CN110608097A - Engine misfire detection method - Google Patents
Engine misfire detection method Download PDFInfo
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- CN110608097A CN110608097A CN201810635086.3A CN201810635086A CN110608097A CN 110608097 A CN110608097 A CN 110608097A CN 201810635086 A CN201810635086 A CN 201810635086A CN 110608097 A CN110608097 A CN 110608097A
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- 238000001514 detection method Methods 0.000 title claims abstract description 82
- 239000000446 fuel Substances 0.000 claims abstract description 46
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 18
- 230000009977 dual effect Effects 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 10
- 238000012935 Averaging Methods 0.000 claims 3
- 230000007257 malfunction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 239000004243 E-number Substances 0.000 description 1
- 235000019227 E-number Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a method for detecting the fire of an engine, which comprises the steps of confirming whether the current working condition of the engine is a preset problem working condition, judging whether a front-stage two-point oxygen sensor is applied for auxiliary judgment according to whether the fire frequency in a preset period in the preset problem working condition is greater than a first threshold value or not, judging whether the fire of the engine is true fire or false fire according to a front oxygen signal and an air-fuel ratio adjusting factor fed back by an ECU (electronic control Unit), counting the fire frequency into the total fire frequency of the engine when the fire of the engine is true fire, and counting the fire frequency into the total fire frequency of the engine when the fire of the engine is false fire so that the total fire frequency can be correctly accumulated, ensuring the timeliness of fire fault detection, avoiding false fault caused by counting the false fire into the total fire frequency, the fire detection quality in the preset problem working condition is ensured, and the misjudgment rate of the fire detection of the engine is reduced.
Description
Technical Field
The invention relates to the field of engine fault detection, in particular to a method for detecting engine misfire.
Background
When the gasoline engine normally works, fuel and air are mixed according to a certain proportion, compressed, ignited by a spark plug and expanded to do work, but in some cases, problems occur in one of places such as an oil circuit, a circuit and a fire circuit of the engine, and the engine can be triggered to fail. After the engine catches fire, not only can cause the stationarity of engine operation, dynamic property and economic nature to descend, can lead to the increase of emission pollution because of incomplete combustion or not burning at all of fuel even more, in addition, the unburned fuel that brings of catching fire reacts in the catalyst converter, can lead to catalyst converter temperature to rise sharply, detect the trouble and can lead to the catalyst converter to appear irreversible damage in untimely time, therefore automatic diagnostic system (OBD) of car all can monitor the trouble of catching fire of engine, when monitoring that the number of times of catching fire exceeds the standard, also can set up corresponding fault code when lighting the trouble lamp of engine for inquiry and maintenance.
However, in some existing vehicles, for example, a dual-mass flywheel structure is adopted, or a hybrid power system is adopted, under some working conditions, the difference between the normal operation of the engine and the detection signal corresponding to the engine on fire is very low, so that the misjudgment rate of the on-fire detection is very high, and the difficulty is brought to the on-fire detection.
Disclosure of Invention
The invention aims to provide a method for detecting engine misfire, which aims to solve the problems of high misjudgment rate and the like of the conventional engine misfire detection.
In order to achieve the above object, the present invention provides a method of engine misfire detection, comprising:
l1: judging whether the current working condition of the engine is a preset problem working condition or not; if the current working condition of the engine is a preset problem working condition, executing a step L2;
l2: acquiring a misfire detection signal, counting the number of times of misfire of the engine in a set period according to the misfire detection signal, judging the number of times of misfire and a first threshold value, and executing a step L3 if the number of times of misfire is greater than the first threshold value;
l3: acquiring a front oxygen signal of the engine, judging whether the misfire of the engine is a true misfire according to the front oxygen signal, and executing a step L4 if the misfire of the engine is the true misfire;
l4: step L1 is executed by counting the misfire counts into the total misfire counts of the engine.
Optionally, the method for determining whether the current operating condition of the engine is the preset problem operating condition includes:
l11: judging whether the rotating speed and the torque of the engine are in the range of the preset problem working condition, and if so, executing a step L12;
l12: judging whether the gas mixture in the engine is in a closed loop state, and if the gas mixture in the engine is in the closed loop state, executing step L13;
l13: and judging whether the mixed gas in the previous driving cycle completes self-learning or not, and if the mixed gas in the previous driving cycle completes self-learning, determining the current working condition of the engine to be a preset problem working condition.
