Engine intake preheating method, system and device, and engine

Abstract

This invention relates to the field of engines, providing an engine intake air preheating method, system, device, and engine. The method includes: acquiring ambient temperature and atmospheric pressure values ​​after the engine is powered on; if the ambient temperature is less than 0 degrees Celsius, heating the air entering the engine through a heating rod, and injecting fuel onto the surface of the heating rod based on a pre-constructed MAP map; after starting the engine, acquiring the engine speed, and if the engine speed is higher than a first set speed, completing the engine intake air preheating. This invention addresses the shortcomings of existing diesel engines in cold starts at high altitudes, enabling the minimum intake air preheating power to adaptively adjust with engine speed, altitude, and ambient temperature during diesel engine startup. It supplements the deficiencies of existing design methods and improves the environmental adaptability of diesel engines.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine intake preheating method, system, device, and engine. Background Technology

[0002] Diesel spray misfire is the root cause of poor cold-start performance in diesel engines. During engine startup, low engine speed, high air leakage, and high heat dissipation lead to a decrease in the final compression temperature and density within the cylinder. This increases the ignition delay period of the diesel spray, and may even result in partial auto-ignition or misfire. In low-temperature environments, diesel spray auto-ignition becomes even more difficult, and the increased oil viscosity leads to a sharp increase in starting torque, resulting in severe power deficiency during engine startup. Furthermore, in high-altitude environments, the final compression density within the cylinder further decreases during cold starts, making diesel spray auto-ignition even more challenging, thus contributing to poor cold-start performance at high altitudes.

[0003] Preheating the intake air of a diesel engine, raising its temperature before it enters the engine, effectively increases the cylinder compression final temperature, preventing misfires and is a crucial method for addressing the poor cold-start performance of diesel engines in high-altitude environments. During the cold start phase, the exhaust gas turbocharger is inactive; only the fresh air heated by the intake preheating device enters the diesel engine cylinders directly. Previous diesel engine electric intake preheating devices had constant preheating power or fuel supply rate, and their preheating power did not change with engine speed, atmospheric temperature, or altitude. Therefore, current redundant designs of intake preheating devices are generally designed for the lowest temperature and maximum intake volume conditions at low altitudes. Their preheating power does not change with engine speed and lacks environmental adaptability to variations in ambient temperature and pressure. Summary of the Invention

[0004] This invention provides an engine intake air preheating method, system, device, and engine to address the shortcomings of existing technologies where the final density of in-cylinder compression further decreases during cold starts in high-altitude environments, making diesel spray auto-ignition more difficult and resulting in poor cold start performance of diesel engines at high altitudes. The invention achieves minimum intake air preheating power that adaptively adjusts with engine speed, altitude, and atmospheric temperature during diesel engine startup, supplementing the deficiencies of existing design methods and improving the environmental adaptability of diesel engines.

[0005] This invention provides a method for preheating engine intake air, comprising:

[0006] After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected.

[0007] If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by the heating rod, and fuel is injected onto the surface of the heating rod based on a pre-built MAP. The MAP is the correspondence between atmospheric pressure, ambient temperature, engine speed and injection frequency and injection pulse width, where injection frequency and injection pulse width characterize the injection rate of the injector.

[0008] After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0009] According to the engine intake air preheating method provided by the present invention, fuel is injected onto the surface of a heating rod based on a pre-constructed MAP map, comprising:

[0010] The first injection frequency and the first injection pulse width are determined based on the ambient temperature and atmospheric pressure values ​​in a pre-constructed MAP map.

[0011] Fuel is injected onto the surface of the heating rod based on the first injection frequency and the first injection pulse width.

[0012] According to the engine intake air preheating method provided by the present invention, the engine speed is collected, and if the engine speed is higher than a first set speed, the engine intake air preheating is completed, including:

[0013] The engine speed is collected in real time. If the engine speed is not higher than the first set speed, the second injection frequency and the second injection pulse width are determined in the pre-constructed MAP based on the ambient temperature, atmospheric pressure and engine speed.

