CN111237073A - Method, device, storage medium and processor for diagnosing abnormal combustion of engine - Google Patents

Abstract

The present application discloses a method, device, storage medium and processor for diagnosing abnormal combustion of an engine. The method includes: calculating an exhaust gas temperature change rate and an exhaust gas temperature in a cylinder of the engine; when the exhaust gas temperature change rate is less than or equal to a first preset value, and/or the exhaust gas temperature is less than or equal to a second preset value , determine that there is a combustion abnormality in the cylinder of the engine; when the exhaust gas temperature change rate is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value In the case of setting the value, adjust the ignition advance angle and ignition power-on time in the cylinder, and judge whether there is a combustion abnormality in the engine cylinder according to the change rate of the exhaust temperature in the cylinder after adjustment and the exhaust temperature. The present application solves the problem in the related art that it is difficult to accurately determine whether there is abnormal combustion in the cylinder of the engine.

Description

Method, device, storage medium and processor for diagnosing abnormal combustion of engine

technical field

The present application relates to the technical field of engine control, and in particular, to a method, device, storage medium and processor for diagnosing abnormal combustion of an engine.

Background technique

During the operation of the engine, due to various reasons such as insufficient ignition energy, inaccurate ignition/injection advance angle, poor gas quality, poor diesel oil, failure of mechanical components such as cylinders, valves and pistons, etc., the combustion of each cylinder is abnormal, even misfire.

In the related art, the cause of the abnormal combustion is determined after the abnormal combustion occurs, and the combustion parameters are adjusted according to the cause of the abnormal combustion. The abnormal combustion cannot be diagnosed in a timely and accurate manner, and the adjustment timing is delayed, and the operation of the engine cannot be well improved. state.

For the problem in the related art that it is difficult to accurately determine whether there is abnormal combustion in the cylinder of the engine, no effective solution has been proposed so far.

SUMMARY OF THE INVENTION

The present application provides a method, device, storage medium and processor for diagnosing abnormal combustion of an engine, so as to solve the problem in the related art that it is difficult to accurately determine whether there is abnormal combustion in a cylinder of an engine.

According to one aspect of the present application, a method for diagnosing abnormal combustion of an engine is provided. The method includes: calculating the change rate of the exhaust gas temperature after in-cylinder ignition of the engine, and calculating the exhaust gas temperature after the ignition preset time; judging whether the change rate of the exhaust gas temperature is less than or equal to a first preset value, and judging the exhaust gas temperature Whether it is less than or equal to the second preset value; if the rate of change of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine; When the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and whether the exhaust gas temperature is less than or equal to the third preset value is determined. Four preset values; when the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, Adjust the ignition advance angle and ignition power-on time in the cylinder, and judge whether there is abnormal combustion in the cylinder of the engine according to the change rate of the exhaust temperature in the cylinder after adjustment and the exhaust temperature.

Optionally, when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and the exhaust gas temperature is determined. After whether it is less than or equal to the fourth preset value, the method further includes: in the case that the exhaust gas temperature change rate is greater than the third preset value and the exhaust gas temperature is greater than the fourth preset value, determining that the in-cylinder of the engine is in normal combustion state.

Optionally, before calculating the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine and calculating the exhaust gas temperature after the ignition preset time, the method further includes: judging whether there is an exhaust gas temperature sensor provided in the cylinder of the engine. Fault; in the case that the exhaust gas temperature sensor is not faulty, perform the steps of calculating the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculating the exhaust gas temperature after the ignition preset time.

Optionally, when the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the The ignition advance angle and ignition power-on time in the cylinder include: determining the ignition advance angle correction value according to the change rate of the exhaust gas temperature and the exhaust gas temperature; adding the ignition advance angle correction value on the basis of the current ignition advance angle to obtain the adjusted ignition advance angle. Ignition advance angle; determine the correction value of ignition and power-on time according to the change rate of exhaust temperature and exhaust temperature; add the correction value of ignition and power-on time on the basis of the current ignition and power-on time to obtain the adjusted ignition and power-on time.

Optionally, judging whether there is a combustion abnormality in the cylinder of the engine according to the rate of change of the exhaust gas temperature in the cylinder after the adjustment and the exhaust gas temperature includes: controlling the in-cylinder combustion engine based on the adjusted ignition advance angle and the adjusted ignition power-on time; Combustion; in a preset number of combustion cycles in the cylinder, obtain the exhaust gas temperature change rate and exhaust temperature respectively; determine whether the exhaust gas temperature change rate obtained in each combustion cycle is less than or equal to a third preset value, and Determine whether the exhaust gas temperature obtained in each combustion cycle is less than or equal to the fourth preset value; in the preset number of combustion cycles, obtain the number of times the exhaust gas temperature change rate is less than or equal to the third preset value, and obtain the first time and obtain the number of times that the exhaust gas temperature is less than or equal to the fourth preset value, and obtain the second number of times; determine whether the first number of times is greater than or equal to the first target number of times, and determine whether the second number of times is greater than or equal to the second target number of times, wherein, Both the first target number of times and the second target number of times are less than or equal to the preset number of times; when the first number of times is greater than or equal to the first target number of times, and/or the second number of times is greater than or equal to the second target number of times, it is determined that there is a cylinder in the engine Combustion abnormality.