Optionally, the step of acquiring a pre-oxygen signal of the engine and determining whether the misfire of the engine is a true misfire according to the pre-oxygen signal includes:
acquiring the pre-oxygen signal, and calculating an air-fuel ratio adjustment average factor and an average factor initial value according to the pre-oxygen signal;
judging the magnitude of the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor and a second threshold value, if the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor is larger than the second threshold value, and the time for the average factor of the air-fuel ratio adjustment to continuously increase is larger than a fourth threshold value; or when the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor is larger than a third threshold value, the misfire of the engine is true misfire; otherwise, the misfire of the engine is false.
Optionally, when the difference between the average factor for air-fuel ratio adjustment and the initial value of the average factor is greater than the second threshold value, and the time for which the average factor for air-fuel ratio adjustment continuously increases is greater than the fourth threshold value, the misfire of the engine includes a one-cylinder continuous misfire; the misfire of the engine includes a two-cylinder misfire when a difference between the air-fuel ratio adjustment average factor and the initial value of the average factor is larger than the third threshold value.
Optionally, the third threshold is greater than the second threshold.
Optionally, the range of the second threshold includes 0.07-0.15, and the range of the third threshold includes 0.15-0.25.
Optionally, the fourth threshold is greater than or equal to 1 second.
Optionally, when the total misfire number is greater than or equal to a fifth threshold value, the engine gives a fault alarm.
Alternatively, the engine misfire detection method is applied to a vehicle having a dual mass flywheel configuration or a hybrid configuration.
The method for detecting the engine misfire provided by the invention comprises the steps of confirming whether the current working condition of the engine is a preset problem working condition, judging whether to apply a front oxygen signal for auxiliary judgment according to whether the misfire frequency in a preset period in the preset problem working condition is greater than a first threshold value, judging whether the engine misfire is a true misfire or a false misfire according to the front oxygen signal, when the misfire of the engine is a true misfire, counting the misfire count into a total engine misfire count, when the fire of the engine is the false fire, the total fire times of the engine are not counted, so that the total fire times can be correctly accumulated, the timeliness of fire fault detection is ensured, the false fire is prevented from being counted into the total fire times to cause the false alarm of the fault, the fire detection quality in the preset problem working condition is ensured, and the false judgment rate of the fire detection of the engine is reduced.
Drawings
FIG. 1 is a schematic diagram of a comparison of misfire detection signals at normal conditions with a true misfire for a vehicle having a dual mass flywheel configuration provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a misfire detection signal in a normal state for a vehicle of hybrid configuration provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a comparison of a pre-oxygen signal during a normal condition of an engine and a two-cylinder misfire provided in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart of a method of misfire detection for an engine provided in accordance with an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for determining whether a current operating condition of an engine is a predetermined problematic operating condition according to an embodiment of the present disclosure;
FIG. 6 is a comparison of a misfire detection method for a vehicle having a dual mass flywheel configuration according to an embodiment of the present invention using a conventional misfire detection method and a misfire detection method for an engine according to the present invention;
FIG. 7 is a comparison graph of a misfire detection method of an engine and a conventional misfire detection method for a vehicle having a dual mass flywheel configuration according to an embodiment of the present invention;
signal a1 — misfire detection signal when vehicle with dual mass flywheel structure is in normal condition;
signal a 2-misfire detection signal when a two-cylinder misfire in a vehicle with a dual mass flywheel structure;
signal a3 — misfire detection signal when the hybrid-structured vehicle is in a normal state;
signal a4 — misfire detection signal when the vehicle is in normal condition and continuous misfire condition;
signal a5 — misfire detection signal a5 for a vehicle of dual mass flywheel configuration;
signal a6 — misfire detection signal a6 for a vehicle of dual mass flywheel configuration;
