Hybrid vehicle gaseous fuel evaporation condensation recovery system and control method

Abstract

The application discloses a gaseous fuel evaporation condensation recovery system and control method for a hybrid electric vehicle. The system comprises an oil tank, an activated carbon tank, a gas pressure pump, a condensing device, a plurality of electrically-controlled two-way valves and a plurality of electrically-controlled three-way valves. A first upper connecting pipe at the upper end of the condensing pipe is connected to the gas pressure pump, a first electrically-controlled three-way valve and an engine intake manifold in sequence. The activated carbon tank comprises a main carbon cavity and an auxiliary carbon cavity. A bypass pipe is connected to the upper side of the oil tank through a pressure relief valve, and a condensing container bottom is connected to the upper side of the oil tank through an oil return valve. A second upper connecting pipe is connected to the main carbon cavity through a second electrically-controlled three-way valve, a main carbon cavity electrically-controlled two-way valve and the main carbon cavity in sequence, and is connected to the auxiliary carbon cavity through a third electrically-controlled three-way valve, an auxiliary carbon cavity electrically-controlled two-way valve and the auxiliary carbon cavity in sequence. A refrigerator output end is connected to the lower part of the condensing container. The control method comprises A pressure relief, B desorption and C pressure relief and desorption. The application improves the condensation efficiency, reduces the loss of refrigeration energy and achieves the purpose of saving resources and protecting the atmospheric environment.

Description

TECHNICAL FIELD

[0001] The application relates to a hybrid electric vehicle, in particular to a gaseous fuel recovery system and control method of an oil-electric hybrid electric vehicle, and belongs to the technical field of automobile environmental protection. BACKGROUND

[0002] New energy vehicles mainly include hybrid electric vehicles (HEV / PHEV), pure electric vehicles (BEV) and solar vehicles. As a product for solving environmental pollution and energy shortage, compared with traditional vehicles, the fuel consumption and emission pollutants of the hybrid electric vehicle are greatly reduced, but the problem of fuel evaporation emission is still prominent. The oil-electric hybrid electric vehicle relies on the motor for a long time, and a large amount of fuel vapor in the fuel tank flows into the activated carbon canister, causing the activated carbon canister to be easily saturated, and the fuel gas that is not absorbed by the activated carbon canister is directly discharged into the atmosphere. In addition, during refueling, the fuel vapor will break through the activated carbon canister due to the change of the gas phase space, causing environmental pollution and energy waste. The “Light-duty Vehicle Emission Limit and Measurement Method (China Phase VI)” issued in 2016 puts forward higher requirements for automobile fuel evaporation control technology. Therefore, developing a gaseous fuel recovery system and control method for an oil-electric hybrid electric vehicle is an important task facing the automobile industry.

[0003] Chinese patent CN111336040B discloses a gaseous fuel recovery system and control method for a hybrid electric vehicle, which uses a semiconductor refrigerator to condense fuel vapor and promote the condensation of fuel vapor into liquid fuel, but the semiconductor refrigerator needs to work for a long time and consumes a large amount of electric energy, and the refrigeration efficiency is low, which cannot achieve ideal condensation recovery efficiency.

[0004] Chinese patent CN109899184A discloses a gaseous fuel evaporation recovery device and control method for an automobile, which uses at least two groups of adsorption components connected in parallel to adsorb fuel vapor, and determines the adsorption and desorption of a single activated carbon canister through a carbon-hydrogen sensor, but this scheme needs to increase the number of activated carbon cans, which occupies a large space and is not conducive to practical application. SUMMARY

[0005] The application aims to provide a gaseous fuel evaporation condensation recovery system and control method for an oil-electric hybrid electric vehicle, which effectively solves the problems of long-time operation of the refrigeration equipment of the oil-electric hybrid electric vehicle, large energy consumption, and low liquefaction efficiency of the fuel gas.

[0006] The application is implemented through the following technical solutions:

[0007] The application discloses a gaseous fuel evaporation condensation recovery system for a hybrid vehicle, which comprises an oil tank, an activated carbon tank, a gas pressure pump, a condensation device, a plurality of electrically-controlled two-way valves and a plurality of electrically-controlled three-way valves, wherein the condensation device comprises a condensation container, a refrigerator, a cold quantity control valve and a controller, and a pressure sensor is arranged in the oil tank; the upright condensation container comprises a double-layer shell and a condensation pipe, the spiral condensation pipe is arranged in the upper portion of the condensation container, condensation filling particles are filled in the upper portion of the condensation container and surround the condensation pipe, and the upper end of the double-layer shell is connected with the atmosphere through an electrically-controlled atmosphere valve; the upper end of the condensation pipe is connected with the gas pressure pump, the first electrically-controlled three-way valve and the engine intake manifold through a first upper connecting pipe in sequence after extending out of the double-layer shell, and the lower end of the condensation pipe is open; the activated carbon tank comprises two independent chambers, i.e., a main carbon cavity and an auxiliary carbon cavity, and the volume of the main carbon cavity is greater than that of the auxiliary carbon cavity; the bypass pipe at the upper end of the condensation pipe is connected with the upper side of the oil tank through a pressure relief valve, and the bottom connecting pipe of the condensation container is connected with the upper side of the oil tank through an oil liquid return valve; the second upper connecting pipe at the top of the condensation container is divided into two paths, one of which is connected with the main carbon cavity through a second electrically-controlled three-way valve, an electrically-controlled two-way valve of the main carbon cavity and the main carbon cavity in sequence, and the other of which is connected with the auxiliary carbon cavity through a third electrically-controlled three-way valve, an electrically-controlled two-way valve of the auxiliary carbon cavity and the auxiliary carbon cavity in sequence; the first electrically-controlled three-way valve is connected with the second electrically-controlled three-way valve through a connecting pipe; the output pipe of an air filter is divided into two paths, one of which leads to the main carbon cavity, and the other of which leads to the auxiliary carbon cavity through a fourth electrically-controlled three-way valve; the output end of the refrigerator is connected with the lower portion of the condensation container through a cold quantity adjusting valve; and the controller is electrically connected with each electrically-controlled two-way valve, each electrically-controlled three-way valve, the control end of the gas pressure pump, each pressure sensor and each temperature sensor.

