CN115839294B - Method for judging electrode gap failure of spark plug of engine - Google Patents
Method for judging electrode gap failure of spark plug of engine Download PDFInfo
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- CN115839294B CN115839294B CN202211639220.XA CN202211639220A CN115839294B CN 115839294 B CN115839294 B CN 115839294B CN 202211639220 A CN202211639220 A CN 202211639220A CN 115839294 B CN115839294 B CN 115839294B
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Abstract
The invention discloses a judging method for electrode gap failure of an engine spark plug, and relates to the technical field of engine fault detection. The judging method for the electrode gap failure of the spark plug comprises the following steps: acquiring the discharge duration of an ignition coil of each cylinder of the engine at the same rotating speed and the same load, comparing the discharge duration of the ignition coil of each cylinder with a preset limit value of the discharge duration, and obtaining a cylinder with the discharge duration of the ignition coil being greater than or equal to the preset limit value; and comparing the discharge duration of the ignition coil with the discharge duration of the cylinder with the preset limit value or more to obtain the maximum value and the minimum value. The difference between the maximum and minimum values is calculated. Judging whether the difference value is larger than a preset maximum deviation value, if so, judging that the spark plug electrode gap failure fault exists in the engine. By determining that the engine has a spark plug electrode gap failure fault, corresponding control measures can be output to reduce the risk of damage to the engine's exhaust system.
Description
Technical Field
The invention relates to the technical field of engine fault detection, in particular to a method for judging electrode gap failure of an engine spark plug.
Background
The ignition system is an important component of the ignition engine, and whether the performance of the ignition system is good or not has great influence on the power, the oil consumption, the exhaust pollution and the like of the engine. The ignition system is generally composed of a storage battery, a generator, a distributor, an ignition coil, a spark plug and the like, and can generate electric sparks between two electrodes of the spark plug.
The spark plug is used for discharging the pulse high voltage sent by the high voltage wire to break down the air between the two electrodes of the spark plug, so as to generate electric spark to ignite the mixed gas in the cylinder. Too large or too small an electrode gap of the spark plug can cause problems of misfire or cylinder starvation, the engine may exhibit insufficient power torque, and a large amount of fuel may burn inside the exhaust system from the exhaust valve to the exhaust system over time. In the existing engine fault detection mode, the related faults of the spark plug gap cannot be detected, and the exhaust system is damaged.
Disclosure of Invention
The invention aims to provide a judging method for the electrode gap failure of an engine spark plug, which can reduce the risk of damage to an exhaust system.
To achieve the purpose, the invention adopts the following technical scheme:
the method for judging the electrode gap failure of the spark plug of the engine comprises the following steps:
acquiring the discharge duration of an ignition coil of each cylinder of the engine at the same rotating speed and the same load;
Comparing the discharge duration of the ignition coil of each cylinder with a preset limit value of the discharge duration to obtain a cylinder with the discharge duration of the ignition coil being greater than or equal to the preset limit value;
Comparing the discharge duration of the ignition coil with the discharge duration of the cylinder with the preset limit value to obtain a maximum value and a minimum value;
Calculating a difference between the maximum value and the minimum value;
and judging whether the difference value is larger than a preset maximum deviation value, if so, judging that the spark plug electrode gap failure fault exists in the engine.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, after the step of determining that the failure of the electrode gap of the spark plug exists in the engine, the method further comprises: and judging that a cylinder with a spark plug electrode gap failure fault exists in the engine.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, the method for determining the presence of the cylinder having the failure of the electrode gap of the spark plug in the engine comprises the steps of:
establishing a basic table of discharge duration of the ignition coil based on the rotating speed and the load;
and judging whether the discharge duration of the ignition coil of each cylinder is beyond the basic value + -offset, if so, judging that the cylinder has a fault of electrode gap failure of the spark plug.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, the method further comprises the steps of:
Judging whether the discharge duration of the ignition coil of the cylinder is larger than a basic value plus an offset, if so, the electrode gap of the spark plug of the cylinder is too small;
And judging whether the discharge duration of the ignition coil of the cylinder is smaller than a basic value-offset, and if so, excessively large electrode gap of the spark plug of the cylinder.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, the method for determining the presence of the cylinder having the failure of the electrode gap of the spark plug in the engine comprises the steps of:
classifying a plurality of cylinders according to the discharge duration of the ignition coil of each cylinder to obtain the number of normal cylinders;
And then comparing the number of the obtained cylinders in the normal class with the minimum number of the preset normal class, and determining the cylinders needing to be checked for faults of electrode gap failure of the spark plug.
