CN111878281B - Spark plug aging monitoring method and system and storage medium - Google Patents
Spark plug aging monitoring method and system and storage medium Download PDFInfo
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- CN111878281B CN111878281B CN202010641142.1A CN202010641142A CN111878281B CN 111878281 B CN111878281 B CN 111878281B CN 202010641142 A CN202010641142 A CN 202010641142A CN 111878281 B CN111878281 B CN 111878281B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
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Abstract
The invention discloses a spark plug aging monitoring method, a system and a storage medium, which belong to the technical field of vehicle engine monitoring. The method for monitoring the aging of the spark plug can detect the spark plug on line in real time so as to replace the aged spark plug in time and ensure the normal work of an engine.
Description
Technical Field
The invention relates to the technical field of vehicle engine monitoring, in particular to a spark plug aging monitoring method, a spark plug aging monitoring system and a storage medium.
Background
The engine is used for providing power for the vehicle to drive the vehicle to move. The natural gas engine generates a driving force by burning a mixed gas of natural gas and air. Further, the natural gas engine requires ignition of the mixture in the gas cylinder by a spark plug. The spark plug supplies ignition energy through a high-voltage coil, thereby forming a high-energy spark between the center electrode and the ground electrode, and igniting the mixture in the cylinder. The degree of aging of the spark plug directly affects the combustion state of the engine.
In the prior art, the most common way to monitor the aging state of the spark plug is to determine whether the spark plug is aged or not according to the running time of the engine and the driving mileage of the vehicle during vehicle maintenance, and to determine whether the spark plug needs to be replaced or not. Because the operating conditions of each vehicle are different, the operating habits of drivers are also greatly different, so that the accuracy for judging the aging degree of the spark plug is low, the spark plug is aged, but the operating time and the driving mileage do not reach preset values, so that the spark plug is not replaced in time, and the normal performance of the engine is influenced.
Disclosure of Invention
The invention aims to provide a spark plug aging monitoring method, a spark plug aging monitoring system and a storage medium, which can detect a spark plug on line in real time so as to replace the aged spark plug in time and ensure the normal work of an engine.
As the conception, the technical scheme adopted by the invention is as follows:
a method of monitoring spark plug degradation comprising the steps of:
s1, determining that the engine is in a preset detection working condition;
s2, opening Lamda closed-loop control to provide air for a target cylinder where a spark plug to be tested is located in the engine;
s3, igniting the target cylinder through the spark plug to be tested;
s4, recording the actual charging time of an ignition coil connected with the spark plug to be tested when the instantaneous rotating speed change value of the engine after the target cylinder is ignited is larger than a preset rotating speed change value;
s5, determining an aging coefficient of the spark plug to be tested, wherein the aging coefficient is the ratio of the actual charging time to a standard charging time, and the standard charging time is the charging time of the ignition coil, which is used for enabling the instantaneous rotating speed change value of the engine to be larger than the preset rotating speed change value when the ignition coil is connected with the unaged spark plug;
s6, acquiring the current running mileage of the vehicle;
and S7, if the aging coefficient of the spark plug to be tested is larger than a preset aging coefficient and the current running mileage of the vehicle is smaller than a preset mileage, determining that the monitoring result of the spark plug to be tested is in an aging state.
Optionally, the preset detection condition includes: the engine has no fault code, the target cylinder is not in an ignition working state, the vehicle is in a neutral state, and the engine speed is greater than a preset speed.
Optionally, after step S2, the method for monitoring aging of a spark plug further includes:
s21, when the ignition coil connected with the spark plug to be tested is chargedThe length is adjusted to the initial charging time t0。
Optionally, in step S3, the spark plug to be tested is controlled to discharge at a preset ignition time to ignite the target cylinder.
Optionally, the instantaneous speed change value is a difference between an instantaneous speed of the engine when the target cylinder is ignited and an instantaneous speed of the engine when a preceding cylinder is ignited, and the preceding cylinder is a gas cylinder whose ignition sequence is prior to the target cylinder.