Optionally, after it is determined that there is an abnormal combustion condition in the cylinder of the engine, the method further includes: sending out pre-warning prompt information, wherein the pre-warning prompt information is used to indicate that there is an abnormal combustion condition in the cylinder of the engine.

Optionally, the first preset value, the second preset value, the third preset value and the fourth preset value are all determined by the rotational speed of the engine and the required torque of the engine.

According to another aspect of the present application, a diagnosing device for abnormal combustion of an engine is provided. The device includes: a calculation unit for calculating the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculating the exhaust gas temperature after the ignition preset time; a first judgment unit for judging whether the rate of change of the exhaust gas temperature is less than is equal to the first preset value, and judges whether the exhaust gas temperature is less than or equal to the second preset value; the first determination unit is used to determine whether the change rate of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to In the case of the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine; the second judgment unit is used for the case where the change rate of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value Next, determine whether the exhaust gas temperature change rate is less than or equal to the third preset value, and determine whether the exhaust temperature is less than or equal to the fourth preset value; the adjustment unit is used for when the exhaust gas temperature change rate is greater than the first preset value and less than is equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition advance angle and ignition power-on time in the cylinder, and adjust the ignition advance angle and ignition power-on time in the cylinder according to the adjusted The rate of change of the exhaust gas temperature and the exhaust gas temperature are used to determine whether there is a combustion abnormality in the cylinder of the engine.

In order to achieve the above object, according to another aspect of the present application, a storage medium is provided, the storage medium includes a stored program, wherein the program executes any one of the above-mentioned methods for diagnosing abnormal combustion of an engine.

In order to achieve the above object, according to another aspect of the present application, there is provided a processor for running a program, wherein any one of the above-mentioned methods for diagnosing abnormal combustion of an engine is executed when the program is running.

Through the present application, the following steps are adopted: calculating the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculating the exhaust gas temperature after the ignition preset time; judging whether the rate of change of the exhaust gas temperature is less than or equal to a first preset value, and Judging whether the exhaust gas temperature is less than or equal to the second preset value; in the case that the rate of change of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to the second preset value, it is determined that the cylinder of the engine exists Combustion abnormality; when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, determine whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and determine whether the exhaust gas temperature Whether it is less than or equal to the fourth preset value; when the exhaust gas temperature change rate is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value Under the circumstance, the ignition advance angle and ignition power-on time in the cylinder are adjusted, and whether there is a combustion abnormality in the cylinder of the engine is determined according to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature, which solves the difficulty in the related art. Accurately determine whether there is a problem of abnormal combustion in the cylinder of the engine. Real-time diagnosis of the combustion condition of the engine cylinder and optimization of ignition control are carried out through the rate of change of the exhaust gas temperature and the exhaust gas temperature, thereby achieving the effect of accurately judging whether there is abnormal combustion in the engine cylinder.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a flowchart of a method for diagnosing abnormal combustion of an engine provided according to an embodiment of the present application;

FIG. 2 is a flowchart of another method for diagnosing abnormal combustion of an engine provided according to an embodiment of the present application; and

FIG. 3 is a schematic diagram of an apparatus for diagnosing abnormal combustion of an engine provided according to an embodiment of the present application.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

For the convenience of description, some nouns or terms involved in the embodiments of the present application are described below:

MAP: Two-dimensional array, input X, Y, get the corresponding output Z.

CURVE: One-dimensional array, input X, get the corresponding output Y.

According to an embodiment of the present application, a method for diagnosing abnormal combustion of an engine is provided.

FIG. 1 is a flowchart of a method for diagnosing abnormal combustion of an engine according to an embodiment of the present application. As shown in Figure 1, the method includes the following steps:

Step S101: Calculate the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculate the exhaust gas temperature after the ignition preset time.

It should be noted that, taking a large-bore gas engine as an example, after the ignition coil starts to ignite in each cylinder, under normal circumstances, the combustibles in the cylinder begin to burn to release heat, and the exhaust gas temperature rises. The rate of increase, that is, the rate of change of the exhaust gas temperature, is constant. The combustion situation of the current cylinder can be diagnosed by calculating the rate of change of the exhaust gas temperature after each cylinder starts to ignite and the value of the exhaust gas temperature after the preset time T.

Specifically, since the crankshaft running speed of the engine is different under different engine speeds, and the conditions of in-cylinder combustion are different, the preset time T can be determined based on the two-dimensional array of the engine speed and the combustion time pair.

Accurately obtaining the exhaust gas temperature is the key to accurately diagnosing the abnormal combustion. Optionally, in the method for diagnosing the abnormal combustion of the engine provided in the embodiment of the present application, the rate of change of the exhaust gas temperature after the ignition in the cylinder of the engine is calculated, and the ignition is calculated. Before the exhaust gas temperature after a preset time, the method further includes: judging whether the exhaust gas temperature sensor provided in the cylinder of the engine is faulty; in the case that the exhaust gas temperature sensor is not faulty, performing calculation after the in-cylinder ignition of the engine is the rate of change of the exhaust gas temperature, and the steps of calculating the exhaust gas temperature after the ignition preset time.

Specifically, each cylinder is currently provided with an exhaust gas temperature sensor to monitor whether the exhaust gas temperature of each cylinder exceeds the limit, and determine whether there is a fault in the exhaust gas temperature sensor, such as exhaust gas temperature reliability fault, exhaust gas temperature sensor voltage If the exhaust gas temperature sensor is faulty, repair or replace the exhaust gas temperature sensor.

