Combustion parameter adjustment method, device, medium and equipment for cold start of engine

Abstract

The application provides an engine cold start combustion parameter adjustment method, device, medium and equipment. The method comprises the following steps: in the case of detecting that the engine is cold started, controlling the engine to start according to a preset cold start combustion parameter, and after the engine starts, detecting the speed peak data of each cylinder of the engine; determining a state abnormal cylinder according to at least the speed peak data of each cylinder, wherein the state abnormal cylinder represents a cylinder with an abnormal combustion state; obtaining the excess air coefficient of the state abnormal cylinder, and adjusting the combustion parameter of the state abnormal cylinder according to the excess air coefficient, wherein the combustion parameter at least comprises an injection amount. The problem that the existing scheme has a low cold start success rate under the cold start working condition of the diesel engine is solved.

Description

Technical Field

[0001] This application relates to the field of combustion parameter adjustment technology for engine cold start, and more specifically, to a method, apparatus, storage medium and electronic device for adjusting combustion parameters for engine cold start. Background Technology

[0002] During the cold start of a diesel engine, the low ambient temperature leads to poor fuel atomization, insufficient cylinder temperature, and increased lubricating oil viscosity, resulting in a significant decrease in combustion efficiency. This can cause problems such as difficulty starting, long starting time, worsened emissions, and even multiple start failures. To improve cold start performance, current technologies generally adopt a uniform calibration strategy, which applies the same fuel injection quantity, intake air quantity, and air-fuel ratio control parameters to all cylinders throughout the starting process. This simplifies the control logic and reduces the computational load on the ECU.

[0003] Some existing technical solutions propose optimizing combustion by pre-setting cold-start injection patterns for different temperature ranges or employing multi-stage injection strategies. However, their core remains "globally unified control," meaning all cylinders share the same set of combustion parameters. This fails to identify and respond to individual differences in combustion states between cylinders caused by factors such as manufacturing tolerances, valve sealing differences, uneven distribution of residual exhaust gas in the cylinder, and minor deviations in fuel injection. Under cold-start conditions, if a cylinder experiences incomplete combustion due to injector carbon buildup or excessive valve clearance, its power output will be lower than that of other cylinders. This results in increased engine speed fluctuations, unbalanced starting torque, prolonged starting time, and even stalling. Summary of the Invention

[0004] The main objective of this application is to provide a method, device, storage medium, and electronic equipment for adjusting combustion parameters during engine cold starting, so as to at least solve the problem that the existing solutions have a low success rate in cold starting conditions of diesel engines.

[0005] To achieve the above objectives, according to one aspect of this application, a method for adjusting combustion parameters during engine cold start is provided, comprising: when engine cold start is detected, controlling engine start according to preset cold start combustion parameters, and after engine start, detecting the speed peak data of each cylinder of the engine; determining at least one abnormal cylinder based on the speed peak data of each cylinder, wherein the abnormal cylinder represents a cylinder with abnormal combustion state; obtaining the excess air coefficient of the abnormal cylinder, and adjusting the combustion parameters of the abnormal cylinder based on the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0006] Optionally, determining the abnormal cylinder based at least on the speed peak data of each of the cylinders includes: acquiring combustion state scoring parameters for each of the cylinders, wherein the combustion state scoring parameters include excess air coefficient deviation, number of consecutive abnormalities, ambient temperature, and engine oil viscosity; performing weighted summation calculation on the speed peak data and the combustion state scoring parameters of each of the cylinders to obtain a combustion state score for each of the cylinders; and determining the abnormal cylinder based on the combustion state score.

[0007] Optionally, before adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: acquiring crankshaft angle data and speed change data of the abnormal cylinder; determining the instantaneous cylinder pressure rise slope of the abnormal cylinder based on the crankshaft angle data and the speed change data; and controlling the combustion parameters of the abnormal cylinder to remain unchanged when the instantaneous cylinder pressure rise slope is within the normal operating range and the speed peak data is less than the peak set value.

[0008] Optionally, after adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: acquiring the ambient temperature and engine oil viscosity at the current moment; determining the response verification window of the abnormal cylinder according to the ambient temperature and engine oil viscosity; and collecting the speed peak data of the abnormal cylinder again according to the response verification window, wherein the response verification window is a time window for re-verifying the speed peak data of the abnormal cylinder after adjusting the combustion parameters.

