 4 power switch pipes in FIG, in other embodiment of the present utility model, the engine that electronic control ignition system can also be used for 1 cylinder, 2 cylinders, 3 cylinders, 5 cylinders, 6 cylinders or 8 cylinders etc. is driven in described, this is what those having ordinary skill in the art will appreciate that, and therefore not to repeat here.Wherein, described power switch pipe mainly contains BIP and manages (BIP:BipolarTransistors, bipolar transistor), standard ignition IGBT manages (InsulatedGateBipolarTransistor, insulated gate bipolar transistor), the band igniting driving power level special ignition module of intelligent function and the firing power level etc. with outside ASIC.In the present embodiment, for described power switch pipe for IGBT pipe is described, for igniting IGBT pipe, as long as application conditions is no more than specification, just can normally work for a long time.For the electronic control unit ECU determined, ability to work and the specification of IGBT pipe just determine, and this does not rely on its external loading (ignition coil).When short-circuited outside fault, the electric current flowing through IGBT pipe sharply increases; And when there is overcurrent or energy surplus (namely crossing energy), the temperature of IGBT pipe rises fast, can easily exceed its specification and cause damaging; When opening a way in outside, no current flows through IGBT pipe.The diagnosis and protection function of driving in igniting can be designed by detecting the electric current flowing through IGBT by drawing.
As shown in Figure 1,4 output terminals O1, O2, O3, O4 of described Micro-processor MCV connect 4 predrive elements D1, D2, D3, D4 respectively successively, 4 predrive elements D1, D2, D3, D4 connect the grid g of 4 IGBT pipes P1, P2, P3, P4 more respectively successively, the collector c of 4 IGBT pipes P1, P2, P3, P4 connects 4 ignition coils C1, C2, C3, C4, the equal ground connection of emitter e of 4 IGBT pipes P1, P2, P3, P4 respectively successively.
As shown in Figure 1, described fault diagnosis circuit 1 comprises sampling module 110, computing module 120, comparison module 130 and judge module 140.Wherein, described sampling module 110, for sampling to the electric current (namely flowing through the electric current of the armature winding of ignition coil) flowing through IGBT pipe P1, P2, P3, P4, obtains the value of sample rate current Ic.In the present embodiment, all described power switch pipe P1, P2, P3, P4 share same described sampling module 110, thus can simplify circuit, save circuit cost.In other embodiment of the present utility model, multiple described power switch pipe P1, P2, P3, P4 can also connect a described sampling module 110 separately separately, to diagnose when multi-cylinder igniting is overlapping; Or, the described power switch pipe at interval shares same described sampling module 110 successively, namely described power switch pipe P1, P3 share same described sampling module 110, described power switch pipe P2, P4 share same described sampling module 110, both be conducive to saving circuit cost, can diagnose when multi-cylinder igniting is overlapping again, thus be conducive to reaching preferably diagnosis efficiency.According to foregoing description of the present utility model, the mode that the described power switch pipe that multiple described power switch pipe P1, P2, P3, P4 connect separately a described sampling module 110 or interval successively separately shares same described sampling module 110 is what those having ordinary skill in the art will appreciate that, and therefore not to repeat here.
Preferably, described sampling module 110 comprises a sampling resistor 111, one end of described sampling resistor 111 is connected to the emitter e of described IGBT pipe P1, P2, P3, P4, the other end ground connection of described sampling resistor 111, detects the electric current flowing through IGBT pipe P1, P2, P3, P4.Described sampling module 110 also comprises an analog to digital converter 112, described analog to digital converter 112 connects described sampling resistor 111, computing module 120 and comparison module 130, in the present embodiment, described analog to digital converter 112 is the analog to digital converter of described Micro-processor MCV, described computing module 120 is the computing module of described Micro-processor MCV, described comparison module 130 is the comparison module of described Micro-processor MCV, described judge module 140 is the judge module of described Micro-processor MCV, to increase the integrated level of circuit.Described analog to digital converter 112 pairs of electric currents are sampled, and described sample rate current Ic is exported to described computing module 120 and comparison module 130, carry out calculating and comparing to facilitate described computing module 120 and comparison module 130.Described analog to digital converter 112 is preferably flash analog/digital converter, and to be not less than the electric current of the sampling rate collection point fire coil of 100kS/s, i.e. the collector current of IGBT, obtains the value of sample rate current Ic.In FIG, an input end FADCP of described analog to digital converter 112 connects one end of described sampling resistor 111, and another input end FADCN of described analog to digital converter 112 connects the other end of described sampling resistor 111, and difference is sampled, to reduce the impact on sampling.
