Diesel engine cold start control methods and systems, electronic equipment

Abstract

This invention relates to the field of diesel engines, providing a diesel engine cold start control method, system, and electronic equipment. The method includes: obtaining the diesel engine speed at the Nth injection time most recent; calculating the engine speed increase rate based on the obtained N engine speeds; determining whether the engine speed increase rate meets a first preset condition; and if the first preset condition is met, stopping fuel supply to at least one cylinder in the diesel engine. This addresses the problem that during a cold start, the diesel engine speed increases too quickly, and the speed increase rate is mismatched with the engine's warm-up rate, which may affect the stable operation of the diesel engine, leading to drastic speed fluctuations and frequent misfires. The solution of this application calculates the engine speed increase rate based on the collected engine speeds, and stops fuel supply to the cylinders if the speed increase rate meets the set conditions. This makes the engine speed increase more stable, reducing drastic speed fluctuations and misfires.

Description

Technical Field

[0001] This invention relates to the field of diesel engine technology, and in particular to a diesel engine cold start control method and system, and electronic equipment. Background Technology

[0002] When a diesel engine is cold-started, the low temperature can lead to incomplete fuel combustion, which may result in poor ignition stability and a tendency to stall. To start the engine smoothly, it is often necessary to increase the engine speed to help it warm up more quickly.

[0003] The relevant technologies lack effective means to control the engine speed during cold starts. This may cause the diesel engine speed to rise too quickly during cold starts, and the rate of speed increase may not match the rate of temperature rise of the diesel engine. This may affect the stable operation of the diesel engine, resulting in problems such as violent fluctuations in engine speed and frequent misfires. Summary of the Invention

[0004] This invention provides a diesel engine cold start control method, system, and electronic equipment to solve the problem that the diesel engine speed rises too quickly during cold start, and the speed rise rate is mismatched with the engine's warm-up rate, which may affect the stable operation of the diesel engine, resulting in violent speed fluctuations and frequent misfires. The solution of this application can calculate the speed rise rate based on the collected diesel engine speed. If the speed rise rate meets the set conditions, the fuel supply to the cylinder is stopped, thus making the speed rise of the diesel engine more stable and reducing violent speed fluctuations and diesel engine misfire problems.

[0005] This invention provides a diesel engine cold start control method, comprising:

[0006] Obtain the diesel engine speed at the Nth injection time closest to the current time;

[0007] The rate of increase in engine speed is calculated based on the N obtained engine speeds.

[0008] Determine whether the rate of increase in rotational speed meets the first preset condition;

[0009] If the first preset condition is met, then the fuel supply to at least one cylinder in the diesel engine that is being supplied with fuel shall be stopped.

[0010] According to the diesel engine cold start control method provided by the present invention, determining whether the speed increase rate meets a first preset condition includes:

[0011] Compare the speed increase rate with a first speed increase rate threshold;

[0012] If the speed increase rate is greater than the first speed increase rate threshold, and there is at least one cylinder in the diesel engine that is being supplied with fuel, then the speed increase rate is determined to meet the first preset condition.

[0013] According to the diesel engine cold start control method provided by the present invention, the step of stopping the fuel supply to at least one fuel-supplying cylinder in the diesel engine further includes:

[0014] Determine whether the diesel engine speed is at a stable level. If it is not at a stable level, return and execute the step of obtaining the diesel engine speed at the Nth injection time closest to the current time.

[0015] The diesel engine cold start control method provided by the present invention further includes:

[0016] Determine whether the rate of increase in rotational speed meets the second preset condition;

[0017] If the second preset condition is met, then fuel supply is restored to at least one cylinder in the diesel engine that was previously shut off.

[0018] According to the diesel engine cold start control method provided by the present invention, determining whether the speed increase rate meets the second preset condition includes:

[0019] Compare the speed increase rate with the second speed increase rate threshold;

[0020] If the speed increase rate is less than the second speed increase rate threshold, and there is at least one cylinder in the diesel engine whose fuel supply has been stopped, then the speed increase rate is determined to meet the second preset condition.

