CN110985224A - Method and system for judging working state of oil sprayer at initial starting stage of diesel engine - Google Patents
Method and system for judging working state of oil sprayer at initial starting stage of diesel engine Download PDFInfo
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- CN110985224A CN110985224A CN201911291555.5A CN201911291555A CN110985224A CN 110985224 A CN110985224 A CN 110985224A CN 201911291555 A CN201911291555 A CN 201911291555A CN 110985224 A CN110985224 A CN 110985224A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method and a system for judging the working state of a fuel injector at the initial starting stage of a diesel engine, which relate to the field of engines, wherein the method comprises the following steps: acquiring an engine running state; judging whether the running state of the engine is a starting stage or not; if yes, acquiring the actual rail pressure of each cylinder at the initial injection stage and the lowest rail pressure in the injection process; calculating the real-time injection rail pressure deviation of each cylinder by using a formula; judging whether the real-time injection rail pressure deviation of each cylinder is less than or equal to a preset rail pressure deviation threshold value or not; if yes, reporting the error once, and accumulating by a counter for accumulating the error reporting times of each cylinder; judging whether the accumulated times is greater than or equal to a preset time threshold value or not; if so, outputting a fault signal of the oil injector of the corresponding cylinder, and clearing the corresponding counter. Therefore, the invention can judge the working state of the fuel injector at the initial stage of starting the engine and effectively lock whether the starting failure of the diesel engine is related to the fuel injector or not.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a system for judging the working state of an oil sprayer at the initial starting stage of a diesel engine.
Background
In the initial starting stage of the diesel engine, especially in the initial cold starting stage, the problem that the fuel injector cannot normally inject fuel due to the problems of too low battery voltage, clamping stagnation of the fuel injector or consistency of the fuel injector can be caused, and even the starting cannot be performed in severe cases.
At present, control logic of an ECU of a diesel engine cannot identify starting failure caused by abnormal working state of an oil injector. As shown in fig. 4, in the initial stage of starting the diesel engine, when a certain cylinder starts to ignite, the diesel oil in the high-pressure common rail pipe 1 is immediately injected into the combustion chamber through the injector 3, and at this time, the inlet oil of the high-pressure common rail pipe 1 is kept unchanged because the opening degree of the oil quantity metering unit valve and the engine speed are basically kept unchanged, so that the diesel oil pressure of the high-pressure common rail pipe 1 is rapidly reduced. In fact, the volume of the high-pressure common rail pipe 1 should theoretically reduce the oil supply pressure fluctuation of the high-pressure oil pump and the pressure fluctuation caused by the oil injection process of each oil injector, but in the initial starting period, when the rotating speed of the engine is low and the rail pressure is low, the pressure accumulation effect is not obvious.
When the initial normal injection is started, the rail pressure is changed, the rail pressure drop amplitude is 58bar when 1 cylinder ignites, the drop amplitude of 3 cylinders is 70bar, the drop amplitude of 4 cylinders is 72bar, and the drop amplitude of 2 cylinders is 61 bar.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: the method and the system for judging the working state of the oil injector at the initial starting stage of the diesel engine can judge the working state of the oil injector at the initial starting stage of the engine and effectively lock whether the starting failure of the diesel engine is related to the oil injector.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for judging the working state of an oil injector at the initial starting stage of a diesel engine comprises the following steps:
acquiring an engine running state;
judging whether the running state of the engine is a starting stage or not;
if yes, acquiring the actual rail pressure of each cylinder at the initial injection stage and the lowest rail pressure in the injection process;
the real-time injection rail pressure deviation of each cylinder is obtained by using a formula, wherein the formula is as follows: real-time injection rail pressure deviation is equal to the actual rail pressure at the initial injection stage, namely the lowest rail pressure in the injection process;
judging whether the real-time injection rail pressure deviation of each cylinder is less than or equal to a preset rail pressure deviation threshold value or not;
if yes, reporting the error once, and accumulating by a counter for accumulating the error reporting times of each cylinder;
judging whether the accumulated times is greater than or equal to a preset time threshold value or not;
if so, outputting a fault signal of the oil injector of the corresponding cylinder, and clearing the corresponding counter.