Optionally, step S4 includes:
s41, judging whether the instantaneous rotating speed change value of the engine is smaller than the preset rotating speed change value or not when the target cylinder is ignited, if so, executing a step S42, and if not, executing a step S45;
s42, judging whether the charging time of the ignition coil connected with the spark plug to be tested is smaller than the upper limit of the charging time, if so, executing a step S43, otherwise, executing a step S45;
s43, increasing the charging time of an ignition coil connected with the spark plug to be tested by a target time t, and controlling the spark plug to be tested to discharge at the next preset ignition time of the target cylinder so as to ignite the target cylinder again;
s44, judging whether the rotating speed of the engine is smaller than the lower limit of the rotating speed, if so, executing a step S45, and if not, executing a step S41;
s45, closing the Lamda closed-loop control, and recording the actual charging time t of the ignition coil connected with the spark plug to be testedsWherein, ts＝t0+ nt, where n represents the number of cycles of steps S41-S44.
A spark plug degradation monitoring system capable of executing the spark plug degradation monitoring method described above, comprising:
the determining module is used for determining that an engine of the vehicle is in a preset detection working condition;
the starting module is used for starting Lamda closed-loop control to provide air for a target cylinder where a spark plug to be tested is located in the engine;
the control module is used for igniting the target cylinder through the spark plug to be tested and recording the actual charging time of the ignition coil connected with the spark plug to be tested when the instantaneous rotating speed change value of the engine is greater than the preset rotating speed change value after the target cylinder is ignited;
the first determining module is used for determining an aging coefficient of the spark plug to be tested, wherein the aging coefficient is the ratio of the actual charging time to a standard charging time, and the standard charging time is the charging time of the ignition coil, which is used for enabling the instantaneous rotating speed change value of the engine to be greater than the preset rotating speed change value when the ignition coil is connected with the unaged spark plug;
the acquisition module is used for acquiring the current running mileage of the vehicle;
and the second determination module is used for determining that the monitoring result of the spark plug to be tested is in an aging state if the aging coefficient of the spark plug to be tested is larger than a preset aging coefficient and the current running mileage of the vehicle is smaller than a preset mileage.
Optionally, the ignition device further comprises an adjusting module, wherein the adjusting module is used for adjusting the charging time of the ignition coil connected with the spark plug to be tested to be initial charging time t0。
Optionally, the first determining module includes:
a fifth judging unit, configured to judge whether an instantaneous rotation speed variation value of the engine is smaller than the preset rotation speed variation value when the target cylinder is ignited;
a sixth judging unit, configured to judge whether a charging duration of an ignition coil connected to the spark plug to be tested is less than an upper limit of the charging duration;
a control unit for increasing the charging time of the ignition coil connected with the spark plug to be tested by a target time t, controlling the spark plug to be tested to discharge at the next preset ignition moment of the target cylinder so as to ignite the target cylinder again, closing the Lamda closed-loop control, and recording the actual charging time t of the ignition coil connected with the spark plug to be testedsWherein, ts＝t0+ nt, where n represents the number of cycles of steps S41-S44;
and the seventh judging unit is used for judging whether the rotating speed of the engine is less than the lower limit of the rotating speed.
A storage medium having stored thereon a computer program which, when executed, implements the spark plug degradation monitoring method described above.
The beneficial effects of the invention at least comprise:
according to the spark plug aging monitoring method, under the condition that an engine is in a preset detection working condition, firstly, the Lamda closed-loop control is started, a target cylinder is ignited, then, when the instantaneous rotating speed change value of the engine is larger than the preset rotating speed change value when the target cylinder is ignited, the actual charging time length of an ignition coil of a spark plug to be detected is connected, and the aging coefficient of the spark plug to be detected is obtained according to the actual charging time length. And if the aging coefficient of the spark plug to be tested is larger than the preset aging coefficient and the current running mileage of the vehicle is smaller than the preset mileage, determining that the monitoring result of the spark plug to be tested is in an aging state. The method can detect the spark plug on line in real time so as to replace the aged spark plug in time, ensure the normal work of the engine, and ensure that the accuracy of the monitoring result can be higher by a monitoring mode of combining the aging coefficient of the spark plug to be detected and the current running mileage of the vehicle.
In addition, the monitoring working condition of the spark plug aging monitoring method is the period of engine oil cut, and the use of drivers and passengers is not influenced. The method can monitor the aging state of the spark plug on line safely and reliably without disassembling on the basis of not changing the hardware technical conditions of the prior engine. The method has the advantages of simple steps, convenience in operation, realization of the principle based on the algorithm, no need of adding extra hardware equipment, low cost and suitability for popularization.
Drawings
FIG. 1 is a flow chart of a method for monitoring aging of a spark plug according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of step S4 according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a spark plug degradation monitoring system according to a second embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. 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 but not all of the elements associated with the present invention are shown in the drawings.
