Engine intake preheating control system and method

Abstract

The invention provides an engine air inlet preheating control system and method, and belongs to the technical field of engine starting control. The engine controller is connected with an environment temperature sensor, an environment pressure sensor, an engine oil temperature sensor, an air inlet temperature sensor, an air inlet preheater and an instrument panel. The engine controller judges whether to preheat engine inlet air or not according to data collected by the environment temperature sensor, the environment pressure sensor, the engine oil temperature sensor and the inlet air temperature sensor and determines the target inlet air temperature for preheating the engine inlet air. And then an air inlet preheater is controlled to preheat the inlet air of the engine according to the target air inlet temperature, and meanwhile, a driver is informed to start the engine through an instrument panel after preheating is completed. Accurate control over the air inlet preheating process is achieved, the starting success rate of the engine in the low-temperature environment is increased, and unnecessary energy waste and part damage are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of engine start control, and in particular relates to an engine intake air preheating control system and method. Background Art

[0002] In cold regions, vehicle engines are difficult to start in low-temperature environments due to factors such as poor fuel atomization, poor oil fluidity, low cylinder wall temperature, and difficulty in cold starting the exhaust system. Specifically, the viscosity of the fuel increases at low temperatures, making it difficult to atomize, resulting in incomplete combustion, reduced engine power, and even starting failure; the oil becomes viscous and has poor fluidity at low temperatures, making it difficult to effectively lubricate the internal parts of the engine, increasing the risk of wear of the parts; the low cylinder wall temperature makes it difficult to ignite the mixture in the cylinder, further increasing the difficulty of starting; the exhaust system may also cause poor exhaust at low temperatures, affecting the normal operation of the engine. Therefore, in cold regions, the intake temperature needs to be preheated to improve the atomization effect of the fuel, improve the fluidity of the oil, and increase the cylinder wall temperature, thereby ensuring that the engine can start smoothly in a low-temperature environment.

[0003] Traditional engine intake preheating control methods usually use open-loop control, that is, setting a fixed heating time based on the ambient temperature. However, this method has many problems, such as insufficient heating heat or excessive heating. If the heating heat is insufficient, it will cause difficulty in starting the engine; if it is overheated, on the one hand, it will cause waste of battery power, and on the other hand, it will cause high-temperature damage to the intake pipe; in addition, environmental factors such as ambient pressure and oil temperature also have a significant impact on engine starting, but traditional starting control methods do not take these factors into account. Summary of the invention

[0004] In a first aspect, an embodiment of the present application provides an engine intake air preheating control system, including an engine controller; The engine controller is connected to an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake air temperature sensor, an intake air preheater and an instrument panel; The engine controller determines whether to preheat the engine intake air based on the data collected by the ambient temperature sensor, ambient pressure sensor, oil temperature sensor and intake air temperature sensor, and determines the target intake air temperature for preheating the engine intake air. It then controls the intake air preheater to preheat the engine intake air according to the target intake air temperature, and notifies the driver to start the engine through the instrument panel after the preheating is completed. By comprehensively considering multiple factors such as ambient temperature, ambient pressure, oil temperature and intake air temperature, it accurately determines whether the engine intake air needs to be preheated and determines the target temperature for preheating, thereby effectively improving the success rate of engine startup in low temperature environments and avoiding unnecessary energy waste and component damage.

[0005] Furthermore, it also includes a battery; The battery powers the engine controller and the intake air preheater.

[0006] Further, an ambient temperature sensor and an ambient pressure sensor are arranged outside the engine; The oil temperature sensor is arranged in the oil pipeline connected to the engine; The intake air temperature sensor is arranged at the inlet of the engine intake pipe; The intake air preheater is arranged in the engine intake pipe and is arranged near the inlet of the engine intake pipe. The battery provides a stable power supply for the system, ensuring that the intake air preheater and other electronic components can work normally, thereby enhancing the reliability and stability of the system.