Step S102, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to a first preset value, and whether the exhaust gas temperature is less than or equal to a second preset value.

Step S103, when the rate of change of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine.

It should be noted that the first preset value and the second preset value constitute the threshold value of the first gear. If the change rate of the exhaust gas temperature and the exhaust gas temperature of the current cylinder are both lower than the estimated threshold value of the first gear, it means that the There is a misfire problem in the cylinder, and a fault reminder for the cylinder misfire needs to be reported.

Step S104, in the case where the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, determine whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and determine whether the exhaust gas temperature is less than or equal to the fourth preset value.

Optionally, in the method for diagnosing engine combustion abnormality provided by the embodiment of the present application, the first preset value, the second preset value, the third preset value and the fourth preset value are all determined by the speed of the engine and the speed of the engine. Demand torque is determined.

It should be noted that the first preset value, the second preset value, the third preset value and the fourth preset value are obtained by checking the preset two-dimensional array corresponding to the engine speed and the required torque, and the first preset value can be set. The third threshold is greater than the first threshold, and the fourth threshold is greater than the second threshold.

Step S105, when the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the cylinder The ignition advance angle and ignition power-on time in the engine are determined, and whether there is a combustion abnormality in the engine cylinder is judged according to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature.

It should be noted that the first preset value and the second preset value constitute the threshold value of the first gear, and the third preset value and the fourth preset value constitute the threshold value of the second gear. If the temperature is higher than the first gear threshold but lower than the second gear threshold, it indicates that there is abnormal combustion in the cylinder. At this time, it can be observed whether the in-cylinder combustion can be improved by adjusting the ignition advance angle and ignition power-on time.

Through this embodiment, the real-time diagnosis of the combustion condition in the cylinder during the running of the engine is performed, and the control and optimization of the combustion condition in the cylinder is carried out.

Optionally, in the method for diagnosing abnormal combustion of an engine provided by the embodiment of the present application, after it is determined that there is abnormal combustion in a cylinder of the engine, the method further includes: issuing early warning prompt information, wherein the early warning prompt information is used to indicate the engine There is a combustion abnormality in the cylinder of .

Specifically, if there is an abnormal combustion condition in the cylinder of the engine, a fault reminder of abnormal combustion is reported in time, thereby reminding the staff to repair or replace the cylinder.

In the method for diagnosing abnormal engine combustion provided by the embodiments of the present application, by calculating the rate of change of the exhaust gas temperature after in-cylinder ignition of the engine, and calculating the exhaust gas temperature after the ignition preset time; it is determined whether the rate of change of the exhaust gas temperature is less than or equal to a preset value, and determine whether the exhaust gas temperature is less than or equal to the second preset value; when the rate of change of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to the second preset value, It is determined that there is a combustion abnormality in the cylinder of the engine; when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value , and determine whether the exhaust gas temperature is less than or equal to the fourth preset value; when the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than When it is equal to the fourth preset value, adjust the ignition advance angle and ignition power-on time in the cylinder, and judge whether there is abnormal combustion in the cylinder of the engine according to the change rate of the exhaust temperature in the cylinder and the exhaust temperature after adjustment, The problem in the related art that it is difficult to accurately judge whether there is abnormal combustion in the cylinder of the engine is solved. Real-time diagnosis of the combustion condition of the engine cylinder and optimization of ignition control are carried out through the rate of change of the exhaust gas temperature and the exhaust gas temperature, thereby achieving the effect of accurately judging whether there is abnormal combustion in the engine cylinder.

Optionally, in the method for diagnosing abnormal engine combustion provided by the embodiment of the present application, when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined that the exhaust gas temperature changes. After determining whether the exhaust gas temperature is less than or equal to the third preset value, and judging whether the exhaust gas temperature is less than or equal to the fourth preset value, the method further includes: when the rate of change of the exhaust gas temperature is greater than the third preset value, and the exhaust gas temperature is greater than the fourth preset value In the case of the preset value, it is determined that the in-cylinder of the engine is in a normal combustion state.

Specifically, the third preset value and the fourth preset value constitute the threshold value of the second gear. If the exhaust gas temperature change rate and the exhaust gas temperature are higher than the second gear threshold value, it means that the combustion of the cylinder is normal.

Optionally, in the method for diagnosing abnormal engine combustion provided by the embodiments of the present application, when the exhaust gas temperature change rate is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value. When the set value is less than or equal to the fourth preset value, adjusting the ignition advance angle and ignition power-on time in the cylinder includes: determining the ignition advance angle correction value according to the change rate of the exhaust gas temperature and the exhaust gas temperature; On the basis of the ignition advance angle correction value, the adjusted ignition advance angle is obtained; the ignition power-on time correction value is determined according to the change rate of the exhaust gas temperature and the exhaust gas temperature; on the basis of the current ignition and power-on time, the ignition power-on time is added. Electric time correction value to get the adjusted ignition power-up time.

It should be noted that if the rate of change of the exhaust gas temperature and the exhaust gas temperature are higher than the first gear threshold but lower than the second gear threshold, it means that there is abnormal combustion in the cylinder, and the current ignition advance angle and the current ignition power-on time are carried out. Correction and observe whether the in-cylinder combustion can be improved after correction.