[0009] Optionally, determining the response verification window for the abnormal cylinders based on the ambient temperature and the engine oil viscosity includes: when the ambient temperature is less than a preset temperature and / or the engine oil viscosity is greater than a preset viscosity, determining the power stroke of a first number of abnormal cylinders as the response verification window; when the ambient temperature is greater than or equal to the preset temperature and the engine oil viscosity is less than or equal to the preset viscosity, determining the power stroke of a second number of abnormal cylinders as the response verification window, wherein the first number is greater than the second number.

[0010] Optionally, after adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: after detecting multiple cold starts of the engine, acquiring the speed response curve and fuel injection quantity correction data of each cylinder of the engine; constructing a fuel injection quantity adjustment table for each cylinder according to the mapping relationship between the speed response curve and the fuel injection quantity correction data, wherein the fuel injection quantity adjustment table is used to pre-adjust the fuel injection quantity of each cylinder during cold starts of the engine.

[0011] Optionally, adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient includes: adjusting the combustion parameters of the abnormal cylinder using a PID algorithm based on the excess air coefficient.

[0012] According to another aspect of this application, a combustion parameter adjustment device for engine cold start is provided, comprising: a detection unit, configured to control engine start according to preset cold start combustion parameters when engine cold start is detected, and to detect the speed peak data of each cylinder of the engine after engine start; a determination unit, configured to determine abnormal cylinders at least based on the speed peak data of each cylinder, wherein the abnormal cylinders represent cylinders with abnormal combustion states; and an adjustment unit, configured to acquire the excess air coefficient of the abnormal cylinders and adjust the combustion parameters of the abnormal cylinders according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0013] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the described methods for adjusting combustion parameters for cold starting of an engine.

[0014] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the described methods for adjusting combustion parameters for cold starting an engine.

[0015] By applying the technical solution of this application, and introducing control logic such as speed peak data, abnormal cylinder identification, excess air coefficient feedback, and dynamic adjustment of combustion parameters during cold starts, adaptive optimization based on single-cylinder combustion efficiency is achieved during the cold start process of a diesel engine. This avoids the situation where poorly burning cylinders are continuously under- or over-supplied with fuel due to a lack of perception of the differences in work done by each cylinder, which exacerbates the risk of starting vibration and failure. This solution accurately identifies cylinders with deteriorating combustion by collecting real speed peaks (reflecting the work done in the cylinder) and dynamically corrects the fuel injection quantity by combining the excess air coefficient as a combustion state indicator, so that the combustion of each cylinder tends to be balanced, thus improving the success rate of cold starts of diesel engines. This solves the problem of low cold start success rate in existing solutions for diesel engines. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for performing a combustion parameter adjustment method for cold starting an engine, according to an embodiment of this application, is shown.

[0018] Figure 2 A schematic flowchart of a method for adjusting combustion parameters for cold starting of an engine, according to an embodiment of this application, is shown.

[0019] Figure 3 A structural block diagram of a combustion parameter adjustment device for cold starting an engine, according to an embodiment of this application, is shown. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] 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 should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this 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 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.

[0023] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0024] Excess air coefficient: The excess air coefficient is a ratio used in the combustion process to describe the actual amount of air supplied to the theoretical amount of air required for complete combustion of fuel.

[0025] As described in the background section, existing solutions have a low success rate in cold starting conditions for diesel engines. To address this issue, embodiments of this application provide a method, apparatus, storage medium, and electronic device for adjusting combustion parameters during engine cold starting.

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method of adjusting combustion parameters for cold starting of an engine, according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0028] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the engine cold start combustion parameter adjustment method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0029] This embodiment provides a method for adjusting combustion parameters during cold start of an engine, which runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0030] Figure 2 This is a flowchart of a method for adjusting combustion parameters during cold starting of an engine according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0031] Step S201: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected.

[0032] Step S202: Determine the cylinder with abnormal state based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the above-mentioned cylinder with abnormal state represents the cylinder with abnormal combustion state.

