Engine cylinder sleeve cooling temperature control device and control method

Abstract

The invention discloses an engine cylinder sleeve cooling temperature control device and method. The device comprises a shell, a control unit and a parameter detection unit, and a first electric control reversing valve and a second electric control reversing valve are arranged in the shell; in actual use, the parameter detection unit detects working parameters of the temperature control device in real time, converts the working parameters into corresponding detection signals and transmits the detection signals to the control unit, and the control unit compares the detection signals with preset parameters and controls the first electric control reversing valve switch and the second electric control reversing valve switch according to comparison results. The water flow direction in the temperature control device is adjusted, so that the water temperature in the temperature control device is kept within a preset range. It can be seen that the opening and closing of the two electric control reversing valves can be automatically adjusted according to the actual working parameters of the temperature control device, so that the water temperature in the temperature control device is constant, the pollution or corrosion condition of the wall face of the cylinder sleeve is improved, and the advantages of being easy to operate, low in cost and easy to achieve are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an engine cylinder liner cooling temperature control device and a control method thereof. Background Art

[0002] For traditional engines, whether under high load or low load, the high-temperature water on one side of the cylinder liner is generally controlled at 85°C. When the engine is running under high load, the cylinder liner temperature is relatively high, which is prone to accumulating oil dirt and polluting the wall surface; when the engine is running under low load, the cylinder liner temperature is relatively low, which is prone to wall surface corrosion.

[0003] In view of the above technical problems, an engine cylinder liner cooling temperature control device appears in the prior art. Although the engine cylinder liner cooling temperature control device solves the above technical problems, its structure is complex and the operation is cumbersome, and it fails to keep the water temperature in the engine cylinder liner cooling temperature control device constant through automatic adjustment. Summary of the Invention

[0004] In view of the above deficiencies, the technical problem to be solved by the present invention is: to provide an engine cylinder liner cooling temperature control device and a control method thereof, which can automatically adjust the switches of two electric control reversing valves according to the actual working parameters of the temperature control device, so as to keep the water temperature in the temperature control device constant, and further improve the situation of cylinder liner wall surface pollution or corrosion.

[0005] To solve the above technical problems, the technical solution of the present invention is:

[0006] An engine cylinder liner cooling temperature control device includes a housing, on which an inlet, a first outlet and a second outlet are provided. The inlet is connected to the cylinder head outlet, and the second outlet is connected to the cylinder liner inlet. The housing further includes a first electric control reversing valve, a second electric control reversing valve, an inlet water chamber, a first outlet water chamber, a first bypass water chamber, a second outlet water chamber and a second bypass water chamber. The first electric control reversing valve is respectively communicated with the inlet water chamber, the first bypass water chamber and the first outlet water chamber. The inlet water chamber is communicated with the inlet. The first outlet water chamber and the first bypass water chamber are respectively communicated with the first outlet. The second electric control reversing valve is respectively communicated with the inlet water chamber, the second bypass water chamber and the second outlet water chamber. The second outlet water chamber and the second bypass water chamber are respectively communicated with the second outlet. The device further includes a control unit and a parameter detection unit which are electrically connected. The control unit is respectively electrically connected to the first electric control reversing valve and the second electric control reversing valve. The parameter detection unit is used to detect the working parameters of the engine cylinder liner cooling temperature control device, convert them into corresponding detection signals and transmit them to the control unit, and the control unit controls the first electric control reversing valve and the second electric control reversing valve according to the received detection signals.

[0007] Preferably, the parameter detection unit is a temperature detection unit. The temperature detection unit detects the temperature inside the housing, converts it into a corresponding temperature signal, and then transmits it to the control unit. The control unit controls the first electrically controlled reversing valve and the second electrically controlled reversing valve according to the temperature signal.

[0008] Preferably, the temperature detection unit includes a temperature sensor disposed in the second water outlet cavity. The control unit controls the switches of the first electrically controlled reversing valve and the second electrically controlled reversing valve according to the temperature signal detected by the temperature sensor, so that the water temperature inside the housing is within a preset range.

