CN114060195A - Method, system, storage medium and electronic equipment for reducing vibration of engine - Google Patents
Method, system, storage medium and electronic equipment for reducing vibration of engine Download PDFInfo
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- CN114060195A CN114060195A CN202010772002.8A CN202010772002A CN114060195A CN 114060195 A CN114060195 A CN 114060195A CN 202010772002 A CN202010772002 A CN 202010772002A CN 114060195 A CN114060195 A CN 114060195A
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000003860 storage Methods 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 215
- 239000007924 injection Substances 0.000 claims abstract description 215
- 239000000446 fuel Substances 0.000 claims abstract description 127
- 238000012937 correction Methods 0.000 claims abstract description 38
- 239000003921 oil Substances 0.000 claims description 119
- 239000010727 cylinder oil Substances 0.000 claims description 42
- 238000004590 computer program Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 12
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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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
- F02M65/001—Measuring fuel delivery of a fuel injector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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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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- Combustion & Propulsion (AREA)
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- 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, a system, a storage medium and an electronic device for reducing engine vibration, wherein the method comprises the following steps: controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted within a preset range of the current oil injection quantity; sequentially acquiring 0.5-order maximum torsional vibration value and 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection quantity; sequentially obtaining the difference value between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different oil injection quantities; and selecting the adjustment value combination of the oil injection quantity corresponding to the minimum value in the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each cylinder as the oil injection quantity correction value of each cylinder. According to the invention, the oil injection quantity of each cylinder is adjusted, so that the abrasion of the oil injector and the rotating speed of the engine are corrected, abnormal vibration caused by unstable rotating speed of the engine is reduced, early failure of engine parts caused by vibration is avoided, the reliability of the engine is improved, and the driving comfort is improved.
Description
Technical Field
The present invention relates to the field of transmitter technologies, and in particular, to a method, a system, a storage medium, and an electronic device for reducing engine vibration.
Background
After the engine oil sprayer runs in a long mileage, the oil injection quantity of each cylinder is different due to different abrasion degrees, the output torque of each cylinder of the engine is different, the working power of each cylinder is different during combustion, the rotating speed of the engine is greatly fluctuated during running, and the abnormal and violent vibration of the engine can be sensed. Abnormal vibration of the engine can present potential quality risks such as early wear of engine mounts, early failure of engine parts, and increased driver complaints about vehicle shudder. Torsional vibration is the main fatigue failure factor of the engine crankshaft, and crankshaft torsional vibration suppression is beneficial to improving the working reliability of the engine and improving the noise vibration of a vehicle. By adjusting the fuel injection quantity of the fuel injector of each cylinder, the torsional vibration of the crankshaft can be reduced, the rotating speed fluctuation of the engine can be reduced, the vibration of the engine can be reduced, and the reliability of the engine can be improved.
In the prior art, a knock sensor or an acceleration sensor is added on an engine to monitor whether the engine vibrates, the detected vibration intensity and frequency spectrum are compared with a preset value, the comparison result is fed back to preset oil injection logic, and the oil injection quantity of each oil injector is adjusted, so that abnormal engine vibration is reduced. This approach requires additional sensors for the engine manufacturer to detect vibration, resulting in increased cost and reduced market competitiveness.
Another method is to detect the pressure inside the cylinder to calculate the torque fluctuation inside the cylinder, and calculate the reverse torque value of the torque fluctuation as a torque correction amount, and further correct the torque fluctuation to zero, that is, eliminate the vibration. Due to the need of punching holes in the cylinder cover to install the sensors, the method also needs to add extra cost to monitor the air pressure in the cylinder, and the addition of the sensors in the cylinder has the potential risks of air leakage and failure of the sensors.
Therefore, a method for effectively reducing the vibration of the engine without adding an additional process or structure and increasing the cost is needed, the reliability of the engine is improved, and the service life of the engine is prolonged.
Disclosure of Invention
The invention provides a method for reducing the vibration of an engine, which solves the problem of abnormal vibration of the engine when the rotating speed of the engine greatly fluctuates, improves the reliability of the engine and enhances the driving comfort of a driver.