As an alternative to the method for judging the failure of the electrode gap of the spark plug of the engine, the method for obtaining the number of cylinders of the normal class is as follows:
defining the cylinder with the deviation from the maximum value within a first deviation range as a suspected clearance oversmall class;
Defining the cylinder with the deviation from the minimum value within a second deviation range as a suspected excessive clearance class;
A cylinder that does not belong to either the suspected too small class or the suspected too large class is defined as a normal class.
As an alternative to the determination method of the electrode gap failure of the spark plug of the engine, the method of determining the cylinder in which the electrode gap failure of the spark plug is to be detected includes the steps of:
Judging whether the number of the cylinders of the normal class is smaller than the minimum number of the preset normal class or not; if yes, checking the type with smaller number of cylinders in the suspected gap type and the suspected gap type; and if not, checking the cylinder with the suspected gap too small class and the cylinder with the suspected gap too large class at the same time.
As an alternative to the method for judging the failure of the electrode gap of the spark plug of the engine, the method for obtaining the discharge duration of each cylinder is as follows: under the same rotating speed and the same load of the engine, calculating the average value of the discharge duration time of the ignition coil of each cylinder in preset time; and sequencing the average value of the discharge durations of the ignition coils of the air cylinders with the discharge durations of the ignition coils being more than or equal to the preset limit value, and obtaining the maximum value and the minimum value.
As an alternative to the method for judging the failure of the electrode gap of the spark plug of the engine, the method for acquiring the discharge duration of the ignition coil is to monitor the voltage duration or the current duration of the primary coil; or alternatively, the first and second heat exchangers may be,
The method for acquiring the discharge duration of the ignition coil is to monitor the voltage duration or the current duration of the secondary coil.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, if the difference is less than or equal to the preset maximum deviation value, the detection is completed, and it is determined that the failure of the electrode gap of the spark plug does not exist in the engine.
As an alternative to the method for determining the failure of the electrode gap of the spark plug of the engine, if the discharge duration of the ignition coil of each cylinder is compared with a preset limit value of the discharge duration, it is obtained that the open circuit fault of the ignition system exists in the cylinder with the discharge duration of the ignition coil smaller than the preset limit value.
The invention has the beneficial effects that:
the invention provides a judging method for the failure of the electrode gap of an ignition plug of an engine, which comprises the steps of obtaining the discharge duration of each cylinder of the engine at the same rotating speed and the same load, comparing the discharge duration of each cylinder with a preset limit value of the discharge duration to obtain a cylinder with the discharge duration of an ignition coil being more than or equal to the preset limit value, comparing the discharge durations of the cylinders with the discharge duration of the ignition coil being more than or equal to the preset limit value to obtain a maximum value and a minimum value, calculating the difference value between the maximum value and the minimum value, and judging that the failure fault of the electrode gap of the ignition plug exists in the engine if the difference value is more than the preset maximum deviation value. When the ignition system ignites, the gap between the electrodes of the spark plug can break through air between the two electrodes of the spark plug only in the set gap, electric sparks are generated to ignite mixed gas in the cylinder, and poor ignition can be caused by too large or too small gap, if the gap is too large, the discharge duration is shorter, and if the gap is too small, the discharge duration is longer. According to the invention, the discharge duration of the ignition coil of each cylinder is monitored, and the cylinder of which the discharge duration of the ignition coil is smaller than the preset limit value of the discharge duration in each cylinder is firstly removed, so that the cylinder with the fault of the ignition coil is removed. And comparing the difference value between the maximum value and the minimum value of the other cylinders with a preset maximum deviation value, wherein if the other cylinders are normal, the discharge duration of the ignition coil of each cylinder is basically consistent, and the difference value between the maximum value and the minimum value is small. If a certain cylinder fails, the discharge duration of the ignition coil of that cylinder is abnormal, resulting in a large difference between the maximum value and the minimum value. And (3) by calculating the difference value between the maximum value and the minimum value and comparing the difference value with a preset maximum deviation value, judging whether the cylinder with faults exists in the rest cylinders. When the difference is larger than a preset maximum deviation value, the engine is judged to have a fault of failure of the electrode gap of the spark plug, so that corresponding control measures can be output to reduce the risk of damage to an exhaust system of the engine.
