CN211549859U - Range-extended vehicle EGR cooling system and vehicle - Google Patents

Abstract

The utility model provides an EGR cooling system for an extended-range vehicle and a vehicle, which relate to the field of vehicles. The EGR cooling system of the extended-range vehicle includes an engine, a warm air pipe, an EGR cooler, a control valve and a water pump, wherein the engine, the warm air pipe, the control valve, the EGR cooler and the water pump are connected in sequence to form a water cooling circuit, and the water inlet of the EGR cooler Connected with the warm air pipe, the water outlet of the EGR cooler is connected with the water pump, and the engine is also directly connected with the EGR cooler to form a gas circuit. The control valve is used to regulate the flow of liquid from the warm air duct into the EGR cooler, thereby cooling the gas flowing from the engine into the EGR cooler to within a preset temperature range. The utility model has a simple structure, can efficiently cool the exhaust gas, shortens the cooling time of the exhaust gas, and can ensure that the outlet temperature of the EGR cooler is within the optimal preset range, thereby improving the combustion efficiency of the range extender.

Description

EGR cooling system for extended-range vehicle and vehicle

technical field

The utility model relates to the field of vehicles, in particular to an EGR cooling system for an extended-range vehicle and a vehicle.

Background technique

With the increasingly severe global energy and environmental situation, new energy vehicles represented by pure electric vehicles, plug-in hybrid electric vehicles and fuel cell vehicles have become an important direction for future automotive development. Among them, pure electric vehicles mainly have shortcomings such as high cost, weak endurance, long charging time and short service life. In order to solve these problems, high-efficiency range extender products are gradually emerging.

The range extender has the advantage of high fuel economy. In order to further improve the fuel economy of the range extender and enhance the advantages of the range extender, an EGR (Exhaust Gas Re-circulation, exhaust gas recirculation) system is installed on the range extender. It has been verified that the EGR system can reduce fuel consumption and NOx emissions. For the EGR system installed on the range extender, an EGR cooling system solution for the extended range vehicle is designed, so that the EGR system can meet the usage requirements.

However, due to the complex structure of the vehicle in the prior art, if an EGR system is added, a cooling system needs to be arranged in the cooling water circuit of the cylinder block to cool the EGR, which is difficult to arrange and the cost is high, and it is difficult to keep the outlet temperature of the EGR cooling system at Within the optimal temperature range, the optimal combustion efficiency cannot be achieved.

Utility model content

The purpose of the first aspect of the present invention is to provide an EGR cooling system for an extended-range vehicle, which solves the problem of low combustion efficiency caused by the inability to maintain the outlet temperature of the EGR cooling system within a preset range in the prior art.

The purpose of the second aspect of the present invention is to provide a vehicle.

According to the purpose of the first aspect of the present utility model, the present utility model provides an EGR cooling system for an extended-range vehicle, including an engine, a warm air duct, an EGR cooler, a control valve and a water pump, wherein,

The engine, the warm air pipe, the control valve, the EGR cooler and the water pump are connected in sequence to form a water cooling circuit, the water inlet of the EGR cooler is connected to the warm air pipe, and the EGR cools The water outlet of the cooler is connected with the water pump, and the engine is also directly connected with the EGR cooler to form a gas circuit;

The control valve is used to adjust the flow rate of the liquid flowing into the EGR cooler from the warm air duct, thereby cooling the gas flowing into the EGR cooler from the engine to a predetermined temperature range.

Optionally, the gas circuit further includes:

a first air temperature sensor, disposed between the intake port of the EGR cooler and the engine, for detecting the temperature of the intake port of the EGR cooler;

A second air temperature sensor is provided between the air outlet of the EGR cooler and the engine, and is used to detect the temperature of the air outlet of the EGR cooler.

Optionally, the water cooling circuit further includes:

a first water temperature sensor, arranged between the warm air duct and the EGR cooler, for detecting the temperature of the water inlet of the EGR cooler;

A second water temperature sensor, disposed between the EGR cooler and the water pump, is used to detect the temperature of the water outlet of the EGR cooler.

Optionally, the control valve is an electronic throttle valve.

Optionally, also include:

a controller, connected to both the second air temperature sensor and the control valve, and configured to adjust the opening degree of the control valve according to the temperature of the outlet port of the EGR cooler detected by the second air temperature sensor, so as to control The flow rate of the liquid into the EGR cooler.

Optionally, the controller is also connected to both the first air temperature sensor and the first water temperature sensor, for when the water temperature detected by the first water temperature sensor is not less than the water temperature detected by the first air temperature sensor. The control valve is controlled to close when the air temperature is reached.

According to the purpose of the second aspect of the present invention, the present invention also provides a vehicle, which is installed with the above-mentioned EGR cooling system for the extended-range vehicle.