The invention provides a method for reducing vibration of an engine, which comprises the following steps:
controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted within a preset range of the current oil injection quantity;
after the oil injection amount is adjusted every time, sequentially acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different oil injection amount combinations;
calculating to obtain the difference value between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under the different fuel injection amount combinations;
and selecting an adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference values of the cylinders as a fuel injection quantity correction value of each cylinder.
In an embodiment of the present invention, it is,
the oil injection quantity of a plurality of cylinders of control engine is adjusted in the preset scope of current oil injection quantity, includes:
the method comprises the following steps that an electronic engine controller reduces the fuel injection quantity of a fuel injector of each cylinder of an engine to a first preset value of the current fuel injection quantity;
and in the first-stage adjustment, increasing the fixed percentage every time on the basis of the first preset value for the oil injection quantity of the Nth cylinder oil injector, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the Nth cylinder oil injector reaches a second preset value of the current oil injection quantity.
In an embodiment of the present invention, it is,
the adjustment of the oil injection quantity of a plurality of cylinders of control engine in the preset scope of current oil injection quantity still includes:
and performing second-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-1 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-1 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises performing the first-stage adjustment when the oil injection quantity of the N-1 cylinder oil injector is increased by the fixed percentage every time.
In an embodiment of the present invention, it is,
the adjustment of the oil injection quantity of a plurality of cylinders of control engine in the preset scope of current oil injection quantity still includes:
and a third-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-2 cylinder oil injector every time on the basis of the first preset value, and performing stage-by-stage adjustment in each work cycle until the oil injection quantity of the N-2 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the second-stage adjustment is included when the oil injection quantity of the N-2 cylinder oil injector is increased by the fixed percentage every time and is adjusted stage-by-stage.
In an embodiment of the present invention, it is,
the adjustment of the oil injection quantity of a plurality of cylinders of control engine in the preset scope of current oil injection quantity still includes:
and fourth-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-3 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-3 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises third-stage adjustment when the oil injection quantity of the N-3 cylinder oil injector is increased by the fixed percentage every time.
In an embodiment of the present invention, it is,
the preset range of the current oil injection quantity comprises 95-105% of the current oil injection quantity;
the first preset value setting comprises 95%;
the second preset value setting comprises 105%;
the fixed percentage setting comprises 0.1%;
the N value settings include 4, 3, 2, and 1.
In an embodiment of the present invention, it is,
the selecting the oil injection quantity of each cylinder corresponding to the minimum value in the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft as the oil injection quantity correction value of each cylinder comprises the following steps:
and if the minimum value of the difference values between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshafts exists in each cylinder at the same time, selecting the fuel injection quantity adjusting value with the minimum absolute value in fuel injection quantity adjustment corresponding to the minimum values as a correction value.
The present invention also provides a system for reducing engine vibration, comprising:
the fuel injection amount adjusting module: the device is used for controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted in sequence within a preset range of the current oil injection quantity;
a torsional vibration value acquisition module: the device is used for acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection amount combinations;
a torsional vibration value difference value calculation module: the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each combination of different oil injection quantities of each cylinder is obtained;
a correction amount calculation module: and the adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each cylinder is selected as the fuel injection quantity correction value of each cylinder.
The present invention also provides a storage medium having stored thereon a computer program,
the program when executed by a processor implements the steps of the method for reducing engine vibration as set forth in any one of the above.
The present invention also provides an electronic device, comprising:
a memory having a computer program stored thereon; and
a processor for executing the computer program in the memory to implement the steps of the method for reducing engine vibration of any of the above.