Described computing module 120 connects described sampling module 110 to receive described sample rate current Ic, obtains an energy integral according to described sample rate current Ic.In the present embodiment, described energy integral comprises overcurrent anomalous integral and crosses energy integral, to be respectively used to diagnosis over current fault and to cross energy failure.
Described comparison module 130 connects described sampling module 110 to receive described sample rate current Ic, is compared by a described sample rate current Ic and current threshold Ith_sc, and described current threshold Ith_sc allows the maximum short circuit current by described IGBT pipe.In addition, described comparison module 130 also connects described computing module 120 to receive described energy integral, and described energy integral and energy threshold is compared, and described energy threshold is the maximum heat allowed in certain hour.
Described judge module 140 connects described comparison module 130, according to the comparative result of described comparison module 130, judges whether the cylinder at described ignition coil C1, C2, C3, C4 place breaks down.
For the loop of driving electronic control ignition system in whole, the weakest parts are IGBT pipe not necessarily, it may be also described sampling resistor 111, PCB (PrintedCircuitBoard, printed-wiring board (PWB)) cabling, ECU connector stitch etc., wherein, sampling resistor 111, PCB (PrintedCircuitBoard, printed-wiring board (PWB)) cabling, ECU connector stitch all can process by the mode of resistance energy accumulation.Preferably; judge in order to can the weakest parts in loop be selected flexibly carry out and protect; described fault diagnosis circuit 1 also comprises a selection module 150; described selection module 150 is selected to select the parts that overcurrent is the weakest according to an overcurrent image parameter table; described overcurrent image parameter table is included in the weakest parts of overcurrent under different operating mode, and described overcurrent image parameter table can be a bivariate table.Described selection module 150 connects described computing module 120, described computing module 120 according to the selection result of described selection module 150, the overcurrent integration of parts the weakest described in calculating.
Below, the using method of described fault diagnosis circuit is illustrated.With reference to figure 2, be described to diagnose the cylinder at described ignition coil C1 place whether to break down.When described ignition coil C1 lights a fire, the control signal Vg that the grid g of described IGBT pipe P1 receives is useful signal, and described IGBT pipe P1 charges.One end of the armature winding of described ignition coil C1 connects power supply B, the other end of the armature winding of described ignition coil C1 connects the collector c of described IGBT pipe P1, one end of one end spark plug S1 of the secondary winding of described ignition coil C1, the other end ground connection of the secondary winding of described ignition coil C1, an another end ground connection of spark plug S1.
Specifically in the present embodiment, between the charge period of described power switch pipe P1, the diagnosis of short trouble and the diagnosis of over current fault is carried out.
The diagnosis and protection of short trouble:
Between the charge period of described power switch pipe, described sampling module 110 is sampled to the electric current (namely flowing through the electric current of the armature winding of ignition coil) flowing through IGBT pipe P1, obtains described sample rate current Ic.Described sample rate current Ic flows to described comparison module 130 after filtering, and described sample rate current Ic and current threshold Ith_sc compares by described comparison module 130 in real time.Described judge module 140 judges according to comparative result; as as described in sample rate current Ic be more than or equal to as described in current threshold Ith_sc, be equivalent to K switch in Fig. 21 and close, be i.e. short circuit; then turn off described IGBT pipe P1 in 10us fast to protect IGBT pipe P1, and 1 is added to the short circuit counter of this cylinder.If this cylinder is consecutively detected X1 short circuit, then judge that this cylinder is short trouble; If the continuous fault that is not short-circuited for Y1 time of this cylinder, then remove confirmed short trouble.Wherein, X1, Y1 are setting value, can demarcate, and do not do concrete restriction.
