Carbon tank desorption system and vehicle

Abstract

The utility model provides a carbon tank desorption system and a vehicle, the carbon tank desorption system comprises an air filter, a carbon tank and a heat conduction unit, the air filter is arranged on an air inlet pipeline of an engine, and the carbon tank is connected between an air inlet end of the engine and a fuel tank. The heat conduction unit comprises a flow dividing pipeline and a heat conduction device, the flow dividing pipeline is connected between the air outlet end of the air filter and the air inlet end of the carbon tank, and the heat conduction device is connected between the flow dividing pipeline and an exhaust pipeline of the engine so that gas heat in the exhaust pipeline can be conducted to the flow dividing pipeline. According to the carbon tank desorption system disclosed by the utility model, the heat conduction unit is arranged, so that air which is shunted into the shunting pipeline by the air filter can be heated by heat of gas in the exhaust pipeline through the heat conduction device, and therefore, the temperature of the air at the air inlet end of the carbon tank can be improved, and the desorption efficiency of the carbon tank can be further improved; and excessive pollutant emission caused by excessive loading capacity of the carbon tank is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle air intake, in particular to a carbon canister desorption system. Meanwhile, the utility model also relates to a vehicle provided with the carbon canister desorption system. Background Art

[0002] In order to prevent the volatile vapor in the fuel tank from being discharged into the atmosphere, a carbon canister is generally installed between the fuel tank and the engine on the current vehicle. When the engine is turned off, the fuel vapor is adsorbed and stored in the carbon canister, which is the adsorption process. When the engine is started, the solenoid valve of the carbon canister opens, and the fuel vapor adsorbed in the carbon canister is brought into the engine cylinder by clean air to participate in combustion under the vacuum of the intake pipe, which is the desorption process.

[0003] However, in the prior art, the air inhaled by the carbon canister is usually the air in the external environment where the vehicle is located, which has a lower temperature. In addition, the desorption process is an endothermic process, which leads to a low desorption efficiency of the carbon canister. Especially in low temperature areas, the problem of low desorption efficiency of the carbon canister will be more prominent. Utility Model Content

[0004] In view of this, the utility model aims to provide a carbon canister desorption system to improve the desorption efficiency of the carbon canister.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A carbon canister desorption system comprises an air filter, a carbon canister and a heat transfer unit;

[0007] The air filter is arranged on the air intake pipeline of the engine, and the carbon canister is connected between the air intake end of the engine and the fuel tank;

[0008] The heat transfer unit includes a bypass pipeline and a heat transfer device, wherein the bypass pipeline is connected between the air outlet end of the air filter and the air inlet end of the carbon canister, and the heat transfer device is connected between the bypass pipeline and the exhaust pipeline of the engine to transfer the heat of the gas in the exhaust pipeline to the bypass pipeline.

[0009] Furthermore, the shunt pipeline is provided with a first switch part;

[0010] The first switch unit is connected to the controller signal and is used to control the on-off of the shunt pipeline.

[0011] Further, it also includes a first detection unit and a second detection unit connected to the controller signal;

[0012] The first detection unit is disposed at the air inlet end of the carbon canister and is used to detect the gas temperature at the air inlet end of the carbon canister. The second detection unit is used to detect the temperature of the outside air.

[0013] The first detection unit is connected to the controller signal and is used to detect the gas temperature at the air inlet end of the carbon canister.

[0014] Furthermore, the air inlet end of the carbon canister is provided with a carbon canister air inlet pipe, and the diverter pipeline is connected to the carbon canister air inlet pipe;

[0015] The carbon canister air inlet pipe is provided with a second switch part, which is connected to the controller signal and is used to control the connection and disconnection between the carbon canister air inlet pipe and the outside world.

[0016] Furthermore, it also includes a second detection unit connected to the controller signal, and the second detection unit is used to detect the temperature of the external air.

[0017] Furthermore, a third switch unit is provided on the connecting pipeline between the carbon canister and the air intake end of the engine;

[0018] The third switch unit is connected to the controller signal and is used to control the on-off of the connecting pipeline.

[0019] Furthermore, the heat conduction device adopts a heat pipe.

[0020] Furthermore, the exhaust pipe is provided with a post-processor and a muffler arranged in sequence along the exhaust path;

[0021] One end of the heat conduction device is arranged on the pipeline between the post-processor and the muffler, and the other end is arranged on the diversion pipeline.

