Engine pre-ignition detection method and apparatus

Abstract

The embodiment of the application discloses an engine early combustion detection method and device, the method comprises the following steps: performing poor-quality oil diagnosis on a target vehicle; in the case that the poor-quality oil diagnosis result indicates that the oil in the target vehicle belongs to poor-quality oil, detecting whether early combustion occurs in the target vehicle according to the rotation speed, load, fast-retarded ignition angle and slow-retarded ignition angle of the target vehicle; in the case that the poor-quality oil diagnosis result indicates that the oil in the target vehicle does not belong to poor-quality oil, detecting whether early combustion occurs in the target vehicle according to the rotation speed, load and periodic early combustion count value of the target vehicle. In this way, timely detection of engine early combustion is realized, so that timely treatment of engine early combustion is facilitated, and engine damage caused by early combustion is avoided.

Description

Technical Field

[0001] This application relates to the field of automotive control technology, specifically to a method and apparatus for detecting engine pre-ignition. Background Technology

[0002] Pre-ignition refers to the phenomenon where the air-fuel mixture is ignited by a hot spot in the combustion chamber before the spark plug can fire, resulting in premature combustion. In practical applications, incandescent carbon deposits, protruding metal spikes, overheated spark plugs, or red-hot exhaust valves can all cause premature ignition of the mixture. Pre-ignition is usually accompanied by knocking sounds, power loss, and engine overheating. Severe pre-ignition can even lead to serious knocking.

[0003] Pre-ignition can cause significant damage to the engine, and is therefore considered the most important limiting factor for further engine reduction and strengthening. In a pre-ignition cycle, the air-fuel mixture is ignited before the spark plug sparks, resulting in much higher pressure than normal combustion. Furthermore, due to the increased pressure level and the fact that the auto-ignition point usually occurs in a space unfavorable to combustion, the combustion process is prone to turning into intense detonation, which severely damages the engine.

[0004] It is evident that timely detection of engine pre-ignition has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method and apparatus for detecting engine pre-ignition, which can self-learn the engine's pre-ignition conditions and detect engine pre-ignition in a timely manner.

[0006] In view of the above, the first aspect of this application provides a method for detecting engine pre-ignition, the method comprising:

[0007] Diagnose the problem of substandard oil in the target vehicle;

[0008] If the diagnosis of substandard oil indicates that the oil in the target vehicle is substandard, the vehicle is tested for pre-ignition based on its engine speed, load, fast rewind ignition angle, and slow rewind ignition angle.

[0009] If the diagnostic results for substandard oil indicate that the oil in the target vehicle is not substandard, the vehicle is tested for pre-ignition based on its engine speed, load, and pre-ignition count.

[0010] Optionally, the process of diagnosing substandard oil in the target vehicle includes:

[0011] When the target vehicle's rotational speed is within a preset speed range and the target vehicle's load is within a preset load range, the slow rewind ignition angle fault range and the fast rewind ignition angle fault range are obtained.

[0012] For each cylinder of the target vehicle, it is detected whether its slow rewind ignition angle is within the slow rewind ignition angle fault range, and whether its fast rewind ignition angle is within the fast rewind ignition angle fault range.

[0013] If the slow rewind ignition angle of any cylinder in the target vehicle is within the slow rewind ignition angle fault range, or the fast rewind ignition angle of any cylinder is within the fast rewind ignition angle fault range, then the oil in the target vehicle is determined to be inferior oil.

[0014] Optionally, detecting whether pre-ignition occurs in the target vehicle based on its engine speed, load, fast rewind ignition angle, and slow rewind ignition angle includes:

[0015] If the target vehicle's rotational speed is greater than a first rotational speed threshold, the target vehicle's load is greater than a first load threshold, the fast retraction ignition angle is greater than a preset fast retraction ignition angle threshold, and the slow retraction ignition angle is greater than a preset slow retraction ignition angle threshold, then it is determined that the target vehicle has pre-ignition.

