Engine cooling system for extended-range vehicle

Abstract

The utility model discloses an extended range vehicle engine cooling system which comprises a first loop, a second loop and a third loop, the first loop comprises a first electronic water pump, a cylinder body water jacket, a cylinder cover water jacket, a thermolator, an EGR cooler and an engine oil cooler which are communicated in sequence; the second loop comprises a second electronic water pump, a heater, a warm air core body and a three-way proportional regulating valve which are communicated in sequence, an inlet of the second electronic water pump is communicated with an inlet of the engine oil cooler, a first port of the three-way proportional regulating valve is communicated with an outlet of the warm air core body, and a second port of the three-way proportional regulating valve is communicated with an outlet of the engine oil cooler; a port 3 of the three-way proportional regulating valve is communicated with an inlet of the second electronic water pump; the third loop comprises a radiator, an inlet of the radiator is communicated with the thermolator, and an outlet of the radiator is communicated with an inlet of the first electronic water pump.

Description

Technical Field

[0001] The utility model relates to the field of vehicle engines, in particular to a cooling system for an engine of a range-extended vehicle. Background Art

[0002] The function of the engine cooling system is to quickly warm up the engine when it is cold-started. When the engine temperature rises, the coolant circulation is used to cool the engine components so that the engine always operates within the optimal water temperature range.

[0003] Patent CN204827634U discloses a car engine cooling system, including an engine water jacket, a water storage bottle, an electronic thermostat, a thermostat mounting seat, a water pump, a radiator, a supercharger water jacket, an oil cooler, and a heater core. The thermostat mounting seat is connected to the heater core and the supercharger through pipelines, the heater core and the supercharger are connected to the water pump through pipelines, the electronic thermostat is connected to the radiator and the oil cooler through pipelines, the radiator and the oil cooler are connected to the water pump through pipelines, and the water storage bottle is connected to the water pump through pipelines. A thermostat exhaust pipe is connected to the thermostat mounting seat and connected to the water storage bottle. A throttle valve is arranged on the thermostat exhaust pipe. This design enables the system to have a good exhaust function through the thermostat exhaust pipe from the time the engine is started to the time the large cycle is not opened, avoids engine cavitation, and reduces the water flow in the exhaust pipe at the moment of engine start, thereby improving the comfort of the car. However, the heater core of the cooling system disclosed in the above-mentioned comparative document cannot form an independent circuit, and cannot be operated and controlled independently. When the passenger compartment needs to be cooled in summer, the high-temperature coolant flowing through the heater core will affect the cooling effect of the passenger compartment. Utility Model Content

[0004] The utility model aims to provide an engine cooling system for a range-extended vehicle, so as to solve the problem that a warm air core of an existing cooling system cannot heat a passenger compartment through an independent circuit.

[0005] In order to solve the above technical problems, the present invention provides an engine cooling system for a range-extended vehicle, comprising:

[0006] The first circuit includes a first electronic water pump, a cylinder water jacket, a cylinder head water jacket, a thermostat, an EGR cooler, an oil cooler and the first electronic water pump which are connected in sequence;

[0007] The second circuit includes a second electronic water pump, a heater, a heater core, a three-way proportional regulating valve and the second electronic water pump which are connected in sequence, the inlet of the second electronic water pump is connected to the inlet of the oil cooler, the port 1 of the three-way proportional regulating valve is connected to the outlet of the heater core, the port 2 of the three-way proportional regulating valve is connected to the outlet of the oil cooler, and the port 3 of the three-way proportional regulating valve is connected to the inlet of the second electronic water pump;

[0008] The third circuit includes a radiator, an inlet of the radiator is connected to the thermostat, and an outlet of the radiator is connected to the inlet of the first electronic water pump.

[0009] Furthermore, a temperature sensor is provided between the thermostat and the EGR cooler.

[0010] Furthermore, the system also includes a turbocharger, the inlet of the turbocharger is communicated with the cylinder water jacket, and the outlet of the turbocharger is communicated with the inlet of the oil cooler.

