CN114352454A - Ignition coil charging duration self-learning method and engine system - Google Patents
Ignition coil charging duration self-learning method and engine system Download PDFInfo
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- CN114352454A CN114352454A CN202210098985.0A CN202210098985A CN114352454A CN 114352454 A CN114352454 A CN 114352454A CN 202210098985 A CN202210098985 A CN 202210098985A CN 114352454 A CN114352454 A CN 114352454A
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Abstract
The invention belongs to the technical field of engines and discloses a self-learning method of ignition coil charging duration and an engine system. The ignition coil charging duration self-learning method includes the steps that MAP1 of storage battery voltage, engine coolant temperature and ignition coil charging duration is obtained through early-stage tests, when the ignition coil needs to be charged, basic charging duration of the ignition coil is obtained from MAP1 according to the current storage battery voltage and the current engine coolant temperature, and then the basic charging duration is corrected according to correction parameters, so that theoretical charging duration is obtained; and then acquiring the current actual charging time of the ignition coil, and further correcting the theoretical charging time according to the actual charging time to obtain the target charging time. The charging time length of the ignition coil can be automatically corrected, and the obtained target charging time length is high in accuracy, so that the energy stored by the ignition coil can meet the requirement of normal ignition, the performance of an engine is improved, and the running stability of a vehicle is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an ignition coil charging duration self-learning method and an engine system.
Background
The ignition system is a core system for providing ignition energy in an engine system, and mainly comprises an ignition coil, a spark plug and the like. In practical application, the ignition coil needs to be charged before the engine is ignited, and after the charging time reaches the preset initial charging time, the electric energy can be released through the spark plug, so that the ignition starting of the engine is completed. However, as the service time of the ignition coil and the spark plug is gradually increased, the ignition coil is gradually aged, the initial charging duration of the ignition coil preset in the controller cannot normally meet the ignition requirement, and the aging of the type can cause problems of accidental fire of the engine or insufficient ignition energy to cause insufficient combustion and the like, thereby affecting the performance and the emission result of the engine, and in severe cases, the risk of burning out the aftertreatment catalyst exists.
The existing ignition coil charging duration self-learning method only corrects the charging duration of an ignition coil through the voltage of a storage battery, so that the corrected ignition coil charging duration is low in accuracy.
Disclosure of Invention
The invention aims to provide an ignition coil charging duration self-learning method and an engine system, and aims to solve the problem that the accuracy of the ignition coil charging duration obtained by correcting the ignition coil charging duration self-learning method in the prior art is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ignition coil charging duration self-learning method comprises the following steps:
MAP1 that obtains battery voltage, engine coolant temperature, and ignition coil charge duration;
obtaining a basic charging period of an ignition coil from the MAP1 according to a current battery voltage and a current engine coolant temperature;
correcting the basic charging time length according to the correction parameters to obtain a theoretical charging time length;
and acquiring the actual charging time, and correcting the theoretical charging time according to the actual charging time to obtain the target charging time.
Preferably, the correction parameter is determined at least by an engine speed, an accelerator opening degree, and a charging current of an ignition coil.
Preferably, the step of correcting the basic charging duration according to the correction parameter to obtain the theoretical charging duration includes:
acquiring a first correction coefficient according to the engine speed and the accelerator opening;
acquiring a second correction coefficient according to the charging current of the ignition coil;
and correcting the basic charging time length according to the first correction coefficient and the second correction coefficient to obtain the theoretical charging time length.
Preferably, the first correction coefficient is a first weight coefficient obtained from the engine speed and the accelerator opening degree, the second correction coefficient is a second weight coefficient obtained from a charging current of the ignition coil, and the theoretical charging period is the basic charging period × the first weight coefficient × the second weight coefficient.
Preferably, the specific step of correcting the theoretical charging duration according to the actual charging duration to obtain the target charging duration includes:
judging whether the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder are both larger than a first set value;
and if the absolute value of the difference between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than the first set value, correcting the theoretical charging time length according to the minimum value of the absolute values of the differences between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder to obtain the target charging time length.
Preferably, the target charging period is an accumulated value of the theoretical charging period plus a minimum value among absolute values of differences between the actual charging period of each cylinder and the theoretical charging period of each cylinder.
Preferably, the first set value is 0.1 second.