[0014] Fuel is injected onto the surface of the heating rod based on the second injection frequency and the second injection pulse width.

[0015] If the engine speed is higher than the first set speed, fuel injection will stop.

[0016] The engine intake air preheating method provided by the present invention further includes:

[0017] If the engine speed is lower than the second set speed, fuel injection will stop.

[0018] The engine intake air preheating method provided by the present invention further includes:

[0019] The timing of fuel injection is recorded. If fuel injection continues for more than the first time, fuel injection is stopped.

[0020] The engine intake air preheating method provided by the present invention further includes:

[0021] If the ambient temperature is greater than or equal to 0 degrees Celsius, the engine speed is detected. If the engine speed is less than the third set speed and the duration exceeds the second time, the engine intake preheating is not performed.

[0022] The present invention also provides an engine intake air preheating system, comprising:

[0023] The data acquisition module is used to collect ambient temperature and atmospheric pressure values ​​after the engine is powered on;

[0024] The fuel injection module is used to heat the air entering the engine through a heating rod if the ambient temperature is less than 0 degrees Celsius, and inject fuel onto the surface of the heating rod based on a pre-built MAP. The MAP is the correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width, where fuel injection frequency and fuel injection pulse width characterize the fuel injection rate of the injector.

[0025] The preheating completion module is used to collect the engine speed after the engine is started. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0026] The present invention also provides an engine intake air preheating device, comprising:

[0027] A control component for performing any of the above-described engine intake air preheating methods;

[0028] A heating rod, electrically connected to a control component, is used to heat air under the control of the control component;

[0029] An electronic fuel injector, electrically connected to a control unit, is used to spray fuel onto a heating rod under the control of the control unit.

[0030] The communication connector is electrically connected to the control components and is used for communication between the control components and the engine.

[0031] The engine intake preheating device provided by this invention is installed in the engine intake passage.

[0032] The present invention also provides a diesel engine, wherein the intake air preheating is performed using any of the above-mentioned engine intake air preheating methods.

[0033] 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 engine intake preheating methods described above.

[0034] 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 engine intake preheating methods described above.

[0035] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the engine intake preheating methods described above.

[0036] The solution of this application can obtain the minimum injection pulse width, injection frequency and flame preheating power of the diesel engine intake air preheating device according to the diesel engine speed, altitude and atmospheric temperature, so that the diesel engine intake air preheating device of this invention has environmental adaptability and improves the cold start performance of the diesel engine. Attached Figure Description

[0037] 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.

[0038] Figure 1 This is one of the schematic flowcharts of the engine intake air preheating method provided in the embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram of the engine intake air preheating system provided in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the engine intake air preheating device provided in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram showing the installation location of the engine intake air preheating device provided in an embodiment of the present invention in a vehicle;

[0042] Figure 5 This is a second schematic flowchart of the engine intake air preheating method provided in the embodiments of the present invention;

[0043] Figure 6 This is a MAP diagram of the fuel injection frequency provided in an embodiment of the present invention;

[0044] Figure 7 This is a MAP diagram of the fuel injection pulse width provided in the embodiments of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention.

[0046] in:

[0047] 1-Diesel engine; 2-Engine exhaust pipe; 3-Turbocharger; 4-Speed ​​sensor;

[0048] 5-Fuel tank; 6-Electric fuel pump; 7-Intake air preheating indicator light; 8-Intake air pressure sensor;

[0049] 9-Intake air temperature sensor; 10-Engine intake air preheating device; 11-Engine intake manifold;

[0050] 12-Intercooler; 13-Engine controller (ECU);

[0051] 14-Intake preheating switch and engine switch; 15-Fuel inlet;

[0052] 16-Preheating device housing; 17-Preheating device base; 18-Heating rod protective sleeve;

[0053] 19-Heating rod; 20-Electronic fuel injector nozzle; 21-Injector and heating rod drive board;

[0054] 22-Electronic fuel injector; 23-Power supply and communication connector. Detailed Implementation

[0055] 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.