[0008] The object of the application can also be further achieved by the following technical measures.

[0009] Further, the upper portion of the double-layer shell is a frustum shell, the lower portion is a hemispherical shell, a plurality of horizontal perforated partitions are arranged at the joint of the frustum shell and the hemispherical shell, the distance H between the end face of the horizontal perforated partition and the lower end of the condensation pipe is 2-3 cm, a vacuum heat insulation plate is fixedly arranged on the inner side of the outer shell of the double-layer shell, 15% NaCl solution is injected between the outer shell and the inner shell as a phase change material, the hemispherical shell is used as a condensation liquid fuel collecting cavity, a liquid level sensor is arranged in the lower portion of the hemispherical shell, and a first temperature sensor and a second temperature sensor are arranged in the frustum shell in a diagonal manner.

[0010] Further, a plurality of main carbon cavity horizontal perforated vertical partitions are arranged in the main carbon cavity in a spaced manner, the auxiliary carbon cavity is arranged in a corner of the activated carbon tank, the volume ratio of the main carbon cavity to the auxiliary carbon cavity is 4:1, a first carbon hydrogen sensor is arranged in the lower portion of the auxiliary carbon cavity, and a second carbon hydrogen sensor is arranged in the lower portion of the main carbon cavity.

[0011] Further, the horizontal perforated partition is provided with a plurality of horizontal through holes with a diameter of 1.4-1.6 mm, and the horizontal perforated vertical partition is provided with a plurality of vertical through holes with a diameter of 1.8-2.2 mm.

[0012] Furthermore, a horizontal partition is provided in the middle of the auxiliary carbon chamber in the vertical direction, and the distance between the outer end of the horizontal partition and the wall of the auxiliary carbon chamber is H1 = 1.8~2.2 mm;

[0013] Furthermore, the material of the condensation filling particles is copper or aluminum.

[0014] A control method for a gaseous fuel evaporation-condensation recovery system in a hybrid electric vehicle includes the following steps for different operating conditions:

[0015] First, preset the following parameters in the controller: maximum oil tank pressure P high and the minimum pressure P of the fuel tank low The highest temperature of the condenser container is T. hig and the lowest temperature T of the condenser low Then proceed according to the corresponding steps for different working conditions: A. depressurization, B. desorption, and C. simultaneous depressurization and desorption.

[0016] A pressure relief

[0017] A1) The pressure sensor inside the fuel tank detected that the fuel tank pressure was higher than the maximum fuel tank pressure P. high When the controller commands the pressure relief valve, the refrigeration unit and the electrically controlled atmospheric valve to open, the gaseous fuel in the tank enters the condenser tube of the condenser container in sequence through the pressure relief valve, the bypass pipe and the first upper connecting pipe. The condensed liquid fuel flows out from the lower end of the condenser tube and flows through the porous horizontal baffle into the liquid collection chamber at the lower end of the condenser container.

[0018] A2) The controller command opens the corresponding port of the second electronically controlled three-way valve and the main carbon chamber electronically controlled two-way valve. The gaseous fuel that has not been condensed in the condensation container enters the main carbon chamber of the activated carbon canister for adsorption in sequence through the second upper connecting pipe, the second electronically controlled three-way valve and the main carbon chamber electronically controlled two-way valve.

[0019] A3) When the pressure sensor detects that the tank pressure is lower than the preset value P low When the pressure relief valve is closed, the temperature of the condenser container is detected by the first and second temperature sensors during the pressure relief process. When the temperature of the condenser container is lower than the minimum temperature T of the condenser container... low When the controller commands the chiller to stop, the electrically controlled atmospheric valve closes; at this time, the phase change material using a 15% NaCl solution provides cooling to the condenser; when the temperature of the condenser exceeds the maximum temperature T of the condenser... high At this time, the controller commands the refrigeration unit and the electrically controlled atmospheric valve to open, and this cycle repeats continuously.