[0033] Step S203: Obtain the excess air coefficient of the above-mentioned abnormal cylinder, and adjust the combustion parameters of the above-mentioned abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0034] This embodiment, by applying steps S201, S202, and S203, introduces control logic for cold starting diesel engines, including speed peak data, identification of cylinders with abnormal combustion status, feedback of excess air coefficient, and dynamic adjustment of combustion parameters. This achieves adaptive optimization based on single-cylinder combustion efficiency. It avoids the risk of insufficient or excessive fuel supply to poorly burning cylinders due to a lack of perception of differences in cylinder work output, which exacerbates starting vibration and failure. This solution accurately identifies cylinders with poor combustion by collecting real speed peaks (reflecting the amount of work done in the cylinder) and dynamically adjusts the fuel injection quantity based on the excess air coefficient, a combustion status indicator, to achieve balanced combustion in each cylinder and improve the success rate of cold starting diesel engines. This solves the problem of low cold start success rates in existing solutions for diesel engines.

[0035] In the specific implementation process, at least the abnormal cylinder is determined based on the speed peak data of each of the above-mentioned cylinders, including: obtaining the combustion state scoring parameters of each of the above-mentioned cylinders, wherein the combustion state scoring parameters include excess air coefficient deviation, number of consecutive abnormalities, ambient temperature and oil viscosity; performing weighted summation calculation on the speed peak data and combustion state scoring parameters of each of the above-mentioned cylinders to obtain the combustion state score of each of the above-mentioned cylinders, and determining the abnormal cylinder based on the combustion state score.

[0036] Specifically, based on the combustion status score, the cylinders with abnormal status are identified. If the combustion status score of a cylinder is detected to be greater than the score threshold multiple times (e.g., 3 times) consecutively, then the cylinder is determined to be a cylinder with abnormal status.

[0037] In this embodiment, a multi-dimensional combustion state scoring model is constructed, which weights and fuses multiple signals such as engine speed peaks, excess air coefficient deviations, number of consecutive anomalies, ambient temperature, and engine oil viscosity to achieve intelligent comprehensive identification of "abnormal cylinders." Compared with traditional methods that rely solely on a single threshold of engine speed peaks, this solution effectively suppresses misjudgments caused by sensor noise, instantaneous load fluctuations, or mechanical vibrations, improving the accuracy of anomaly identification. Especially under extreme conditions where engine oil viscosity increases or low temperatures exacerbate engine speed fluctuations, the system can distinguish between genuine combustion anomalies and environmental interference, avoiding misadjustments and ensuring the robustness and stability of the control strategy.

[0038] Specifically, before adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: acquiring crankshaft angle data and speed change data of the abnormal cylinder; determining the instantaneous cylinder pressure rise slope of the abnormal cylinder based on the crankshaft angle data and the speed change data; and controlling the combustion parameters of the abnormal cylinder to remain unchanged when the instantaneous cylinder pressure rise slope is within the normal operating range and the speed peak data is less than the peak set value.

[0039] In this embodiment, the "instantaneous cylinder pressure rise slope" is introduced as an indirect criterion for combustion quality. Combined with engine speed peak and crankshaft angle data, a dual verification mechanism is constructed. When the cylinder pressure rise slope is within the normal range, it indicates that the air-fuel mixture compression and ignition processes in the cylinder are normal. Even if the engine speed peak is low, it may be due to mechanical resistance or fuel atomization delay, rather than combustion failure. At this time, the system actively suppresses fuel injection adjustments to avoid "overcompensation" that could lead to detonation or worsened emissions. This mechanism effectively prevents oscillations and misadjustments in the control system, improves system stability, extends injector lifespan, and reduces NOx and soot emission fluctuations caused by frequent fuel injection adjustments.

[0040] More specifically, after adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: acquiring the ambient temperature and oil viscosity at the current moment; determining the response verification window of the abnormal cylinder based on the ambient temperature and oil viscosity; and collecting the speed peak data of the abnormal cylinder again based on the response verification window, wherein the response verification window is a time window for verifying the speed peak data of the abnormal cylinder again after adjusting the combustion parameters.

