An engine external thermostat cooling circulation system, a control method, and a thermostat damage determination method

Abstract

The application discloses an engine external thermostat cooling circulation system, a control method and a thermostat damage determination method. High / low temperature water thermostats of an engine are arranged at a water outlet of a diesel engine water supplement pipe through a test bench. When the cooling water temperature is low, the high / low temperature water thermostats are closed in large circulation, and the cooling water flows through high / low temperature water pump inlets in small circulation, so that the engine is rapidly warmed up. The arrangement of the high / low temperature thermostats improves the temperature sensing sensitivity of the cooling water and rapid adjustment. The application can solve the problems of frequent thermostat fluctuation and control delay in engine technology, avoid engine operation in a low temperature zone, reduce oil consumption, reduce damage to the engine, and prolong the service life of the engine.

Description

Technical Field

[0001] This invention specifically relates to an external engine thermostat cooling circulation system, control method, and thermostat damage determination method, belonging to the field of engine technology. Background Technology

[0002] The function of the cooling system is to maintain the engine within an appropriate temperature range under all operating conditions, preventing both overheating and excessive cold in winter. After a cold start, the cooling system must also ensure the engine warms up quickly to reach its normal operating temperature as soon as possible. Currently, the most commonly chosen device is the thermostat. The thermostat's main function is to automatically adjust the amount of coolant entering the radiator based on the coolant temperature, thereby changing the water circulation range and regulating the cooling system's heat dissipation capacity to ensure the engine operates within the appropriate temperature range.

[0003] Marine engines, compared to land-based engines, have an additional external cooling system. The cooling water used in the internal engine circulation is freshwater, not in direct contact with seawater. The hot water in the internal circulation is cooled by seawater pumped out by a seawater pump, and heat exchange takes place in a heat exchanger. Only a high-temperature thermostat is needed to meet operational requirements. Land-based engines, on the other hand, primarily rely on high / low-temperature cooling units—a process known as low-temperature freshwater cooling high-temperature freshwater. To meet operational requirements, a properly installed thermostat is necessary, avoiding frequent thermostat fluctuations and control delays. Furthermore, the engine cannot operate in low-temperature environments, as the low ambient temperature and complex engine operating conditions would lead to significant coolant temperature fluctuations, longer adjustment cycles, and increased heat loss due to heat dissipation, resulting in higher fuel consumption. Therefore, the proper arrangement and installation of an external high / low-temperature thermostat cooling system is a pressing technical challenge. Summary of the Invention

[0004] In view of the problems existing in the background technology, one of the objectives of this invention is to provide an external thermostat cooling circulation system for engines, which can solve the problems of frequent thermostat fluctuations and control delays in engine technology, avoid engine operation in low temperature areas, reduce fuel consumption, reduce damage to the engine, and extend the service life of the engine.

[0005] The second objective of this invention is to provide a control method for an external thermostat cooling circulation system of an engine.

[0006] The third objective of this invention is to provide a method for determining thermostat damage in an external thermostat cooling circulation system of an engine.

[0007] To achieve the above objectives, the present invention provides an external engine thermostat cooling circulation system, comprising a high-temperature water cooling circulation system and a low-temperature water cooling circulation system; the high-temperature water cooling circulation system includes a first water chamber and a second water chamber of a high-temperature heat dissipation unit; the outlet of the second water chamber is connected to a second water chamber outlet pipe H1, which is sequentially connected from the inlet end to the outlet end to a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, and a high-temperature compensation pipe H7; the high-temperature water pump U1... The main valve of unit 1 is connected to the first water chamber via the return water pipe H6; the auxiliary valve of the high-temperature water thermostat U1 is connected to the inlet of the high-temperature water preheater Y1 and the high-temperature water pump R1 via the small circulation return water pipe H9; the outlet of the high-temperature water preheater Y1 is connected to the inlet of the oil cooler S2 via a pipe; the outlet of the first water chamber is connected to the outlet of the second water chamber via the high-temperature compensation pipe H7; the outlet of the high-temperature compensation pipe H7 is close to the second water chamber; the high-temperature water thermostat U1 is installed on one row of the engine.

[0008] The low-temperature water cooling circulation system includes a third water chamber, a fourth water chamber, and a cooling fan F in the low-temperature heat dissipation unit. The outlet of the fourth water chamber is connected to the fourth water chamber outlet pipe A1. The fourth water chamber outlet pipe A1 is connected sequentially from the inlet to the outlet by a low-temperature water pump R2, an air cooler S2, a diesel engine water supply pipe Q, a water temperature sensor C3, and a low-temperature water thermostat U2. The main valve of the low-temperature water thermostat U2 is connected to the third water chamber via the third water chamber return pipe A4. The auxiliary valve of device U2 is connected to the inlet of cryogenic water pump R2 via cryogenic small circulation pipeline A6. A low-temperature preheater Y2 is connected to the outlet pipeline A1 of the fourth water chamber between the air cooler S2 and the water temperature sensor C3. The cooling fan F is installed on one side of the cryogenic heat dissipation unit to dissipate heat for the cryogenic heat dissipation unit. One end of the cryogenic water compensation pipe A5 is connected to the outlet of the third water chamber, and the other end is connected to the inlet of cryogenic water pump R2. The cryogenic water thermostat U2 is installed on another row of the engine.

[0009] The control system is electrically connected to the clutches of the high-temperature water preheater Y1, water temperature sensor C1, water temperature sensor C3, low-temperature water preheater Y2, and cooling fan F through control circuits.

[0010] In some embodiments, the high-temperature water cooling circulation system of the present invention further includes a high-temperature water discharge pipe H8 and a water-heated air heater. The inlet of the high-temperature water discharge pipe H8 is connected to the outlet pipe H1 of the second water chamber and is close to the inlet of the high-temperature water pump R1. The water-heated air heater is connected to the high-temperature water discharge pipe H8 through the outlet pipe H10 of the water-heated air heater. The low-temperature water cooling circulation system further includes a low-temperature water discharge pipe A7. The inlet of the low-temperature water discharge pipe A7 is connected to the outlet pipe A1 of the fourth water chamber and is close to the inlet of the low-temperature water pump R2.

[0011] In some embodiments, a high-temperature water flow meter P1 is connected to the outlet pipe H1 of the second water chamber between the second water chamber and the high-temperature water pump R1; a low-temperature water flow meter P2 is connected to the return pipe A4 of the third water chamber, and the high-temperature water flow meter P1 and the low-temperature water flow meter P2 are respectively connected to the control system through a control circuit.

[0012] In some embodiments, a displacement sensor C2 is installed on the high-temperature water thermostat U1, and a displacement sensor C4 is installed on the low-temperature water thermostat U2. The displacement sensors C2 and C4 are respectively connected to the control system via a control circuit. Furthermore, both the first and third water chambers are integrated with expansion tanks, and the expansion tanks are equipped with low-level sensors, which are electrically connected to the control system.