[0021] The diesel engine cold start control method provided by the present invention further includes:

[0022] Determine whether the rate of increase in rotational speed meets the third preset condition;

[0023] If the third preset condition is met, continue to calculate the rate of increase of the diesel engine speed based on the obtained diesel engine speed, and determine whether the rate of increase of the diesel engine speed meets the third preset condition, until the diesel engine starts smoothly.

[0024] According to the diesel engine cold start control method provided by the present invention, determining whether the speed increase rate meets a third preset condition includes:

[0025] Compare the speed increase rate with the first speed increase rate threshold and the second speed increase rate threshold;

[0026] If the speed increase rate is less than or equal to the first speed increase rate threshold and greater than or equal to the second speed increase rate threshold, the speed increase rate is determined to meet the third preset condition.

[0027] According to the diesel engine cold start control method provided by the present invention, obtaining the diesel engine speed at the Nth injection time closest to the current time includes:

[0028] It receives the trigger signal after the diesel engine completes fuel injection into the cylinder and obtains the diesel engine speed at the three most recent fuel injection times after the fuel injection completion time.

[0029] The present invention also provides a diesel engine cold start control system, comprising:

[0030] The speed acquisition module is used to obtain the diesel engine speed at the Nth injection time closest to the current time.

[0031] The speed calculation module is used to calculate the speed increase rate of the diesel engine based on the obtained N diesel engine speeds;

[0032] The judgment module is used to determine whether the speed increase rate meets the first preset condition;

[0033] The fuel supply stop module is used to stop supplying fuel to at least one fuel-supplying cylinder in the diesel engine if the first preset condition is met.

[0034] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the above-described diesel engine cold start control methods.

[0035] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described diesel engine cold start control methods.

[0036] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the above-described diesel engine cold start control methods.

[0037] In the diesel engine cold start control method provided in this application, N speed signals of the diesel engine can be acquired. Based on the acquired speed signals, the speed rise rate of the diesel engine can be calculated and determined. If the speed rise rate meets the preset conditions, it indicates that the current speed of the diesel engine is rising too fast, which may cause large speed fluctuations and diesel engine misfire. At this time, fuel supply to at least one fuel-supplying cylinder can be stopped. After stopping the fuel supply, the power of the diesel engine will decrease, thereby reducing the speed rise rate and enabling the diesel engine speed to rise steadily during cold start, improving the stability and safety of the cold start process. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the speed change process during startup provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram illustrating the relationship between diesel engine speed and piston position provided in an embodiment of the present invention;

[0041] Figure 3 This is one of the flowcharts illustrating the diesel engine cold start control method provided in this embodiment of the invention;

[0042] Figure 4 This is the second flowchart of the diesel engine cold start control method provided in the embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the diesel engine cold start control system provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0046] During diesel engine startup, if ignition in the cylinder is delayed, the entire ignition process occurs during the piston's downward stroke, resulting in very low indicated power. When ignition occurs more than 30°CA after top dead center, the indicated power of the cycle drops sharply, and the thermal torque decreases significantly. Therefore, the ignition process before 30°CA is considered the effective power-generating range.

[0047] Figure 1 This is a schematic diagram of the speed change process during startup, provided in an embodiment of the present invention.

[0048] Under cold start conditions, the in-cylinder thermal state has a significant impact on the ignition delay period. For example... Figure 1 By comparing the speed changes during normal start-up and cold start-up, it can be seen that the diesel engine speed fluctuates drastically under cold start conditions. During this stage, the diesel engine ignition is very unstable and misfires frequently occur. This results in the diesel engine's thermal torque being intermittent and the dynamic resistance torque being severely unbalanced.

[0049] Figure 2 This is a schematic diagram showing the relationship between diesel engine speed and piston position provided in an embodiment of the present invention.