Drawings
FIG. 1 is a flow chart of a method for determining electrode gap failure of an engine spark plug according to an embodiment of the present invention;
FIG. 2 is a flow chart of one of the cylinders in which a spark plug electrode gap failure fault is determined in an engine according to an embodiment of the present invention;
FIG. 3 is a flow chart of another cylinder determination for spark plug electrode gap failure in an engine according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Unless expressly stated or limited otherwise, a first feature being "above" or "below" a 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 not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
An engine misfire refers to the fact that one or more cylinders of the engine do not or do not work sufficiently, which is commonly referred to as "engine cylinder deficiency". After the engine has a fire fault, serious shaking can occur, the engine has insufficient power, the automobile has weak acceleration and the oil consumption is increased. If multiple cylinders were to misfire, the engine may not start. There are many reasons for engine misfire, and this can be summarized in two general ways: an electrical control system failure and a mechanical part failure. The fault of the electric control system such as sensor signal missing or signal misalignment, control unit fault control signal error or no signal output, incapacity of ignition caused by an ignition system, incapacity of oil injection of an oil injector, line connection fault and the like; the failure of the mechanical part is mainly that the pressure of the cylinder is insufficient, such as the air valve is not tightly closed, air leakage is caused, and the gap among the cylinder, the piston and the piston ring is overlarge, so that the compression is insufficient, and the like.
If the ignition system of the engine fails, the failure of the ignition system includes an ignition coil failure and a spark plug electrode gap failure. The embodiment judges whether the spark plug electrode gap failure fault exists in the engine or not through monitoring the discharge duration time of the ignition system in each cylinder so as to reduce the risk of damage to the exhaust system of the engine.
As shown in fig. 1, the embodiment provides a method for judging the failure of the electrode gap of the spark plug of an engine, which comprises the following steps:
s10, acquiring the discharge duration of the ignition coil of each cylinder of the engine at the same rotation speed and the same load.
The timing is started at the discharge time of the ignition system, and is ended after the ignition system voltage is lower than a certain fixed value, and the period of time is defined as the discharge duration of the ignition coil.
The duration of the discharge of the ignition coil is related to the operating conditions of the engine and the state of the ignition system. The control unit of the engine obtains the discharge duration of the ignition coil by monitoring the voltage of the discharge process of the ignition system. The control unit of the motor detects the original signal of the discharging process as the voltage signal of the primary coil. In this embodiment, the initial voltage of the discharging process is set to be the system voltage +21v, the end voltage is set to be the system voltage +5.5v, and 21V and 5.5V are the calibration values of the engine under the set working condition and the ignition system under the set state. The system voltage is 24V of the battery.
Optionally, the method for obtaining the discharge duration of each cylinder is as follows: the average value of the discharge duration of the ignition coil of each cylinder in a preset time is calculated under the same rotation speed and the same load of the engine.
