CN108678881B - Method and device for detecting reliability of oil injector - Google Patents
Method and device for detecting reliability of oil injector Download PDFInfo
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- CN108678881B CN108678881B CN201810252631.0A CN201810252631A CN108678881B CN 108678881 B CN108678881 B CN 108678881B CN 201810252631 A CN201810252631 A CN 201810252631A CN 108678881 B CN108678881 B CN 108678881B
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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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- 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
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
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Abstract
The invention belongs to the technical field of fuel system fault detection, and particularly relates to a method and a device for detecting the reliability of a fuel injector. The method for detecting the reliability of the oil sprayer comprises the following steps: calculating the fuel injection quantity of the fuel injector according to the ECU; when the fuel injection quantity is equal to a fuel consumption calibration value, starting a liquid level sensor to detect the residual volume of the fuel; calculating to obtain the actual fuel consumption volume according to the difference value between the total fuel volume stored in the EEPROM and the residual fuel volume detected by the liquid level sensor; and comparing the actual consumption volume of the fuel with a fuel consumption calibration value to determine whether the fuel injector is blocked or abraded. By using the method and the device for detecting the reliability of the oil sprayer, whether the oil sprayer works normally or not can be effectively detected, so that related personnel can be reminded to maintain or replace the oil sprayer in time, and the dynamic property, the economical efficiency and the safety of the whole vehicle are improved.
Description
Technical Field
The invention belongs to the technical field of fuel system fault detection, and particularly relates to a method and a device for detecting the reliability of a fuel injector.
Background
Along with the gradual upgrade of the national automobile pollutant emission regulations, the electric control technology in the field of engines is developed and put into use. The control system of the electric control common rail engine receives signals of various sensors and outputs an oil injection pulse signal to an oil injector. The fuel injection quantity and the corresponding injection time are accurately controlled by means of an electromagnetic valve on the fuel injector, and atomized diesel oil is directly injected into a cylinder to burn and do work so as to provide energy. Thereby, an optimum combustion ratio, an optimum atomization and an optimum ignition time of the diesel engine are ensured, as well as good economy and minimum pollutant emissions.
In the operation process of the diesel engine, a high-pressure oil pump and an oil injector in the electric control high-pressure common rail system are all in a high-pressure working environment, and the spray holes of the oil injector are easily abraded or blocked due to the influence of factors such as the service time, the fuel quality, the filtering effect of a filter and the like. After the fuel injector is abraded or blocked, the fuel injection quantity can be increased or reduced under the same common rail fuel pressure and power-up time, the power shortage or the high fuel consumption of an engine can be easily caused, and the safety and the stability of the operation of the whole engine are greatly influenced no matter what kind of situation occurs.
Disclosure of Invention
The present invention is directed to solving at least one of the problems set forth above, and the object is achieved by the following means.
The invention provides a method for detecting the reliability of an oil sprayer, which comprises the following steps:
calculating the fuel injection quantity in the fuel tank according to the ECU, and simultaneously storing the fuel injection quantity and the total volume of the fuel in the fuel tank before fuel injection into an EEPROM;
when the fuel injection quantity calculated by the ECU is equal to a fuel consumption calibration value, starting a liquid level sensor to detect the residual volume of the fuel in the fuel tank;
calculating to obtain the actual consumption volume of the fuel according to the difference value between the total volume of the fuel in the fuel tank stored in the EEPROM and the residual volume of the fuel detected by the liquid level sensor;
and comparing the actual consumption volume of the fuel with the fuel consumption calibration value to determine whether the fuel injector is blocked or abraded.
Further, according to the method for detecting the reliability of the fuel injector, when the difference between the actual fuel consumption volume and the calibrated fuel consumption value is greater than the calibrated threshold, it is determined that the fuel consumption is large, and whether the fuel injector is abraded or not is checked.
Further, according to the method for detecting the reliability of the fuel injector, when the difference between the actual fuel consumption volume and the calibrated fuel consumption value is smaller than the calibrated threshold, it is determined that the fuel consumption is small, and whether the fuel injector is blocked is checked.
Further, according to the method for detecting reliability of the fuel injector, when the difference between the actual fuel consumption volume and the calibrated fuel consumption value is within the range of the calibrated threshold, it is determined that the fuel consumption is normal, and the fuel injector is in a reliable state.
