Air inlet heater device and control method and system of air inlet heater

Abstract

The invention provides an air inlet heater device and an air inlet heater control method and system, which are applied to the electromechanical technical field, a first air inlet temperature and pressure sensor in the air inlet heater device is arranged at an inlet of an air inlet pipeline, one end of the first air inlet temperature and pressure sensor is connected with a radiator, and the other end of the first air inlet temperature and pressure sensor is connected with a first end of a bypass valve; the second end of the bypass valve is connected with the first end of the second air inlet temperature and pressure sensor, and the second end of the second air inlet temperature and pressure sensor is connected with the cylinder cover air inlet channel. The third end of the bypass valve is connected with one end of the air inlet heater, and the other end of the air inlet heater is connected with the third end of the second air inlet temperature and pressure sensor; when the temperature of the air flow is not lower than the second temperature threshold value or the first temperature threshold value, the air flow does not flow into the air inlet heater, repeated impact of the air flow on the air inlet heater in the operation process of the engine can be reduced, abrasion caused by friction between the heating grid and the ceramic block is avoided, and therefore the engine is prevented from breaking down; and the service lives of the intake heater and the engine are prolonged.

Description

Technical Field

[0001] The present invention relates to the field of electromechanical technology, and more specifically, to an air intake heater device, and a control method and system for the air intake heater. Background Art

[0002] An air intake heater is usually installed on the engine's intake pipe. When the vehicle is started, especially in cold weather conditions, the air intake heater controls the electric heating wire to heat the air, so that it is heated up, and then the heated air is introduced into the engine intake duct. In this way, the engine can quickly reach the operating temperature when starting, thereby achieving better low-temperature starting performance, reducing the wear of the cold air on the engine, and thus extending the engine life.

[0003] In the prior art, the air intake heater is mainly composed of three parts: the outer tube body, the heating grid, and the ceramic block. Since the engine needs to inhale a large amount of air during operation, it is easy to form a large airflow impact on the heating grid. Under the transient alternating changes of the airflow, the gas force acting on the heating grid will fluctuate, causing the heating grid and the ceramic block to repeatedly contact and rub under the impact of the airflow. Over time, the heating grid will break and enter the engine combustion chamber with the airflow, causing a series of damages to the engine such as cylinder pulling and piston collision, thus causing fatal engine failures.

[0004] Therefore, how to provide a control method for the air intake heater to reduce the repeated impact of airflow on the air intake heater during engine operation, which causes wear on the heating grid and ceramic block, thereby avoiding fatal engine failure and increasing the life of the air intake heater and the engine, is a problem that urgently needs to be solved in this application. Summary of the invention

[0005] In view of this, the present invention provides an air intake heater device, an air intake heater control method and a system, aiming to reduce the wear of the heating grid and the ceramic block caused by repeated impact of airflow on the air intake heater during engine operation, thereby avoiding fatal failure of the engine and prolonging the life of the air intake heater and the engine.

[0006] A first aspect of the present application provides an intake air heater device, the intake air heater device comprising a first intake air pressure sensor, a bypass valve, a second intake air pressure sensor and an intake air heater;

[0007] The first intake air pressure sensor is arranged at the inlet of the intake pipe of the engine;

[0008] One end of the first intake air and pressure sensor is connected to the radiator, and the other end of the first intake air and pressure sensor is connected to the first end of the bypass valve;

[0009] The second end of the bypass valve is connected to the first end of the second intake air and pressure sensor, and the second end of the second intake air and pressure sensor is connected to the cylinder head intake passage;

[0010] The third end of the bypass valve is connected to one end of the intake air heater, and the other end of the intake air heater is connected to the third end of the second intake air temperature and pressure sensor.

[0011] Optionally, the air intake heater device further includes a main flow channel and a bypass flow channel;

[0012] The second end of the bypass valve is connected to the first end of the second intake air and pressure sensor through the main flow channel, and the second end of the second intake air and pressure sensor is connected to the cylinder head intake channel;

[0013] The third end of the bypass valve is connected to one end of the intake air heater through a bypass flow channel, and the other end of the intake air heater is connected to the third end of the second intake air temperature and pressure sensor.