[0022] Further, it also includes a turbocharger and an intercooler;

[0023] The compression wheel of the turbocharger is arranged on the intake pipeline, the intercooler is arranged between the compression wheel and the intake end of the engine, and the turbine of the turbocharger is arranged on the exhaust pipeline.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] A carbon canister desorption system described in the utility model, by providing a heat conduction unit, can transfer the heat of the gas in the exhaust pipe through the heat conduction device to heat the air in the diversion pipe diverted from the air filter, thereby increasing the air temperature at the air inlet end of the carbon canister, thereby improving the desorption efficiency of the carbon canister and avoiding excessive pollutant emissions due to excessive carbon canister load.

[0026] In addition, by setting the first switch part, the air flow rate delivered to the air inlet end of the carbon canister can be controlled, so as to help adjust the air temperature at the air inlet end of the carbon canister to within the design range. The setting of the first detection part can accurately obtain the gas temperature at the air inlet end of the carbon canister, which helps to accurately control the opening and closing of the first switch part; the second detection part can accurately obtain the temperature of the outside air, which helps the controller to accurately control. By setting the carbon canister air inlet pipe and setting the second switch part that controls the opening and closing between the carbon canister air inlet pipe and the outside world, the traditional desorption mode can be realized using outside air.

[0027] Secondly, a third switch is provided on the connecting pipe between the carbon canister and the intake end of the engine to prevent the gas in the carbon canister from entering the engine when the engine is turned off. The heat transfer device uses a heat pipe, which has a simple structure and mature technology. It is not only easy to design and implement, but also has good heat transfer efficiency.

[0028] In addition, by installing a post-processor on the exhaust pipe, the exhaust gas after combustion can be subjected to an oxidation-reduction reaction to purify hydrocarbons. By installing an intercooler, the intake temperature of the engine can be reduced to prevent the temperature inside the engine from being too high and reducing its working performance.

[0029] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with a carbon canister desorption system as described above.

[0030] The vehicle described in the utility model has all the beneficial effects of the carbon canister desorption system of the above-mentioned vehicle, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0032] Figure 1 This is a structural schematic diagram of a carbon canister desorption system according to an embodiment of the utility model;

[0033] Figure 2 A desorption path of a carbon canister desorption system in a traditional desorption mode according to an embodiment of the utility model;

[0034] Figure 3 A desorption path of a carbon canister desorption system in a split-flow desorption mode according to an embodiment of the utility model;

[0035] Figure 4 This is a desorption path of a carbon canister desorption system in a high-efficiency desorption mode described in an embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 1. Air filter; 2. Intercooler; 3. Turbocharger; 4. Engine; 5. Post-processor; 6. Muffler; 7. Heat pipe; 8. First detection unit; 9. Carbon canister intake pipe; 10. Second switch unit; 11. Fuel tank; 12. Carbon canister; 13. Third switch unit; 14. Diverter pipeline; 15. First switch unit;

[0038] 301. Pressure wheel; 302. Turbine. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] The present embodiment relates to a carbon canister desorption system, which utilizes the high temperature heat of the exhaust pipe to conduct to the bypass pipe 14 of the air filter 1 to achieve air heating, thereby increasing the air temperature in the carbon canister 12, thereby solving the problem of low desorption efficiency of the carbon canister 12.

[0044] In terms of overall structure, the carbon canister desorption system includes an air filter 1, a carbon canister 12 and a heat transfer unit, wherein the air filter 1 is arranged on the intake pipe of the engine 4, and the carbon canister 12 is connected between the intake end of the engine 4 and the fuel tank 11. The heat transfer unit includes a shunt pipe 14 and a heat transfer device, wherein the shunt pipe 14 is connected between the outlet end of the air filter 1 and the intake end of the carbon canister 12, and the heat transfer device is connected between the shunt pipe 14 and the exhaust pipe of the engine 4, so as to transfer the heat of the gas in the exhaust pipe to the shunt pipe 14.

[0045] A carbon canister desorption system of the present embodiment, by providing a heat conduction unit, can use the heat of the gas in the exhaust pipe to heat the air diverted from the air filter 1 to the diversion pipe 14 through the heat conduction device, thereby increasing the air temperature in the intake end of the carbon canister 12, and further increasing the desorption efficiency of the carbon canister 12, thereby avoiding excessive pollutant emissions due to excessive load of the carbon canister 12.