Further, according to the method for detecting reliability of the fuel injector, after the fuel injector is started for N times, when the fuel injection amount calculated by the ECU is equal to the sum of the fuel consumption calibration value and the fuel consumption volume stored in the EEPROM, the liquid level sensor is started to detect the actual volume of the fuel in the fuel tank, wherein the fuel injection amount calculated by the ECU is equal to the sum of the fuel injection amounts of the fuel injector for N times, and the fuel consumption volume stored in the EEPROM is equal to the sum of the fuel injection amounts of the fuel injector before the N-th injection.
Further, according to the method for detecting the reliability of the fuel injector, the fuel consumption calibration value of each fuel injection is determined according to the system requirement.
The invention also provides a device for detecting the reliability of the oil injector, which is used for executing the method for detecting the reliability of the oil injector and comprises the following steps:
the ECU is used for calculating the fuel injection quantity of the fuel injector;
the liquid level sensor is arranged in the fuel tank and used for detecting the residual volume of fuel in the fuel tank;
the storage unit is used for storing the fuel injection quantity of the fuel injector and the total volume of fuel in the fuel tank before fuel injection;
and the control unit is used for receiving the fuel injection quantity calculated by the ECU and the fuel residual volume detected by the liquid level sensor, subtracting the fuel residual volume from the total volume of the fuel stored in the storage unit, calculating to obtain the actual fuel consumption volume, comparing the actual fuel consumption volume with a fuel consumption calibration value, and determining whether the fuel injector is blocked or abraded.
Further, according to the device for detecting reliability of an injector, the storage unit is an EEPROM.
By using the method and the device for detecting the reliability of the oil sprayer, whether the oil sprayer works normally or not can be effectively detected, so that related personnel can be reminded to maintain or replace the oil sprayer in time, the dynamic property, the economical efficiency and the safety of a finished automobile are improved, and meanwhile, the reliability of the liquid level sensor can be judged through mutual verification between the fuel injection quantity calculated by the ECU and the fuel consumption volume detected by the liquid level sensor.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for testing fuel injector reliability according to an embodiment;
fig. 2 is a block diagram of a device for detecting reliability of an injector according to an embodiment.
The reference numbers in the drawings are as follows:
10: ECU, 20: liquid level sensor, 30: storage unit, 40: a control unit.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 2 is a block diagram of a device for detecting reliability of an injector according to an embodiment. As shown in fig. 2, the device for detecting reliability of an injector in the present embodiment includes: ECU10, level sensor 20, storage unit 30 and control unit 40. The ECU10 is used for calculating the fuel injection quantity of the fuel injector, the liquid level sensor 20 is arranged in the fuel tank and used for detecting the actual residual volume of the fuel in the fuel tank, the storage unit 30 is used for storing the fuel injection quantity in the fuel tank and the total volume of the fuel in the fuel tank before the fuel is injected, the control unit 40 is used for receiving the fuel injection quantity calculated by the ECU10 and the residual volume of the fuel detected by the liquid level sensor 20, the difference is made between the residual volume of the fuel and the total volume of the fuel stored in the storage unit 30, the actual consumption volume of the fuel is calculated, the actual consumption volume of the fuel is compared with a fuel consumption calibration value, and whether the fuel injector is blocked or abraded.
The memory unit 30 is an EEPROM.
In the embodiment, the manufacturing cost of the vehicle is not required to be increased, the existing structure of the vehicle system is utilized, the residual volume of the fuel in the fuel tank is measured through the liquid level sensor 20 in the fuel tank, the difference is made between the residual volume and the total volume of the fuel stored in the EEPROM, and the actual consumption volume of the fuel in the fuel tank is calculated. And then, the actual volume of the fuel oil consumption is differed from the fuel oil consumption calibration value, the difference value is compared with the calibration threshold value, and the corresponding DFC (Diagnostic Fault Check code) is reported, so that the state of the fuel oil injector is determined.
Among them, an EEPROM (Electrically Erasable Programmable Read-Only Memory) is a Memory chip in which data is not lost after power failure. The fuel consumption calibration value can be determined according to the requirements of the system, and can be calibrated according to the actual condition. The calibration threshold is a range value having an upper limit value and a lower limit value.
The reliability of the oil sprayer is detected by using the device for detecting the reliability of the oil sprayer, and the method comprises the following steps:
the fuel injection amount of the injector is calculated from the ECU10, and the fuel injection amount and the total volume of fuel in the fuel tank before the fuel injection are stored in the EEPROM.