[0009] Preferably, the first electrically controlled reversing valve and the second electrically controlled reversing valve are arranged opposite to each other.

[0010] A control method for an engine cylinder liner cooling temperature control device is applied to the above-mentioned engine cylinder liner cooling temperature control device. The control method includes the following steps:

[0011] S10. Obtain the working parameters of the engine cylinder liner cooling temperature control device;

[0012] S20. Compare the working parameters with a preset parameter threshold;

[0013] S30. Generate a corresponding first control signal according to the comparison result;

[0014] S40. Control the switch of the first electrically controlled reversing valve and the switch of the second electrically controlled reversing valve according to the first control signal, so that the water temperature in the engine cylinder liner cooling temperature control device is within a preset range.

[0015] Preferably, S10 further includes: obtaining the current operating state of the engine;

[0016] S20 further includes: matching the operating state with a preset state;

[0017] S30 further includes: if the operating state matches the preset state, generating a corresponding second control signal;

[0018] S40 further includes: controlling the switch of the first electrically controlled reversing valve and the switch of the second electrically controlled reversing valve according to the second control signal.

[0019] Preferably, the working parameter is the temperature signal inside the housing of the engine cylinder liner cooling temperature control device;

[0020] S20 further includes: judging whether the temperature signal exists;

[0021] If the temperature signal does not exist, generate a corresponding alarm signal and execute S50;

[0022] S50. Issue a warning according to the alarm signal.

[0023] Preferably, the S10 further includes: determining whether a human - machine interaction signal is received;

[0024] If a human - machine interaction signal is received, generate a corresponding third control signal and execute S40;

[0025] The S40 further includes: controlling the first electro - controlled reversing valve switch and the second electro - controlled reversing valve switch according to the third control signal.

[0026] Preferably, the preset state includes a high - load state and a low - load state;

[0027] The S30 further includes:

[0028] If the operating state matches the high - load state, generate a corresponding high second control signal;

[0029] If the operating state matches the low - load state, generate a corresponding low second control signal;

[0030] The S40 further includes:

[0031] Control the first electro - controlled reversing valve to be fully open and control the second electro - controlled reversing valve to be closed according to the high second control signal;

[0032] Control the first electro - controlled reversing valve to be closed and control the second electro - controlled reversing valve to be fully open according to the low second control signal.

[0033] Preferably, in the S10, the step of obtaining the current operating state of the engine includes:

[0034] Obtain the engine supercharger speed and the single - cylinder exhaust temperature signal;

[0035] In the S20, the step of matching the operating state with the preset state includes:

[0036] Judge whether the supercharger speed is greater than a preset first speed value, and judge whether the supercharger speed is less than a preset second speed value;

[0037] Judge whether the single - cylinder exhaust temperature signal is greater than a preset first exhaust temperature value, and judge whether the single - cylinder exhaust temperature signal is less than a preset second exhaust temperature value;

[0038] The S30 further includes: If the supercharger speed is greater than the first speed value, or the single - cylinder exhaust temperature signal is greater than the first exhaust temperature value, then the operating state matches the high - load state;

[0039] If the supercharger speed is less than the second speed value, or the single - cylinder exhaust temperature signal is less than the second exhaust temperature value, then the operating state matches the low - load state.

[0040] After adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0041] Due to the engine cylinder liner cooling temperature control device and control method of the present invention, the device includes a housing, a control unit and a parameter detection unit. A first electronically controlled reversing valve and a second electronically controlled reversing valve are arranged in the housing. During actual use, the parameter detection unit detects the working parameters of the temperature control device in real time, converts the working parameters into corresponding detection signals, and then transmits them to the control unit. The control unit compares the detection signals with the preset parameters, and according to the comparison results, controls the switches of the first electronically controlled reversing valve and the second electronically controlled reversing valve to adjust the water flow direction in the temperature control device, so that the water temperature in the temperature control device of the present invention is maintained within the preset range. It can be seen that the present invention can automatically adjust the switches of the two electronically controlled reversing valves according to the actual working parameters of the temperature control device, thereby making the water temperature in the temperature control device constant, further improving the situation of cylinder liner wall pollution or corrosion, and having the advantages of simple operation, low cost and easy implementation. Description of the Drawings