[0013] In some embodiments, the high-temperature water cooling circulation system of the present invention further includes a high-temperature water vent pipe H5, the air inlet of the high-temperature water vent pipe H5 is connected to the return water pipe H6 of the first water chamber and is close to the displacement sensor C2, and its air outlet is connected to the first water chamber; the low-temperature water cooling circulation system further includes a low-temperature water vent pipe A8, and the air cooler S2 is connected to the interior of the third water chamber through the low-temperature water vent pipe A8.

[0014] In some embodiments, the high-temperature thermostat U1 of the present invention is mounted on the engine via a high-temperature thermostat integrated bracket, and the low-temperature thermostat U2 is mounted on the engine via a low-temperature thermostat integrated bracket; further, the high-temperature thermostat U1 is mounted on the high-temperature thermostat integrated bracket via shock-absorbing rubber, and the low-temperature thermostat U2 is mounted on the low-temperature thermostat integrated bracket via shock-absorbing rubber.

[0015] The control method for the cooling circulation system of an external thermostat in an engine according to the present invention includes the following steps:

[0016] Before starting the engine, S1 checks if the ambient temperature is below X℃:

[0017] If so, proceed to step S2;

[0018] If not, start the engine directly;

[0019] S2 determines whether the water temperature sensor is operating successfully:

[0020] If so, the high-temperature water preheater Y1 and the low-temperature water preheater Y2 are started manually or automatically. The cooling circulating water is preheated by the high-temperature water preheater Y1 and the low-temperature water preheater Y2, and then flows into the diesel engine water supply pipe Q to preheat the engine, and then proceeds to step S3.

[0021] If not, the control system will be triggered to alarm, the staff will inspect the water temperature sensor, and then return to step S1;

[0022] S3 Let the circulating water temperature after passing through the high-temperature water thermostat U1 be H1, and the circulating water temperature after passing through the low-temperature water thermostat U2 be H2.

[0023] If H1 < 70℃, the secondary valve of the high-temperature water thermostat U1 will open, and the engine will preheat the engine through the high-temperature water small circulation system.

[0024] If 70℃≤H1≤80℃, the main valve of the high-temperature water thermostat U1 will open, and the engine will enter the high-temperature water circulation system to cool the engine.

[0025] If H1 > 80℃, it indicates that the temperature of the high-temperature water is too high, and the control system will sound an alarm.

[0026] If H2 < 27℃, the auxiliary valve of the low-temperature water thermostat U2 will open, and the engine will enter the low-temperature water small circulation system to preheat the engine.

[0027] If 27℃≤H2≤37℃, the main valve of the low-temperature water thermostat U2 will open, and the engine will enter the low-temperature water large circulation system to cool the engine.

[0028] If H2 > 37℃, it indicates that the temperature of the low-temperature water is too high, and the control system will sound an alarm.

[0029] The present invention discloses a control method for an external thermostat cooling circulation system for an engine. The high-temperature water large circulation system includes a flow meter P1 on the outlet pipe H1 of the second water chamber of the high-temperature heat dissipation unit, a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, a displacement sensor C2, an upper water chamber return pipe H6, and a high-temperature compensation pipe H7. The high-temperature water small circulation system includes a flow meter P1 on the outlet pipe H1 of the second water chamber, a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, a displacement sensor C2, a high-temperature water preheater Y1, and a high-temperature water small circulation return pipe H9.

[0030] The low-temperature water large circulation system includes the fourth water chamber outlet pipe A1 of the low-temperature heat dissipation unit, the low-temperature water pump R2, the air cooler S2, the low-temperature water preheater Y2, the water temperature sensor C3, the low-temperature water thermostat U2, the displacement sensor C4, the third water chamber return pipe A4, the low-temperature water flow meter P2, and the low-temperature compensation pipe A5; the low-temperature water small circulation system includes the fourth water chamber outlet pipe A1, the low-temperature water pump R2, the air cooler S2, the low-temperature water preheater Y2, the water temperature sensor C3, the low-temperature water thermostat U2, the displacement sensor C4, and the low-temperature water small circulation pipe A6.

[0031] The present invention provides a method for determining thermostat damage in an external thermostat cooling circulation system for an engine, comprising the following steps:

[0032] After the S1 engine has been running for T min, use an infrared thermometer to measure whether the pipes in the high-temperature water cooling circulation system are above M℃ and whether the pipes in the low-temperature water cooling circulation system are below N℃.

[0033] If so, proceed to step S2;

[0034] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged;

[0035] S2 determines whether the high-temperature water cooling system is above 80°C and whether the pipes in the low-temperature water cooling system are above 37°C when the engine coolant temperature is above 80°C.

[0036] If so, the engine will operate normally;

[0037] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

[0038] The present invention provides a method for determining thermostat damage in an external thermostat cooling circulation system for an engine, comprising the following steps:

[0039] S1 starts the engine;

[0040] S2 uses an infrared thermometer to measure the temperature of the outer casings of the high-temperature water thermostat U1 and the low-temperature water thermostat U2.

[0041] The S3 infrared thermometer displays whether the inlet temperature of the high-temperature thermostat U1 and the low-temperature thermostat U2 has risen to 70℃ (this value varies depending on the engine and can be set according to the actual situation):

[0042] If so, proceed to step S4;

[0043] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged;

[0044] S4 determines whether the engine coolant outlet temperature has increased compared to the temperature in the previous Y seconds:

[0045] If so, then the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are normal;

[0046] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

[0047] The present invention provides a method for determining thermostat damage in an external thermostat cooling circulation system for an engine, comprising the following steps:

[0048] The engine makes a knocking sound, power decreases, the high-temperature cooling unit is below W℃, and the belt of the cooling fan F is not slipping, and the fan blades of the cooling fan F are rotating normally. At this time, the large circulation of the high-temperature water cooling circulation system and the low-temperature water cooling circulation system is blocked or obstructed. This indicates that the main valves of the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are closed, but the auxiliary valves are open. That is, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are malfunctioning, and the thermostats are determined to be damaged.

[0049] The present invention provides a method for determining thermostat damage in an external thermostat cooling circulation system for an engine, comprising the following steps:

[0050] The S1 engine coolant temperature is below H℃;

[0051] S2 determines whether it is winter;

[0052] If so, the engine will not function properly;

[0053] If not, the thermostat failure will lead to thermostat damage.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] (1) The present invention arranges the high / low temperature water thermostats of the engine on a test bench at the outlet of the diesel engine water supply pipe and the air cooler. When the coolant temperature is low, the large circulation of the high / low temperature water thermostat is closed, and the coolant flows through the small circulation through the inlet of the high / low temperature water pump, so that the engine can be warmed up quickly. In addition, this arrangement of the high / low temperature thermostats improves the sensitivity of the coolant temperature and allows for rapid adjustment.