When the vehicle is running, the fuel injection amount of the injector, i.e., the volume of fuel injected by the injector, is calculated by ECU10, and this fuel injection amount is recorded in the EEPROM. Since the fuel injection amount calculated by the ECU10 is not the actual injection volume of fuel when the injector is worn or clogged, the total volume of fuel in the fuel tank is stored in the EEPROM at the time of completion of refueling for use in calculating the actual consumption volume of fuel after fuel injection.
When the fuel injection amount calculated by the ECU10 is equal to the fuel consumption calibration value, the fuel level sensor 20 is activated to detect the remaining volume of fuel in the fuel tank.
And calculating to obtain the actual consumption volume of the fuel according to the difference value between the total volume of the fuel in the fuel tank stored in the EEPROM and the residual volume of the fuel detected by the liquid level sensor.
And comparing the actual consumption volume of the fuel with a fuel consumption calibration value to determine whether the fuel injector is blocked or abraded.
When the difference value between the actual fuel consumption volume and the fuel consumption calibration value is larger than the upper limit value of the calibration threshold value, the fuel consumption is determined to be large, the corresponding DFC is reported, and whether the fuel injector is abraded or not needs to be checked at the moment.
And when the difference value between the actual fuel consumption volume and the fuel consumption calibration value is smaller than the lower limit value of the calibration threshold value, determining that the fuel consumption is small, reporting the corresponding DFC, and checking whether the fuel injector is blocked or not.
In the above two cases, if the injector is checked to be trouble-free, it indicates that the measurement of the liquid level sensor 20 is inaccurate, and at this time, it should be detected whether the liquid level sensor 20 is in failure, so as to repair or replace the liquid level sensor in time.
And when the difference value between the actual fuel consumption volume and the fuel consumption calibration value is in the calibration threshold range, determining that the fuel consumption is normal and the fuel injector is in a reliable state.
After the oil tank is filled once, all work tasks cannot be completed, oil needs to be filled for many times, and the operation of an oil sprayer needs to be stopped in the oil filling process. When the fuel injection quantity calculated by the ECU10 is equal to the sum of the fuel consumption calibration value and the fuel consumption volume stored in the EEPROM after the fuel injector is started N times, the fuel level sensor 20 is started to detect the remaining volume of fuel in the fuel tank. Wherein the fuel injection quantity calculated by the ECU10 is equal to the sum of the fuel injection quantities of the fuel injector for N times, and the fuel consumption volume stored in the EEPROM is equal to the sum of the fuel injection quantities of the fuel injector before the Nth injection, namely the sum of the fuel injection quantities of the previous (N-1) times.
Since the value recorded by the ECU10 is an accumulated value, the fuel injection amount calculated by the ECU is also an accumulated value after multiple fuel injections when the fuel injector is started multiple times.
Wherein the fuel injection quantity of the previous (N-1) times of the fuel injector is equal to the actual consumption volume of the fuel of the previous (N-1) times or is within an allowable error range. The injector is required to work in a normal state before (N-1) times, if the injector works abnormally in a certain injection process, the injector can be detected to be worn or blocked in the injection process of the injector, and the injector is required to be repaired or replaced in time so that the injector can work normally later.
The detection method can also indirectly reflect the problem of abnormal reduction (oil leakage) of the oil liquid level in the fuel tank. When this type of problem occurs, a DFC that consumes too much fuel is reported. If the parts such as the fuel injector, the liquid level sensor and the like are checked to have no problem, whether the fuel system leaks or not is considered.
By using the method and the device for detecting the reliability of the oil sprayer, whether the oil sprayer works normally or not can be effectively detected, so that related personnel can be reminded to maintain or replace the oil sprayer in time, the dynamic property, the economical efficiency and the safety of a finished automobile are improved, and meanwhile, the reliability of the liquid level sensor can be judged through mutual verification between the fuel injection quantity calculated by the ECU and the fuel consumption volume detected by the liquid level sensor. The invention utilizes the prior art of vehicles to detect, has long life cycle and wide application range, and can be suitable for various types of vehicles for a long time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. A method for detecting reliability of an oil sprayer is characterized by comprising the following steps:
calculating the fuel injection quantity of a fuel injector according to an ECU (electronic control Unit), and storing the fuel injection quantity and the total volume of fuel in a fuel tank before fuel injection into an EEPROM (electrically erasable programmable read-only memory);
when the fuel injection quantity calculated by the ECU is equal to a fuel consumption calibration value, starting a liquid level sensor to detect the residual volume of the fuel in the fuel tank;
calculating to obtain the actual consumption volume of the fuel according to the difference value between the total volume of the fuel in the fuel tank stored in the EEPROM and the residual volume of the fuel detected by the liquid level sensor;
comparing the actual fuel consumption volume with the fuel consumption calibration value to determine whether the fuel injector is blocked or abraded;
when the difference value between the actual fuel consumption volume and the fuel consumption calibration value is larger than a calibration threshold value, determining that the fuel consumption is large, and checking whether the fuel injector is abraded;
when the difference value between the actual fuel consumption volume and the fuel consumption calibration value is smaller than a calibration threshold value, determining that the fuel consumption is small, and checking whether the fuel injector is blocked or not;
and when the difference value between the actual fuel consumption volume and the fuel consumption calibration value is within the calibration threshold range, determining that the fuel consumption is normal and the fuel injector is in a reliable state.