Preferably, before the step of judging whether the real-time injection rail pressure difference of each cylinder is less than or equal to the preset rail pressure deviation threshold value, the method further comprises the following steps:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table calibrated in advance according to the rotating speed and the fuel injection quantity of the engine to obtain a calibrated rail pressure deviation;
and taking the calibrated rail pressure deviation as the rail pressure deviation threshold value.
Preferably, after the step of checking the rail pressure deviation, the method further comprises the following steps:
searching a pre-calibrated correction curve according to the actual rail pressure of each cylinder at the initial injection stage, and searching a correction coefficient;
the rail pressure deviation threshold is the product of the calibrated rail pressure deviation and the correction coefficient.
The system for judging the working state of the fuel injector at the initial starting stage of the diesel engine comprises an electric control unit and further comprises: the state detection unit is used for judging whether the engine runs to a starting stage or not; the rail pressure detection unit is used for acquiring the actual rail pressure of each cylinder at the initial injection stage and the lowest rail pressure in the injection process, and obtaining the real-time injection rail pressure deviation of each cylinder according to the actual rail pressure of the initial injection stage and the lowest rail pressure in the injection process; the fault diagnosis detection unit compares the real-time injection rail pressure deviation of each cylinder with a preset rail pressure deviation threshold value, and sends a corresponding cylinder error reporting signal once when the real-time injection rail pressure deviation is less than or equal to the preset rail pressure deviation threshold value; the counting unit is used for accumulating the error reporting times of each cylinder; and the electric control unit judges whether the error reporting times accumulated by the counting unit are greater than or equal to a preset error reporting time threshold value or not, and outputs an abnormal signal of the corresponding cylinder oil sprayer if the error reporting times accumulated by the counting unit are greater than or equal to the preset error reporting times threshold value.
Preferably, the rail pressure detection unit comprises a rail pressure sensor arranged on the high-pressure common rail pipe.
Preferably, the counting unit comprises four counters, and the four counters respectively count error reporting times for the four cylinders.
The fuel injection quantity calibration device is characterized by further comprising a presetting unit electrically connected with the electronic control unit, wherein the presetting unit presets a calibration rail pressure deviation according to a map table calibrated by the engine rotating speed and the fuel injection quantity, and the calibration rail pressure deviation is used as a rail pressure deviation threshold value.
Preferably, the presetting unit presets a correction coefficient, then the electronic control unit searches the correction coefficient according to the actual rail pressure at the initial stage of injection of each cylinder, and the product of the correction coefficient and the calibrated rail pressure deviation is used as a rail pressure deviation threshold.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the method and the system for judging the working state of the oil injector at the initial starting stage of the diesel engine, the real-time injection rail pressure deviation of each cylinder is obtained by detecting the actual rail pressure at the initial injection stage of each cylinder and the lowest rail pressure in the injection process, the real-time injection rail pressure deviation is compared with the preset rail pressure deviation threshold, when the real-time injection rail pressure deviation is smaller than or equal to the rail pressure deviation threshold, the condition that the cylinder reports errors for 1 time is met, meanwhile, the cylinder is used for accumulating a counter for accumulating the error reporting times, when the accumulated error reporting times of the counter are larger than or equal to the preset time threshold, the state of the oil injector of the cylinder is abnormal, the error reporting is sent out, and. Therefore, the invention can judge the working state of the fuel injector at the initial stage of starting the engine and effectively lock whether the starting failure of the diesel engine is related to the fuel injector or not.