[0041] In this embodiment, the concept of a "response verification window" is proposed. This window dynamically sets the observation period based on the ambient temperature and engine oil viscosity after parameter adjustments, avoiding misjudgments caused by response delays. In low-temperature, high-viscosity environments, fuel evaporation is slow and combustion lag is significant. Collecting engine speed data too early will mistakenly lead to the conclusion that the adjustment is ineffective. Conversely, at normal temperatures, excessive delays will affect starting efficiency. This solution, through an adaptive verification window, ensures that effective feedback is collected within a reasonable time window, improving the response efficiency and accuracy of the control closed loop.

[0042] Further, determining the response verification window for the abnormal cylinders based on the ambient temperature and the engine oil viscosity includes: when the ambient temperature is lower than a preset temperature and / or the engine oil viscosity is higher than a preset viscosity, determining the power stroke of a first number of abnormal cylinders as the response verification window; when the ambient temperature is higher than or equal to the preset temperature and the engine oil viscosity is lower than or equal to the preset viscosity, determining the power stroke of a second number of abnormal cylinders as the response verification window, wherein the first number is greater than the second number.

[0043] The first quantity can be set to 5-8, and the second quantity can be set to 2-3.

[0044] In this embodiment, the response verification window is quantitatively graded by linking ambient temperature and engine oil viscosity as dual parameters. Under low temperature and high viscosity conditions, the combustion response cycle is prolonged, requiring an extended observation window (first quantity) to capture the true effect; under normal temperature and low viscosity conditions, the response is rapid, allowing for a shorter window (second quantity) and faster control. This grading mechanism enables the system to adapt to the environment, avoiding control lag or oversensitivity caused by a "one-size-fits-all" approach.

[0045] Furthermore, after adjusting the combustion parameters of the abnormal cylinder according to the aforementioned excess air coefficient, the method further includes: after detecting multiple cold starts of the engine, acquiring the speed response curve and fuel injection quantity correction data of each of the aforementioned cylinders of the engine; constructing a fuel injection quantity adjustment table for each of the aforementioned cylinders according to the mapping relationship between the aforementioned speed response curve and the aforementioned fuel injection quantity correction data, wherein the aforementioned fuel injection quantity adjustment table is used to pre-adjust the aforementioned fuel injection quantity of each of the aforementioned cylinders during cold starts of the engine.

[0046] In this embodiment, based on dynamic adjustment, a learning and solidification closed loop is further implemented. By collecting the speed response curves and injection correction amounts of each cylinder through multiple cold starts, an individualized injection quantity adjustment table is established, upgrading the original online real-time adjustment to a dual-mode of online correction + offline calibration. This not only reduces the real-time calculation load on the ECU but also gives the system memory capabilities, allowing it to directly recall the optimal parameters under subsequent environmental conditions. This embodiment breaks through the limitations of traditional calibration relying on repeated laboratory tests, achieving "user operating condition self-learning" and significantly improving the long-term reliability of the product in actual use.

[0047] Specifically, adjusting the combustion parameters of the abnormal cylinder based on the excess air coefficient includes: adjusting the combustion parameters of the abnormal cylinder using a PID algorithm based on the excess air coefficient.

[0048] In this embodiment, a PID algorithm is used to perform closed-loop regulation of the excess air coefficient and fuel injection quantity, ensuring the adjustment process is continuous, stable, and adjustable. Compared to simple on / off adjustments of fuel injection quantity, the PID algorithm can achieve smooth and gradual adjustment based on the magnitude and cumulative trend of the error, avoiding speed fluctuations, black smoke, or start-up jerking caused by sudden changes in fuel injection quantity. By properly tuning the proportional, integral, and derivative parameters, the system can optimize the fuel injection quantity of a single cylinder in a short time, with fast response and high adjustment accuracy, significantly improving the smoothness of cold starts and emission stability.

[0049] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the combustion parameter adjustment method for engine cold start of this application will be described in detail below with reference to specific embodiments.