[0007] Further, the intake air preheater includes a heating controller, a heating resistor, a timing unit and a current detection unit; The heating controller is connected to the heating resistance wire, the timing unit and the current detection unit; The heating controller receives the instruction from the engine controller and controls the opening and closing of the heating function of the heating resistor wire; A timing unit, used for timing the working time of the heating resistance wire; A current detection unit, used for detecting the current in the heating resistance wire; The heating controller is used to notify the engine controller to shut down the heating resistor when the working time exceeds the upper limit of the heating time, identify the current failure of the heating resistor, and notify the engine controller. The reasonable layout of the sensor and the intake air preheater ensures the accuracy of the data and the heating efficiency, and improves the overall performance of the system.

[0008] In a second aspect, an embodiment of the present application further provides an engine intake air preheating control method, comprising the following steps: S1. The engine controller determines the target intake temperature of the engine according to the ambient temperature; S2. The engine controller determines a correction factor according to the oil temperature and the ambient pressure, and uses the correction factor to correct the target intake air temperature; S3. The engine controller controls the intake air preheater to preheat the engine intake air until the corrected target intake air temperature is met; S4. The engine controller notifies the driver to start the engine through the dashboard. By comprehensively considering multiple factors, precise control of the engine intake preheating process is achieved, improving the engine's starting performance in a low-temperature environment.

[0009] Furthermore, the specific steps of step S1 are as follows: S11. The engine controller collects the ambient temperature through the ambient temperature sensor; S12. The engine controller determines whether the ambient temperature is lower than the ambient temperature threshold; If yes, go to step S13; If not, proceed to step S4; S13. The engine controller determines the target intake temperature of the engine by looking up a table according to the ambient temperature. By judging whether the ambient temperature is lower than a threshold value, unnecessary heating is avoided when preheating is not required, thus saving energy.

[0010] Furthermore, before step S11, the following steps are also included: SS1. Save the ambient temperature threshold in the engine controller in advance; SS2. A target intake temperature changes with the ambient temperature and a target intake temperature mapping table is stored in the engine controller in advance; In step S13, the engine controller searches the ambient temperature-target intake air temperature mapping table according to the ambient temperature, and then determines the required target intake air temperature. The target intake air temperature can be determined quickly and accurately through the pre-stored mapping table, which improves the response speed and accuracy of the system.

[0011] Furthermore, the specific steps of step S2 are as follows: S21. A correction coefficient is stored in the engine controller in advance, and a correction coefficient mapping table of ambient pressure-oil temperature-correction coefficient changes with the oil temperature and ambient pressure is stored; S22. The engine controller obtains the oil temperature through the oil temperature sensor and obtains the ambient pressure according to the ambient pressure sensor; S23. The engine controller searches the ambient pressure-oil temperature-correction coefficient mapping table according to the oil temperature and ambient pressure to determine the correction coefficient; S24. The engine controller uses the determined correction coefficient to correct the determined target intake temperature of the engine to obtain a corrected target intake temperature. By correcting the target intake temperature by the correction coefficient, the accuracy of the preheating control is further improved, and the starting requirements under different oil temperatures and ambient pressures are adapted.

[0012] Furthermore, the specific steps of step S3 are as follows: S31. The engine controller controls the intake air preheater to start; S32. The engine controller collects the intake air temperature through the intake air temperature sensor; S33. The engine controller determines whether the intake air temperature is less than the corrected target intake air temperature; If yes, go to step S34; If not, proceed to step S35; S34. The engine controller controls the intake air preheater to maintain the heating state, and returns to step S32; S35. The engine controller controls the intake air preheater to stop working, and enters step S4. By collecting the intake air temperature in real time and making a judgment, dynamic control of the heating process is achieved, ensuring that heating can be stopped in time after the intake air temperature reaches the target value.