Preferably, the ignition coil charging duration self-learning method further includes:
judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than a second set value or not;
if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than the second set value, a first self-learning fault is reported;
judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value or not;
if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value, a second self-learning fault is reported;
the second set value and the third set value are positive numbers, and the second set value is larger than the third set value.
Preferably, the second set value and the third set value are both greater than the first set value.
An engine system is used for implementing the ignition coil charging time length self-learning method.
The invention has the beneficial effects that:
the invention provides an ignition coil charging duration self-learning method and an engine system. The ignition coil charging duration self-learning method comprises the steps that MAP1 of storage battery voltage, engine coolant temperature and ignition coil charging duration is obtained through early-stage tests, when the ignition coil needs to be charged, basic charging duration of the ignition coil is obtained from MAP1 according to the current storage battery voltage and the current engine coolant temperature, and then the basic charging duration is corrected according to correction parameters to obtain theoretical charging duration; and then acquiring the current actual charging time of the ignition coil, and further correcting the theoretical charging time according to the actual charging time to obtain the target charging time. Therefore, when the ignition coil is charged next time, the ignition coil is charged according to the target charging duration. Compared with the prior art that the charging time of the ignition coil is corrected only through the voltage of the storage battery, the charging time of the ignition coil can be automatically corrected according to the ignition coil charging time self-learning method, and the obtained target charging time is high in accuracy, so that the energy stored by the ignition coil can meet the requirement of normal ignition, the performance of an engine is improved, and the running stability of a vehicle is improved.
Drawings
FIG. 1 is a first flowchart of a method for self-learning a charging duration of an ignition coil according to an embodiment of the present invention;
fig. 2 is a flowchart ii of a method for self-learning a charging duration of an ignition coil according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The invention provides an ignition coil charging duration self-learning method, which comprises the following steps as shown in figures 1 and 2.
S100, obtaining MAP1 of the voltage of a storage battery, the temperature of engine coolant and the charging time of an ignition coil.
Specifically, MAP1 of the battery voltage, the engine coolant temperature, and the ignition coil charging period is obtained from a large number of previous experiments.
S200, obtaining a basic charging time length of the ignition coil from the MAP1 according to the current storage battery voltage and the current engine coolant temperature. That is, the ignition coil charging period corresponding to the current battery voltage and the current engine coolant temperature is obtained from the MAP1, which is the basic charging period.
And S300, correcting the basic charging time according to the correction parameters to obtain the theoretical charging time.
Wherein the correction parameters are determined at least by the engine speed, the accelerator opening and the charging current of the ignition coil. It will be appreciated that the factor determining the correction parameter may be increased or decreased depending on the actual operating conditions.
As shown in fig. 2, the specific steps of determining the correction parameter from the engine speed, the accelerator opening, and the charging current of the ignition coil include:
s301, acquiring a first correction coefficient according to the engine speed and the accelerator opening.
The first correction coefficient is a first weight coefficient obtained according to the engine speed and the accelerator opening. Specifically, MAP2 of the engine speed, the accelerator opening and the ignition coil charging duration is obtained through a large number of previous tests, the corresponding ignition coil charging duration is obtained in MAP2 according to the current engine speed and the current accelerator opening, and the first weight coefficient is calculated according to the corresponding ignition coil charging duration obtained in MAP2 according to the current engine speed and the current accelerator opening.
S302, acquiring a second correction coefficient according to the charging current of the ignition coil.
Wherein the second correction coefficient is a second weight coefficient obtained according to the charging current of the ignition coil. Specifically, MAP3 of the charging current and the ignition coil charging duration is obtained through a large number of previous experiments, the corresponding ignition coil charging duration is obtained in MAP3 according to the current charging current, and the second weight coefficient is calculated according to the corresponding ignition coil charging duration obtained in MAP2 according to the current charging current.
In this embodiment, S301 and S302 are executed in sequence. In other embodiments, S302 may be performed first, and then S301 may be performed.
S303, correcting the basic charging time length according to the first correction coefficient and the second correction coefficient to obtain the theoretical charging time length.
Specifically, the theoretical charging period is the base charging period × the first weight coefficient × the second weight coefficient. Thus, the theoretical charging time length is obtained through correction calculation of the basic charging time length, the first correction coefficient and the second correction coefficient.
