CN114962113A - Method for reducing idle speed jitter of engine, engine and vehicle - Google Patents
Method for reducing idle speed jitter of engine, engine and vehicle Download PDFInfo
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- CN114962113A CN114962113A CN202210752739.2A CN202210752739A CN114962113A CN 114962113 A CN114962113 A CN 114962113A CN 202210752739 A CN202210752739 A CN 202210752739A CN 114962113 A CN114962113 A CN 114962113A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001133 acceleration Effects 0.000 claims abstract description 94
- 230000008569 process Effects 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000000725 suspension Substances 0.000 description 6
- 238000004880 explosion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
-
- 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
Abstract
The invention belongs to the technical field of engine control, and discloses a method for reducing idle speed jitter of an engine, the engine and a vehicle. The method for reducing the idle speed jitter of the engine comprises the steps of detecting the average angular acceleration of a crankshaft and the total average angular acceleration of a plurality of cylinders when each cylinder is in a power stroke, subtracting the average angular acceleration from the total average angular acceleration to obtain a difference value, correcting each cylinder according to the difference value, calculating the adjustment quantity of an ignition angle, controlling and adjusting the ignition angle, reducing the difference value between the average angular acceleration and the total average angular acceleration of each cylinder, and repeating the process repeatedly. According to the method for reducing the idle speed jitter of the engine, the average angular acceleration of each cylinder is calculated through iterative updating, the ignition angle is further adjusted, the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced, the output torque is adjusted, and the problem of the idle speed jitter of the vehicle is finally solved.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a method for reducing idle speed jitter of an engine, the engine and a vehicle.
Background
When the engine of the vehicle is idling, the engine load is low, the engine speed is low, at this time, the combustion speed of the mixture gas in the engine is slow, and the torque generated by combustion has large fluctuation, so that the vehicle is easy to feel shake in the vehicle when the vehicle is idling. The engine is mounted with a suspension to the vehicle body, which absorbs the vibration of the engine, but the suspension cannot effectively absorb the low-frequency vibration, which is transmitted to the vehicle body, and the vibration frequency is usually below 15 Hz. When the driver steps on the accelerator pedal, the engine is out of the idling working condition, the rotating speed of the engine is increased, meanwhile, the load of the engine is increased, the combustion is improved, the vibration frequency is increased, and the vibration level in the vehicle is reduced. The prior art is limited by the characteristics of suspension hardware, and the idle speed jitter problem needs to be improved, so that great hardware improvement cost is required, such as modes of optimizing an engine structure, optimizing suspension, optimizing a vehicle body and the like.
When the engine of the vehicle is in an idle working condition, the engine does not need to output torque outwards, and the engine needs to maintain running and stably runs in an idle speed range, wherein the idle speed is usually set at 700 r/min. When the engine works, the torque needs to be controlled to a smaller value firstly, and the torque can just overcome the friction torque. At this time, the engine control system controls the air inflow of the throttle valve to be small, and simultaneously injects a proper amount of gasoline. And the load can change and fluctuate due to the work of an external generator, an air conditioner and the like during idling.
Therefore, a method for reducing engine idle speed jitter is needed to dynamically adjust the firing angle, and thus the torque output by the engine, to maintain a specific rotational speed.
Disclosure of Invention
One object of the present invention is to provide a method for reducing idle speed jitter of an engine, which adjusts an ignition angle according to a difference value between an average angular acceleration of a crankshaft and a total average angular acceleration of each cylinder during a power stroke, so as to reduce the difference value between the average angular acceleration of the crankshaft and the total average angular acceleration of each cylinder during the power stroke.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of reducing engine idle judder for reducing said engine judder when the engine is in an idle condition, comprising the steps of:
s1: detecting the average angular acceleration of a crankshaft of each cylinder in the engine during a power stroke and the total average angular acceleration of a plurality of cylinders;
s2: subtracting the average angular acceleration of each cylinder from the total average angular acceleration to obtain a difference value between the average angular acceleration of each cylinder and the total average angular acceleration;
s3: obtaining a gain coefficient of the average angular acceleration of each cylinder according to the difference value, and calculating an adjustment amount of an ignition angle of each cylinder according to the gain coefficient;
s4: controlling and adjusting the ignition angle of each cylinder according to the adjustment amount of the ignition angle of each cylinder, so that the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced;
preferably, in step S1, a rotation speed sensor is provided on the crankshaft, an angular acceleration of the crankshaft during the power stroke of each cylinder is detected by the rotation speed sensor, and the average angular acceleration and the total average angular acceleration of each cylinder are calculated from the angular acceleration of each cylinder.