One or more embodiments of the present invention may have the following advantages over the prior art:
according to the invention, the fuel injection quantity of the engine fuel injector is calculated and controlled, the fuel injection quantity of each cylinder is adjusted, new parts or structures are not required to be added, and the abrasion of the fuel injector and the rotating speed of the engine are corrected, so that abnormal vibration caused by unstable rotating speed of the engine is reduced, early failure of engine parts caused by vibration is avoided, the reliability of the engine is improved, the service life of the engine is prolonged, and the driving comfort of a driver is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an engine speed correction process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating adjustment of fuel injection amount of each cylinder during correction of engine speed according to an embodiment of the present invention;
FIG. 4 is a system block diagram of an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following detailed description of the present invention with reference to the accompanying drawings is provided to fully understand and implement the technical effects of the present invention by solving the technical problems through technical means. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
First embodiment
FIG. 1 is a schematic flow chart of the present embodiment;
FIG. 2 is a schematic diagram of the engine speed correction flow of the embodiment;
fig. 3 is a schematic diagram illustrating adjustment of the fuel injection amount of each cylinder in the engine speed correction process according to the embodiment.
The embodiment provides a method for reducing vibration of an engine, which comprises the following steps:
controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted within a preset range of the current oil injection quantity;
after the oil injection amount is adjusted every time, sequentially acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different oil injection amount combinations;
calculating to obtain the difference value between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection quantity combinations;
and selecting an adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference values of the cylinders as a fuel injection quantity correction value of each cylinder.
The specific implementation mode of each step is as follows:
step 100: and controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted within a preset range of the current oil injection quantity.
In the present embodiment, the method includes:
the method comprises the following steps that an electronic engine controller reduces the fuel injection quantity of a fuel injector of each cylinder of an engine to a first preset value of the current fuel injection quantity;
adjusting the fixed percentage of the oil injection quantity of the N cylinder oil injector in each working cycle step by step on the basis of the first preset value in the first-stage adjustment until the oil injection quantity of the oil injector in the N cylinder reaches a second preset value of the current oil injection quantity
In this embodiment, the method further includes:
and performing second-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-1 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-1 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises performing the first-stage adjustment when the oil injection quantity of the N-1 cylinder oil injector is increased by the fixed percentage every time.
In this embodiment, the method further includes:
and a third-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-2 cylinder oil injector every time on the basis of the first preset value, and performing stage-by-stage adjustment in each work cycle until the oil injection quantity of the N-2 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the second-stage adjustment is included when the oil injection quantity of the N-2 cylinder oil injector is increased by the fixed percentage every time and is adjusted stage-by-stage.
In this embodiment, the method further includes:
and fourth-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-3 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-3 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises third-stage adjustment when the oil injection quantity of the N-3 cylinder oil injector is increased by the fixed percentage every time.
Wherein the fixed percentage setting comprises 0.1%, preferably 0.1%, and the N value setting comprises 4, 3, 2, and 1.
Specifically, after the engine runs for a long distance, the oil injectors of the cylinders are abraded to different degrees, so that the oil injection quantity of the cylinders is inconsistent, the output torque of the cylinders of the engine is different, the working power of the cylinders is different during combustion, the rotating speed of the engine is greatly fluctuated during running, torsional vibration is formed, and abnormal and violent vibration of the engine can be sensed. Wherein each work cycle of the engine comprises 4 processes: an intake stroke, a compression stroke, an ignition stroke, and an exhaust stroke.
An electronic control module (ECM for short) of the engine can detect and record the total running time of the engine, the running time of the engine is accumulated to be integral multiple of 1000 hours every time, and when the engine runs in an idle speed and the opening degree of an accelerator pedal is zero, the engine can perform a rotating speed correction process once so as to reduce abnormal vibration of the engine.
In the process of correcting the rotating speed of the engine, the switching of a fan, the change of the working state of an air compressor and the switching of the thermal management of the engine need to be avoided so as to ensure that the torque output of the engine is a fixed value.
In this embodiment, when the engine performs the speed correction, the fuel injection amount of a plurality of cylinders of the engine is controlled to be adjusted within a preset range of the current fuel injection amount, where the preset range of the current fuel injection amount includes 95% to 105% of the current fuel injection amount.
Further, in the embodiment, during the rotation speed correction, the engine electronic controller ECM needs to reduce the fuel injection quantity of each cylinder injector of the engine to a first preset value of the current fuel injection quantity, and the ECM adjusts the fuel injection quantity of the injector by changing the opening time of the injector, where the first preset value setting includes 95%. After the rotating speed correction is started, the fuel injection quantity of all cylinder fuel injectors of the engine is reduced to 95% of the current fuel injection quantity, and then the first-stage adjustment is carried out.