[0056] Figure 1 This is a schematic flowchart of the engine intake air preheating method provided in an embodiment of the present invention.

[0057] like Figure 1 As shown, this embodiment provides an engine intake air preheating method, including:

[0058] After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected.

[0059] If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by the heating rod, and fuel is injected onto the surface of the heating rod based on a pre-built MAP. The MAP is the correspondence between atmospheric pressure, ambient temperature, engine speed and injection frequency and injection pulse width, where injection frequency and injection pulse width characterize the injection rate of the injector.

[0060] After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0061] In practical applications, the MAP diagram can be determined based on existing technologies. Specifically, it can be obtained based on existing technologies by obtaining the theoretical intake preheating power corresponding to different atmospheric pressure values, ambient temperature values, and engine speeds. Then, the fuel supply rate can be calculated based on the intake preheating power, and the injection frequency and injection pulse width can be determined based on different injectors.

[0062] In an exemplary embodiment, injecting fuel onto the surface of a heating rod based on a pre-constructed MAP map includes:

[0063] The first injection frequency and the first injection pulse width are determined based on the ambient temperature and atmospheric pressure values ​​in a pre-constructed MAP map.

[0064] Fuel is injected onto the surface of the heating rod based on the first injection frequency and the first injection pulse width.

[0065] In an exemplary embodiment, the engine speed is collected; if the engine speed is higher than a first set speed, the engine intake preheating is completed, including:

[0066] The engine speed is collected in real time. If the engine speed is not higher than the first set speed, the second injection frequency and the second injection pulse width are determined in the pre-constructed MAP based on the ambient temperature, atmospheric pressure and engine speed.

[0067] Fuel is injected onto the surface of the heating rod based on the second injection frequency and the second injection pulse width.

[0068] If the engine speed is higher than the first set speed, fuel injection will stop.

[0069] In an exemplary embodiment, it also includes:

[0070] If the engine speed is lower than the second set speed, fuel injection will stop.

[0071] In an exemplary embodiment, it also includes:

[0072] The timing of fuel injection is recorded. If fuel injection continues for more than the first time, fuel injection is stopped.

[0073] In an exemplary embodiment, it also includes:

[0074] If the ambient temperature is greater than or equal to 0 degrees Celsius, the engine speed is detected. If the engine speed is less than the third set speed and the duration exceeds the second time, the engine intake preheating is not performed.

[0075] The engine intake preheating system provided by the present invention is described below. The engine intake preheating system described below and the engine intake preheating method described above can be referred to in correspondence.

[0076] Figure 2 This is a schematic diagram of the engine intake preheating system provided in an embodiment of the present invention.

[0077] like Figure 2 As shown, the engine intake air preheating system provided in this embodiment includes:

[0078] Data acquisition module 201 is used to acquire ambient temperature and atmospheric pressure values ​​after the engine is powered on;

[0079] The fuel injection module 202 is used to heat the air entering the engine through the heating rod if the ambient temperature is less than 0 degrees Celsius, and inject fuel onto the surface of the heating rod based on a pre-built MAP map. The MAP map shows the correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width, where the fuel injection frequency and fuel injection pulse width characterize the fuel injection rate of the fuel injector.

[0080] The preheating completion module 203 is used to collect the engine speed after the engine is started. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0081] The specific implementation method of the engine intake preheating system provided in this embodiment can be implemented with reference to the above embodiment, and will not be repeated here.

[0082] Figure 3 This is a schematic diagram of the engine intake preheating device provided in an embodiment of the present invention.

[0083] like Figure 3 As shown, the present invention also provides an engine intake air preheating device, comprising:

[0084] A control component for performing the engine intake air preheating method of any of the above embodiments;

[0085] A heating rod, electrically connected to a control component, is used to heat air under the control of the control component;

[0086] An electronic fuel injector, electrically connected to a control unit, is used to spray fuel onto a heating rod under the control of the control unit.