[0056] (2) In the case of high / low temperature water compensation, the exhaust direction of the exhaust port on the thermostat is towards the water outlet direction, which is more conducive to the exhaust of the engine, and the gas in the pipeline is discharged to avoid engine damage.

[0057] (3) By arranging high / low temperature water preheaters, this invention solves the problem of increased fuel consumption caused by large fluctuations in coolant temperature and long adjustment cycles due to complex changes in engine operating conditions caused by low ambient temperature when the engine is running in low temperature areas, which ultimately leads to heat loss in the engine.

[0058] (4) The thermostat of the present invention is installed on the body by an integrated bracket and is installed firmly, which effectively alleviates the problem of the thermostat control unit shaking in the shell due to water flow impact. The installation stability is greatly improved compared with the traditional thermostat. In addition, the thermostat shell is equipped with shock-absorbing blocks, which have a good anti-vibration effect and greatly improve the service life.

[0059] (5) The thermostat damage determination method of the present invention can quickly determine the problem of high / low temperature thermostats by different phenomena.

[0060] (6) The external thermostat integrated bracket of the present invention can change the installation position according to the engine layout and is applicable to various engine layouts.

[0061] (7) The present invention uses an integrated bracket to install the thermostat on the engine, which reduces the number of parts; the integrated thermostat mounting bracket has the characteristics of simple structure, space saving, convenient connection, high reliability, and easy maintenance and replacement. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the high-temperature water cooling circulation system of the engine of the present invention;

[0063] Figure 2 This is a schematic diagram of the engine cryogenic water cooling circulation system of the present invention;

[0064] Figure 3 This is a schematic diagram of the high and low temperature water thermostat assembly of the V-type engine of the present invention;

[0065] Figure 4 This is a schematic diagram of the integrated support structure for the high-temperature water thermostat of the present invention;

[0066] Figure 5 This is a schematic cross-sectional view of the integrated bracket for the high-temperature water thermostat of the present invention.

[0067] Figure 6 This is a schematic diagram of the integrated support structure for the low-temperature water thermostat of the present invention;

[0068] Figure 7 This is a schematic cross-sectional view of the integrated bracket for the low-temperature water thermostat of the present invention.

[0069] Figure 8 This is a control flowchart of the high-temperature water cooling circulation system of the present invention;

[0070] Figure 9 This is a control flowchart of the low-temperature water cooling circulation system of the present invention;

[0071] Figure 10 This is a flowchart of the thermostat damage determination method of the present invention;

[0072] In the picture:

[0073] 1. Fuel filter; U2. Low-temperature water thermostat; 3. Rubber shock absorber;

[0074] 4. Low-temperature thermostat integrated bracket; 4-1. Low-temperature thermostat support plate; 4-3. Low-temperature thermostat mounting plate; 4-4. Fuel filter mounting plate; 4-6. Low-temperature thermostat fixing plate; 4-8. Fuel leak mounting hole; 4-9. Low-temperature thermostat support positioning plate.

[0075] 7. Oil filter;

[0076] 8. High-temperature thermostat integrated bracket; 8-1. Oil filling pipe; 8-3a. Circular through hole; 8-4. High-temperature thermostat mounting plate; 8-6. High-temperature thermostat integrated bracket base plate; 8-8. Oil filling cavity; 8-6a. Square through hole; 8-9. Screen plate; 8-10. High-temperature thermostat positioning plate; 8-11. High-temperature thermostat support plate;

[0077] 9. Engine. Detailed Implementation

[0078] The invention will now be further described with reference to the accompanying drawings.

[0079] like Figures 1 to 7 As shown, the present invention provides an external thermostat cooling circulation system for an engine, comprising a high-temperature water cooling circulation system, a low-temperature water cooling circulation system, and a control system.

[0080] Referring to Figure 1, the high-temperature water cooling circulation system in this embodiment includes a first water chamber, a second water chamber, and a water-heated air heater. The outlet of the second water chamber is connected to the second water chamber outlet pipe H1. From the inlet to the outlet, the second water chamber outlet pipe H1 is sequentially connected to a high-temperature water flow meter P1, a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, and a high-temperature compensation pipe H7. The main valve of the high-temperature water thermostat U1 is connected to the first water chamber return pipe H6. The high-temperature water thermostat U1 is connected to the first water chamber. Its auxiliary valve is connected to the inlet of the high-temperature water preheater Y1 and the high-temperature water pump R1 via a small circulation return water pipe H9. The outlet of the high-temperature water preheater Y1 is connected to the inlet of the oil cooler S2 via a pipe. The outlet of the first water chamber is connected to the outlet pipe H1 of the second water chamber via a high-temperature compensation pipe H7. Specifically, one end of the high-temperature compensation pipe H7 is connected to the outlet pipe H1 of the second water chamber between the first water chamber and the high-temperature water flow meter P1, and the other end is connected to the outlet of the first water chamber. A displacement sensor C2 is also installed on the high-temperature water thermostat U1. The displacement sensor C2, the high-temperature water preheater Y1, the water temperature sensor C1, the displacement sensor C4, the water temperature sensor C3, and the low-temperature water preheater Y2 are electrically connected to the control system via a control circuit. In this embodiment, the high-temperature water thermostat U1 is installed on one of the rows of the engine 9. (Refer to...) Figure 3 As shown.

[0081] Specifically, in this embodiment, the high-temperature thermostat U1 is mounted on one of the rows of the engine 9 via the high-temperature thermostat integrated bracket 8; furthermore, in order to improve the stability of the high-temperature thermostat U1, the high-temperature thermostat U1 is mounted on the high-temperature thermostat integrated bracket 8 via rubber damping blocks 3.