[0013] Furthermore, step S34 also includes the following steps: SA1. The timing unit of the intake air preheater times the working time of the heating resistor and provides it to the heating controller; SA2. The heating controller determines whether the working time exceeds the upper limit of the heating time; If yes, go to step SA3; If not, proceed to step SA4; SA3. The heating controller determines that the engine controller is faulty, cuts off the circuit of the heating resistor, and stops heating; SA4. The current detection unit of the air intake heater collects the working current of the heating resistor and provides it to the heating controller; SA5. Heating controller identifies the working current; When the operating current exceeds the current upper limit, enter step SA6; When the operating current is lower than the current lower limit and is not 0, go to step SA7; When the operating current is 0, go to step SA8; SA6. The heating controller cuts off the heating resistor and reports the excessive current fault to the engine controller, ending; SA7. The heating controller cuts off the heating resistor and reports the low current fault to the engine controller, ending; SA8. The heating controller reports the failure of heating to the engine controller. By detecting and judging the working time and working current, it effectively prevents overheating and current failure of the heating resistor, improves the safety and reliability of the system, and effectively avoids the phenomenon of overheating due to uncontrolled heating when the engine controller fails.

[0014] It can be seen from the above technical solutions that the present invention has the following advantages: In the engine intake preheating control system and method provided by the present application, precise control of the intake preheating process is achieved by comprehensively considering the factors that affect the engine start-up, such as the ambient temperature, ambient pressure, oil temperature, and intake temperature, which not only improves the success rate of the engine start-up in a low-temperature environment, but also avoids unnecessary energy waste and component damage. At the same time, the reliability and safety of the system are ensured through reasonable sensor layout and precise heating control. In addition, the present application also has good adaptability and scalability, and can be flexibly adjusted according to different environmental conditions and engine states, providing a guarantee for the stable operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of an embodiment of an engine intake air preheating control system of the present invention.

[0017] Figure 2 It is a schematic diagram of another embodiment of the engine intake air preheating control system of the present invention.

[0018] Figure 3 The figure is a flow chart of an embodiment of the engine intake air preheating control method of the present invention.

[0019] Figure 4 This is a flow chart of another embodiment of the engine intake air preheating control method of the present invention.

[0020] Figure 5 Schematic diagram of the ambient temperature-target intake air temperature mapping in the engine controller of the present invention.

[0021] Figure 6 Schematic diagram of the ambient pressure-oil temperature-correction factor mapping in the engine controller of the present invention. DETAILED DESCRIPTION

[0022] The engine intake air preheating control system will be described in detail below, and various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives that fall within the spirit and scope of the various embodiments of the present disclosure.

[0023] For example, in extremely cold areas, vehicle engines face multiple low-temperature starting problems. Due to the sudden drop in temperature, the viscosity of the fuel increases significantly, making it difficult to effectively atomize, which not only reduces combustion efficiency, but also weakens the engine's output power, and in extreme cases may even lead to starting failure. At the same time, the engine oil becomes extremely viscous in a low-temperature environment, and its fluidity is greatly reduced, making it impossible to fully lubricate the various components inside the engine, thereby exacerbating the wear of the parts. In addition, it is difficult for the cylinder wall to reach the ideal ignition temperature at low temperatures, making it difficult for the mixed gas in the cylinder to be effectively ignited, which undoubtedly increases the difficulty of starting. The exhaust system may also have problems with poor exhaust under low-temperature conditions, further affecting the normal operation of the engine.

[0024] To meet these challenges, it is particularly important to preheat the engine intake air in cold regions. Preheating can improve the atomization quality of the fuel, improve the fluidity of the engine oil, and increase the temperature of the cylinder wall, thereby ensuring that the engine can start smoothly under low temperature conditions.