Drawings
FIG. 1 is a flow chart of a method of determining an operating condition of a fuel injector during an initial start of a diesel engine according to the present invention;
FIG. 2 is a logic relationship diagram of the method of determining the operating condition of the fuel injector at the initial start of the diesel engine according to the present invention;
FIG. 3 is a functional block diagram of a fan control system for a vehicle regeneration mode of the present invention;
FIG. 4 is a schematic diagram of the high pressure common rail of the present invention;
in the figure: 1-high pressure common rail pipe, 2-rail pressure sensor, 3-oil injector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, a method for judging the operating state of an injector at the initial start of a diesel engine includes the following steps:
step S1, obtaining the running state of the engine;
step S2, judging whether the engine running state is a starting stage;
step S3, if yes, acquiring the actual rail pressure of each cylinder in the initial injection stage and the lowest rail pressure in the injection process;
step S4, calculating the real-time injection rail pressure deviation of each cylinder by using a formula, wherein the formula is as follows: real-time injection rail pressure deviation is equal to the actual rail pressure at the initial injection stage, namely the lowest rail pressure in the injection process;
step S5, judging whether the real-time injection rail pressure deviation of each cylinder is less than or equal to a preset rail pressure deviation threshold value;
step S6, if yes, reporting error once, and accumulating by a counter for accumulating error reporting times of each cylinder;
step S7, judging whether the accumulated times is larger than or equal to a preset time threshold;
and step S8, if yes, outputting a fault signal of the fuel injector of the corresponding cylinder, and clearing the corresponding counter.
After the method is adopted, in the initial starting stage of the diesel engine, the real-time rail pressure deviation in the ignition process of a certain cylinder is obtained by detecting the actual rail pressure in the initial injection stage and the lowest rail pressure in the injection process of each cylinder and comparing the real-time rail pressure deviation with the rail pressure deviation threshold value, so that the working state of the oil sprayer in the initial starting stage of the diesel engine is judged, and whether the starting failure of the diesel engine is related to the oil sprayer can be effectively locked. The method of the invention has the advantages of no increase of the original cost, easy operation and low cost.
In this embodiment: before step S5, the method further includes the following steps:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table calibrated in advance according to the rotating speed and the fuel injection quantity of the engine to obtain a calibrated rail pressure deviation;
and taking the calibrated rail pressure deviation as a rail pressure deviation threshold value.
The rail pressure deviation threshold is set by detecting the rotating speed and the fuel injection quantity of the engine, so that the detection of the state of each cylinder fuel injector at the initial starting stage is combined with the real-time working condition, and the detection is more accurate and reliable.
In this embodiment: after the step of checking the deviation of the calibrated rail pressure, the method further comprises the following steps:
searching a pre-calibrated correction curve according to the actual rail pressure of each cylinder at the initial injection stage, and searching a correction coefficient;
the rail pressure deviation threshold is the product of the calibrated rail pressure deviation and the correction factor.
And acquiring a correction coefficient through the actual rail pressure of each cylinder in the initial injection stage, and correcting the deviation of the calibrated rail pressure so as to obtain a rail pressure deviation threshold value which is consistent with the actual working condition, so that the detection of the state of each cylinder oil injector in the initial starting stage is more accurate and reliable.
Example two:
as shown in fig. 3, a system for determining the operating state of a fuel injector at the initial starting stage of a diesel engine includes an electronic control unit, and further includes a state detection unit, a rail pressure detection unit, a fault diagnosis unit and a counting unit, which are electrically connected to the electronic control unit, respectively, wherein the state detection unit is used for determining whether an engine is operated to a starting stage; the rail pressure detection unit is used for acquiring the actual rail pressure of each cylinder at the injection initial stage and the lowest rail pressure in the injection process, and obtaining the real-time injection rail pressure deviation of each cylinder according to the actual rail pressure of each cylinder at the injection initial stage and the lowest rail pressure in the injection process; the fault diagnosis detection unit compares the real-time injection rail pressure deviation of each cylinder with a preset rail pressure deviation threshold value, and sends a corresponding cylinder error reporting signal once when the real-time injection rail pressure deviation is less than or equal to the preset rail pressure deviation threshold value; the counting unit is used for accumulating the error reporting times of each cylinder; the electric control unit judges whether the error reporting times accumulated by the counting unit are larger than or equal to a preset error reporting time threshold value or not, and if the error reporting times are larger than or equal to the preset error reporting times threshold value, an abnormal signal of the corresponding cylinder oil sprayer is output. The counting unit comprises four counters, and the four counters respectively count error reporting times for the four cylinders.
As shown in fig. 4, the rail pressure detecting unit includes a rail pressure sensor 2 provided on the high-pressure common rail pipe.