[0050] like Figure 2 As shown, for diesel engines, the ignition delay period, measured in crankshaft angle, has the following relationship with engine speed: As engine speed increases, the ignition delay period, measured in crankshaft angle, first shortens and then lengthens. The reason for the delayed ignition point at excessively high engine speeds is that at high engine speeds, the change in in-cylinder thermal conditions decreases, and the ignition delay period, measured in time, remains almost constant. However, when multiplied by engine speed and measured in crankshaft angle, it appears as a delayed ignition point. Under good engine thermal conditions, the ignition delay period is sufficiently short. In this case, as long as the engine speed is maintained above the critical speed, it can stably perform power output and generate thermal torque. When the engine thermal conditions are poor, the ignition delay period is too long. Since the change in thermal conditions is a relatively slow process relative to the engine's working cycle, when the thermal conditions are still low (i.e., low coolant temperature, low combustion chamber wall temperature, and large piston ring clearance), excessively high engine speeds will cause the ignition point to be delayed beyond the effective power range. Therefore, under low thermal conditions, there is an effective working speed range. Only within this speed range can the diesel engine stably output thermal torque. In other words, when the diesel engine speed increase rate is too high, the speed increase rate exceeds the rate of improvement of the thermal state, resulting in a sudden drop in thermal torque and violent fluctuations in diesel engine speed.

[0051] Based on this, this application provides a control method for the cold start process of a diesel engine, which can effectively control the speed increase rate during the cold start process.

[0052] Figure 3This is one of the flowcharts of the diesel engine cold start control method provided in the embodiments of the present invention.

[0053] like Figure 3 As shown, this embodiment provides a diesel engine cold start control method, including:

[0054] Step 301: Obtain the diesel engine speed at the Nth injection time closest to the current time;

[0055] Step 302: Calculate the rate of increase of the diesel engine speed based on the obtained N diesel engine speeds;

[0056] Step 303: Determine whether the speed increase rate meets the first preset condition;

[0057] Step 304: If the first preset condition is met, then stop supplying fuel to at least one cylinder in the diesel engine that is being supplied with fuel.

[0058] In practical applications, the triggering timing of the control method disclosed in this embodiment can be the start of a cold start of the diesel engine. The start of a cold start can be determined by receiving a start signal triggered by the operator, which is also the triggering timing of the control method in this embodiment.

[0059] In this embodiment, the diesel engine speed can be determined by detecting the output shaft of the diesel engine, and the diesel engine speed can be detected after each fuel injection.

[0060] In practice, in step 301 above, the diesel engine speed can be obtained at the Nth injection time closest to the current time after each injection is completed, or the diesel engine speed can be obtained at set intervals of time at the Nth injection time closest to the current time.

[0061] To obtain the diesel engine speed at the Nth injection time closest to the current time after each injection, where N is 3, for example, injection can be performed every 5 seconds. For instance, the first injection is performed at the 5th second, the second at the 10th second, the third at the 15th second, the fourth at the 20th second, the fifth at the 25th second, and so on. The diesel engine speed can be obtained 3 times after each injection. For example, when the injection is completed at the 10th second, the diesel engine speeds after the first, second, and third injections can be obtained. When the injection is completed at the 15th second, the diesel engine speeds after the second, third, and third injections can be obtained.

[0062] In practical applications, when calculating the speed increase rate based on diesel engine speed, one can first calculate the speed increase between two adjacent diesel engine speed measurements. Then, the speed increase rate is obtained by dividing the latter speed increase by the former speed increase. Taking N=3 as an example, the three diesel engine speeds obtained can be the speed after the first injection, the speed after the second injection, and the speed after the third injection. Then, the first speed increase can be calculated based on the speed after the first and second injections, and the second speed increase can be calculated based on the speed after the second and third injections. Finally, the speed increase rate is obtained by dividing the second speed increase by the first speed increase.

[0063] In practice, the first preset condition in this embodiment can be one or more judgment criteria to determine whether the speed increase rate is too high. When the speed increase rate meets the first preset condition, it means that the speed increase rate of the diesel engine is too high, which may pose risks such as unstable speed increase and misfire. Subsequent operations are required to reduce the speed increase rate of the diesel engine. The method of reducing the speed increase rate provided in this embodiment is to stop the fuel supply to the cylinders that are supplied with fuel to the diesel engine. This process can stop the fuel supply to one cylinder or stop the fuel supply to multiple cylinders at the same time. Since the diesel engine obtains power through the piston movement of the cylinders, when the number of cylinders supplied with fuel is reduced, the power source of the diesel engine is reduced, and the obtained speed is naturally reduced, thereby achieving the purpose of reducing the speed increase rate.

