Engine intake air preheating control system and method

Abstract

The application provides an engine intake preheating control system and method, and belongs to the technical field of engine starting control.The system comprises an engine controller;the engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater and an instrument panel;the engine controller determines whether to preheat the engine intake according to the data collected by the ambient temperature sensor, the ambient pressure sensor, the oil temperature sensor and the intake temperature sensor, determines the target intake temperature for preheating the engine intake, and then controls the intake preheater to preheat the engine intake according to the target intake temperature, and notifies the driver to start the engine through the instrument panel after the preheating is completed.The application realizes accurate control of the intake preheating process, improves the starting success rate of the engine in a low-temperature environment, and avoids unnecessary energy waste and component damage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engine start control, and particularly relates to an engine intake preheating control system and method. BACKGROUND

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

[0003] Traditional engine intake preheating control methods usually use open-loop control, i.e., setting a fixed heating time based on the ambient temperature. However, this approach has many problems, such as insufficient or excessive heating. Insufficient heating will lead to difficulty in starting the engine, while excessive heating will cause waste of battery power and high-temperature damage to the intake pipeline. In addition, environmental factors such as ambient pressure and oil temperature also have a significant impact on engine start, but traditional start control methods do not consider these factors. SUMMARY

[0004] In a first aspect, the application provides an engine intake preheating control system, comprising an engine controller;

[0005] The engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater, and an instrument panel.

[0006] The engine controller determines whether to preheat the engine intake air according to the data collected by the ambient temperature sensor, the ambient pressure sensor, the engine oil temperature sensor and the intake air temperature sensor, determines the target intake air temperature for preheating the engine intake air, and controls the intake air preheater to preheat the engine intake air 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 the ambient temperature, ambient pressure, engine oil temperature and intake air temperature and other factors, it is accurately determined whether the engine intake air needs to be preheated, and the target temperature for preheating is determined, thereby effectively improving the starting success rate of the engine in low temperature environment, and avoiding unnecessary energy waste and component damage.

[0007] Further, it also includes a battery;

[0008] The battery supplies power to the engine controller and the intake air preheater.

[0009] Further, the ambient temperature sensor and the ambient pressure sensor are arranged outside the engine;

[0010] The engine oil temperature sensor is arranged in the engine oil pipeline connected to the engine;

[0011] The intake air temperature sensor is arranged at the inlet of the engine intake pipe;

[0012] The intake air preheater is arranged in the engine intake pipe and close to the inlet of the engine intake pipe. The battery provides stable power supply for the system, ensuring that the intake air preheater and other electronic components can work normally, and enhances the reliability and stability of the system.

[0013] Further, the intake air preheater includes a heating controller, a heating resistance wire, a timing unit and a current detection unit;

[0014] The heating controller is connected with the heating resistance wire, the timing unit and the current detection unit;

[0015] The heating controller receives the instructions of the engine controller to control the opening and closing of the heating function of the heating resistance wire;

[0016] The timing unit is used to time the working time of the heating resistance wire;

[0017] The current detection unit is used to detect the current in the heating resistance wire;

[0018] The heating controller is used to notify the closing of the heating resistance wire when the working time exceeds the upper limit of the heating time, and to identify the current fault of the heating resistance wire 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.

[0019] In a second aspect, the embodiments of the present application further provide an engine intake air preheating control method, comprising the following steps:

[0020] S1. An engine controller determines a target intake air temperature of an engine according to an ambient temperature;

[0021] S2. The engine controller determines a correction coefficient according to an oil temperature and an ambient pressure, and corrects the target intake air temperature using the correction coefficient;

[0022] S3. The engine controller controls an intake air preheater to preheat the engine intake air until the corrected target intake air temperature is met;

[0023] S4. The engine controller informs a driver to start the engine through an instrument panel. By comprehensively considering multiple factors, the embodiments of the present application achieve accurate control of the engine intake air preheating process, and improve the starting performance of the engine in a low-temperature environment.

[0024] Further, step S1 specifically comprises the following steps:

[0025] S11. The engine controller collects the ambient temperature through an ambient temperature sensor;

[0026] S12. The engine controller determines whether the ambient temperature is lower than an ambient temperature threshold value;

[0027] If yes, step S13 is entered;

[0028] If no, step S4 is entered;

[0029] S13. The engine controller determines the target intake air temperature of the engine according to the ambient temperature. By determining whether the ambient temperature is lower than the threshold value, unnecessary heating in the case where preheating is not needed is avoided, and energy is saved.