[0014] A second aspect of the present application provides a control method for an air intake heater, which is applied to the air intake heater device provided in the first aspect of the present application, and the method comprises:

[0015] When it is detected that the engine is started, a first temperature of the airflow in the intake pipe is detected by a first intake air pressure sensor, and it is determined whether the first temperature is less than a preset first temperature threshold;

[0016] If the first temperature is not less than the first temperature threshold, the airflow is controlled to directly enter the cylinder head intake passage through a bypass valve, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage;

[0017] If the first temperature is less than the first temperature threshold, the airflow is controlled to enter the intake heater through the bypass valve, and the second temperature of the airflow is detected by the second intake air and pressure sensor to determine whether the second temperature is less than a second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold;

[0018] If the second temperature is lower than the second temperature threshold, the air intake heater is controlled to heat the airflow, and the heated airflow is controlled to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and combusted in the engine combustion chamber in the cylinder head intake duct.

[0019] Optionally, the method further includes:

[0020] If the second temperature is not less than the second temperature threshold, the airflow is controlled to enter the cylinder head intake passage through the second intake air and pressure sensor, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

[0021] Optionally, if the first temperature is not less than the first temperature threshold, controlling the airflow to directly enter the cylinder head intake passage through a bypass valve so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage includes:

[0022] If the first temperature is not less than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is opened and the bypass flow channel is closed through the bypass valve to control the airflow to directly enter the cylinder head intake channel, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel.

[0023] Optionally, if the first temperature is less than the first temperature threshold, controlling the airflow to enter the intake heater through the bypass valve, and detecting the second temperature of the airflow through a second intake air and pressure sensor, and determining whether the second temperature is less than a second temperature threshold, includes:

[0024] If the first temperature is less than the first temperature threshold, controlling the bypass valve to open, and closing the main flow channel and opening the bypass flow channel through the bypass valve to control the airflow to enter the intake heater;

[0025] After the airflow enters the intake heater, the second temperature of the airflow is re-detected by the second intake air and pressure sensor, and it is determined whether the second temperature of the airflow is less than a second temperature threshold.

[0026] Optionally, if the second temperature is less than the second temperature threshold, controlling the air intake heater to heat the airflow, and controlling the heated airflow to enter the cylinder head intake passage, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage, including:

[0027] If the second temperature is less than the second temperature threshold, determining a target heating time that matches the second temperature of the airflow from various pre-set heating times;

[0028] controlling the air intake heater to heat the airflow according to the target heating time;

[0029] When it is detected that the time for the air intake heater to heat the airflow reaches the target heating time, the heated airflow is controlled to enter the cylinder head intake passage, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

[0030] A third aspect of the present application provides a control system for an air intake heater, which is applied to the air intake heater device provided in the first aspect of the present application, and the system includes:

[0031] a first judgment unit, configured to detect a first temperature of the airflow in the intake pipe through a first intake air pressure sensor when the engine is detected to be started, and to judge whether the first temperature is less than a preset first temperature threshold;

[0032] a first control unit, configured to control the airflow to directly enter the cylinder head intake passage through a bypass valve if the first temperature is not less than the first temperature threshold, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage;

[0033] a second judgment unit, configured to control the airflow to enter the air intake heater through the bypass valve if the first temperature is less than the first temperature threshold, and detect a second temperature of the airflow through a second air intake air pressure sensor to judge whether the second temperature is less than a second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold;

[0034] The second control unit is used to control the air intake heater to heat the airflow if the second temperature is less than the second temperature threshold, and control the heated airflow to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct.

[0035] Optionally, the system comprises:

[0036] The third control unit is used to control the airflow to enter the cylinder head intake passage through the second intake air and pressure sensor if the second temperature is not less than the second temperature threshold, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

[0037] Optionally, the first control unit is specifically configured to:

[0038] If the first temperature is not less than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is opened and the bypass flow channel is closed through the bypass valve to control the airflow to directly enter the cylinder head intake channel, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel.

[0039] The present application provides an intake heater device, an intake heater control method and a system. When it is detected that the engine is started, if the first temperature of the airflow is not lower than the first temperature threshold value determined by the first intake air pressure sensor, the airflow is controlled to directly enter the cylinder head intake passage through the bypass valve, that is, the airflow is controlled to no longer flow into the intake heater; if the singular temperature of the airflow is not lower than the first temperature threshold value determined by the first intake air pressure sensor, the airflow is controlled to flow into the intake heater through the bypass valve, which can reduce the repeated impact of the airflow on the intake heater, avoid the friction and wear of the heating grid and the ceramic block in the intake heater, thereby improving the life of the intake heater, and indirectly avoid a series of engine failures such as cylinder pulling and piston collision in the engine cylinder due to damage to the heating grid of the intake heater, thereby improving the life of the engine; and after the airflow enters the intake heater, it is determined by the second intake air pressure sensor whether the airflow in the intake heater needs to be heated. When it is determined that heating is required, the intake heater is controlled to heat the airflow, which can effectively save the resources of the intake heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of an air intake heater device provided in an embodiment of the present application;