[0064] In practical applications, after stopping the fuel supply to at least one cylinder, the steps of obtaining the diesel engine speed and calculating the speed increase rate can be repeated. If the speed increase rate still meets the first preset condition, the fuel supply to the remaining cylinders can be stopped until the speed increase rate does not meet the first preset condition.

[0065] In the diesel engine cold start control method provided in this embodiment, N speed signals of the diesel engine can be acquired. Based on the acquired speed signals, the speed increase rate of the diesel engine can be calculated and determined. If the speed increase rate meets the preset conditions, it indicates that the current speed of the diesel engine is increasing too fast, which may cause large speed fluctuations and diesel engine misfire. At this time, fuel supply to at least one fuel-supplying cylinder can be stopped. After stopping the fuel supply, the power of the diesel engine will decrease, thereby reducing the speed increase rate and enabling the diesel engine speed to rise steadily during cold start, improving the stability and safety of the cold start process.

[0066] In an exemplary embodiment, obtaining the diesel engine speed at the Nth injection time closest to the current time includes:

[0067] It receives the trigger signal after the diesel engine completes fuel injection into the cylinder and obtains the diesel engine speed at the three most recent fuel injection times after the fuel injection completion time.

[0068] In an exemplary embodiment, determining whether the rate of increase in rotational speed meets a first preset condition includes:

[0069] Compare the speed increase rate with a first speed increase rate threshold;

[0070] If the speed increase rate is greater than the first speed increase rate threshold, and there is at least one cylinder in the diesel engine that is being supplied with fuel, then the speed increase rate is determined to meet the first preset condition.

[0071] In this embodiment, a first speed increase rate threshold is set for the speed increase rate. This threshold is the upper limit of the speed increase rate in a stable state. When the speed increase rate of the diesel engine is greater than or equal to the first speed increase rate threshold, it can be determined that the speed of the diesel engine increases too fast. At this time, if there is at least one cylinder in the diesel engine that is being supplied with fuel, it can be determined that the speed increase rate meets the first preset condition.

[0072] In practical applications, the first speed increase rate threshold can be set to 1, meaning that the subsequent speed increase value cannot exceed the previously calculated speed increase value, which can ensure that the diesel engine speed increases smoothly.

[0073] In an exemplary embodiment, the step of stopping fuel supply to at least one fuel-supplying cylinder in the diesel engine further includes:

[0074] Determine whether the diesel engine speed is at a stable level. If it is not at a stable level, return and execute the step of obtaining the diesel engine speed at the Nth injection time closest to the current time.

[0075] In practical applications, if the diesel engine speed rise rate remains high, but there are no cylinders in the diesel engine that are being supplied with fuel, no additional processing is required. Alternatively, a trigger signal can be generated to provide an early warning to the staff based on this trigger signal.

[0076] In practical applications, a start success signal can be generated after the diesel engine starts successfully. Upon receiving this start success signal, the start control of the diesel engine is stopped.

[0077] In an exemplary embodiment, it also includes:

[0078] Determine whether the rate of increase in rotational speed meets the second preset condition;

[0079] If the second preset condition is met, then fuel supply is restored to at least one cylinder in the diesel engine that was previously shut off.

[0080] In practical applications, when a diesel engine has been running for some time, one or more cylinders may have stopped receiving fuel. At this point, the engine speed increase rate may be lower than the first speed increase rate threshold. If the engine speed increase rate remains too low, it may also cause difficulty in starting the diesel engine. In this case, fuel can be re-supplyed to the cylinders that have stopped receiving fuel. During this process, it can be determined whether the engine speed increase rate meets the second preset condition. If it meets the second preset condition, it means that the engine speed increase rate is too low. At this point, fuel can be re-supplyed to at least one cylinder that has stopped receiving fuel. That is to say, fuel can be re-supplyed to one cylinder or multiple cylinders until the engine speed increase rate does not meet the second preset condition.