[0082] refer to Figure 4 , Figure 5 As shown, the high-temperature thermostat integrated bracket 8 in this embodiment includes an oil filling pipe 8-1, an oil filling tank 8-8, a high-temperature thermostat mounting assembly, a high-temperature thermostat integrated bracket base plate 8-6, a high-temperature thermostat positioning plate 8-10, and a high-temperature thermostat support plate 8-11. The oil filling pipe 8-1 is installed on the oil filling tank 8-8 and is connected to the oil filling tank 8-8. A sieve plate 8-9 is installed at the inlet of the oil filling tank 8-8 to filter impurities in the oil, thereby improving the purity of the oil entering the oil filling tank 8-8. The high-temperature thermostat integrated bracket base plate 8-6 has a square through hole 8-6a. The oil filling tank 8-8 and the high-temperature thermostat mounting assembly are both welded to the high-temperature thermostat integrated bracket base plate 8-6. The bottom of the oil filling tank 8-8 is hollow. The high-temperature thermostat integrated bracket base plate 8-6 has a square through hole 8-6a. The bottom of the oil filling tank 8-8 is installed on the high-temperature thermostat integrated bracket base plate 8-6 and covers the square through hole 8-6a. The square through hole 8-6a, the oil filling pipe 8-1, and the oil filling tank 8-8 together form an oil filling and transport channel. The oil filling tank 8-8 has a circular through hole 8-3a for installing the oil filter 7. The high-temperature thermostat mounting assembly includes a high-temperature thermostat mounting plate 8-4, a high-temperature thermostat mounting plate 8-5, and a high-temperature thermostat mounting assembly. The high-temperature water thermostat positioning plate 8-10 and the high-temperature water thermostat support plate 8-11 are welded together and then fixedly installed on the high-temperature water thermostat integrated bracket base plate 8-6. The high-temperature water thermostat support plate 8-11 is inclined relative to the high-temperature water thermostat integrated bracket base plate 8-6. The high-temperature water thermostat mounting plate 8-4 is welded to the top of the side plate of the high-temperature water thermostat support plate 8-11 and also to the high-temperature water thermostat positioning plate 8-10. The high-temperature water thermostat mounting plate 8-4 is opposite and parallel to the surface of the circular through hole 8-3a of the oil filler tank 8-8. The high-temperature water thermostat integrated bracket base plate 8-6 is fixed on one row of the engine 9. (Refer to...) Figure 3 As shown. The high-temperature water thermostat U1 is installed on the high-temperature water thermostat mounting plate 8-4.

[0083] Furthermore, the high-temperature water cooling circulation system of this embodiment also includes a high-temperature drain pipe H8. The inlet of the high-temperature drain pipe H8 is connected to the outlet pipe H1 of the second water chamber and is close to the inlet of the high-temperature water pump R1. Specifically, the inlet of the high-temperature drain pipe H8 is connected to the outlet pipe H1 of the second water chamber between the high-temperature water flow meter P1 and the high-temperature water pump R1, and its outlet can be connected to a collection tank. The circulating water in the outlet pipe H1 of the second water chamber is discharged into the collection tank through the high-temperature drain pipe H8 to empty the circulating water inside the outlet pipe H1 of the second water chamber. Furthermore, the high-temperature water cooling circulation system of this embodiment also includes a water-heated air heater, which is connected to the high-temperature drain pipe H8 through the outlet pipe H10 of the water-heated air heater.

[0084] In this embodiment, displacement sensor C2 is installed on the high-temperature water thermostat U1 as a redundant design for the high-temperature water thermostat U5. It detects the displacement of the valve opening of the high-temperature water thermostat U1 and transmits the collected displacement information to the control system, thereby enabling the control system to monitor the high-temperature water thermostat U1. The high-temperature water vent pipe H5 is used to expel air bubbles from the second water chamber outlet pipe H1, solving the technical problem of reduced efficiency in cooling water absorbing heat from the engine 9, damage to the high-temperature water pump R1, or even serious engine 9 malfunctions caused by air bubble generation. The high-temperature water flow meter P1 detects the flow rate entering the diesel engine water supply pipe Q and transmits the collected flow signal to the control system for real-time monitoring. The water-heated heater outlet pipe H10 facilitates the external interface of the engine 9. The water temperature sensor C1 detects the temperature of the circulating water in the second water chamber outlet pipe H1 and sends the collected temperature information to the control system in real time. The control system processes the received information and displays the real-time temperature information. If the received temperature is too high, an alarm module is triggered.

[0085] refer to Figure 2As shown, the cryogenic water cooling circulation system in this embodiment includes a third water chamber, a fourth water chamber, and a cooling fan F. The outlet of the fourth water chamber is connected to the fourth water chamber outlet pipe A1. From the inlet to the outlet, the fourth water chamber outlet pipe A1 is sequentially connected to a cryogenic water pump R2, an air cooler S2, a diesel engine water supply pipe Q, a water temperature sensor C3, and a cryogenic water thermostat U2. The cryogenic water thermostat U2 is equipped with a displacement sensor C4. The main valve of the cryogenic water thermostat U2 is connected to the third water chamber through the third water chamber return pipe A4. The third water chamber return pipe A4 is connected to... A cryogenic water flow meter P2 is provided. The auxiliary valve of the cryogenic water thermostat U2 is connected to the inlet of the cryogenic water pump R2 via a cryogenic small circulation pipe A6. A low-temperature water preheater Y2 is connected to the outlet pipe A1 of the fourth water chamber between the air cooler S2 and the water temperature sensor C3. The air cooler S2 is connected to the interior of the third water chamber via a cryogenic water vent pipe A8. A cryogenic water drain pipe A7 is connected to the outlet pipe A1 of the fourth water chamber between the fourth water chamber and the cryogenic water pump R2. This cryogenic water drain pipe A7 is used to drain the circulating water in the outlet pipe A1 of the fourth water chamber. The third water chamber is connected to the inlet of the cryogenic water pump R2 via a cryogenic water compensation pipe A5 to provide circulating water compensation for the engine 9. The cooling fan F is installed on one side of the low-temperature heat dissipation unit to quickly dissipate the cooling water circulating in the third and fourth water chambers of the low-temperature heat dissipation unit; the low-temperature water thermostat U2 is installed on the other side of the engine 9; in this embodiment, the water temperature sensor C3, the displacement sensor C4, and the low water temperature preheater Y2 are all electrically connected to the control system through the control circuit.

[0086] Specifically, the low-temperature water thermostat U2 is mounted on another row of the engine 9 via the low-temperature water thermostat integrated bracket 4. Furthermore, the low-temperature water thermostat U2 is mounted on the low-temperature water thermostat integrated bracket 4 via the rubber damping block 3.