[0042] Figure 2 A schematic structural diagram of another air intake heater device provided in an embodiment of the present application;

[0043] Figure 3 A schematic flow chart of a control method for an air intake heater provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the structure of a control system of an air intake heater provided in an embodiment of the present application;

[0045] in, Figure 1 and Figure 2 "1" indicates the radiator, "2" indicates the first intake air pressure sensor, "3" indicates the bypass valve, "4" indicates the second intake air pressure sensor, "5" indicates the intake heater, and "6" indicates the cylinder head intake passage. Figure 2 The "7" in the figure represents the main flow channel, the "8" represents the bypass flow channel, the "9" represents the supercharger compressor, and the "10" represents the air filter. DETAILED DESCRIPTION

[0046] 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.

[0047] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0048] In order to better understand this application, the technical names involved in this application are explained below:

[0049] Intake air heater: A device that quickly increases the intake air temperature through resistance heating, consisting of three parts: an outer tube body, a heating grid, and a ceramic block.

[0050] Ceramic block: The material used to fix the heating grille in the air intake heater. It has great hardness, far exceeding the performance of steel and stainless steel, and has good heat resistance.

[0051] Intake air pressure sensor: An electrical component used to sense the temperature and pressure of the airflow and convert it into an electrical signal to be transmitted to the electronic control unit (ECU).

[0052] Electronic Control Unit: It is an integrated control device of the engine. Its function is to calculate, process and judge various information input by the sensors on the engine according to its own stored programs, and then output instructions to the relevant actuators to achieve the purpose of fast, accurate and automatic control of the engine operation.

[0053] Bypass valve: A three-way valve structure installed on the intake pipe to control the direction of air flow.

[0054] See also Figure 1, shows a schematic structural diagram of an intake air heater device provided in an embodiment of the present application, the intake air heater device includes a first intake air and pressure sensor 2, a bypass valve 3, a second intake air and pressure sensor 4 and an intake air heater 5;

[0055] The first intake air pressure sensor 2 is arranged at the inlet of the engine intake pipe;

[0056] One end of the first intake air and pressure sensor 2 is connected to the radiator 1, and the other end of the first intake air and pressure sensor 2 is connected to the first end of the bypass valve 3;

[0057] The second end of the bypass valve 3 is connected to the first end of the second intake air and pressure sensor 4, and the second end of the second intake air and pressure sensor 4 is connected to the cylinder head intake passage 6;

[0058] The third end of the bypass valve 3 is connected to one end of the intake air heater 5 , and the other end of the intake air heater 5 is connected to the third end of the second intake air temperature and pressure sensor 4 .

[0059] Optional, see Figure 2 The air intake heater device further includes a main flow channel 7 and a bypass flow channel 8. Accordingly, the second end of the bypass valve 3 is connected to the first end of the second intake air and pressure sensor 4 through the main flow channel 7, and the second end of the second intake air and pressure sensor 4 is connected to the cylinder head intake channel 6;

[0060] The third end of the bypass valve 3 is connected to one end of the intake air heater 5 through the bypass flow channel 8 , and the other end of the intake air heater 5 is connected to the third end of the second intake air temperature and pressure sensor 4 .

[0061] In actual application, Figure 2 It can be seen that a first intake air and pressure sensor 2 is added to the original intake pipe of the engine. Specifically, a first intake air and pressure sensor 2 is arranged after the radiator 1 and at the inlet of the intake pipe; a bypass valve 3 is arranged after the first intake air and pressure sensor 2 and before the intake heater 5, that is, a bypass valve 3 is arranged between the first intake air and pressure sensor 2 and the intake heater 5 to control the direction of the intake air; the bypass valve 3 is connected to the intake heater 5 and the second intake air and pressure sensor 4 through branch channels, specifically, the bypass valve 3 is connected to the intake heater 5 through the bypass channel 8, and the bypass valve 3 is connected to the second intake air and pressure sensor 4 through the main channel 7, so as to control the opening and closing of the main channel 7 and the bypass channel 8 by the bypass valve 3 to control the direction of the intake air.

