CN203849610U - 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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- CN203849610U CN203849610U CN201420134826.2U CN201420134826U CN203849610U CN 203849610 U CN203849610 U CN 203849610U CN 201420134826 U CN201420134826 U CN 201420134826U CN 203849610 U CN203849610 U CN 203849610U
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Abstract
The application discloses a fault diagnosis circuit for an inner drive electronic control igniting system. According to the inner drive electronic control igniting system, a microcontroller, a resistor and a switch device are arranged in an ECU of a vehicle. One output terminal of the microcontroller is connected with a grid electrode of the switch device through the resistor. A drain electrode or a collector electrode of the switch device is connected to an end of a primary coil. According to the fault diagnosis circuit, a sampling resistor, a comparator, a series resistor and a feedback resistor are also included in the ECU. On end hand, a source electrode or an emitting electrode of the switch device is grounded through the sampling resistor, and on the other hand, the source electrode or the emitting electrode of the switch device is connected with a first input terminal of the comparator through the series resistor. A second input terminal of the comparator is grounded through the series resistor. The feedback resistor is connected with the first input terminal and an output terminal of the comparator. The output terminal of the comparator is connected with an input terminal of the microcontroller. According to the fault diagnosis circuit for the inner drive electronic control igniting system of the application, igniting diagnosis of the inner drive electronic control igniting system can be realized; an igniting driving chip and the ECU can be protected; after-sale maintenance costs can be reduced; and dual benefits in terms of economy and technology can be achieved.
Description
Technical field
The application relates to a kind of petrolic electronic control ignition system, particularly relates to the fault diagnosis circuit of ignition coil wherein.
Background technology
Petrolic electronic control technology progressively develops into comprehensive engine management system (EMS), and it mainly comprises electronic fuel injection (EFI), electronic control ignition (ESA) etc.Electronic control ignition system is wherein to be arranged on the various sensor signals on engine different parts by the collection of the electronic control unit (ECU) of engine, the operating condition of judgement engine, select optimal ignition advance angle that ignition coil is lighted a fire, thereby improve the combustion process of engine.
In electronic control ignition system, ECU produces larger drive current by ignition drive circuit, thereby realizes the driving to ignition coil.At present, ignition drive circuit can be integrated on chip piece, is called igniting and drives chip.According to igniting, drive the position of chip, in electronic control ignition system can being divided into, drive and drive two kinds outward.Inside drive electronic control ignition system and refer to that igniting drives integrated chip inner at ECU; Drive electronic control ignition system outward and refer to that igniting drives integrated chip inner at ignition coil.Once there is the fault of long-time overcurrent in ignition coil, driving outside electronic control ignition system can drive chip to burn ignition coil and igniting, thereby in the interior electronic control ignition system of driving, igniting driving chip can be burnt whole ECU is scrapped, thereby be necessary ignition coil to carry out fault diagnosis.
Refer to Fig. 1 a, this is a kind of principle schematic diagram that drives electronic control ignition system in existing.The main transformer device structure that adopts of ignition coil 2, comprises the primary coil 21 and the secondary coil 22 that are wrapped on iron core 23.One end of primary coil 21 and secondary coil 22 is all connected Vehicular direct-current power supply 1, and the other end of secondary coil 22 connects an electrode of spark plug 4, another electrode grounding of spark plug 4.Inside at the ECU5 of engine includes microcontroller (MCU) 51, resistance 1 and switching device 53.Resistance 1 wherein and switching device 53 have jointly formed igniting and have driven chip.Switching device 53 is such as being MOS transistor, IGBT device etc.An output terminal of MCU51 is by grid or the base stage of resistance one 52 connecting valve devices 53.The drain electrode of switching device 53 or collector connect the other end of primary coil 21.The source electrode of switching device 53 or grounded emitter.
While not working, MCU51 is to grid or the base stage output low level of switching device 53, and switching device 53 is equivalent to the switch of a disconnection in off state.
During work, MCU51 is to grid or the base stage output high level of switching device 53, and switching device 53 is equivalent to a closed switch in conducting state.Now Vehicular direct-current power supply 1 is connected primary coil 21.As without external operation, the electric current (being primary current) by primary coil 21 will increase from zero to a stationary value, and this stationary value is determined by the magnitude of voltage of Vehicular direct-current power supply 1 and the resistance value of primary coil 21.Along with primary current increases, the electromagnetic energy that primary coil 21 produces is stored in iron core 23.When primary current reaches certain value (this certain value≤stationary value), MCU51 changes into the grid of switching device 53 or base stage output low level, and switching device 53 becomes shutoff from conducting, and this makes primary coil loops moment disconnection.The electric field sudden change of primary coil loops has caused the magnetic field of primary coil 21 to decay rapidly, thereby induces high-tension electricity kinetic potential at the two ends of secondary coil 22.Space between two electrodes of this high-tension electricity kinetic potential disruptive spark plug 4, produces electric arc to light the combination gas of gasoline and air.
