CN111852675A - Fault diagnosis system for oil injector - Google Patents
Fault diagnosis system for oil injector Download PDFInfo
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- CN111852675A CN111852675A CN202010817924.6A CN202010817924A CN111852675A CN 111852675 A CN111852675 A CN 111852675A CN 202010817924 A CN202010817924 A CN 202010817924A CN 111852675 A CN111852675 A CN 111852675A
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- injector
- switch tube
- main controller
- diode
- pulse
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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
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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
- F02D2041/224—Diagnosis of the fuel system
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a fault diagnosis system of an oil sprayer, which relates to the field of oil sprayers and comprises the following components: the system comprises a main controller, a logic module, a high-end integrated drive circuit, a low-end current conditioning circuit, a first switch tube, a second switch tube, a third switch tube, a first diode, a second diode, a third diode and a sampling resistor, wherein the main controller acquires a high-end drive pulse signal of a source electrode of the second switch tube, and determines that a fault exists in the oil sprayer when the abnormal pulse width or pulse period of the high-end drive pulse signal is detected.
Description
Technical Field
The invention relates to the field of high-pressure common rail injectors of diesel engines, in particular to an injector fault diagnosis system.
Background
The oil injector is an important core part of a diesel engine, most common oil injector fault diagnosis technologies on the market at present are functional diagnosis, namely whether faults exist or not is judged according to whether fault phenomena of short circuit and open circuit exist in an oil injector driving circuit, but the electromagnetic force of the electromagnetic valve is insufficient due to the fact that inductance parameters are changed due to progressive aging of the electromagnetic valve of the oil injector, the oil injection characteristic of the oil injector is affected, the electromagnetic valve is a slowly changing process, the fault phenomena of short circuit or open circuit cannot be directly caused in the process, and the existing fault diagnosis technologies cannot identify the fault phenomena.
Disclosure of Invention
The invention provides a fault diagnosis system of an oil injector aiming at the problems and the technical requirements, and the technical scheme of the invention is as follows:
an oil injector fault diagnosis system comprises a main controller, a logic module, a high-side integrated driving circuit, a low-side current conditioning circuit, a first switch tube, a second switch tube, a third switch tube, a first diode, a second diode, a third diode and a sampling resistor, wherein the main controller is connected to the logic module, the logic module is connected to the high-side integrated driving circuit and the low-side integrated driving circuit, the high-side integrated driving circuit is connected to a grid electrode of the first switch tube and a grid electrode of the second switch tube, a drain electrode of the first switch tube is connected to a battery power supply for obtaining battery voltage, a source electrode of the first diode is connected to an anode of the first diode, a cathode of the first diode is connected to a cathode of the second diode, and an anode of the second diode is grounded, the drain electrode of the second switch tube is connected to a driving power supply to obtain driving high voltage, the source electrode of the second switch tube is connected to the cathode of the first diode, the cathode of the second diode and one end of an injector electromagnetic valve inductor of the injector, the other end of the injector electromagnetic valve inductor is connected to the anode of the third diode and the drain electrode of the third switch tube, the cathode of the third diode is connected to the driving power supply to obtain driving high voltage, the low-end integrated driving circuit is connected to the grid electrode of the third switch tube, the source electrode of the third switch tube is connected to the sampling resistor, the other end of the sampling resistor is grounded, two ends of the sampling resistor are respectively connected to the low-end current conditioning circuit, and the low-end current conditioning circuit is connected to the logic module,
and the main controller acquires a high-end driving pulse signal of a source electrode of the second switching tube, and determines that the oil injector has a fault when the pulse width or the pulse period of the high-end driving pulse signal is detected to be abnormal.
The driving process of the fuel injector sequentially comprises a high-pressure opening stage, a first-order maintaining stage and a second-order maintaining stage, and the step of determining that the fuel injector has faults when the abnormal pulse width and/or pulse period of the high-end driving pulse signal is detected comprises the following steps:
the main controller acquires a first pulse width when the oil injector is in a high-pressure opening stage, acquires a second pulse width and a first pulse period when the oil injector is in a first-order maintenance stage, and acquires a third pulse width and a second pulse period when the oil injector is in a second-order maintenance stage;
the main controller determines that the fuel injector has a fault when detecting that the first pulse width is different from a first preset width;
or determining that the fuel injector has a fault when the second pulse width is different from a second preset width or the first pulse period is different from a first preset period;
or determining that the fuel injector is in fault when detecting that the third pulse width is different from a third preset width or the second pulse period is different from a second preset period.