[0087] The communication connector is electrically connected to the control components and is used for communication between the control components and the engine.

[0088] Specifically, the engine intake preheating device provided in this embodiment mainly consists of a fuel inlet 15, a power supply and communication connector 23, a preheating device housing 16, a preheating device base 17, a heating rod 19, a heating rod protective sleeve 18, an electronic fuel injector 22, an electronic fuel injector nozzle 20, and a fuel injector and heating rod drive plate 21. Its working principle is as follows: power and control signals are supplied to the fuel injector and heating rod drive plate 21 via the power supply and communication connector 23. Under the drive of the fuel injector and heating rod drive plate 21, the surface temperature of the heating rod 19 rises rapidly after being energized. Fuel enters the electronic fuel injector 22 from the fuel inlet 15 and is injected onto the heating rod 19 at a specified injection frequency and pulse width from the electronic fuel injector nozzle 20. The fuel is then ignited by the heating rod 19 to heat the air in the engine intake manifold, thereby increasing the engine intake air temperature.

[0089] In an exemplary embodiment, the engine intake air preheating device is disposed on the engine intake passage.

[0090] This application also provides a diesel engine for intake preheating using the engine intake preheating method of any of the above embodiments.

[0091] Figure 4 This is a schematic diagram showing the installation location of the engine intake preheating device provided in an embodiment of the present invention in a vehicle.

[0092] like Figure 4 As shown, the diesel engine 1 is connected to the engine exhaust pipe 2, and further connected to the turbocharger 3. The engine intake preheating device provided in this application is arranged on the intake pipe between the intercooler 12 and the engine intake pipe 11 of the diesel engine 1. After being sealed by the lower end face of the preheating device base 17 and the engine intake pipe 11, the heating rod 19 and the heating rod protective sleeve 18 are inserted into the engine intake pipe, and the electronic fuel injector nozzle 20 is also placed in the engine intake pipe. Diesel fuel is pressurized from the fuel tank 5 by the electric fuel pump 6 and enters the fuel inlet 15 to supply fuel to the engine intake preheating device. The engine controller ECU 13 collects signals from the intake pressure sensor 8, intake temperature sensor 9, and engine speed sensor 4 on the intake manifold, and receives signals from the intake preheating switch and engine switch 14 to control the start and stop of the electric fuel pump 6 and the intake preheating indicator light 7. It also sends signals to the injector and heating rod drive board 21 in the engine intake preheating device 10 through the power supply and communication connector 23 to control the start and stop of the heating rod 19 and the electronic fuel injector 22.

[0093] The engine intake preheating method provided in this application will be further described in detail below, taking into account the engine intake preheating device provided in this application and the peripheral equipment connected in the vehicle:

[0094] Figure 5This is the second schematic flowchart of the engine intake preheating method provided in the embodiments of the present invention.

[0095] Figure 6 This is a MAP diagram of the fuel injection frequency provided in an embodiment of the present invention.

[0096] Figure 7 This is a MAP diagram of the fuel injection pulse width provided in an embodiment of the present invention.

[0097] like Figure 5 and Figure 6 As shown, the engine intake air preheating method provided in this embodiment includes the following steps:

[0098] Step 1: Power supply begins. The fuel injector and heating rod drive plate 21 in the engine intake preheating device 10 and the engine controller ECU 13 are simultaneously powered on.

[0099] Step 2, Data Communication. The engine controller ECU 13 collects signals from the intake air pressure sensor 8, intake air temperature sensor 9, and engine speed sensor 4. After power is supplied for 6 seconds, it continues to collect intake air pressure and intake air temperature values ​​for 1 second and takes the average value to determine the atmospheric temperature and atmospheric pressure of the engine's environment.

[0100] Step 3: Determine whether air intake preheating is required based on whether the average intake air temperature is less than 0℃.