[0020] A4) After the pressure relief valve is closed, the temperature of the condensing container is detected by the first temperature sensor and the second temperature sensor. If the phase change material still has cold energy and the first carbon-hydrogen sensor detects that the auxiliary carbon chamber is in an empty state or a low load state of 10% to 20% volume, the controller instructs to start the air pressure pump and the electrically controlled air valve, and instructs to turn on the corresponding ports of the first electrically controlled three-way valve, the second electrically controlled three-way valve, and the third electrically controlled three-way valve, and the main carbon chamber electrically controlled two-way valve and the auxiliary carbon chamber electrically controlled two-way valve, so that the gaseous fuel in the main carbon chamber after desorption treatment is sequentially adsorbed and condensed in the condensing pipe at the upper part of the condensing container through the main carbon chamber electrically controlled two-way valve, the second electrically controlled three-way valve, the first electrically controlled three-way valve, the air pressure pump, and the first upper connecting pipe, and the condensed liquid fuel flows to the liquid collecting chamber. The gaseous fuel that is not condensed sequentially passes through the second upper connecting pipe, the third electrically controlled three-way valve, and the auxiliary carbon chamber electrically controlled two-way valve to be adsorbed in the auxiliary carbon chamber. When the cold energy of the phase change material is consumed or the phase change material has cold energy and the auxiliary carbon chamber is in an empty state or a low load state of 10% to 20% volume, the pressure relief process ends, and the controller instructs to open the oil liquid backflow valve, so that the liquid fuel in the oil collecting chamber flows back to the oil tank.

[0021] B desorption

[0022] B1) When the second carbon-hydrogen sensor detects that the main carbon chamber is in a saturated state and the first carbon-hydrogen sensor detects that the auxiliary carbon chamber is in an empty state or a low load state of 10% to 20% volume at the same time, the controller instructs to open the air pressure pump, the refrigerator, and the electrically controlled air valve, and repeats step A2) to complete the adsorption of the gaseous fuel into the main carbon chamber.

[0023] B2) The process after detecting the temperature of the condensing container by the first temperature sensor and the second temperature sensor in step A3) is repeated. When the adsorption amount of fuel in the main carbon chamber reaches 75%, the controller instructs the refrigerator to stop and the electrically controlled air valve to be closed. The temperature of the condensing container is detected by the first temperature sensor and the second temperature sensor to determine whether the phase change material still has cold energy. If the phase change material still has cold energy, the process of step A2) is repeated to continue the adsorption of gaseous fuel into the main carbon chamber. Until the cold energy of the phase change material is released, if it is determined that the phase change material has no cold energy, the entire desorption and condensation process ends. The controller instructs to open the oil liquid backflow valve, and the liquid fuel in the oil collecting chamber at the lower part of the condensing container flows back to the oil tank.

[0024] B3) When the first hydrocarbon sensor and the second hydrocarbon sensor detect that the main carbon cavity and the auxiliary carbon cavity are both saturated, at this time the engine is started, and the controller instructs to open each electrically controlled three-way valve, the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, air filtered through the air filter is introduced into the main carbon cavity and the auxiliary carbon cavity through the engine intake manifold vacuum, and is introduced into the auxiliary carbon cavity through the fourth electrically controlled three-way valve, the gaseous fuel in the main carbon cavity and the auxiliary carbon cavity is flushed and desorbed, and then is introduced into the engine through the engine intake manifold through the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, the third electrically controlled three-way valve, the second electrically controlled three-way valve and the first electrically controlled three-way valve in turn;

[0025] C desorbing while depressurizing

[0026] C1) When the engine is working, the step process of A1) is repeated to depressurize, and the controller instructs to open each electrically controlled three-way valve, the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, air filtered through the air filter is introduced into the main carbon cavity and the auxiliary carbon cavity through the engine intake manifold vacuum, the gaseous fuel in the main carbon cavity and the auxiliary carbon cavity is flushed and desorbed, and then the gaseous fuel in the main carbon cavity is introduced into the engine through the engine intake manifold through the main carbon cavity electrically controlled two-way valve, the second electrically controlled three-way valve and the first electrically controlled three-way valve in turn; the gaseous fuel in the auxiliary carbon cavity is introduced into the engine through the engine intake manifold through the auxiliary carbon cavity electrically controlled two-way valve, the third electrically controlled three-way valve and the gaseous fuel in the main carbon cavity in one way; the gaseous fuel not condensed in the condensing container is introduced into the auxiliary carbon cavity for adsorption through the second upper connecting pipe and the third electrically controlled three-way valve in turn;

[0027] C2) The temperature of the condensing container is detected through the first temperature sensor and the second temperature sensor, when the temperature value is lower than the minimum temperature T low of the condensing container, the controller instructs the freezer to stop and the electrically controlled atmospheric valve to be closed; at this time, the phase change material provides cold energy for the condensing container; when the temperature is higher than the maximum temperature T high of the condensing container, the controller instructs the freezer to start and the electrically controlled atmospheric valve to be opened, and the cycle is repeated;