[0046] Based on the above overall design, an exemplary structure of a carbon canister desorption system of this embodiment is as follows: Figure 1 As shown in , as a preferred embodiment, this embodiment also includes a turbocharger 3 and an intercooler 2. In addition, the compressor wheel 301 of the turbocharger 3 is arranged on the intake pipe, the intercooler 2 is arranged between the compressor wheel 301 and the intake end of the engine 4, and the turbine 302 of the turbocharger 3 is arranged on the exhaust pipe. The arrangement of the intercooler 2 can reduce the intake temperature of the engine 4, preventing the temperature inside the engine 4 from being too high and reducing its working performance.

[0047] The exhaust pipe is specifically connected to the outlet end of the turbine 302. In this embodiment, in order to further prevent the pollutant emission from exceeding the standard, as a further implementation method, the exhaust pipe is provided with a post-processor 5 and a muffler 6 arranged in sequence along the exhaust path. In addition, one end of the heat transfer device is arranged on the pipe between the post-processor 5 and the muffler 6, and the other end is arranged on the diversion pipe 14. Figure 1 As shown in , the post-processor 5 is specifically connected to the turbine 302, and the specific structures of the post-processor 5, the muffler 6 and the turbocharger 3 can refer to the prior art and will not be repeated here.

[0048] In this embodiment, as a preferred implementation, the heat conduction device uses a heat pipe 7, which fully utilizes the heat conduction principle and the rapid heat transfer property of the phase change medium. The heat of the heat-generating object is transferred to the heat source through the heat pipe 7, and its thermal conductivity exceeds the thermal conductivity of the existing known metals. In specific implementation, the heat pipe 7 can adopt an existing structure or be designed with reference to the existing technology. It should be noted that in addition to the heat pipe 7, the heat conduction device can also adopt other existing structures that can achieve heat exchange.

[0049] As a further implementation, a first switch unit 15 is provided on the shunt pipeline 14, and the first switch unit 15 is connected to the controller signal and is used to control the on and off of the shunt pipeline 14. In this embodiment, by providing the first switch unit 15 and opening and closing the first switch unit 15, the air flow rate delivered to the intake end of the carbon canister 12 can be controlled, and the heating of air with different flow rates by the heat pipe 7 can help adjust the air temperature at the intake end of the carbon canister 12 to within the designed range. In addition, in order to obtain a better use effect, the first switch unit 15 preferably adopts a solenoid valve with multiple openings in the prior art, so that its opening can be controlled by the controller, and the air temperature can be adjusted more accurately. In addition, the controller can specifically adopt a vehicle ECU (short for Electronic Control Unit), that is, an electronic control unit.

[0050] As a further implementation, Figure 1 As shown in , a carbon canister desorption system of this embodiment also includes a first detection unit 8 and a second detection unit connected to the controller signal. In addition, the first detection unit 8 is arranged at the air intake end of the carbon canister 12, and is used to detect the gas temperature at the air intake end of the carbon canister 12, while the second detection unit is used to detect the temperature of the outside air. Among them, the first detection unit 8 and the second detection unit can both use temperature sensors in the prior art. At this time, the controller receives the detection signal of the first detection unit 8, and compares it with the stored preset temperature range to control the opening and closing of the first switch unit 15 or adjust its opening, thereby adjusting the air flow diverted from the air filter 1 to the air intake end of the carbon canister 12, that is, it can adjust the flow of the heated air, and then the air temperature at the air intake end of the carbon canister 12 can be adjusted.

[0051] The second detection unit is set up so that, when in actual use, the controller receives the temperature parameters of the outside air, and combines the received temperature parameters detected by the first detection unit 8 with the stored preset temperature range for logical judgment, so as to more accurately control the opening and closing of the first switch unit 15 and the adjustment of its opening degree, thereby more accurately controlling the temperature of the mixed air in the carbon canister intake pipe 9 within the preset temperature range.