In the present embodiment, before no matter short trouble occurs in described power switch pipe P1 conducting or after notice, all can be diagnosed.With reference to figure 4, Fig. 5, in figures 4 and 5, horizontal ordinate all represents time t.As shown in Figure 4, in the t0 moment, control signal Vg is invalid signals, the non-conducting of described power switch pipe P1; In the t1 moment, control signal Vg becomes useful signal, described power switch pipe P1 conducting, and described power switch pipe P1 starts charging, and now, be short-circuited fault, and described sample rate current Ic rises fast; In the t2 moment, described sample rate current Ic reaches peak value, turns off described IGBT pipe P1 fast in 10us; In the t3 moment, control signal Vg is invalid signals, described power switch pipe P1 not conducting.As seen from Figure 4, short trouble can diagnose out short trouble before occurring in described power switch pipe P1 conducting.
As shown in Figure 5, in the t4 moment, control signal Vg becomes useful signal, described power switch pipe P1 conducting, and described power switch pipe P1 charges; In the t5 moment, occur short trouble, described sample rate current Ic rises fast; In the t6 moment, described sample rate current Ic reaches peak value, turns off described IGBT pipe P1 fast in 10us.As seen from Figure 5, short trouble occurs in described power switch pipe P1 conduction period, can diagnose out short trouble.
The diagnosis and protection of over current fault:
Between the charge period of described power switch pipe, described sampling module 110 is sampled to the electric current (namely flowing through the electric current of the armature winding of ignition coil) flowing through IGBT pipe P1, obtains described sample rate current Ic.Described computing module 120 receives described sample rate current Ic, and described computing module 120 obtains described overcurrent integration according to described sample rate current Ic.
In the present embodiment, described selection module 150 is first selected the parts that overcurrent is the weakest, if the weakest described parts are IGBT pipe P1, to the product of the voltage Vce then between the electric current I c of IGBT pipe P1 and the collector c of IGBT pipe P1 to emitter e to time integral, judge overcurrent.
During overcurrent, power gathers, and characterizes time integral IGBT pipe P1 available current.
Power P a=Vce × the Ic of IGBT pipe P1
Overcurrent integration is
W1＝∫Pa(t)dt＝∫Vce(t)×Ic(t)dt
When IGBT pipe P1 characteristic shows overcurrent, Vce change is little, if Vce=k1, k1 are constant (dimension: volt), then overcurrent integration is
W1＝∫Pa(t)dt＝∫Vce(t)×Ic(t)dt＝k1∫Ic(t)dt
The detection of overcurrent is reduced to the integration to Current versus time, reduces MCU resource requirement.
Described comparison module 130 receives described overcurrent integration W1, is compared by a described overcurrent integration W1 and overcurrent threshold value Wth_oc, and described overcurrent threshold value Wth_oc is the maximum heat that described IGBT pipe P1 allows.Described judge module 140 judges according to comparative result, as described in overcurrent integration W1 be more than or equal to as described in overcurrent threshold value Wth_oc, i.e. this cylinder overcurrent, turn off described IGBT pipe P1 immediately, to protect described IGBT pipe P1, and 1 added to the mistake flow counter of this cylinder.If this cylinder is consecutively detected X2 overcurrent, then judge that this cylinder is over current fault; If this cylinder over current fault does not occur continuous Y2 time, then remove confirmed over current fault.Wherein, X2, Y2 are setting value, can demarcate, and do not do concrete restriction.
If described selection module 150 select described in the weakest parts be resistance, process by the mode of resistance energy accumulation.For the energy ezpenditure of resistance, available current square is multiplied by resistance and characterizes time integral.
The power of resistance is Pr=Ic
2× R, R are the resistance of resistance,
The overcurrent integration of resistance is
W1′＝∫Pr(t)dt＝∫Ic
2(t)×Rdt
In described IGBT pipe P1 turn on process, the change in resistance of resistance is very little, does not change approximate by the resistance of resistance, then the overcurrent integration of resistance is
W1′＝∫Pr(t)dt＝∫Ic
2(t)×Rdt＝R∫Ic
2(t)dt
This algorithm, the detection of overcurrent is reduced to the integration of Current versus time, reduces MCU resource requirement.