[0062] It should be noted that the main flow channel 7 is also called a main flow channel with an intake air heater, and the bypass flow channel 8 is also called a bypass flow channel without an intake air heater.

[0063] based on Figure 1 and Figure 2The air intake heater device is shown. Accordingly, the present application embodiment provides a control method for the air intake heater, such as Figure 3 As shown, the method is applied to an air intake heater device, and the method specifically comprises the following steps:

[0064] S301: When the engine is detected to be started, the first temperature of the airflow in the intake pipe is detected by the first intake air pressure sensor, and it is determined whether the first temperature is less than a preset first temperature threshold. If the first temperature is not less than the first temperature threshold, step S302 is executed; if the first temperature is less than the first temperature threshold, step S303 is executed.

[0065] In the specific process of executing step S301, after the engine is started, the airflow will flow through the controller filter, supercharger and radiator 1 and reach the first intake air pressure sensor 2 on the intake pipe. Therefore, within a certain period of time after the engine is detected to be started, the temperature of the airflow in the intake pipe can be detected in real time by the first intake air pressure sensor 2 (for the convenience of distinction, the temperature of the airflow in the intake pipe is called the first temperature), and the first temperature of the airflow is converted into an electrical signal recognizable by the electronic control unit, so as to forward the obtained electrical signal to the electronic control unit, so that the electronic control unit determines the first temperature of the airflow according to the received electrical signal, and determines whether the first temperature of the airflow is less than the preset first temperature threshold. If the first temperature is not less than the first temperature threshold, step S302 is executed; if the first temperature is less than the first temperature threshold, step S303 is executed.

[0066] It should be noted that, if it is determined that the first temperature of the airflow is not less than the first temperature threshold, it means that the current temperature of the airflow is suitable and will not affect the start of the engine, and no heating is required. At this time, step S302 can be executed to allow the airflow to flow directly into the cylinder head intake duct 6; if it is determined that the first temperature of the airflow is less than the first temperature threshold, it means that the current temperature of the airflow may be relatively low and may need to be heated. In order to avoid cold air from directly entering the engine, the airflow can first flow into the intake heater 5. At the same time, in order to avoid wasting resources of the intake heater 5 and affecting the detection accuracy of the first intake air and pressure sensor 2, step S303 can be executed to use the second intake air and pressure sensor 4 to re-determine whether the airflow in the intake heater 5 needs to be heated.

[0067] It should be noted that the certain time period can be 10 minutes, 20 minutes, half an hour, etc., and can be set according to actual applications, and is not limited in this embodiment of the present application.

[0068] It should also be noted that the pre-set first temperature threshold may be 9° C., 10° C., etc., and may be set according to actual applications, and is not limited in this embodiment of the present application.

[0069] S302: The bypass valve is used to control the airflow to directly enter the cylinder head intake passage, so that the airflow is mixed with the diesel in the engine combustion chamber in the cylinder head intake passage and burns.

[0070] During the specific execution of step S302, when it is determined that the first temperature of the airflow is not less than the first temperature threshold, in order to prevent the hot airflow from entering the intake heater 5, the airflow can be directly delivered into the cylinder head intake duct 6 through the bypass valve 3 and the main channel 7, so that the airflow is mixed with diesel in the engine combustion chamber in the cylinder head intake duct 6 and burns.

[0071] Optionally, when it is determined that the first temperature of the air flow is not less than the first temperature threshold, the bypass valve 3 can be controlled to open, and the main channel 7 can be opened and the bypass channel 8 can be closed through the bypass valve 3 to control the air flow to enter the cylinder head intake channel 6 through the bypass valve 3, the main channel 7 and the second intake air and pressure sensor 4, so that the air flow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel 6.

[0072] In actual application, when it is determined that the first temperature of the airflow is not less than the first temperature threshold, an electrical signal can be transmitted to the bypass valve 3 through the electronic control unit, wherein the electrical signal indicates that the bypass valve 3 and the main flow channel 7 are open but the bypass flow channel 8 is closed; after receiving the electrical signal, the bypass valve 3 controls itself to open through its own actuator, and simultaneously opens the main flow channel 7 and closes the bypass flow channel 8, so that the airflow passes through the bypass valve 3, the main flow channel 7 and the second intake air and pressure sensor 4 into the cylinder head intake channel 6, and is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel 6.