[0087] refer to Figure 6 , Figure 7As shown, the cryogenic thermostat integrated bracket 4 in this embodiment includes a cryogenic thermostat support plate 4-1, a cryogenic thermostat mounting plate 4-3, a fuel filter mounting plate 4-4, a cryogenic thermostat fixing plate 4-6, a fuel leakage mounting hole 4-8, and a cryogenic thermostat support positioning plate 4-9. The upper and lower sides of the cryogenic thermostat support plate 4-1 are welded to the left sides of the cryogenic thermostat mounting plate 4-3 and the cryogenic thermostat fixing plate 4-6, respectively. The cryogenic thermostat support plate 4-1 is inclined and is connected to the cryogenic thermostat fixing plate. The included angle of 4-6 is greater than or equal to 120°. The upper, left and lower sides of the low-temperature water thermostat support positioning plate 4-9 are welded together with the low-temperature water thermostat mounting plate 4-3, the low-temperature water thermostat support plate 4-1 and the low-temperature water thermostat fixing plate 4-6 to form a whole. The fuel filter mounting plate 4-4 is welded to the upper right side of the low-temperature water thermostat support positioning plate 4-9. The upper side of the fuel filter mounting plate 4-4 is welded together with the low-temperature water thermostat mounting plate 4-3. The fuel filter mounting plate 4-4 is used to install the fuel filter 1. The low-temperature thermostat mounting plate 4-6 is installed on another row of the V-type engine 9; the low-temperature thermostat support positioning plate 4-9 has a fuel leak mounting hole 4-8 for installing the fuel leak sensor 10; the low-temperature thermostat U2 is fixedly installed on the low-temperature thermostat mounting plate 4-3. Furthermore, the low-temperature thermostat U2 is installed on the low-temperature thermostat mounting plate 4-3 through a rubber shock absorber 3 to reduce the vibration frequency of the low-temperature thermostat U2 and ensure the stability of the low-temperature thermostat U2.

[0088] In this embodiment, the clutch of the cooling fan F can automatically adjust the speed of the cooling fan F according to the high / low temperature of the water collected by the control system. The water temperature sensor C3 is used to collect the temperature of the circulating water in the fourth water chamber outlet pipe A1 and transmit it to the control system. The control system processes the received information and displays the real-time temperature information. If the received temperature is too low, an alarm module is triggered. The displacement sensor C4 is installed on the low-temperature water thermostat U2 as a redundant design for U2. It is used to detect the displacement of the valve opening of the low-temperature water thermostat U2, and then monitors the low-temperature water thermostat U2 through comparison by the control system. The low-temperature water preheater Y2 is used to preheat the circulating water in the pipes to ensure that the cooling water entering the low-temperature water thermostat U2 is within the optimal water temperature range to protect the engine 9. The low-temperature water vent pipe A8 is used to remove air bubbles from the air cooler. The low-temperature drain pipe A7 is used to drain the internal cooling water of the engine 9 when it is not suitable for transportation, storage, or other purposes.

[0089] In this embodiment, the control system can be a host computer installed on the central control panel in the driver's cab or control room. The alarm module in this embodiment can consist of a buzzer and a warning light. The control system can drive the buzzer of the alarm module to emit an alarm sound and simultaneously illuminate the warning light. Upon receiving the alarm signal, personnel can promptly handle the situation to prevent damage to the engine 9 due to excessively high or low temperatures.

[0090] refer to Figure 1 , Figure 2 As shown, in this embodiment, the first and third water chambers are integrated with an expansion tank. The expansion tank is equipped with a low-level sensor, which is electrically connected to the control system via a control circuit. Specifically, in this embodiment, the expansion tank is used to provide additional compensating circulating water to the engine 9; the low-level sensor is used to collect the water level in the expansion tank and transmit the collected information to the control system. The control system processes the received information, and if the water level in the expansion tank is low, the control system triggers an alarm module to remind the operator to add water to the expansion tank in a timely manner.

[0091] It should be noted that, Figure 1 and Figure 2 The diesel engine water supply line Q and the engine are the same component.

[0092] refer to Figure 8 As shown, the control method for the external thermostat cooling circulation system of the engine described above is as follows:

[0093] The S1 vehicle is equipped with a temperature sensor that transmits the collected ambient temperature to the control system. The control system includes a display in the vehicle's control room that shows the ambient temperature. The staff can see the ambient temperature information on the display. This technology is existing technology and will not be described in detail.

[0094] Before starting the engine, check if the ambient temperature is below 5°C.

[0095] If so, proceed to step S2;

[0096] If not, start engine 9 directly;

[0097] S2 determines whether the water temperature sensor is operating successfully:

[0098] If so, the high-temperature water preheater Y1 and the low-temperature water preheater Y2 are started manually or automatically. The cooling circulating water is preheated by the high-temperature water preheater Y1 and the low-temperature water preheater Y2, and then flows into the diesel engine water supply pipe Q to preheat the engine 9, and proceeds to step S3.

[0099] If not, the control system will alarm, the staff will inspect the water temperature sensor, and then return to step S1;

[0100] S3 determines whether the high-temperature water temperature reaches 70-80℃ and the low-temperature water temperature reaches 27-37℃. Let the circulating water temperature after passing through the high-temperature water thermostat be H1 and the circulating water temperature after passing through the low-temperature water thermostat be A1.

[0101] If H1 < 70℃, the secondary valve of the high-temperature water thermostat U1 will open, and the engine 9 will preheat the engine 9 through the high-temperature water small circulation system.

[0102] If 70℃≤H1≤80℃, the main valve of the high-temperature water thermostat U1 will open, and the engine will enter the high-temperature water circulation system to cool down the engine.

[0103] If H1 > 80℃, it indicates that the high-temperature water temperature is too high, triggering an alarm in the control system, and staff will inspect the pipeline.

[0104] If H2 < 27℃, the auxiliary valve of the low-temperature water thermostat U2 will open, and the engine 9 will enter the low-temperature water small circulation system to preheat the engine 9;

[0105] If 27℃≤H2≤37℃, the main valve of the low-temperature water thermostat U2 will open, and the engine 9 will enter the low-temperature water large circulation system to cool down the engine 9.

[0106] If H2 > 37℃, it indicates that the low-temperature water temperature is too high, triggering an alarm in the control system, and personnel will inspect and repair the pipeline.

[0107] Specifically, the working principle of the high-temperature water cooling circulation system is as follows:

[0108] The flow meter P1, high-temperature water pump R1, oil cooler S1, diesel engine water supply pipe Q, water temperature sensor C1, high-temperature water thermostat U1, displacement sensor C2, upper water chamber return pipe H6, and high-temperature compensation pipe H7 on the second water chamber outlet pipe H1 of the high-temperature heat dissipation unit constitute the high-temperature water large circulation system; the flow meter P1, high-temperature water pump R1, oil cooler S1, diesel engine water supply pipe Q, water temperature sensor C1, high-temperature water thermostat U1, displacement sensor C2, high-temperature water preheater Y1, and high-temperature water small circulation return pipe H9 on the second water chamber outlet pipe H1 constitute the high-temperature water small circulation system.

