A method and system for controlling intercooler temperature of a methanol-diesel dual-fuel engine

Abstract

The present invention discloses a method and system for controlling the intercooler temperature of a methanol-diesel dual-fuel engine, wherein the system comprises an electronic control unit, an intercooler, a first cooling water inlet pipe, a cooling water outlet pipe, a thermal management valve device, a second cooling water pipe and a return pipe, wherein the thermal management valve device is respectively connected to the first cooling water inlet pipe, the second cooling water inlet pipe and the return pipe, and the return pipe is connected to the cooling water outlet pipe; the thermal management valve device comprises a ball valve and a driving mechanism for driving the ball valve to rotate, and the driving mechanism is communicatively connected to the electronic control unit; wherein the method adjusts the required intake air temperature according to different fuels and working conditions, and can take into account the optimization of the intake air temperature conditions under different fuels of the dual-fuel system, so that the engine can achieve the best combustion state no matter which fuel or mixed fuel is burned; by controlling the temperature of the intercooler, the problem of low methanol substitution rate in methanol-diesel dual fuel is solved, and the methanol-diesel ratio is achieved to the most economical state.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-fuel engines, and in particular to an intercooler temperature control method and system for a methanol-diesel dual-fuel engine. Background Art

[0002] Methanol fuel is a liquid fuel, and its storage and transportation can adopt the storage and transportation system of petroleum fuel, so the infrastructure investment is relatively small.

[0003] Compared to diesel's propensity to spontaneously ignite, methanol has a higher auto-ignition temperature. When a diesel engine uses a methanol-diesel blend, the diesel may reach ignition conditions before the methanol does. This results in the diesel spontaneously igniting first, followed by the ignited diesel fuel igniting the methanol. Given methanol's favorable combustion characteristics and economic efficiency, it's desirable to increase the proportion of methanol in the blend while ensuring proper engine operation.

[0004] In diesel mode, to improve engine intake efficiency, vehicles require an intercooler to cool the air entering the intake manifold, increasing intake density and air volume. However, when using a methanol-diesel blend, due to the high latent heat of vaporization of methanol, the fuel injected into the intake manifold significantly lowers the intake air temperature. This excessively low intake air temperature affects the engine cylinder temperature, leading to incomplete combustion of the fuel mixture and even cylinder misfire. Unburned methanol will flow down the cylinder walls, disrupting the lubricating oil film on the cylinder wall surface, resulting in poor lubrication between the cylinder and the rings, reduced airtightness, and increased cylinder wear. This also negatively impacts engine emissions, increasing harmful emissions such as unburned alcohol and formaldehyde. For these reasons, with traditional intercooler structures and temperature control methods, the methanol substitution rate in methanol-diesel fuel cannot be very high. Tests have shown that single-cylinder misfires occur when the methanol content exceeds 50%. Summary of the Invention

[0005] In view of the above-mentioned shortcomings, the technical problem to be solved by the present invention is: to provide an intercooler temperature control method and system for a methanol-diesel dual-fuel engine, which can adjust the intake temperature to the required level according to different fuels and operating conditions, and can optimize the intake temperature conditions under different fuels in the dual-fuel system, so that the engine can achieve the best combustion state regardless of which fuel or mixed fuel is burning.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A method for controlling the intercooler temperature of a methanol-diesel dual-fuel engine is applied to an intercooler temperature control system of a methanol-diesel dual-fuel engine. The control system includes an intercooler, a thermal management valve device, a first cooling water inlet pipe, a second cooling water inlet pipe, a cooling water outlet pipe, and a return pipe. The first cooling water inlet pipe is connected to the intercooler water inlet and the thermal management valve device. The thermal management valve device is also connected to the second cooling water inlet pipe. The cooling water outlet pipe is connected to the intercooler water outlet. The return pipe is connected to the thermal management valve device and the cooling water outlet pipe.

[0008] The control method comprises the following steps:

[0009] S10, obtaining the fuel status of the engine;

[0010] S20, determining whether the fuel state is a pure diesel state or a dual fuel state;

[0011] S30: If the fuel is pure diesel, the thermal management valve device is controlled to be fully opened, so that all the cooling water enters the first cooling water inlet pipe;

[0012] S40: If it is a dual fuel state, obtain the intake air temperature and the target temperature;

[0013] S50, calculating a temperature difference based on the intake air temperature and the target temperature;

[0014] S60, generating a corresponding rotation angle signal according to the temperature difference;

[0015] S70 : Control the rotation of the ball valve of the thermal management valve device according to the rotation angle signal to adjust the opening of the thermal management valve device.