[0073] S303: Control the airflow to enter the intake heater through the bypass valve, and detect the second temperature of the airflow through the second intake air and pressure sensor to determine whether the second temperature is less than the second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold. If the second temperature of the airflow is less than the second temperature threshold, execute step S304; if the second temperature of the airflow is not less than the second temperature threshold, execute step S305.

[0074] In the specific execution of step S303, when it is determined that the first temperature of the airflow is less than the first temperature threshold, in order to prevent cool air from directly entering the engine, the airflow can be transmitted to the intake heater 5 through the bypass valve 3 and the bypass flow channel 8; at the same time, in order to avoid wasting resources of the intake heater 5 and affecting the detection accuracy of the first intake air and pressure sensor 2, the temperature of the airflow in the intake heater 5 can be re-detected by the second intake air and pressure sensor 4 (for the sake of distinction, the detected temperature of the airflow of the intake heater 5 is referred to as the second temperature), and according to the detected second temperature, it is determined whether it is necessary to control the intake heater 5 to heat the airflow, that is, to determine whether the second temperature is less than the second temperature threshold; when it is determined that the second temperature of the airflow is less than the second temperature threshold, the intake heater 5 is controlled to heat the airflow, that is, step S304 is executed to prevent cool air from directly entering the engine; when it is determined that the second temperature of the airflow is not less than the second temperature threshold, step S305 is executed.

[0075] Optionally, if the first temperature is lower than the first temperature threshold, the bypass valve 3 is used to control the airflow to enter the air intake heater 5, and the second temperature of the airflow is detected by the second intake air and pressure sensor 4. The process of judging whether the second temperature is lower than the second temperature threshold may be specifically as follows: if the first temperature is lower than the first temperature threshold, the bypass valve 3 is controlled to open, and the main flow channel 7 is closed and the bypass flow channel 8 is opened by the bypass valve 3 to control the airflow to enter the air intake heater 5; after the airflow enters the air intake heater 5, the second temperature of the airflow is re-detected by the second intake air and pressure sensor 4, and it is judged whether the second temperature of the airflow is lower than the second temperature threshold.

[0076] In actual application, when it is determined that the first temperature of the airflow is less than the first temperature threshold, an electrical signal can be transmitted to the bypass valve 3 through the electronic control unit, wherein the electrical signal indicates that the bypass valve 3 and the bypass flow channel 8 are open but the main flow channel 7 is closed; after receiving the electrical signal, the bypass valve 3 controls itself to open through its own actuator, while closing the main flow channel 7 and opening the bypass flow channel 8, so that the airflow passes through the bypass valve 3 and the bypass flow channel 8 and enters the intake heater 5.

[0077] It should be noted that the corresponding second temperature threshold can be pre-set according to the heating requirement of the intake heater 5, and the second temperature threshold is less than the first temperature threshold. For example, when the first temperature threshold is set to 10°C, the second temperature threshold can be set to 5°C according to the heating requirement of the intake heater 5. The specific value of the second temperature threshold can be set according to actual application, which is not limited in this embodiment of the present application.

[0078] S304: Control the air intake heater to heat the airflow, and control the heated airflow to enter the cylinder head intake passage, so that the heated airflow is mixed with diesel in the engine combustion chamber in the cylinder head intake passage and burns.

[0079] In an embodiment of the present application, historical heating information of the air intake heater 5 is obtained, wherein the historical heating information includes the historical temperature of the airflow and its historical heating time; based on the historical temperature of the airflow and its historical heating time in the historical heating information, multiple heating times and a temperature range corresponding to each heating time are set.

[0080] It should be noted that, from the historical heating information of the air intake heater 5, it can be analyzed that the lower the temperature of the air flow, the longer the heating time required; for example, three heating times are pre-set, namely heating time 1, heating time 2 and heating time 3, heating time 1 is less than heating time 2, and heating time 2 is less than heating time 3; then the temperature range corresponding to heating time 1 can be set to [0℃, 5℃], the temperature range corresponding to heating time 2 can be set to [-5℃, 0℃], and the temperature range corresponding to heating time 3 can be set to [-10℃, -5℃].

[0081] The above is merely a preferred method for setting multiple heating times and their corresponding temperature ranges provided in an embodiment of the present application. The specific setting method of the heating time and its corresponding temperature range can be set according to actual applications and is not limited in this embodiment of the present application.