[0030] Further, step S11 further comprises the following steps:

[0031] SS1. An ambient temperature threshold value is pre-stored in the engine controller;

[0032] SS2. An ambient temperature-target intake air temperature mapping table in which a target intake air temperature changes with the ambient temperature is pre-stored in the engine controller;

[0033] In step S13, the engine controller looks up the ambient temperature-target intake air temperature mapping table according to the ambient temperature, and then determines the required target intake air temperature. By using the pre-stored mapping table, the target intake air temperature can be quickly and accurately determined, and the response speed and accuracy of the system are improved.

[0034] Further, step S2 specifically comprises the following steps:

[0035] S21. Pre-storing a correction coefficient ambient pressure-oil temperature-correction coefficient mapping table in the engine controller, which corrects the ambient pressure and the oil temperature;

[0036] S22. The engine controller acquires the oil temperature through the oil temperature sensor and acquires the ambient pressure through the ambient pressure sensor;

[0037] S23. The engine controller looks up the ambient pressure-oil temperature-correction coefficient mapping table according to the oil temperature and the ambient pressure to determine the correction coefficient;

[0038] S24. The engine controller corrects the determined target intake air temperature using the determined correction coefficient to obtain the corrected target intake air temperature. By correcting the target intake air temperature through 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.

[0039] Further, step S3 includes the following specific steps:

[0040] S31. The engine controller controls the intake air preheater to start;

[0041] S32. The engine controller acquires the intake air temperature through the intake air temperature sensor;

[0042] S33. The engine controller determines whether the intake air temperature is less than the corrected target intake air temperature;

[0043] If yes, go to step S34;

[0044] If no, go to step S35;

[0045] S34. The engine controller controls the intake air preheater to maintain the heating state, and returns to step S32;

[0046] S35. The engine controller controls the intake air preheater to stop working, and goes to step S4. By acquiring the intake air temperature in real time and making a judgment, dynamic control of the heating process is realized, and it is ensured that the intake air temperature can be stopped heating in time after reaching the target value.

[0047] Further, step S34 further includes the following steps:

[0048] SA1. The timing unit of the intake air preheater times the working time of the heating resistance wire and provides it to the heating controller;

[0049] SA2. The heating controller determines whether the working time exceeds the heating upper limit time;

[0050] If yes, go to step SA3;

[0051] If no, go to step SA4;

[0052] SA3. The heating controller determines that the engine controller has a fault, cuts off the circuit of the heating resistance wire, and stops heating;

[0053] SA4. The current detection unit of the air intake heater collects the working current of the heating resistance wire and provides it to the heating controller;

[0054] SA5. The heating controller identifies the working current;

[0055] When the working current exceeds the upper limit of the current, step SA6 is entered;

[0056] When the working current is lower than the lower limit of the current and is not 0, step SA7 is entered;

[0057] When the working current is 0, step SA8 is entered;

[0058] SA6. The heating controller cuts off the working of the heating resistance wire and reports a too large current fault to the engine controller, and the process ends;

[0059] SA7. The heating controller cuts off the working of the heating resistance wire and reports a too small current fault to the engine controller, and the process ends;

[0060] SA8. The heating controller reports a non-heating fault to the engine controller. Through detection and judgment of the working time and the working current, the overheat and current fault of the heating resistance wire are effectively prevented, the safety and reliability of the system are improved, and the phenomenon of over-heating due to uncontrolled heating when the engine controller fails is effectively avoided.

[0061] From the above technical solutions, the present application has the following advantages:

[0062] The engine air intake preheating control system and method provided in the present application comprehensively consider the environmental temperature, environmental pressure, oil temperature, and intake temperature factors that affect engine starting, accurately control the air intake preheating process, not only improve the success rate of engine starting in low-temperature environments, but also avoid unnecessary energy waste and component damage. At the same time, through reasonable sensor layout and accurate heating control, the reliability and safety of the system are ensured. In addition, the present application has good adaptability and scalability, can be flexibly adjusted according to different environmental conditions and engine states, and provides a guarantee for stable operation of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to make the technical solutions of the present application clearer, the drawings needed to be used in the description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0064] Figure 1 A schematic diagram of an embodiment of the engine intake air preheating control system of the present application.

[0065] Figure 2 A schematic diagram of another embodiment of the engine intake air preheating control system of the present application.