[0052] In this embodiment, in order to have a better desorption efficiency, as Figure 1As shown in , the air inlet end of the carbon canister 12 is provided with a carbon canister air inlet pipe 9, and the carbon canister air inlet pipe 9 is connected to the carbon canister 12. In addition, the above-mentioned bypass pipe 14 is also connected to the carbon canister air inlet pipe 9, and a second switch unit 10 is provided on the carbon canister air inlet pipe 9. The second switch unit 10 is connected to the controller signal and is used to control the on-off between the carbon canister air inlet pipe 9 and the outside world. With such a configuration, the outside air and the heated air in the bypass pipe 14 can be better mixed in the carbon canister air inlet pipe 9, the temperature uniformity of the air entering the carbon canister 12 can be improved, and the desorption efficiency can be improved. At the same time, in addition to being able to use the air in the bypass pipe 14 to desorb the carbon canister 12, it can also have two other desorption modes.

[0053] One is the traditional desorption mode, that is, the first switch part 15 is closed, and the second switch part 10 is opened, and the carbon canister 12 is desorbed only by the outside air entering the carbon canister 12 through the carbon canister intake pipe 9. Another mode is to open the first switch part 15 and the second switch part 10 at the same time, so that the outside air is mixed with the air in the bypass pipeline 14 and enters the carbon canister 12, and the carbon canister 12 is desorbed, which can have a better desorption efficiency. It should be noted that in the specific implementation, the second switch part 10 can specifically adopt the existing stop valve or other valves. In addition to the existing three-way pipe structure, the carbon canister intake pipe 9 can also adopt other structures, as long as the structure has a channel and three interfaces connected to the channel, and these three interfaces are respectively connected to the bypass pipeline 14, the carbon canister 12 and the external environment.

[0054] In addition, if Figure 1 As shown in FIG. 1 , a third switch 13 is provided on the connecting pipeline between the carbon canister 12 and the air intake end of the engine 4. The third switch 13 is connected to the controller signal and is used to control the on-off of the connecting pipeline. The third switch 13 can prevent the gas in the carbon canister 12 from entering the engine 4 when the engine 4 is turned off. In addition, in a specific implementation, the third switch 13 can be a conventional solenoid valve in the prior art.

[0055] Based on the above overall description, when the engine 4 is turned off, the fuel vapor enters the carbon canister 12 through the pipeline and is adsorbed and stored in the carbon canister 12. When the engine 4 is started, there are three working modes, namely, the traditional desorption mode, the split desorption mode and the high-efficiency desorption mode. Figure 2As shown in , in the conventional desorption mode, the second switch unit 10 and the third switch unit 13 are turned on, and the fuel vapor adsorbed in the carbon canister 12 is brought into the engine 4 by clean air to participate in combustion under the vacuum of the pipeline. The working process is outside → second switch unit 10 → carbon canister intake pipe 9 → carbon canister 12 → third switch unit 13 → engine 4. That is, the outside air enters the carbon canister 12 through the second switch unit 10 and the carbon canister intake pipe 9, thereby outputting the fuel vapor adsorbed on the carbon canister 12 to the engine 4 to participate in combustion, thereby achieving desorption.

[0056] like Figure 3 As shown in , in the split desorption mode, the first switch unit 15 and the third switch unit 13 are turned on, and the fuel vapor adsorbed in the carbon canister 12 is brought into the engine 4 by clean air to participate in combustion under the vacuum of the pipeline. The working process is air filter 1→first switch unit 15→carbon canister intake pipe 9→carbon canister 12→third switch unit 13→engine 4. That is, the air split out of the air filter 1 passes through the second switch unit 10, is heated by the heat pipe 7, and then enters the carbon canister 12 through the carbon canister intake pipe 9, thereby outputting the fuel vapor adsorbed on the carbon canister 12 to the engine 4 to participate in combustion, thereby achieving desorption.

[0057] like Figure 4 As shown in , in the high-efficiency desorption mode, the first switch unit 15, the second switch unit 10 and the third switch unit 13 are all turned on. By introducing the hot air in the shunt pipeline 14, the air shunted by the air filter 1 is heated by the heat pipe 7, introduced into the carbon canister intake pipe 9, and mixed with the air entering through the second switch unit 10, so as to achieve mixed heating of the air in the carbon canister intake pipe 9, and the heated air enters the carbon canister 12, so that the fuel vapor adsorbed by the carbon canister 12 enters the engine 4 through the third switch unit 13 to participate in combustion, thereby achieving desorption of the carbon canister 12.