[0109] The control system starts the high-temperature water pump R1. Under the action of the high-temperature water pump R1, the cooling circulating water in the second water chamber enters the outlet pipe H1 of the second water chamber. When the room temperature of the cooling circulating water entering the high-temperature water thermostat U1 is less than 70°C, the cooling circulating water enters the small circulation system. That is, the cooling circulating water enters the diesel engine water supply pipe Q through the auxiliary valve of the high-temperature water thermostat U1, the small circulation return pipe H9, the high-temperature water preheater Y1, and the oil cooler S1 to preheat the engine 9. Then it flows into the high-temperature water thermostat U1, and so on, to achieve the purpose of preheating the engine 9. A high-temperature water preheater Y1 is connected to the pipeline to preheat the cooling circulating water in the pipeline. When the water temperature in the pipeline is lower than the set lower limit N1, the control system controls the high-temperature water preheater Y1 to work and heat the water in the pipeline. When the water temperature in the pipeline is higher than the set upper limit N2, the control system controls the high-temperature water preheater Y1 to stop working, so as to ensure that the circulating water entering the diesel engine water supply pipe Q is within the optimal water temperature range required for starting the engine 9, thereby protecting the engine 9 and extending its service life. In this embodiment, the values ​​of N1 and N2 can be set according to specific circumstances and actual needs.

[0110] When the temperature of the cooling water entering the high-temperature thermostat U1 is 70℃≤H1≤80℃, the control system stops the high-temperature water preheater Y1. Simultaneously, the cooling water enters the large circulation system. Specifically, the cooling water flows through the main valve of the high-temperature thermostat U1 and the upper water chamber return pipe H6 into the first water chamber of the high-temperature heat dissipation unit for cooling. The cooled cooling water then flows through the high-temperature compensation pipe H7 into the second water chamber outlet pipe H1, and then sequentially through the high-temperature water flow meter P1, the high-temperature water pump R1, and the oil cooler S1 into the diesel engine water supply pipe Q to cool the engine 9. It then flows back to the main valve of the high-temperature thermostat U1 and into the first water chamber return pipe H6, repeating this cycle to cool the engine 9. During the cooling water circulation in the large circulation system, air bubbles in the circulating water are discharged into the first water chamber through the high-temperature water vent pipe H5. This solves the technical problem of reduced efficiency in absorbing heat from the engine 9 due to air bubble generation, which could lead to water pump damage or even serious engine 9 malfunctions. Meanwhile, the water temperature sensor C1 collects the temperature of the cooling water in the pipeline in real time and transmits the collected temperature information to the control system. The control system processes the received information and displays the real-time temperature information on the display. If the received temperature is too high, i.e. higher than 80°C, the alarm module is triggered so that the staff can receive the alarm signal and deal with it in time to avoid damage to the engine 9 due to overheating.

[0111] The working principle of the low-temperature water cooling circulation system is as follows:

[0112] The low-temperature heat dissipation unit consists of the fourth water chamber outlet pipe A1, low-temperature water pump R2, air cooler S2, low-temperature water preheater Y2, water temperature sensor C3, low-temperature water thermostat U2, displacement sensor C4, the third water chamber return pipe A4, low-temperature water flow meter P2, and low-temperature compensation pipe A5, which together form a large low-temperature water circulation system. The fourth water chamber outlet pipe A1, low-temperature water pump R2, air cooler S2, low-temperature water preheater Y2, water temperature sensor C3, low-temperature water thermostat U2, displacement sensor C4, and low-temperature water small circulation pipe A6, which together form a small low-temperature water circulation system.

[0113] The control system starts the low-temperature water pump R1. Under the action of the high-temperature water pump R1, the cooling circulating water in the fourth water chamber enters the outlet pipe A1 of the fourth water chamber, flows out through the air cooler S2, and then enters the diesel engine water supply pipe Q. Then, it enters the low-temperature water thermostat U2 through the diesel engine water supply pipe Q. When the temperature H2 of the cooling circulating water entering the low-temperature water thermostat U2 is less than 27°C, the cooling circulating water enters the small circulation system. That is, the cooling circulating water enters the diesel engine water supply pipe Q through the auxiliary valve of the low-temperature water thermostat U2, the low-temperature small circulation pipe A6, the low-temperature water pump R2, and the air cooler S2 to preheat the engine 9. Then, it flows back to the low-temperature water thermostat U2, and this cycle is repeated to achieve the purpose of preheating the engine 9. During low-temperature water circulation, when the water temperature in the pipeline is below the set lower limit N3, the control system activates the low-temperature water preheater Y2 to heat the water in the pipeline. When the water temperature in the pipeline is above the set upper limit N4, the control system stops the low-temperature water preheater Y2 to ensure that the circulating water entering the diesel engine's water supply pipe Q is within the optimal temperature range required for starting the engine 9, thus protecting the engine 9 and extending its service life. In this embodiment, the low-temperature water preheater Y2 is similar to an immersion heater, directly inserted into the pipeline to preheat the cooling circulating water. The values ​​of N3 and N4 in this embodiment can be set according to specific circumstances and actual needs.

[0114] When the temperature of the cooling water entering the low-temperature thermostat U2 is 27℃≤H1≤37℃, the cooling water enters the large circulation system. Specifically, the cooling water flows through the main valve of the low-temperature thermostat U2, the return water pipe A4 of the third water chamber, and the low-temperature water flow meter P2 into the third water chamber of the high-temperature heat dissipation unit for cooling. The cooled cooling water then flows through the low-temperature compensation pipe A5 into the outlet water pipe A1 of the fourth water chamber, and then sequentially through the low-temperature water pump R2 and the air cooler S2 into the diesel engine water supply pipe Q to cool the engine 9. It then flows back to the main valve of the low-temperature thermostat U2 and into the return water pipe A4 of the third water chamber, repeating this cycle to cool the engine 9. During the circulation of the cooling water in the large circulation system, air bubbles in the water are discharged into the third water chamber through the air cooler S2 and the low-temperature water vent pipe A8. This solves the technical problem of reduced efficiency in absorbing engine heat due to air bubble generation, which could lead to water pump damage or even serious engine failure. Meanwhile, the water temperature sensor C2 collects the temperature of the cooling water circulating in the pipeline in real time and transmits the collected temperature information to the control system. The control system processes the received information and displays the real-time temperature information on the display. If the received temperature information is too high, i.e. higher than 37°C, the alarm module is triggered so that the staff can receive the alarm signal and deal with it in time to avoid damage to the engine due to excessively high or low temperature.

[0115] The high-temperature water thermostat U1 and the low-temperature water thermostat U2 of this invention control the opening and closing of the main valve and the auxiliary valve of the thermostat according to the temperature of the cooling circulating water, thereby controlling whether the cooling circulating water flows through the large circulation system or the small circulation system, so as to achieve the purpose of cooling the engine 9.

[0116] During the circulation process, when the water temperature in the high-temperature cooling system exceeds 70°C, or the water temperature in the low-temperature cooling system exceeds 27°C, the control system will control the cooling fan F to work to accelerate the cooling rate of the water in the pipeline. When the cooling circulating water temperature is too high and exceeds the cooling water critical value, the coolant in the first and third water chambers expands and enters the expansion tank. When the cooling circulating water temperature is lower than the cooling critical value, it flows back to the first and third water chambers under the action of atmospheric pressure. This principle is existing technology and will not be elaborated here.