Described comparison module 130 receives described overcurrent integration W1 ', described overcurrent integration W1 ' and an overcurrent threshold value Woc_R is compared, and described overcurrent threshold value Woc_R is the maximum heat that described resistance allows.Described judge module 140 judges according to comparative result, as described in overcurrent integration W1 ' be more than or equal to as described in overcurrent threshold value Woc_R, i.e. this cylinder overcurrent, turn off described IGBT pipe P1 immediately, to protect described IGBT pipe P1, and 1 added to the mistake flow counter of this cylinder.If this cylinder is consecutively detected X3 overcurrent, then judge that this cylinder is over current fault; If this cylinder over current fault does not occur continuous Y3 time, then remove confirmed over current fault.Wherein, X3, Y3 are setting value, can demarcate, and do not do concrete restriction.
With reference to figure 6, in figure 6, horizontal ordinate all represents time t.As shown in Figure 6, in the t7 moment, control signal Vg is invalid signals, the non-conducting of described power switch pipe P1; In the t8 moment, control signal Vg becomes useful signal, described power switch pipe P1 conducting, and described power switch pipe P1 starts charging, and the sample rate current of overcurrent 1 and the sample rate current of overcurrent 2 are all greater than sample rate current when charging normal; In the t9 moment, control signal Vg is invalid signals, described power switch pipe P1 not conducting.As seen from Figure 6, over current fault can be diagnosed and be detected easily.
Cross the diagnosis and protection of energy failure:
Carry out in tens microseconds that the diagnosis of crossing energy started in the charge period finish time of described power switch pipe, namely control signal Vg become low after tens microseconds in carry out.See Fig. 7.In the figure 7, horizontal ordinate all represents time t.As shown in Figure 7, in the t10 moment, control signal Vg is useful signal, described power switch pipe P1 conducting, and described power switch pipe P1 charges; In the t11 moment, control signal Vg becomes invalid signals, and described power switch pipe P1 turns off, and described power switch pipe P1 discharges; In the t12 moment, fault offset is complete.If if the energy in ignition coil C1 is too much, can not completely by secondary release, can only again by elementary release, very large to described IGBT pipe P1 loss.
Normal turn-off situation, sample rate current Ic rapidly drops to 0A, and the secondary situation that can not release energy completely, sample rate current Ic declines close to after 0A, not necessarily drops to 0A completely, as Fig. 7, but again rise to very large electric current, close to the electric current turning off the moment, then decline; Sometimes also repeatedly can reduce, rise, this process time about tens microsecond.And the collector of described IGBT pipe P1-transmitting voltage across poles Vce is because the clamp effect of described IGBT pipe P1, keep very high clamping voltage, about 400V, produce very large power (Ic*Vce, several kilowatts), continue tens microseconds, these energy ezpenditure, in described IGBT pipe P1, described IGBT pipe P1 produce very large heat accumulation.
At the interdischarge interval of described power switch pipe, described sampling module 110 is sampled to the electric current (namely flowing through the electric current of the armature winding of ignition coil) flowing through IGBT pipe P1, obtains described sample rate current Ic.Described computing module 120 receives described sample rate current Ic, and described computing module 120 obtains described energy integral excessively according to described sample rate current Ic.
Power P b=Vce × the Ic of described IGBT pipe P1
The energy integral of described IGBT pipe P1 is
∫W2＝∫Pb(t)dt＝∫Vce(t)×Ic(t)dt
Vce change is little, if Vce=k2, k2 are constant (dimension: volt), then the energy integral of described IGBT pipe P1 is
∫W2＝∫Pb(t)dt＝∫Vce(t)×Ic(t)dt＝k2∫Ic(t)dt
This algorithm, can be reduced to the integration to Current versus time, reduce MCU resource requirement by the detection of crossing energy.
Described comparison module 130 receives describedly crosses energy integral W2, the described energy integral W2 of mistake and is crossed energy threshold Wth_oe and compares, and describedly crosses the maximum heat that energy threshold Wth_oe is described IGBT pipe P1 permission.Described judge module 140 judges according to comparative result, as as described in cross energy integral W2 and be more than or equal to described mistake energy threshold Wth_oe, namely energy crossed by this cylinder, adds 1 to the mistake flow counter of this cylinder, and reduce the duration of charging of this cylinder in next circulation, to reduce rechargeable energy.If this cylinder is consecutively detected X4 time and crosses energy, then judge that this cylinder was energy failure; If this cylinder energy failure did not occur continuous Y4 time, then removed confirmed energy failure excessively.Wherein, X4, Y4 are setting value, can demarcate, and do not do concrete restriction.