The method for acquiring the discharge duration of the ignition coil is to monitor the voltage duration or the current duration of the primary coil; alternatively, the discharge duration of the ignition coil is obtained by monitoring the voltage duration or the current duration of the secondary coil.
The ignition coil is used for converting low-voltage direct current into high-voltage electricity, the voltage can reach tens of thousands of volts, and the spark plug in the cylinder breaks down air to ionize to generate electric spark, so that the electric spark can repeatedly store and discharge energy at different frequencies according to different rotating speeds of the engine. When the primary coil is connected with a power supply, a strong magnetic field is generated along with the increase of current in the charging process, and the iron core stores magnetic field energy. When the switching device turns off the primary coil circuit, the magnetic field of the primary coil rapidly decays during the discharge process, and the secondary coil induces a high voltage. The magnetic field of the primary coil disappears quickly, the current is large at the moment of current interruption, and the larger the turn ratio of the two coils is, the higher the voltage induced by the secondary coil is. Thus, the discharge duration of the ignition coil may monitor the voltage duration or the current duration of the primary coil, as well as the voltage duration or the current duration of the secondary coil.
Because the voltage of the ignition coil in the discharging process is always fluctuated, in order to obtain the discharging duration of each cylinder more conveniently, the average value of the discharging duration of the ignition coil of each cylinder in the preset time is obtained after the original signal of the voltage of the ignition coil of each cylinder in the discharging process is filtered by setting a filter coefficient and the number of filter data. The preset time may be empirically set.
The average value of the discharge duration time of the multiple discharge processes in the preset time is obtained, so that the obtained discharge duration time of the multiple cylinders is more accurate, and the judgment of the electrode gap failure fault of the spark plug is more accurate.
S20, comparing the discharge duration of the ignition coil of each cylinder with a preset limit value of the discharge duration, and obtaining the cylinder with the discharge duration of the ignition coil being greater than or equal to the preset limit value.
The preset limit for the duration of the discharge is also the limit for a calibrated ignition coil when the ignition system is approaching an open circuit, in the case where a plurality of cylinders of the engine are all normal. The discharge duration of the ignition coil is short due to an open circuit failure of the ignition system. If a cylinder with the discharge duration of the ignition coil being smaller than the preset limit value of the discharge duration exists, the cylinder is judged to have an ignition system open circuit fault. Therefore, by comparing the discharge duration of the ignition coil of each cylinder with the preset limit value of the discharge duration, the open-circuit fault of the ignition system is obtained for the cylinders with the discharge duration smaller than the preset limit value of the ignition coil, the cylinders with the open-circuit fault of the ignition system are eliminated, and then whether the cylinders with the gap failure faults of the spark plugs exist in the other cylinders is judged.
S30, comparing the discharge duration of the ignition coil with the discharge duration of the cylinder with the preset limit value or more, and obtaining the maximum value and the minimum value.
And after the cylinders with the open-circuit faults of the ignition system are removed, the discharge duration of the rest cylinders is sequenced, and the maximum value and the minimum value are obtained.
S40, calculating the difference value between the maximum value and the minimum value.
If the cylinders of the engine are all normal, the discharge duration of the ignition coil of each cylinder is substantially uniform, and the difference between the maximum value and the minimum value is small. If a certain cylinder fails, the discharge duration of the ignition coil of that cylinder is abnormal, resulting in a large difference between the maximum value and the minimum value. And judging whether the other cylinders have the cylinder with the spark plug electrode gap fault or not by calculating the difference value of the maximum value and the minimum value.
And S50, judging whether the difference value is larger than a preset maximum deviation value, if so, judging that the engine has a fault that the electrode gap of the spark plug fails, and executing S60.
The preset maximum deviation value is a deviation of a maximum value and a minimum value of calibration under the condition that a plurality of cylinders of the engine are normal. And comparing the difference value with a preset maximum deviation value, and judging whether the other cylinders have the cylinder with the spark plug electrode gap fault.