The further technical scheme is that the system further comprises:
in an experimental stage, a high-end driving pulse signal is led out from a source electrode of the second switch tube and is connected to the main controller, the main controller obtains the first preset width when the oil injector is in the high-pressure opening stage,
the main controller obtains the second predetermined width and the first predetermined period while the injector is in the first-order maintenance phase,
and the main controller acquires the third preset width and the second preset period when the fuel injector is in the second-order maintenance phase.
The further technical proposal is that the fuel injector fault diagnosis system also comprises a voltage limiting circuit, the source electrode of the second switch tube is connected to the main controller through the voltage limiting circuit,
the voltage limiting circuit limits the voltage amplitude of the high-side driving pulse signal to a level compatible with the main controller.
The main controller comprises a high-speed time processing unit, a control unit and a storage unit, wherein the high-speed time processing unit, the control unit and the storage unit are sequentially connected.
The further technical scheme is that the first switching tube, the second switching tube and the third switching tube are NMOS tubes.
The further technical scheme is that the fuel injector electromagnetic valve is controlled to be on or off by the inductance.
The further technical scheme is that the logic module comprises a CPLD.
The beneficial technical effects of the invention are as follows: the change of the pulse width or the pulse period of the high-end driving pulse signal directly reflects the change of the inductance parameter of the electromagnetic valve of the oil sprayer, the change of the inductance parameter of the electromagnetic valve of the oil sprayer can directly influence the oil injection characteristic of the oil sprayer, and the change of the pulse width or the pulse period of the high-end driving pulse signal can judge whether the oil injection characteristic of the oil sprayer has faults or not.
Drawings
Fig. 1 is a circuit configuration diagram of an injector drive circuit of the present application.
FIG. 2 is a circuit phase diagram of the injector driver circuit of the present application.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1, an injector fault diagnosis system includes a main controller MCU, a Logic module, a high-side integrated driver circuit, a low-side current conditioning circuit, a first switch tube M1, a second switch tube M2, a third switch tube M3, a first diode D1, a second diode D2, a third diode D3, and a sampling resistor R, where the Logic module includes a CPLD (Complex Programmable Logic Device) capable of adjusting its internal Logic on site, the Logic inside the CPLD is generated according to an external input signal and a Logic signal to be output, and the first switch tube M1, the second switch tube M2, and the third switch tube M3 are NMOS tubes.
The main controller MCU is connected to the logic module, the logic module is connected to the high-end integrated drive circuit and the low-end integrated drive circuit, the high-end integrated drive circuit is connected to the grid of the first switch tube M1 and the grid of the second switch tube M2, the drain of the first switch tube M1 is connected to the battery power to obtain the battery voltage, the source is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2, the anode of the second diode D2 is grounded, the drain of the second switch tube M2 is connected to the drive power to obtain the drive high voltage, the source of the second switch tube M2 is connected to the cathode of the first diode D1, the cathode of the second diode D2 and one end of the injector solenoid valve inductance L, and the injector solenoid valve inductance L controls the on-off of. The other end of the fuel injector solenoid valve inductor L is connected to the anode of a third diode D3 and the drain of a third switching tube M3, the cathode of the third diode D3 is connected to a driving power supply for obtaining driving high voltage, a low-end integrated driving circuit is connected to the grid of the third switching tube M3, the source of the third switching tube M3 is connected to a sampling resistor R, the other end of the sampling resistor R is grounded, two ends of the sampling resistor R are respectively connected to a low-end current conditioning circuit, and the low-end current conditioning circuit is connected to the logic module.
Because of the saturation characteristic of the inductor, namely the larger the current is, the larger the loss of the inductance characteristic is, the speed of the loss of the inductance characteristic is an important index of the electromagnetic valve characteristic, the characteristic of the electromagnetic valve is highly related to the oil injection characteristic of the oil injector, and the electromagnetic valve inductor L of the oil injector controls the on-off of the electromagnetic valve of the oil injector.
And the main controller MCU acquires a high-end driving pulse signal of the source electrode of the second switching tube M2, and determines that the injector has a fault when the pulse width or the pulse period of the high-end driving pulse signal is detected to be abnormal.