[0028] C3) When the adsorption amount of the main carbon cavity is less than 20% of the maximum adsorption amount of the main carbon cavity, the controller instructs the freezer to stop, the electric control through air valve is closed, and the engine also stops working, and the automobile is converted into motor drive; at this time, the temperature of the condensing container is detected through the first temperature sensor and the second temperature sensor, and if the controller determines that the phase change material still has cold energy, the controller instructs the opening of the air pressure pump, the freezer and the electric control through air valve, and the gaseous fuel in the condensing container enters the secondary carbon cavity for adsorption through the second upper connecting pipe, the corresponding port of the third electric control three-way valve, the secondary carbon cavity electric control two-way valve in turn; the gaseous fuel adsorbed in the main carbon cavity enters the condensing container through the main carbon cavity electric control two-way valve, the corresponding port of the second electric control three-way valve, the corresponding port of the first electric control three-way valve, the air pressure pump and the first upper connecting pipe in turn, and is condensed into liquid fuel, until the cold energy of the condensing container is released, and if the cold energy release of the phase change material in the double-layer shell of the condensing container is completed, the pressure relief desorption process is completed, and the controller instructs the opening of the oil liquid return valve, and the liquid fuel in the lower oil collecting cavity of the condensing container flows back to the oil tank.

[0029] The condensing container of the present application adopts a double-layer shell filled with 15% NaCl solution as phase change material, and the condensing filling particles are filled in the upper part of the condensing container and surround the condensing pipe. Through the alternating cooling effect of the phase change material and the freezer, reliable condensation and recovery of the gaseous fuel evaporated from the oil tank are realized, and the problems of high energy consumption and low gaseous fuel liquefaction efficiency of the refrigeration equipment during long-time operation are solved. When the engine is not working, the saturation degree of the activated carbon tank is reduced, thereby reducing the number of forced engine starts due to the saturation of the activated carbon tank and the working time of the engine. The activated carbon tank adopts a structure of two cavities that are not communicated and have different volumes, the adsorption port and the desorption port of the main carbon cavity or the secondary carbon cavity are combined into one, and the air pressure pump is connected in parallel at the oil tank pressure relief pipeline. When the engine is not working, the saturation degree of the activated carbon tank is reduced, the service life of the activated carbon tank is prolonged, the number of forced engine starts due to the saturation of the activated carbon tank is reduced, and the working time of the engine is shortened. The gaseous fuel evaporated from the oil tank flows between the closed condensing container and the activated carbon tank through the pipeline and the electric control valves and the air pressure pump without escaping. The control method of the present application adopts three different working conditions of pressure relief, desorption and pressure relief and desorption, improves the condensation efficiency, reduces the loss of refrigeration energy, and achieves the purpose of saving resources and protecting the atmospheric environment.

[0030] The advantages and characteristics of the present application will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the gaseous fuel recovery system of the present application;

[0032] Figure 2 is an enlarged view of part I of Figure 1 ​

[0033] Figure 3 is Figure 1 a II part enlarged view of

[0034] Figure 4 is a gaseous fuel, cold, liquid fuel, air flow schematic diagram of steps A1) ~ A3) in the pressure relief process of the present application;

[0035] Figure 5 is a gaseous fuel, cold, liquid fuel, air flow schematic diagram of step A4) in the pressure relief process of the present application;

[0036] Figure 6 is a gaseous fuel, cold, liquid fuel, air flow schematic diagram of steps B1) ~ B3) in the desorption process of the present application;

[0037] Figure 7 is a gaseous fuel, cold, liquid fuel, air flow schematic diagram of steps C1) ~ C3) in the pressure relief and desorption process of the present application. DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with the drawings and examples.

[0039] In the description of the present application, the terms indicating the orientation or positional relationship such as "up", "down", "left", "right", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device must have a particular orientation.

[0040] As Figures 1-3 shown, the present embodiment includes an oil tank 1, an activated carbon tank 2, a gas pressure pump 3, a condensing device 4, several electrically controlled two-way valves and four electrically controlled three-way valves, the condensing device 4 including a condensing container 41, a refrigerator 43 and a cold control valve 431 (electrically controlled two-way valve) and a controller 44.

[0041] The oil tank 1 is provided with a pressure sensor 11, and the upright condensing container 41 includes a double-layer shell 411 and a condensing pipe 412, the spiral condensing pipe 412 being located in the upper part of the condensing container 41, and the condensing filling particles 413 being filled in the upper part of the condensing container 41 and surrounding the periphery of the condensing pipe 412, which is made of copper or aluminum and has good cold conducting function. The upper end of the double-layer shell 411 is communicated with the atmosphere through an electrically controlled atmospheric valve 414 (electrically controlled two-way valve). The upper end of the condensing pipe 412 extends out of the double-layer shell 411 and is connected with the gas pressure pump 3, the first electrically controlled three-way valve 5 and the engine intake manifold 101 in sequence through the first upper connecting pipe 415, and the lower end of the condensing pipe 412 is open.

[0042] The active carbon tank 2 comprises two independent chambers, a main carbon chamber 21 and a secondary carbon chamber 22, the volume of the main carbon chamber 21 being greater than that of the secondary carbon chamber 22; the bypass pipe 416 at the upper end of the condensing pipe 412 is connected to the upper side of the oil tank 1 through a pressure relief valve 417 (an electrically controlled two-way valve), and the bottom connecting pipe 418 of the condensing container 41 is connected to the upper side of the oil tank 1 through an oil return valve 419 (an electrically controlled two-way valve).