Specifically, the ignition advance angle is equivalent to the angle before the compression top dead center. For example, if the ignition advance angle is 15 degrees, it means that the ignition timing is 15 degrees before the compression top dead center. The corresponding ignition advance time can be determined by the engine speed and crankshaft speed. Calculated, and the ignition power-up time is the time that the ignition is sustained.

Optionally, in the method for diagnosing abnormal combustion of an engine provided by the embodiment of the present application, judging whether there is abnormal combustion in the cylinder of the engine according to the rate of change of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature includes: The ignition advance angle and the adjusted ignition power-on time control the combustion in the cylinder; in the preset number of combustion cycles in the cylinder, the rate of change of the exhaust gas temperature and the exhaust gas temperature are obtained respectively; Whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and determine whether the exhaust gas temperature obtained in each combustion cycle is less than or equal to the fourth preset value; in the preset number of combustion cycles, obtain the change of the exhaust gas temperature The first number of times is obtained when the rate is less than or equal to the third preset value, and the second number of times is obtained when the exhaust gas temperature is less than or equal to the fourth preset value; and determine whether the second number of times is greater than or equal to the second target number of times, wherein both the first and second target times are less than or equal to the preset number of times; when the first number of times is greater than or equal to the first target number of times, and/or the second When equal to the second target number of times, it is determined that there is a combustion abnormality in the cylinder of the engine.

Specifically, a working cycle includes the processes of intake, compression, combustion, and exhaust. Through this embodiment, the ignition advance angle and ignition power-on time are statistically adjusted for a certain number of working cycles. The rate of change of exhaust gas temperature and the difference between exhaust gas temperature and The relationship between the threshold values is used to further determine whether the cylinder has abnormal combustion problems.

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be executed in a computer system, such as a set of computer-executable instructions, and, although a logical sequence is shown in the flowcharts, in some cases, Steps shown or described may be performed in an order different from that herein.

FIG. 2 is a flowchart of another method for diagnosing engine combustion abnormality according to an embodiment of the present application. As shown in Figure 2, the method includes:

Obtain parameters such as engine speed, exhaust temperature of each cylinder, ignition advance angle of each cylinder, required torque, and exhaust temperature sensor fault status, and take any cylinder of the engine as an example to determine whether the exhaust temperature sensor of this cylinder is faulty, specifically, the exhaust temperature sensor Relevant faults include exhaust temperature reliability faults, exhaust temperature sensor voltage related faults, etc. In the absence of faults, calculate the exhaust temperature change rate after the ignition time of the cylinder and the exhaust temperature after a certain time T. The operating speed of the engine crankshaft is different under the rotation speed, and the combustion conditions in the cylinder are different. The preset time T can be determined based on the two-dimensional array of the engine rotation speed and the combustion time pair.

Determine whether the rate of change of the exhaust temperature is less than or equal to the preset threshold 1 and (or) whether the exhaust temperature is less than or equal to the preset threshold 2, in the case of no, determine whether the rate of change of the exhaust temperature is less than or equal to the preset threshold 3 and (or) the exhaust temperature Whether it is less than or equal to the preset threshold 4, in the case of yes, the ignition control enable state is set, and the ignition advance angle and ignition power-on time are adjusted. It should be noted that Threshold 1, Threshold 2, Threshold 3 and Threshold 4 are obtained by checking the preset MAP corresponding to the engine speed and required torque. Generally, Threshold 3 is greater than Threshold 1, and Threshold 4 is greater than Threshold 2.

Specifically, when adjusting the ignition advance angle and ignition power-on time, on the one hand, the ignition advance angle correction value of the cylinder is obtained by checking the corresponding preset MAP according to the exhaust temperature and the exhaust temperature change rate; Check the preset MAP corresponding to the temperature and exhaust temperature change rate to obtain the correction value of the ignition and power-on time of the cylinder. That is, the finally executed ignition advance angle and ignition power-on time are equal to the normal ignition advance angle and power-on time plus the above-mentioned corresponding correction values, respectively.

After adjusting the ignition advance angle and ignition power-on time, count the number of times m that the exhaust temperature change rate is less than or equal to the threshold 3 and (or) the exhaust temperature is less than or equal to the threshold 4 within n working cycles after the ignition control is enabled, and the number of judgments Whether m is greater than or equal to the preset threshold 5, it reports that the cylinder has abnormal combustion fault, and reminds the maintenance. Among them, n, m and the threshold value 5 are the calibration values, and the calibration and application personnel can give reasonable values according to the actual application.

Through this embodiment, real-time diagnosis and early warning of the combustion conditions of each cylinder of the engine can be performed, and appropriate ignition control optimization can be performed to effectively determine the combustion conditions of each cylinder of the engine, such as misfire and abnormal combustion (slight misfire).

Embodiments of the present application also provide a device for diagnosing abnormal engine combustion. It should be noted that the device for diagnosing abnormal engine combustion in the embodiments of the present application can be used to perform the diagnosis for abnormal engine combustion provided by the embodiments of the present application. method. The following describes the diagnosing device for abnormal combustion of an engine provided by the embodiments of the present application.

3 is a schematic diagram of an apparatus for diagnosing abnormal combustion of an engine according to an embodiment of the present application. As shown in FIG. 3 , the apparatus includes: a calculation unit 10 , a first determination unit 20 , a first determination unit 30 , a second determination unit 40 and an adjustment unit 50 .