Further, as shown in fig. 2, the logic module is connected to the main controller MCU and receives a driving enable signal, where the high-side driving pulse signal and the driving enable signal both have a delay in the opening and closing stages, and generally the driving process of the injector sequentially includes a high-pressure opening stage t0-t1, a first-order maintenance stage t1-t2, and a second-order maintenance stage t2-t3, and when detecting that the pulse width and/or pulse period of the high-side driving pulse signal is abnormal, it is determined that the injector has a fault, including:
the method comprises the steps that a main controller MCU acquires a first pulse width T0 when an oil injector is in a high-pressure opening stage, acquires a second pulse width T1 and a first pulse period T1+ T2 when the oil injector is in a first-order maintenance stage, and acquires a third pulse width T3 and a second pulse period T3+ T4 when the oil injector is in a second-order maintenance stage;
the drive current of the fuel injector of a specific model has corresponding calibration values of three pulse widths, a first pulse period and a second pulse period.
The main controller MCU determines that the oil injector has a fault when detecting that the first pulse width is different from the first preset width;
or determining that the fuel injector has a fault when detecting that the second pulse width is different from the second preset width or the first pulse period is different from the first preset period;
alternatively, a fuel injector fault may be determined upon detecting that the third pulse width is different from the third predetermined width or that the second pulse period is different from the second predetermined period.
Each pulse width and pulse period reflects the change of the inductance parameter of the electromagnetic valve of the oil injector when different driving currents are adopted. A batch of fuel injectors of specific models can be selected firstly, and the fuel injectors have faults of fuel injection characteristic change in different degrees. And calibrating a relation table of pulse width, pulse period and fuel injection quantity by performing fuel injection performance tests on the fault fuel injectors. The pulse width and the pulse period reflect the change condition of the inductance parameter of the electromagnetic valve of the oil injector, so that the change rules of three pulse widths and two pulse periods are consistent. After each driving, the actual pulse width and pulse period values can be obtained, the actual fuel injection quantity can be obtained according to the relation table, whether the fuel injection characteristic of the fuel injector is in a normal range or has a fault can be judged according to the obtained fuel injection quantity value, and the severity of the fault can be further judged.
Further, in order to obtain a predetermined value, the predetermined value is obtained in an experimental stage before use, the predetermined value is obtained by measuring batch normal injectors, a high-end driving pulse signal is led out from the source electrode of the second switching tube M2 and is connected to the main controller MCU, the main controller MCU obtains a first predetermined width in a high-pressure opening stage of the injector,
the main controller MCU obtains a second preset width and a first preset period when the fuel injector is in a first-order maintenance phase,
and the main controller MCU acquires a third preset width and a second preset period when the fuel injector is in a second-order maintenance stage.
The system also comprises a voltage limiting circuit, the source electrode of the second switch tube M2 is connected to the main controller through the voltage limiting circuit, and the voltage limiting circuit limits the voltage amplitude of the high-end driving pulse signal to be the level compatible with the MCU because the pulse amplitude of the actual signal of the source electrode of the second switch tube M2 is larger.
The MCU of the main controller comprises a high-speed time processing unit TPU, a control unit DMA and a storage unit RAM, wherein the high-speed time processing unit TPU, the control unit DMA and the storage unit RAM are sequentially connected, the high-speed time processing unit TPU and the control unit DMA of the MCU of the main controller can automatically acquire the pulse width and the pulse period of a high-end driving pulse signal and automatically store the pulse width and the pulse period into the storage unit RAM, and the purpose of saving the space of the MCU of the main controller is achieved.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (8)
1. An oil injector fault diagnosis system is characterized by comprising a main controller, a logic module, a high-side integrated driving circuit, a low-side current conditioning circuit, a first switch tube, a second switch tube, a third switch tube, a first diode, a second diode, a third diode and a sampling resistor, wherein the main controller is connected to the logic module, the logic module is connected to the high-side integrated driving circuit and the low-side integrated driving circuit, the high-side integrated driving circuit is connected to a grid electrode of the first switch tube and a grid electrode of the second switch tube, a drain electrode of the first switch tube is connected to a battery power supply for obtaining battery voltage, a source electrode of the first switch tube is connected to an anode of the first diode, a cathode of the first diode is connected to a cathode of the second diode, and an anode of the second diode is grounded, the drain electrode of the second switch tube is connected to a driving power supply to obtain driving high voltage, the source electrode of the second switch tube is connected to the cathode of the first diode, the cathode of the second diode and one end of an injector electromagnetic valve inductor of the injector, the other end of the injector electromagnetic valve inductor is connected to the anode of the third diode and the drain electrode of the third switch tube, the cathode of the third diode is connected to the driving power supply to obtain driving high voltage, the low-end integrated driving circuit is connected to the grid electrode of the third switch tube, the source electrode of the third switch tube is connected to the sampling resistor, the other end of the sampling resistor is grounded, two ends of the sampling resistor are respectively connected to the low-end current conditioning circuit, and the low-end current conditioning circuit is connected to the logic module,
and the main controller acquires a high-end driving pulse signal of a source electrode of the second switching tube, and determines that the oil injector has a fault when the pulse width or the pulse period of the high-end driving pulse signal is detected to be abnormal.