[0050] This embodiment relates to a specific method for adjusting combustion parameters during engine cold starts. When the engine is ready to start, it is first determined whether a cold start is required. If not, a normal start is performed. If so, the engine is started according to predetermined cold start combustion parameters, which include fuel injection quantity, air-fuel ratio, idle speed, and intake air volume. The actual engine speed is monitored. Based on the cylinder numbers in the engine ECU data and the actual engine speed before filtering, the peak speed of each cylinder after power stroke can be determined. At this time, the actual speed peak corresponding to each cylinder after power stroke is detected. When the peak speed of a certain cylinder's power stroke is consistently lower than the average peak speed of all cylinders (below a certain percentage), the combustion state of that cylinder is considered poor, and dynamic adjustment of combustion parameters is required. If adjustment is needed, the excess air coefficient under the current condition must be determined. If it is too high, the fuel injection quantity of that cylinder is gradually increased; if it is too low, the fuel injection quantity of that cylinder is gradually decreased. By gradually adjusting the power stroke speed of each cylinder, it is determined whether dynamic adjustment of combustion parameters is still needed. If it is needed, the adjustment continues; if not, the engine is started according to the adjusted calibration parameters.

[0051] The specific solution of this embodiment includes the following steps:

[0052] Step S1: Determine whether the engine needs a cold start based on the engine temperature, exhaust temperature, and ambient temperature;

[0053] The smallest of the engine temperature, exhaust temperature, and ambient temperature is defined as a; the smallest of the engine temperature and exhaust temperature is defined as b; the largest of a and b is defined as c. By comparing c with the limit value, it is determined whether the engine is in a cold start state.

[0054] Step S2: When the engine is confirmed to be in a cold start state, start the engine according to the cold start combustion parameters MAP of the calibration number and monitor the actual engine speed; when the engine is in the starting state, detect the actual speed peak corresponding to each cylinder number after it has done power. If the speed peak of a certain cylinder number is lower than the average peak of the power speed of each cylinder for several consecutive times, it is considered that the combustion state of that cylinder is poor and the combustion parameters need to be dynamically adjusted.

[0055] In addition to detecting the combustion state of a cylinder by observing the peak speed, the combustion state of a cylinder can also be detected by constructing a combustion state scoring function. The combustion state scoring function dynamically weights each cylinder based on the current peak speed deviation, the number of consecutive abnormalities, the direction of excess air coefficient offset, ambient temperature, and engine oil viscosity. Only when the score of a certain cylinder continuously exceeds the threshold is the fuel injection quantity adjusted to avoid erroneous adjustment caused by instantaneous speed disturbances (such as oil pressure fluctuations). At the same time, the adjustment range adopts integral-proportional composite control to prevent over-adjustment of fuel injection quantity.

[0056] The cold start process is divided into a pre-injection stage, a main injection start stage, and a stable transition stage, with different speed deviation thresholds and adjustment step sizes set for each stage:

[0057] Pre-spray stage: Only monitor whether ignition occurs, no adjustments are made;

[0058] Main injection start-up phase: When the speed deviation is >15%, start the single cylinder injection quantity fine adjustment (step ±1%).

[0059] Stable transition phase: If the speed deviation is less than 5% and lasts for 2 seconds, the current parameters are locked and normal operation is resumed.

[0060] Step S3: In low-temperature environments, some cylinders may experience lower engine speed peaks due to carbon buildup or poor lubrication, possibly caused by mechanical resistance rather than poor combustion. Before determining if a cylinder has poor combustion, the instantaneous cylinder pressure rise slope for that cylinder is simultaneously collected (inferred from crankshaft angle and engine speed changes). If the engine speed peak is low but the cylinder pressure rise slope is normal, it is determined to be a mechanical problem, and the fuel injection quantity for that cylinder is not adjusted. This avoids excessive increases in oil concentration due to misjudgment, which could lead to black smoke or increased carbon buildup in the engine.

[0061] Step S4: Determine whether to increase or decrease fuel injection based on the current excess air coefficient, and control the amount of fuel injection based on the dynamic trend of the excess air coefficient: If the excess air coefficient is currently high but is continuously decreasing (e.g. due to enhanced intake swirl), then temporarily suspend increasing fuel injection to avoid excessive richness due to trend reversal; conversely, if the excess air coefficient is currently low and is continuously increasing (e.g. due to improved fuel atomization), then temporarily suspend reducing fuel injection to prevent excessive reduction in combustion.