signal b-pro-oxygen signal; signal c-air-fuel ratio adjustment factor; signal d-air-fuel ratio adjustment average factor, signal e-number of misfires detected by existing misfire detection methods; the signal e' -the misfire frequency detected by the engine misfire detection method provided by the invention; signal g-number of misfires detected at the time of misfire by existing misfire detection methods; the signal g' -the misfire detection method of the engine provided by the invention detects the number of times of misfire when the engine is in misfire, k-the engine cylinder order.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The inventor researches and discovers that most of existing engine misfire detection methods use a rotating speed sensor to calculate the rotating angular speed of a crankshaft of an engine to detect misfire, and a misfire detection signal depends on the torque and the rotational inertia of an engine shafting. For example: referring to fig. 1, which is a schematic view showing a comparison between misfire detection signals at the time of a normal state and a true misfire of a vehicle having a dual mass flywheel structure, in fig. 1, the abscissa is a vehicle operating time in seconds(s) and the ordinate is an engine cylinder number (0, 1, 2, 3 variation) and acceleration of a signal a1 and a signal a2 in revolutions per second, respectively2(r/s2) The signal a1 is a misfire detection signal when the vehicle with the dual-mass flywheel structure is in a normal state, the signal a2 is a misfire detection signal when the vehicle with the dual-mass flywheel structure is in a two-cylinder misfire state, and k is a cylinder sequence of the engine, so that the signal a1 and the signal a2 are low in discrimination and are easy to cause misjudgment; referring to fig. 2, which is a schematic diagram of a misfire detection signal of a hybrid-structure vehicle in a normal state, in fig. 2, the abscissa is a vehicle operation time in seconds(s), the ordinate is a voltage (V) and an acceleration of a3, respectively, the signal a3 is the misfire detection signal of the hybrid-structure vehicle in the normal state, the signal b is a front oxygen signal, and the signal a3 is abruptly changed and continuously raised, so that it is determined that the hybrid-structure vehicle has a misfire, but actually the hybrid-structure vehicle is in the normal state, so that an erroneous determination is made, and it can be seen from the signal b in fig. 2 that when the hybrid-structure vehicle is in a positive stateIn the normal state, the pro-oxygen signal changes periodically.
Referring next to fig. 3, which is a schematic diagram comparing the pre-oxygen signal when the engine misfires in two cylinders under normal conditions, in fig. 3, the abscissa is the vehicle operating time in seconds(s), the ordinate is the voltage (V) and the acceleration of the signal a4, respectively, the signal a4 is the misfire detection signal when the engine misfires in two cylinders under normal conditions, the signal b is the pre-oxygen signal, the signal c is the air-fuel ratio adjustment factor, and the signal d is the air-fuel ratio adjustment average factor, through further research, the inventor finds that, when the engine is under normal conditions, the pre-oxygen signal is in closed-loop control, the period of the pre-oxygen signal is determined by the engine operating conditions and the pre-matched air-fuel ratio closed-loop control parameters, the air-fuel ratio adjustment factor calculated from the pre-oxygen signal is also in periodic variation, and the adjustment amplitude depends on the time of the air-fuel mixture in rich side or lean side, because the period is fixed and the adjusting amplitude is also fixed, the adjusting amplitude of the air-fuel ratio can be reflected by using the average value of the air-fuel ratio adjusting factor-the air-fuel ratio adjusting average factor, as the left half part in figure 3, the changing amplitude of the air-fuel ratio adjusting average factor is smaller after the self-learning of the air-fuel ratio is finished in the normal state of the engine, and the air-fuel ratio adjusting average factor is basically stabilized near the air-fuel ratio 1; when the engine catches fire (right part in fig. 3), the front oxygen sensor senses the oxygen which is excessive out of the unburned gas mixture, so that the gas mixture is in a lean side for a long time, the air-fuel ratio adjusting factor can be adjusted for a long time even reaches an adjusting limit value of 1.25, then the gas mixture is totally rich due to excessive oil injection of an oil injector, the front oxygen signal is fast switched rich and lean, the air-fuel ratio adjusting average factor has obvious drift above 1, the drift degree depends on the severity of the fire, and the two-cylinder continuous fire is higher than the one-cylinder continuous fire.
Referring next to fig. 4, based on the above research, the present application provides a method for engine misfire detection, comprising:
s1: judging whether the current working condition of the engine is a preset problem working condition or not; if the current working condition of the engine is a preset problem working condition, executing step S2;
s2: acquiring a misfire detection signal, counting the number of times of misfire of the engine in a set period according to the misfire detection signal, judging the number of times of misfire and a first threshold value, and executing step S3 if the number of times of misfire is greater than the first threshold value;
s3: acquiring a front oxygen signal of the engine, judging whether the misfire of the engine is a true misfire according to the front oxygen signal, and executing step S4 if the misfire of the engine is a true misfire;
s4: the misfire count is counted into the total misfire count of the engine, and step S1 is executed.