For there being Cylinder, then close the igniting of this cylinder, oil spout function; If fault is removed, then reopen the igniting of this cylinder, oil spout function.
Preferably, in the present embodiment, between the charge period of described power switch pipe IGBT pipe P1, also according to described ignition coil C1 whether no current, judge whether the cylinder at described ignition coil C1 place occurs open fault, when whether the cylinder at described ignition coil C1 place occurs open fault, the K switch 2 be equivalent in Fig. 2 disconnects.
Those having ordinary skill in the art will appreciate that, when described power switch pipe is BIP pipe etc., similar method can also be adopted to diagnose, its concrete implementation step is similar with above-described embodiment of the present utility model to thinking, under the enlightenment of the utility model embodiment, the extension of this application is easy to understand and realization for those of ordinary skill in the art, does not repeat them here.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (10)
1. drive the fault diagnosis circuit of electronic control ignition system in one kind, drive electronic control ignition system in described and comprise microprocessor, predrive element and power switch pipe, one output terminal of described microprocessor connects grid or the base stage of described power switch pipe by described predrive element, the collector of described power switch pipe connects an ignition coil, the grounded emitter of described power switch pipe, it is characterized in that, described fault diagnosis circuit comprises:
Sampling module, samples to the electric current flowing through described power switch pipe, obtains sampled current value;
Computing module, connects described computing module, and described computing module receives described sample rate current, obtains an energy integral according to described sample rate current;
Comparison module, connects described sampling module and computing module, and described comparison module receives described sample rate current and energy integral, described sample rate current and a current threshold is compared, and described energy integral and energy threshold is compared; And
Judge module, connects described comparison module, according to the comparative result of described comparison module, judges whether the cylinder at described ignition coil place breaks down.
2. drive the fault diagnosis circuit of electronic control ignition system in as claimed in claim 1, it is characterized in that,
Between the charge period of described power switch pipe:
Described comparison module receives described sample rate current, described sample rate current and current threshold is compared, and whether described judge module is more than or equal to described current threshold according to described sample rate current, judges whether the cylinder at described ignition coil place occurs short trouble; Simultaneously, described computing module receives described sample rate current, described computing module obtains an overcurrent integration according to described sample rate current, described comparison module receives described overcurrent integration, described overcurrent integration and an overcurrent threshold value are compared, whether described judge module is more than or equal to described overcurrent threshold value according to described overcurrent integration, judges whether the cylinder at described ignition coil place occurs over current fault;
Interdischarge interval at described power switch pipe:
Described computing module receives described sample rate current, described computing module obtains one according to described sample rate current and crosses energy integral, described comparison module reception is described crosses energy integral, described energy integral excessively and one are crossed energy threshold compare, whether described judge module is more than or equal to described energy threshold excessively according to described energy integral excessively, judges whether the cylinder at described ignition coil place occurred energy failure.
3. in as claimed in claim 2, drive the fault diagnosis circuit of electronic control ignition system, it is characterized in that, between the charge period of described power switch pipe, described judge module also according to described ignition coil whether no current, judges whether the cylinder at described ignition coil place occurs open fault.
4. in as claimed in claim 2, drive the fault diagnosis circuit of electronic control ignition system, it is characterized in that, described fault diagnosis circuit also comprises a selection module, described selection module is selected to select the parts that overcurrent is the weakest according to an overcurrent image parameter table, described overcurrent image parameter table is included in the weakest parts of overcurrent under different operating mode, computing module described in described selection model calling, described computing module according to the selection result of described selection module, the overcurrent integration of parts the weakest described in calculating.
5. drive the fault diagnosis circuit of electronic control ignition system in as claimed in claim 4, it is characterized in that, the weakest described parts are power switch pipe, and the formula that described computing module calculates overcurrent integration is:
W1＝k1∫Ic(t)dt
Wherein, W1 is the overcurrent integration of described power switch pipe, and k1 is constant, and Ic is described sample rate current, and t is the time.
6. drive the fault diagnosis circuit of electronic control ignition system in as claimed in claim 4, it is characterized in that, the weakest described parts are resistance, and the formula that described computing module calculates overcurrent integration is:
W1′＝R∫Ic
2(t)dt
Wherein, the overcurrent integration that W1 ' is described resistance, R is the resistance of described resistance, and Ic is described sample rate current, and t is the time.
