CN111828218A - Diagnosis method for abnormality of high-pressure common rail injector - Google Patents
Diagnosis method for abnormality of high-pressure common rail injector Download PDFInfo
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- CN111828218A CN111828218A CN201910298319.XA CN201910298319A CN111828218A CN 111828218 A CN111828218 A CN 111828218A CN 201910298319 A CN201910298319 A CN 201910298319A CN 111828218 A CN111828218 A CN 111828218A
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- common rail
- pressure common
- oil sprayer
- abnormality
- injector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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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 provides a method for diagnosing the abnormality of a high-pressure common rail oil sprayer, which comprises the steps of calculating resistance inductance parameters of the high-pressure common rail oil sprayer according to measured voltages at two ends of the high-pressure common rail oil sprayer, and rapidly judging that the high-pressure common rail oil sprayer has a fault when the resistance inductance parameters deviate from standard parameters; after the tested oil sprayer is driven, the AD acquisition channel acquires the voltage parameters of the oil sprayer, calculates the resistance inductance parameters of the oil sprayer, compares the actual values with the theoretical values, feeds back the current state of the tested equipment visually and quickly, improves the detection efficiency, and can avoid damaging the detection equipment to a certain extent.
Description
Technical Field
The invention mainly relates to the field of circuit processing of high-pressure common rail injectors, in particular to a method for diagnosing abnormity of the high-pressure common rail injectors.
Background
The oil pump test bed is a special device for detecting, adjusting and maintaining an oil injection pump of a diesel engine, and the oil injection pump test bed plays an important role in manufacturing and maintaining the oil injection pump as an oil injection pump debugging test device.
In recent years, with the increasingly wide application of diesel engines, the oil nozzle technology of an oil pump is continuously improved, and the technical requirements of oil injection pump manufacturers and maintenance industries on oil injection pump test benches are higher and higher, so that a few manufacturers of domestic test benches draw close to the world advanced technology in a dispute.
The oil pump detection platform detects the states of an oil injector and an oil injection pump, the detected equipment needs to be driven, and the judgment is carried out according to parameters such as oil inlet and return flow, response time and the like, the detection steps are relatively complex, and the method is a problem commonly existing in domestic oil pump detection equipment at present; in addition, when the damaged oil injector is detected, the parameter of the damaged oil injector is greatly different from the normal state parameter, the oil injector is detected according to the flow of the oil pump detection table, and the risk of damaging detection equipment exists, so that huge loss is caused.
Disclosure of Invention
The invention provides a method for diagnosing the abnormality of a high-pressure common rail oil sprayer, which is characterized in that a resistance inductance parameter of the high-pressure common rail oil sprayer is calculated according to measured voltages at two ends of the high-pressure common rail oil sprayer, and when the resistance inductance parameter deviates from a standard parameter, the fault of the high-pressure common rail oil sprayer can be quickly judged.
Preferably, when the high-pressure common rail injector is in a working state, the AD acquisition circuit is used for acquiring voltages at two ends of the high-pressure common rail injector, and feeding the voltage values back to a lower computer for calculation, wherein the formula is as follows:
Rds1、Rds2is the conduction impedance of the Mos tube, RLineIs line impedance, UbatIs the driving voltage of the lower computer.
Preferably, the working state of the high-pressure common rail injector is divided into a lifting stage and a holding stage, and the lifting stage and the holding stage correspond to the lifting voltage and the holding voltage respectively.
Preferably, the load of the oil injector is equivalent to the series connection of a resistor and an inductor, the current rises from 0 to Peak current in the lifting stage, the process can be equivalent to the charging process of an RL series circuit, and the tested equipment can be charged and discharged by the RL series circuit according to the charge-discharge principle of the RL series circuit by using a formula
The inductance value is calculated.
Preferably, the high-pressure common rail injector receives a control instruction of the lower computer to complete starting and stopping.
Preferably, the lower computer feeds data back to the upper computer, and whether the oil injector works abnormally is judged according to the data.