[0016] Preferably, the step S60 includes the following steps:

[0017] S61. Determine whether the temperature difference is not less than 3°C based on the temperature difference;

[0018] S62. If yes, use the PID formula based on the temperature difference:

[0019] Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number;

[0020] S63, according to the rotation angle U k , generating a corresponding rotation angle signal;

[0021] S64: If no, execute S61.

[0022] A preferred embodiment is that, before S10, the following steps are further included:

[0023] Determine whether the engine is in the starting state;

[0024] If yes, the water outlet of the ball valve of the thermal management valve device is controlled to contact with the water inlet of the first cooling water inlet pipe in a small area.

[0025] In a preferred embodiment, the driving mechanism includes a motor and a connecting rod connected to the motor output shaft, wherein the connecting rod is connected to the ball valve of the thermal management valve device; when the rotation angle U k When the angle U is greater than 0, the motor of the driving mechanism rotates forward. k When it is less than 0, the drive mechanism motor reverses.

[0026] The preferred method is, K p , K i and K d is the limit value calibrated according to the real-time intake air temperature; K p , K i and K d A coefficient calibrated according to the time it takes for the intake air real-time temperature to reach the target temperature; and / or; K p , K i and K d It is a coefficient calibrated according to the real-time intake air temperature.

[0027] A methanol-diesel dual-fuel engine intercooler temperature control system includes an electronic control unit (ECU), an intercooler, a first cooling water inlet pipe and a cooling water outlet pipe, respectively connected to the intercooler, the system also including a thermal management valve device, a second cooling water pipe, and a return pipe, the thermal management valve device being respectively connected to the first cooling water inlet pipe, the second cooling water inlet pipe, and the return pipe, and the return pipe being also connected to the cooling water outlet pipe; the thermal management valve device including a ball valve and a drive mechanism for driving the ball valve to rotate, the ball valve being respectively connected to the water inlet of the first cooling water inlet pipe, the water outlet of the second cooling water inlet pipe, and the water inlet of the return pipe, the drive mechanism being communicatively connected to the ECU; the control system also includes a temperature detection unit electrically connected to the ECU, the temperature detection unit collecting real-time intake air temperature and transmitting a corresponding temperature signal to the ECU. Based on the received temperature signal, the ECU controls the drive mechanism to drive the rotation of the ball valve, thereby adjusting the amount of cooling water entering the intercooler to regulate the intake air temperature.

[0028] Preferably, the electronic control unit calculates the temperature difference between the real-time intake air temperature and the target temperature after receiving the temperature signal;

[0029] The control system further includes a PID adjustment unit electrically connected to the electronic control unit, and the PID adjustment unit uses the formula:

[0030] Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number;

[0031] The PID adjustment unit transmits the rotation angle U k The corresponding adjustment signal is sent to the electronic control unit, and the electronic control unit controls the driving mechanism to drive the ball valve to rotate according to the received adjustment signal, thereby adjusting the amount of cooling water entering the intercooler to adjust the intake air temperature.

[0032] Preferably, the electronic control unit starts the PID adjustment unit to adjust the intake air temperature when the temperature difference is not less than 3°C.

[0033] Preferably, the control system further comprises a preset unit electrically connected to the electronic control unit, the preset unit being used to calibrate K according to the real-time temperature of the intake air. p , K i and K d It is the limit value; it is used to calibrate K according to the time when the real-time intake temperature reaches the target temperature. p , K i and K d ; and / or; used to calibrate K according to the real-time intake air temperature p , K i and K d .