[0082] In an embodiment of the present application, if the second temperature is less than the second temperature threshold, a target heating time matching the second temperature of the airflow is determined from various pre-set heating times; the air intake heater 5 is controlled to heat the airflow according to the target heating time; when it is detected that the time for the air intake heater 5 to heat the airflow reaches the target heating time, the heated airflow is controlled to enter the cylinder head intake duct 6, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct 6.

[0083] In actual application, when it is determined that the second temperature of the airflow in the intake heater 5 is less than the second temperature threshold, it means that the temperature of the airflow in the intake heater 5 is low. In order to solve the problem that the engine is difficult to start in a low temperature environment, the target temperature range to which the second temperature of the airflow belongs can be determined from various pre-set temperature ranges by the electronic control unit, and the heating time corresponding to the target temperature range is determined as the target heating time matching the second temperature; after determining the target heating time, the electronic control unit can transmit an electric signal to the bypass valve 3, wherein the electric signal transmitted at this time carries a heating instruction and a target heating time; after receiving the electric signal, the bypass valve 3 transmits the electric signal to the intake heater 5 through its own actuator, so that when the intake heater 5 receives the electric signal, the heating function is turned on according to the heating instruction, and the airflow in the intake heater 5 is heated according to the target heating time. When it is detected that the heating time reaches the target heating time, the heated airflow is controlled to enter the cylinder head intake passage 6 through the second intake air and pressure sensor 4, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage 6.

[0084] S305: Control the airflow to enter the cylinder head intake passage through the second intake air pressure sensor, so that the airflow is mixed with the diesel in the engine combustion chamber in the cylinder head intake passage and burns.

[0085] During the specific execution of step S305, when it is determined that the second temperature of the air flow in the air intake heater 5 is not less than the second temperature threshold, it can be considered that the air flow at this temperature will not affect the start of the engine. In order to further save the resources of the air intake heater 5, the air flow in the air intake heater 5 can be controlled to enter the cylinder head intake duct 6 through the second intake air pressure sensor 4, so that the heated air flow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct 6.

[0086] The present application provides a control method for an intake heater. When it is detected that the engine is started, a first intake air pressure sensor 2 is used to detect a first temperature of an air flow in an intake pipe, and it is determined whether the first temperature is less than a preset first temperature threshold value; if the first temperature is not less than the first temperature threshold value, the bypass valve 3 is used to control the air flow to directly enter the cylinder head intake passage, so that the air flow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage 6; if the first temperature is less than the first temperature threshold value, the bypass valve 3 is used to control the air flow to enter the intake heater, and a second intake air pressure sensor is used to detect a second temperature of the air flow, and it is determined whether the second temperature is less than the second temperature threshold value; wherein the first temperature threshold value is greater than the second temperature threshold value; if the second temperature is less than the second temperature threshold value, the intake heater is controlled to heat the air flow, and the heated air flow is controlled to enter the cylinder head intake passage, so that the heated air flow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage. It can be seen that the technical solution provided by the present application controls the airflow to enter the air intake heater 5 when the temperature of the airflow is lower than the second temperature threshold value. If the temperature of the airflow is not lower than the second temperature threshold value or not lower than the first temperature threshold value, the airflow is controlled to directly enter the cylinder head intake duct 6, that is, the airflow no longer flows into the air intake heater 5, which can reduce the repeated impact of the airflow on the air intake heater 5 and avoid the problem of wear caused by friction between the heating grid and the ceramic block in the air intake heater 5, thereby improving the life of the air intake heater 5. At the same time, it can also indirectly avoid a series of engine failures such as cylinder pulling and piston collision in the engine cylinder due to damage to the heating grid of the air intake heater 5, thereby improving the life of the engine.

[0087] Based on the control method of the air intake heater provided in the above embodiment of the present application, the embodiment of the present application also provides a control system of the air intake heater, such as Figure 4 As shown, the control system of the air intake heater is applied to the air intake heater device shown in the above embodiment of the present application, and the system includes:

[0088] The first judgment unit 41 is used to detect a first temperature of the airflow in the intake pipe through a first intake air pressure sensor when the engine is detected to be started, and to judge whether the first temperature is less than a preset first temperature threshold;

[0089] A first control unit 42 is used to control the airflow to directly enter the cylinder head intake passage through the bypass valve if the first temperature is not less than the first temperature threshold, so that the airflow is mixed with the diesel in the engine combustion chamber in the cylinder head intake passage and burns;

[0090] The second judgment unit 43 is used to control the airflow to enter the intake heater through the bypass valve if the first temperature is less than the first temperature threshold, and detect the second temperature of the airflow through the second intake air and pressure sensor to determine whether the second temperature is less than the second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold;

[0091] The second control unit 44 is used to control the intake heater to heat the airflow if the second temperature is less than the second temperature threshold, and control the heated airflow to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct.

