Cooling circulation system and vehicle

Abstract

The application relates to the technical field of cooling systems, and discloses a cooling circulation system which comprises a water pump, a cylinder body water jacket, a cylinder cover water jacket, an EGR cooler, an oil cooler, a three-way valve, a hydraulic retarder and a radiator. The outlet of the water pump is in communication with the inlets of the cylinder body water jacket and the oil cooler, the outlet of the cylinder body water jacket is in communication with the inlets of the cylinder cover water jacket and the EGR cooler, the outlet of the oil cooler and the outlet of the cylinder cover water jacket are in communication with the inlets of the hydraulic retarder and the radiator through the three-way valve, the outlet of the radiator is in communication with the inlet of the water pump, and the outlet of the EGR cooler is in communication with the inlet of the water pump. The cooling circulation system has good cooling effects on various components. When the cooling liquid of the EGR cooler circulates, the cooling liquid does not pass through the radiator, thereby reducing the heat dissipation burden of the radiator and reducing the burden of the water pump. The application further discloses a vehicle provided with the cooling circulation system, and the vehicle also has the above technical effects.

Description

Technical Field

[0001] This invention relates to the field of engine cooling technology, and more specifically, to a cooling circulation system and a vehicle. Background Technology

[0002] With increasing environmental awareness, vehicle exhaust pollution has become a growing concern. EGR (Exhaust Gas Recycle) technology, which effectively reduces NOx in exhaust gases, is beginning to be applied to engines.

[0003] While EGR (Exhaust Gas Refrigerant) can reduce NOx levels in exhaust gases, it significantly increases the thermal load on the engine and the entire vehicle. The heat generated by the engine is first transferred to the coolant, which then exchanges heat with the vehicle's fans through the radiator to ensure the engine operates at a suitable temperature. Excessive engine temperature reduces the reliability and durability of engine components. With the addition of an EGR system, the heat exchanged through the EGR cooler ultimately needs to be transferred to the vehicle's radiator as well.

[0004] Currently, in conventional cooling systems, the heat generated by the engine is directly transferred to the vehicle's radiator via coolant. The coolant temperature is lowered by increasing the cooling capacity of the radiator and fan. However, the radiator and fan's cooling capacity is limited by the vehicle's space constraints. If all the coolant exchanged heat through the radiator and fan, two problems would arise: First, with the addition of an EGR cooler, the coolant passing through the EGR cooler and then the radiator accounts for 10%-20% of the total engine heat dissipation. Due to the limited cooling capacity of the radiator and fan, this heat exchange cannot achieve the desired effect, resulting in high engine coolant temperature. Second, the addition of an EGR cooler increases the liquid-side flow resistance of the radiator. Overcoming this resistance requires improving the performance of the water pump, increasing its workload.

[0005] In summary, how to effectively solve the problem of poor heat dissipation caused by high heat load after adding an EGR cooler to an engine is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a cooling circulation system and a vehicle, the structural design of which can effectively solve the problem of poor heat dissipation caused by high heat load after adding an EGR cooler to the engine.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A cooling circulation system includes a water pump, a cylinder block water jacket, a cylinder head water jacket, a radiator, and an EGR cooler; the outlet of the water pump is connected to the inlet of the cylinder block water jacket, the outlet of the cylinder block water jacket is connected to the inlet of the cylinder head water jacket and the inlet of the EGR cooler, the outlet of the cylinder head water jacket is connected to the inlet of the radiator, the outlet of the radiator is connected to the inlet of the water pump, and the outlet of the EGR cooler is connected to the inlet of the water pump.

[0009] Optionally, the cooling circulation system described above also includes a hydraulic retarder and a valve. The outlet of the cylinder head water jacket is connected to the inlet of the radiator and the inlet of the hydraulic retarder respectively through the valve. The outlet of the hydraulic retarder is connected to the inlet of the radiator. The valve is used to switch the outlet of the cylinder head water jacket to be connected to the inlet of the radiator or to the inlet of the hydraulic retarder.