[0042] Figure 1 is a schematic structural diagram of the engine cylinder liner cooling temperature control device in the present invention;

[0043] Figure 2 is a schematic structural diagram of the engine cylinder liner cooling temperature control device under low engine load;

[0044] Figure 3 is a schematic structural diagram of the engine cylinder liner cooling temperature control device under high engine load;

[0045] Figure 4 is a schematic flow chart of controlling according to the temperature signal in the second embodiment;

[0046] Figure 5 is a schematic flow chart of controlling according to the engine operating state in the second embodiment;

[0047] In the figure: 1 - housing, 10 - water inlet, 11 - first water outlet, 12 - second water outlet, 2 - first electronically controlled reversing valve, 3 - second electronically controlled reversing valve, 4 - temperature sensor, a - inlet water chamber, b - first bypass water chamber, c - first outlet water chamber, d - second bypass water chamber, e - second outlet water chamber. Detailed Embodiments

[0048] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0049] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] As Figure 1 、 Figure 2 and Figure 3 shown, an engine cylinder liner cooling temperature control device includes a housing 1. An inlet 10, a first outlet 11 and a second outlet 12 are provided on the housing 1. The inlet 10 is connected to the cylinder head outlet, the first outlet 11 is connected to the engine cooler, and the second outlet 12 is connected to the cylinder liner inlet 10. A first electrically controlled reversing valve 2, a second electrically controlled reversing valve 3, an inlet water chamber a, a first outlet water chamber c, a first bypass water chamber b, a second outlet water chamber e and a second bypass water chamber d are further provided inside the housing 1. In this embodiment, the first electrically controlled reversing valve 2 and the second electrically controlled reversing valve 3 are oppositely arranged. The first outlet 11 and the second outlet 12 are located on one side of the housing 1, and the inlet 10 is located on the other side of the housing 1.

[0052] The first electrically controlled reversing valve 2 is respectively communicated with the inlet water chamber a, the first bypass water chamber b and the first outlet water chamber c. The inlet water chamber a is communicated with the inlet 10. The first outlet water chamber c and the first bypass water chamber b are respectively communicated with the first outlet 11. The first outlet 11 is connected to the cooler of the engine. By controlling the opening and closing of the first electrically controlled reversing valve 2, the water flow rate into the cooler of the engine can be adjusted.

[0053] The second electrically controlled reversing valve 3 is respectively communicated with the inlet water chamber a, the second bypass water chamber d and the second outlet water chamber e. The second outlet water chamber e and the second bypass water chamber d are respectively communicated with the second outlet 12. By controlling the opening and closing of the second electrically controlled reversing valve 3, the water flow rate into the cylinder liner can be adjusted.

[0054] The engine cylinder liner cooling temperature control device of the present invention further includes a control unit and a parameter detection unit that are electrically connected. The control unit is electrically connected to the first electrically controlled reversing valve 2 and the second electrically controlled reversing valve 3 respectively. The parameter detection unit is used to detect the working parameters of the engine cylinder liner cooling temperature control device, convert them into corresponding detection signals and transmit them to the control unit. The control unit controls the switching of the first electrically controlled reversing valve 2 and the second electrically controlled reversing valve 3 according to the received detection signals.

[0055] In this embodiment, the parameter detection unit can be, but is not limited to, a temperature detection unit. The temperature detection unit detects the temperature inside the housing 1, converts it into a corresponding temperature signal and transmits it to the control unit. The control unit controls the switching of the first electrically controlled reversing valve 2 and the second electrically controlled reversing valve 3 according to the temperature signal.

[0056] The temperature detection unit includes a temperature sensor 4 arranged in the second water outlet chamber e. The control unit controls the switching of the first electrically controlled reversing valve 2 and the second electrically controlled reversing valve 3 according to the temperature signal detected by the temperature sensor 4, so that the water temperature inside the housing 1 is maintained within a preset range. In this embodiment, a groove is provided on the inner wall of the housing 1 in the second water outlet chamber e, and the detection end of the temperature sensor 4 is arranged in the groove.