2. The injector malfunction diagnosis system according to claim 1, wherein a driving process of the injector includes a high-pressure opening stage, a first-order maintenance stage, and a second-order maintenance stage in this order, and the determining that the injector malfunctions when detecting that a pulse width and/or a pulse period of the high-end driving pulse signal is abnormal includes:
the main controller acquires a first pulse width when the oil injector is in a high-pressure opening stage, acquires a second pulse width and a first pulse period when the oil injector is in a first-order maintenance stage, and acquires a third pulse width and a second pulse period when the oil injector is in a second-order maintenance stage;
the main controller determines that the fuel injector has a fault when detecting that the first pulse width is different from a first preset width;
or determining that the fuel injector has a fault when the second pulse width is different from a second preset width or the first pulse period is different from a first preset period;
or determining that the fuel injector is in fault when detecting that the third pulse width is different from a third preset width or the second pulse period is different from a second preset period.
3. The fuel injector fault diagnostic system of claim 2, characterized in that the system further comprises:
in an experimental stage, a high-end driving pulse signal is led out from a source electrode of the second switch tube and is connected to the main controller, the main controller obtains the first preset width when the oil injector is in the high-pressure opening stage,
the main controller obtains the second predetermined width and the first predetermined period while the injector is in the first-order maintenance phase,
and the main controller acquires the third preset width and the second preset period when the fuel injector is in the second-order maintenance phase.
4. The fuel injector fault diagnosis system according to claim 1, characterized by further comprising a voltage limiting circuit through which a source electrode of the second switching tube is connected to the main controller,
the voltage limiting circuit limits the voltage amplitude of the high-side driving pulse signal to a level compatible with the main controller.
5. The fuel injector fault diagnosis system according to claim 1, characterized in that the main controller includes a high-speed time processing unit, a control unit and a storage unit, and the high-speed time processing unit, the control unit and the storage unit are connected in sequence.
6. The fuel injector fault diagnosis system according to claim 1, characterized in that the first switching tube, the second switching tube and the third switching tube are all NMOS tubes.
7. The fuel injector fault diagnostic system of claim 1, characterized in that the fuel injector solenoid valve inductance controls on-off of a fuel injector solenoid valve.
8. The fuel injector fault diagnostic system of claim 1, characterized in that said logic module comprises a CPLD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010817924.6A CN111852675A (en) | 2020-08-14 | 2020-08-14 | Fault diagnosis system for oil injector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010817924.6A CN111852675A (en) | 2020-08-14 | 2020-08-14 | Fault diagnosis system for oil injector |
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| CN111852675A true CN111852675A (en) | 2020-10-30 |
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| CN202010817924.6A Pending CN111852675A (en) | 2020-08-14 | 2020-08-14 | Fault diagnosis system for oil injector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610344A (en) * | 2020-12-11 | 2021-04-06 | 哈尔滨工程大学 | Common rail injector fault diagnosis method based on CEEMD and improved level discrete entropy |
| CN113482824A (en) * | 2021-07-28 | 2021-10-08 | 潍柴动力股份有限公司 | Detection method and device of oil injector |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112610344A (en) * | 2020-12-11 | 2021-04-06 | 哈尔滨工程大学 | Common rail injector fault diagnosis method based on CEEMD and improved level discrete entropy |
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| CN113482824B (en) * | 2021-07-28 | 2022-06-28 | 潍柴动力股份有限公司 | Detection method and device for oil sprayer |
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