[0101] Step 4: When the intake air temperature is below 0℃, execute the following workflow:

[0102] Step 4-1: The engine controller ECU 13 controls the intake air preheating indicator 7 to flash slowly (1 Hz frequency) to indicate that intake air preheating needs to be turned on before the engine can be started. At the same time, the engine controller ECU 13 controls the electric fuel pump 6 to start and supply fuel to the intake air preheating device.

[0103] Step 4-2: Wait for the driver to turn on the intake preheating switch. Once the intake preheating switch is turned on, the engine controller ECU13 will keep the intake preheating indicator light 7 constantly lit, proceeding to step six.

[0104] Step 5: When the intake air temperature is greater than or equal to 0℃, execute the following workflow:

[0105] Step 5-1: Intake preheating indicator 7 is not lit;

[0106] In step 5-2, if the driver engages first gear and the engine speed is less than 10 rpm for more than 10 seconds, the engine controller ECU 13 will determine that it has entered the "forced preheating" program and proceed to step six. Otherwise, the intake preheating device will not work.

[0107] Step six: The intake preheating device begins to operate. The engine controller ECU 13 controls the intake preheating indicator light 7 to remain constantly lit, the heating rod 19 starts heating with its positive and negative terminals connected, and the engine controller ECU 13 controls the electric fuel pump 6 to continue operating.

[0108] Step 7: After the heating rod 19 heats for 90 seconds, the engine controller ECU 13 starts to use the collected intake air pressure and intake air temperature, and queries the MAP diagram of the intake air preheating injection frequency and pulse width at 0 rpm (see...). Figure 6 and Figure 7 The system sends a signal to the injector and heating rod drive plate 21 in the engine intake preheating device 10 via the power supply and communication connector 23 to control the electronically controlled injector 22 to inject fuel onto the surface of the heating rod 19 at the corresponding injection frequency and pulse width, and the intake preheating device enters the "pre-ignition state".

[0109] Step 8: After the fuel injection is turned on for 5 seconds, the indicator light will flash rapidly (5 Hz frequency) for 30 seconds, indicating that the intake preheating device has finished preheating.

[0110] Step nine: The driver turns on the start switch to start the engine. When the engine controller ECU 13 collects an RPM signal higher than 10 rpm, the engine controller ECU 13 queries the MAP diagram of the intake air preheating injection frequency and pulse width in real time based on the collected intake air pressure, intake air temperature, and RPM (see...). Figure 6 and Figure 7 The engine intake preheating device 10 sends a signal to the injector and heating rod drive board 21 via the power supply and communication connector 23 to control the electronically controlled injector 22 to inject fuel onto the surface of the heating rod 19 at the corresponding injection frequency and pulse width, and the intake preheating device enters the "operating state"; if the driver does not turn on the start switch to start the engine during the 30-second period of the indicator light flashing rapidly (the engine controller ECU 13 collects the speed signal below 10 rpm), then proceed to step eleven.

[0111] Step 10: If the intake preheating device runs continuously for more than 5 minutes after the monitored speed value is higher than 10 rpm, or the speed is higher than 1100 rpm, or the speed is lower than 50 rpm, then proceed to Step 11. Otherwise, continue operating.

[0112] Step 11: The intake preheating device stops working. The engine controller ECU 13 controls the injector and heater rod drive board 21 to disconnect the power supply to the heater rod and the injector via the power supply and communication connector 23. At the same time, the engine controller ECU 13 controls the intake preheating indicator light to turn off and controls the electric fuel pump to stop rotating, thus stopping the intake preheating device from working.

[0113] Figure 8 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 8 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions in the memory 830 to execute the engine intake preheating method of any of the above embodiments, the method including:

[0114] After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected.

[0115] If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by the heating rod, and fuel is injected onto the surface of the heating rod based on a pre-built MAP. The MAP shows the correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width.

[0116] After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0117] Furthermore, the logical instructions in the aforementioned memory 830 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.