[0066] Figure 3 A flowchart of an embodiment of the engine intake air preheating control method of the present application.

[0067] Figure 4 A flowchart of another embodiment of the engine intake air preheating control method of the present application.

[0068] Figure 5 A mapping representation of the ambient temperature-target intake air temperature in the engine controller of the present application.

[0069] Figure 6 A mapping representation of the ambient pressure-oil temperature-correction coefficient in the engine controller of the present application. DETAILED DESCRIPTION

[0070] 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 can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives falling within the spirit and scope of various embodiments of the present disclosure.

[0071] Illustratively, in cold regions, vehicle engines face multiple low-temperature starting difficulties. Due to the sudden drop in air temperature, the viscosity of fuel increases significantly, making it difficult to effectively atomize, which not only reduces combustion efficiency, but also weakens the output power of the engine, and in extreme cases can even cause starting failure. At the same time, the oil becomes abnormally viscous in a low-temperature environment, with greatly reduced flowability, so it cannot fully lubricate the various parts inside the engine, further exacerbating the wear of the parts. In addition, the cylinder wall is difficult to reach the ideal ignition temperature in a low-temperature state, making it difficult for the mixture 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.

[0072] To address these challenges, it is particularly important to preheat the engine intake air in cold regions. Preheating can improve the quality of fuel atomization, improve the flowability of engine oil, and increase the temperature of the cylinder wall, thereby ensuring that the engine can start smoothly under low-temperature conditions.

[0073] However, traditional engine intake air preheating control methods use an open-loop control strategy, i.e., a fixed heating time is set based on the ambient temperature. This method has many drawbacks. 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, not only will the battery's power be wasted, but the intake air line may also be damaged by high temperature. More importantly, the traditional control method ignores other environmental factors that affect engine starting, such as ambient pressure and oil temperature, which also have a significant impact on the starting performance of the engine.

[0074] Therefore, we need a more intelligent and accurate engine intake air preheating control method to better adapt to the environmental conditions in cold regions and ensure that the engine can start stably and efficiently in low-temperature environments.

[0075] To address the above problems, the present embodiment provides an engine intake air preheating control system that can consider multiple factors such as ambient temperature, ambient pressure, oil temperature, and intake air temperature to accurately determine whether the engine intake air needs to be preheated and determine the target temperature for preheating, thereby effectively improving the starting success rate of the engine in low-temperature environments, while avoiding unnecessary energy waste and damage to engine components.

[0076] Hereinafter, the term "include" or "may include" used in various embodiments of the disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the disclosure, the terms "include", "have", and their synonyms merely mean to indicate the presence of a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as excluding the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0077] It should be noted that if a description connects one constituent element to another constituent element, the first constituent element can be directly connected to the second constituent element, and a third constituent element can be "connected" between the first constituent element and the second constituent element. Conversely, when one constituent element is "directly connected" to another constituent element, it can be understood that there is no third constituent element between the first constituent element and the second constituent element.

[0078] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0079] Please refer to Figure 1 Fig. 1 is a schematic diagram of an engine intake preheating control system in an embodiment, which comprises an engine controller;

[0080] The engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater and an instrument panel;

[0081] The engine controller determines whether to preheat the engine intake according to the data collected by the ambient temperature sensor, the ambient pressure sensor, the oil temperature sensor and the intake temperature sensor, determines the target intake temperature for preheating the engine intake, and controls the intake preheater to preheat the engine intake according to the target intake temperature, while informing the driver to start the engine through the instrument panel after the preheating is completed;

[0082] It should be noted that the intake preheater is controlled in a closed loop based on the intake temperature, so as to ensure that the energy can meet the needs of normal engine starting and will not cause waste of energy, and the driver is prompted to start the engine in time through the instrument panel after the intake heating is completed, so as to prevent heat loss for a long time;

[0083] The engine controller can collect data through various sensors, make decisions through pre-stored strategies and data on the left, and control corresponding actions to be performed, so as to realize automatic control of engine intake preheating, and the present application can be applied to engines with different configurations.

[0084] In the embodiment, the engine intake preheating demand can be intelligently determined and the preheating target temperature can be accurately set by integrating multi-dimensional data such as ambient temperature, ambient pressure, oil temperature and intake temperature, so as to significantly improve the starting performance of the engine in cold regions, while reducing unnecessary energy consumption and component wear.