[0043] The second upper connecting pipe 420 at the top end of the condensing container 41 is divided into two paths, one of which is connected to the main carbon chamber 21 of the active carbon tank 2 in sequence through a second electrically controlled three-way valve 6 and a main carbon chamber electrically controlled two-way valve 211, and the other of which is connected to the secondary carbon chamber 22 in sequence through a third electrically controlled three-way valve 7 and a secondary carbon chamber electrically controlled two-way valve 42. The first electrically controlled three-way valve 5 is connected to the second electrically controlled three-way valve 6 through a connecting pipe 61. The output pipe 91 of the air filter 9 is divided into two paths, one of which leads to the main carbon chamber 21, and the other of which leads to the secondary carbon chamber 22 through a fourth electrically controlled three-way valve 8. The output end of the refrigerator 43 is connected to the lower part of the condensing container 41 through a cold quantity regulating valve 431 (an electrically controlled two-way valve), and the controller 44 is electrically connected to each electrically controlled two-way valve, each electrically controlled three-way valve, the control end of the air pressure pump 3, each pressure sensor, and each temperature sensor.

[0044] The upper part of the double-layer shell 411 is a frustoconical shell 421, and the lower part is a hemispherical shell 422. A porous horizontal partition plate 423 is arranged at the connection between the frustoconical shell 421 and the hemispherical shell 422. The lower end port of the condensing pipe 412 is located at a distance H = 2-3 cm from the end face of the porous horizontal partition plate 423, so that the condensed liquid fuel can flow into the liquid collection chamber at the lower end of the condensing container 41 through the porous horizontal partition plate 423. A layer of vacuum heat insulation plate 4113 is fixedly arranged on the inner side of the outer shell 4111 of the double-layer shell 411, and the heat insulation is achieved by the internal vacuum resistance convection of the vacuum material. A 15% NaCl solution 4114 is injected between the outer shell 4111 and the inner shell 4112 as a phase change material. The hemispherical shell 422 serves as a liquid fuel collection chamber, a liquid level sensor 424 is arranged in the lower part of the hemispherical shell 422, and a first temperature sensor 425 and a second temperature sensor 426 are arranged diagonally above and below in the frustoconical shell 421. The porous horizontal partition plate 423 of the present embodiment is provided with a plurality of horizontal through holes 4231 with a diameter of 1.5 mm.

[0045] The main carbon cavity 21 is provided with three porous vertical partitions 212 arranged at intervals, which divide the main carbon cavity 21 into four communicating chambers. The porous vertical partitions 212 of the embodiment are provided with a plurality of vertical through holes 2121 with a diameter of 2.0 mm. The main carbon cavity 21 adopts a multi-chamber structure, which prolongs the flow path of gaseous fuel in the main carbon cavity 21, so as to achieve better adsorption effect. The auxiliary carbon cavity 22 is located in the lower left corner of the activated carbon tank 2. A horizontal partition 221 is arranged in the vertical middle part of the auxiliary carbon cavity 22. The outer end of the horizontal partition 221 of the embodiment is spaced apart from the cavity wall of the auxiliary carbon cavity 22 by a distance H1 of 2.0 mm, which is also to prolong the flow path of gaseous fuel in the auxiliary carbon cavity 22. The volume ratio of the main carbon cavity 21 to the auxiliary carbon cavity 22 is 4:1. The first carbon hydrogen sensor 23 is arranged in the lower left corner of the auxiliary carbon cavity 22, and the second carbon hydrogen sensor 24 is arranged in the lower right corner of the main carbon cavity 22.

[0046] A control method of a gaseous fuel evaporation and condensation recovery system of a hybrid electric vehicle, comprising the following corresponding steps of different working conditions:

[0047] First, the following parameters are preset in the controller respectively: the maximum pressure P high of the oil tank, the minimum pressure P low of the oil tank, the maximum temperature T hig of the condenser, and the minimum temperature T low of the condenser. Then, the corresponding steps of different working conditions of A pressure relief, B desorption, and C pressure relief and desorption at the same time are performed respectively.

[0048] A pressure relief

[0049] As shown in FIG. Figure 4 , when the pressure sensor 11 in the oil tank 1 detects that the pressure of the oil tank is higher than the maximum pressure P high of the oil tank, the controller 4 instructs to open the pressure relief valve 417, the refrigerator 43, and the electrically controlled atmospheric valve 414. The gaseous fuel in the oil tank 1 flows into the condensing pipe 412 of the condenser 41 through the pressure relief valve 417, the bypass pipe 416, and the first upper connecting pipe 415 in the direction indicated by the arrow in sequence. The condensed liquid fuel flows out from the lower end port of the condensing pipe 412, passes through the porous horizontal partition 423, and flows into the liquid collection cavity at the lower end of the condenser 41.