Specifically, the calculation unit 10 is configured to calculate the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculate the exhaust gas temperature after the ignition preset time.

The first judging unit 20 is configured to judge whether the change rate of the exhaust gas temperature is less than or equal to a first preset value, and to judge whether the exhaust gas temperature is less than or equal to a second preset value.

The first determining unit 30 is configured to determine that there is a combustion abnormality in a cylinder of the engine when the rate of change of the exhaust gas temperature is less than or equal to a first preset value, and/or the exhaust gas temperature is less than or equal to a second preset value.

The second determination unit 40 is configured to determine whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, and It is determined whether the exhaust gas temperature is less than or equal to a fourth preset value.

The adjustment unit 50 is configured to be used when the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value , adjust the ignition advance angle and ignition power-on time in the cylinder, and judge whether there is abnormal combustion in the cylinder of the engine according to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature.

In the apparatus for diagnosing abnormal combustion of an engine provided by the embodiment of the present application, the calculation unit 10 calculates the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculates the exhaust gas temperature after the ignition preset time; the first judgment unit 20 judges the exhaust gas temperature. Whether the change rate of the air temperature is less than or equal to the first preset value, and determine whether the exhaust gas temperature is less than or equal to the second preset value; the first determining unit 30 determines whether the change rate of the exhaust gas temperature is less than or equal to the first preset value, and/or the exhaust gas temperature When the gas temperature is less than or equal to the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine; the second determination unit 40 is when the exhaust gas temperature change rate is greater than the first preset value and the exhaust gas temperature is greater than the second preset value. In the case of , determine whether the exhaust gas temperature change rate is less than or equal to the third preset value, and determine whether the exhaust temperature is less than or equal to the fourth preset value; the adjustment unit 50 when the exhaust temperature change rate is greater than the first preset value and less than is equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition advance angle and ignition power-on time in the cylinder, and adjust the ignition advance angle and ignition power-on time in the cylinder according to the adjusted The exhaust gas temperature change rate and exhaust temperature can judge whether there is abnormal combustion in the cylinder of the engine, which solves the problem that it is difficult to accurately judge whether there is abnormal combustion in the cylinder of the engine in the related art. The temperature is used to diagnose the combustion condition of the engine cylinder in real time and optimize the ignition control, thereby achieving the effect of accurately judging whether there is abnormal combustion in the engine cylinder.

Optionally, in the apparatus for diagnosing abnormal combustion of an engine provided by the embodiment of the present application, the apparatus further includes: a second determination unit, used for when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second In the case of the preset value, it is determined whether the exhaust gas temperature change rate is less than or equal to the third preset value, and after determining whether the exhaust gas temperature is less than or equal to the fourth preset value, when the exhaust gas temperature change rate is greater than the third preset value, And when the exhaust gas temperature is greater than the fourth preset value, it is determined that the in-cylinder of the engine is in a normal combustion state.

Optionally, in the apparatus for diagnosing abnormal combustion of an engine provided in the embodiment of the present application, the apparatus further includes: a third judgment unit, configured to calculate the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine is ignited, and calculate the ignition pre-condition. Before setting the exhaust gas temperature after the time, determine whether the exhaust gas temperature sensor set in the cylinder of the engine is faulty; the execution unit is used to execute the calculation of the exhaust gas temperature sensor after the in-cylinder ignition of the engine when there is no fault in the exhaust gas temperature sensor. The rate of change of the exhaust gas temperature and the step of calculating the exhaust gas temperature after the ignition preset time.

Optionally, in the apparatus for diagnosing abnormal engine combustion provided in the embodiment of the present application, the adjustment unit 50 includes: a first determination module, configured to determine a correction value of the ignition advance angle according to the change rate of the exhaust gas temperature and the exhaust gas temperature; The correction module is used to add the correction value of the ignition advance angle on the basis of the current ignition advance angle to obtain the adjusted ignition advance angle; the second determination module is used to determine the ignition and power-on according to the change rate of the exhaust gas temperature and the exhaust gas temperature Time correction value; the second correction module is used to add the correction value of the ignition and power-on time on the basis of the current ignition and power-on time to obtain the adjusted ignition and power-on time.

Optionally, in the apparatus for diagnosing abnormal combustion of the engine provided in the embodiment of the present application, the adjustment unit 50 further includes: a control module, configured to control the combustion in the cylinder based on the adjusted ignition advance angle and the adjusted ignition power-on time. ; The first acquisition module is used to respectively acquire the rate of change of exhaust gas temperature and the exhaust gas temperature in a preset number of combustion cycles in the cylinder; the first determination module is used to determine the exhaust gas obtained in each combustion cycle Whether the temperature change rate is less than or equal to the third preset value, and determine whether the exhaust gas temperature obtained in each combustion cycle is less than or equal to the fourth preset value; the second obtaining module is used for the preset number of combustion cycles, Obtain the number of times that the rate of change of the exhaust gas temperature is less than or equal to the third preset value to obtain the first number of times, and obtain the number of times that the exhaust gas temperature is less than or equal to the fourth preset value to obtain the second number of times; the second judgment module is used for judging Whether the first number of times is greater than or equal to the first target number of times, and determine whether the second number of times is greater than or equal to the second target number of times, where both the first and second target times are less than or equal to the preset number of times; a third determination module, used for When the first number of times is greater than or equal to the first target number of times, and/or the second number of times is greater than or equal to the second target number of times, it is determined that there is a combustion abnormality in the cylinder of the engine.