[0010] Optionally, in the above cooling circulation system, the valve is a three-way valve. The first end of the three-way valve is connected to the outlet of the cylinder head water jacket, the second end of the three-way valve is connected to the inlet of the hydraulic retarder, and the third end of the three-way valve is connected to the inlet of the radiator. The three-way valve can switch the first end to be connected to the second end or the third end.

[0011] Optionally, in the above cooling circulation system, the three-way valve is an electrically controlled three-way valve.

[0012] Optionally, the cooling circulation system described above also includes a controller, which is electrically connected to the electrically controlled three-way valve and is used to control the operation of the electrically controlled three-way valve.

[0013] Optionally, in the above-mentioned cooling circulation system, the inlet of the oil cooler of the cooling circulation system is connected to the outlet of the water pump, and the outlet of the oil cooler is connected to the first end of the three-way valve.

[0014] Optionally, in the above-mentioned cooling circulation system, the water pump is an electrically controlled water pump or a mechanical water pump.

[0015] The cooling circulation system provided by this invention includes a water pump, a cylinder block water jacket, a cylinder head water jacket, a radiator, and an EGR cooler. The outlet of the water pump is connected to the inlet of the cylinder block water jacket; the outlet of the cylinder block water jacket is connected to both the inlet of the cylinder head water jacket and the inlet of the EGR cooler; the outlet of the cylinder head water jacket is connected to the inlet of the radiator; the outlet of the radiator is connected to the inlet of the water pump; and the outlet of the EGR cooler is connected to the inlet of the water pump.

[0016] The cooling circulation system provided by this invention allows coolant to flow into the engine block water jacket via a water pump. After cooling the engine block, the coolant flowing out of the cylinder block water jacket splits into two paths: one flows into the cylinder head water jacket to cool the engine cylinder head, and the other flows into the EGR cooler. This means the EGR cooler and cylinder head water jacket operate in parallel cooling circulation, resulting in relatively independent cooling cycles that improve the cooling effect on each component. Coolant flowing from the cylinder head water jacket enters the radiator and then flows into the water pump, while coolant flowing from the EGR cooler flows directly into the water pump without passing through the radiator. This parallel cooling circulation between the EGR cooler and radiator reduces the radiator's heat dissipation load, improving heat exchange efficiency, and also lessens the burden on the water pump.

[0017] To achieve the above objectives, the present invention also provides a cooling circulation system comprising any of the aforementioned vehicles. Since the aforementioned vehicles possess the aforementioned technical effects, the cooling circulation system of such vehicles should also possess the corresponding technical effects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cooling circulation system according to a specific embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the first type of coolant circulation principle;

[0021] Figure 3 This is a schematic diagram of the second type of coolant circulation principle.

[0022] The following labels are shown in the attached diagram:

[0023] Water pump 100, cylinder block water jacket 200, cylinder head water jacket 300, radiator 400, EGR cooler 500, hydraulic retarder 600, three-way valve 700, oil cooler 800, three-way valve first end A, three-way valve second end B, three-way valve third end C. Detailed Implementation

[0024] This invention discloses a cooling circulation system and vehicle to improve cooling effect and reduce the workload of water pump.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The cooling circulation system provided by this invention can be used in vehicles equipped with an EGR system. The oil cooler, cylinder block water jacket (cylinder head water jacket), and EGR cooler of this cooling circulation system are relatively independent cooling cycles, and the cooling effect of each component is good. Only the heat of the oil cooler, cylinder block water jacket, and cylinder head water jacket is directly dissipated through the radiator, so the heat dissipation capacity requirement of the radiator is not too high.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of the cooling circulation system according to a specific embodiment of the present invention.

[0028] In one embodiment, the cooling circulation system provided by the present invention includes a water pump 100, a cylinder block water jacket 200, a cylinder head water jacket 300, a radiator 400, and an EGR cooler 500. The EGR cooler 500 is a component that cools the high-temperature air-fuel mixture taken from the turbocharger into a low-temperature air-fuel mixture. The outlet of the water pump 100 is connected to the inlet of the cylinder block water jacket 200, and the outlet of the cylinder block water jacket 200 is connected to both the inlet of the cylinder head water jacket 300 and the inlet of the EGR cooler 500; that is, the cylinder head water jacket 300 and the EGR cooler 500 are connected in parallel. The outlet of the cylinder head water jacket 300 is connected to the inlet of the radiator 400, the outlet of the radiator 400 is connected to the inlet of the water pump 100, and the outlet of the EGR cooler 500 is connected to the inlet of the water pump 100. That is, the outlet of the EGR cooler 500 is directly connected to the inlet of the water pump 100 without passing through the radiator 400, meaning that the EGR cooler 500 and the radiator 400 are also connected in parallel. It can be understood that the radiator 400 can be the vehicle's radiator 400, specifically connected to the radiator 400's water tank.