[0016] Optionally, detecting whether the target vehicle has pre-ignition based on its rotational speed, load, and periodic pre-ignition count includes:

[0017] If the target vehicle's rotational speed is greater than the second rotational speed threshold, the target vehicle's load is greater than the second load threshold, and the periodic pre-ignition count value is greater than the pre-designed numerical threshold, then the target vehicle is determined to have pre-ignited. If pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value is directly increased by a preset increment. If no pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value decreases linearly.

[0018] Optionally, the method further includes:

[0019] If it is determined that the target vehicle is experiencing pre-ignition, at least one of the following pre-ignition treatment operations shall be performed: regional enrichment, reduction of variable valve timing (VVT), torque limitation, and discontinuation of scavenging.

[0020] Optionally, the method further includes:

[0021] Once the pre-ignition flag is detected indicating the end of pre-ignition, the pre-ignition processing operation is stopped.

[0022] A second aspect of this application provides an engine pre-ignition detection device, the device comprising:

[0023] The substandard oil diagnostic module is used to diagnose substandard oil in target vehicles.

[0024] The first pre-ignition detection module is used to detect whether pre-ignition has occurred in the target vehicle when the inferior oil diagnosis result indicates that the oil in the target vehicle is inferior oil, based on the target vehicle's speed, load, fast rewind ignition angle and slow rewind ignition angle.

[0025] The second pre-ignition detection module is used to detect whether pre-ignition has occurred in the target vehicle, based on the target vehicle's speed, load, and periodic pre-ignition count value, when the inferior oil diagnosis result indicates that the oil in the target vehicle is not inferior oil.

[0026] Optionally, the substandard oil diagnostic module is specifically used for:

[0027] When the target vehicle's rotational speed is within a preset speed range and the target vehicle's load is within a preset load range, the slow rewind ignition angle fault range and the fast rewind ignition angle fault range are obtained.

[0028] For each cylinder of the target vehicle, it is detected whether its slow rewind ignition angle is within the slow rewind ignition angle fault range, and whether its fast rewind ignition angle is within the fast rewind ignition angle fault range.

[0029] If the slow rewind ignition angle of any cylinder in the target vehicle is within the slow rewind ignition angle fault range, or the fast rewind ignition angle of any cylinder is within the fast rewind ignition angle fault range, then the oil in the target vehicle is determined to be inferior oil.

[0030] Optionally, the first pre-ignition detection module is specifically used for:

[0031] If the target vehicle's rotational speed is greater than a first rotational speed threshold, the target vehicle's load is greater than a first load threshold, the fast retraction ignition angle is greater than a preset fast retraction ignition angle threshold, and the slow retraction ignition angle is greater than a preset slow retraction ignition angle threshold, then it is determined that the target vehicle has pre-ignition.

[0032] Optionally, the second pre-ignition detection module is specifically used for:

[0033] If the target vehicle's rotational speed is greater than the second rotational speed threshold, the target vehicle's load is greater than the second load threshold, and the periodic pre-ignition count value is greater than the pre-designed numerical threshold, then the target vehicle is determined to have pre-ignited. If pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value is directly increased by a preset increment. If no pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value decreases linearly.

[0034] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0035] This application provides a method for detecting engine pre-ignition. The method includes: performing a defective oil diagnosis on a target vehicle; if the defective oil diagnosis indicates that the oil in the target vehicle is defective, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, fast retraction ignition angle, and slow retraction ignition angle; if the defective oil diagnosis indicates that the oil in the target vehicle is not defective, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, and periodic pre-ignition count value. Thus, by using different methods to detect engine pre-ignition under two different conditions—defective oil and non-defective oil—it achieves timely detection of engine pre-ignition, thereby facilitating timely handling of engine pre-ignition and preventing engine damage caused by pre-ignition. Attached Figure Description

[0036] Figure 1 A schematic flowchart of the engine pre-ignition detection method provided in the embodiments of this application;

[0037] Figure 2 A schematic diagram illustrating the variation trend of the periodic pre-ignition count value provided for embodiments of this application;

[0038] Figure 3 A schematic diagram illustrating the identification of a concentrated region provided in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the engine pre-ignition detection device provided in an embodiment of this application. Detailed Implementation

[0040] To enable those skilled in the art to better understand 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. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0041] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] See Figure 1 , Figure 1 This is a schematic flowchart illustrating the engine pre-ignition detection method provided in an embodiment of this application. This method is typically executed by the vehicle controller, such as... Figure 1 As shown, the engine pre-ignition detection method includes the following steps:

[0043] Step 101: Diagnose the inferior oil quality of the target vehicle.