[0062] Step S6: Dynamically set the length of the "response verification window" based on the current ambient temperature and engine oil viscosity. At low temperatures (< -10℃) or high viscosity, the window is extended to 5-8 power strokes; at normal temperature, only 2-3 strokes are required. The adjustment is considered effective and the parameters are locked only if the stable conditions are met within the verification window.

[0063] Step S7: After multiple cold starts, automatically record the typical speed response curve and required fuel injection correction amount of each cylinder under the same ambient temperature to build a cylinder profile; through the cylinder profile, in subsequent cold starts, prioritize earlier and stronger intervention on the cylinder that has consistently performed the worst in history, rather than treating all deviation cylinders the same; at the same time, set a higher trigger threshold for cylinders with stable performance and reduce the adjustment frequency.

[0064] Step S8: Start the engine according to the adjusted combustion parameters.

[0065] The embodiments of this application can determine the combustion state in the cylinder based on the actual speed reflected after each cylinder compresses and does power, and adjust the combustion parameters in real time based on the excess air coefficient according to the combustion state to ensure that each cylinder can burn and do power fully, thereby improving cold start efficiency.

[0066] This application also provides a combustion parameter adjustment device for engine cold starting. It should be noted that the combustion parameter adjustment device for engine cold starting in this application can be used to execute the combustion parameter adjustment method for engine cold starting provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0067] The following describes the combustion parameter adjustment device for cold starting of an engine provided in the embodiments of this application.

[0068] Figure 3 This is a schematic diagram of a combustion parameter adjustment device for cold starting an engine according to an embodiment of this application. Figure 3 As shown, the device includes:

[0069] The detection unit 31 is used to control the engine to start according to the preset cold start combustion parameters when the engine is detected to be cold starting, and to detect the speed peak data of each cylinder of the engine after the engine is started.

[0070] The determining unit 32 is used to determine the abnormal state cylinder based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the abnormal state cylinder represents the cylinder with abnormal combustion state.

[0071] The adjustment unit 33 is used to obtain the excess air coefficient of the cylinder in the abnormal state, and adjust the combustion parameters of the cylinder in the abnormal state according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0072] In this embodiment, the detection unit is used to control the engine to start according to preset cold start combustion parameters when a cold start is detected, and to detect the speed peak data of each cylinder after the engine starts; the determination unit is used to determine the abnormal cylinders based at least on the speed peak data of each cylinder, wherein the abnormal cylinders represent cylinders with abnormal combustion conditions; the adjustment unit is used to obtain the excess air coefficient of the abnormal cylinders and adjust the combustion parameters of the abnormal cylinders based on the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity. By introducing control logic of speed peak data, abnormal cylinder identification, excess air coefficient feedback, and dynamic adjustment of combustion parameters during cold start, adaptive optimization based on single-cylinder combustion efficiency is achieved during the cold start process of a diesel engine. This avoids the risk of continuous insufficient or excessive fuel supply to poorly burning cylinders due to a lack of perception of the differences in the work done by each cylinder, which exacerbates the risk of start-up jitter and failure. This solution accurately identifies cylinders with poor combustion by collecting real engine speed peaks (reflecting the amount of work done in the cylinder), and dynamically adjusts the fuel injection quantity based on the excess air coefficient, a key indicator of combustion status, to achieve more balanced combustion in each cylinder and improve the success rate of cold starts for diesel engines. This solves the problem of low cold start success rates in existing solutions for diesel engines.

[0073] As an optional solution, the determining unit includes an acquisition module and a calculation and processing module; the acquisition module is used to acquire the combustion state scoring parameters of each of the above-mentioned cylinders, wherein the combustion state scoring parameters include excess air coefficient deviation, number of consecutive abnormalities, ambient temperature and engine oil viscosity; the calculation and processing module is used to perform weighted summation calculation on the above-mentioned speed peak data and the above-mentioned combustion state scoring parameters of each of the above-mentioned cylinders to obtain the combustion state score of each of the above-mentioned cylinders, and to determine the above-mentioned abnormal cylinders based on the above-mentioned combustion state scores.