[0029] The cooling circulation system provided by this invention allows coolant to flow into the engine block water jacket 200 via water pump 100. After cooling the engine block, the coolant flowing out of the cylinder block water jacket 200 splits into two paths: one flows into the cylinder head water jacket 300 to cool the engine cylinder head, and the other flows into the EGR cooler 500. This means the EGR cooler 500 and the cylinder head water jacket 300 operate in parallel cooling circulation, resulting in relatively independent cooling cycles that improve the cooling effect of each component. The coolant flowing out of the cylinder head water jacket 300 enters the radiator 400 and then flows into water pump 100. The coolant flowing out of the EGR cooler 500 flows directly into water pump 100 without passing through the radiator 400. This parallel cooling circulation system in the EGR cooler 500 reduces the heat dissipation load on the radiator 400, improving heat exchange efficiency, and also reduces the load on water pump 100.

[0030] In one embodiment, the inlet of the oil cooler 800 in the cooling circulation system is connected to the outlet of the water pump 100, and the outlet of the oil cooler 800 is connected to the inlet of the radiator 400. The oil cooler 800, cylinder block water jacket 200, and cylinder head water jacket 300 adopt a parallel cooling circulation. The coolant flowing out of the water pump 100 is divided into two paths: the first path flows from the water pump 100 into the oil cooler 800; the second path flows from the water pump 100 into the cylinder block water jacket 200. In this embodiment, the EGR cooler 500 and the oil cooler 800 are also connected in parallel for cooling. Compared to traditional cooling systems, where heat is sequentially transferred from the oil cooler to the cylinder block water jacket, cylinder head water jacket, EGR cooler, and hydraulic retarder, the coolant temperature has already increased after passing through the oil cooler and cylinder block water jacket (cylinder head water jacket). Using this portion of coolant to cool the EGR cooler results in poor cooling performance. In this application, however, a relatively independent cooling circulation ensures better cooling performance for each component.

[0031] In one embodiment, the cooling circulation system includes a hydraulic retarder 600. The hydraulic retarder 600 absorbs energy through the damping motion of its internal oil. Its use as an auxiliary brake in vehicles is becoming increasingly widespread. The purpose of employing the hydraulic retarder 600 is to mitigate brake failure due to high temperatures during continuous brake pad operation. The hydraulic retarder 600 is typically connected in series in the cooling system. Regardless of whether it is operating, coolant must pass through the flow channels of the hydraulic retarder 600. The hydraulic retarder 600 has a high coolant flow requirement and its own flow resistance is also high, thus increasing the performance requirements of the water pump 100 and increasing engine fuel consumption. In this application, the outlet of the cylinder head water jacket 300 is connected to the inlet of the radiator 400 and the inlet of the hydraulic retarder 600 respectively via valves. The outlet of the hydraulic retarder 600 is connected to the inlet of the radiator 400. The valves are used to switch the connection between the outlet of the cylinder head water jacket 300 and the inlet of the radiator 400 or the inlet of the hydraulic retarder 600. In other words, valves are installed between the hydraulic retarder 600, the cylinder block water jacket 200, the cylinder head water jacket 300, and the radiator 400. These valves can be opened or closed according to the needs of the hydraulic retarder 600, allowing it to connect to or disconnect from the cooling circulation system. This provides better control over the engine and vehicle's thermal load and achieves energy savings and reduced consumption when using the hydraulic retarder 600.