The invention has the beneficial effects that: after the tested oil sprayer is driven, the AD acquisition channel acquires the voltage parameters of the oil sprayer, calculates the resistance inductance parameters of the oil sprayer, and compares the actual values with the theoretical values, so that the current state of the tested equipment is fed back visually and quickly, the detection efficiency is improved, and the damage to the detection equipment can be avoided to a certain extent.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is an equivalent circuit diagram of the present invention when measuring the resistance of the injector;
FIG. 3 is a schematic diagram of the operating conditions of the fuel injector.
Detailed Description
As shown in FIG. 1, according to the measured voltages at the two ends of the high-pressure common rail injector, the resistance inductance parameter of the high-pressure common rail injector is calculated, and when the resistance inductance parameter deviates from the standard parameter, the high-pressure common rail injector can be rapidly judged to have a fault.
Preferably, the measured high-pressure common rail injector and the controller form a loop, when the high-pressure common rail injector is in a working state, the AD acquisition circuit is used for acquiring voltages at two ends of the high-pressure common rail injector, and the voltage value is fed back to a lower computer for calculation to obtain the resistance value of the injector, and the formula is as follows:
Rds1、Rds2is the conduction impedance of the Mos tube, RLineIs line impedance, UbatIs the driving voltage of the lower computer.
As shown in fig. 3, the operating state of the high-pressure common rail injector is divided into two states, i.e., a lift phase and a hold phase, which correspond to a lift voltage and a hold voltage, respectively, T1: in the lifting stage, Boost voltage is applied to two ends of the oil sprayer, the current of the oil sprayer is quickly increased to Peak current, and the oil sprayer is quickly opened;
T1-T2: in the keeping stage 1, battery voltage is applied to two ends of the oil sprayer, the current of the oil sprayer is maintained at the Hold1 current, and the oil sprayer fluctuates in a small range from top to bottom;
T2-T3: and in the holding stage 2, battery voltage is applied to two ends of the oil sprayer, the current of the oil sprayer is maintained at the Hold2 current, and the oil sprayer is quickly turned off after the stage is finished.
Preferably, the load of the oil injector is equivalent to the series connection of a resistor and an inductor, the current rises from 0 to Peak current in the lifting stage, the process can be equivalent to the charging process of an RL series circuit, and the tested equipment can be charged and discharged by the RL series circuit according to the charge-discharge principle of the RL series circuit by using a formula
The inductance value is calculated.
Preferably, the high-pressure common rail injector receives a control instruction of the lower computer to complete starting and stopping.
Preferably, the lower computer feeds data back to the upper computer, and whether the oil injector works abnormally is judged according to the data.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.
Claims (6)
1. A diagnostic method for abnormality of a high-pressure common rail injector, characterized by: and calculating resistance inductance parameters of the high-pressure common rail oil injector according to the voltages measured at the two ends of the high-pressure common rail oil injector, and quickly judging that the high-pressure common rail oil injector has faults when the resistance inductance parameters deviate from standard parameters.
2. The diagnostic method for abnormality of a high-pressure common rail injector according to claim 1, characterized in that: working state of high-pressure common rail oil injectorIn a state, the AD acquisition circuit is used for acquiring the voltages at two ends of the high-voltage common rail oil sprayer, and the voltage value is fed back to a lower computer for calculation, wherein the formula is as follows:
Rds1、Rds2is the conduction impedance of the Mos tube, RLineIs line impedance, UbatIs the driving voltage of the lower computer.
3. The diagnostic method for abnormality of a high-pressure common rail injector according to claim 2, characterized in that: the working state of the high-pressure common rail oil sprayer is divided into a lifting stage and a holding stage, and the lifting stage and the holding stage correspond to the lifting voltage and the holding voltage respectively.
4. The diagnostic method for abnormality of a high-pressure common rail injector according to claim 3, characterized in that: the load of the oil sprayer is equivalent to a resistor and an inductor which are connected in series, the current rises from 0 to Peak current in the lifting stage, the process can be equivalent to the charging process of an RL series circuit, and the tested equipment can be charged and discharged by the RL series circuit by utilizing the formula
The inductance value is calculated.