[0092] The specific principles and execution processes of each unit in the control system of the air intake heater disclosed in the above-mentioned embodiment of the present application are the same as the control method of the air intake heater disclosed in the above-mentioned embodiment of the present application. Please refer to the corresponding parts of the control method of the air intake heater disclosed in the above-mentioned embodiment of the present application, and will not be repeated here.

[0093] The present application provides a control method for an intake heater. When it is detected that the engine is started, a first intake air pressure sensor is used to detect a first temperature of an air flow in an intake pipe, and it is determined whether the first temperature is less than a preset first temperature threshold value; if the first temperature is not less than the first temperature threshold value, a bypass valve is used to control the air flow to directly enter a cylinder head intake passage, so that the air flow is mixed with diesel and burned in an engine combustion chamber in the cylinder head intake passage; if the first temperature is less than the first temperature threshold value, the bypass valve is used to control the air flow to enter the intake heater, and a second intake air pressure sensor is used to detect a second temperature of the air flow, and it is determined whether the second temperature is less than a second temperature threshold value; wherein the first temperature threshold value is greater than the second temperature threshold value; if the second temperature is less than the second temperature threshold value, the intake heater is controlled to heat the air flow, and the heated air flow is controlled to enter the cylinder head intake passage, so that the heated air flow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage. It can be seen that the technical solution provided by the present application controls the airflow to enter the air intake heater when the temperature of the airflow is lower than the second temperature threshold value. If the temperature of the airflow is not lower than the second temperature threshold value or not lower than the first temperature threshold value, the airflow is controlled to directly enter the cylinder head intake duct, that is, the airflow no longer flows into the air intake heater, which can reduce the repeated impact of the airflow on the air intake heater and avoid the problem of wear caused by friction between the heating grid and the ceramic block in the air intake heater, thereby improving the life of the air intake heater. At the same time, it can also indirectly avoid a series of engine failures such as cylinder pulling and piston collision in the engine cylinder due to damage to the heating grid of the air intake heater, thereby improving the life of the engine.

[0094] Optionally, the control system of the air intake heater provided in the embodiment of the present application further includes:

[0095] The third control unit is used to control the airflow to enter the cylinder head intake passage through the second intake air and pressure sensor if the second temperature is not less than the second temperature threshold, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

[0096] Optionally, the first control unit is specifically configured to:

[0097] If the first temperature is not less than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is opened and the bypass flow channel is closed through the bypass valve to control the airflow to directly enter the cylinder head intake channel, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel.

[0098] Optionally, the second judgment unit is specifically configured to:

[0099] If the first temperature is lower than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is closed and the bypass flow channel is opened through the bypass valve to control the airflow entering the intake heater; after the airflow enters the intake heater, the second temperature of the airflow is re-detected through the second temperature-pressure intake sensor, and it is determined whether the second temperature of the airflow is lower than the second temperature threshold.

[0100] Optionally, the second control unit is specifically configured to:

[0101] If the second temperature is less than the second temperature threshold, a target heating time matching the second temperature of the airflow is determined from various pre-set heating times; the air intake heater is controlled to heat the airflow according to the target heating time; when it is detected that the time for the air intake heater to heat the airflow reaches the target heating time, the heated airflow is controlled to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct.

[0102] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, in which the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0103] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0104] 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.

[0105] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An air intake heater device, characterized in that: The intake air heater device includes a first intake air pressure sensor, a bypass valve, a second intake air pressure sensor and an intake air heater; The first intake air pressure sensor is arranged at the inlet of the intake pipe of the engine; One end of the first intake air and pressure sensor is connected to the radiator, and the other end of the first intake air and pressure sensor is connected to the first end of the bypass valve; The second end of the bypass valve is connected to the first end of the second intake air and pressure sensor, and the second end of the second intake air and pressure sensor is connected to the cylinder head intake passage; The third end of the bypass valve is connected to one end of the intake air heater, and the other end of the intake air heater is connected to the third end of the second intake air temperature and pressure sensor.