[0050] A2) The controller 4 instructs to turn on the first end 611 of the second electrically controlled three-way valve and the third end 612 of the second electrically controlled three-way valve, and the main carbon cavity electrically controlled two-way valve 211. The gaseous fuel in the condenser 4 that is not condensed flows into the main carbon cavity 21 of the activated carbon tank 2 through the second upper connecting pipe 420, the second electrically controlled three-way valve 6, and the main carbon cavity electrically controlled two-way valve 211 in sequence for adsorption.

[0051] A3) When the pressure sensor 11 detects that the pressure of the oil tank 1 is lower than the preset value P lowWhen the pressure is released, the pressure relief valve 417 closes. During the pressure relief process, the temperature of the condenser container 4 is detected by the first temperature sensor 425 and the second temperature sensor 426. When the temperature of the condenser container 4 is lower than the minimum temperature T of the condenser container... low When the controller 44 commands the chiller 43 to stop, the electrically controlled atmospheric valve 414 closes. At this time, the phase change material 4113, using a 15% NaCl solution, provides cooling to the condenser 4. When the temperature of the condenser 4 exceeds the maximum temperature T of the condenser... high At this time, the controller 44 commands the refrigeration unit 43 and the electrically controlled atmospheric valve 414 to open, and this cycle repeats.

[0052] A4) As Figure 5 As shown, after the pressure relief valve 417 is closed, the temperature of the condenser container 4 is detected by the first temperature sensor 425 and the second temperature sensor 426. If the phase change material 4114 still has cooling capacity and the first hydrocarbon sensor 23 detects that the auxiliary carbon chamber 22 is in an unloaded state or a low load state of 10% to 20% of its volume, the controller 44 commands the gas pump 3 and the electrically controlled atmospheric valve 414 to start. At the same time, it commands the second end 512 and the third end 513 of the first electrically controlled three-way valve to be opened, and the second end 6 of the second electrically controlled three-way valve to be opened. 12 and the third terminal 613 of the second and third electrically controlled three-way valves, the second terminal 712 and the third terminal 713 of the third electrically controlled three-way valves, as well as the main carbon chamber electrically controlled two-way valve 211 and the auxiliary carbon chamber electrically controlled two-way valve 42, sequentially pass through the main carbon chamber electrically controlled two-way valve 211, the second electrically controlled three-way valve 6, the first electrically controlled three-way valve 5, the air pressure pump 3 and the first upper connecting pipe 415 into the condenser pipe 412 at the top of the condenser container 4 for adsorption and condensation. The condensed liquid fuel flows to the liquid collection chamber. The uncondensed gaseous fuel sequentially passes through the second upper connecting pipe 420, the third electrically controlled three-way valve 7, and the auxiliary carbon chamber electrically controlled two-way valve 42 into the auxiliary carbon chamber 22 for adsorption. When the cooling capacity of the phase change material 4114 is exhausted, or when the phase change material 4114 has cooling capacity and the auxiliary carbon chamber 22 is in an unloaded or low-load state of 10% to 20% volume, the pressure relief process ends, and the controller 44 commands the oil return valve 419 to open, and the liquid fuel in the oil collection chamber flows back to the oil tank 1.

[0053] B Desorption

[0054] B1) such as Figure 6 As shown, when the second hydrocarbon sensor 24 detects that the main carbon chamber 21 is saturated and the first hydrocarbon sensor 23 detects that the auxiliary carbon chamber 22 is unloaded or at a low load of 10% to 20% of its volume, the controller 44 commands the gas pressure pump 3, the refrigeration unit 43 and the electrically controlled atmospheric valve 414 to be turned on, and step A2) is repeated to complete the adsorption of gaseous fuel entering the main carbon chamber 21.

[0055] B2) Repeat step A3) after detecting the temperature of the condenser container 41 using the first temperature sensor 425 and the second temperature sensor 426. When the fuel adsorption amount in the main carbon chamber 21 reaches 75%, the controller 44 commands the refrigeration unit 43 to stop, and the electrically controlled atmospheric valve 431 closes. The temperature of the condenser container 41 is detected by the first temperature sensor 425 and the second temperature sensor 426 to determine whether the phase change material 4114 still has cooling capacity. If it still has cooling capacity, step A2) is repeated to continue adsorbing the gaseous fuel entering the main carbon chamber 41. This continues until the cooling capacity of the phase change material 4114 is completely released. If it is determined that the phase change material 4114 has no cooling capacity, the entire desorption and condensation process ends. The controller 44 commands the oil return valve 419 to open, and the liquid fuel in the lower oil collection chamber of the condenser container 41 flows back to the oil tank 1.

[0056] B3) When the first hydrocarbon sensor 23 and the second hydrocarbon sensor 24 detect that both the main carbon chamber 21 and the auxiliary carbon chamber 22 are saturated, the engine 10 is started. At the same time, the controller 44 commands the opening of each electronically controlled three-way valve, the main carbon chamber electronically controlled two-way valve 211 and the auxiliary carbon chamber electronically controlled two-way valve 42. The vacuum of the engine intake manifold 101 causes air to be filtered by the air filter 9 and enter the main carbon chamber 21 through the output pipe 91. It also enters the auxiliary carbon chamber 22 through the third end 813 and the first end 811 of the fourth electronically controlled three-way valve, flushing and desorbing the gaseous fuel in the main carbon chamber 21 and the auxiliary carbon chamber 22. Then, it passes through the corresponding ports of the main carbon chamber electronically controlled two-way valve 211 and the auxiliary carbon chamber electronically controlled two-way valve 42, and then through the corresponding ports of the third electronically controlled three-way valve 7, the second electronically controlled three-way valve 6 and the first electronically controlled three-way valve 5, and finally enters the engine 10 through the engine intake manifold 101.