5. The diagnostic method for abnormality of a high-pressure common rail injector according to claim 2, characterized in that: and the high-pressure common rail oil injector receives a control instruction of the lower computer to complete starting and stopping.
6. The diagnostic method for abnormality of the high-pressure common rail injector according to claim 4, characterized in that: and the lower computer feeds the data back to the upper computer, and judges whether the oil sprayer works abnormally or not according to the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910298319.XA CN111828218A (en) | 2019-04-15 | 2019-04-15 | Diagnosis method for abnormality of high-pressure common rail injector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910298319.XA CN111828218A (en) | 2019-04-15 | 2019-04-15 | Diagnosis method for abnormality of high-pressure common rail injector |
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| CN111828218A true CN111828218A (en) | 2020-10-27 |
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| CN201910298319.XA Pending CN111828218A (en) | 2019-04-15 | 2019-04-15 | Diagnosis method for abnormality of high-pressure common rail injector |
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| CN101725426A (en) * | 2006-04-11 | 2010-06-09 | 浙江飞亚电子有限公司 | Drive control device for electromagnetic fuel pump nozzle |
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| US20140190453A1 (en) * | 2013-01-10 | 2014-07-10 | Continental Automotive Systems, Inc. | Method to Detect Partial Failure of Direct-Injection Boost Voltage |
| CN105736162A (en) * | 2014-12-08 | 2016-07-06 | 联创汽车电子有限公司 | Common rail diesel engine oil injection control system |
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2019
- 2019-04-15 CN CN201910298319.XA patent/CN111828218A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02283837A (en) * | 1989-04-21 | 1990-11-21 | Nippondenso Co Ltd | Trouble diagnosing device for fuel injection device |
| JPH10252539A (en) * | 1997-03-12 | 1998-09-22 | Toyota Motor Corp | Trouble diagnostic method and device for fuel injection device. |
| WO2005040582A2 (en) * | 2003-10-23 | 2005-05-06 | Siemens Aktiengesellschaft | Diagnostic method for an electromechanical actuator |
| CN101054930A (en) * | 2006-04-11 | 2007-10-17 | 浙江飞亚电子有限公司 | Electromagnetic fuel pump nozzle drive control method and its device |
| CN101725426A (en) * | 2006-04-11 | 2010-06-09 | 浙江飞亚电子有限公司 | Drive control device for electromagnetic fuel pump nozzle |
| CN101294534A (en) * | 2007-04-26 | 2008-10-29 | 无锡油泵油嘴研究所 | Solenoid valve diagnosis detecting method and device for electric-controlled co-rail fuel feed pump |
| CN101806875A (en) * | 2009-02-13 | 2010-08-18 | 无锡油泵油嘴研究所 | Diagnosis detecting method of piezoelectric executor and device thereof |
| CN102486131A (en) * | 2010-12-06 | 2012-06-06 | 联创汽车电子有限公司 | Driving diagnosis and protection circuit for fuel injector |
| CN102182603A (en) * | 2011-05-24 | 2011-09-14 | 浙江大学 | Fault diagnosis device and method for high-pressure common-rail fuel injection system |
| CN103912391A (en) * | 2013-01-05 | 2014-07-09 | 联创汽车电子有限公司 | Engine oil injection control system |
| US20140190453A1 (en) * | 2013-01-10 | 2014-07-10 | Continental Automotive Systems, Inc. | Method to Detect Partial Failure of Direct-Injection Boost Voltage |
| CN105736162A (en) * | 2014-12-08 | 2016-07-06 | 联创汽车电子有限公司 | Common rail diesel engine oil injection control system |
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Inventor after: Liu Zhao Inventor after: Gui Yanan Inventor after: Chu Xu Inventor after: Cao Xinglei Inventor after: Fan Jiang Inventor before: Chu Xu Inventor before: Cao Xinglei Inventor before: Fan Jiang |
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Application publication date: 20201027 |