7. drive the fault diagnosis circuit of electronic control ignition system in as claimed in claim 2, it is characterized in that, the formula of the calculated energy integral of described computing module is:
W2＝k2∫Ic(t)dt
Wherein, W2 is the energy integral of described power switch pipe, and k2 is constant, and Ic is described sample rate current, and t is the time.
8. in as claimed in claim 1, drive the fault diagnosis circuit of electronic control ignition system, it is characterized in that, described sampling module comprises a sampling resistor, and one end of described sampling resistor is connected to source electrode or the emitter of described power switch pipe, the other end ground connection of described sampling resistor.
9. in as claimed in claim 1, drive the fault diagnosis circuit of electronic control ignition system, it is characterized in that, described sampling module also comprises an analog to digital converter, described analog to digital converter connects described sampling resistor, computing module and comparison module, described analog to digital converter is the analog to digital converter of described microprocessor, described computing module is the computing module of described microprocessor, and described comparison module is the comparison module of described microprocessor, and described judge module is the judge module of described microprocessor.
10. as in one of claimed in any of claims 1 to 9 in drive the fault diagnosis circuit of electronic control ignition system, it is characterized in that, drive electronic control ignition system in described and comprise multiple described power switch pipe, all described power switch pipes share same described sampling module; Or multiple described power switch pipe connects a described sampling module separately separately; Or the described power switch pipe at interval shares same described sampling module successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460687.7U CN204790553U (en) | 2015-06-30 | 2015-06-30 | A fault diagnosis circuit for an inner drive electronic control igniting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460687.7U CN204790553U (en) | 2015-06-30 | 2015-06-30 | A fault diagnosis circuit for an inner drive electronic control igniting system |
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| CN204790553U true CN204790553U (en) | 2015-11-18 |
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| CN201520460687.7U Withdrawn - After Issue CN204790553U (en) | 2015-06-30 | 2015-06-30 | A fault diagnosis circuit for an inner drive electronic control igniting system |
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Cited By (5)
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| CN105896990A (en) * | 2016-04-21 | 2016-08-24 | 江苏科技大学 | Electric vehicle power supply buck chopper circuit |
| CN105988463A (en) * | 2015-06-30 | 2016-10-05 | 联合汽车电子有限公司 | Fault diagnosis circuit and fault diagnosis method of internal drive electronic control ignition system |
| CN111835323A (en) * | 2019-04-17 | 2020-10-27 | 联合汽车电子有限公司 | Internal drive ignition IGBT overload protection method and device |
| CN111828225A (en) * | 2020-06-24 | 2020-10-27 | 联合汽车电子有限公司 | Control method and control circuit of internal drive ignition system |
| CN112124145A (en) * | 2019-06-24 | 2020-12-25 | 联合汽车电子有限公司 | Calculation method of charging time of networked electric vehicle on demand and charging control system |
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2015
- 2015-06-30 CN CN201520460687.7U patent/CN204790553U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105988463A (en) * | 2015-06-30 | 2016-10-05 | 联合汽车电子有限公司 | Fault diagnosis circuit and fault diagnosis method of internal drive electronic control ignition system |
| CN105988463B (en) * | 2015-06-30 | 2018-10-19 | 联合汽车电子有限公司 | The interior fault diagnosis circuit and its method for diagnosing faults for driving electronic control ignition system |
| CN105896990A (en) * | 2016-04-21 | 2016-08-24 | 江苏科技大学 | Electric vehicle power supply buck chopper circuit |
| CN111835323A (en) * | 2019-04-17 | 2020-10-27 | 联合汽车电子有限公司 | Internal drive ignition IGBT overload protection method and device |
| CN112124145A (en) * | 2019-06-24 | 2020-12-25 | 联合汽车电子有限公司 | Calculation method of charging time of networked electric vehicle on demand and charging control system |
| CN111828225A (en) * | 2020-06-24 | 2020-10-27 | 联合汽车电子有限公司 | Control method and control circuit of internal drive ignition system |
| CN111828225B (en) * | 2020-06-24 | 2021-12-07 | 联合汽车电子有限公司 | Control method and control circuit of internal drive ignition system |
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