Specifically, taking a 4-cylinder engine as an example, the first-stage adjustment is to perform stepwise adjustment in each work cycle by increasing the fuel injection amount of the fourth-cylinder fuel injector by 0.1% each time on the basis of 95% until the fuel injection amount of the fourth-cylinder fuel injector reaches a second preset value of the current fuel injection amount, where the second preset value includes 105%, and is preferably 105%.
When the fuel injection quantity is adjusted, other cylinders do not participate in the adjustment of the fuel injection quantity in the fuel injection change process of the fuel injector in the fourth cylinder. For example, in a 4-cylinder 4-stroke engine, when the fuel injection quantity of the first cylinder fuel injector, the second cylinder fuel injector and the third cylinder fuel injector is kept at a fixed value, the fuel injection quantity of the fourth cylinder fuel injector is sequentially increased from 95% to 105% of the current fuel injection quantity in a gradient of increasing 0.1% fuel injection quantity per stroke to complete each work cycle, and the total fuel injection quantity is adjusted for 100 times.
And after the first-stage adjustment is finished, performing second-stage, third-stage and fourth-stage adjustment. And the second-stage adjustment is that the oil injection quantity of the third cylinder oil injector is increased by 0.1% every time on the basis of 95%, and the first-stage adjustment is carried out in each working cycle until the oil injection quantity of the third cylinder oil injector reaches 105% of the current oil injection quantity, wherein the first-stage adjustment is included when the oil injection quantity of the third cylinder oil injector is increased by 0.1% every time and is adjusted step by step. And the third-stage adjustment is that the oil injection quantity of the second cylinder oil injector is gradually adjusted in each working cycle by increasing 0.1% upwards each time on the basis of the first preset value until the oil injection quantity of the second cylinder oil injector reaches 105% of the current oil injection quantity, wherein the second-stage adjustment is included when the oil injection quantity of the second cylinder oil injector is gradually adjusted by increasing 0.1% each time. And the fourth-stage adjustment is that the oil injection quantity of the first cylinder oil injector is adjusted step by step in each work cycle by increasing 0.1% upwards each time on the basis of the first preset value until the oil injection quantity of the first cylinder oil injector reaches 105% of the current oil injection quantity, wherein the third-stage adjustment is included when the oil injection quantity of the first cylinder oil injector is adjusted step by increasing 0.1% each time.
Specifically, after the fourth cylinder completes the adjustment process from 95% to 105% of the current fuel injection amount, the second-stage adjustment is performed, the first cylinder and the second cylinder keep the fuel injection amount unchanged, and when the third cylinder increases 0.1% of the current fuel injection amount, the fourth cylinder completes the scanning process of 95% -105% again, and the adjustment of the fuel injection amount combination is completed 1 ten thousand times in total. And by analogy, the whole combination adjustment of the four cylinder oil injectors from 95% oil injection quantity to 105% oil injection quantity is completed. And the third-stage adjustment keeps the oil injection quantity of the first cylinder unchanged, and the second, third and fourth cylinders complete all combined adjustment from 95% to 105% of oil injection quantity cylinder by cylinder, so that the adjustment of the oil injection quantity combination is completed 100 ten thousand times. And the fourth stage adjustment is that the first cylinder, the second cylinder, the third cylinder and the fourth cylinder complete all combined adjustment from 95% oil injection quantity to 105% oil injection quantity one by one, and 1 hundred million times of adjustment of oil injection quantity combination is completed in total. The detailed whole combination process of the fuel injection quantity is shown in a schematic diagram of the adjustment combination of the fuel injection quantity of each cylinder in the engine rotating speed correction process of FIG. 3.
Step 200: after the oil injection amount is adjusted each time, the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different oil injection amount combinations are sequentially obtained.