[0081] In an exemplary embodiment, determining whether the rate of increase in rotational speed meets a second preset condition includes:

[0082] Compare the speed increase rate with the second speed increase rate threshold;

[0083] If the speed increase rate is less than the second speed increase rate threshold, and there is at least one cylinder in the diesel engine whose fuel supply has been stopped, then the speed increase rate is determined to meet the second preset condition.

[0084] In this embodiment, a second speed increase rate threshold is set for the speed increase rate. The second speed increase rate threshold is equivalent to the lower limit of the speed increase rate of the diesel engine under steady conditions. When the speed increase rate of the diesel engine is less than or equal to the second speed increase rate threshold, it indicates that the speed increase of the diesel engine is too low. At this time, if there is at least one cylinder in the diesel engine that has been stopped from supplying fuel, it can be determined that the speed increase rate meets the second preset condition. Furthermore, the fuel supply to the stopped cylinder can be gradually restored to increase the speed increase rate of the diesel engine.

[0085] In an exemplary embodiment, it also includes:

[0086] Determine whether the rate of increase in rotational speed meets the third preset condition;

[0087] If the third preset condition is met, continue to calculate the rate of increase of the diesel engine speed based on the obtained diesel engine speed, and determine whether the rate of increase of the diesel engine speed meets the third preset condition, until the diesel engine starts smoothly.

[0088] In practical applications, the third preset condition is to determine whether the rate of increase of the diesel engine speed is stable. If the rate of increase of the speed meets the third preset condition, it means that the current speed of the diesel engine is increasing at a relatively stable rate. No additional control of the rate of increase of the speed is required. It is only necessary to continue to obtain the diesel engine speed and continue to judge the rate of increase of the speed so that the rate of increase of the diesel engine speed continues to meet the third preset condition, so that the diesel engine can start smoothly.

[0089] In an exemplary embodiment, determining whether the rate of increase in rotational speed meets a third preset condition includes:

[0090] Compare the speed increase rate with the first speed increase rate threshold and the second speed increase rate threshold;

[0091] If the speed increase rate is less than or equal to the first speed increase rate threshold and greater than or equal to the second speed increase rate threshold, the speed increase rate is determined to meet the third preset condition.

[0092] In practical applications, when the rate of increase of the diesel engine speed is between the first and second speed increase thresholds, it can be determined that the rate of increase of the speed speed meets the third preset condition, that is, the speed of the diesel engine is rising steadily.

[0093] In an exemplary embodiment, the first speed increase rate threshold is set to 1.

[0094] In the exemplary embodiment, the first speed increase rate threshold and the second speed increase rate threshold can be the same value. In this case, the third preset condition, i.e., the speed increase rate, is equal to the same value.

[0095] Figure 4 This is the second flowchart of the diesel engine cold start control method provided in the embodiments of the present invention.

[0096] The following is combined Figure 4 The diesel engine cold start control method provided in this application is illustrated by a specific embodiment, including the following steps:

[0097] When the diesel engine starts working under cold start conditions, the engine speed is continuously collected.

[0098] The diesel engine speeds after three consecutive fuel injections are transmitted to the diesel engine's processing module. The three injections represent the speeds after the nth, (n+1th), and (n+2th)th fuel injections, respectively, and the RPM is collected. n RPM n+1 RPM n+2 There are three speed values ​​in total;

[0099] Based on the three speed values, the speed increase rate was calculated.

[0100] R n+1 =(RPM) n+3 -RPM n+2 ) / (RPM n+2 -RPM n+1 )

[0101] The calculated speed increase rate is compared with the preset speed increase rate threshold Rs. The result may be Rn≥Rs or Rn<Rs.

[0102] If the result is Rn≥Rs, meaning the diesel engine speed increase rate is too high, the control module will send a fuel cut-off signal to the execution module, which will stop the fuel injection of one normally operating cylinder during the next fuel injection. If there are no operating cylinders at this time, no operation will be performed. If the result is Rn<Rs, meaning the diesel engine speed increase rate does not exceed the preset value, the control module will continue to send a fuel supply signal to the execution module, which will restore the fuel supply to a non-operating cylinder during the next fuel injection.

[0103] The above control method for the diesel engine continues from the start of the diesel engine until the engine speed reaches a stable level. This stable level can be flexibly determined according to the actual situation.