[0044] In this embodiment of the application, before detecting whether the engine of the target vehicle is experiencing pre-ignition, it is necessary to first diagnose whether the engine oil (such as gasoline, diesel, etc.) added to the target vehicle is of inferior quality; then, based on the diagnosis result of the inferior oil, the detection mechanism used to detect whether the engine is experiencing pre-ignition is determined.

[0045] In one possible implementation, the defective oil diagnosis for a target vehicle can be performed as follows: When the target vehicle's engine speed is within a preset speed range and its load is within a preset load range, the slow rewind ignition angle fault range and the fast rewind ignition angle fault range are obtained; for each cylinder of the target vehicle, it is detected whether its slow rewind ignition angle is within the slow rewind ignition angle fault range, and whether its fast rewind ignition angle is within the fast rewind ignition angle fault range; if the slow rewind ignition angles of all cylinders of the target vehicle are within the slow rewind ignition angle fault range, or the fast rewind ignition angles are all within the fast rewind ignition angle fault range, then it is determined that the oil in the target vehicle is defective oil.

[0046] For example, the diagnostic operation for substandard oil needs to be performed when the vehicle's engine speed is within a preset speed range and the vehicle's load is within a preset load range. Before performing this diagnostic operation, it is necessary to look up the slow rewind ignition angle fault range and the fast rewind ignition angle fault range in a table. When the vehicle's engine speed is within the preset speed range and the vehicle's load is within the preset load range, the slow rewind ignition angle of cylinders 1, 2, 3, and 4 of the target vehicle can be checked to see if they are within the slow rewind ignition angle fault range, and the fast rewind angle of cylinders 1, 2, 3, and 4 can be checked to see if they are within the fast rewind ignition angle fault range. If the slow rewind ignition angle of any cylinder of the target vehicle is within the slow rewind ignition angle fault range, or the fast rewind ignition angle of any cylinder is within the fast rewind ignition angle fault range, it can be determined that the oil in the target vehicle is substandard oil, and a substandard oil fault warning can be issued.

[0047] Step 102: If the inferior oil diagnosis result indicates that the oil in the target vehicle is inferior oil, detect whether the target vehicle is experiencing pre-ignition based on the target vehicle's speed, load, fast rewind ignition angle, and slow rewind ignition angle.

[0048] If the inferior oil diagnostic operation in step 101 determines that the oil in the target vehicle is inferior oil, the vehicle controller can detect whether the target vehicle is experiencing pre-ignition based on the vehicle's speed, load, fast rewind ignition angle, and slow rewind ignition angle.

[0049] In one possible implementation, if the target vehicle's rotational speed is greater than a first rotational speed threshold, the target vehicle's load is greater than a first load threshold, the fast retraction ignition angle is greater than a preset fast retraction ignition angle threshold, and the slow retraction ignition angle is greater than a preset slow retraction ignition angle threshold, then it can be determined that the target vehicle has pre-ignition.

[0050] For example, if the pre-ignition detection switch of the target vehicle is turned on, and if the fuel in the target vehicle is identified as inferior fuel, and the target vehicle simultaneously meets the following conditions: the engine speed is greater than a first engine speed threshold, the load is greater than a first load threshold, the fast rewind ignition angle (which may be the average of the fast rewind angles of each cylinder) is greater than a preset fast rewind ignition angle threshold, and the slow rewind ignition angle (which may be the average of the slow rewind angles of each cylinder) is greater than a preset slow rewind ignition angle threshold, then it is determined that the target vehicle has experienced a pre-ignition.

[0051] Step 103: If the inferior oil diagnosis result indicates that the oil in the target vehicle is not inferior oil, detect whether the target vehicle is experiencing pre-ignition based on the target vehicle's speed, load, and pre-ignition count value.