[0034] After adopting the above technical solution, the beneficial effects of the present invention are:

[0035] The present invention provides an intercooler temperature control method and system for a methanol-diesel dual-fuel engine, wherein the system includes an electronic control unit, an intercooler, a first cooling water inlet pipe and a cooling water outlet pipe respectively connected to the intercooler, the system also includes a thermal management valve device, a second cooling water pipe and a return pipe, the thermal management valve device is respectively connected to the first cooling water inlet pipe, the second cooling water inlet pipe and the return pipe, and the return pipe is also connected to the cooling water outlet pipe; the thermal management valve device includes a ball valve and a driving mechanism for driving the ball valve to rotate, the ball valve is respectively connected to the water inlet of the first cooling water inlet pipe, the water outlet of the second cooling water inlet pipe and the water inlet of the return pipe, and the driving mechanism is communicatively connected to the electronic control unit; wherein the method adjusts to achieve the required intake temperature according to different fuels and working conditions, and can take into account the optimization of the intake temperature conditions under different fuels of the dual-fuel system, so that the engine can achieve the best combustion state regardless of which fuel or mixed fuel is burned; by controlling the intercooler temperature, the problem of low methanol substitution rate in methanol-diesel dual fuel is solved, and the methanol-diesel ratio is achieved to the most economical state. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic block diagram of the control system of the present invention;

[0037] Figure 2 It is a flow chart of the control method in the present invention;

[0038] In the figure: 1-intercooler, 2-first cooling water inlet pipe, 3-thermal management valve device, 4-second cooling water inlet pipe, 5-return pipe, 6-cooling water outlet pipe, 70-75-arrows, 8-temperature sensor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Figure 1 The middle arrow 70 is the air inlet direction, the arrow 71 is the air outlet direction, the arrow 72 is the cooling water inlet direction of the intercooler, the arrow 73 is the direction of external cooling water entering the second cooling water inlet pipe 4, the arrow 74 is the return water direction, and the arrow 75 is the cooling water outlet direction of the intercooler.

[0041] Example 1:

[0042] like Figure 1 and Figure 2As shown, a method for controlling the intercooler temperature of a methanol-diesel dual-fuel engine is applied to the intercooler temperature control system of the methanol-diesel dual-fuel engine. The control system includes an intercooler 1, a thermal management valve device 3, a first cooling water inlet pipe 2, a second cooling water inlet pipe 4, a cooling water outlet pipe 6 and a return pipe 5. The first cooling water inlet pipe 2 is connected to the intercooler water inlet and the thermal management valve device 3, the thermal management valve device 3 is also connected to the second cooling water inlet pipe 4, the cooling water outlet pipe 6 is connected to the intercooler water outlet, and the return pipe 5 connects the thermal management valve device 3 and the cooling water outlet pipe 6; wherein the thermal management valve device 3 includes a ball valve and a driving mechanism for driving the ball valve to rotate, the driving mechanism includes a motor and a connecting rod connected to the motor output shaft, and the connecting rod is connected to the ball valve of the thermal management valve device 3.

[0043] The control method of the present invention comprises the following steps:

[0044] Step S10: obtaining the fuel status of the engine;

[0045] Step S20: determining whether the fuel state is pure diesel state or dual fuel state;

[0046] Step S30: If the fuel is pure diesel, the thermal management valve device 3 is controlled to be fully opened, so that all the cooling water enters the first cooling water inlet pipe 2 and all the cold water enters the intercooler 1;

[0047] Step S40: If it is a dual fuel state, obtain the intake air temperature and the target temperature;

[0048] Step S50: Calculate the temperature difference based on the intake air temperature and the target temperature;

[0049] Step S60: Generate a corresponding rotation angle signal according to the temperature difference. The specific steps are as follows:

[0050] Step S61: judging whether the temperature difference is not less than 3°C based on the temperature difference;

[0051] Step S62: If yes, that is, the temperature difference is ≥3°C, use the PID formula according to the temperature difference:

[0052] Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number;

[0053] When the rotation angle U k When the angle U is greater than 0, the motor of the driving mechanism rotates forward. k When it is less than 0, the driving mechanism motor reverses;

[0054] where K p, K i and K d is the limit value calibrated according to the real-time intake air temperature; K p , K i and K d A coefficient calibrated according to the time it takes for the intake air real-time temperature to reach the target temperature; and / or; K p , K i and K d It is a coefficient calibrated according to the real-time intake air temperature.

[0055] Step S63: According to the rotation angle U k , generating a corresponding rotation angle signal;

[0056] Step S64: If no, that is, the temperature difference is less than 3°C, execute S61; specifically, when the temperature difference is less than 3°C, the PID control unit is not started at this time, and the PID control unit is started again to adjust the intake air temperature after the temperature difference increases.

[0057] Step S70 : According to the rotation angle signal, the ball valve of the thermal management valve device 3 is controlled to rotate, and the opening of the thermal management valve device 3 is adjusted, thereby adjusting the temperature of the intercooler 1 .