The utility model comprises an engine, a warm air pipe, an EGR cooler, a control valve and a water pump, wherein the engine, the warm air pipe, the control valve, the EGR cooler and the water pump are connected in sequence to form a water cooling circuit, and the water inlet of the EGR cooler is connected to the warm air The pipe is connected, the water outlet of the EGR cooler is connected with the water pump, and the engine is also directly connected with the EGR cooler to form a gas circuit. The control valve is used to regulate the flow of liquid from the warm air duct into the EGR cooler, thereby cooling the gas flowing from the engine into the EGR cooler to within a preset temperature range. The water inlet of the EGR cooler provided by the utility model is directly connected with the warm air pipe, and the water outlet of the EGR cooler is connected with the water pump, the structure is simple, the exhaust gas can be cooled efficiently, the cooling time of the exhaust gas is shortened, and the EGR can be ensured. The outlet temperature of the cooler is within a preset preset range, thereby improving the combustion efficiency of the range extender.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic structural diagram of an EGR cooling system for an extended-range vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a water cooling circuit of the EGR cooling system of the extended-range vehicle shown in FIG. 1;

FIG. 3 is a schematic flow diagram of a gas circuit of the extended-range vehicle EGR cooling system shown in FIG. 1 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

1 is a schematic structural diagram of an EGR cooling system for an extended-range vehicle according to an embodiment of the present invention, FIG. 2 is a schematic flow diagram of a water cooling circuit of the EGR cooling system for an extended-range vehicle shown in FIG. 1 , and FIG. 3 is FIG. 1 Schematic flow diagram of the gas circuit of the extended-range vehicle EGR cooling system shown. As shown in Figure 1-3, the direction of the arrow in Figure 2 is the flow direction of the water cooling circuit, and the direction of the arrow in Figure 3 is the flow direction of the gas circuit. In a specific embodiment, the extended-range vehicle EGR cooling system 100 may generally include an engine 1, a warm air duct 2, an EGR cooler 3, a control valve 5 and a water pump 4, wherein the engine 1, the warm air duct 2, The control valve 5, the EGR cooler 3 and the water pump 4 are connected in sequence to form a water cooling circuit, the water inlet of the EGR cooler 3 is connected to the warm air pipe 2, the water outlet of the EGR cooler 3 is connected to the water pump 4, and the engine 1 is also cooled by the EGR. The device 3 is directly connected to form a gas circuit. The control valve 5 is used to adjust the flow rate of the liquid flowing into the EGR cooler 3 from the warm air duct 2 , thereby cooling the gas flowing into the EGR cooler 3 from the engine 1 to a predetermined temperature range. Among them, the control valve 5 is an electronic throttle valve.

The water inlet of the EGR cooler 3 provided by the present invention is directly connected with the warm air pipe 2, and the water outlet of the EGR cooler 3 is connected with the water pump 4, the structure is simple, the exhaust gas can be cooled efficiently, and the cooling time of the exhaust gas is shortened, And it can ensure that the outlet temperature of the EGR cooler 3 is within the optimal preset range, thereby improving the combustion efficiency of the range extender.

Specifically, the gas circuit further includes a first air temperature sensor 8 and a second air temperature sensor 9 . The first air temperature sensor 8 is provided between the intake port of the EGR cooler 3 and the engine 1 for detecting the intake port temperature of the EGR cooler 3 . The second air temperature sensor 9 is provided between the air outlet of the EGR cooler 3 and the engine 1 , and detects the temperature of the air outlet of the EGR cooler 3 . In the present invention, the first air temperature sensor 8 and the second air temperature sensor 9 are arranged to monitor the air inlet temperature and the air outlet temperature of the EGR cooler 3 at all times.

Further, the water cooling circuit further includes a first water temperature sensor 6 and a second water temperature sensor 7 . The first water temperature sensor 6 is arranged between the warm air duct 2 and the EGR cooler 3 for detecting the water inlet temperature of the EGR cooler 3, and the second water temperature sensor 7 is arranged between the EGR cooler 3 and the water pump 4 for detecting the temperature of the water inlet of the EGR cooler 3. The temperature of the water outlet of the EGR cooler 3 is detected. In the present invention, the first water temperature sensor 6 and the second water temperature sensor 7 are arranged to monitor the temperature of the water inlet and the water outlet of the EGR cooler 3 at all times.

In one embodiment, the extended-range vehicle EGR cooling system 100 further includes a controller 10 , which is connected with the second air temperature sensor 9 and the control valve 5 , and is used for detecting the output of the EGR cooler 3 according to the second air temperature sensor 9 . The port temperature adjusts the opening of the control valve 5 to control the flow rate of the liquid flowing into the EGR cooler 3 .