Preferably, said rotational speed sensor detects said angular acceleration of said crankshaft during a time interval from top dead center to bottom dead center for each of said cylinders on said power stroke.
Preferably, step S3 is specifically:
multiplying a difference value between the average angular acceleration and the total average angular acceleration of each cylinder by the gain coefficient corresponding to the difference value to obtain an adjustment amount of the ignition angle of each cylinder
Preferably, the gain factor includes a proportional part gain factor and an integral part gain factor, and the gain factor is obtained by multiplying the proportional part gain factor and the integral part gain factor
Where t represents time.
Preferably, the corresponding values of the gain factor are different under different idle conditions.
Preferably, when the engine is in the idle condition, the steps S1-S4 are repeated circularly to enable the difference value to be decreased infinitely.
Preferably, the number of cylinders of the engine is three or more.
The second purpose of the invention is to provide an engine and a method for reducing idle speed jitter of the engine by adopting any one of the schemes.
A third object of the present invention is to provide a vehicle including the engine according to the above aspect.
The invention has the beneficial effects that:
the invention provides a method for reducing idle speed jitter of an engine, which comprises the steps of detecting the average angular acceleration of a crankshaft and the total average angular acceleration of a plurality of cylinders when each cylinder is in a power stroke under an idle working condition, and subtracting the average angular acceleration from the total average angular acceleration to obtain a difference value, then correcting the average angular acceleration of each cylinder according to the difference value of the average angular acceleration and the total average angular acceleration of each cylinder, calculating the adjustment quantity of an ignition angle of each cylinder, controlling and adjusting the ignition angle, further reducing the difference value between the average angular acceleration and the total average angular acceleration of each cylinder, enabling the average angular acceleration of each cylinder to be infinitely close to the total average angular acceleration, and repeating the process. According to the method for reducing the idle speed jitter of the engine, the average angular acceleration of each cylinder is calculated through iterative updating, the ignition angle is further adjusted, the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced, the output torque is further adjusted, the difference of the output torque of each cylinder in the power stroke is reduced as much as possible, and the problem of the idle speed jitter of the vehicle is finally solved.
Drawings
FIG. 1 is a flow chart of a method of reducing engine idle judder in accordance with an embodiment of the present invention;
FIG. 2 is a schematic table of reference of the proportional partial gain coefficients according to an embodiment of the present invention;
fig. 3 is a schematic reference table of gain coefficients of the integral part according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The idling working condition is a common working condition of the engine, at the moment, the engine does not work outwards, the rotating speed and the low load of the engine are small, and the idling vibration problem caused by the conditions of combustion torque fluctuation and the like is easy to occur. Generally, due to the characteristics of engine working conditions and the like, the combustion is deteriorated, so that a certain idle vibration problem exists. Particularly, low-frequency idle vibration cannot be effectively filtered due to the suspension of the engine, and the vibration is obvious at the time of idling due to the low rotating speed of the engine, so that vehicle vibration can be sensed on a vehicle seat at the time of idling. At the moment, the upgrading effects of related hardware such as suspension, vibration isolation and the like are little.
The idle condition is common in the following scenarios: when the user starts the vehicle and does not step on the accelerator pedal for running, the engine still works after the user steps on the brake for stopping, and the like. Reducing vehicle idle speed jitter to improve user experience is a problem that needs to be addressed at present.
The embodiment of the invention provides a method for reducing idle speed jitter of an engine, which is suitable for any multi-cylinder engine, such as engines with three cylinders, four cylinders, six cylinders, eight cylinders … … and the like, wherein the number of cylinders of the engine is not limited. The following description will be made by taking a four-cylinder engine as an example.
