A working method of a cooling system adapted to rapid engine warm-up

Abstract

The present invention discloses a cooling system and operating method suitable for rapid engine warm-up. The system comprises a water pump, an engine water jacket, and an expansion water tank. The water outlet of the water pump is connected to the water inlet of the engine water jacket. The water outlet of the engine water jacket is connected in series with a thermostat I. The water outlet of the thermostat I is connected to the water inlet of the water pump on one side and to the water inlet of the water pump on the other side, passing through a radiator water tank and thermostat II in series. The first and second inlets of the expansion water tank are connected to the water inlet of the engine water jacket and the radiator water tank, respectively. The outlet of the expansion water tank is connected to the water inlet of the water pump. The present invention can accelerate engine warm-up in low temperatures, particularly in extremely cold conditions, rapidly raising the water temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, in particular to a cooling system and a working method suitable for rapid engine warm-up. Background Art

[0002] Engine warm-up refers to the process of raising the engine cylinder temperature from a low temperature to normal operating temperature. During a cold start, if the water temperature in the water cooling system is low, the engine will have difficulty quickly reaching the temperature required for full fuel combustion. This will hinder fuel evaporation and lead to poor combustion. This will result in unnecessary fuel consumption and waste, as well as the production of hydrocarbons that pollute the environment. Therefore, during cold starts, it is necessary to raise and maintain the water temperature in the water cooling system.

[0003] In the prior art, commercial vehicle engine thermostats are typically located at the water outlet, while passenger vehicle thermostats are located at the water pump inlet. Both utilize a single valve to control either the inlet or outlet temperature. During rapid cold acceleration, due to large pressure fluctuations, the engine's degassing outlet forces some water and air into the expansion tank. This pressure drop rapidly draws in cold water from the adjacent radiator tank. Consequently, during rapid cold acceleration, the radiator tank's cooling water effectively participates in the engine warm-up process, resulting in a slow temperature rise in low-temperature environments. Summary of the Invention

[0004] In view of the above-mentioned existing defects, the purpose of the present invention is to provide a cooling system and working method suitable for rapid engine warm-up, which can accelerate the warm-up in low temperature, especially extremely cold conditions, so that the water temperature rises rapidly.

[0005] The technical solutions of the present invention are as follows:

[0006] A cooling system adapted for rapid engine warm-up comprises a water pump, an engine water jacket, and an expansion water tank. The water outlet of the water pump is connected to the water inlet of the engine water jacket. The water outlet of the engine water jacket is connected in series with a thermostat I. One path of the water outlet of the thermostat I is connected to the water inlet of the water pump, and the other path passes through a radiator water tank and thermostat II connected in series and is connected to the water inlet of the water pump; the inlet of the expansion water tank is connected to the water outlet of the engine water jacket, and one path of the outlet of the expansion water tank is connected to the water inlet of the radiator water tank, and the other path is connected to the water inlet of the water pump.

[0007] Specifically, in the low-temperature stage of the engine, the thermostat II is closed; in the high-temperature stage of the engine, the thermostat II is opened.

[0008] Specifically, the opening temperature range of the thermostat II is 60-80°C.

[0009] Specifically, the water outlet of the thermostat I and the water outlet of the thermostat II are connected to the water inlet of the water pump through a tee.

[0010] Specifically, the outlet of the expansion water tank is located upstream of the connection node between the thermostat I and the water pump.

[0011] Specifically, the heat dissipation water tank is provided with a fan.

[0012] The present invention also provides a method for operating a cooling system adapted for rapid engine warm-up, comprising the following steps:

[0013] S1: When the engine is cold started, the water pump first pumps the coolant into the engine water jacket for circulation;

[0014] S2: Detect the engine water temperature. When the temperature is below 60°C, both thermostats I and II are closed, and the coolant in the engine water jacket remains in the engine water jacket.

[0015] S3: When rapid acceleration causes the water pump pressure to be too high and higher than the water pressure in the expansion tank, part of the coolant in the engine water jacket flows into the expansion tank, flows through the outlet of the expansion tank into the water pump, and is then pumped into the engine water jacket for circulation;

[0016] S4: When the temperature is between 60°C and 80°C, thermostat II opens and thermostat I closes. A portion of the coolant in the engine water jacket flows into the expansion tank, passes through the radiator, and uses the vehicle's headwind to exchange heat with the coolant in the radiator, lowering the coolant temperature. The coolant then flows through thermostat II into the water pump and is pumped back into the engine water jacket for circulation.