2. The method for detecting the reliability of the fuel injector according to claim 1, characterized in that when the fuel injection quantity calculated by the ECU is equal to the sum of a fuel consumption calibration value and the fuel consumption volume stored in the EEPROM after the fuel injector is started N times, a liquid level sensor is started to detect the actual volume of the fuel in the fuel tank, wherein the fuel injection quantity calculated by the ECU is equal to the sum of the fuel injection quantities of the fuel injector N times, and the fuel consumption volume stored in the EEPROM is equal to the sum of the fuel injection quantities of the fuel injector before the N-th injection.
3. The fuel injector reliability detection method according to claim 1, characterized in that the fuel consumption calibration value for each fuel injection is determined according to system requirements.
4. A fuel injector reliability detection apparatus for performing the fuel injector reliability detection method according to claim 1, characterized by comprising:
the ECU is used for calculating the fuel injection quantity of the fuel injector;
the liquid level sensor is arranged in the fuel tank and used for detecting the residual volume of fuel in the fuel tank;
the storage unit is used for storing the fuel injection quantity of the fuel injector and the total volume of fuel in the fuel tank before fuel injection;
and the control unit is used for receiving the fuel injection quantity calculated by the ECU and the fuel residual volume detected by the liquid level sensor, subtracting the fuel residual volume from the total volume of the fuel stored in the storage unit, calculating to obtain the actual fuel consumption volume, comparing the actual fuel consumption volume with a fuel consumption calibration value, and determining whether the fuel injector is blocked or abraded.
5. The fuel injector reliability detection device according to claim 4, characterized in that the storage unit is an EEPROM.
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| CN201810252631.0A CN108678881B (en) | 2018-03-26 | 2018-03-26 | Method and device for detecting reliability of oil injector |
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| CN201810252631.0A CN108678881B (en) | 2018-03-26 | 2018-03-26 | Method and device for detecting reliability of oil injector |
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| CN108678881B true CN108678881B (en) | 2020-06-26 |
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| JP7261655B2 (en) * | 2019-05-15 | 2023-04-20 | 日立造船株式会社 | Dissolution test equipment for drugs in digestive organs |
| CN112228229B (en) * | 2020-10-13 | 2021-06-08 | 江苏里斯特通用机械制造有限公司 | Variable fuel pressure electric injection system and engine thereof |
| CN114442587B (en) * | 2021-12-21 | 2024-04-16 | 潍柴动力股份有限公司 | Engine abnormal power-off monitoring method, system and storage medium |
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| JPH0835462A (en) * | 1994-02-03 | 1996-02-06 | Christian Mathis | Fuel injection device for internal combustion engine, particularly diesel engine and monitor method thereof |
| JP2867005B2 (en) * | 1993-10-20 | 1999-03-08 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105003372B (en) * | 2015-06-15 | 2017-05-31 | 天津大学 | A kind of distributive value method for diagnosing faults based on the observation of rail pressure waveform feature parameter |
| CN105043479A (en) * | 2015-07-13 | 2015-11-11 | 贺志君 | Remote oil consumption monitoring device and method for vehicle diesel engine and vehicle |
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| JP2867005B2 (en) * | 1993-10-20 | 1999-03-08 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
| JPH0835462A (en) * | 1994-02-03 | 1996-02-06 | Christian Mathis | Fuel injection device for internal combustion engine, particularly diesel engine and monitor method thereof |
| CN103321809A (en) * | 2013-07-08 | 2013-09-25 | 潍柴动力股份有限公司 | Oil injector fault checking method and device |
| CN105464871A (en) * | 2016-02-03 | 2016-04-06 | 中国人民解放军防空兵学院 | Metering system for fuel of PT pump fuel injector and metering method of metering system |
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