If the difference value is smaller than or equal to the preset maximum deviation value, the detection is completed, and the engine is judged to have no failure fault of the electrode gap of the spark plug. If the difference value between the maximum value and the minimum value is smaller than or equal to the preset maximum deviation value, the engine is not in fault, and certainly, the electrode gap failure fault of the spark plug is not in fault, and the detection is completed.
When the ignition system ignites, the gap between the electrodes of the spark plug can break through air between the two electrodes of the spark plug only in the set gap, electric sparks are generated to ignite mixed gas in the cylinder, and poor ignition can be caused by too large or too small gap, if the gap is too large, the discharge duration is shorter, and if the gap is too small, the discharge duration is longer. In this embodiment, by monitoring the discharge duration of the ignition coil of each cylinder, the cylinders of each cylinder, in which the discharge duration of the ignition coil is smaller than the preset limit value of the discharge duration, are removed first, so as to remove the cylinders in which the ignition coil fails. And comparing the difference value between the maximum value and the minimum value of the other cylinders with a preset maximum deviation value, wherein if the other cylinders of the engine are normal, the discharge duration of the ignition coil of each cylinder is basically consistent, and the difference value between the maximum value and the minimum value is small. If a certain cylinder fails, the discharge duration of the ignition coil of that cylinder is abnormal, resulting in a large difference between the maximum value and the minimum value. And judging whether the cylinder with the fault exists in the rest cylinders or not by calculating the difference value between the maximum value and the minimum value. By comparing the difference value with a preset maximum deviation value, when the difference value is larger than the preset maximum deviation value, the occurrence of the failure fault of the electrode gap of the spark plug of the engine is judged, so that corresponding control measures can be output, and the risk of damage to an exhaust system of the engine is reduced.
When judging that the spark plug electrode gap failure fault exists in the engine, the method also needs to continuously judge which cylinder specifically has the spark plug electrode gap failure fault. Therefore, the step of determining that the engine has a spark plug electrode gap failure further comprises the steps of:
s60, judging that a cylinder with a spark plug electrode gap failure fault exists in the engine.
In the present embodiment, there are provided two methods of judging a cylinder, as shown in fig. 2, in which one method of judging a cylinder in which there is a failure in an electrode gap of a spark plug in an engine includes the steps of:
And S61, establishing a basic table of discharge duration time of the ignition coil based on the rotating speed and the load.
And calibrating a basic table of discharge duration of ignition coils of the engine at different rotation speeds and different loads under the condition that a plurality of cylinders of the engine are normal.
S62, judging whether the discharge duration of the ignition coil of the cylinder is beyond a basic value + -offset, if so, judging that the cylinder has a fault of electrode gap failure of the spark plug; if not, the cylinder does not have the failure fault of the electrode gap of the spark plug.
And inquiring the corresponding spark plug discharge duration in the basic table according to the actual rotating speed and the actual load of the engine to obtain a basic value. Since the voltage of the ignition plug during the discharge is fluctuated, the discharge duration of the ignition coil is fluctuated within a certain range. And the +/-offset is the fluctuation range of calibration.
When the discharge duration of the ignition coil of the cylinder is out of the basic value + -offset, the cylinder is indicated to have the fault of the electrode gap failure of the spark plug.
When the cylinder with the failure of the spark plug electrode gap is judged, judging whether the spark plug electrode gap of the cylinder fails due to the overlarge gap or fails due to the overlarge gap.
The method further comprises the following steps when judging that the cylinder with the spark plug electrode gap failure fault exists:
and judging whether the discharge duration of the ignition coil of the cylinder is larger than a basic value plus an offset, and if so, excessively small electrode gap of the spark plug of the cylinder.
And judging whether the discharge duration of the ignition coil of the cylinder is smaller than a basic value-offset, and if so, excessively large electrode gap of the spark plug of the cylinder.