For a 4-cylinder 4-stroke engine, 2 revolutions are required for one cylinder to complete one working cycle (intake, compression, ignition, exhaust), ignition once. Therefore, the single-cylinder crankshaft is ignited for 0.5 time per rotation, which corresponds to 0.5 step. Since there are 4 cylinders, 0.5 × 4 is fired 2 times per crankshaft revolution. Thus, the engine's firing order is 2, and for a single cylinder is 0.5. The torsional vibration is generated by the main machine transmitting power through the shafting, so that the torsion angles among the shaft sections are unequal, and the shaft sections swing back and forth. For torsional vibration, the crankshaft is longer, the torsional rigidity is lower, and the rotational inertia of the crankshaft shaft system is larger, so that the frequency of the torsional vibration of the crankshaft is lower, and resonance is easily generated in the working rotating speed range of the internal combustion engine. If no precaution is taken, the noise is larger and the abrasion of other parts is increased, and if the noise is larger, the crankshaft can be broken. Thus, torsional vibration is an important factor that must be considered in the design of an internal combustion engine.
Specifically, the sampling frequency of a crankshaft speed sensor on the engine is generally up to 8KHz, namely 48 ten thousand counts per minute, and the work done in a cylinder is 1.4 ten thousand counts per minute according to the maximum operation speed 7000 rpm of a 4-cylinder 4-stroke engine. The sampling frequency of the crankshaft speed sensor is far greater than the rotating speed condition of each cylinder during combustion, the engine ECM can record the rotating speed condition of the crankshaft in each working cycle through data collected by the crankshaft speed sensor, the highest rotating speed and the lowest rotating speed of the crankshaft are counted, and then spectrum analysis and torsional vibration order analysis are carried out on the data collected by the engine ECM. Therefore, the maximum torsional vibration value of 0.5 order and the minimum torsional vibration value of 0.5 order of the crankshaft corresponding to each cylinder under different fuel injection quantities can be obtained in sequence.
Step 300: and calculating to obtain the difference value between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection quantity combinations.
Specifically, based on the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection quantities, the engine ECM can obtain the difference between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection quantities. The combination of the minimum difference between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft is the stroke of each cylinder for injecting oil and uniformly combusting.
Step 400: and selecting an adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference values of the cylinders as a fuel injection quantity correction value of each cylinder.
In this embodiment, after obtaining the difference between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection amounts, the adjustment value combination of the fuel injection amount corresponding to the minimum value in the difference values of each cylinder is selected, and the change value of the fuel injection amount of each cylinder under the combination with the minimum difference value is the correction amount when the subsequent engine operates as work, that is, the fuel injection amount correction value of each cylinder.
Specifically, for the current fuel injection quantity, the combination of the minimum difference between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of a certain engine crankshaft is that the fuel injection quantity of a first cylinder is reduced by 1.0%, the fuel injection quantity of a second cylinder is reduced by 0.7%, the fuel injection quantity of a third cylinder is increased by 0.1%, and the fuel injection quantity of a fourth cylinder is increased by 0.2%, and the four values are that the fuel injection quantity of the first cylinder is-1.0%, the fuel injection quantity of the second cylinder is-0.7%, the fuel injection quantity of the third cylinder is increased by + 0.1%, and the fuel injection quantity of the fourth cylinder is increased by 0.2%, and are used as the corrected value of the fuel injection quantity of each cylinder when the subsequent engine operates.
Whether the engine runs in an external characteristic or at high idle speed, the fuel injection quantity is required to be corrected according to the value until the next 1000 hours of engine running. And if the minimum value of the difference values between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the plurality of crankshafts exists in each cylinder at the same time, selecting the fuel injection quantity with the minimum numerical value absolute value from the fuel injection quantities corresponding to the minimum values as a correction value.
In addition, under the normal state of the engine, by adjusting the oil injection combination of different oil injectors, when the 0.5 order torsional vibration value of the optimal combination is smaller than a fixed value defined by a certain engine manufacturer, the combination is effective. If the 0.5 order torsional vibration value of the optimal combination is always larger than the fixed value defined by an engine manufacturer, the rotating speed correction process is invalid, a message is required to inform a user that the abnormal vibration of the engine cannot be corrected and reduced through the fuel injection quantity, and other parts in an engine cylinder need to be checked.