[0025] However, the traditional engine intake preheating control method adopts an open-loop control strategy, that is, a fixed heating time is set only according to the ambient temperature. This method has many disadvantages. On the one hand, if the heating heat is insufficient, the engine will be difficult to start; on the other hand, if it is overheated, it will not only waste the battery power, but also cause high temperature damage to the intake pipe. More importantly, the traditional control method ignores the impact of other environmental factors on engine starting, such as ambient pressure and oil temperature, which also have a significant impact on the engine's starting performance.

[0026] Therefore, we need a smarter and more accurate engine intake preheating control method to better adapt to the environmental conditions in cold areas and ensure that the engine can start stably and efficiently in low temperature environments.

[0027] In response to the above problems, the present embodiment provides an engine intake air preheating control system, which can comprehensively consider multiple factors such as ambient temperature, ambient pressure, oil temperature and intake air temperature, accurately determine whether the engine intake air needs to be preheated, and determine the preheating target temperature, thereby effectively improving the engine starting success rate in a low temperature environment, while avoiding unnecessary energy waste and engine component damage.

[0028] Hereinafter, the terms "include" or "may include" used in various embodiments of the present disclosure indicate the presence of disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present disclosure, the terms "include", "have", and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components, or a combination of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or a combination of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or a combination of the foregoing.

[0029] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 Shown is a schematic diagram of an engine intake air preheating control system in a specific embodiment, the system includes an engine controller; The engine controller is connected to an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake air temperature sensor, an intake air preheater and an instrument panel; The engine controller determines whether to preheat the engine intake air and determines the target intake air temperature for preheating the engine intake air based on the data collected by the ambient temperature sensor, the ambient pressure sensor, the oil temperature sensor and the intake air temperature sensor, and then controls the intake air preheater to preheat the engine intake air according to the target intake air temperature, and notifies the driver to start the engine through the instrument panel after the preheating is completed; It should be noted that the intake air preheater is closed-loop controlled based on the intake air temperature to ensure that the energy can meet the normal engine start-up requirements and no energy is wasted. The driver is prompted to start the engine in time through the instrument panel after the intake air heating is completed to prevent heat loss due to long-term non-startup. The engine controller can collect data through various sensors, and control the execution of corresponding actions through pre-stored strategies and data-side decisions, thereby realizing automatic control of engine intake preheating, and the present application can be applied to engines with different configurations.

[0032] In this embodiment, by integrating multi-dimensional data such as ambient temperature, ambient pressure, oil temperature and intake temperature, it is possible to intelligently judge the engine intake preheating requirements and accurately set the preheating target temperature, significantly improving the engine starting performance in cold areas while reducing unnecessary energy consumption and component wear.

[0033] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another engine intake air preheating control system is provided, such as Figure 2 As shown, the system includes an engine controller; The engine controller is connected to an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake air temperature sensor, an intake air preheater and an instrument panel; The engine controller determines whether to preheat the engine intake air and determines the target intake air temperature for preheating the engine intake air based on the data collected by the ambient temperature sensor, the ambient pressure sensor, the oil temperature sensor and the intake air temperature sensor, and then controls the intake air preheater to preheat the engine intake air according to the target intake air temperature, and notifies the driver to start the engine through the instrument panel after the preheating is completed; Also includes batteries; The battery powers the engine controller and the intake air preheater; It should be noted that the battery provides stable and reliable power support for the system, ensuring that key components such as the intake air preheater can work continuously and efficiently, enhancing the stability and durability of the entire control system, and the battery power can be charged and discharged through the engine intake air preheating control to prevent energy waste; The ambient temperature sensor and the ambient pressure sensor are arranged outside the engine; The oil temperature sensor is arranged in the oil pipeline connected to the engine; The intake air temperature sensor is arranged at the inlet of the engine intake pipe; The intake air preheater is arranged in the engine intake pipe and is arranged near the inlet of the engine intake pipe; It should be noted that the precise setting of relevant sensors and intake air preheaters makes data collection more accurate and heating efficiency higher, further improving the success rate of engine starting in low temperature environments; The intake air preheater includes a heating controller, a heating resistor, a timing unit and a current detection unit; The heating controller is connected to the heating resistance wire, the timing unit and the current detection unit; The heating controller receives the instruction from the engine controller and controls the opening and closing of the heating function of the heating resistor wire; A timing unit, used for timing the working time of the heating resistance wire; The timing of the heating resistor wire is to prevent the heating from not stopping when the engine controller fails, thus causing overheating and further causing damage to engine components. A current detection unit, used for detecting the current in the heating resistance wire; A heating controller, used to notify the closing of the heating resistor wire when the working time exceeds the upper limit of the heating time, and to identify the current failure of the heating resistor wire and notify the engine controller; It should be noted that through the coordinated work of the heating controller, heating resistor, timing unit and current detection unit, precise control of the heating process is achieved, effectively avoiding engine start controller failure and current failure, and improving the safety and reliability of the system.