2. The device according to claim 1, characterized in that The air intake heater device further includes a main flow channel and a bypass flow channel; The second end of the bypass valve is connected to the first end of the second intake air and pressure sensor through the main flow channel, and the second end of the second intake air and pressure sensor is connected to the cylinder head intake channel; The third end of the bypass valve is connected to one end of the intake air heater through a bypass flow channel, and the other end of the intake air heater is connected to the third end of the second intake air temperature and pressure sensor.

3. A control method for an air intake heater, characterized in that: Applied to the air intake heater device according to any one of claims 1 to 2, the method comprising: When it is detected that the engine is started, a first temperature of the airflow in the intake pipe is detected by a first intake air pressure sensor, and it is determined whether the first temperature is less than a preset first temperature threshold; If the first temperature is not less than the first temperature threshold, the airflow is controlled to directly enter the cylinder head intake passage through a bypass valve, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage; If the first temperature is less than the first temperature threshold, the airflow is controlled to enter the intake heater through the bypass valve, and the second temperature of the airflow is detected by the second intake air and pressure sensor to determine whether the second temperature is less than a second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold; If the second temperature is lower than the second temperature threshold, the air intake heater is controlled to heat the airflow, and the heated airflow is controlled to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and combusted in the engine combustion chamber in the cylinder head intake duct.

4. The method according to claim 3, characterized in that The method further comprises: If the second temperature is not less than the second temperature threshold, the airflow is controlled to enter the cylinder head intake passage through the second intake air and pressure sensor, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

5. The method according to claim 3, characterized in that: If the first temperature is not less than the first temperature threshold, the airflow is controlled to directly enter the cylinder head intake passage through a bypass valve so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage, including: If the first temperature is not less than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is opened and the bypass flow channel is closed through the bypass valve to control the airflow to directly enter the cylinder head intake channel, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel.

6. The method according to claim 5, characterized in that If the first temperature is less than the first temperature threshold, controlling the airflow to enter the intake heater through the bypass valve, detecting the second temperature of the airflow through the second intake air and pressure sensor, and determining whether the second temperature is less than the second temperature threshold, includes: If the first temperature is less than the first temperature threshold, controlling the bypass valve to open, and closing the main flow channel and opening the bypass flow channel through the bypass valve to control the airflow to enter the intake heater; After the airflow enters the intake heater, the second temperature of the airflow is re-detected by the second intake air and pressure sensor, and it is determined whether the second temperature of the airflow is less than a second temperature threshold.

7. The method according to claim 3, characterized in that If the second temperature is less than the second temperature threshold, controlling the air intake heater to heat the airflow, and controlling the heated airflow to enter the cylinder head intake passage, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage, including: If the second temperature is less than the second temperature threshold, determining a target heating time that matches the second temperature of the airflow from various pre-set heating times; controlling the air intake heater to heat the airflow according to the target heating time; When it is detected that the time for the air intake heater to heat the airflow reaches the target heating time, the heated airflow is controlled to enter the cylinder head intake passage, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

8. A control system for an air intake heater, characterized in that: Applicable to the air intake heater device according to any one of claims 1 to 2, the system comprising: a first judgment unit, configured to detect a first temperature of the airflow in the intake pipe through a first intake air pressure sensor when the engine is detected to be started, and to judge whether the first temperature is less than a preset first temperature threshold; a first control unit, configured to control the airflow to directly enter the cylinder head intake passage through a bypass valve if the first temperature is not less than the first temperature threshold, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage; a second judgment unit, configured to control the airflow to enter the air intake heater through the bypass valve if the first temperature is less than the first temperature threshold, and detect a second temperature of the airflow through a second air intake air pressure sensor to judge whether the second temperature is less than a second temperature threshold; wherein the first temperature threshold is greater than the second temperature threshold; The second control unit is used to control the air intake heater to heat the airflow if the second temperature is less than the second temperature threshold, and control the heated airflow to enter the cylinder head intake duct, so that the heated airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake duct.

9. The system according to claim 8, characterized in that The system comprises: The third control unit is used to control the airflow to enter the cylinder head intake passage through the second intake air and pressure sensor if the second temperature is not less than the second temperature threshold, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake passage.

10. The system according to claim 8, characterized in that The first control unit is specifically used for: If the first temperature is not less than the first temperature threshold, the bypass valve is controlled to open, and the main flow channel is opened and the bypass flow channel is closed through the bypass valve to control the airflow to directly enter the cylinder head intake channel, so that the airflow is mixed with diesel and burned in the engine combustion chamber in the cylinder head intake channel.

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