[0058] In this embodiment, before S10, the following steps are also included:

[0059] Determine whether the engine is in the starting state;

[0060] If yes, that is, the engine is in the starting state, the ball valve outlet of the thermal management valve device 3 is controlled to contact the water inlet of the first cooling water inlet pipe 2 with a small area.

[0061] When the engine is started, the water temperature and the intake air temperature are relatively low. At this time, by controlling the ball valve outlet of the thermal management valve device 3 to overlap with a small area of the water inlet of the first cooling water inlet pipe 2, a small amount of cooling water enters the intercooler 1 through the first cooling water inlet pipe 2, and most of the cooling water enters the return pipe 5 and is directly discharged, thereby reducing the probability of engine start failure.

[0062] like Figure 1 and Figure 2As shown, the control method of the present invention is primarily based on the fuel used in the dual-fuel engine. Specifically, the following controls the intake air temperature: In the pure diesel fuel state, the temperature of the intercooler 1 should be as low as possible. At this time, the thermal management valve device 3 allows the cooling water to flow completely into the intercooler 1 to dissipate heat. Specifically, the drive mechanism of the thermal management valve device 3 rotates the ball valve, ensuring that the ball valve's outlet contacts the inlet of the first cooling water inlet pipe 2, allowing all cooling water to enter the intercooler 1. In the methanol-diesel mixed fuel state, the amount of cooling water entering the intercooler 1 is controlled based on the temperature difference between the real-time intake air temperature and the target temperature. When the temperature difference is less than 3°C, PID control is not performed. When the temperature is not less than 3°C, a rotation angle signal is derived using a PID formula. This rotation angle signal then controls the drive mechanism, rotating the ball valve to adjust the contact area between the ball valve outlet and the inlet of the first cooling water inlet pipe 2, thereby regulating the cooling water flow into the intercooler 1 and, consequently, the intake air temperature.

[0063] It can be seen that the present invention can adjust the required intake temperature according to different fuels and working conditions, and can optimize the intake temperature conditions under different fuels in the dual-fuel system, so that the engine can achieve the best combustion state regardless of which fuel or mixed fuel is burned; by controlling the temperature of the intercooler 1, the problem of low methanol substitution rate in methanol-diesel dual fuel is solved, and the methanol-diesel ratio is achieved to the most economical state.

[0064] Example 2:

[0065] like Figure 1 As shown, an intercooler temperature control system for a methanol-diesel dual-fuel engine includes an electronic control unit, an intercooler 1, a first cooling water inlet pipe 2 and a cooling water outlet pipe 6 respectively connected to the intercooler 1, a thermal management valve device 3, a second cooling water pipe and a return pipe 5, the thermal management valve device 3 is respectively connected to the first cooling water inlet pipe 2, the second cooling water inlet pipe 4 and the return pipe 5, and the return pipe 5 is also connected to the cooling water outlet pipe 6; the thermal management valve device 3 includes a ball valve and a driving mechanism for driving the ball valve to rotate, the ball valve is respectively connected to the water inlet of the first cooling water inlet pipe 2, the water outlet of the second cooling water inlet pipe 4 and the water inlet of the return pipe 5, the driving mechanism is communicatively connected to the electronic control unit, and in this embodiment, the electronic control unit can be communicatively connected to the driving mechanism via a CAN communication unit.

[0066] The control system also includes a PID adjustment unit and a temperature detection unit electrically connected to the electronic control unit. The temperature detection unit includes a temperature sensor 8 arranged on the outlet side of the intercooler 1. The temperature detection unit collects the real-time temperature of the intake air and transmits the corresponding temperature signal to the electronic control unit. The electronic control unit controls the driving mechanism to drive the rotation of the ball valve according to the received temperature signal, adjusts the amount of cooling water entering the intercooler 1, and thus adjusts the intake air temperature.

[0067] Specifically, after receiving the temperature signal, the electronic control unit calculates the temperature difference between the real-time intake air temperature and the target temperature, and transmits the corresponding temperature difference signal to the PID adjustment unit. The PID adjustment unit uses the formula: Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number; the PID control unit transmits the rotation angle U k The corresponding adjustment signal is transmitted to the electronic control unit. Based on the received adjustment signal, the electronic control unit controls the drive mechanism to rotate the ball valve, thereby adjusting the amount of cooling water entering the first cooling water inlet pipe 2 to regulate the intake air temperature. In one preferred embodiment, the electronic control unit activates the PID adjustment unit to adjust the intake air temperature when the temperature difference is not less than 3°C. If the temperature difference is less than 3°C, PID adjustment is not performed until the temperature difference is not less than 3°C.