[0011] Furthermore, the system also includes an expansion kettle, which is respectively connected to the cylinder water jacket, the radiator, the outlet end of the EGR cooler and the inlet end of the first water pump.

[0012] The beneficial effects of the utility model are as follows: by directly arranging a thermostat at the outlet end of the cylinder head water jacket, the traditional small circulation loop is reduced, thereby reducing the overall cost of the system; by connecting the warm air core in series with a three-way proportional regulating valve and a heater in the second circuit, the waste heat recovery requirements of the warm air can be met in winter, and the warm air circulation can be closed in summer, thereby reducing the influence of high-temperature coolant on the refrigeration of the front cabin, allowing more coolant to flow through the oil cooler, thereby increasing the heat exchange capacity of the oil cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0015] Among them: 1. First electronic water pump; 2. Cylinder water jacket; 3. Cylinder head water jacket; 4. Thermostat; 5. EGR cooler; 6. Oil cooler; 7. Second electronic water pump; 8. Heater; 9. Warm air core; 10. Three-way proportional control valve; 11. Turbocharger; 12. Radiator; 13. Expansion kettle. DETAILED DESCRIPTION

[0016] like Figure 1 The engine cooling system of the extended-range vehicle shown includes a first circuit, a second circuit and a third circuit; each circuit is described in detail below:

[0017] The first circuit includes a first electronic water pump 1, a cylinder water jacket 2, a cylinder head water jacket 3, a thermostat 4, an EGR cooler 5, an oil cooler 6 and the first electronic water pump 1 which are connected in sequence;

[0018] The second circuit includes a second electronic water pump 7, a heater 8, a heater core 9, a three-way proportional regulating valve 10 and the second electronic water pump 7 which are connected in sequence, the inlet of the second electronic water pump 7 is connected to the inlet of the oil cooler 6, the port 1 of the three-way proportional regulating valve 10 is connected to the outlet of the heater core 9, the port 2 of the three-way proportional regulating valve 10 is connected to the outlet of the oil cooler 6, and the port 3 of the three-way proportional regulating valve 10 is connected to the inlet of the second electronic water pump 7;

[0019] The third circuit includes a radiator 12 , an inlet of the radiator 12 is connected to the thermostat 4 , and an outlet of the radiator 12 is connected to the inlet of the first electronic water pump 1 .

[0020] The system works as follows:

[0021] 1. Small cycle mode

[0022] At this time, the circulation of the engine coolant is as follows: under the action of the first electronic water pump 1, the coolant passes through the cylinder water jacket 2, the cylinder head water jacket 3, the thermostat 4 and the EGR cooler 5 in sequence, and then is divided into two paths, entering the oil cooler 6 and the second circuit respectively. The oil cooler 6 and the heater core 9 simultaneously recover the waste heat of the coolant. Among them, after the coolant enters the second circuit, it passes through the second electronic water pump 7, the heater 8, the heater core 9 in sequence and then reaches the three-way proportional regulating valve 10, and the flow is distributed through the three-way proportional regulating valve 10.

[0023] 2. Large cycle mode

[0024] At this time, the circulation of the engine coolant is as follows: under the action of the first electronic water pump 1, the coolant passes through the cylinder water jacket 2 and the cylinder head water jacket 3 in sequence, and is divided into two paths through the thermostat 4. One path passes through the radiator 12 and returns to the first water pump; the other path passes through the EGR cooler 5 and enters the oil cooler 6 and the second circuit respectively; among them, after the coolant enters the second circuit, it passes through the second electronic water pump 7, the heater 8, and the heater core 9 in sequence and reaches the three-way proportional regulating valve 10, and the flow is distributed through the three-way proportional regulating valve 10.

[0025] When the winter low-temperature pure electric mode is started, ports 1 and 3 of the three-way proportional regulating valve 10 are connected, the heater 8 is powered on, the second water pump runs, and the second circuit forms an independent cycle to heat the passenger compartment.