[0057] C depressurizes while desorbing

[0058] C1) such as Figure 7 As shown, when engine 10 is operating, the depressurization process in step A1) is repeated. Simultaneously, controller 44 instructs the opening of each electronically controlled three-way valve, the main carbon chamber electronically controlled two-way valve 211, and the auxiliary carbon chamber electronically controlled two-way valve 42. Utilizing the vacuum in the engine intake manifold 101, air is filtered by air filter 9 and enters the main carbon chamber 21 and auxiliary carbon chamber 22 respectively, flushing and desorbing the gaseous fuel in the main carbon chamber 21 and auxiliary carbon chamber 22. Then, the gaseous fuel in the main carbon chamber 21 sequentially passes through the corresponding ports of the main carbon chamber electronically controlled two-way valve 211, the second electronically controlled three-way valve 6, and the first electronically controlled three-way valve 5, and then enters engine 10 through engine intake manifold 101. The gaseous fuel in the auxiliary carbon chamber 22 sequentially passes through the auxiliary carbon chamber electronically controlled two-way valve 42, the third electronically controlled three-way valve 7, and the gaseous fuel in the main carbon chamber 21, merging into a single path that enters engine 10 through engine intake manifold 101. Uncondensed gaseous fuel oil in the condensation container 41 enters the auxiliary carbon chamber 22 for adsorption through the second upper connecting pipe 420 and the corresponding port of the third electronically controlled three-way valve 7.

[0059] C2) When the temperature of the condensing container 41 is lower than the minimum temperature T low of the condensing container, the controller 44 instructs the refrigerator 43 to stop and the electrically controlled atmospheric valve 414 to close. At this time, the phase change material 4114 provides cold energy for the condensing container 41. When the temperature is higher than the maximum temperature T high of the condensing container, the controller 44 instructs the refrigerator 43 to start and the electrically controlled atmospheric valve 414 to open, and the cycle is repeated.

[0060] C3) When the adsorption amount of the main carbon cavity is less than 20% of the maximum adsorption amount of the main carbon cavity, the controller 44 instructs the refrigerator 43 to stop, the electrically controlled atmospheric valve 414 to close, and the engine 10 to stop working, and the vehicle is switched to electric drive. At this time, the temperature of the condensing container 41 is detected by the first temperature sensor 425 and the second temperature sensor 426. If the controller 44 determines that the phase change material 4114 still has cold energy, the controller 44 instructs the opening of the gas pressure pump 3, the refrigerator 43, and the electrically controlled atmospheric valve 414. The gaseous fuel in the condensing container 41 enters the secondary carbon cavity 22 for adsorption in sequence through the second upper connecting pipe 420, the corresponding port of the third electrically controlled three-way valve 7, and the secondary carbon cavity electrically controlled two-way valve 42. The gaseous fuel in the main carbon cavity 21 after adsorption treatment enters the condensing container 41 in sequence through the main carbon cavity electrically controlled two-way valve 211, the corresponding port of the second electrically controlled three-way valve 6, the corresponding port of the first electrically controlled three-way valve 5, the gas pressure pump 3, and the first upper connecting pipe 415, and is condensed into liquid fuel. When the cold energy of the phase change material 4114 in the double-layer shell 411 of the condensing container 41 is released, the pressure relief desorption process is completed, and the controller 44 instructs the opening of the oil liquid return valve 419. The liquid fuel in the lower oil collecting cavity of the condensing container flows back to the oil tank 1.

[0061] In addition to the above embodiments, the present application can have other implementation manners, and any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope of the present application.