Example one
The embodiment provides a spark plug aging monitoring method, which can monitor the aging of a spark plug in an engine at any time and has higher accuracy.
As shown in FIG. 1, the method for monitoring the aging of the spark plug comprises the following steps:
and S1, determining that the engine of the vehicle is in a preset detection working condition.
Wherein the step is a preparation before monitoring. The preset detection working condition can be the working conditions that the engine has no fault, the engine cylinder is not in an ignition state and the like. Through setting up the engine in predetermineeing the detection operating mode, can reduce the influence of other factors (such as the operational aspect of engine) to the monitoring result, can improve the accuracy of monitoring result. Optionally, the ending process in this embodiment means that the spark plug to be tested is not monitored. When the engine is not in the preset detection working condition, if the spark plug to be detected is continuously monitored, the accuracy of the monitoring result may be low, so that the implementation of the spark plug aging monitoring method needs to be stopped. The engine can be controlled to change working conditions to enable the engine to be in the preset detection working condition, and then the spark plug to be detected is monitored.
And S2, opening the Lamda closed-loop control to provide air to a target cylinder in which a spark plug to be tested is positioned in the engine.
When the engine is in a non-working state, the Lamda closed-loop control function is closed by default, and ignition control needs to be carried out on the spark plug to be tested in order to monitor the aging state of the spark plug, so that the Lamda closed-loop control function needs to be opened temporarily. Alternatively, the Lamda closed-loop control function is also referred to as an oxygen closed-loop control function.
It should be noted that the engine may have a plurality of gas cylinders, each of which is provided with a spark plug, and when monitoring the spark plugs, the spark plugs in the gas cylinders need to be monitored respectively to determine whether aged spark plugs exist in the plurality of spark plugs. When a spark plug in one of the cylinders is monitored, the one cylinder is referred to as a target cylinder.
And S3, igniting the target cylinder through the spark plug to be tested.
When the target cylinder has air therein that is sufficient for combustion, the spark plug under test may be controlled to strike a spark to ignite the fuel and air in the target cylinder to ignite the target cylinder.
And S4, recording the actual charging time of an ignition coil connected with a spark plug to be tested when the instantaneous rotating speed change value of the engine after the target cylinder is ignited is larger than the preset rotating speed change value.
When the target cylinder is ignited, the instantaneous rotating speed of the engine can change under the driving of the target cylinder, and when the instantaneous rotating speed change value of the engine is larger than the preset rotating speed change value, the actual charging time of an ignition coil connected with a spark plug to be tested is recorded. That is, whether the spark plug to be tested is aged or not is indirectly monitored by judging the relation between the change degree of the instantaneous rotating speed of the engine and the charging time of the ignition coil connected with the spark plug to be tested. It should be noted that the ignition coil is connected to the spark plug and is used to supply electric power to the spark plug to enable the spark plug to discharge. In the using process, the ignition coil is charged firstly, when the gas cylinder needs to be ignited, the ignition coil provides energy for the spark plug, the spark plug discharges electricity, and then the mixed gas in the gas cylinder is ignited.
Further, in the present embodiment, the instantaneous rotational speed variation value in step S4 is the difference between the instantaneous rotational speed of the engine at the time of target cylinder ignition and the instantaneous rotational speed of the engine at the time of preceding cylinder ignition. The front cylinder is a gas cylinder whose ignition sequence is before the target cylinder. That is, the front cylinder is a gas cylinder that is located before the target cylinder in the engine ignition sequence. Illustratively, there are six gas cylinders in the engine, which are labeled as a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder, and a sixth cylinder in that order for ease of distinction. Illustratively, the engine is fired in the order of first, fifth, third, sixth, second, and fourth cylinders, i.e., the first cylinder is fired first, then the fifth cylinder is fired, and then the cylinders are fired in that order. When the target cylinder is the first cylinder, the front cylinder is the fourth cylinder, and when the target cylinder is the second cylinder, the front cylinder is the sixth cylinder. By setting the instantaneous rotational speed variation value as the difference between the instantaneous rotational speed of the engine at the time of ignition of the target cylinder and the instantaneous rotational speed of the engine at the time of ignition of the preceding cylinder, the degree of increase in the engine rotational speed after ignition of the target cylinder can be determined. It should be noted that the instantaneous speed of the engine at the time of ignition of the front cylinder may also be understood as the instantaneous speed of the engine at the previous time.