Compared with the prior art, the ignition coil charging duration self-learning method only corrects the ignition coil charging duration through the storage battery voltage, the engine coolant temperature and MAP1 of the ignition coil charging duration, and then corrects the basic charging duration according to the engine speed, the accelerator opening and the charging current of the ignition coil to obtain the theoretical charging duration. Therefore, the accuracy of the theoretical charging time is effectively improved.
In the prior art, if the engine speed, and/or the accelerator opening and/or the charging current of an ignition coil are/is changed, the basic charging time needs to be calibrated again, so that the cost for correcting the theoretical charging time is increased, and the correction period is long.
The ignition coil charging duration self-learning method includes the steps that MAP2 of engine speed, accelerator opening and ignition coil charging duration and MAP3 of charging current and ignition coil charging duration are obtained through a large number of early-stage tests, when the engine speed and/or the accelerator opening are/is changed, corresponding ignition coil charging duration is obtained in MAP2 only according to the current engine speed and the current accelerator opening, and corresponding ignition coil charging duration is obtained in MAP2 according to the current engine speed and the current accelerator opening to calculate a first weight coefficient, so that theoretical charging duration is obtained; in particular, when the charging current changes, the corresponding ignition coil charging duration is obtained in the MAP3 according to the current charging current, and the second weight coefficient is calculated according to the corresponding ignition coil charging duration obtained in the MAP3 according to the current charging current, so as to obtain the theoretical charging duration. Therefore, the cost increase of the theoretical charging time length is effectively reduced, and the correction period is shortened.
S400, obtaining the actual charging time, and correcting the theoretical charging time according to the actual charging time to obtain the target charging time.
The specific steps of correcting the theoretical charging duration according to the actual charging duration to obtain the target charging duration include:
and judging whether the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder are both larger than a first set value.
And if the absolute value of the difference between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than the first set value, correcting the theoretical charging time length according to the minimum value of the absolute values of the differences between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder to obtain the target charging time length.
Specifically, the target charging time length is an accumulated value of a theoretical charging time length plus a minimum value of absolute values of differences between actual charging time lengths of the cylinders and theoretical charging time lengths of the cylinders, so that the target charging time length is obtained, and when the ignition coil is charged next time, the ignition coil is charged with the target charging time length.
It is understood that S100 to S400 are repeatedly performed. The charging duration self-learning of the ignition coil is a repeated learning process, and if the absolute value of the difference value between the actual charging duration of each cylinder and the theoretical charging duration of each cylinder in the process of the charging duration self-learning of the ignition coil each time is larger than a first set value, the minimum value of the absolute value of the difference value between the actual charging duration of each cylinder and the theoretical charging duration of each cylinder in the process of the charging duration self-learning of the ignition coil each time is accumulated in the theoretical charging duration obtained in the process of the charging duration self-learning of the ignition coil last time.
It can be understood that, if at least one of the absolute values of the difference between the actual charging duration of each cylinder and the theoretical charging duration of each cylinder in the process of self-learning the charging duration of the ignition coil each time is less than or equal to the first set value, the target charging duration does not need to be corrected in the process of self-learning the charging duration of the ignition coil. Under the condition, the theoretical charging time length obtained in the self-learning process of the charging time length of the ignition coil is the target charging time length.
In this embodiment, the first set value is 0.1 second. Wherein the first set value is an empirical value. It is understood that the first set point may also be adjusted according to the actual operating conditions.
Therefore, the theoretical charging time length is corrected through the actual charging time length, and the accuracy of the target charging time length is further improved.
Due to the fact that the charging coils of different production batches are different, under the same voltage, the charging time lengths of different ignition coils are integrally different, if the actual charging time and the theoretical charging time length are greatly different, the risk of false alarm faults exists, and the robustness of an engine product is reduced.
Therefore, the ignition coil charging duration self-learning method further comprises the following steps:
and judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than a second set value or not.
And if the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than a second set value, reporting a first self-learning fault.
And judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value.
And if the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is less than or equal to a third set value, reporting a second self-learning fault.
Wherein the second set value is greater than the third set value. It can be understood that, each time the ignition coil self-learning is carried out, the accumulated value of the minimum value in the absolute values of the difference values between the actual charging duration of each cylinder and the theoretical charging duration of each cylinder is detected once, and if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging duration of each cylinder and the theoretical charging duration of each cylinder is between the second set value and the third set value, the ignition coil charging duration self-learning process is normal; if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than a second set value, a first self-learning fault is reported; and if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value, reporting a second self-learning fault.