[0104] The diesel engine cold start control system provided by the present invention is described below. The diesel engine cold start control system described below can be referred to in correspondence with the diesel engine cold start control method described above.

[0105] Figure 5 This is a schematic diagram of the structure of the diesel engine cold start control system provided in an embodiment of the present invention.

[0106] like Figure 5 As shown, the diesel engine cold start control system provided in this embodiment includes:

[0107] The speed acquisition module 501 is used to obtain the diesel engine speed at the Nth injection time closest to the current time.

[0108] The speed calculation module 502 is used to calculate the speed increase rate of the diesel engine based on the obtained N diesel engine speeds;

[0109] The judgment module 503 is used to determine whether the speed increase rate meets the first preset condition;

[0110] The fuel supply stop module 504 is used to stop supplying fuel to at least one cylinder of the diesel engine if the first preset condition is met.

[0111] In the exemplary embodiment, the determination module 503 is specifically used for:

[0112] Compare the speed increase rate with a first speed increase rate threshold;

[0113] If the speed increase rate is greater than the first speed increase rate threshold, and there is at least one cylinder in the diesel engine that is being supplied with fuel, then the speed increase rate is determined to meet the first preset condition.

[0114] In an exemplary embodiment, the fuel supply stop module 504 is further configured to determine whether the speed of the diesel engine is at a stable level. If it is not at a stable level, the module returns to and executes the step of obtaining the diesel engine speed at the Nth injection time closest to the current time.

[0115] In the exemplary embodiment, a second determination module is further included, which is specifically used for:

[0116] Determine whether the rate of increase in rotational speed meets the second preset condition;

[0117] If the second preset condition is met, then fuel supply is restored to at least one cylinder in the diesel engine that was previously shut off.

[0118] In an exemplary embodiment, the second determination module is further configured to:

[0119] Compare the speed increase rate with the second speed increase rate threshold;

[0120] If the speed increase rate is less than the second speed increase rate threshold, and there is at least one cylinder in the diesel engine whose fuel supply has been stopped, then the speed increase rate is determined to meet the second preset condition.

[0121] In the exemplary embodiment, a third determination module is also included, which is specifically used for:

[0122] Determine whether the rate of increase in rotational speed meets the third preset condition;

[0123] If the third preset condition is met, continue to calculate the rate of increase of the diesel engine speed based on the obtained diesel engine speed, and determine whether the rate of increase of the diesel engine speed meets the third preset condition, until it is determined that the diesel engine has started successfully.

[0124] In an exemplary embodiment, the third determination module is further configured to:

[0125] Compare the speed increase rate with the first speed increase rate threshold and the second speed increase rate threshold;

[0126] If the speed increase rate is less than or equal to the first speed increase rate threshold and greater than or equal to the second speed increase rate threshold, the speed increase rate is determined to meet the third preset condition.

[0127] In an exemplary embodiment, the rotational speed acquisition module 501 is further configured to:

[0128] It receives the trigger signal after the diesel engine completes fuel injection into the cylinder and obtains the diesel engine speed at the three most recent fuel injection times after the fuel injection completion time.

[0129] In the exemplary embodiment, the first speed increase rate threshold is set to 1.

[0130] The specific implementation method of the diesel engine cold start control system provided in this embodiment can be implemented with reference to the above embodiment, and will not be repeated here.

[0131] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute a diesel engine cold start control method, which includes:

[0132] Obtain the diesel engine speed at the Nth injection time closest to the current time;

[0133] The rate of increase in engine speed is calculated based on the N obtained engine speeds.

[0134] Determine whether the rate of increase in rotational speed meets the first preset condition;

[0135] If the first preset condition is met, then the fuel supply to at least one cylinder in the diesel engine that is being supplied with fuel shall be stopped.

[0136] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a 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 of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0137] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the diesel engine cold start control method provided by the above methods, the method including:

[0138] Obtain the diesel engine speed at the Nth injection time closest to the current time;

[0139] The rate of increase in engine speed is calculated based on the N obtained engine speeds.

[0140] Determine whether the rate of increase in rotational speed meets the first preset condition;

[0141] If the first preset condition is met, then the fuel supply to at least one cylinder in the diesel engine that is being supplied with fuel shall be stopped.