The method comprises the steps of judging whether the fire of the engine is true fire or false fire according to the oxygen signal, counting the fire times into the total fire times of the engine when the fire of the engine is true fire, and counting the fire times into the total fire times of the engine when the fire of the engine is false fire, so that the total fire times can be correctly accumulated, the timeliness of fire fault detection is ensured, the false alarm of faults caused by counting the false fire into the total fire times is avoided, the fire detection quality in the preset problem working condition is ensured, and the false judgment rate of the fire detection of the engine is reduced.
Referring to fig. 5, it is first determined whether the current working condition of the engine is a preset problem working condition, and the misjudgment rate of the engine under the preset problem working condition is higher than that under other working conditions. The step of judging whether the current working condition of the engine is a preset problem working condition comprises the following steps:
s11: judging whether the rotating speed and the torque of the engine are in the range of the preset problem working condition, and if so, executing a step S12;
s12: judging whether the gas mixture in the engine is in a closed loop state, and if the gas mixture in the engine is in the closed loop state, executing step S13;
s13: and judging whether the mixed gas in the previous driving cycle completes self-learning or not, and if the mixed gas in the previous driving cycle completes self-learning, determining the current working condition of the engine to be a preset problem working condition.
The method comprises the following steps that when the engine simultaneously meets the conditions that the rotating speed and the torque are within the range of the preset problem working condition, the mixed gas is in a closed loop state, and the self-learning of the mixed gas in the previous driving cycle is completed, the current working condition of the engine is the preset problem working condition, otherwise, the current working condition of the engine is not the preset problem working condition.
When the current operating mode of engine is for predetermineeing the problem operating mode, acquire the detection signal that catches fire to according to the detection signal that catches fire makes statistics of the number of times of catching fire in a settlement cycle, for example: the set period is 100 times of engine ignition, the misfire frequency in 100 times of engine ignition is counted, and the misfire frequency is compared with the first threshold value, the first threshold value can be adjusted according to the misfire rate and the set period, and when the misfire rate is 2%, the first threshold value can be set to be 2. When the misfire number is larger than the first threshold value, for example, the misfire number is 3 times or more, then entering the next step; if the misfire count is equal to or less than the first threshold value, for example, if the misfire count is 2 or less, the influence of false failure alarm on the entire engine is small because the misfire count is small, and the process does not proceed to the true/false misfire determination process.
And when the fire frequency is greater than the first threshold value, the fire frequency is more, the influence on the overall fault misinformation of the engine is also larger, at the moment, the front oxygen signal is acquired, and whether the fire of the engine is true fire is judged according to the front oxygen signal. Specifically, an air-fuel ratio adjustment average factor and an average factor initial value are calculated through the pre-oxygen signal, the air-fuel ratio adjustment average factor is an average value of the air-fuel ratio adjustment factors, the average factor initial value is a mixed gas initial state when no fire occurs, and by comparing the difference value between the air-fuel ratio adjustment average factor and the average factor initial value with a second threshold value, if the difference value between the air-fuel ratio adjustment average factor and the average factor initial value is larger than the second threshold value and the time for which the air-fuel ratio adjustment average factor continuously increases is larger than a fourth threshold value, the fire of the engine is a true fire; or when the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor is larger than a third threshold value, the misfire of the engine is true misfire; otherwise, the misfire of the engine is false when the above two conditions are not met.
Specifically, when the difference between the average factor for air-fuel ratio adjustment and the initial value of the average factor is greater than the second threshold value, and the time for which the average factor for air-fuel ratio adjustment continuously increases is greater than the fourth threshold value, the misfire of the engine is one-cylinder continuous misfire; when the difference between the average factor for air-fuel ratio adjustment and the initial value of the average factor is greater than the third threshold value, the misfire of the engine is a two-cylinder misfire. Further, since the severity of the two-cylinder misfire is higher than the one-cylinder continuous misfire, the third threshold value is larger than the second threshold value, for example, the second threshold value ranges from 0.07 to 0.15, such as 0.08, 0.10, 0.12 or 0.14, and in this embodiment, the second threshold value is 0.08; the third threshold is in a range of 0.15 to 0.25, such as 0.17, 0.20, or 0.23, and in this embodiment, the third threshold is 0.15; the fourth threshold is a time threshold, and the value of the fourth threshold may be greater than or equal to 1 second, and in this embodiment, the fourth threshold is 1 second.