If the discharge duration of the ignition coil is greater than the base value + the offset, it is indicated that the voltage of the spark plug is small, i.e. the electrode gap of the spark plug of the cylinder is too small. If the discharge duration of the ignition coil is less than the base value, the offset value indicates that the voltage of the spark plug is large, i.e., the electrode gap of the spark plug of the cylinder is too large.
As shown in fig. 3, another method for judging a cylinder in which a failure in an electrode gap of a spark plug exists in an engine provided in the present embodiment includes the steps of:
And S61', classifying the plurality of cylinders according to the discharge duration time of the ignition coil of the cylinder, and obtaining the number of the normal cylinders.
Specifically, the method for obtaining the number of the normal cylinders comprises the following steps:
defining a cylinder with a deviation from the maximum value within a first deviation range as a suspected clearance oversmall class;
defining a cylinder with a deviation from the minimum value within a second deviation range as a suspected gap oversized class;
A cylinder that does not belong to either the suspected too small class or the suspected too large class is defined as a normal class.
The method is based on empirical settings in which the number of failed cylinders among the plurality of cylinders of the engine is typically small and the number of normal types of cylinders is large. The plurality of cylinders are first classified into three types, the first type is a cylinder in which the discharge duration of the ignition coil is near the maximum value, and the discharge duration of the ignition coil of such a cylinder is long, and thus is a suspected gap too small type. The second type is a cylinder in which the discharge duration of the ignition coil is near the minimum value, and the discharge duration of the ignition coil of such a cylinder is short, and thus is a suspected gap-excessive type. The cylinders in which the discharge duration of the ignition coil is in the middle are classified into normal types.
The first deviation range and the second deviation range are numerical ranges calibrated according to tests, and the first deviation range and the second deviation range can be the same or different.
And S62', comparing the number of the obtained cylinders in the normal class with the minimum number of the preset normal class, and determining the cylinders needing to be checked for faults of electrode gap failure of the spark plug.
The minimum number of the preset normal classes is set according to the empirical value, the number of the obtained cylinders of the normal classes is compared with the minimum number of the preset normal classes, and the cylinders needing to be subjected to the troubleshooting of the electrode gap failure of the spark plug are judged. And manually checking the judged cylinder needing to check the electrode gap failure fault of the spark plug, thereby further confirming the cylinder with the electrode gap failure fault of the spark plug.
Specifically, the method for determining the cylinder needing to be checked for the failure of the electrode gap of the spark plug comprises the following steps: judging whether the number of the cylinders in the normal class is smaller than the minimum number of the preset normal class, if so, checking the class with the smaller number of the cylinders in the suspected gap oversmall class and the suspected gap oversmall class; if not, checking the cylinder with the suspected gap too small class and the suspected gap too large class at the same time.
In general, after the cylinder to be inspected is manually inspected, the cylinder with the failure fault of the electrode gap of the spark plug can be determined. And if the air cylinders with the spark plug electrode gap failure faults do not exist after manual investigation, then the investigation is carried out on the one with more air cylinders in the suspected gap too small class and the suspected gap too large class which are not subjected to investigation, so as to finally determine the air cylinders with the spark plug electrode gap failure faults.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.
Claims (11)
1. The method for judging the electrode gap failure of the spark plug of the engine is characterized by comprising the following steps of:
acquiring the discharge duration of an ignition coil of each cylinder of the engine at the same rotating speed and the same load;
Comparing the discharge duration of the ignition coil of each cylinder with a preset limit value of the discharge duration to obtain a cylinder with the discharge duration of the ignition coil being greater than or equal to the preset limit value;
Comparing the discharge duration of the ignition coil with the discharge duration of the cylinder with the preset limit value to obtain a maximum value and a minimum value;
Calculating a difference between the maximum value and the minimum value;
and judging whether the difference value is larger than a preset maximum deviation value, if so, judging that the spark plug electrode gap failure fault exists in the engine.