[0085] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to completely describe the specific implementation process in the embodiment, another engine intake preheating control system is provided, as shown in Fig. 2, which comprises an engine controller; Figure 2 The engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater and an instrument panel;

[0086] The engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater and an instrument panel;

[0087] The engine controller determines whether to preheat the engine intake air according to the data collected by the ambient temperature sensor, the ambient pressure sensor, the engine oil temperature sensor, and the intake air temperature sensor, determines the target intake air temperature for preheating the engine intake air, and controls the intake air preheater to preheat the engine intake air to the target intake air temperature, while informing the driver to start the engine through the instrument panel after the preheating is completed;

[0088] The battery is also included;

[0089] The battery supplies power to the engine controller and the intake air preheater;

[0090] It should be noted that the battery provides stable and reliable power support for the system, ensuring that critical components such as the intake air preheater can work continuously and efficiently, enhancing the stability and durability of the entire control system, and preventing energy waste through engine intake air preheating control and battery power utilization;

[0091] The ambient temperature sensor and the ambient pressure sensor are arranged outside the engine;

[0092] The engine oil temperature sensor is arranged in the engine oil line connected to the engine;

[0093] The intake air temperature sensor is arranged at the inlet of the engine intake pipe;

[0094] The intake air preheater is arranged in the engine intake pipe, close to the inlet of the engine intake pipe;

[0095] It should be noted that the precise arrangement of the relevant sensors and the intake air preheater makes the data collection more accurate and the heating efficiency higher, further improving the success rate of engine starting in low temperature environment;

[0096] The intake air preheater includes a heating controller, a heating resistance wire, a timing unit, and a current detection unit;

[0097] The heating controller is connected to the heating resistance wire, the timing unit, and the current detection unit;

[0098] The heating controller receives instructions from the engine controller to control the opening and closing of the heating function of the heating resistance wire;

[0099] The timing unit is used to time the working time of the heating resistance wire;

[0100] Timing the heating resistance wire is to prevent the heating from stopping when the engine controller fails, causing over-heating and damage to engine components;

[0101] The current detection unit is used to detect the current in the heating resistance wire;

[0102] a heating controller for notifying to close the heating resistance wire when the working time exceeds the heating upper limit time, and identifying the current fault of the heating resistance wire, and notifying the engine controller;

[0103] It should be noted that through the cooperative work of the heating controller, the heating resistance wire, the timing unit and the current detection unit, the precise control of the heating process is realized, the engine start controller fault and the current fault are effectively avoided, and the safety and reliability of the system are improved.

[0104] As shown in Figure 3 The following is an embodiment of the engine intake preheating control method provided by the embodiment of the disclosure, which belongs to the same inventive concept as the engine intake preheating control system of each of the above embodiments. Details not described in the embodiment of the engine intake preheating control method can be referred to the above embodiment of the engine intake preheating control system.

[0105] The method comprises the following steps:

[0106] S1. The engine controller determines the target intake temperature of the engine according to the ambient temperature;

[0107] S2. The engine controller determines the correction coefficient according to the oil temperature and the ambient pressure, and corrects the target intake temperature using the correction coefficient;

[0108] S3. The engine controller controls the intake preheater to preheat the engine intake until the corrected target intake temperature is met;

[0109] S4. The engine controller notifies the driver to start the engine through the instrument panel.

[0110] This embodiment comprehensively considers multiple factors affecting the engine start, and realizes the dynamic optimization of the engine intake preheating process by intelligently adjusting the preheating strategy, which significantly improves the engine start efficiency in low temperature environment.

[0111] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to completely describe the specific implementation process in this embodiment, another engine intake preheating control method is provided, as shown in Figure 4 The method comprises the following steps:

[0112] 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:

[0113] Before step S11, the following steps are further included:

[0114] SS1. The ambient temperature threshold is pre-stored in the engine controller;

[0115] SS2. Pre-storing a target intake temperature vs. ambient temperature mapping table in the engine controller, which shows the change of the target intake temperature with the ambient temperature; Figure 5

[0116] It should be noted that the target intake temperature can be quickly and accurately calculated through the pre-stored mapping table, thereby improving the response speed and calculation accuracy of the system;

[0117] S11. The engine controller collects the ambient temperature through the ambient temperature sensor;

[0118] S12. The engine controller determines whether the ambient temperature is lower than the ambient temperature threshold;

[0119] If yes, go to step S13;

[0120] If no, go to step S4;

[0121] S13. The engine controller determines the target intake temperature of the engine according to the ambient temperature;