Specifically, with reference to fig. 2, a method for reducing engine vibration involves four parts of the engine: a crankshaft speed sensor, an engine ECM, fuel injectors for each cylinder of the engine, and an engine crankshaft (including mechanisms such as crank rods).
In the engine speed correction process, the engine ECM adjusts the combination of different fuel injection quantities of the fuel injector, the fuel injector injects fuel into a cylinder, a crankshaft is driven to rotate through work-applying combustion, a crankshaft speed sensor inputs an acquired speed signal to the engine ECM as feedback, and the engine ECM analyzes and records the difference value between the maximum speed and the minimum speed of the engine under the fuel injection combination. And repeating the steps in a circulating mode until all the oil injection combinations are tried, comparing all the maximum and minimum rotating speed differences, finding the combination with the minimum difference, giving the correction quantity of the oil injector under the combination to each cylinder, and finishing the rotating speed correction process of the engine. And when the subsequent engine works, the oil injection in each cylinder is corrected according to the given correction amount until the next rotating speed correction process is started.
In summary, the embodiment of the present invention provides a method for reducing engine vibration, which finds an adjustment value of a fuel injection amount combination corresponding to a minimum value in a difference between a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of a crankshaft of each cylinder by calculating and controlling a fuel injection amount of an engine fuel injector, and implements adjustment of the fuel injection amount of each cylinder, without adding new parts or structures, and implements correction of wear of the fuel injector and an engine speed, thereby reducing abnormal vibration caused by unstable engine speed, avoiding early failure of engine parts caused by vibration, improving reliability of the engine, prolonging service life of the engine, and improving driving comfort of a driver.
Second embodiment
Fig. 3 is a schematic diagram of a system module framework according to the embodiment.
The present embodiment provides a system for reducing engine vibration, comprising:
the fuel injection amount adjusting module: the device is used for controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted in sequence within a preset range of the current oil injection quantity;
a torsional vibration value acquisition module: the device is used for acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection amount combinations;
a torsional vibration value difference value calculation module: the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each combination of different oil injection quantities of each cylinder is obtained;
a correction amount calculation module: and the adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each cylinder is selected as the fuel injection quantity correction value of each cylinder.
In summary, the embodiment of the present invention provides a system for reducing engine vibration, calculates and controls the fuel injection amount of an engine fuel injector, finds the adjustment value of the fuel injection amount combination corresponding to the minimum value of the difference between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft of each cylinder, and implements adjustment of the fuel injection amount of each cylinder, without adding new parts or structures, and implements correction of wear of the fuel injector and the engine speed, thereby reducing abnormal vibration caused by unstable engine speed, avoiding early failure of engine parts caused by vibration, improving reliability of the engine, prolonging service life of the engine, and improving driving comfort of a driver.
Third embodiment
The present embodiment provides a storage medium, on which a computer program is stored,
the program when executed by a processor implements the steps of the method for reducing engine vibration as set forth in any one of the above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Fourth embodiment
The embodiment provides an electronic device, including:
a memory having a computer program stored thereon; and
a processor for executing the computer program in the memory to implement the steps of the method for reducing engine vibration of any of the above.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In addition, if the rotating speed or the rail pressure is tested, the rotating speed correction process can be carried out, and the fuel injection quantity of the fuel injector of each cylinder can be calculated by judging the rail pressure drop when each cylinder works so as to carry out the rotating speed correction and adjustment, so that the abnormal vibration of the engine can be reduced.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as disclosed, and that the scope of the invention is not to be limited to the particular embodiments disclosed herein but is to be accorded the full scope of the claims.
Claims (10)
1. A method of reducing engine vibration, comprising the steps of:
controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted within a preset range of the current oil injection quantity;
after the oil injection amount is adjusted every time, sequentially acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different oil injection amount combinations;
calculating to obtain the difference value between the 0.5 order maximum torsional vibration value and the 0.5 order minimum torsional vibration value of the crankshaft corresponding to each cylinder under the different fuel injection amount combinations;
and selecting an adjustment value of the fuel injection quantity combination corresponding to the minimum value in the difference values of the cylinders as a fuel injection quantity correction value of each cylinder.