Specifically, the controller 10 is configured to adjust the opening degree of the control valve 5 to the first preset opening degree when the outlet temperature of the EGR cooler 3 is less than the first preset temperature, so as to increase the outlet temperature of the EGR cooler 3 . When the outlet temperature of the EGR cooler 3 is greater than the second preset temperature, the opening degree of the control valve 5 is adjusted to the second preset opening degree, so as to reduce the outlet temperature of the EGR cooler 3, wherein the first preset temperature The opening degree is smaller than the second preset opening degree. That is to say, when the temperature of the air outlet of the EGR cooler 3 is low, the flow rate flowing into the EGR cooler 3 is reduced to avoid heat loss to the gas flowing into the EGR cooler 3, so that the air outlet of the EGR cooler 3 is prevented from causing heat loss. lower temperature. When the temperature of the air outlet of the EGR cooler 3 is high, the flow rate flowing into the EGR cooler 3 is increased to take away more heat of the gas in the EGR cooler 3, so that the air outlet of the EGR cooler 3 can be removed as soon as possible. temperature dropped. Here, the first preset opening degree and the second preset opening degree are set according to specific conditions.

Further, the controller 10 is further configured to adjust the opening degree of the control valve 5 to a third preset opening degree when the outlet temperature of the EGR cooler 3 is between the first preset temperature and the second preset temperature, so as to The outlet temperature of the EGR cooler 3 is stabilized between the first preset temperature and the second preset temperature. Here, the third preset opening degree is set according to a specific situation, or is set according to an empirical value.

In yet another embodiment, the controller 10 is also connected to both the first water temperature sensor 6 and the first air temperature sensor 8 , which is used when the water temperature detected by the first water temperature sensor 6 is not less than the air temperature detected by the first air temperature sensor 8 When the control valve 5 is closed.

The present invention also provides a vehicle, which is installed with the extended-range vehicle EGR cooling system 100 in any of the above embodiments. The extended-range vehicle EGR cooling system 100 will not be repeated here.

In the present invention, the control valve 5 is used to control the flow of the liquid flowing into the EGR cooler 3, thereby controlling the heat loss of the gas flowing into the EGR cooler 3, so as to ensure that the outlet temperature of the EGR cooler 3 is stable at a preset threshold value Within the range, the outlet temperature of the EGR cooler 3 can be precisely controlled, which further improves the fuel efficiency of the range extender and reduces the NOx emission.

By now, those skilled in the art will recognize that although various exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, Numerous other variations or modifications consistent with the principles of the present invention are directly identified or derived from the disclosure of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (7)

1. An EGR cooling system for an extended-range vehicle, characterized in that, comprising an engine, a warm air duct, an EGR cooler, a control valve and a water pump, wherein, The engine, the warm air pipe, the control valve, the EGR cooler and the water pump are connected in sequence to form a water cooling circuit, the water inlet of the EGR cooler is connected to the warm air pipe, and the EGR cools The water outlet of the cooler is connected with the water pump, and the engine is also directly connected with the EGR cooler to form a gas circuit; The control valve is used to adjust the flow rate of the liquid flowing into the EGR cooler from the warm air duct, thereby cooling the gas flowing into the EGR cooler from the engine to a predetermined temperature range. 2. The extended-range vehicle EGR cooling system of claim 1, wherein the gas circuit further comprises: a first air temperature sensor, disposed between the intake port of the EGR cooler and the engine, for detecting the temperature of the intake port of the EGR cooler; A second air temperature sensor is provided between the air outlet of the EGR cooler and the engine, and is used to detect the temperature of the air outlet of the EGR cooler. 3. The extended-range vehicle EGR cooling system according to claim 2, wherein the water cooling circuit further comprises: a first water temperature sensor, arranged between the warm air duct and the EGR cooler, for detecting the temperature of the water inlet of the EGR cooler; A second water temperature sensor, disposed between the EGR cooler and the water pump, is used to detect the temperature of the water outlet of the EGR cooler. 4. The extended-range vehicle EGR cooling system according to claim 1, wherein, The control valve is an electronic throttle valve. 5. The extended-range vehicle EGR cooling system of claim 3, further comprising: a controller, connected to both the second air temperature sensor and the control valve, and configured to adjust the opening degree of the control valve according to the temperature of the outlet port of the EGR cooler detected by the second air temperature sensor, so as to control The flow rate of the liquid into the EGR cooler. 6. The extended-range vehicle EGR cooling system according to claim 5, wherein, The controller is also connected to both the first air temperature sensor and the first water temperature sensor, and is used to control the water temperature when the water temperature detected by the first water temperature sensor is not less than the air temperature detected by the first air temperature sensor. The control valve is closed. 7 . A vehicle, characterized in that, the extended-range vehicle EGR cooling system according to any one of claims 1 to 6 is installed.

Images