Refer to Fig. 1 b, this is the another kind of principle schematic diagram that drives electronic control ignition system in existing.Ignition coil 2 still adopts transformer device structure, comprises the primary coil 21 and the secondary coil 22 that are wrapped on iron core 23.Spark plug 4 adopts dual ignition plug structure, spark plug 1 and 2 42, spark plug, consists of.The two ends of secondary coil 22 connect respectively an electrode of spark plug 1, spark plug 2 42, the equal ground connection of another electrode of spark plug 1, spark plug 2 42.All the other structures of Fig. 1 b are all identical with Fig. 1 a, and principle of work is also identical with Fig. 1 a, the high-tension electricity kinetic potential that just two ends of secondary coil 22 induce together with time disruptive spark plug 1, spark plug 2 42 two electrodes between space.
Refer to Fig. 1 c, this is another principle schematic diagram that drives electronic control ignition system in existing.Ignition coil 2 still adopts transformer device structure, comprises the primary coil 21 and the secondary coil 22 that are wrapped on iron core 23.One end ground connection of secondary coil 22, the other end connects an electrode of spark plug 4, another electrode grounding of spark plug 4.All the other structures of Fig. 1 c are all identical with Fig. 1 a, and principle of work is also identical with Fig. 1 a,
Refer to Fig. 2, the ignition coil of same model (is for example 3A from starting to be charged to primary current arrival specific current value under identical operating voltage, certain value when this specific current value≤MCU51 changes output level state to the grid of switching device 53 or base stage) time is basic identical, as shown in curve A.When having there is the over current fault of igniting driving chip, the relation in its primary current and duration of charging is as shown in curve B.When the open fault of igniting driving chip, primary coil no current have occurred.According to this characteristic, can design the fault diagnosis scheme that drives chip for igniting.
A kind of igniting of driving electronic control ignition system in existing drives chip diagnosis scheme to adopt hardware means, for igniting drives the peripheral diagnostic circuit of switching device 53 specialized designs in chip, failure message is fed back to MCU51, and MCU51 reads corresponding failure message identification fault.Petrol engine has multi-cylinder conventionally, four cylinders for example, and each cylinder all corresponding independently igniting drives chip.This scheme drives chip will design complicated diagnostic circuit for each igniting, will distribute the resource of ECU be used for read failure information for each igniting drives chip simultaneously, realizes cost compare costliness.
The igniting of driving electronic control ignition system in another kind is existing drives chip diagnosis scheme to adopt software approach, trigger mode number converter (ADC) primary current of collection point fire coil 2 rapidly in ignition coil 2 charging, MCU51 calculates the time that starts to arrive specific current value from charging according to collection value, and this time and the duration of charging of normal ignition coil are compared and then judge the fault that igniting drives chip.This scheme expends more MCU resource, has also increased software complexity and risk simultaneously.
Summary of the invention
The application's technical matters to be solved is to provide the fault diagnosis circuit that drives the ignition coil of electronic control ignition system in a kind of.
For solving the problems of the technologies described above, the application provides the fault diagnosis circuit that drives electronic control ignition system in a kind of.In described, driving electronic control ignition system is to be provided with microcontroller, resistance one and switching device in the ECU inside of petrol engine vehicles; An output terminal of microcontroller is by grid or the base stage of resistance one connecting valve device; The source electrode of switching device or grounded emitter; The drain electrode of switching device or collector connect the first end of primary coil; The second end of primary coil connects Vehicular direct-current power supply;
Described fault diagnosis circuit is in described ECU inside, also to include sampling resistor, comparer, feedback resistance and two resistance in seriess; Feedback resistance connects first input end and the output terminal of comparer; The output terminal of comparer connects an input end of microcontroller; Remaining part adopts one of following three kinds of connected modes;
The first connected mode: the source electrode or the emitter that " source electrode of switching device or grounded emitter " are changed into switching device pass through sampling resistor ground connection on the one hand, connect on the other hand the first input end of comparer by resistance in series one; The second input end of comparer is by resistance in series two ground connection;
The second connected mode: the first end that " drain electrode of switching device or collector connect the first end of primary coil " is changed into primary coil passes through drain electrode or the collector of sampling resistor connecting valve device on the one hand, connects on the other hand the first input end of comparer by resistance in series one; The second input end of comparer is by drain electrode or the collector of resistance in series two connecting valve devices;
The third connected mode: will " the second end of primary coil connects Vehicular direct-current power supply " change Vehicular direct-current power supply into and connect on the one hand the second end of primary coil by sampling resistor, and connect on the other hand the first input end of comparer by resistance in series one; The second input end of comparer connects the second end of primary coil by resistance in series two.