[0118] 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 perform the engine intake preheating method of any of the above embodiments, the method comprising:

[0119] After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected.

[0120] If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by the heating rod, and fuel is injected onto the surface of the heating rod based on a pre-built MAP. The MAP shows the correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width.

[0121] After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0122] 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 engine intake preheating method of any of the above embodiments, the method comprising:

[0123] After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected.

[0124] If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by the heating rod, and fuel is injected onto the surface of the heating rod based on a pre-built MAP. The MAP shows the correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width.

[0125] After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

[0126] 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.

[0127] 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.

[0128] 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. An engine intake air preheating method, characterized in that, include: After the engine is powered on, ambient temperature and atmospheric pressure values ​​are collected. If the ambient temperature is less than 0 degrees Celsius, the air entering the engine is heated by a heating rod, and fuel is injected onto the surface of the heating rod based on a pre-constructed MAP. The MAP is a correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width, where the fuel injection frequency and fuel injection pulse width characterize the fuel injection rate of the fuel injector. After starting the engine, the engine speed is collected. If the engine speed is higher than the first set speed, the engine intake preheating is completed. The process of collecting engine speed data, and if the engine speed is higher than a first set speed, completing engine intake preheating, includes: The engine speed is collected in real time. If the engine speed is not higher than the first set speed, the second injection frequency and the second injection pulse width are determined in the pre-constructed MAP based on the ambient temperature value, the atmospheric pressure value and the engine speed. Fuel is injected onto the surface of the heating rod based on the second injection frequency and the second injection pulse width. If the engine speed is higher than the first set speed, fuel injection will stop.

2. The engine intake air preheating method according to claim 1, characterized in that, The process of injecting fuel onto the surface of the heating rod based on a pre-constructed MAP map includes: The first injection frequency and the first injection pulse width are determined in the pre-constructed MAP based on the ambient temperature value and the atmospheric pressure value. Fuel is injected onto the surface of the heating rod based on the first injection frequency and the first injection pulse width.

3. The engine intake air preheating method according to claim 1, characterized in that, Also includes: If the engine speed is lower than the second set speed, fuel injection will stop.

4. The engine intake air preheating method according to claim 1, characterized in that, Also includes: The timing of fuel injection is recorded. If fuel injection continues for more than the first time, fuel injection is stopped.

5. The engine intake air preheating method according to claim 1, characterized in that, Also includes: If the ambient temperature is greater than or equal to 0 degrees Celsius, the engine speed is detected. If the engine speed is less than the third set speed and the duration exceeds the second time, engine intake preheating is not performed.

6. An engine intake air preheating system, using the engine intake air preheating method according to any one of claims 1-5, characterized in that, include: The data acquisition module is used to collect ambient temperature and atmospheric pressure values ​​after the engine is powered on; A fuel injection module is used to heat the air entering the engine through a heating rod if the ambient temperature is less than 0 degrees Celsius, and to inject fuel onto the surface of the heating rod based on a pre-built MAP. The MAP is a correspondence between atmospheric pressure, ambient temperature, engine speed and fuel injection frequency and fuel injection pulse width, wherein the fuel injection frequency and fuel injection pulse width characterize the fuel injection rate of the injector. The preheating completion module is used to collect the engine speed after the engine is started. If the engine speed is higher than the first set speed, the engine intake preheating is completed.

7. An engine intake air preheating device, characterized in that, include: A control component for performing the engine intake air preheating method according to any one of claims 1-5; A heating rod, electrically connected to the control component, is used to heat air under the control of the control component; An electronically controlled fuel injector, electrically connected to the control component, is used to spray fuel onto the heating rod under the control of the control component. A communication connector is electrically connected to the control component for communication between the control component and the engine.

8. The engine intake air preheating device according to claim 7, characterized in that, It is installed in the engine's air intake passage.

9. A diesel engine, characterized in that, The engine intake preheating method according to any one of claims 1-5 is used for intake preheating.

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