S5, determining an aging coefficient of the spark plug to be tested, wherein the aging coefficient is the ratio of the actual charging time to the standard charging time, and the standard charging time is the charging time of the ignition coil, which enables the instantaneous rotating speed change value of the engine to be larger than the preset rotating speed change value when the ignition coil is connected with the unaged spark plug.
After determining the actual charging time of the ignition coil connected to the spark plug to be tested when the instantaneous speed variation value of the engine reaches the preset speed variation value when the target cylinder is ignited, determining the aging coefficient k of the spark plug to be tested, wherein k is ts/tbWherein, tsIndicating the actual charging duration, t, of the ignition coil connected to the spark plug to be testedbIndicating the standard charging time of the ignition coil connected with the unaged spark plug to be tested under the same condition. The larger the coefficient is, the longer the charging time required by the ignition coil connected with the spark plug to be tested is, and the larger the aging degree of the spark plug to be tested is reflected. It should be noted that the standard charging duration may be understood as the minimum charging duration of the ignition coil that makes the instantaneous speed variation value of the engine greater than the preset speed variation value when the ignition coil is connected to the unaged spark plug, that is, the charging duration of the ignition coil when the instantaneous speed variation value of the engine is just greater than the preset speed variation value. The standard charging time can pass the testThe experimental method is obtained.
And S6, acquiring the current running mileage of the vehicle.
The aging degree of the spark plug to be tested is also related to the current running mileage of the vehicle, so that the current running mileage of the vehicle needs to be acquired. The current operating range of the vehicle is stored in a memory module of the vehicle.
And S7, if the aging coefficient of the spark plug to be tested is larger than a preset aging coefficient and the current running mileage of the vehicle is smaller than a preset mileage, determining that the monitoring result of the spark plug to be tested is in an aging state.
The monitoring result of the spark plug to be tested can comprise that the spark plug to be tested is not aged and the spark plug to be tested is aged and cannot be used continuously. Optionally, according to the aging coefficient k of the spark plug and the current running mileage of the vehicle, a standard table of the aging degree of the spark plug (obtained through multiple tests) can be inquired, so that the real aging degree of the spark plug to be tested is obtained. In the table, the horizontal axis represents the aging factor of the spark plug, the vertical axis represents the vehicle mileage, and the degree of aging of the spark plug, such as light aging, moderate aging, or severe aging, is shown in the table. Since the degree of aging of the spark plug is also closely related to the current running mileage of the vehicle, a spark plug with the same aging factor indicates a higher degree of aging if the running mileage of the vehicle is shorter.
In the method for monitoring the aging of the spark plug provided by the embodiment, when the engine is in a preset detection working condition, firstly, the Lamda closed-loop control is started, the target cylinder is ignited, and then, when the instantaneous rotating speed change value of the engine is recorded to be greater than the preset rotating speed change value when the target cylinder is ignited, the actual charging time length of the ignition coil of the spark plug to be tested is connected, so that the aging coefficient of the spark plug to be tested is obtained according to the actual charging time length. And if the aging coefficient of the spark plug to be tested is larger than the preset aging coefficient and the current running mileage of the vehicle is smaller than the preset mileage, determining that the monitoring result of the spark plug to be tested is in an aging state. The method can detect the spark plug on line in real time so as to replace the aged spark plug in time, ensure the normal work of the engine, and ensure that the accuracy of the monitoring result can be higher by a monitoring mode of combining the aging coefficient of the spark plug to be detected and the current running mileage of the vehicle.
In addition, the monitoring working condition of the spark plug aging monitoring method is the period of engine oil cut, and the use of drivers and passengers is not influenced. The method can monitor the aging state of the spark plug on line safely and reliably without disassembling on the basis of not changing the hardware technical conditions of the prior engine. The method has the advantages of simple steps, convenience in operation, realization of the principle based on the algorithm, no need of adding extra hardware equipment, low cost and suitability for popularization.
Optionally, in this embodiment, the preset detection condition may include: the engine has no fault code, the target cylinder is not in an ignition working state, the vehicle is in a neutral gear state and the engine speed is greater than a preset speed. In the embodiment, the aging monitoring system of the spark plug can be used for sequentially judging the conditions. Illustratively, the determination process is as follows:
and S11, judging whether the engine has a fault code, if not, executing a step S12, and if so, ending the process.