And judging whether the fire frequency in the preset problem working condition is counted into the total fire frequency of the engine or not, wherein the fire frequency in the preset problem working condition is counted into the total fire frequency when the fire of the engine is true fire, and the fire frequency in the preset problem working condition is not counted into the total fire frequency when the fire of the engine is false fire, so that the total fire frequency is closer to the actual condition, the detection precision is improved, and the misjudgment rate is reduced. When the total misfire frequency of the engine exceeds a fifth threshold value, the engine gives out a fault alarm, and when the total misfire frequency is larger than or equal to the fifth threshold value, the misfire of the engine can cause the OBD emission to exceed the standard; or the misfire fault is reported before the catalyst is damaged due to the misfire of the engine, so when the total misfire frequency of the engine exceeds the fifth threshold value, the engine gives a fault alarm to protect the catalyst in time and carry out fault maintenance.
Referring to fig. 6, which is a comparison diagram of a conventional misfire detection method and the engine misfire detection method of the present invention for a vehicle having a dual mass flywheel structure, in fig. 6, the abscissa is the vehicle operating time in seconds(s) and the ordinate is the adjustment factor, the misfire frequency, the adjustment factor offset and the adjustment time, respectively, wherein there is no unit for the adjustment factor and the misfire frequency, i.e., there is no unit for the adjustment factor offset, and there is no unit for the adjustment time which is a deviation from a set time threshold, a signal a5 is the misfire detection signal for the vehicle having the dual mass flywheel structure, a signal e is the misfire frequency detected by the conventional misfire detection method, and e' is the misfire frequency detected by the engine misfire detection method of the present invention, and it can be seen that the number of erroneous judgment by the conventional misfire detection method can be up to 400 or more, the method for detecting the engine misfire provided by the invention has the advantages that the maximum misjudged misfire frequency is 10 times, and is far lower than a misfire fault threshold value, so that the misjudgment rate of the misfire detection is greatly reduced.
Fig. 7 is a comparative diagram of a vehicle having a dual mass flywheel structure according to an embodiment of the present invention when a fire occurs according to a conventional fire detection method and a fire detection method of an engine according to the present invention, where in fig. 7, the abscissa is a vehicle operating time in seconds(s) and the ordinate is an adjustment factor, a number of times of fire, an adjustment factor offset, and an adjustment time, respectively, a signal a 6-a fire detection signal of a vehicle having a dual mass flywheel structure when a fire occurs, a signal g is the number of times of fire detected by the conventional fire detection method when a fire occurs, a signal g 'is the number of times of fire detected by the engine fire detection method of an engine according to the present invention, and it can be seen by comparing the signal g and the signal g', that when a true fire occurs in the engine, the engine detection method of an engine according to the present invention can accurately detect a fire and add the number of times of fire to the total number of fire, the method ensures that the condition of misfire misjudgment caused by introducing the method can not occur, and ensures the timeliness of the accuracy of misfire detection.
In summary, in the method for detecting an engine misfire provided in the embodiments of the present invention, it is determined whether a current working condition of the engine is a preset problem working condition, whether a pre-oxygen signal is applied for auxiliary determination is determined according to whether a misfire frequency in a preset period in the preset problem working condition is greater than a first threshold, and then whether the misfire of the engine is a true misfire or a false misfire is determined according to the pre-oxygen signal, when the misfire of the engine is a true misfire, the misfire frequency is counted into a total misfire frequency of the engine, and when the misfire of the engine is a false misfire, the total misfire frequency is not counted into the total misfire frequency of the misfire, so that the total misfire frequency can be correctly accumulated, thereby ensuring timeliness of misfire fault detection, avoiding false occurrence of faults caused by counting the false misfire in the total misfire frequency, and ensuring quality of the misfire detection in the preset problem working condition, the misjudgment rate of engine misfire detection is reduced.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method of engine misfire detection, characterized by: the method of engine misfire detection includes:
l1: judging whether the current working condition of the engine is a preset problem working condition or not; if the current working condition of the engine is a preset problem working condition, executing a step L2;
l2: acquiring a misfire detection signal, counting the number of times of misfire of the engine in a set period according to the misfire detection signal, judging the number of times of misfire and a first threshold value, and executing a step L3 if the number of times of misfire is greater than the first threshold value;
l3: acquiring a front oxygen signal of the engine, judging whether the misfire of the engine is a true misfire according to the front oxygen signal, and executing a step L4 if the misfire of the engine is the true misfire;
l4: step L1 is executed by counting the misfire counts into the total misfire counts of the engine.