[0117] refer to Figure 8 , Figure 9 As shown, the method for determining the damage of the high / low temperature water thermostat based on the above cooling system includes the following steps:

[0118] After the S1 engine ran for 5 minutes, an infrared thermometer was used to measure whether the pipes in the high-temperature water cooling system were above 45°C and whether the pipes in the low-temperature water cooling circulation system were below 5°C.

[0119] If so, proceed to step S2;

[0120] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged;

[0121] If the pipe temperatures in the high-temperature water and low-temperature water cooling systems are the same, then the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

[0122] When the engine coolant temperature is above 80°C, S2 determines whether the high-temperature water cooling system is above 80°C and whether the pipes in the low-temperature water cooling system are above 37°C.

[0123] If so, then engine 9 will operate normally;

[0124] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

[0125] refer to Figure 10 As shown, another method for determining thermostat damage based on the above cooling system is as follows:

[0126] S1 starts the engine 9;

[0127] S2 uses an infrared thermometer to measure the temperature of the outer casings of the high-temperature water thermostat U1 and the low-temperature water thermostat U2.

[0128] The S3 infrared thermometer displays whether the inlet temperature of the high-temperature thermostat U1 and the low-temperature thermostat U2 has risen to 70℃ (this value varies depending on the engine; it can be set according to the actual situation):

[0129] If so, proceed to step S4;

[0130] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged;

[0131] S4 determines whether the temperature at the engine 9 outlet has increased compared to the temperature in the previous 5 seconds.

[0132] If so, then the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are normal;

[0133] If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

[0134] The method for determining the failure of the high / low temperature water thermostat based on the above-mentioned cooling system is as follows:

[0135] Engine 9 exhibits knocking noise, power reduction, and the temperature of the high-temperature cooling unit is below 45°C. The belt of the cooling fan F is not slipping, and the blades of the cooling fan F are rotating normally. At this time, the large circulation of the high-temperature water cooling system and the low-temperature water cooling system is blocked or obstructed. This indicates that the main valves of the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are closed, but the auxiliary valves are normally open. In other words, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 have failed, and the thermostats are determined to be damaged.

[0136] Another method for determining the failure of the high / low temperature water thermostat based on the above cooling system is as follows:

[0137] The S1 engine coolant temperature is below 5°C;

[0138] S2 determines whether it is winter;

[0139] If so, the engine is not working properly and it is not related to the thermostat. Engineers can check the engine.

[0140] If not, the thermostat failure will cause thermostat damage. In this case, the engine will run under certain operating conditions or have difficulty starting, which will lead to rough combustion, low thermal efficiency, and increased oil viscosity.

[0141] The remaining components of the engine external thermostat cooling circulation system, control method, and thermostat damage determination method according to embodiments of the present invention, such as flow meter, thermostat, control system, preheater, sensor, etc., and their operation, are known to those skilled in the art and will not be described in detail here.

[0142] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0143] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0144] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0145] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0146] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0147] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An external thermostat cooling circulation system for an engine, characterized in that, include: A high-temperature water cooling circulation system includes a first water chamber and a second water chamber of a high-temperature heat dissipation unit. The outlet of the second water chamber is connected to a second water chamber outlet pipe H1, which is sequentially connected from the inlet to the outlet to a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, and a high-temperature water thermostat U1. The main valve of the high-temperature water thermostat U1 is connected to the first water chamber via a return water pipe H6. The auxiliary valve of the high-temperature water thermostat U1 is connected to a high-temperature water preheater Y1 and the inlet of the high-temperature water pump R1 via a small circulation return water pipe H9. The outlet of the high-temperature water preheater Y1 is connected to the inlet of the oil cooler S1 via a pipe. The outlet of the first water chamber is connected to the second water chamber outlet pipe H1 via a high-temperature compensation pipe H7, with the outlet of the high-temperature compensation pipe H7 located close to the second water chamber. The high-temperature water thermostat U1 is installed on one of the rows of the engine. A low-temperature water cooling circulation system includes a third water chamber, a fourth water chamber, and a cooling fan F of a low-temperature heat dissipation unit. The outlet of the fourth water chamber is connected to a fourth water chamber outlet pipe A1. From the inlet to the outlet, the fourth water chamber outlet pipe A1 is sequentially connected to a low-temperature water pump R2, an air cooler S2, a diesel engine water supply pipe Q, a water temperature sensor C3, and a low-temperature water thermostat U2. The main valve of the low-temperature water thermostat U2 is connected to the third water chamber via a return water pipe A4. The auxiliary valve of the low-temperature water thermostat U2 is connected to the inlet of the low-temperature water pump R2 via the low-temperature small circulation pipeline A6. The low-temperature water preheater Y2 is connected to the outlet pipeline A1 of the fourth water chamber between the air cooler S2 and the water temperature sensor C3. The cooling fan F is installed on one side of the low-temperature heat dissipation unit to dissipate heat for the low-temperature heat dissipation unit. One end of the low-temperature water compensation pipe A5 is connected to the outlet of the third water chamber, and the other end is connected to the inlet of the low-temperature water pump R2. The low-temperature water thermostat U2 is installed on another row of the engine. The control system is electrically connected to the clutches of the high-temperature water preheater Y1, water temperature sensor C1, water temperature sensor C3, low-temperature water preheater Y2, and cooling fan F through control circuits.

2. The engine external thermostat cooling circulation system according to claim 1, characterized in that, The high-temperature water cooling circulation system also includes a high-temperature water discharge pipe H8 and a water-heated air heater. The inlet of the high-temperature water discharge pipe H8 is connected to the outlet pipe H1 of the second water chamber and is close to the inlet of the high-temperature water pump R1. The water-heated air heater is connected to the high-temperature water discharge pipe H8 through the outlet pipe H10 of the water-heated air heater. The low-temperature water cooling circulation system also includes a low-temperature water discharge pipe A7, the inlet of which is connected to the outlet pipe A1 of the fourth water chamber and is close to the inlet of the low-temperature water pump R2.

3. The engine external thermostat cooling circulation system according to claim 1, characterized in that, A high-temperature water flow meter P1 is connected to the outlet pipe H1 of the second water chamber between the second water chamber and the high-temperature water pump R1; a low-temperature water flow meter P2 is connected to the return pipe A4 of the third water chamber. The high-temperature water flow meter P1 and the low-temperature water flow meter P2 are respectively connected to the control system through a control circuit.