[0052] If the inferior oil diagnostic operation in step 101 determines that the oil in the target vehicle is not inferior oil, the vehicle controller can detect whether the target vehicle has pre-ignition based on the target vehicle's speed, load, and pre-ignition count value.

[0053] It should be noted that the pre-ignition count value will increase sharply when pre-ignition occurs, and will decrease linearly when pre-ignition does not occur. Figure 2 The diagram illustrates an exemplary trend in the pre-ignition count value over a period. A circle indicates that a pre-ignition has occurred. After a pre-ignition occurs, the pre-ignition count value for that period increases directly by a preset increment. When no pre-ignition occurs, the pre-ignition count value for that period decreases linearly. If a pre-ignition occurs again during the decay of the pre-ignition count value for that period, the pre-ignition count value for that period will again increase directly by a preset increment.

[0054] In one possible implementation, if the target vehicle's rotational speed is greater than a second rotational speed threshold, the target vehicle's load is greater than a second load threshold, and the periodic pre-ignition count value is greater than a pre-designed numerical threshold, then it can be determined that the target vehicle has pre-ignited.

[0055] For example, if the pre-ignition detection switch of the target vehicle is turned on, and it is detected that the oil in the target vehicle is not of inferior quality, and the target vehicle simultaneously meets the following conditions: the speed is greater than the second speed threshold, the load is greater than the second load threshold, and the periodic pre-ignition count value is greater than the pre-designed value threshold, then it is determined that the target vehicle has experienced a pre-ignition.

[0056] If pre-ignition is detected in the target vehicle, at least one of the following pre-ignition treatment operations can be performed: regional enrichment, reduction of variable valve timing (VVT), torque limitation, and disengagement of scavenging.

[0057] Specifically, if the region concentration flag in the target vehicle is set to 1, region concentration processing can be performed, and the specific region to be concentrated can be automatically identified. Figure 3 The diagram illustrates one method for identifying enrichment zones. If the VVT ​​reduction flag in the target vehicle is set to 1, VVT reduction processing can be performed. If the torque limiting flag in the target vehicle is set to 1, torque limiting processing can be performed. If none of the above flags are set to 1, scavenging process can be exited.

[0058] It should be noted that if pre-ignition is detected in the target vehicle's engine, the pre-ignition flag on the target vehicle will be set to 1, indicating that pre-ignition has occurred in the target vehicle's engine. If no pre-ignition is detected in the target vehicle's engine during the next pre-ignition detection cycle, the pre-ignition flag will be set to 0, at which point the pre-ignition processing operation can be stopped.

[0059] The engine pre-ignition detection method provided in this application includes: performing a defective oil diagnosis on a target vehicle; if the defective oil diagnosis indicates that the oil in the target vehicle is defective, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, fast retraction ignition angle, and slow retraction ignition angle; if the defective oil diagnosis indicates that the oil in the target vehicle is not defective, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, and periodic pre-ignition count value. Thus, by using different methods to detect engine pre-ignition conditions under two different states—defective oil and non-defective oil—the method enables timely detection of engine pre-ignition, facilitating timely handling of pre-ignition and preventing engine damage caused by pre-ignition.

[0060] See Figure 4 , Figure 4 This is a schematic diagram of the engine pre-ignition detection device provided in an embodiment of this application. Figure 4 As shown, the engine pre-ignition detection device includes:

[0061] The substandard oil diagnostic module 401 is used to diagnose substandard oil in a target vehicle.

[0062] The first pre-ignition detection module 402 is used to detect whether pre-ignition has occurred in the target vehicle based on the target vehicle's speed, load, fast rewind ignition angle, and slow rewind ignition angle when the inferior oil diagnosis result indicates that the oil in the target vehicle is inferior oil.

[0063] The second pre-ignition detection module 403 is used to detect whether pre-ignition has occurred in the target vehicle based on the target vehicle's speed, load, and periodic pre-ignition count value, when the inferior oil diagnosis result indicates that the oil in the target vehicle is not inferior oil.