2. The engine misfire detection method of claim 1, wherein the method of determining whether the current operating condition of the engine is a preset problem condition comprises:
l11: judging whether the rotating speed and the torque of the engine are in the range of the preset problem working condition, and if so, executing a step L12;
l12: judging whether the gas mixture in the engine is in a closed loop state, and if the gas mixture in the engine is in the closed loop state, executing step L13;
l13: and judging whether the mixed gas in the previous driving cycle completes self-learning or not, and if the mixed gas in the previous driving cycle completes self-learning, determining the current working condition of the engine to be a preset problem working condition.
3. The engine misfire detection method as recited in claim 1, wherein the step of obtaining a pre-oxygen signal of the engine and determining whether the misfire of the engine is a true misfire based on the pre-oxygen signal comprises:
acquiring the pre-oxygen signal, and calculating an air-fuel ratio adjustment average factor and an average factor initial value according to the pre-oxygen signal;
judging the magnitude of the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor and a second threshold value, if the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor is larger than the second threshold value, and the time for the average factor of the air-fuel ratio adjustment to continuously increase is larger than a fourth threshold value; or when the difference value between the average factor of the air-fuel ratio adjustment and the initial value of the average factor is larger than a third threshold value, the misfire of the engine is true misfire; otherwise, the misfire of the engine is false.
4. The engine misfire detection method as recited in claim 3, wherein the engine misfire comprises a cylinder continuous misfire when a difference between the air-fuel ratio adjustment averaging factor and the averaging factor initial value is greater than the second threshold value and a time at which the air-fuel ratio adjustment averaging factor continuously increases is greater than the fourth threshold value; the misfire of the engine includes a two-cylinder misfire when a difference between the air-fuel ratio adjustment average factor and the initial value of the average factor is larger than the third threshold value.
5. The engine misfire detection method as recited in claim 4, wherein the third threshold value is greater than the second threshold value.
6. The engine misfire detection method as recited in claim 5, wherein the range of the second threshold value includes 0.07-0.15 and the range of the third threshold value includes 0.15-0.25.
7. The engine misfire detection method as recited in claim 6, wherein the fourth threshold value is equal to or greater than 1 second.
8. The engine misfire detection method as recited in claim 1, wherein the engine performs a malfunction warning when the total number of misfires is equal to or greater than a fifth threshold value.
9. The method of engine misfire detection as recited in any of claims 1-8, wherein the method of engine misfire detection is applied to a vehicle having a dual mass flywheel configuration or a vehicle having a hybrid configuration.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156086A (en) * | 2020-01-09 | 2020-05-15 | 东风汽车集团有限公司 | Engine fire diagnosis system and method for hybrid electric vehicle |
| CN113074045A (en) * | 2021-04-22 | 2021-07-06 | 东风柳州汽车有限公司 | Engine misfire diagnosis method, engine misfire diagnosis device, engine misfire diagnosis equipment and storage medium |
| CN113460025A (en) * | 2021-07-22 | 2021-10-01 | 东风汽车集团股份有限公司 | Misfire diagnosis method under engine speed mode of hybrid electric vehicle and electronic equipment |
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| CN114810344A (en) * | 2021-01-29 | 2022-07-29 | 丰田自动车株式会社 | Misfire detection device for internal combustion engine |
| CN113074045A (en) * | 2021-04-22 | 2021-07-06 | 东风柳州汽车有限公司 | Engine misfire diagnosis method, engine misfire diagnosis device, engine misfire diagnosis equipment and storage medium |
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| CN114635795A (en) * | 2022-03-17 | 2022-06-17 | 东风汽车集团股份有限公司 | Fire monitoring method for hybrid electric vehicle and hybrid electric vehicle |
| CN114635795B (en) * | 2022-03-17 | 2023-09-19 | 东风汽车集团股份有限公司 | Method for monitoring fire of hybrid electric vehicle and hybrid electric vehicle |
| CN115263548A (en) * | 2022-04-02 | 2022-11-01 | 长城汽车股份有限公司 | Engine fire detection method and device, vehicle and storage medium |
| CN115355087A (en) * | 2022-08-19 | 2022-11-18 | 一汽解放汽车有限公司 | Engine fire fault alarm method and device, electronic equipment and storage medium |
| CN115355087B (en) * | 2022-08-19 | 2024-01-09 | 一汽解放汽车有限公司 | Engine fire fault alarm method and device, electronic equipment and storage medium |
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