[0057] The working process of the engine cylinder liner cooling temperature control device of the present invention is specifically as follows:

[0058] As Figure 2 shown, when the temperature signal t0 detected by the temperature sensor 4 is greater than or equal to the preset temperature signal t1, the control unit controls the first electrically controlled reversing valve 2 to perform a gradual closing action. After being fully closed, the water inlet chamber a, the first bypass water chamber b, and the first water outlet chamber c can be connected, that is, the bypass route is opened, and the water flow rate of this bypass route is small. At the same time, the control unit controls the second electrically controlled reversing valve 3 to perform a gradual opening operation. After being fully opened, the water inlet chamber a and the second water outlet chamber e can be connected, that is, the main route is opened, and the second bypass water chamber d is closed. At this time, the water flow rate to the cylinder liner is large and the temperature is high, thus solving the technical problem that the cylinder liner is prone to wall corrosion due to low temperature.

[0059] As Figure 3 shown, when the temperature signal t0 detected by the temperature sensor 4 is less than or equal to the preset temperature signal t2, t1>t2, the control unit controls the first electrically controlled reversing valve 2 to perform a gradual opening action. After being fully opened, the water inlet chamber a and the first water outlet chamber c can be connected, that is, the main route is opened, and the first bypass water chamber b is closed. The water flow rate to the cooler is large. At the same time, the control unit controls the second electrically controlled reversing valve 3 to perform a gradual closing operation. After being fully closed, the water inlet chamber a, the second bypass water chamber d, and the second water outlet chamber e can be connected, that is, the bypass route is opened, and the water flow rate of this route is small. The water flow to the cylinder liner is small and the temperature is low, thus solving the technical problem that the cylinder liner is prone to accumulate oil dirt and pollute the wall surface due to high temperature.

[0060] It can be seen that for the engine cylinder liner cooling temperature control device of the present invention, according to the temperature signal detected by the temperature sensor 4, the first electronically controlled reversing valve 2 and the second electronically controlled reversing valve 3 are controlled to gradually open and close, thereby controlling the water flow rates of the main water circuit and the bypass water circuit, so that the water temperature in the housing 1 is maintained within a preset range, and further the water temperature flowing to the cylinder liner is always maintained within the corresponding range, improving the situation of pollution or corrosion on the cylinder liner wall surface. The present invention has the advantages of simple structure, easy implementation and low cost.

[0061] Embodiment 2:

[0062] A control method for an engine cylinder liner cooling temperature control device, which is applied to the engine cylinder liner cooling temperature control device of Embodiment 1, and the control method includes the following steps:

[0063] Step S10: Obtain the working parameters of the engine cylinder liner cooling temperature control device;

[0064] Step S20: Compare the working parameters with the preset parameter thresholds;

[0065] Step S30: Generate a corresponding first control signal according to the comparison result;

[0066] Step S40: Control the first electronically controlled reversing valve switch and the second electronically controlled reversing valve switch according to the first control signal, so that the water temperature in the engine cylinder liner cooling temperature control device is within a preset range.

[0067] The control method of the present invention mainly controls the first electronically controlled reversing valve switch and the second electronically controlled reversing valve switch by detecting the working parameters of the engine cylinder liner cooling temperature control device in real time, so as to always keep the water temperature flowing to the cylinder liner within the corresponding range.

[0068] When the working parameter can be but is not limited to the temperature signal in the housing, the control method of the present invention is specifically as follows:

[0069] Obtain the temperature signal t0 in the housing of the engine cylinder liner cooling temperature control device, and judge whether the relational expression t2 ≤ t0 ≤ t1 holds.

[0070] If t0 ≥ t1, it indicates that the water temperature in the housing of the engine cylinder liner cooling temperature control device is relatively high, then the generated first control signal is: control the first electronically controlled reversing valve to gradually open, gradually close the second electronically controlled reversing valve, and maintain this state, and the water temperature decreases.