[0068] In this embodiment, the control system further includes a preset unit electrically connected to the electronic control unit for calibrating K according to the real-time temperature of the intake air. p , K i and K d It is the limit value; it is used to calibrate K according to the time when the real-time intake temperature reaches the target temperature. p , K i and K d ; and / or; used to calibrate K according to the real-time intake air temperature p , K i and K d .

[0069] like Figure 1 As shown, the control system of the present invention primarily incorporates a thermal management valve device 3 between the first cooling water inlet pipe 2 and the second cooling water inlet pipe 4 of the intercooler 1, and a return pipe 5 between the thermal management valve device 3 and the cooling water outlet pipe 6. The electronic control unit controls the cooling water flow rate entering the intercooler 1, thereby controlling the intercooler intake air temperature, by adjusting the opening of the thermal management valve device 3 (equivalent to adjusting the opening of the first cooling water inlet pipe 2). The first cooling water inlet pipe 2 and the return pipe 5 are arranged perpendicularly. A drive mechanism drives a connecting rod to rotate a ball valve. By adjusting the overlap between the ball valve outlet and the inlet of the first cooling water inlet pipe 2, the cooling water flow rate entering the first cooling water inlet pipe 2 is controlled.

[0070] The present invention has the following situations according to the fuel state:

[0071] When the engine is operating in diesel mode, the intercooler 1 should reduce the intake air temperature to its maximum capacity. At this time, the driving mechanism drives the ball valve of the thermal management valve device 3 to rotate until the water outlet of the ball valve coincides with the water inlet of the first cooling water inlet pipe 2. At this time, all the cooling water flows through the intercooler 1. In this mode, the ball valve of the thermal management valve device 3 remains stationary.

[0072] When the engine operates in methanol-diesel mixed fuel mode, the drive mechanism adjusts the water flow into the intercooler 1 by adjusting the interface angle between the water outlet of the ball valve and the water inlet of the first cooling water inlet pipe 2, thereby adjusting the air intake temperature of the air cooler.

[0073] When the engine is started, the water and intake air temperatures are relatively low. The ball valve outlet overlaps slightly with the inlet of first cooling water inlet pipe 2, allowing a small amount of cooling water to enter intercooler 1 while the majority of the cooling water is discharged directly through return pipe 5. As the engine intake air temperature increases, the drive mechanism rotates the ball valve, increasing the overlap between the ball valve outlet and the inlet of first cooling water inlet pipe 2. This increases the cooling capacity of intercooler 1 and regulates the intake air temperature to the target.

[0074] It can be seen that the control system of the present invention has the advantages of simple structure and easy operation. It can adjust the required intake temperature according to different fuels and working conditions, and can optimize the intake temperature conditions under different fuels in the dual-fuel system, so that the engine can achieve the best combustion state regardless of which fuel or mixed fuel is burned; by controlling the temperature of the intercooler 1, the problem of low methanol substitution rate in methanol-diesel dual fuel can be solved, and the methanol-diesel ratio can be achieved to the most economical state.

[0075] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, as well as improvements to the intercooler temperature control method and system of the same methanol-diesel dual-fuel engine, should be included in the scope of protection of the present invention.

Claims

1. A method for controlling the intercooling temperature of a methanol-diesel dual-fuel engine, characterized in that: An intercooler temperature control system for a methanol-diesel dual-fuel engine includes an intercooler, a thermal management valve device, a first cooling water inlet pipe, a second cooling water inlet pipe, a cooling water outlet pipe, and a return pipe. The first cooling water inlet pipe connects the intercooler water inlet and the thermal management valve device. The thermal management valve device is also connected to the second cooling water inlet pipe. The cooling water outlet pipe is connected to the intercooler water outlet. The return pipe connects the thermal management valve device and the cooling water outlet pipe. The thermal management valve device also includes a ball valve and a drive mechanism that drives the ball valve to rotate. The control method comprises the following steps: S10, obtaining the fuel status of the engine; S20, determining whether the fuel state is a pure diesel state or a dual fuel state; S30, if the fuel is pure diesel, controlling the thermal management valve device to fully open, so that all the cooling water enters the first cooling water inlet pipe; S40: If it is a dual fuel state, obtain the intake air temperature and the target temperature; S50, calculating a temperature difference based on the intake air temperature and the target temperature; S60, generating a corresponding rotation angle signal according to the temperature difference; S70, controlling the rotation of the ball valve of the thermal management valve device according to the rotation angle signal to adjust the opening of the thermal management valve device; The S60 includes the following steps: S61. Determine whether the temperature difference is not less than 3°C based on the temperature difference; S62. If yes, use the PID formula based on the temperature difference: Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number; S63, according to the rotation angle U k , generating a corresponding rotation angle signal; S64: If no, execute S61.