[0017] S5: Detect the engine water temperature. When the temperature reaches 80℃ or above, both thermostat I and thermostat II are opened. The coolant in the engine water jacket mainly passes through thermostat I, enters the water pump and is pumped into the engine water jacket for circulation, and passes through the radiator water tank. The fan starts working and provides forced heat exchange for the radiator water tank. After lowering the coolant temperature, it passes through thermostat II, enters the water pump and is pumped into the engine water jacket for circulation.

[0018] Beneficial effects of the present invention:

[0019] The present invention adds a thermostat between the radiator tank and the water pump, isolating the water inlet passages from the radiator tank and the water pump. If the thermostat is not open at low temperatures, even if the expansion tank absorbs some water during a sudden pressure increase, the coolant in the radiator tank is blocked by the thermostat. Therefore, the water in the radiator tank cannot communicate with the engine's circulating water and does not participate in the warm-up process. This accelerates warm-up in low temperatures, especially in extremely cold conditions, allowing the water temperature to rise rapidly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of Example 1 of the present invention.

[0021] In the figure, 1-water pump, 2-engine water jacket, 3-thermostat I, 4-expansion tank, 5-fan, 6-radiator tank, 7-thermostat II. DETAILED DESCRIPTION

[0022] To explain the technical content, objectives, and effects of the present invention in detail, the following embodiments are described in conjunction with the accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the embodiments and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0023] According to a specific embodiment of this solution, a cooling system adapted to rapid engine warm-up is provided. Figure 1 As shown, the cooling system includes a water pump 1, an engine water jacket 2 and an expansion water tank 4. The water outlet of the water pump 1 is connected to the water inlet of the engine water jacket 2, and the water outlet of the engine water jacket 2 is connected in series with a thermostat I3. It is characterized in that: one path of the water outlet of the thermostat I3 is connected to the water inlet of the water pump 1, and the other path is connected to the water inlet of the water pump 1 through a radiator water tank 6 and a thermostat II 7 connected in series; the inlet of the expansion water tank is connected to the water outlet of the engine water jacket, and the outlet of the expansion water tank is connected to the water inlet of the radiator water tank on one path, and to the water inlet of the water pump on the other path.

[0024] This embodiment adds a thermostat II7 between the radiator water tank 6 and the water pump 1. Specifically, thermostat II7 is located at the water inlet of the engine water jacket 2, and thermostat I3 is also located at the water outlet. During rapid acceleration at low temperatures, due to a sudden increase in pressure, the engine's degassing port pushes some water and air into the expansion tank 4. This pressure reduction then rapidly draws in coolant from the adjacent water pump 1. Since thermostat II7 is located between the radiator water tank 6 and the water pump 1, it is closed, isolating the water inlet passages from the radiator water tank 6 and the water pump 1. When thermostat II7 is closed at low temperatures, the water in the radiator water tank 6 cannot communicate with the engine's circulating water, preventing coolant from entering the radiator water tank 6. Consequently, the temperature difference at the water inlet of the engine water jacket 2 reduces the amount of heat exchanged, thereby reducing warm-up time and accelerating warm-up, thus achieving the objectives of the present invention.

[0025] As a preferred solution of this embodiment, thermostat II 7 is closed during low engine temperatures and opened during high engine temperatures. During cold engine starts, the water temperature in the water circulation system needs to be raised and maintained at a certain level. Closing thermostat II 7 isolates the water in radiator tank 6, accelerating engine warm-up. During high engine temperatures, due to rising engine heat, thermostat II 7 is opened, allowing radiator tank 6 to enter the circulating cooling system, achieving rapid cooling.

[0026] As a preferred solution of this embodiment, the opening temperature range of the thermostat II 7 is 60-80°C. Opening at 60-80°C is beneficial to reducing the fluctuation range of the engine water temperature.

[0027] As a preferred solution of this embodiment, the water outlet of the thermostat I 3 and the water outlet of the thermostat II 7 are connected to the water inlet of the water pump 1 through a tee. The connection through the tee pipe has a simple structure, low cost and convenient material acquisition.

[0028] As a preferred solution of this embodiment, the outlet of the expansion water tank 4 is located upstream of the connection node between the thermostat I3 and the water pump 1, so that the water flow is smoother when the pump pressure and the pressure difference of the expansion water tank 4 are exchanged.

[0029] As a preferred solution of this embodiment, in this embodiment, the heat dissipation water tank 6 is provided with a fan 5 to provide heat dissipation for the heat dissipation water tank 6 .

[0030] The working method of the cooling system adapted for rapid engine warm-up in the above embodiment includes the following steps:

[0031] S1: When the engine is cold started, water pump 1 first pumps the coolant into the engine water jacket 2 for circulation;

[0032] S2: Detect the engine water temperature. When the temperature is below 60°C, both thermostat I3 and thermostat II7 are closed. The coolant in the engine water jacket 2 is directly kept still in the engine water jacket 2. The cooling water is heated up quickly to achieve the warm-up effect.