Further, described switching device is MOS transistor or IGBT device.
Further, in described feedback resistance, resistance in series one and resistance in series two, be partly or entirely adjustable resistance.
The application drives the igniting diagnosis and protection of electronic control ignition system in can realizing, protection igniting drives chip not to be burned, and also prevents from, because the damage of Ignition chip causes whole ECU to scrap, reducing after-sales service cost, obtains the double benefit of economy and technology.
Accompanying drawing explanation
Fig. 1 a～Fig. 1 c is three kinds of structural representations that drive electronic control ignition system in existing;
Fig. 2 is the primary current of ignition coil and the relation curve schematic diagram in duration of charging;
Fig. 3 a～Fig. 3 c is three kinds of structural representations that drive the fault diagnosis circuit of electronic control ignition system in the application;
Fig. 4 is the schematic diagram that drives the diagnostic method of electronic control ignition system in the application;
Fig. 5 is the process flow diagram that drives the diagnostic method of electronic control ignition system in the application;
Fig. 6 is the schematic diagram of the normal ignition (not overlapping) of four-cylinder gasoline engine.
Description of reference numerals in figure:
1 is Vehicular direct-current power supply; 2 is transformer; 21 is primary coil; 22 is secondary coil; 23 is iron core; 3 is switch; 4 is spark plug; 41 is spark plug one; 42 is spark plug two; 5 is ECU; 51 is MCU; 52 is resistance one; 53 is switching device; 54 is sampling resistor; 55 is comparer; 56 is feedback resistance; 57 is resistance in series one; 58 is resistance in series two.
Embodiment
Refer to Fig. 3 a, this is the embodiment mono-that drives the fault diagnosis circuit of electronic control ignition system in the application.This embodiment mono-drives on the basis of electronic control ignition system in as shown in Figure 1a existing, inside at the ECU5 of petrol engine vehicles has increased sampling resistor 54, comparer 55, feedback resistance 56, resistance in series 1 and resistance in series 2 58 newly, and they have formed fault diagnosis circuit jointly.Described feedback resistance 56, resistance in series 1 and resistance in series 2 58 for example adopt adjustable resistance.In existing, drive in electronic control ignition system the source electrode of switching device 53 or grounded emitter.The application changes into and makes the source electrode of switching device 53 or emitter pass through on the one hand sampling resistor 54 ground connection, connects on the other hand the first input end of comparers 55 by resistance in series 1.The second input end of comparer 55 is by resistance in series 2 58 ground connection.Feedback resistance 56 connects first input end and the output terminal of comparer 55.The output terminal of comparer 55 connects an input end of microcontroller 51.Similarly, this embodiment mono-also can drive on the basis of electronic control ignition system in existing as shown in Fig. 1 b, Fig. 1 c, at the newly-increased fault diagnosis circuit as shown in Figure 3 a in inside of the ECU5 of petrol engine vehicles.
Refer to Fig. 3 b, this is the embodiment bis-that drives the fault diagnosis circuit of electronic control ignition system in the application.This embodiment bis-drives on the basis of electronic control ignition system in as shown in Figure 1a existing, inside at the ECU5 of petrol engine vehicles has increased sampling resistor 54, comparer 55, feedback resistance 56, resistance in series 1 and resistance in series 2 58 newly, and they have formed fault diagnosis circuit jointly.Described feedback resistance 56, resistance in series 1 and resistance in series 2 58 for example adopt adjustable resistance.In existing, drive in electronic control ignition system drain electrode or the collector of that one end connecting valve device 53 that does not connect Vehicular direct-current power supply 1 of primary coil 21.The application changes into and makes that one end that does not connect Vehicular direct-current power supply 1 of primary coil 21 on the one hand by drain electrode or the collector of sampling resistor 54 connecting valve devices 53, connects on the other hand the first input end of comparer 55 by resistance in series 1.The second input end of comparer 55 is by drain electrode or the collector of resistance in series 2 58 connecting valve devices 53.Feedback resistance 56 connects first input end and the output terminal of comparer 55.The output terminal of comparer 55 connects an input end of microcontroller 51.Similarly, this embodiment bis-also can drive on the basis of electronic control ignition system in existing as shown in Fig. 1 b, Fig. 1 c, at the newly-increased fault diagnosis circuit as shown in Figure 3 b in inside of the ECU5 of petrol engine vehicles.