[0074] In one optional embodiment, the device further includes a first acquisition unit and a control unit; the first acquisition unit is used to acquire crankshaft angle data and speed change data of the abnormal cylinder before adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, and to determine the instantaneous cylinder pressure rise slope of the abnormal cylinder based on the crankshaft angle data and the speed change data; the control unit is used to control the combustion parameters of the abnormal cylinder to remain unchanged when the instantaneous cylinder pressure rise slope is within the normal operating range and the speed peak data is less than the peak set value.

[0075] In one optional embodiment, the device further includes a second acquisition unit and a collection unit; the second acquisition unit is used to acquire the ambient temperature and engine oil viscosity at the current moment after adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient; the collection unit is used to determine the response verification window of the abnormal cylinder according to the ambient temperature and engine oil viscosity, and to collect the speed peak data of the abnormal cylinder again according to the response verification window, wherein the response verification window is a time window for re-verifying the speed peak data of the abnormal cylinder after adjusting the combustion parameters.

[0076] In one optional scheme, the acquisition unit includes a first determining module and a second determining module. The first determining module is used to determine the power stroke of a first number of abnormal cylinders as the response verification window when the ambient temperature is lower than a preset temperature and / or the engine oil viscosity is higher than a preset viscosity. The second determining module is used to determine the power stroke of a second number of abnormal cylinders as the response verification window when the ambient temperature is higher than or equal to the preset temperature and the engine oil viscosity is lower than or equal to the preset viscosity, wherein the first number is greater than the second number.

[0077] In one alternative embodiment, the apparatus further includes a third acquisition unit and a construction unit; the third acquisition unit is used to acquire the speed response curve and fuel injection quantity correction data of each cylinder of the engine after adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient and after detecting multiple cold starts of the engine; the construction unit is used to construct a fuel injection quantity adjustment table for each cylinder according to the mapping relationship between the speed response curve and the fuel injection quantity correction data, wherein the fuel injection quantity adjustment table is used to pre-adjust the fuel injection quantity of each cylinder during cold starts of the engine.

[0078] In one alternative, the adjustment unit includes an adjustment processing module, used to adjust the combustion parameters of the abnormal cylinder using a PID algorithm based on the excess air coefficient.

[0079] The aforementioned combustion parameter adjustment device for cold starting the engine includes a processor and a memory. The detection unit, determination unit, and adjustment unit are all stored as program units in the memory, and the processor executes these program units to achieve their respective functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0080] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the low cold-start success rate of existing solutions for diesel engines.

[0081] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0082] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the combustion parameter adjustment method for cold starting of an engine.

[0083] Specifically, the methods for adjusting combustion parameters during engine cold starts include:

[0084] Step S201: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected.

[0085] Step S202: Determine the cylinder with abnormal state based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the above-mentioned cylinder with abnormal state represents the cylinder with abnormal combustion state.

[0086] Step S203: Obtain the excess air coefficient of the above-mentioned abnormal cylinder, and adjust the combustion parameters of the above-mentioned abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0087] This invention provides a processor for running a program, wherein the program executes the combustion parameter adjustment method for cold starting of an engine.

[0088] Specifically, the methods for adjusting combustion parameters during engine cold starts include:

[0089] Step S201: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected.

[0090] Step S202: Determine the cylinder with abnormal state based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the above-mentioned cylinder with abnormal state represents the cylinder with abnormal combustion state.

[0091] Step S203: Obtain the excess air coefficient of the above-mentioned abnormal cylinder, and adjust the combustion parameters of the above-mentioned abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0092] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0093] Step S201: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected.

[0094] Step S202: Determine the cylinder with abnormal state based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the above-mentioned cylinder with abnormal state represents the cylinder with abnormal combustion state.

[0095] Step S203: Obtain the excess air coefficient of the above-mentioned abnormal cylinder, and adjust the combustion parameters of the above-mentioned abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0096] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0097] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0098] Step S201: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected.

[0099] Step S202: Determine the cylinder with abnormal state based at least on the above-mentioned speed peak data of each of the above-mentioned cylinders, wherein the above-mentioned cylinder with abnormal state represents the cylinder with abnormal combustion state.