As shown in FIG. 1, the method for reducing engine idle speed jitter comprises the following steps: step S0, detecting whether the engine is in an idling working condition, if so, executing step S1; if not, continuing the detection. When the engine is in the idle condition, step S1 is performed, and the average angular acceleration of the crankshaft during the power stroke of each cylinder and the total average angular acceleration of the crankshaft during the power stroke of each of the four cylinders in the engine are detected. Step S2: and (3) making a difference between the average angular acceleration of each cylinder and the total average angular acceleration to obtain a difference value between the average angular acceleration of each cylinder and the total average angular acceleration. Step S3: and obtaining a gain coefficient corresponding to the average angular acceleration of each cylinder according to the difference value, and calculating the adjustment quantity of the ignition angle of each cylinder according to the gain coefficient. Step S4: the adjustment quantity of the ignition angle is transmitted to an ignition coil, the ignition angle is controlled and adjusted, and then the average angular acceleration of each cylinder is adjusted accordingly, so that the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced, the difference of output torque of each cylinder of the engine in a power stroke is reduced, and the idle speed jitter of the vehicle is reduced. Step S5: returning to the step S0, repeating the steps S0-S4 due to the intervention of different loads such as air conditioner opening and catalyst heating under the idle working condition, and controlling the ignition angle in real time, so that the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced infinitely. It can be understood that the average angular acceleration of each cylinder in this embodiment is the average angular acceleration of the cylinder when the piston drives the crankshaft to rotate through the connecting rod during the power stroke, and the total average angular acceleration is/4 of the sum of the average angular accelerations of the crankshaft rotation of the four cylinders during the power stroke respectively.
In the present embodiment, the ignition angle correction principle: when the average angular acceleration is larger than the total average angular acceleration, the ignition angle is reduced, so that the explosion pressure of combustion of the cylinder in the power stroke is reduced, and the average angular acceleration is reduced; when the average angular acceleration is smaller than the total average angular acceleration, the ignition angle is increased, so that the explosion pressure of combustion in the cylinder during the power stroke is increased, and the average angular acceleration is increased.
According to the method for reducing the idle speed jitter of the engine, the average angular acceleration of each cylinder is calculated through iterative updating, the ignition angle is further adjusted, the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced, the output torque is further adjusted, the difference of the output torque of each cylinder in the power stroke is reduced as much as possible, and the problem of the idle speed jitter of the vehicle is finally solved.
Specifically, the determination conditions for determining that the engine is in the idle condition in step S0 are: the accelerator pedal is stepped on, and the rotational speed of the engine is within a preset range. When the accelerator pedal is stepped on, an electric signal can be generated and fed back to a control system of the engine, and the control system judges whether the engine is in an idling working condition or not by combining a rotating speed value of the engine.
More specifically, the preset range of the engine speed is set between 600 and 800 rpm.
Specifically, in step S1, a rotation speed sensor is provided on the crankshaft, and an angular acceleration of the crankshaft during a power stroke of each cylinder can be detected by the rotation speed sensor, and an average angular acceleration and a total average angular acceleration of each cylinder during a power stroke can be calculated by the angular acceleration. The crankshaft is provided with the rotating speed sensor, so that the angular acceleration can be detected more conveniently, and the structure is simple.
Specifically, the angular acceleration is measured by a rotational speed sensor of the crankshaft, and is calculated based on a time interval during which the corresponding cylinder is in a power stroke. The time interval is the time interval from the top dead center to the bottom dead center when the cylinder corresponds to the power stroke within the 720-degree rotating angle formed by two circles of the crankshaft. For a four-cylinder engine, the time interval takes into account that the number of cylinders of the engine is 4, which is equal to 720 °/4 in that time interval, i.e. the time interval corresponding to a crank angle of 180 °. Therefore, a certain cylinder angular acceleration is an angle of a crank angle/time interval.
Specifically, step S3 specifically includes: and multiplying the difference value between the average angular acceleration and the total average angular acceleration of each cylinder by a gain coefficient corresponding to the average angular acceleration of the cylinder to obtain the adjustment quantity of the ignition angle of the cylinder, and outputting the adjustment quantity of the ignition angle to an ignition coil of the engine to adjust the ignition angle so as to adjust the output torque. It is understood that the fluctuation of the output torque causes the idle hunting, and therefore, the reduction of the output torque can reduce the idle hunting to a limited extent.
More specifically, as shown in fig. 2-3, the gain factors include a proportional part gain factor and an integral part gain factor,
t represents time, when the correction is actually started, the gain coefficient of the proportional part in the initial correction period is larger so as to quickly adjust the ignition angle, the gain coefficient of the integral part is gradually increased along with the accumulated learning of the time as the time goes by, and the gain coefficient of the proportional part is gradually reduced.