[0058] Moreover, in specific applications, the desorption temperature working range of the carbon canister 12 can be set to T, and the temperature range can be defined to be higher than the maximum temperature of the external environment. The external environment temperature is then monitored by the second detection unit, and a logical judgment is made with the desorption temperature working range T of the carbon canister 12. If T1 is within the desorption temperature working range T, the traditional desorption mode is used directly. If T1 is less than the desorption temperature working range T, the high-efficiency desorption mode is used, and the temperature T2 of the first detection unit 8 is monitored to ensure that it is always within the desorption temperature range T of the carbon canister 12. Furthermore, the amount of hot air in the bypass pipeline 14 can be controlled by controlling the opening of the first switch unit 15 through the controller, so that the air in the carbon canister intake pipe 9 is within the desorption temperature working range T.

[0059] A carbon canister desorption system of this embodiment, by using a heat pipe 7 to transfer the heat of the exhaust pipeline to the air diverted from the air filter 1, can heat the air to form high-temperature air, and mix it with the outside air entering the carbon canister intake pipe 9, thereby achieving mixed heating, which can provide the required heat and flow for the desorption of the carbon canister 12, and can effectively improve the desorption efficiency of the carbon canister 12, which is conducive to meeting the requirements of fuel emission regulations and avoiding the occurrence of excessive emissions due to excessive fuel vapor load. Moreover, the setting of the first detection unit 8 and the second detection unit can select a suitable desorption mode after logical judgment by the controller.

[0060] In addition, the present embodiment also relates to a vehicle, which is provided with a carbon canister desorption system as described above.

[0061] The vehicle of this embodiment has all the beneficial effects of the carbon canister desorption system of the above-mentioned vehicle, which will not be described in detail here.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon canister desorption system, Features: It comprises an air filter (1), a carbon canister (12) and a heat transfer unit; The air filter (1) is arranged on the air intake pipeline of the engine (4), and the carbon canister (12) is connected between the air intake end of the engine (4) and the fuel tank (11); The heat transfer unit comprises a shunt pipeline (14) and a heat transfer device, wherein the shunt pipeline (14) is connected between an air outlet end of the air filter (1) and an air inlet end of the carbon canister (12), and the heat transfer device is connected between the shunt pipeline (14) and an exhaust pipeline of the engine (4) to transfer heat from the gas in the exhaust pipeline to the shunt pipeline (14).

2. A carbon canister desorption system according to claim 1, Features: The diversion pipeline (14) is provided with a first switch portion (15); The first switch unit (15) is connected to a controller signal and is used to control the on and off of the shunt pipeline (14).

3. A carbon canister desorption system according to claim 1, Features: It also includes a first detection unit (8) and a second detection unit connected to the controller signal; The first detection part (8) is arranged at the air intake end of the carbon canister (12) and is used to detect the gas temperature at the air intake end of the carbon canister (12), and the second detection part is used to detect the temperature of the outside air.

4. A carbon canister desorption system according to claim 1, Features: The air inlet end of the carbon canister (12) is provided with a carbon canister air inlet pipe (9), and the diversion pipeline (14) is in communication with the carbon canister air inlet pipe (9); The carbon canister air intake pipe (9) is provided with a second switch unit (10), the second switch unit (10) is connected to a controller signal and is used to control the on / off connection between the carbon canister air intake pipe (9) and the outside world.

5. A carbon canister desorption system according to claim 1, Features: A third switch unit (13) is provided on the connecting pipeline between the carbon canister (12) and the air intake end of the engine (4); The third switch unit (13) is connected to the controller signal and is used to control the on and off of the connecting pipeline.

6. A carbon canister desorption system according to claim 1, Features: The heat conduction device adopts a heat pipe (7).

7. A carbon canister desorption system according to claim 1, Features: The exhaust pipeline is provided with a post-processor (5) and a muffler (6) which are arranged in sequence along the exhaust path; One end of the heat conduction device is arranged on the pipeline between the post-processor (5) and the muffler (6), and the other end is arranged on the diversion pipeline (14).

8. A carbon canister desorption system according to any one of claims 1 to 7, Features: Also includes a turbocharger (3) and an intercooler (2); The compression wheel (301) of the turbocharger (3) is arranged on the intake pipe, the intercooler (2) is arranged between the compression wheel (301) and the intake end of the engine (4), and the turbine (302) of the turbocharger (3) is arranged on the exhaust pipe.

9. A vehicle, Features: The vehicle is provided with a carbon canister desorption system according to any one of claims 1 to 8.

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