Refer to Fig. 3 c, this is the embodiment tri-that drives the fault diagnosis circuit of electronic control ignition system in the application.This embodiment tri-drives on the basis of electronic control ignition system in as shown in Figure 1a existing, inside at the ECU5 of petrol engine vehicles has increased sampling resistor 54, comparer 55, feedback resistance 56, resistance in series 1 and resistance in series 2 58 newly, and they have formed fault diagnosis circuit jointly.Described feedback resistance 56, resistance in series 1 and resistance in series 2 58 for example adopt adjustable resistance.In existing, drive in electronic control ignition system, Vehicular direct-current power supply 1 connects the drain electrode of not connecting valve device 53 or that one end of collector of primary coil 21.The application changes into and makes Vehicular direct-current power supply 1 by sampling resistor 54, connect on the one hand the drain electrode of not connecting valve device 53 or that one end of collector of primary coil 21, connects on the other hand the first input end of comparer 55 by resistance in series 1.The second input end of comparer 55 connects the drain electrode of not connecting valve device 53 or that one end of collector of primary coil 21 by resistance in series 2 58.Feedback resistance 56 connects first input end and the output terminal of comparer 55.The output terminal of comparer 55 connects an input end of microcontroller 51.Similarly, this embodiment tri-also can drive on the basis of electronic control ignition system in existing as shown in Fig. 1 b, Fig. 1 c, at the newly-increased fault diagnosis circuit as shown in Figure 3 c in inside of the ECU5 of petrol engine vehicles.
Petrol engine has multi-cylinder conventionally, four cylinders for example, and each cylinder all corresponding independently igniting drives chip.The application drives chip to be connected to same fault diagnosis circuit all igniting, and does not need, for each igniting drives chip, independent fault diagnosis circuit is set, thereby fault diagnosis circuit is simplified most.
Refer to Fig. 4 and Fig. 5, the diagnostic method that drives electronic control ignition system in the application is: sampling resistor 54 is converted to by the primary current of ignition coil 2 first input end that magnitude of voltage inputs to comparer 55.Described comparer 55 is compared the magnitude of voltage of the first input end threshold voltage built-in with comparer 55.Less the first level state, for example low level exported of magnitude of voltage when first input end.Otherwise output second electrical level state, for example high level.MCU51 sends high level from the grid to switching device 53 makes its conducting (being that ECU5 connects primary coil loops to ignition coil 2 transmission low levels) start timing, until changing output second electrical level state into by output the first level state, comparer 55 stops timing, the duration t of gained compares with default duration T, judges whether to have occurred fault.To be normal ignition coil start to reach characteristic current value (business's of the resistance of described threshold voltage and sampling resistor 54) duration to primary current from charging described default duration T.Under the prerequisite successfully being recorded at gained duration t, if gained duration t is significantly less than default duration T, for example t≤T/2, is preferably t≤T/10, shows that over current fault has occurred ignition coil 2; Otherwise show that ignition coil 2 is working properly.If sending high level from the grid to switching device 53, MCU51 make its conducting start timing, until changing into the grid of switching device 53, MCU51 sends in low level time section, comparer 55 is exported the first level state all the time, be that duration t cannot be successfully recorded to, show that open fault has occurred ignition coil 2.
Refer to Fig. 6, under normal circumstances, the igniting of petrolic each cylinder (four cylinders of take are example) is staggered mutually.Yet, also exist the overlapping fault of igniting, the duration of charging section of the ignition coil of difference cylinder has overlapping.Once there is the overlapping fault of igniting, just have the primary current of two ignition coils to be added on same sampling resistor within certain a period of time so, thereby affect follow-up deterministic process.The application monitors by ECU the overlapping fault of whether lighting a fire between each cylinder, once this fault be detected, stops carrying out diagnostic method, until this fault disappears, recovers to carry out diagnostic method again.
In practice, when MCU51 judges first some ignition coils a certain fault has occurred, can confirm immediately fault and take treatment measures, also can wait for and count until the same fault of this ignition coil is confirmed fault again and takes treatment measures after repeating to occur repeatedly.Described treatment measures comprise: the ignition function that masks the cylinder breaking down (is for example that MCU51 is all the time to switching device 53 output low levels, be that ECU5 sends high level to ignition coil 2 all the time, so that corresponding ignition coil 2 misfires all the time), to protect igniting to drive chip; Mask the oil spout function of the cylinder breaking down, to prevent from flooding cylinder simultaneously.Described treatment measures are only carried out in this duration of work of engine, once engine stop work, described treatment measures finish but exist the ignition coil of fault to go on record.