[0071] During this process, obtain the temperature signal t0, and then judge whether the relational expression t2 ≤ t0 < t holds, where t2 < t < t1. If the relational expression t2 ≤ t0 < t holds, it operates normally.

[0072] If the relational expression t2 ≤ t0 < t does not hold, then judge whether the relational expression t2 ≤ t0 ≤ t1 holds.

[0073] If t0 ≤ t2, the generated first control signal is: controlling the first electrically controlled reversing valve to close gradually, opening the second electrically controlled reversing valve gradually, and maintaining this state, so that the water temperature rises.

[0074] During this process, obtain the temperature signal t0, and then judge whether the relational expression t2 ≤ t0 < t holds. If the relational expression t1 ≥ t0 > t holds, operate normally. If the relational expression t1 ≥ t0 > t does not hold, then judge whether the relational expression t2 ≤ t0 ≤ t1 holds, and repeat the above steps.

[0075] It can be seen that the control method of the present invention can automatically control the water temperature flowing to the cylinder liner within a corresponding range, thereby improving the situation of pollution or corrosion on the cylinder liner wall surface. At the same time, the present invention realizes automatic control and adjustment, has simple operation, is easy to implement, and can be widely applied. Of course, the working parameter can be the water flow rate.

[0076] In this embodiment, the cooling temperature control device of the engine cylinder liner can be controlled according to the operating state of the engine. Then, the control method of the present invention is specifically as follows:

[0077] Step S10: Obtain the current operating state of the engine;

[0078] Step S20: Match the operating state with the preset state;

[0079] Step S30: If the operating state matches the preset state, generate a corresponding second control signal;

[0080] Step S40: According to the second control signal, control the opening and closing of the first electrically controlled reversing valve and control the opening and closing of the second electrically controlled reversing valve.

[0081] As Figure 5 shown, when the preset state includes a high-load state and a low-load state, the control method of the present invention is specifically as follows:

[0082] Step S10: Obtain the supercharger speed n0 of the engine and the single-cylinder exhaust temperature signal T0;

[0083] Step S20: Judge whether the supercharger speed n0 is greater than the preset first speed value n1,

[0084] Judge whether the supercharger speed n0 is less than the preset second speed value n2;

[0085] Judge whether the single-cylinder exhaust temperature signal T0 is greater than the preset first exhaust temperature value T1,

[0086] Judge whether the single-cylinder exhaust temperature signal T0 is less than the preset second exhaust temperature value T2;

[0087] Step S30: If the supercharger speed n0 is greater than the first speed value n1, or the single-cylinder exhaust temperature signal T0 is greater than the first exhaust temperature value T1, then the operating state matches the high-load state;

[0088] If the operating state matches the high-load state, generate the corresponding high second control signal;

[0089] If the supercharger speed n0 is less than the second speed value n2, or the single-cylinder exhaust temperature signal T0 is less than the second exhaust temperature value T2, then the operating state matches the low-load state;

[0090] If the operating state matches the low-load state, generate the corresponding low second control signal.

[0091] Step S40: According to the high second control signal, control the first electric control reversing valve to be fully open and control the second electric control reversing valve to be closed;

[0092] According to the low second control signal, control the first electric control reversing valve to be closed and control the second electric control reversing valve to be fully open.

[0093] Through the above steps, the present invention automatically controls the opening and closing of the first electric control reversing valve and the second electric control reversing valve according to the operating state of the engine, such as high load and low load, so as to adjust the water flow direction in the housing of the engine cylinder liner cooling temperature control device.

[0094] Specifically refer to Figure 2 , when the engine operates in the low-load state, the first electric control reversing valve makes a gradual closing action. After being fully closed, it can connect the water inlet cavity a, the first bypass water cavity b, and the first water outlet cavity c, that is, open the bypass route. The water flow of this bypass route is small; at the same time, the second electric control reversing valve makes a gradual opening operation. After being fully opened, it can connect the water inlet cavity a and the second water outlet cavity e, that is, open the main route and close the second bypass water cavity d. At this time, the water flow to the cylinder liner of the engine cylinder liner cooling temperature control device is large and the temperature is high, thus solving the technical problem that the cylinder liner temperature is too low and prone to wall corrosion.