[0034] like Figure 3 As shown, the following is an embodiment of the engine intake preheating control method provided by the embodiment of the present disclosure. This method and the engine intake preheating control system of the above-mentioned embodiments belong to the same inventive concept. For details not described in detail in the embodiment of the engine intake preheating control method, reference can be made to the above-mentioned embodiment of the engine intake preheating control system.

[0035] The method comprises the following steps: S1. The engine controller determines the target intake temperature of the engine according to the ambient temperature; S2. The engine controller determines a correction factor according to the oil temperature and the ambient pressure, and uses the correction factor to correct the target intake air temperature; S3. The engine controller controls the intake air preheater to preheat the engine intake air until the corrected target intake air temperature is met; S4. The engine controller notifies the driver through the instrument panel to start the engine.

[0036] This embodiment comprehensively considers multiple factors that affect engine starting, and achieves dynamic optimization of the engine intake preheating process by intelligently adjusting the preheating strategy, thereby significantly improving the engine starting efficiency in a low-temperature environment.

[0037] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another engine intake air preheating control method is provided, such as Figure 4 As shown, the following steps are included: S1. The engine controller determines the target intake temperature of the engine according to the ambient temperature; the specific steps of step S1 are as follows: Before step S11, the following steps are also included: SS1. Save the ambient temperature threshold in the engine controller in advance; SS2. A mapping table of ambient temperature-target intake air temperature with target intake air temperature changing with ambient temperature is stored in the engine controller in advance; the ambient temperature-target intake air temperature mapping table is as follows: Figure 5 As shown; It should be noted that the target intake air temperature can be quickly and accurately calculated through the pre-saved mapping table, which improves the response speed and calculation accuracy of the system; S11. The engine controller collects the ambient temperature through the ambient temperature sensor; S12. The engine controller determines whether the ambient temperature is lower than the ambient temperature threshold; If yes, go to step S13; If not, proceed to step S4; S13. The engine controller determines the target intake temperature of the engine according to the ambient temperature table; It should be noted that by judging whether the ambient temperature is lower than the preset threshold, it can intelligently decide whether to start the preheating program, thus avoiding unnecessary energy consumption and component wear, and improving the energy saving and economy of the system; In step S13, the engine controller searches the ambient temperature-target intake air temperature mapping table according to the ambient temperature, and then determines the required target intake air temperature; S2. The engine controller determines a correction factor according to the oil temperature and the ambient pressure, and uses the correction factor to correct the target intake temperature; the specific steps of step S2 are as follows: S21. A correction coefficient is saved in advance in the engine controller. A correction coefficient mapping table of ambient pressure-oil temperature-correction coefficient changes with the oil temperature and ambient pressure; A correction coefficient mapping table of ambient pressure-oil temperature-correction coefficient is as follows. Figure 6 As shown; S22. The engine controller obtains the oil temperature through the oil temperature sensor and obtains the ambient pressure according to the ambient pressure sensor; S23. The engine controller searches the ambient pressure-oil temperature-correction coefficient mapping table according to the oil temperature and ambient pressure to determine the correction coefficient; S24. The engine controller uses the determined correction coefficient to correct the determined target intake temperature of the engine to obtain a corrected target intake temperature; It should be noted that by introducing a correction factor, the target intake temperature is dynamically adjusted to meet the starting requirements under different oil temperatures and ambient pressures, further improving the adaptability and flexibility of the system; S3. The engine controller controls the intake air preheater to preheat the engine intake air until the corrected target intake air temperature is met; the specific steps of step S3 are as follows: S31. The engine controller controls the intake air preheater to start; S32. The engine controller collects the intake air temperature through the intake air temperature sensor; S33. The engine controller determines whether the intake air temperature is less than the corrected target intake air temperature; If yes, go to step S34; If not, proceed to step S35; S34. The engine controller controls the intake air preheater to maintain the heating state, and returns to step S32; S35. The engine controller controls the intake air preheater to stop working and proceeds to step S4; It should be noted that by collecting the intake air temperature in real time and making dynamic judgments, the heating process can be accurately controlled to ensure that heating can be stopped in time after the intake air temperature reaches the target value, thereby improving the control accuracy and energy efficiency of the system; S4. The engine controller notifies the driver through the instrument panel to start the engine.