When the engine has a fault, an electric control system (such as an ECU) of the vehicle can generate a fault code indicating the fault of the engine, the spark plug aging monitoring method system can search the fault code, if the fault code is searched, the engine has a fault, and at the moment, the monitoring of the spark plug to be detected needs to be stopped; if the fault code is not found, the surface engine is not in fault, and at this time, the step S12 may be continuously executed.
And S12, judging whether the target cylinder is in an ignition working state, if not, executing a step S13, and if so, ending the process.
The target cylinder has an ignition working state and a non-ignition working state, when the target cylinder is in the ignition working state, a spark plug in the target cylinder generates a discharge phenomenon, and at the moment, the spark plug cannot be monitored. When the target cylinder is in the non-ignition working state, the spark plug in the target cylinder is not discharged, and at the moment, the spark plug can be monitored.
And S13, judging whether the vehicle is in a neutral gear state, if so, executing a step S14, and if not, ending the process.
If the vehicle is in gear, the change in the instantaneous engine speed is susceptible to other factors other than spark plugs, such as the transmission, axles or other accessories, which may lead to false positives. Therefore, it is necessary to determine whether the vehicle is in a neutral state.
And S14, judging whether the rotating speed of the engine is greater than a preset rotating speed, if so, determining that the engine of the vehicle is in a preset detection working condition, otherwise, ending the process, and failing to monitor the spark plug to be detected.
The condition setting is to prevent that the monitoring is not completed, the rotating speed of the engine falls into the idle speed interval too fast, so that the monitoring cannot be continued, and therefore, the preset rotating speed must be set for control, so that the monitoring process can be started at a relatively high rotating speed of the engine, and the accuracy of the monitoring result is further ensured.
Optionally, after step S2 and before step S3, the method for monitoring aging of a spark plug further comprises:
s21, adjusting the charging time of the ignition coil connected with the spark plug to be tested to be the initial charging time t0。
The spark plug comprises an ignition coil, and when the spark plug needs to be ignited, the ignition coil needs to be charged in advance. The spark plug aging monitoring system can control the charging time of the ignition coil, and before monitoring, the charging time of the ignition coil can be controlled to be the initial charging time t0. The initial charging time t0May be the same or slightly less than the charging period of the ignition coil when the engine is operating normally.
Alternatively, in step S3, the spark plug to be tested is controlled to discharge at a preset ignition timing to ignite the target cylinder. The preset ignition timing may be any one of a plurality of ignition timings of the target cylinder. When the object in the target cylinder rotates, the upper dead point exists, when the object moves to the upper dead point, the ignition time can be recorded as 0, when the object continues to rotate for a preset angle, the ignition time can be recorded as 1, and the like. In step S7, the preset ignition timing may be set to 0, 1, 2, etc., and for example, when the preset ignition timing is set to 1, the ignition plug is controlled to perform ignition discharge so that the mixture in the target cylinder is combusted when the angle at which the object in the target cylinder is rotated corresponds to the ignition timing 1.
Alternatively, as shown in fig. 2, step S4 may include:
s41, judging whether the instantaneous rotating speed change value of the engine is smaller than the preset rotating speed change value when the target cylinder is ignited, if so, executing a step S42, and if not, executing a step S45.
In step S41, when the instantaneous rotational speed variation value of the engine during the ignition of the target cylinder does not reach the preset rotational speed variation value, which indicates that the instantaneous rotational speed increase degree of the engine during the ignition of the target cylinder does not reach the requirement, in this case, the target cylinder needs to be ignited again in order to monitor the accuracy of the result. When the instantaneous rotating speed change value of the engine reaches the preset rotating speed change value when the target cylinder is ignited, the instantaneous rotating speed increase degree of the engine reaches the monitoring requirement when the target cylinder is ignited, and at the moment, the Lamda closed-loop control can be closed.
S42, judging whether the charging time length of the ignition coil connected with the spark plug to be tested is smaller than the upper limit of the charging time length, if so, executing a step S43, and if not, executing a step S45.
Through setting up the time length upper limit of charging, can prevent to damage the condition of spark plug or ignition coil that awaits measuring because of the long overlength of the ignition coil charge who connects the spark plug that awaits measuring, and then avoid hardware circuit ashen trouble scheduling problem, consequently need control the time length upper limit of the ignition coil charge who connects the spark plug that awaits measuring. When the charging time of an ignition coil connected with a spark plug to be tested is longer than the upper limit of the charging time, the Lamda closed-loop control needs to be closed; when the charging time length of the ignition coil connected with the spark plug to be tested is less than the upper limit of the charging time length, the target cylinder can be ignited again. The upper limit of the charging period may be a preset value, and the value is stored in advance in an electronic control system of the vehicle through which the spark plug degradation monitoring system passes.