[0033] S3: When rapid acceleration causes the water pressure in water pump 1 to be too high and higher than the water pressure in expansion tank 4, part of the coolant in engine water jacket 2 flows into expansion tank 4, flows through the outlet of expansion tank 4 into water pump 1, and is then pumped into engine water jacket 2 for circulation, so that the cooling system maintains rapid warm-up under reasonable pressure regulation;

[0034] S4: When the temperature is between 60°C and 80°C, thermostat II 7 opens and thermostat I 3 closes. A portion of the coolant in the engine water jacket 2 flows into the expansion tank 4, passes through the radiator 6, and uses the vehicle's headwind to exchange heat with the coolant in the radiator 6, lowering the coolant temperature. The coolant then passes through thermostat II 7 and enters the water pump 1, which then pumps it into the engine water jacket 2 for circulation. This keeps the coolant in the engine water jacket 2 at this temperature as much as possible.

[0035] S5: Detect the engine water temperature. When the temperature reaches 80℃ or above, both thermostat I3 and thermostat II7 are opened. The coolant in the engine water jacket 2 mainly passes through thermostat I3, enters the water pump 1 and is then pumped into the engine water jacket 2 for circulation, and passes through the radiator water tank 6. The fan 5 starts working and provides forced heat exchange for the radiator water tank 6. After lowering the coolant temperature, the coolant passes through thermostat II7 and enters the water pump 1 and is then pumped into the engine water jacket 2 for circulation, achieving the effect of rapid cooling of the water temperature.

[0036] Although the present invention has been described in detail above using specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made based on the present invention. Therefore, such modifications or improvements, which do not depart from the spirit of the present invention, are intended to fall within the scope of protection claimed herein.

Claims

1. A method for operating a cooling system adapted for rapid engine warm-up, comprising a water pump (1), an engine water jacket (2), and an expansion water tank (4), wherein the water outlet of the water pump (1) is connected to the water inlet of the engine water jacket (2), and the water outlet of the engine water jacket (2) is connected in series with a thermostat I (3), characterized in that: One of the water outlets of the thermostat I (3) is connected to the water inlet of the water pump (1), and the other is connected to the water inlet of the water pump (1) through the radiator water tank (6) and the thermostat II (7) connected in series. The inlet of the expansion water tank (4) is connected to the water outlet of the engine water jacket (2). One of the outlets of the expansion water tank (4) is connected to the water inlet of the radiator water tank (6), and the other is connected to the water inlet of the water pump (1). The working method comprises the following steps: S1: When the engine is cold started, the water pump (1) first pumps the coolant into the engine water jacket (2) for circulation; S2: Detect the engine water temperature. When the temperature is below 60°C, both thermostat I (3) and thermostat II (7) are closed, and the coolant in the engine water jacket (2) remains stationary in the engine water jacket (2); S3: When the water pressure of the water pump (1) is too high due to rapid acceleration and is higher than the water pressure of the expansion water tank (4), part of the coolant in the engine water jacket (2) flows into the expansion water tank (4), flows through the outlet of the expansion water tank (4) into the water pump (1), and is then pumped into the engine water jacket (2) for circulation; S4: When the temperature is between 60 and 80°C, the thermostat II (7) opens and the thermostat I (3) closes; a portion of the coolant in the engine water jacket (2) flows into the expansion tank (4), passes through the heat dissipation tank (6), and after the coolant temperature is lowered, it enters the water pump (1) through the thermostat II (7) and is then pumped into the engine water jacket (2) for circulation; S5: Detect the engine water temperature. When the temperature reaches 80°C or above, both thermostat I (3) and thermostat II (7) are opened. The coolant in the engine water jacket (2) mainly passes through thermostat I (3), enters the water pump (1) and is then pumped into the engine water jacket (2) for circulation, and passes through the radiator water tank (6) on the other hand. The fan (5) starts to work and provides forced heat exchange for the radiator water tank (6). After lowering the coolant temperature, the coolant passes through thermostat II (7) and enters the water pump (1) and is then pumped into the engine water jacket (2) for circulation.

2. The method for operating a cooling system adapted for rapid engine warm-up according to claim 1, characterized in that: The water outlet of the thermostat I (3) and the water outlet of the thermostat II (7) are connected to the water inlet of the water pump (1) through a tee.

3. The method for operating a cooling system adapted for rapid engine warm-up according to claim 1, characterized in that: The outlet of the expansion water tank (4) is located upstream of the connection node between the thermostat I (3) and the water pump (1).

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