After engine start, if being recorded some ignition coils of certain fault in engine duration of work last time normally works, can remove immediately this kind of failure logging of this ignition coil, also can wait for and count until the normal work of this ignition coil is removed this kind of failure logging after repeating to occur repeatedly again.
Compared with prior art, the application's tool has the following advantages:
One, has realized the igniting diagnosis and protection that internally drives electronic control ignition system, and the fault solving due to ignition coil burns out the igniting driving chip of ECU inside and then the problem that whole ECU is scrapped.
Its two, with same fault diagnosis circuit, the ignition coil of all cylinders is carried out to fault diagnosis.Than being a set of peripheral diagnostic circuit of each igniting driving chip design, circuit structure is extremely simple, more can save cost.
Its three, can be widely used in all petrol engines on the markets such as 1 cylinder, 3 cylinders, 4 cylinders, 6 cylinders, 8 cylinders.
These are only the application's preferred embodiment, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the application's protection domain.
Claims (3)
1. in, drive a fault diagnosis circuit for electronic control ignition system, driving electronic control ignition system in described is to be provided with microcontroller, resistance one and switching device in the ECU inside of petrol engine vehicles; An output terminal of microcontroller is by grid or the base stage of resistance one connecting valve device; The source electrode of switching device or grounded emitter; The drain electrode of switching device or collector connect the first end of primary coil; The second end of primary coil connects Vehicular direct-current power supply;
It is characterized in that, described fault diagnosis circuit is in described ECU inside, also to include sampling resistor, comparer, feedback resistance and two resistance in seriess; Feedback resistance connects first input end and the output terminal of comparer; The output terminal of comparer connects an input end of microcontroller; Remaining part adopts one of following three kinds of connected modes;
The first connected mode: the source electrode or the emitter that " source electrode of switching device or grounded emitter " are changed into switching device pass through sampling resistor ground connection on the one hand, connect on the other hand the first input end of comparer by resistance in series one; The second input end of comparer is by resistance in series two ground connection;
The second connected mode: the first end that " drain electrode of switching device or collector connect the first end of primary coil " is changed into primary coil passes through drain electrode or the collector of sampling resistor connecting valve device on the one hand, connects on the other hand the first input end of comparer by resistance in series one; The second input end of comparer is by drain electrode or the collector of resistance in series two connecting valve devices;
The third connected mode: will " the second end of primary coil connects Vehicular direct-current power supply " change Vehicular direct-current power supply into and connect on the one hand the second end of primary coil by sampling resistor, and connect on the other hand the first input end of comparer by resistance in series one; The second input end of comparer connects the second end of primary coil by resistance in series two.
2. the fault diagnosis circuit that drives electronic control ignition system according to claim 1, is characterized in that, described switching device is MOS transistor or IGBT device.
3. the fault diagnosis circuit that drives electronic control ignition system according to claim 1, is characterized in that, in described feedback resistance, resistance in series one and resistance in series two is partly or entirely adjustable resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420134826.2U CN203849610U (en) | 2014-03-24 | 2014-03-24 | A fault diagnosis circuit for an inner drive electronic control igniting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420134826.2U CN203849610U (en) | 2014-03-24 | 2014-03-24 | A fault diagnosis circuit for an inner drive electronic control igniting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941720A (en) * | 2014-03-24 | 2014-07-23 | 联合汽车电子有限公司 | Fault diagnosis circuit and method of internal-drive electrically-controlled ignition system |
| WO2017084480A1 (en) * | 2015-11-18 | 2017-05-26 | 联合汽车电子有限公司 | Ignition system having high-voltage voltage-stabilized energy storage device |
| CN109100618A (en) * | 2017-06-20 | 2018-12-28 | 联合汽车电子有限公司 | High-tension battery Insulation Inspection System and method |
| 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 |
-
2014
- 2014-03-24 CN CN201420134826.2U patent/CN203849610U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941720A (en) * | 2014-03-24 | 2014-07-23 | 联合汽车电子有限公司 | Fault diagnosis circuit and method of internal-drive electrically-controlled ignition system |
| WO2017084480A1 (en) * | 2015-11-18 | 2017-05-26 | 联合汽车电子有限公司 | Ignition system having high-voltage voltage-stabilized energy storage device |
| CN109100618A (en) * | 2017-06-20 | 2018-12-28 | 联合汽车电子有限公司 | High-tension battery Insulation Inspection System and method |
| CN109100618B (en) * | 2017-06-20 | 2024-05-31 | 联合汽车电子有限公司 | High-voltage battery insulation detection system and method |
| 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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