According to the system for judging the working state of the oil sprayer at the initial starting stage of the diesel engine, when the state detection unit detects that the diesel engine is in the starting stage, the electronic control unit controls the rail pressure detection unit to acquire the actual rail pressure at the initial injection stage of each cylinder and the lowest rail pressure in the injection process, the rail pressure deviation of each cylinder is obtained after the difference between the actual rail pressure and the lowest rail pressure, and specifically, the rail pressure sensor acquires the rail pressure of each cylinder. And after the real-time injection rail pressure deviation is transmitted to the electric control unit, the electric control unit starts a fault diagnosis unit to compare the real-time injection rail pressure deviation with a preset rail pressure deviation threshold value. When the real-time injection rail pressure deviation is smaller than or equal to the rail pressure deviation threshold value, the error reporting condition for 1 time is met, and the electronic control unit controls the counter of the corresponding cylinder of the counting unit to accumulate the error reporting times. Meanwhile, the electronic control unit judges whether the accumulated error reporting times of the counter are larger than or equal to a preset time threshold value, if so, the abnormal state of the cylinder oil injector is indicated, and the cylinder counter is cleared. Therefore, the system can accurately lock the working state of each fuel injector at the initial starting stage of the diesel engine, and can quickly lock whether the fuel injector is related to the fuel injector or not when the starting is abnormal.
As shown in fig. 3, the system further includes a presetting unit electrically connected to the electronic control unit, where the presetting unit presets a calibrated rail pressure deviation according to a map table calibrated by the engine speed and the fuel injection quantity, and the calibrated rail pressure deviation is used as a rail pressure deviation threshold.
The preset unit sets the calibration rail pressure deviation related to the engine rotating speed and the fuel injection quantity as a rail pressure deviation threshold value, so that the detection reliability of the system is improved, and the current real-time injection rail pressure deviation of each cylinder is related to the engine operation condition.
In order to further improve the reliability of the system, the preset unit presets a correction coefficient, the electronic control unit searches the correction coefficient according to the actual rail pressure of each cylinder in the early injection stage, and the product of the correction coefficient and the calibrated rail pressure deviation is used as a rail pressure deviation threshold value.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent improvements in the method and system for determining the operating state of the injector at the initial start of the diesel engine, which are within the spirit and principle of the present invention, are intended to be included in the scope of the present invention.
Claims (8)
1. A method for judging the working state of an oil injector at the initial starting stage of a diesel engine is characterized by comprising the following steps of:
acquiring an engine running state;
judging whether the running state of the engine is a starting stage or not;
if yes, acquiring the actual rail pressure of each cylinder at the initial injection stage and the lowest rail pressure in the injection process;
the real-time injection rail pressure deviation of each cylinder is obtained by using a formula, wherein the formula is as follows: real-time injection rail pressure deviation is equal to the actual rail pressure at the initial injection stage, namely the lowest rail pressure in the injection process;
judging whether the real-time injection rail pressure deviation of each cylinder is less than or equal to a preset rail pressure deviation threshold value or not;
if yes, reporting the error once, and accumulating by a counter for accumulating the error reporting times of each cylinder;
judging whether the accumulated times is greater than or equal to a preset time threshold value or not;
if so, outputting a fault signal of the oil injector of the corresponding cylinder, and clearing the corresponding counter.
2. The method for judging the working state of the fuel injector at the initial starting stage of the diesel engine according to claim 1, characterized by further comprising the following steps before the step of judging whether the real-time injection rail pressure difference of each cylinder is less than or equal to the preset rail pressure deviation threshold value:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table calibrated in advance according to the rotating speed and the fuel injection quantity of the engine to obtain a calibrated rail pressure deviation;
and taking the calibrated rail pressure deviation as the rail pressure deviation threshold value.
3. The method for judging the operating state of an injector at the initial startup period of a diesel engine according to claim 2, characterized by further comprising, after the step of checking the deviation of the nominal rail pressure, the steps of:
searching a pre-calibrated correction curve according to the actual rail pressure of each cylinder at the initial injection stage, and searching a correction coefficient;
the rail pressure deviation threshold is the product of the calibrated rail pressure deviation and the correction coefficient.