And S43, increasing the charging time of the spark plug to be tested by the target time t, and controlling the spark plug to be tested to discharge at the next preset ignition moment of the target cylinder so as to ignite the target cylinder again.
Instantaneous engine speed upon target cylinder ignitionWhen the variation value does not reach the preset variation value of the rotating speed and the charging time of the ignition coil connected with the spark plug to be tested is less than the upper limit of the charging time, the charging time of the ignition coil connected with the spark plug to be tested can be increased by the target time t on the basis of the original charging time, namely, the longer charging time is used for charging the ignition coil connected with the spark plug to be tested so as to improve the instantaneous variation value of the rotating speed of the engine when the target cylinder is ignited. Illustratively, the charging time of the ignition coil connected with the spark plug to be tested is the initial charging time t0In the meantime, when the process proceeds to step S43, it is necessary to extend the charging period with the spark plug to (t)0+ t) and with (t)0And the duration of + t) is the charging time of an ignition coil connected with the spark plug to be tested. And controlling the spark plug to be tested to discharge at the preset ignition moment of the target cylinder so as to ignite the mixed gas in the target cylinder again. Optionally, if the target time length t is larger, the measured value is not accurate; if the stepping value is smaller, the testing time is too long, and the stepping value needs to be calibrated on line in order to take efficiency and accuracy into consideration.
S44, judging whether the rotating speed of the engine is less than the lower limit of the rotating speed, if so, executing a step S45, and if not, executing a step S41.
The condition setting is to avoid that the monitoring cannot be continued and normal engine operation is influenced because the rotating speed of the engine falls into an idle speed interval, prejudge is carried out in advance, and the monitoring process is shut down when the lower limit of the rotating speed change value before the engine enters the idle speed. If the rotating speed of the engine is greater than or equal to the lower rotating speed limit, the step S41 needs to be executed again in a circulating manner, that is, the relationship between the instantaneous rotating speed variation value of the engine and the preset rotating speed variation value when the target cylinder is ignited is judged again, and if the instantaneous rotating speed variation value of the engine does not reach the preset rotating speed variation value when the target cylinder is ignited and the charging duration of the ignition coil connected with the spark plug to be tested is less than the upper charging duration limit, the charging duration of the ignition coil connected with the spark plug to be tested can be increased again until the instantaneous rotating speed variation value of the engine is greater than or equal to the preset rotating speed variation value when the target cylinder is ignited.
S45, closing Lamda closed-loop control, and recording the actual charging time t of the ignition coil connected with the spark plug to be testedsWhich isIn, ts＝t0+ nt, where n represents the number of cycles of steps S41-S44.
When step S41 is executed, the determination result is that the instantaneous rotational speed variation value of the engine at the time of ignition of the target cylinder is greater than or equal to the preset rotational speed variation value, at which time the actual charging period ts＝t0When the step S41 is executed again after the steps S41-S44 are cycled once, the determination result is that the instantaneous speed variation value of the engine is greater than or equal to the preset speed variation value when the target cylinder is ignited, and at this time, the actual charging time period t iss＝t0+ t; after the step S41-S44 is cycled for three times, the actual charging time ts＝t0+3 t. So as to gradually increase the charging time of the ignition coil connected with the spark plug to be tested.
The order of the steps in this embodiment may be adjusted, and this embodiment is not limited.
Example two
The present embodiment also provides a spark plug degradation monitoring system capable of executing the spark plug degradation monitoring method according to one of the above embodiments, as shown in fig. 3, the spark plug degradation monitoring system including:
the determination module 401 is configured to determine that an engine of a vehicle is in a preset detection condition.
An opening module 402 is configured to open the Lamda closed-loop control to provide air to a target cylinder of the engine in which a spark plug under test is located.
And the control module 403 is used for igniting the target cylinder through the spark plug to be tested, and recording the actual charging time of an ignition coil connected with the spark plug to be tested when the instantaneous rotating speed change value of the engine is greater than the preset rotating speed change value when the target cylinder is ignited.