[0122] It should be noted that by determining whether the ambient temperature is lower than the pre-set threshold, it can be intelligently determined whether to start the preheating program, thereby avoiding unnecessary energy consumption and component wear, and improving the energy saving and economy of the system;

[0123] In step S13, the engine controller looks up the target intake temperature vs. ambient temperature mapping table according to the ambient temperature, and then determines the required target intake temperature;

[0124] S2. The engine controller determines the correction coefficient according to the oil temperature and the ambient pressure, and corrects the target intake temperature using the correction coefficient; the specific steps of step S2 are as follows:

[0125] S21. Pre-storing an ambient pressure-oil temperature-correction coefficient mapping table in the engine controller, which shows the change of the correction coefficient with the oil temperature and the ambient pressure; Figure 6

[0126] S22. The engine controller obtains the oil temperature through the oil temperature sensor, and obtains the ambient pressure according to the ambient pressure sensor;

[0127] S23. The engine controller looks up the ambient pressure-oil temperature-correction coefficient mapping table according to the oil temperature and the ambient pressure, and determines the correction coefficient;

[0128] S24. The engine controller corrects the determined target intake temperature of the engine using the determined correction coefficient, and obtains the corrected target intake temperature; ​​

[0129] It should be noted that by introducing the correction coefficient, 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.

[0130] S3. The engine controller controls the intake preheater to preheat the engine intake until the corrected target intake temperature is met; the specific steps of step S3 are as follows:

[0131] S31. The engine controller controls the intake preheater to start;

[0132] S32. The engine controller collects the intake temperature through the intake temperature sensor;

[0133] S33. The engine controller determines whether the intake temperature is less than the corrected target intake temperature;

[0134] If yes, go to step S34;

[0135] If no, go to step S35;

[0136] S34. The engine controller controls the intake preheater to maintain the heating state, and returns to step S32;

[0137] S35. The engine controller controls the intake preheater to stop working, and goes to step S4;

[0138] It should be noted that by collecting the intake temperature in real time and dynamically determining, the heating process can be accurately controlled, and the heating can be stopped in time after the intake temperature reaches the target value, improving the control precision and energy efficiency of the system;

[0139] S4. The engine controller informs the driver to start the engine through the instrument panel.

[0140] In an embodiment of the present application, based on step S34, a possible embodiment will be given below to non-restrictively describe the specific implementation scheme.

[0141] Step S34 further includes the following steps:

[0142] SA1. The timing unit of the intake preheater times the working time of the heating resistance wire and provides it to the heating controller;

[0143] SA2. The heating controller determines whether the working time exceeds the heating upper limit time;

[0144] If yes, go to step SA3;

[0145] If no, go to step SA4;

[0146] SA3. The heating controller determines that the engine controller is faulty, cuts off the circuit of the heating resistance wire, and stops heating;

[0147] SA4. The current detection unit of the air intake heater collects the working current of the heating resistance wire and provides it to the heating controller;

[0148] SA5. The heating controller identifies the working current;

[0149] When the working current exceeds the upper limit of the current, step SA6 is entered;

[0150] When the working current is lower than the lower limit of the current and is not 0, step SA7 is entered;

[0151] When the working current is 0, step SA8 is entered;

[0152] SA6. The heating controller cuts off the working of the heating resistance wire, reports a too large current fault to the engine controller, and ends;

[0153] SA7. The heating controller cuts off the working of the heating resistance wire, reports a too small current fault to the engine controller, and ends;

[0154] SA8. The heating controller reports a non-heating fault to the engine controller;

[0155] It should be noted that by detecting the working duration and current of the heating resistance wire, comprehensive monitoring of the heating process is achieved, overheat and current faults are effectively avoided, and the safety and stability of the system are improved.

[0156] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0157] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine intake air preheating control method characterized by, 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 the correction coefficient according to the oil temperature and the ambient pressure, and corrects the target intake temperature using the correction coefficient; the specific steps of step S2 are as follows: S21. A correction coefficient-ambient pressure-oil temperature mapping table that changes with the ambient pressure and the oil temperature is pre-stored in the engine controller; S22. The engine controller acquires the oil temperature through the oil temperature sensor and acquires the ambient pressure through the ambient pressure sensor; S23. The engine controller determines the correction coefficient by searching the correction coefficient-ambient pressure-oil temperature mapping table according to the oil temperature and the ambient pressure; S24. The engine controller corrects the determined target intake temperature of the engine using the determined correction coefficient to obtain the corrected target intake temperature; S3. The engine controller controls the intake preheater to preheat the engine intake until the corrected target intake temperature is met; S4. The engine controller informs the driver to start the engine through the instrument panel.