4. The system for judging the working state of the fuel injector at the initial starting stage of the diesel engine comprises an electric control unit and is characterized by further comprising:
the state detection unit is used for judging whether the engine runs to a starting stage or not;
the rail pressure detection unit is used for acquiring the actual rail pressure of each cylinder at the initial injection stage and the lowest rail pressure in the injection process, and obtaining the real-time injection rail pressure deviation of each cylinder according to the actual rail pressure of the initial injection stage and the lowest rail pressure in the injection process;
the fault diagnosis detection unit compares the real-time injection rail pressure deviation of each cylinder with a preset rail pressure deviation threshold value, and sends a corresponding cylinder error reporting signal once when the real-time injection rail pressure deviation is less than or equal to the preset rail pressure deviation threshold value;
the counting unit is used for accumulating the error reporting times of each cylinder;
and the electric control unit judges whether the error reporting times accumulated by the counting unit are greater than or equal to a preset error reporting time threshold value or not, and outputs an abnormal signal of the corresponding cylinder oil sprayer if the error reporting times accumulated by the counting unit are greater than or equal to the preset error reporting times threshold value.
5. The system for judging the operating state of the fuel injector at the initial startup period of the diesel engine according to claim 4, wherein the rail pressure detecting unit includes a rail pressure sensor provided on the high-pressure common rail pipe.
6. The system for judging the operating state of the fuel injector at the initial startup period of the diesel engine according to claim 4, wherein the counting unit comprises four counters, and the four counters respectively count the number of error reports for four cylinders.
7. The system for judging the working state of the fuel injector at the initial starting stage of the diesel engine according to claim 4, further comprising a presetting unit electrically connected with the electronic control unit, wherein the presetting unit presets a calibrated rail pressure deviation according to a map table of the engine speed and the fuel injection quantity, and the calibrated rail pressure deviation is used as a rail pressure deviation threshold value.
8. The system for judging the operating state of the fuel injector at the initial stage of starting of the diesel engine according to claim 7, wherein the presetting unit presets a correction coefficient, the electronic control unit searches the correction coefficient according to the actual rail pressure at the initial stage of injection of each cylinder, and the product of the correction coefficient and the calibrated rail pressure deviation is used as a rail pressure deviation threshold.
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| CN201911291555.5A CN110985224B (en) | 2019-12-16 | 2019-12-16 | Method and system for judging working state of oil sprayer at initial starting stage of diesel engine |
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| CN201911291555.5A CN110985224B (en) | 2019-12-16 | 2019-12-16 | Method and system for judging working state of oil sprayer at initial starting stage of diesel engine |
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Cited By (5)
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| CN112284739A (en) * | 2020-10-15 | 2021-01-29 | 上海柴油机股份有限公司 | Zero-rotation-speed oil sprayer testing method for engine cold test |
| CN112776004A (en) * | 2020-12-22 | 2021-05-11 | 深圳市越疆科技有限公司 | Motor encoder detection method and device for mechanical arm, mechanical arm and memory |
| CN114658542A (en) * | 2022-03-24 | 2022-06-24 | 无锡威孚高科技集团股份有限公司 | Non-road engine fault detection method based on oil quantity consistency of oil injector |
| CN115387903A (en) * | 2022-05-20 | 2022-11-25 | 潍柴动力股份有限公司 | Method and device for detecting fault of diesel engine, power device and medium |
| CN115450779A (en) * | 2022-10-28 | 2022-12-09 | 上海新动力汽车科技股份有限公司 | Control method for automatically compensating large rail pressure fluctuation of electronic control common rail engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112776004A (en) * | 2020-12-22 | 2021-05-11 | 深圳市越疆科技有限公司 | Motor encoder detection method and device for mechanical arm, mechanical arm and memory |
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| CN115387903B (en) * | 2022-05-20 | 2024-04-19 | 潍柴动力股份有限公司 | Fault detection method and device, power device and medium for diesel engine |
| CN115450779A (en) * | 2022-10-28 | 2022-12-09 | 上海新动力汽车科技股份有限公司 | Control method for automatically compensating large rail pressure fluctuation of electronic control common rail engine |
| CN115450779B (en) * | 2022-10-28 | 2024-01-30 | 上海新动力汽车科技股份有限公司 | Control method for large automatic compensation of rail pressure fluctuation of electric control common rail engine |
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| CN110985224B (en) | 2022-08-23 |
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