[0100] Step S203: Obtain the excess air coefficient of the above-mentioned abnormal cylinder, and adjust the combustion parameters of the above-mentioned abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

[0101] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0102] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can 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.) containing computer-usable program code.

[0103] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0107] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0108] Computer-readable media include both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can 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 technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0111] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of adjusting a combustion parameter of a cold engine start, characterized by, include: When a cold start is detected, the engine is started according to the preset cold start combustion parameters, and after the engine starts, the speed peak data of each cylinder of the engine is detected. At least based on the speed peak data of each of the cylinders, the abnormal state cylinder is determined, wherein the abnormal state cylinder is characterized by an abnormal combustion state. Obtain the excess air coefficient of the abnormal cylinder, and adjust the combustion parameters of the abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity; After adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: acquiring the ambient temperature and oil viscosity at the current moment, determining the response verification window of the abnormal cylinder according to the ambient temperature and oil viscosity, and collecting the speed peak data of the abnormal cylinder again according to the response verification window, wherein the response verification window is a time window for re-verifying the speed peak data of the abnormal cylinder after adjusting the combustion parameters; Determining the response verification window for the abnormal state cylinders based on the ambient temperature and the engine oil viscosity includes: when the ambient temperature is less than a preset temperature and / or the engine oil viscosity is greater than a preset viscosity, determining the power stroke of a first number of abnormal state cylinders as the response verification window; when the ambient temperature is greater than or equal to the preset temperature and the engine oil viscosity is less than or equal to the preset viscosity, determining the power stroke of a second number of abnormal state cylinders as the response verification window, wherein the first number is greater than the second number.

2. The method according to claim 1, characterized in that, At least the cylinders with abnormal conditions are identified based on the speed peak data of each of the aforementioned cylinders, including: Obtain combustion state rating parameters for each cylinder, wherein the combustion state rating parameters include excess air coefficient deviation, number of consecutive abnormalities, ambient temperature, and engine oil viscosity; The combustion state score of each cylinder is obtained by weighted summation of the speed peak data and the combustion state score parameters. The cylinder with abnormal state is determined based on the combustion state score.

3. The method according to claim 1, characterized in that, Before adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: Obtain the crankshaft angle data and speed change data of the abnormal cylinder, and determine the instantaneous cylinder pressure rise slope of the abnormal cylinder based on the crankshaft angle data and the speed change data; When the instantaneous cylinder pressure rise slope is within the normal operating range and the speed peak data is less than the peak set value, the combustion parameters of the abnormal cylinder are kept unchanged.

4. The method according to claim 1, characterized in that, After adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient, the method further includes: After detecting multiple cold starts of the engine, the speed response curves and fuel injection quantity correction data of each cylinder of the engine are acquired. Based on the mapping relationship between the speed response curve and the fuel injection quantity correction data, a fuel injection quantity adjustment table for each cylinder is constructed, wherein the fuel injection quantity adjustment table is used to pre-adjust the fuel injection quantity of each cylinder when the engine is cold started.

5. The method according to claim 1, characterized in that, Adjusting the combustion parameters of the abnormal cylinder according to the excess air coefficient includes: Based on the excess air coefficient, a PID algorithm is used to adjust the combustion parameters of the cylinder in the abnormal state.

6. A combustion parameter adjustment device for cold starting an engine, characterized in that, The device is used to perform the combustion parameter adjustment method for cold starting of an engine as described in any one of claims 1 to 5, including: The detection unit is used to control the engine to start according to preset cold start combustion parameters when the engine is detected to be cold start, and to detect the speed peak data of each cylinder of the engine after the engine starts. A determining unit is configured to determine a cylinder with abnormal state based at least on the speed peak data of each of the cylinders, wherein the cylinder with abnormal state characterizes a cylinder with abnormal combustion state. An adjustment unit is used to obtain the excess air coefficient of the abnormal cylinder and adjust the combustion parameters of the abnormal cylinder according to the excess air coefficient, wherein the combustion parameters include at least the fuel injection quantity.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the combustion parameter adjustment method for cold starting of an engine as described in any one of claims 1 to 5.

8. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a combustion parameter adjustment method for cold starting an engine as described in any one of claims 1 to 5.

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