[0038] In an embodiment of the present invention, based on step S34, a possible embodiment is given below to illustrate its specific implementation scheme in a non-limiting manner.

[0039] Step S34 also includes the following steps: SA1. The timing unit of the intake air preheater times the working time of the heating resistor and provides it to the heating controller; SA2. The heating controller determines whether the working time exceeds the upper limit of the heating time; If yes, go to step SA3; If not, proceed to step SA4; SA3. The heating controller determines that the engine controller is faulty, cuts off the circuit of the heating resistor, and stops heating; SA4. The current detection unit of the air intake heater collects the working current of the heating resistor and provides it to the heating controller; SA5. Heating controller identifies the working current; When the operating current exceeds the current upper limit, enter step SA6; When the operating current is lower than the current lower limit and is not 0, go to step SA7; When the operating current is 0, go to step SA8; SA6. The heating controller cuts off the heating resistor and reports the excessive current fault to the engine controller, ending; SA7. The heating controller cuts off the heating resistor and reports the low current fault to the engine controller, ending; SA8. The heating controller reports the failure of heating to the engine controller; It should be noted that by detecting the working time and current of the heating resistor wire, comprehensive monitoring of the heating process is achieved, overheating and current failures are effectively avoided, and the safety and stability of the system are improved.

[0040] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0041] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine intake air preheating control system, characterized in that: including an engine controller; The engine controller is connected to an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake air temperature sensor, an intake air preheater and an instrument panel; The engine controller determines whether to preheat the engine intake air and determines the target intake air temperature for preheating the engine intake air based on the data collected by the ambient temperature sensor, ambient pressure sensor, oil temperature sensor and intake air temperature sensor, and then controls the intake air preheater to preheat the engine intake air according to the target intake air temperature. At the same time, after the preheating is completed, the driver is notified through the instrument panel to start the engine.

2. The engine intake air preheating control system according to claim 1, characterized in that: Also includes batteries; The battery powers the engine controller and the intake air preheater.

3. The engine intake air preheating control system according to claim 1, characterized in that: The ambient temperature sensor and the ambient pressure sensor are arranged outside the engine; The oil temperature sensor is arranged in the oil pipeline connected to the engine; The intake air temperature sensor is arranged at the inlet of the engine intake pipe; The intake air preheater is arranged in the engine intake pipe and is arranged near the inlet of the engine intake pipe.