2. The method for determining a spark plug electrode gap failure of an engine according to claim 1, further comprising, after the step of determining that the engine has a spark plug electrode gap failure: and judging that a cylinder with a spark plug electrode gap failure fault exists in the engine.
3. The method of judging a failure of a spark plug electrode gap of an engine according to claim 2, characterized in that the method of judging a cylinder in which a failure of a spark plug electrode gap exists in the engine comprises the steps of:
establishing a basic table of discharge duration of the ignition coil based on the rotating speed and the load;
and judging whether the discharge duration of the ignition coil of the cylinder is beyond the basic value + -offset, if so, judging that the cylinder has a fault of failure of the electrode gap of the spark plug.
4. The method for judging a failure in an electrode gap of a spark plug of an engine according to claim 3, further comprising the steps of:
Judging whether the discharge duration of the ignition coil of the cylinder is larger than a basic value plus an offset, if so, the electrode gap of the spark plug of the cylinder is too small;
And judging whether the discharge duration of the ignition coil of the cylinder is smaller than a basic value-offset, and if so, excessively large electrode gap of the spark plug of the cylinder.
5. The method of judging a failure of a spark plug electrode gap of an engine according to claim 2, characterized in that the method of judging a cylinder in which a failure of a spark plug electrode gap exists in the engine comprises the steps of:
classifying a plurality of cylinders according to the discharge duration of the ignition coil of the cylinder to obtain the number of normal cylinders;
and then comparing the number of the obtained cylinders in the normal class with the minimum number of the preset normal class, and determining the cylinders needing to be checked for faults of electrode gap failure of the spark plug.
6. The method for judging a failure in an electrode gap of an ignition plug of an engine according to claim 5, wherein the method for obtaining the number of cylinders of a normal class is:
defining the cylinder with the deviation from the maximum value within a first deviation range as a suspected clearance oversmall class;
Defining the cylinder with the deviation from the minimum value within a second deviation range as a suspected excessive clearance class;
A cylinder that does not belong to either the suspected too small class or the suspected too large class is defined as a normal class.
7. The method for judging a failure in an electrode gap of a spark plug of an engine according to claim 6, wherein the method for determining a cylinder in which a failure in the electrode gap of the spark plug is to be checked comprises the steps of:
Judging whether the number of the cylinders of the normal class is smaller than the minimum number of the preset normal class or not; if yes, checking the type with smaller number of cylinders in the suspected gap type and the suspected gap type; and if not, checking the cylinder with the suspected gap too small class and the cylinder with the suspected gap too large class at the same time.
8. The method for judging a failure in an electrode gap of an ignition plug of an engine according to any one of claims 1 to 7, wherein the method for obtaining a discharge duration of each of said cylinders is: the average value of the discharge duration of the ignition coil of each cylinder in a preset time is calculated under the same rotating speed and the same load of the engine.
9. The method for judging a failure in a gap between electrodes of a spark plug of an engine according to claim 8, wherein the method for acquiring a discharge duration of the ignition coil is monitoring a voltage duration or a current duration of a primary coil; or alternatively, the first and second heat exchangers may be,
The method for acquiring the discharge duration of the ignition coil is to monitor the voltage duration or the current duration of the secondary coil.
10. The method for judging a failure in a spark plug electrode gap of an engine according to any one of claims 1 to 7, wherein if the difference is equal to or smaller than the preset maximum deviation value, the detection is completed, and it is judged that the failure in the spark plug electrode gap does not exist in the engine.
11. The method according to any one of claims 1 to 7, wherein a discharge duration of the ignition coil of each cylinder is compared with a preset limit value of the discharge duration, and an open circuit failure of the ignition system is found in the cylinder in which the discharge duration of the ignition coil is smaller than the preset limit value.
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| JP2010059838A (en) * | 2008-09-03 | 2010-03-18 | Ngk Spark Plug Co Ltd | Method for evaluating pollution resistance of spark plug and device for evaluating pollution resistance of spark plug |
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