[0095] Specifically refer to Figure 3 , when the engine operates in the high-load state, the first electric control reversing valve makes a gradual opening action. After being fully opened, it can connect the water inlet cavity a and the first water outlet cavity c, that is, open the main route and close the first bypass water cavity b. The water flow to the cooler is large; at the same time, the second electric control reversing valve makes a gradual closing operation. After being fully closed, it can connect the water inlet cavity a, the second bypass water cavity d, and the second water outlet cavity e, that is, open the bypass route. The water flow of this route is small, and the water flow to the cylinder liner is small and the temperature is low, thus solving the technical problem that the cylinder liner temperature is too high and prone to oil scale accumulation and wall pollution.

[0096] Such as Figure 4As shown, when the working parameter is the temperature signal inside the housing of the engine cylinder liner cooling temperature control device, the control method of the present invention is specifically as follows:

[0097] Step S10: Obtain the temperature signal inside the housing of the engine cylinder liner cooling temperature control device;

[0098] Step S20: Determine whether the temperature signal exists;

[0099] If the temperature signal does not exist, generate a corresponding alarm signal and execute S50;

[0100] Step S50: Issue a warning according to the alarm signal.

[0101] When it is detected that there is no temperature signal, it indicates that there is a fault in the temperature sensor or other situations. At this time, a warning needs to be issued to notify the user that there is a fault in the engine cylinder liner cooling temperature control device at this time, so as to time the processing and avoid the expansion of the fault.

[0102] The engine cylinder liner cooling temperature control device of the present invention can also be controlled by using a human-machine interaction signal. The control method specifically includes:

[0103] Step S10 further includes: determining whether a human-machine interaction signal is received;

[0104] If a human-machine interaction signal is received, generate a corresponding third control signal and execute S40;

[0105] Step S40: Control the first electrically controlled reversing valve and the second electrically controlled reversing valve according to the third control signal.

[0106] By using the human-machine interaction unit of the engine, or by setting a human-machine interaction unit on the engine cylinder liner cooling temperature control device, inputting a human-machine interaction signal, the human-machine interaction unit can include a touch screen, buttons, etc., and can be input through the human-machine interaction unit to control the opening and closing of the first electrically controlled reversing valve and the second electrically controlled reversing valve. In this way, the engine cylinder liner cooling temperature control device can meet various usage requirements and is suitable for different application scenarios.

[0107] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An engine cylinder liner cooling temperature control device, comprising a housing, the housing being provided with a water inlet, a first water outlet, and a second water outlet, the water inlet being connected to a cylinder head water outlet, the second water outlet being connected to a cylinder liner water inlet, characterized in that: The shell is further provided with a first electrically controlled reversing valve, a second electrically controlled reversing valve, a water inlet water chamber, a first water outlet water chamber, a first bypass water chamber, a second water outlet water chamber, and a second bypass water chamber. The first electrically controlled reversing valve is respectively connected with the water inlet water chamber, the first bypass water chamber, and the first water outlet water chamber. The water inlet water chamber is connected with the water inlet. The first water outlet water chamber and the first bypass water chamber are respectively connected with the first water outlet. The second electrically controlled reversing valve is respectively connected with the water inlet water chamber, the second bypass water chamber, and the second water outlet water chamber. The second water outlet water chamber and the second bypass water chamber are respectively connected with the second water outlet. The device also includes an electrically connected control unit and a parameter detection unit, the control unit is electrically connected to the first electrically controlled reversing valve and the second electrically controlled reversing valve respectively, the parameter detection unit is used to detect the working parameters of the engine cylinder liner cooling temperature control device, convert them into corresponding detection signals and transmit them to the control unit, and the control unit controls the first electrically controlled reversing valve and the second electrically controlled reversing valve according to the received detection signals.