4. The engine external thermostat cooling circulation system according to claim 1, characterized in that, The high-temperature water thermostat U1 is equipped with a displacement sensor C2, and the low-temperature water thermostat U2 is equipped with a displacement sensor C4. The displacement sensors C2 and C4 are respectively connected to the control system through a control circuit. Furthermore, both the first and third water chambers are integrated with expansion tanks, and the expansion tanks are equipped with level sensors, which are electrically connected to the control system.

5. The engine external thermostat cooling circulation system according to claim 4, characterized in that, The high-temperature water cooling circulation system also includes a high-temperature water vent pipe H5. The air inlet of the high-temperature water vent pipe H5 is connected to the return water pipe H6 of the first water chamber and is close to the displacement sensor C2. Its air outlet is connected to the first water chamber. The low-temperature water cooling circulation system also includes a low-temperature water vent pipe A8, and the air cooler S2 is connected to the interior of the third water chamber via the low-temperature water vent pipe A8.

6. The engine external thermostat cooling circulation system according to claim 1, characterized in that, The high-temperature thermostat U1 is mounted on the engine via a high-temperature thermostat integrated bracket, and the low-temperature thermostat U2 is mounted on the engine via a low-temperature thermostat integrated bracket. Furthermore, the high-temperature water thermostat U1 is mounted on the high-temperature water thermostat integrated bracket via shock-absorbing rubber, and the low-temperature water thermostat U2 is mounted on the low-temperature water thermostat integrated bracket via shock-absorbing rubber.

7. A control method for an engine external thermostat cooling circulation system as described in any one of claims 1-6, characterized in that, Includes the following steps: Before starting the engine, S1 checks if the ambient temperature is below X ℃: If so, proceed to step S2; If not, start the engine directly; S2 checks if the water temperature sensor is functioning successfully: If so, the high-temperature water preheater Y1 and the low-temperature water preheater Y2 are started manually or automatically. The cooling circulating water is preheated by the high-temperature water preheater Y1 and the low-temperature water preheater Y2, and then flows into the diesel engine water supply pipe Q to preheat the engine, and then proceeds to step S3. If not, the control system will be triggered to alarm, the staff will inspect the water temperature sensor, and then return to step S1; S3 Let the temperature of the circulating water passing through the high-temperature water thermostat U1 be H1, and the temperature of the circulating water passing through the low-temperature water thermostat U2 be H2. If H1 < 70℃, the secondary valve of the high-temperature water thermostat U1 will open, and the engine will preheat the engine through the high-temperature water small circulation system. If 70℃≤H1≤80℃, the main valve of the high-temperature water thermostat U1 will open, and the engine will enter the high-temperature water circulation system to cool the engine. If H1 > 80℃, it indicates that the temperature of the high-temperature water is too high, and the control system will sound an alarm. If H2 < 27℃, the auxiliary valve of the low-temperature water thermostat U2 will open, and the engine will enter the low-temperature water small circulation system to preheat the engine. If 27℃≤H2≤37℃, the main valve of the low-temperature water thermostat U2 will open, and the engine will enter the low-temperature water large circulation system to cool the engine. If H2 > 37℃, it indicates that the temperature of the low-temperature water is too high, and the control system will sound an alarm.

8. The control method for an external engine thermostat cooling circulation system according to claim 7, characterized in that, The high-temperature water large circulation system includes a flow meter P1 on the outlet pipe H1 of the second water chamber of the high-temperature heat dissipation unit, a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, a displacement sensor C2, an upper water chamber return pipe H6, and a high-temperature compensation pipe H7; the high-temperature water small circulation system includes a flow meter P1 on the outlet pipe H1 of the second water chamber, a high-temperature water pump R1, an oil cooler S1, a diesel engine water supply pipe Q, a water temperature sensor C1, a high-temperature water thermostat U1, a displacement sensor C2, a high-temperature water preheater Y1, and a high-temperature water small circulation return pipe H9; The low-temperature water large circulation system includes the fourth water chamber outlet pipe A1 of the low-temperature heat dissipation unit, the low-temperature water pump R2, the air cooler S2, the low-temperature water preheater Y2, the water temperature sensor C3, the low-temperature water thermostat U2, the displacement sensor C4, the third water chamber return pipe A4, the low-temperature water flow meter P2, and the low-temperature compensation pipe A5; the low-temperature water small circulation system includes the fourth water chamber outlet pipe A1, the low-temperature water pump R2, the air cooler S2, the low-temperature water preheater Y2, the water temperature sensor C3, the low-temperature water thermostat U2, the displacement sensor C4, and the low-temperature water small circulation pipe A6.

9. A method for determining thermostat damage in an engine external thermostat cooling circulation system as described in any one of claims 1-6, characterized in that, Includes the following steps: After the S1 engine has been running for T min, use an infrared thermometer to measure whether the pipes in the high-temperature water cooling circulation system are higher than M ℃ and whether the pipes in the low-temperature water cooling circulation system are lower than N ℃. If so, proceed to step S2; If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged; S2 When the engine coolant temperature is above 80°C, determine whether the high-temperature water cooling system is above 80°C and whether the pipes in the low-temperature water cooling system are above 37°C: If so, the engine will operate normally; If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

10. A method for determining thermostat damage in an engine external thermostat cooling circulation system as described in any one of claims 1-6, characterized in that, Includes the following steps: S1 Start the engine; S2 uses an infrared thermometer to measure the temperature of the outer casings of the high-temperature water thermostat U1 and the low-temperature water thermostat U2. The S3 infrared thermometer displays whether the inlet temperature of the high-temperature thermostat U1 and the low-temperature thermostat U2 has risen to 70℃. If so, proceed to step S4; If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are damaged; S4 determines whether the engine coolant outlet temperature has increased compared to the temperature of the previous Y seconds: If so, then the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are normal; If not, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 will be damaged.

11. A method for determining thermostat damage in an engine external thermostat cooling circulation system as described in any one of claims 1-6, characterized in that, Includes the following steps: The engine makes a knocking sound, power decreases, the high-temperature cooling unit is below W ℃, and the belt of the cooling fan F is not slipping, and the fan blades of the cooling fan F are rotating normally. At this time, the large circulation of the high-temperature water cooling circulation system and the low-temperature water cooling circulation system is blocked or obstructed. This indicates that the main valves of the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are closed, but the auxiliary valves are open. That is, the high-temperature water thermostat U1 and the low-temperature water thermostat U2 are malfunctioning, and the thermostats are determined to be damaged.

12. A method for determining thermostat damage in an engine external thermostat cooling circulation system as described in any one of claims 1-6, characterized in that, Includes the following steps: The S1 engine coolant temperature is below H ℃; S2 determines whether it is winter; If so, the engine will not function properly; If not, the thermostat failure will lead to thermostat damage.

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