It is understood that, referring to fig. 2-3, the proportional gain coefficient and the integral gain coefficient are illustratively selected to be affected by the temperature of the coolant, and the proportional gain coefficient and the integral gain coefficient may be selected accordingly according to fig. 2 and 3. Of course, when the vehicle actually runs, the gain coefficients of the proportional part and the integral part are influenced by various external factors, for example, after the air conditioner is started, the gain coefficients of the proportional part and the integral part are simultaneously influenced by the temperature of the cooling liquid and the starting action of the air conditioner, so that the gain coefficients of the proportional part and the integral part are selected according to different idle conditions to carry out targeted optimization on the engine. Other idle conditions are not enumerated here.
The embodiment also provides an engine, and the method for reducing the idle speed jitter of the engine can effectively reduce the jitter of the engine under the idle speed working condition.
This embodiment still provides a vehicle, and this vehicle can reduce vehicle idle speed shake through setting up above-mentioned engine, promotes user's use impression, and need not to increase extra hardware cost, promotes the product competitiveness of this vehicle.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of reducing engine idle judder in an engine when said engine is operating at idle comprising the steps of:
s1: detecting the average angular acceleration of a crankshaft of each cylinder in the engine during a power stroke and the total average angular acceleration of a plurality of cylinders;
s2: subtracting the average angular acceleration of each cylinder from the total average angular acceleration to obtain a difference value between the average angular acceleration of each cylinder and the total average angular acceleration;
s3: obtaining a gain coefficient of the average angular acceleration of each cylinder according to the difference value, and calculating an adjustment amount of an ignition angle of each cylinder according to the gain coefficient;
s4: and controlling and adjusting the ignition angle of each cylinder according to the adjustment amount of the ignition angle of each cylinder, so that the difference value between the average angular acceleration of each cylinder and the total average angular acceleration is reduced.
2. The method for reducing engine idle judder of claim 1 wherein step S1 is implemented by providing a rotation speed sensor on said crankshaft, detecting an angular acceleration of said crankshaft of each of said cylinders during said power stroke via said rotation speed sensor, and calculating said average angular acceleration and said total average angular acceleration of each of said cylinders from said angular acceleration of each of said cylinders.
3. A method of reducing engine idle judder as set forth in claim 2 wherein said rotational speed sensor senses said angular acceleration of said crankshaft during a time interval from top dead center to bottom dead center for each of said cylinders during said power stroke.
4. The method for reducing engine idle judder of claim 1, wherein step S3 is embodied as:
and multiplying the difference value of the average angular acceleration and the total average angular acceleration of each cylinder by the gain coefficient corresponding to the difference value to obtain the adjustment amount of the ignition angle of each cylinder.
5. The method of reducing engine idle judder of claim 4 wherein said gain factor comprises a proportional part gain factor and an integral part gain factor, said gain factor comprising a gain factor of a proportional part and a gain factor of an integral part
Where t represents time.
6. A method of reducing engine idle judder as claimed in claim 4, characterized in that the corresponding values of the gain factor are different under different idle conditions.
7. The method for reducing engine idle judder of claims 1-6, wherein steps S1-S4 are repeated cyclically such that said difference value is infinitely reduced when said engine is in said idle condition.
8. The method of reducing engine idle judder of any of claims 1-6 wherein the number of cylinders in the engine is equal to or greater than three.
9. An engine characterised by a method of reducing engine idle judder as claimed in any one of claims 1 to 8.
10. A vehicle characterized by comprising the engine of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210752739.2A CN114962113A (en) | 2022-06-28 | 2022-06-28 | Method for reducing idle speed jitter of engine, engine and vehicle |
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| CN202210752739.2A CN114962113A (en) | 2022-06-28 | 2022-06-28 | Method for reducing idle speed jitter of engine, engine and vehicle |
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| CN114412682A (en) * | 2022-01-04 | 2022-04-29 | 武汉菱电汽车电控系统股份有限公司 | Cylinder-separated ignition control method and system for enhancing idle speed stability |
-
2022
- 2022-06-28 CN CN202210752739.2A patent/CN114962113A/en active Pending
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| US5701865A (en) * | 1996-04-26 | 1997-12-30 | Chrysler Corporation | Method of adjusting idle spark for an individual cylinder of an internal combustion engine |
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