Optionally, in the apparatus for diagnosing abnormal combustion of an engine provided by the embodiment of the present application, the apparatus further includes: a prompt unit, configured to issue an early warning prompt message after it is determined that there is an abnormal combustion condition in a cylinder of the engine, wherein the early warning prompt The information is used to indicate that there is a combustion abnormality in the engine's cylinders.

Optionally, in the apparatus for diagnosing abnormal engine combustion provided by the embodiment of the present application, the first preset value, the second preset value, the third preset value and the fourth preset value are all determined by the speed of the engine and the speed of the engine. Demand torque is determined.

The diagnosing device for abnormal combustion of the engine includes a processor and a memory, and the above-mentioned calculation unit 10, the first judgment unit 20, the first determination unit 30, the second judgment unit 40 and the adjustment unit 50 are all stored in the memory as program units, The corresponding functions are implemented by the processor executing the above-mentioned program elements stored in the memory.

The processor includes a kernel, and the kernel calls the corresponding program unit from the memory. One or more cores can be set, and the problem in the related art that it is difficult to accurately judge whether there is abnormal combustion in the cylinder of the engine can be solved by adjusting the parameters of the core.

Memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory, such as read only memory (ROM) or flash memory (flash RAM), the memory including at least one memory chip.

An embodiment of the present invention provides a storage medium on which a program is stored, and when the program is executed by a processor, the method for diagnosing the abnormal combustion of the engine is implemented.

An embodiment of the present invention provides a processor for running a program, wherein a method for diagnosing abnormal combustion of the engine is executed when the program is running.

An embodiment of the present invention provides a device. The device includes a processor, a memory, and a program stored in the memory and running on the processor. When the processor executes the program, the following steps are implemented: calculating the exhaust gas after the in-cylinder ignition of the engine is performed. temperature change rate, and calculate the exhaust gas temperature after the ignition preset time; determine whether the exhaust gas temperature change rate is less than or equal to the first preset value, and determine whether the exhaust gas temperature is less than or equal to the second preset value; when the exhaust gas temperature changes When the rate of change is less than or equal to the first preset value, and/or the exhaust gas temperature is less than or equal to the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine; When the air temperature is greater than the second preset value, it is determined whether the change rate of the exhaust temperature is less than or equal to the third preset value, and whether the exhaust temperature is less than or equal to the fourth preset value; when the change rate of the exhaust temperature is greater than the first preset value When the preset value is less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition advance angle and ignition power-on time in the cylinder, and According to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature, it is determined whether there is a combustion abnormality in the cylinder of the engine.

When the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and whether the exhaust gas temperature is less than or equal to the third preset value is determined. After four preset values, the method further includes: determining that the in-cylinder of the engine is in a normal combustion state when the rate of change of the exhaust gas temperature is greater than the third preset value and the exhaust gas temperature is greater than the fourth preset value.

Before calculating the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine and calculating the exhaust gas temperature after the ignition preset time, the method further includes: judging whether the exhaust gas temperature sensor provided in the engine cylinder is faulty; When the air temperature sensor is not faulty, the steps of calculating the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine and calculating the exhaust gas temperature after the ignition preset time are performed.

When the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition in the cylinder The advance angle and ignition power-on time include: determining the ignition advance angle correction value according to the change rate of the exhaust gas temperature and the exhaust gas temperature; adding the ignition advance angle correction value on the basis of the current ignition advance angle to obtain the adjusted ignition advance angle; The ignition and power-on time correction value is determined according to the change rate of the exhaust gas temperature and the exhaust gas temperature; the adjusted ignition and power-on time is obtained by adding the ignition and power-on time correction value on the basis of the current ignition and power-on time.

Judging whether there is a combustion abnormality in the cylinder of the engine according to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature include: controlling the combustion in the cylinder based on the adjusted ignition advance angle and the adjusted ignition power-on time; In the preset number of combustion cycles within the range, the rate of change of exhaust gas temperature and the exhaust gas temperature are obtained respectively; it is judged whether the rate of change of exhaust gas temperature obtained in each combustion cycle is less than or equal to the third preset value, and the Whether the exhaust gas temperature obtained in the combustion cycle is less than or equal to the fourth preset value; in the preset number of combustion cycles, obtain the number of times the exhaust gas temperature change rate is less than or equal to the third preset value, obtain the first number, and obtain the The number of times that the exhaust gas temperature is less than or equal to the fourth preset value, the second number of times is obtained; whether the first number of times is greater than or equal to the first target number of times, and whether the second number of times is greater than or equal to the second target number of times, where the first target number of times and the second target number of times are both less than or equal to the preset number of times; when the first number of times is greater than or equal to the first target number of times, and/or the second number of times is greater than or equal to the second target number of times, it is determined that there is a combustion abnormality in the cylinder of the engine.

After it is determined that there is an abnormal combustion condition in the cylinder of the engine, the method further includes: issuing early warning prompt information, wherein the early warning prompt information is used to indicate that there is an abnormal combustion condition in the cylinder of the engine.

The first preset value, the second preset value, the third preset value and the fourth preset value are all determined by the rotational speed of the engine and the required torque of the engine. The devices in this article can be servers, PCs, PADs, mobile phones, and so on.