[0064] Optionally, the substandard oil diagnostic module 401 is specifically used for:

[0065] When the target vehicle's rotational speed is within a preset speed range and the target vehicle's load is within a preset load range, the slow rewind ignition angle fault range and the fast rewind ignition angle fault range are obtained.

[0066] For each cylinder of the target vehicle, it is detected whether its slow rewind ignition angle is within the slow rewind ignition angle fault range, and whether its fast rewind ignition angle is within the fast rewind ignition angle fault range.

[0067] If the slow rewind ignition angle of any cylinder in the target vehicle is within the slow rewind ignition angle fault range, or the fast rewind ignition angle of any cylinder is within the fast rewind ignition angle fault range, then the oil in the target vehicle is determined to be inferior oil.

[0068] Optionally, the first pre-ignition detection module 402 is specifically used for:

[0069] If the target vehicle's rotational speed is greater than a first rotational speed threshold, the target vehicle's load is greater than a first load threshold, the fast retraction ignition angle is greater than a preset fast retraction ignition angle threshold, and the slow retraction ignition angle is greater than a preset slow retraction ignition angle threshold, then it is determined that the target vehicle has pre-ignition.

[0070] Optionally, the second pre-ignition detection module 403 is specifically used for:

[0071] If the target vehicle's rotational speed is greater than the second rotational speed threshold, the target vehicle's load is greater than the second load threshold, and the periodic pre-ignition count value is greater than the pre-designed numerical threshold, then the target vehicle is determined to have pre-ignited. If pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value is directly increased by a preset increment. If no pre-ignition is detected within the pre-ignition detection period, the periodic pre-ignition count value decreases linearly.

[0072] Optionally, the device further includes:

[0073] The pre-ignition treatment module is used to perform at least one of the following pre-ignition treatment operations when it is determined that pre-ignition has occurred in the target vehicle: regional enrichment, reduction of variable valve timing (VVT), torque limitation, and disengagement of scavenging.

[0074] Optionally, the pre-ignition treatment module is further configured to:

[0075] Once the pre-ignition flag is detected indicating the end of pre-ignition, the pre-ignition processing operation is stopped.

[0076] The engine pre-ignition detection device provided in this application embodiment is used for: diagnosing a target vehicle with substandard oil; if the substandard oil diagnosis indicates that the oil in the target vehicle is substandard, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, fast rewind ignition angle, and slow rewind ignition angle; if the substandard oil diagnosis indicates that the oil in the target vehicle is not substandard, detecting whether pre-ignition occurs in the target vehicle based on the vehicle's engine speed, load, and periodic pre-ignition count value. Thus, by using different methods to detect engine pre-ignition under two conditions—substandard and non-substandard oil—different methods are employed to achieve timely detection of engine pre-ignition, thereby facilitating timely handling of engine pre-ignition and preventing engine damage caused by pre-ignition.

[0077] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0078] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0079] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0081] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing computer programs.