4. The engine intake air preheating control system according to claim 1, characterized in that: The intake air preheater includes a heating controller, a heating resistor, a timing unit and a current detection unit; The heating controller is connected to the heating resistance wire, the timing unit and the current detection unit; The heating controller receives the instruction from the engine controller and controls the opening and closing of the heating function of the heating resistor wire; A timing unit, used for timing the working time of the heating resistance wire; A current detection unit, used for detecting the current in the heating resistance wire; The heating controller is used to notify the shutdown of the heating resistor when the working time exceeds the upper limit of the heating time, and to identify the current failure of the heating resistor and notify the engine controller.

5. An engine intake air preheating control method, characterized in that: The steps include: S1. The engine controller determines the target intake temperature of the engine according to the ambient temperature; S2. The engine controller determines a correction factor according to the oil temperature and the ambient pressure, and uses the correction factor to correct the target intake air temperature; S3. The engine controller controls the intake air preheater to preheat the engine intake air until the corrected target intake air temperature is met; S4. The engine controller notifies the driver through the instrument panel to start the engine.

6. The engine intake air preheating control method according to claim 5, characterized in that: The specific steps of step S1 are as follows: S11. The engine controller collects the ambient temperature through the ambient temperature sensor; S12. The engine controller determines whether the ambient temperature is lower than the ambient temperature threshold; If yes, go to step S13; If not, proceed to step S4; S13. The engine controller determines the target intake temperature of the engine based on the ambient temperature by looking up a table.

7. The engine intake air preheating control method according to claim 6, characterized in that: Before step S11, the following steps are also included: SS1. Save the ambient temperature threshold in the engine controller in advance; SS2. A target intake temperature changes with the ambient temperature and a target intake temperature mapping table is stored in the engine controller in advance; In step S13, the engine controller searches the ambient temperature-target intake air temperature mapping table according to the ambient temperature, and further determines the required target intake air temperature.

8. The engine intake air preheating control method according to claim 7, characterized in that: The specific steps of step S2 are as follows: S21. A correction coefficient is stored in the engine controller in advance, and a correction coefficient mapping table of ambient pressure-oil temperature-correction coefficient changes with the oil temperature and ambient pressure is stored; S22. The engine controller obtains the oil temperature through the oil temperature sensor and obtains the ambient pressure according to the ambient pressure sensor; S23. The engine controller searches the ambient pressure-oil temperature-correction coefficient mapping table according to the oil temperature and ambient pressure to determine the correction coefficient; S24. The engine controller uses the determined correction coefficient to correct the determined target intake air temperature of the engine to obtain a corrected target intake air temperature.

9. The engine intake air preheating control method according to claim 8, characterized in that: The specific steps of step S3 are as follows: S31. The engine controller controls the intake air preheater to start; S32. The engine controller collects the intake air temperature through the intake air temperature sensor; S33. The engine controller determines whether the intake air temperature is less than the corrected target intake air temperature; If yes, go to step S34; If not, proceed to step S35; S34. The engine controller controls the intake air preheater to maintain the heating state, and returns to step S32; S35. The engine controller controls the intake air preheater to stop working and enters step S4.

10. The engine intake air preheating control method according to claim 9, characterized in that: Step S34 also includes the following steps: SA1. The timing unit of the intake air preheater times the working time of the heating resistor and provides it to the heating controller; SA2. The heating controller determines whether the working time exceeds the upper limit of the heating time; If yes, go to step SA3; If not, proceed to step SA4; SA3. The heating controller determines that the engine controller is faulty, cuts off the circuit of the heating resistor, and stops heating; SA4. The current detection unit of the air intake heater collects the working current of the heating resistor and provides it to the heating controller; SA5. Heating controller identifies the working current; When the operating current exceeds the current upper limit, enter step SA6; When the operating current is lower than the current lower limit and is not 0, go to step SA7; When the working current is 0, go to step SA8; SA6. The heating controller cuts off the heating resistor and reports the excessive current fault to the engine controller, ending; SA7. The heating controller cuts off the heating resistor and reports the low current fault to the engine controller, ending; SA8. The heating controller reports a non-heating fault to the engine controller.

Images