The first determining module 404 is configured to determine an aging coefficient of the spark plug to be tested, where the aging coefficient is a ratio of an actual charging time to a standard charging time, and the standard charging time is a charging time of the ignition coil that is used to make an instantaneous speed change value of the engine greater than a preset speed change value when the ignition coil is connected to the unaged spark plug.
And the obtaining module 405 is used for obtaining the current running mileage of the vehicle.
And a second determining module 406, configured to determine that the monitoring result of the ignition coil connected to the spark plug to be tested is in an aging state if the aging coefficient of the spark plug to be tested is greater than the preset aging coefficient and the current operating mileage of the vehicle is less than the preset mileage.
In the aging monitoring system for the spark plug provided by this embodiment, when the engine is in the preset detection condition, the Lamda closed-loop control is firstly opened, the target cylinder is ignited, then the actual charging time length of the ignition coil of the spark plug to be detected is connected when the instantaneous rotating speed variation value of the engine when the target cylinder is ignited is greater than the preset rotating speed variation value, so as to obtain the aging coefficient of the spark plug to be detected according to the actual charging time length, and finally the monitoring result of the spark plug to be detected is obtained according to the aging coefficient of the spark plug to be detected and the current operating mileage of the vehicle, if the aging coefficient of the spark plug to be detected is greater than the preset aging coefficient and the current operating mileage of the vehicle is less than the preset mileage, the monitoring result of the spark plug to be detected is determined to be in an aging state, the aging monitoring system for the spark plug can detect the spark plug online in real time, so as to replace the aged spark plug in time, the normal work of the engine is ensured, and the accuracy of the monitoring result can be higher through a monitoring mode of combining the aging coefficient of the spark plug to be detected and the current running mileage of the vehicle.
Optionally, the ignition device further comprises an adjusting module, wherein the adjusting module is used for adjusting the charging time of the ignition coil connected with the spark plug to be tested to the initial charging time t0。
Optionally, the first determining module 404 may include:
and the fifth judging unit is used for judging whether the instantaneous rotating speed change value of the engine is smaller than the preset rotating speed change value when the target cylinder is ignited.
And the sixth judging unit is used for judging whether the charging time of the ignition coil connected with the spark plug to be tested is less than the upper limit of the charging time.
A control unit for increasing the charging time of the ignition coil connected with the spark plug to be tested by the target time t and controlling the spark plug to be tested to discharge at the next preset ignition moment of the target cylinder so as to re-ignite the target cylinder, and the control unit is used for controlling the ignition coil to be tested to discharge at the next preset ignition moment of the target cylinderClosing the Lamda closed-loop control, and recording the actual charging time ts of the ignition coil connected with the spark plug to be tested, wherein ts＝t0+ nt, where n represents the number of cycles of steps S41-S44.
And a seventh judging unit for judging whether the rotation speed of the engine is less than the lower limit of the rotation speed.
EXAMPLE III
Embodiments of the present invention also provide a storage medium having a computer program stored thereon, which when executed, implements the spark plug degradation monitoring method according to the above-described embodiments of the present invention.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the operations in the spark plug degradation monitoring method described above, and may also perform the relevant operations in the spark plug degradation monitoring method provided by the embodiments of the present invention, and has the corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the spark plug aging monitoring method according to the embodiments of the present invention.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method of monitoring spark plug degradation, comprising the steps of:
s1, determining that the engine of the vehicle is in a preset detection working condition;
s2, opening Lamda closed-loop control to provide air for a target cylinder where a spark plug to be tested is located in the engine;
s3, igniting the target cylinder through the spark plug to be tested;
s4, recording the actual charging time of an ignition coil connected with the spark plug to be tested when the instantaneous rotating speed change value of the engine after the target cylinder is ignited is larger than a preset rotating speed change value;
s5, determining an aging coefficient of the spark plug to be tested, wherein the aging coefficient is the ratio of the actual charging time to a standard charging time, and the standard charging time is the charging time of the ignition coil, which is used for enabling the instantaneous rotating speed change value of the engine to be larger than the preset rotating speed change value when the ignition coil is connected with the unaged spark plug;
s6, acquiring the current running mileage of the vehicle;
and S7, if the aging coefficient of the spark plug to be tested is larger than a preset aging coefficient and the current running mileage of the vehicle is smaller than a preset mileage, determining that the monitoring result of the spark plug to be tested is in an aging state.