[0082] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0083] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An engine pre-ignition detection method characterized by, The method comprises: Performing poor oil diagnosis on a target vehicle; In a case where a poor oil diagnosis result indicates that oil in the target vehicle belongs to poor oil, detecting whether the target vehicle has pre-ignition according to a rotation speed, a load, a fast-retreat ignition angle and a slow-retreat ignition angle of the target vehicle; In a case where the poor oil diagnosis result indicates that the oil in the target vehicle does not belong to poor oil, detecting whether the target vehicle has pre-ignition according to the rotation speed, the load and a periodic pre-ignition count value of the target vehicle; The poor oil diagnosis on the target vehicle comprises: In a case where the rotation speed of the target vehicle is in a preset rotation speed interval and the load of the target vehicle is in a preset load interval, obtaining a slow-retreat ignition angle fault interval and a fast-retreat ignition angle fault interval; For each cylinder of the target vehicle, detecting whether the slow-retreat ignition angle of the cylinder is in the slow-retreat ignition angle fault interval and detecting whether the fast-retreat ignition angle of the cylinder is in the fast-retreat ignition angle fault interval; If the slow-retreat ignition angle of any cylinder of the target vehicle is in the slow-retreat ignition angle fault interval or the fast-retreat ignition angle of any cylinder is in the fast-retreat ignition angle fault interval, it is determined that the oil in the target vehicle belongs to poor oil; The detection of whether the target vehicle has pre-ignition according to the rotation speed, the load, the fast-retreat ignition angle and the slow-retreat ignition angle of the target vehicle comprises: If the rotation speed of the target vehicle is greater than a first rotation speed threshold, the load of the target vehicle is greater than a first load threshold, the fast-retreat ignition angle is greater than a preset fast-retreat ignition angle threshold and the slow-retreat ignition angle is greater than a preset slow-retreat ignition angle threshold, it is determined that the target vehicle has pre-ignition; The detection of whether the target vehicle has pre-ignition according to the rotation speed, the load and the periodic pre-ignition count value of the target vehicle comprises: If the rotation speed of the target vehicle is greater than a second rotation speed threshold, the load of the target vehicle is greater than a second load threshold and the periodic pre-ignition count value is greater than a preset count value threshold, it is determined that the target vehicle has pre-ignition; if pre-ignition is detected within a pre-ignition detection period, the periodic pre-ignition count value is directly increased by a preset increment, and if pre-ignition is not detected within the pre-ignition detection period, the periodic pre-ignition count value is linearly reduced.

2. The method of claim 1, wherein, The method further comprises: In a case where it is determined that the target vehicle has pre-ignition, performing at least one pre-ignition processing operation of region enrichment, variable valve timing (VVT) reduction, torque limitation and sweep air exit.

3. The method of claim 2, wherein, The method further comprises: When it is detected that a pre-ignition flag bit identifies the end of pre-ignition, stopping the execution of the pre-ignition processing operation.

4. An engine pre-ignition detection apparatus characterized by comprising: The device comprises: A poor oil diagnosis module configured to perform poor oil diagnosis on a target vehicle; A first pre-ignition detection module configured to, in a case where a poor oil diagnosis result indicates that oil in the target vehicle belongs to poor oil, detect whether the target vehicle has pre-ignition according to a rotation speed, a load, a fast-retreat ignition angle and a slow-retreat ignition angle of the target vehicle; The second early combustion detection module is configured to, in a case where the poor oil diagnosis result indicates that the oil in the target vehicle does not belong to poor oil, detect whether early combustion occurs in the target vehicle according to the rotation speed, the load and the cycle early combustion count value of the target vehicle. The poor oil diagnosis module is specifically configured to: In a case where the rotation speed of the target vehicle is in a preset rotation speed range and the load of the target vehicle is in a preset load range, obtain a slow retreat spark angle fault range and a fast retreat spark angle fault range; For each cylinder of the target vehicle, detect whether the slow retreat spark angle of the cylinder is in the slow retreat spark angle fault range and detect whether the fast retreat spark angle of the cylinder is in the fast retreat spark angle fault range; If the slow retreat spark angle of any cylinder of the target vehicle is in the slow retreat spark angle fault range or the fast retreat spark angle of any cylinder is in the fast retreat spark angle fault range, it is determined that the oil in the target vehicle belongs to poor oil. The first early combustion detection module is specifically configured to: If the rotation speed of the target vehicle is greater than a first rotation speed threshold, the load of the target vehicle is greater than a first load threshold, the fast retreat spark angle is greater than a preset fast retreat spark angle threshold and the slow retreat spark angle is greater than a preset slow retreat spark angle threshold, it is determined that early combustion occurs in the target vehicle. The second early combustion detection module is specifically configured to: If the rotation speed of the target vehicle is greater than a second rotation speed threshold, the load of the target vehicle is greater than a second load threshold and the cycle early combustion count value is greater than a preset count value threshold, it is determined that early combustion occurs in the target vehicle; if early combustion is detected in an early combustion detection cycle, the cycle early combustion count value is directly increased by a preset increment, and if early combustion is not detected in the early combustion detection cycle, the cycle early combustion count value is linearly reduced.

Images