2. The method of claim 1, wherein controlling the amount of fuel injected into the plurality of cylinders of the engine to adjust within a predetermined range of a current amount of fuel injected comprises:
controlling the fuel injection quantity of each cylinder fuel injector of the engine to be adjusted to a first preset value of the current fuel injection quantity;
and in the first-stage adjustment, increasing the fixed percentage every time on the basis of the first preset value for the oil injection quantity of the Nth cylinder oil injector, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the Nth cylinder oil injector reaches a second preset value of the current oil injection quantity.
3. The method of claim 2, wherein controlling the amount of fuel injected into the plurality of cylinders of the engine to adjust within a predetermined range of a current amount of fuel injected further comprises:
and performing second-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-1 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-1 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises performing the first-stage adjustment when the oil injection quantity of the N-1 cylinder oil injector is increased by the fixed percentage every time.
4. The method of claim 3, wherein controlling the amount of fuel injected into the plurality of cylinders of the engine to adjust within a predetermined range of a current amount of fuel injected further comprises:
and a third-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-2 cylinder oil injector every time on the basis of the first preset value, and performing stage-by-stage adjustment in each work cycle until the oil injection quantity of the N-2 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the second-stage adjustment is included when the oil injection quantity of the N-2 cylinder oil injector is increased by the fixed percentage every time and is adjusted stage-by-stage.
5. The method of claim 4, wherein controlling the amount of fuel injected into the plurality of cylinders of the engine to adjust within a predetermined range of a current amount of fuel injected further comprises:
and fourth-stage adjustment, namely increasing the fixed percentage of the oil injection quantity of the N-3 cylinder oil injector every time on the basis of the first preset value, and performing step-by-step adjustment in each work cycle until the oil injection quantity of the N-3 cylinder oil injector reaches a second preset value of the current oil injection quantity, wherein the step-by-step adjustment comprises third-stage adjustment when the oil injection quantity of the N-3 cylinder oil injector is increased by the fixed percentage every time.
6. The method according to any one of claims 1 to 5,
the preset range of the current oil injection quantity comprises 95-105% of the current oil injection quantity;
the first preset value setting comprises 95%;
the second preset value setting comprises 105%;
the fixed percentage setting comprises 0.1%;
the N value settings include 4, 3, 2, and 1.
7. The method of claim 1, wherein selecting the adjustment value of the fuel injection amount combination corresponding to the minimum value of the difference values of the cylinders as the fuel injection amount correction value of each cylinder comprises:
and if the minimum value of the difference values between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshafts exists in each cylinder at the same time, selecting the combination of the fuel injection quantity adjusting values with the minimum absolute value in the fuel injection quantity adjustment corresponding to the minimum values as the correction value.
8. A system for reducing engine vibration, comprising:
the fuel injection amount adjusting module: the device is used for controlling the oil injection quantity of a plurality of cylinders of the engine to be adjusted in sequence within a preset range of the current oil injection quantity;
a torsional vibration value acquisition module: the device is used for acquiring a 0.5-order maximum torsional vibration value and a 0.5-order minimum torsional vibration value of the crankshaft corresponding to each cylinder under different fuel injection amount combinations;
a torsional vibration value difference value calculation module: the difference value between the 0.5-order maximum torsional vibration value and the 0.5-order minimum torsional vibration value of the crankshaft of each combination of different oil injection quantities of each cylinder is obtained;
a correction amount calculation module: and the adjusting value of the oil injection quantity combination corresponding to the minimum value in the difference values of the cylinders is selected to be used as the oil injection quantity correction value of each cylinder.
9. A storage medium having a computer program stored thereon, wherein,
the program when executed by a processor performs the steps of the method of reducing engine vibration of any one of claims 1 to 7.
10. An electronic device, comprising:
a memory having a computer program stored thereon; and
a processor for executing the computer program in the memory to carry out the steps of the method of reducing engine vibration according to any one of claims 1 to 7.
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