2. The engine intake air preheating control method according to claim 1, characterized by, The specific steps of step S1 are as follows: S11. The engine controller acquires the ambient temperature through the ambient temperature sensor; S12. The engine controller determines whether the ambient temperature is lower than the ambient temperature threshold value; If yes, step S13 is entered; If no, step S4 is entered; S13. The engine controller determines the target intake temperature of the engine according to the ambient temperature.

3. The engine intake air preheating control method according to claim 2, characterized by, Before step S11, the following steps are further included: SS1. An ambient temperature threshold value is pre-stored in the engine controller; SS2. An ambient temperature-target intake temperature mapping table that changes with the ambient temperature is pre-stored in the engine controller; In step S13, the engine controller searches the ambient temperature-target intake temperature mapping table according to the ambient temperature to determine the required target intake temperature.

4. The engine intake air preheating control method according to claim 3, characterized by, The specific steps of step S3 are as follows: S31. The engine controller controls the intake preheater to start; S32. The engine controller acquires the intake temperature through the intake temperature sensor; S33. The engine controller determines whether the intake temperature is less than the corrected target intake temperature; If yes, step S34 is entered; If no, step S35 is entered; S34. The engine controller controls the intake preheater to maintain the heating state, and returns to step S32; S35. The engine controller controls the intake preheater to stop working, and enters step S4.

5. The engine intake air preheating control method according to claim 4, characterized by, In step S34, the following steps are further included: SA1. A timing unit of the intake preheater times the working time length of the heating resistance wire and provides the working time length to the heating controller; SA2. The heating controller determines whether the working time length exceeds the heating upper limit time; If yes, step SA3 is entered; If no, step SA4 is entered; SA3. The heating controller determines that the engine controller is faulty, cuts off the circuit of the heating resistance wire, and stops heating; SA4. A current detection unit of the intake heater acquires the working current of the heating resistance wire and provides the working current to the heating controller; SA5. The heating controller identifies the working current; When the working current exceeds the current upper limit value, step SA6 is entered; When the working current is lower than the lower limit of the current and is not 0, step SA7 is entered; When the working current is 0, step SA8 is entered; SA6. The heating controller cuts off the working of the heating resistance wire, reports a too large current fault to the engine controller, and ends; SA7. The heating controller cuts off the working of the heating resistance wire, reports a too small current fault to the engine controller, and ends; SA8. The heating controller reports a non-heating fault to the engine controller.

6. An engine intake air preheating control system applying the engine intake air preheating control method according to any one of claims 1 to 5, characterized by The engine controller is connected with an ambient temperature sensor, an ambient pressure sensor, an oil temperature sensor, an intake temperature sensor, an intake preheater, and an instrument panel; The engine controller determines whether to preheat the engine intake according to the data collected by the ambient temperature sensor, the ambient pressure sensor, the oil temperature sensor, and the intake temperature sensor, determines the target intake temperature for preheating the engine intake, and controls the intake preheater to preheat the engine intake according to the target intake temperature, and notifies the driver to start the engine through the instrument panel after the preheating is completed. The battery is further included; 7. The engine intake air pre-heat control system of claim 6, wherein, The battery supplies power for the engine controller and the intake preheater. The ambient temperature sensor and the ambient pressure sensor are arranged outside the engine; 8. The engine intake air pre-heat control system of claim 6, wherein, The oil temperature sensor is arranged in an oil pipeline connected with the engine; The intake temperature sensor is arranged at the inlet of an engine intake pipe; The intake preheater is arranged in the engine intake pipe and close to the inlet of the engine intake pipe. The intake preheater includes a heating controller, a heating resistance wire, a timing unit, and a current detection unit; 9. The engine intake air pre-heat control system of claim 6, wherein, The heating controller is connected with the heating resistance wire, the timing unit, and the current detection unit; The heating controller receives the instruction of the engine controller and controls the opening and closing of the heating function of the heating resistance wire; The timing unit is used for timing the working time length of the heating resistance wire; The current detection unit is used for detecting the current in the heating resistance wire; The heating controller is used for notifying to close the heating resistance wire when the working time length exceeds the upper limit of heating time, identifying the current fault of the heating resistance wire, and notifying the engine controller. ​

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