The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program initialized with the following method steps: calculating the rate of change of the exhaust gas temperature after the in-cylinder ignition of the engine, and calculating the ignition preset Exhaust temperature after time; determine whether the rate of change of exhaust temperature is less than or equal to the first preset value, and determine whether the exhaust temperature is less than or equal to the second preset value; when the rate of change of exhaust temperature is less than or equal to the first preset value, and/or when the exhaust gas temperature is less than or equal to the second preset value, it is determined that there is a combustion abnormality in the cylinder of the engine; when the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value In this case, determine whether the exhaust gas temperature change rate is less than or equal to the third preset value, and determine whether the exhaust temperature is less than or equal to the fourth preset value; when the exhaust gas temperature change rate is greater than the first preset value and less than or equal to the third preset value set value, and/or when the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition advance angle and ignition power-on time in the cylinder, and adjust the exhaust gas temperature in the cylinder after adjustment. The rate of change and the exhaust gas temperature determine whether there is a combustion abnormality in the cylinder of the engine.

When the rate of change of the exhaust gas temperature is greater than the first preset value and the exhaust gas temperature is greater than the second preset value, it is determined whether the rate of change of the exhaust gas temperature is less than or equal to the third preset value, and whether the exhaust gas temperature is less than or equal to the third preset value is determined. After four preset values, the method further includes: determining that the in-cylinder of the engine is in a normal combustion state when the rate of change of the exhaust gas temperature is greater than the third preset value and the exhaust gas temperature is greater than the fourth preset value.

Before calculating the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine and calculating the exhaust gas temperature after the ignition preset time, the method further includes: judging whether the exhaust gas temperature sensor provided in the engine cylinder is faulty; When the air temperature sensor is not faulty, the steps of calculating the change rate of the exhaust gas temperature after the in-cylinder ignition of the engine and calculating the exhaust gas temperature after the ignition preset time are performed.

When the rate of change of the exhaust gas temperature is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust gas temperature is greater than the second preset value and less than or equal to the fourth preset value, adjust the ignition in the cylinder The advance angle and ignition power-on time include: determining the ignition advance angle correction value according to the change rate of the exhaust gas temperature and the exhaust gas temperature; adding the ignition advance angle correction value on the basis of the current ignition advance angle to obtain the adjusted ignition advance angle; The ignition and power-on time correction value is determined according to the change rate of the exhaust gas temperature and the exhaust gas temperature; the adjusted ignition and power-on time is obtained by adding the ignition and power-on time correction value on the basis of the current ignition and power-on time.

Judging whether there is a combustion abnormality in the cylinder of the engine according to the change rate of the exhaust gas temperature in the cylinder after adjustment and the exhaust gas temperature include: controlling the combustion in the cylinder based on the adjusted ignition advance angle and the adjusted ignition power-on time; In the preset number of combustion cycles within the range, the rate of change of exhaust gas temperature and the exhaust gas temperature are obtained respectively; it is judged whether the rate of change of exhaust gas temperature obtained in each combustion cycle is less than or equal to the third preset value, and the Whether the exhaust gas temperature obtained in the combustion cycle is less than or equal to the fourth preset value; in the preset number of combustion cycles, obtain the number of times the exhaust gas temperature change rate is less than or equal to the third preset value, obtain the first number, and obtain the The number of times that the exhaust gas temperature is less than or equal to the fourth preset value, the second number of times is obtained; whether the first number of times is greater than or equal to the first target number of times, and whether the second number of times is greater than or equal to the second target number of times, where the first target number of times and the second target number of times are both less than or equal to the preset number of times; when the first number of times is greater than or equal to the first target number of times, and/or the second number of times is greater than or equal to the second target number of times, it is determined that there is a combustion abnormality in the cylinder of the engine.

After it is determined that there is an abnormal combustion condition in the cylinder of the engine, the method further includes: issuing early warning prompt information, wherein the early warning prompt information is used to indicate that there is an abnormal combustion condition in the cylinder of the engine.

The first preset value, the second preset value, the third preset value and the fourth preset value are all determined by the rotational speed of the engine and the required torque of the engine.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory in the form of, for example, read only memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media includes both persistent and non-permanent, removable and non-removable media, and storage of information may be implemented by any method or technology. Information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory or other memory technology, Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those elements, but also Other elements not expressly listed, or which are inherent to such a process, method, article of manufacture, or apparatus are also included. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture or apparatus that includes the element.

It will be appreciated by those skilled in the art that the embodiments of the present application may be provided as a method, a system or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above are merely examples of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims (10)

1. A method of diagnosing an engine combustion abnormality, characterized by comprising:

calculating the exhaust temperature change rate after ignition in a cylinder of the engine, and calculating the exhaust temperature after ignition for a preset time;

judging whether the exhaust temperature change rate is less than or equal to a first preset value or not, and judging whether the exhaust temperature is less than or equal to a second preset value or not;

determining that a combustion abnormal condition exists in a cylinder of the engine under the condition that the exhaust temperature change rate is smaller than or equal to the first preset value and/or the exhaust temperature is smaller than or equal to the second preset value;

under the condition that the exhaust temperature change rate is greater than the first preset value and the exhaust temperature is greater than the second preset value, judging whether the exhaust temperature change rate is less than or equal to a third preset value and judging whether the exhaust temperature is less than or equal to a fourth preset value;

and under the condition that the exhaust temperature change rate is greater than the first preset value and less than or equal to the third preset value, and/or the exhaust temperature is greater than the second preset value and less than or equal to the fourth preset value, adjusting the ignition advance angle and the ignition power-on time in the cylinder, and judging whether the combustion abnormal condition exists in the cylinder of the engine according to the adjusted exhaust temperature change rate and the adjusted exhaust temperature in the cylinder.