If the first self-learning fault is reported, the target charging time length obtained in the self-learning process of the ignition coil charging time length is too long; and if the second self-learning fault is reported, the target charging time length obtained in the self-learning process of the charging time length of the ignition coil is too short. Too long or too short a charge duration for the ignition coil is indicative of an ignition coil failure and/or an engine failure, requiring repair or replacement of the ignition coil failure and/or the engine. Wherein the second set value and the third set value are both positive numbers.
And the second set value and the third set value are empirical values. Can be adjusted according to actual working conditions.
And the second set value and the third set value are both larger than the first set value. Therefore, the first self-learning fault or the second self-learning fault can be effectively detected according to the second set value and the third set value, and the ignition coil and/or the engine can be maintained or replaced conveniently.
According to the ignition coil charging duration self-learning method, the engine system can automatically correct the charging duration of the ignition coil, and the obtained target charging duration is high in accuracy, so that the energy stored by the ignition coil can meet the requirement of normal ignition, the engine performance is improved, and the running stability of a vehicle is improved; in addition, the engine system can diagnose whether the ignition coil or the engine is in fault or not by applying the ignition coil charging duration self-learning method.
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. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. 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. An ignition coil charging duration self-learning method is characterized by comprising the following steps:
MAP1 that obtains battery voltage, engine coolant temperature, and ignition coil charge duration;
obtaining a basic charging period of an ignition coil from the MAP1 according to a current battery voltage and a current engine coolant temperature;
correcting the basic charging time length according to the correction parameters to obtain a theoretical charging time length;
and acquiring the actual charging time, and correcting the theoretical charging time according to the actual charging time to obtain the target charging time.
2. The ignition coil charging duration self-learning method according to claim 1, wherein the correction parameter is determined by at least an engine speed, an accelerator opening degree, and a charging current of an ignition coil.
3. The ignition coil charging duration self-learning method according to claim 2, wherein the specific steps of determining the correction parameters from the engine speed, the accelerator opening and the charging current of the ignition coil include:
acquiring a first correction coefficient according to the engine speed and the accelerator opening;
acquiring a second correction coefficient according to the charging current of the ignition coil;
and correcting the basic charging time length according to the first correction coefficient and the second correction coefficient to obtain the theoretical charging time length.
4. The ignition coil charging period self-learning method according to claim 3, wherein the first correction coefficient is a first weight coefficient obtained from the engine speed and the accelerator opening degree, the second correction coefficient is a second weight coefficient obtained from a charging current of the ignition coil, and the theoretical charging period is the base charging period x the first weight coefficient x the second weight coefficient.
5. The ignition coil charging duration self-learning method according to claim 1, wherein the specific step of correcting the theoretical charging duration according to the actual charging duration to obtain the target charging duration comprises:
judging whether the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder are both larger than a first set value;
and if the absolute value of the difference between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than the first set value, correcting the theoretical charging time length according to the minimum value of the absolute values of the differences between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder to obtain the target charging time length.
6. The ignition coil charging period self-learning method according to claim 5, wherein the target charging period is an accumulated value of the theoretical charging period plus a minimum value of absolute values of differences between the actual charging period of each cylinder and the theoretical charging period of each cylinder.
7. The ignition coil charging duration self-learning method according to claim 5, wherein the first set value is 0.1 seconds.
8. The ignition coil charging duration self-learning method according to claim 6, further comprising:
judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than a second set value or not;
if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is larger than the second set value, a first self-learning fault is reported;
judging whether the accumulated value of the minimum value in the absolute values of the difference values of the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value or not;
if the accumulated value of the minimum value in the absolute values of the difference values between the actual charging time length of each cylinder and the theoretical charging time length of each cylinder is smaller than a third set value, a second self-learning fault is reported;
the second set value and the third set value are positive numbers, and the second set value is greater than the third set value.
9. The ignition coil charging duration self-learning method according to claim 8, wherein both the second set value and the third set value are greater than the first set value.
10. An engine system characterized by being used for implementing the ignition coil charging duration self-learning method of any one of claims 1 to 9.
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| CN114992030A (en) * | 2022-07-08 | 2022-09-02 | 广西玉柴机器股份有限公司 | Ignition energy control method for natural gas engine |
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