[0026] When the winter low-temperature range extender mode is started, during the warm-up stage, ports 1 and 3 of the three-way proportional regulating valve 10 are connected, the heater 8 is powered on, and the second water pump operates to form an independent cycle to heat the passenger compartment; when the water temperature of the range extender reaches above 65°C, during the warm-up stage, the three-way proportional regulating valve 10 is switched from ports 1 and 3 connected to ports 1 and 2 connected, the heater 8 gradually reduces its duty cycle until it is powered off, and the operation of the second water pump forms a mixed cycle with the high-temperature coolant of the range extender to heat the passenger compartment.

[0027] In summer mode, ports 1 and 3 of the three-way proportional regulating valve 10 are connected, ports 1 and 2 are closed, and the second water pump is powered off and does not run, thereby ensuring that the refrigeration condition is not affected by the convection of the high-temperature coolant.

[0028] The system reduces the traditional small circulation loop and reduces the overall cost of the system by directly setting the thermostat 4 at the outlet end of the cylinder head water jacket 3; by connecting the warm air core 9 in series with the three-way proportional control valve 10 and the heater 8 in the second loop, the waste heat recovery requirements of the warm air can be met in winter, and the warm air circulation can be closed in summer, reducing the impact of high-temperature coolant on the cooling of the front cabin, allowing more coolant to flow through the oil cooler 6, thereby increasing the heat exchange capacity of the oil cooler 6. According to one embodiment of the present application, a temperature sensor is provided between the thermostat 4 and the EGR cooler 5.

[0029] According to an embodiment of the present application, a temperature sensor is provided between the thermostat 4 and the EGR cooler 5. The outlet water temperature of the engine can be monitored by the outlet water temperature of the engine.

[0030] According to one embodiment of the present application, the system further includes a turbocharger 11, the inlet of the turbocharger 11 is communicated with the cylinder water jacket 2, and the outlet of the turbocharger 11 is communicated with the inlet of the oil cooler 6. By directly connecting the turbocharger 11 with the cylinder water jacket 2, a portion of the coolant in the cylinder water jacket 2 directly enters the turbocharger 11 for cooling.

[0031] According to one embodiment of the present application, the system further includes an expansion kettle 13, which is respectively connected to the outlet end of the cylinder water jacket 2, the radiator 12, the EGR cooler 5 and the inlet end of the first water pump. The expansion kettle 13 can replenish water to the first water pump after cooling the steam in the radiator 12, the engine water channel and the first circuit.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An extended range vehicle engine cooling system, characterized in that: include The first circuit includes a first electronic water pump, a cylinder water jacket, a cylinder head water jacket, a thermostat, an EGR cooler, an oil cooler and the first electronic water pump which are connected in sequence; The second circuit includes a second electronic water pump, a heater, a heater core, a three-way proportional regulating valve and the second electronic water pump which are connected in sequence, wherein the inlet of the second electronic water pump is connected to the inlet of the oil cooler, the port 1 of the three-way proportional regulating valve is connected to the outlet of the heater core, the port 2 of the three-way proportional regulating valve is connected to the outlet of the oil cooler, and the port 3 of the three-way proportional regulating valve is connected to the inlet of the second electronic water pump; The third circuit includes a radiator, the inlet of the radiator is connected to the thermostat, and the outlet of the radiator is connected to the inlet of the first electronic water pump.

2. The extended range vehicle engine cooling system according to claim 1, characterized in that: A temperature sensor is provided between the thermostat and the EGR cooler.

3. The range-extended vehicle engine cooling system according to claim 1, characterized in that: The system further comprises a turbocharger, wherein an inlet of the turbocharger is communicated with the cylinder water jacket, and an outlet of the turbocharger is communicated with an inlet of an oil cooler.

4. The range-extended vehicle engine cooling system according to claim 1, characterized in that: The system also includes an expansion kettle, which is respectively connected to the cylinder water jacket, the radiator, the outlet end of the EGR cooler and the inlet end of the first water pump.

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