2. The method of claim 1, wherein said predetermined sensing conditions include: the engine has no fault code, the target cylinder is not in an ignition working state, the vehicle is in a neutral state, and the engine speed is greater than a preset speed.
3. The spark plug degradation monitoring method according to claim 1, wherein after step S2, the spark plug degradation monitoring method further comprises:
s21, adjusting the charging time of the ignition coil connected with the spark plug to be tested to be initial charging time t0。
4. The method for monitoring deterioration of a spark plug according to claim 3, wherein in step S3, the spark plug under test is controlled to discharge at a preset ignition timing to ignite the target cylinder.
5. The spark plug degradation monitoring method according to claim 4, wherein the instantaneous rotation speed variation value is a difference between an instantaneous rotation speed of the engine when the target cylinder is ignited and an instantaneous rotation speed of the engine when a preceding cylinder, which is a gas cylinder whose ignition sequence is prior to the target cylinder, is ignited.
6. The method for monitoring deterioration of a spark plug according to claim 5, wherein the step S4 includes:
s41, judging whether the instantaneous rotating speed change value of the engine is smaller than the preset rotating speed change value when the target cylinder is ignited, if so, executing a step S42, and if not, executing a step S45;
s42, judging whether the charging time of the ignition coil connected with the spark plug to be tested is smaller than the upper limit of the charging time, if so, executing a step S43, otherwise, executing a step S45;
s43, increasing the charging time of an ignition coil connected with the spark plug to be tested by a target time t, and controlling the spark plug to be tested to discharge at the next preset ignition time of the target cylinder so as to ignite the target cylinder again;
s44, judging whether the rotating speed of the engine is smaller than the lower limit of the rotating speed, if so, executing a step S45, and if not, executing a step S41;
s45, closing the Lamda closed-loop control, and recording the actual charging time t of the ignition coil connected with the spark plug to be testedsWherein, ts＝t0+ nt, where n represents the number of cycles of steps S41-S44.
7. A spark plug degradation monitoring system, comprising:
the determining module is used for determining that an engine of the vehicle is in a preset detection working condition;
the starting module is used for starting Lamda closed-loop control to provide air for a target cylinder where a spark plug to be tested is located in the engine;
the control module is used for igniting the target cylinder through the spark plug to be tested and recording the actual charging time of an ignition coil connected with the spark plug to be tested when the instantaneous rotating speed change value of the engine is greater than the preset rotating speed change value after the target cylinder is ignited;
the first determining module is used for determining an aging coefficient of the spark plug to be tested, wherein the aging coefficient is the ratio of the actual charging time to a standard charging time, and the standard charging time is the charging time of the ignition coil, which is used for enabling the instantaneous rotating speed change value of the engine to be greater than the preset rotating speed change value when the ignition coil is connected with the unaged spark plug;
the acquisition module is used for acquiring the current running mileage of the vehicle;
and the second determination module is used for determining that the monitoring result of the spark plug to be tested is in an aging state if the aging coefficient of the spark plug to be tested is greater than a preset aging coefficient and the current running mileage of the vehicle is less than a preset mileage.
8. The system of claim 7, further comprising an adjustment module for adjusting a charging duration of an ignition coil connected to the spark plug under test to an initial charging duration t0。
9. The spark plug degradation monitoring system of claim 7, wherein the first determination module comprises:
a fifth judging unit, configured to judge whether an instantaneous rotation speed variation value of the engine is smaller than the preset rotation speed variation value when the target cylinder is ignited;
a sixth judging unit, configured to judge whether a charging duration of an ignition coil connected to the spark plug to be tested is less than an upper limit of the charging duration;
a control unit for increasing the charging time of the ignition coil connected with the spark plug to be tested by a target time t, controlling the spark plug to be tested to discharge at the next preset ignition moment of the target cylinder so as to ignite the target cylinder again, closing the Lamda closed-loop control, and recording the actual charging time t of the ignition coil connected with the spark plug to be testedsWherein, ts＝t0+ nt, where n represents the number of cycles of steps S41-S44;
and the seventh judging unit is used for judging whether the rotating speed of the engine is less than the lower limit of the rotating speed.
10. A storage medium having stored thereon a computer program, characterized in that the program, when executed, implements a spark plug degradation monitoring method as claimed in any one of claims 1-6.
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| CN113374612B (en) * | 2021-06-28 | 2022-11-29 | 潍柴动力股份有限公司 | Ignition coil charging duration correction method and device |
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