[0032] Specifically, the valve operates in two modes during the large circulation cycle. In the first mode, when the hydraulic retarder 600 requires no cooling, the coolant flows out through the water pump 100, sequentially through the cylinder block water jacket 200, cylinder head water jacket 300, valve, and radiator 400 before returning to the water pump 100, completing one cycle. In this mode, the coolant does not flow through the hydraulic retarder 600. In the second mode, when the hydraulic retarder 600 requires cooling, the coolant flows out through the water pump 100, sequentially through the cylinder block water jacket 200, cylinder head water jacket 300, valve, hydraulic retarder 600, and radiator 400 before returning to the water pump 100, completing one cycle. In this mode, the coolant flows through the hydraulic retarder 600 before entering the radiator 400. During operation, the valve's movement can be controlled according to whether the hydraulic retarder 600 requires cooling, i.e., whether the hydraulic retarder 600 is operational.

[0033] In this embodiment, the hydraulic retarder 600 can be connected to or used to cool the circulation system. Therefore, on the one hand, it reduces the workload of the water pump 100, with even greater advantages when using an electrically controlled water pump 100. On the other hand, it broadens the application scenarios of the hydraulic retarder 600 and improves the efficiency of auxiliary braking.

[0034] In one embodiment, the valve is a three-way valve 700. The first end A of the three-way valve 700 is connected to the outlet of the cylinder head water jacket 300, the second end B of the three-way valve 700 is connected to the inlet of the hydraulic retarder 600, and the third end C of the three-way valve 700 is connected to the inlet of the radiator 400. The three-way valve 700 can switch the first end A to be connected to either the second end B or the third end C. In the first mode, the first end A of the three-way valve 700 is connected to the third end C, thereby connecting the outlet of the cylinder head water jacket 300 to the inlet of the radiator 400, but not to the hydraulic retarder 600. In the second mode, the first end A of the three-way valve 700 is connected to the second end B, thereby connecting the outlet of the cylinder head water jacket 300 to the inlet of the hydraulic retarder 600. The three-way valve 700 has a simple structure and facilitates mode switching. In other embodiments, the outlet of the cylinder head water jacket 300 can also be connected to the inlet of the radiator 400 through a first shut-off valve, and the outlet of the cylinder head water jacket 300 can be connected to the inlet of the hydraulic retarder 600 through a second shut-off valve. In the first mode, the first shut-off valve is open and the second shut-off valve is closed; in the second mode, the first shut-off valve is closed and the second shut-off valve is open. This also enables the hydraulic retarder 600 to be connected to or disconnected from the cooling circulation system according to its needs.

[0035] In one embodiment, the three-way valve 700 is an electrically controlled three-way valve. An electrically controlled three-way valve is a valve that controls the flow of coolant via an electronic control signal from a controller, such as an ECU, and it has three channels. Using an electrically controlled three-way valve facilitates automatic mode switching control via a controller.

[0036] Furthermore, the coolant circulation system also includes a controller, which is electrically connected to an electronically controlled three-way valve and used to control the valve's operation. Specifically, the controller can be the vehicle's overall controller. If the water pump 100 is an electronically controlled water pump, the controller can be electrically connected to the pump to achieve corresponding control.

[0037] In the embodiments described above that include the hydraulic retarder 600, specifically, the outlet of the oil cooler 800 can be connected to a valve. This valve is used to connect the outlet of the oil cooler 800 to the inlet of the radiator 400 or to the inlet of the hydraulic retarder 600. Taking a three-way valve 700 as an example, the outlet of the oil cooler 800 is connected to the first end A of the three-way valve 700. That is, the first end A of the three-way valve 700 is connected to both the outlet of the oil cooler 800 and the outlet of the cylinder head water jacket 300, further improving the coolant utilization efficiency. Therefore, during the large circulation, the three-way valve 700 has the following two operating modes:

[0038] The first mode corresponds to the hydraulic retarder 600 having no cooling requirement; the coolant circulation principle is as follows: Figure 2As shown, the coolant flows out through the water pump 100, part of which flows through the oil cooler 800, and the other part flows through the cylinder block water jacket 200 and the cylinder head water jacket 300 in sequence, and then enters the first end A of the three-way valve 700. The first end A of the three-way valve 700 is connected to the third end C, and the coolant enters the radiator 400 and then flows back to the water pump 100 to complete one cycle.