2. The method according to claim 1, wherein, in a case where the exhaust temperature change rate is greater than the first preset value and the exhaust temperature is greater than the second preset value, after determining whether the exhaust temperature change rate is equal to or less than a third preset value and determining whether the exhaust temperature is equal to or less than a fourth preset value, the method further comprises:

and under the condition that the exhaust gas temperature change rate is greater than the third preset value and the exhaust gas temperature is greater than the fourth preset value, determining that the cylinder of the engine is in a normal combustion state.

3. The method of claim 1, wherein prior to calculating a rate of change of an exhaust temperature after in-cylinder ignition of an engine and calculating an exhaust temperature after a preset time of ignition, the method further comprises:

judging whether an exhaust temperature sensor arranged in a cylinder of the engine has a fault or not;

and calculating a change rate of an exhaust gas temperature after ignition in a cylinder of the engine and calculating an exhaust gas temperature after a preset time of ignition, in a case where the exhaust gas temperature sensor has no failure.

4. The method according to claim 1, wherein in the case where the exhaust gas temperature change rate is greater than the first preset value and equal to or less than the third preset value, and/or the exhaust gas temperature is greater than the second preset value and equal to or less than the fourth preset value, adjusting the in-cylinder spark advance angle and the spark energization time comprises:

determining a corrected ignition advance angle value according to the exhaust temperature change rate and the exhaust temperature;

adding the ignition advance correction value on the basis of the current ignition advance to obtain an adjusted ignition advance;

determining an ignition power-on time correction value according to the exhaust temperature change rate and the exhaust temperature;

and adding the ignition power-on time correction value on the basis of the current ignition power-on time to obtain the adjusted ignition power-on time.

5. The method of claim 4, wherein determining whether a combustion anomaly condition exists in a cylinder of the engine based on the exhaust gas temperature and the rate of change of the exhaust gas temperature in the cylinder after the adjusting comprises:

controlling combustion in the cylinder based on the adjusted spark advance and the adjusted spark on-time;

respectively acquiring an exhaust temperature change rate and an exhaust temperature in preset times of combustion cycles in the cylinder;

judging whether the exhaust gas temperature change rate obtained in each combustion cycle is less than or equal to the third preset value or not, and judging whether the exhaust gas temperature obtained in each combustion cycle is less than or equal to the fourth preset value or not;

in the preset times of combustion cycles, acquiring times that the exhaust temperature change rate is smaller than or equal to a third preset value to obtain a first time, and acquiring times that the exhaust temperature is smaller than or equal to a fourth preset value to obtain a second time;

judging whether the first times are more than or equal to a first target time, and judging whether the second times are more than or equal to a second target time, wherein the first target time and the second target time are both less than or equal to the preset time;

and determining that the combustion abnormal condition exists in the cylinder of the engine under the condition that the first frequency is greater than or equal to a first target frequency and/or the second frequency is greater than or equal to a second target frequency.

6. The method of any one of claims 1 or 5, wherein after determining that a combustion anomaly condition exists within a cylinder of the engine, the method further comprises:

and sending early warning prompt information, wherein the early warning prompt information is used for indicating that the abnormal combustion condition exists in the cylinder of the engine.

7. The method of claim 1, wherein the first, second, third and fourth preset values are each determined by a rotational speed of an engine and a required torque of the engine.

8. An apparatus for diagnosing an engine combustion abnormality, characterized by comprising:

the calculation unit is used for calculating the exhaust temperature change rate after ignition in a cylinder of the engine and calculating the exhaust temperature after preset ignition time;

the first judgment unit is used for judging whether the exhaust temperature change rate is smaller than or equal to a first preset value or not and judging whether the exhaust temperature is smaller than or equal to a second preset value or not;

a first determination unit, configured to determine that a combustion abnormality occurs in a cylinder of the engine when the exhaust gas temperature change rate is equal to or less than the first preset value and/or the exhaust gas temperature is equal to or less than the second preset value;

a second determination unit, configured to determine whether the exhaust temperature change rate is less than or equal to a third preset value and determine whether the exhaust temperature is less than or equal to a fourth preset value, when the exhaust temperature change rate is greater than the first preset value and the exhaust temperature is greater than the second preset value;

and the adjusting unit is used for adjusting the ignition advance angle and the ignition power-on time in the cylinder under the condition that the exhaust temperature change rate is greater than the first preset value and less than or equal to the third preset value and/or the exhaust temperature is greater than the second preset value and less than or equal to the fourth preset value, and judging whether the combustion abnormal condition exists in the cylinder of the engine according to the exhaust temperature change rate and the exhaust temperature in the cylinder after adjustment.

9. A storage medium characterized by comprising a stored program, wherein the program executes the method of diagnosing an engine combustion abnormality according to any one of claims 1 to 7.

10. A processor for running a program, wherein the program is run to perform the method of diagnosing an engine combustion abnormality according to any one of claims 1 to 7.

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