2. The engine cylinder liner cooling temperature control device according to claim 1, characterized in that: The parameter detection unit is a temperature detection unit, which detects the temperature inside the shell, converts it into a corresponding temperature signal and then transmits it to the control unit. The control unit controls the first electrically controlled reversing valve and the second electrically controlled reversing valve according to the temperature signal.

3. The engine cylinder liner cooling temperature control device according to claim 2, characterized in that: The temperature detection unit includes a temperature sensor arranged in the second water outlet cavity. The control unit controls the first electrically controlled reversing valve switch and the second electrically controlled reversing valve switch according to the temperature signal detected by the temperature sensor, so that the water temperature in the shell is within a preset range.

4. The engine cylinder liner cooling temperature control device according to claim 1, characterized in that: The first electrically controlled reversing valve and the second electrically controlled reversing valve are arranged opposite to each other.

5. A control method for an engine cylinder liner cooling temperature control device, characterized in that: Applicable to the engine cylinder liner cooling temperature control device according to any one of claims 1 to 4, the control method comprises the following steps: S10, obtaining working parameters of the engine cylinder liner cooling temperature control device; S20, comparing the working parameter with a preset parameter threshold; S30, generating a corresponding first control signal according to the comparison result; S40, according to the first control signal, controlling the switch of the first electrically controlled reversing valve and the switch of the second electrically controlled reversing valve, so that the water temperature in the engine cylinder liner cooling temperature control device is within a preset range.

6. The control method of the engine cylinder liner cooling temperature control device according to claim 5, characterized in that: The S10 further includes: obtaining the current operating state of the engine; The S20 further includes: matching the operating state with a preset state; The S30 further includes: if the operating state matches the preset state, generating a corresponding second control signal; The step S40 further includes: controlling the switch of the first electrically controlled reversing valve and the switch of the second electrically controlled reversing valve according to the second control signal.

7. The control method of the engine cylinder liner cooling temperature control device according to claim 5, characterized in that: The working parameter is a temperature signal in the housing of the engine cylinder liner cooling temperature control device; The S20 further includes: determining whether a temperature signal exists; If the temperature signal does not exist, a corresponding alarm signal is generated and S50 is executed; S50: issuing a warning according to the alarm signal.

8. The control method of the engine cylinder liner cooling temperature control device according to claim 5, characterized in that: The S10 further includes: determining whether a human-computer interaction signal is received; If a human-machine interaction signal is received, a corresponding third control signal is generated, and S40 is executed; The S40 further includes: controlling the first electrically controlled reversing valve switch and the second electrically controlled reversing valve switch according to the third control signal.

9. The control method of the engine cylinder liner cooling temperature control device according to claim 6, characterized in that: The preset state includes a high load state and a low load state; The S30 further includes: If the operating state matches the high load state, generating a corresponding high second control signal; If the operating state matches the low load state, generating a corresponding low second control signal; The S40 further includes: According to the high second control signal, the first electrically controlled reversing valve is controlled to be fully opened and the second electrically controlled reversing valve is controlled to be closed; According to the low second control signal, the first electrically controlled reversing valve is controlled to be closed and the second electrically controlled reversing valve is controlled to be fully opened.

10. The control method of the engine cylinder liner cooling temperature control device according to claim 9, characterized in that: The step of obtaining the current operating state of the engine in S10 includes: Obtain engine supercharger speed and single cylinder exhaust temperature signals; The step of matching the running state with the preset state in S20 includes: Determine whether the supercharger speed is greater than a preset first speed value, and determine whether the supercharger speed is less than a preset second speed value; Determine whether the single cylinder exhaust temperature signal is greater than a preset first exhaust temperature value, and determine whether the single cylinder exhaust temperature signal is less than a preset second exhaust temperature value; The step S30 further includes: if the supercharger speed is greater than the first speed value, or the single cylinder exhaust temperature signal is greater than the first exhaust temperature value, then the operating state matches the high load state; If the supercharger speed is less than the second speed value, or the single cylinder exhaust temperature signal is less than the second exhaust temperature value, then the operating state matches the low load state.

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