[0039] The second mode corresponds to when the hydraulic retarder 600 has a cooling requirement; the coolant circulation principle is as follows: Figure 3 As shown, the coolant flows out through the water pump 100, part of which flows through the oil cooler 800 in sequence, and the other part flows through the cylinder block water jacket 200 and the cylinder head water jacket 300 in sequence, and then enters the first end A of the three-way valve 700. The first end A of the three-way valve 700 is connected to the second end B, and the coolant enters the hydraulic retarder 600. After passing through the hydraulic retarder 600, it flows into the radiator 400, and finally flows back to the water pump 100 to complete one cycle.

[0040] In one embodiment, the water pump 100 is either an electrically controlled water pump or a mechanical water pump. When an electrically controlled water pump is used, it operates according to the instructions of the ECU; when a mechanical water pump is used, it operates via a multi-ribbed belt drive of a pulley system.

[0041] In one embodiment, the outlet of the EGR cooler 500 and the outlet of the radiator 400 can be connected to the water pump 100 via the water pump inlet pipe. If the cylinder head water jacket 300 has multiple outlets, the multiple cylinder head outlets can be connected to the third end C of the three-way valve 700 via the main return water pipe. The inlet of the hydraulic retarder 600 can be connected to the second end B of the three-way valve 700 via the main return water pipe inlet pipe. The outlet of the hydraulic retarder 600 can be connected to the radiator 400 via the main return water pipe outlet pipe.

[0042] Based on the vehicles provided in the above embodiments, the present invention also provides a cooling circulation system, which includes any of the vehicles described in the above embodiments. Since this cooling circulation system uses the vehicles described in the above embodiments, the beneficial effects of this cooling circulation system are explained in the above embodiments.

[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling circulation system, comprising a water pump (100), a cylinder block water jacket (200), a cylinder head water jacket (300), a radiator (400), and an EGR cooler (500); characterized in that, The outlet of the water pump (100) is connected to the inlet of the cylinder block water jacket (200), the outlet of the cylinder block water jacket (200) is connected to the inlet of the cylinder head water jacket (300) and the inlet of the EGR cooler (500), the outlet of the cylinder head water jacket (300) is connected to the inlet of the radiator (400), the outlet of the radiator (400) is connected to the inlet of the water pump (100), and the outlet of the EGR cooler (500) is connected to the inlet of the water pump (100). It also includes a hydraulic retarder (600) and a valve. The outlet of the cylinder head water jacket (300) is connected to the inlet of the radiator (400) and the inlet of the hydraulic retarder (600) respectively through the valve. The outlet of the hydraulic retarder (600) is connected to the inlet of the radiator (400). The valve is used to switch the outlet of the cylinder head water jacket (300) to be connected to the inlet of the radiator (400) or to the inlet of the hydraulic retarder (600). The valve is a three-way valve (700). The first end (A) of the three-way valve (700) is connected to the outlet of the cylinder head water jacket (300), the second end (B) of the three-way valve (700) is connected to the inlet of the hydraulic retarder (600), and the third end (C) of the three-way valve (700) is connected to the inlet of the radiator (400). The three-way valve (700) can switch the first end (A) to be connected to the second end (B) or the third end (C). The inlet of the oil cooler (800) of the cooling circulation system is connected to the outlet of the water pump (100), and the outlet of the oil cooler (800) is connected to the first end (A) of the three-way valve (700). When the hydraulic retarder (600) has no cooling requirement, the first end (A) and the third end (C) of the three-way valve (700) are connected. When the hydraulic retarder (600) has a cooling requirement, the first end (A) and the second end (B) of the three-way valve (700) are connected.

2. The cooling circulation system according to claim 1, characterized in that, The three-way valve (700) is an electrically controlled three-way valve.

3. The cooling circulation system according to claim 2, characterized in that, It also includes a controller, which is electrically connected to the electrically controlled three-way valve and is used to control the operation of the electrically controlled three-way valve.

4. The cooling circulation system according to claim 1, characterized in that, The water pump (100) is an electrically controlled water pump or a mechanical water pump.

5. A vehicle, characterized in that, Includes the cooling circulation system as described in any one of claims 1-4.

Images