[0142] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the diesel engine cold start control method provided by the methods described above, the method comprising:

[0143] Obtain the diesel engine speed at the Nth injection time closest to the current time;

[0144] The rate of increase in engine speed is calculated based on the N obtained engine speeds.

[0145] Determine whether the rate of increase in rotational speed meets the first preset condition;

[0146] If the first preset condition is met, then the fuel supply to at least one cylinder in the diesel engine that is being supplied with fuel shall be stopped.

[0147] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0148] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A method of diesel cold start control, characterized by, The method comprises the following steps: obtaining the engine speed of the diesel engine at the time of the Nth injection closest to the current time; calculating the speed increase rate of the diesel engine based on the obtained N engine speeds; determining whether the speed increase rate meets the first preset condition; if the first preset condition is met, stopping fuel supply to at least one cylinder of the diesel engine; the determination of whether the speed increase rate meets the first preset condition comprises: comparing the speed increase rate with the first speed increase rate threshold value; if the speed increase rate is greater than the first speed increase rate threshold value and there is at least one cylinder of the diesel engine being supplied with fuel, it is determined that the speed increase rate meets the first preset condition.

2. The diesel cold start-up control method according to claim 1, characterized by, after the step of stopping fuel supply to at least one cylinder of the diesel engine, the method further comprises the following steps: determining whether the speed of the diesel engine is at a stable level, and if not, returning to and performing the step of obtaining the engine speed of the diesel engine at the time of the Nth injection closest to the current time.

3. The diesel cold start-up control method according to claim 1, characterized by, the method further comprises the following steps: determining whether the speed increase rate meets the second preset condition; if the second preset condition is met, resuming fuel supply to at least one cylinder of the diesel engine whose fuel supply is stopped.

4. The diesel cold start-up control method according to claim 3, characterized by the determination of whether the speed increase rate meets the second preset condition comprises: comparing the speed increase rate with the second speed increase rate threshold value; if the speed increase rate is less than the second speed increase rate threshold value and there is at least one cylinder of the diesel engine whose fuel supply is stopped, it is determined that the speed increase rate meets the second preset condition.

5. The diesel cold start-up control method according to claim 4, characterized by, the method further comprises the following steps: determining whether the speed increase rate meets the third preset condition; if the third preset condition is met, continuing to calculate the speed increase rate of the diesel engine based on the obtained engine speed and determining whether the speed increase rate meets the third preset condition until the diesel engine is started smoothly.

6. The diesel cold start-up control method according to claim 5, characterized by the determination of whether the speed increase rate meets the third preset condition comprises: comparing the speed increase rate with the first speed increase rate threshold value and the second speed increase rate threshold value; if the speed increase rate is less than or equal to the first speed increase rate threshold value and greater than or equal to the second speed increase rate threshold value, it is determined that the speed increase rate meets the third preset condition.

7. The diesel cold start-up control method according to claim 1, characterized by, the step of obtaining the engine speed of the diesel engine at the time of the Nth injection closest to the current time comprises: receiving a trigger signal after the diesel engine completes fuel injection to a cylinder, and obtaining the engine speed of the diesel engine at the time of the third injection closest to the time when the fuel injection is completed.

8. A diesel engine cold start control system characterized by, The method comprises the following steps: a speed acquisition module is configured to obtain the engine speed of the diesel engine at the time of the Nth injection closest to the current time; a speed calculation module is configured to calculate the speed increase rate of the diesel engine based on the obtained N engine speeds; a determination module is configured to determine whether the speed increase rate meets the first preset condition; a fuel supply stopping module is configured to stop fuel supply to at least one cylinder of the diesel engine if the first preset condition is met; the determination module 503 is specifically configured to: compare the speed increase rate with the first speed increase rate threshold value; If the rotation speed increasing rate is greater than the first rotation speed increasing rate threshold value and there is at least one cylinder being supplied with fuel in the diesel engine, it is determined that the rotation speed increasing rate meets the first preset condition.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the diesel engine cold start control method according to any one of claims 1-7 when executing the program.

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