2. The intercooler temperature control method for a methanol-diesel dual-fuel engine according to claim 1, characterized in that: Before S10, the following steps are also included: Determine whether the engine is in the starting state; If yes, the water outlet of the ball valve of the thermal management valve device is controlled to contact with the water inlet of the first cooling water inlet pipe in a small area.

3. The intercooler temperature control method for a methanol-diesel dual-fuel engine according to claim 1, characterized in that: The driving mechanism includes a motor and a connecting rod connected to the output shaft of the motor, and the connecting rod is connected to the ball valve of the thermal management valve device; When the rotation angle U k When the angle U is greater than 0, the motor of the driving mechanism rotates forward. k When it is less than 0, the drive mechanism motor reverses.

4. The intercooler temperature control method for a methanol-diesel dual-fuel engine according to claim 1, characterized in that: K p , K i and K d is the limit value calibrated according to the real-time intake air temperature; K p , K i and K d A coefficient calibrated according to the time it takes for the intake air real-time temperature to reach the target temperature; and / or; K p , K i and K d It is a coefficient calibrated according to the real-time intake air temperature.

5. An intercooler temperature control system for a methanol-diesel dual-fuel engine, comprising an electronic control unit, an intercooler, and a first cooling water inlet pipe and a cooling water outlet pipe respectively connected to the intercooler, characterized in that: The system further includes a thermal management valve device, a second cooling water inlet pipe and a return pipe, wherein the thermal management valve device is connected to the first cooling water inlet pipe, the second cooling water inlet pipe and the return pipe respectively, and the return pipe is also connected to the cooling water outlet pipe; The thermal management valve device includes a ball valve and a driving mechanism for driving the ball valve to rotate, the ball valve is respectively connected to the water inlet of the first cooling water inlet pipe, the water outlet of the second cooling water inlet pipe, and the water inlet of the return pipe, and the driving mechanism is communicatively connected to the electronic control unit; The control system further includes a temperature detection unit electrically connected to the electronic control unit, the temperature detection unit collecting real-time intake air temperature and transmitting a corresponding temperature signal to the electronic control unit. The electronic control unit controls the driving mechanism to drive the rotation of the ball valve based on the received temperature signal, thereby adjusting the amount of cooling water entering the intercooler to regulate the intake air temperature. After receiving the temperature signal, the electronic control unit calculates the temperature difference between the real-time intake air temperature and the target temperature; The control system further includes a PID adjustment unit electrically connected to the electronic control unit, and the PID adjustment unit uses the formula: Calculate the rotation angle U of the ball valve k , where K p , K i and K d are calibration coefficients, err(k) is the temperature difference, and k is a natural number; The PID adjustment unit transmits the rotation angle U k The corresponding adjustment signal is sent to the electronic control unit, and the electronic control unit controls the driving mechanism to drive the ball valve to rotate according to the received adjustment signal, thereby adjusting the amount of cooling water entering the intercooler to adjust the intake air temperature.

6. The intercooler temperature control system of the methanol-diesel dual-fuel engine according to claim 5, characterized in that: When the temperature difference is not less than 3°C, the electronic control unit starts the PID adjustment unit to adjust the intake air temperature.

7. The intercooler temperature control system of a methanol-diesel dual-fuel engine according to claim 5, characterized in that: The control system further comprises a preset unit electrically connected to the electronic control unit, wherein the preset unit is used to calibrate K according to the real-time temperature of the intake air. p , K i and K d is the limit value; it is used to calibrate K according to the time when the real-time intake temperature reaches the target temperature. p , K i and K d ; and / or; used to calibrate K according to the real-time intake air temperature p , K i and K d .

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