Claims

1. A gaseous fuel evaporation condensation recovery system for a hybrid vehicle, comprising a fuel tank, an activated carbon tank, a gas pressure pump and a controller, wherein a pressure sensor is arranged in the fuel tank. The application also comprises a condensing device, several electrically controlled two-way valves and several electrically controlled three-way valves, the condensing device comprises a condensing container, a refrigerator and a cold control valve, the upright condensing container comprises a double-layer shell and a condensing pipe, the spiral condensing pipe is located in the upper part of the condensing container, the condensing filling particles are filled in the upper part of the condensing container and surround the condensing pipe, the upper end of the double-layer shell is communicated with the atmosphere through an electrically controlled atmospheric valve; the upper end of the condensing pipe extends out of the double-layer shell and is connected with a gas pressure pump, a first electrically controlled three-way valve and an engine intake manifold in sequence through a first upper connecting pipe, and the lower end of the condensing pipe is open; the activated carbon tank comprises two independent chambers, i.e., a main carbon chamber and an auxiliary carbon chamber, and the volume of the main carbon chamber is greater than that of the auxiliary carbon chamber; a bypass pipe at the upper end of the condensing pipe is connected with the upper side of an oil tank through a pressure relief valve, and a bottom connecting pipe of the condensing container is connected with the upper side of the oil tank through an oil return valve; a second upper connecting pipe at the top of the condensing container is divided into two paths, one of which is connected with the main carbon chamber in sequence through a second electrically controlled three-way valve and a main carbon chamber electrically controlled two-way valve, and the other of which is connected with the auxiliary carbon chamber in sequence through a third electrically controlled three-way valve and an auxiliary carbon chamber electrically controlled two-way valve; the first electrically controlled three-way valve and the second electrically controlled three-way valve are connected through a connecting pipe; the output pipe of an air filter is divided into two paths, one of which leads to the main carbon chamber, and the other of which leads to the auxiliary carbon chamber through a fourth electrically controlled three-way valve; the output end of the refrigerator is connected with the lower part of the condensing container through a cold control valve; a controller is electrically connected with each electrically controlled two-way valve, each electrically controlled three-way valve, the control end of the gas pressure pump, each pressure sensor and each temperature sensor; The upper part of the double-layer shell is a conical shell, the lower part is a hemispherical shell, a multi-hole horizontal partition is arranged at the joint of the conical shell and the hemispherical shell, the distance H between the end face of the multi-hole horizontal partition and the lower end of the condensing pipe is 2-3 cm; a vacuum heat insulation plate is fixedly arranged on the inner side of the outer shell of the double-layer shell, and 15% NaCl solution is injected between the outer shell and the inner shell as a phase change material; the hemispherical shell serves as a condensing liquid fuel collecting chamber, a liquid level sensor is arranged in the lower part of the hemispherical shell, and a first temperature sensor and a second temperature sensor are arranged in the conical shell in a diagonal manner; A plurality of main carbon chamber multi-hole vertical partitions are arranged in the main carbon chamber in a spaced manner, the auxiliary carbon chamber is located in a corner of the activated carbon tank, the volume ratio of the main carbon chamber to the auxiliary carbon chamber is 4:1, a first carbon hydrogen sensor is arranged in the lower part of the auxiliary carbon chamber, and a second carbon hydrogen sensor is arranged in the lower part of the main carbon chamber; The multi-hole horizontal partition is provided with a plurality of horizontal through holes with a diameter of 1.4-1.6 mm; The multi-hole vertical partition is provided with a plurality of vertical through holes with a diameter of 1.8-2.2 mm; A horizontal partition is arranged in the middle of the auxiliary carbon chamber in the vertical direction, and the distance H1 between the outer end of the horizontal partition and the chamber wall of the auxiliary carbon chamber is 1.8-2.2 mm.

2. The gaseous fuel evaporative condensation recovery system for a hybrid vehicle according to claim 1, wherein The condensing filling particles are made of copper or aluminum.

3. The control method of the gaseous fuel vaporization and condensation recovery system for a hybrid vehicle according to claim 1 or 2, characterized by: The application comprises the following corresponding steps in different working conditions: First, preset the following parameters in the controller respectively: the maximum pressure P high of the oil tank, the minimum pressure P low of the oil tank, the maximum temperature T hig of the condensing container, and the minimum temperature T low of the condensing container, and then perform the corresponding steps of different working conditions of A pressure relief, B desorption, and C pressure relief and desorption at the same time respectively. A pressure relief: A1) When the pressure sensor in the oil tank detects that the oil tank pressure is higher than the maximum oil tank pressure P high The controller instructs to open the pressure relief valve, the refrigerator and the electrically controlled atmospheric valve. The gaseous fuel in the oil tank enters the condensing tube of the condensing container through the pressure relief valve, the bypass pipe and the first upper connecting pipe in turn. The condensed liquid fuel flows out from the lower end port of the condensing tube and then flows into the liquid collection chamber at the lower end of the condensing container through the porous horizontal partition plate. A2) The controller instructs to turn on the corresponding ports of the second electrically controlled three-way valve and the main carbon chamber electrically controlled two-way valve, the gaseous fuel in the condensing container that is not condensed enters the main carbon chamber of the activated carbon tank in sequence through the second upper connecting pipe, the second electrically controlled three-way valve and the main carbon chamber electrically controlled two-way valve for adsorption; A3) When the pressure sensor detects that the oil tank pressure is lower than the preset value P low , the pressure relief valve is closed; during the pressure relief process, the condensing container temperature is detected by the first temperature sensor and the second temperature sensor, and when the condensing container temperature is lower than the condensing container minimum temperature T low , the controller instructs the freezer to stop and the electrically controlled air valve to close; at this time, the phase change material of the 15% NaCl solution provides cold energy for the condensing container; when the condensing container temperature is higher than the condensing container maximum temperature T high , the controller instructs the freezer and the electrically controlled air valve to be turned on, and the cycle is repeated in this way. A4) After the pressure relief valve is closed, the temperature of the condensing container is detected by the first temperature sensor and the second temperature sensor. If the phase change material still has cold energy and the first carbon hydrogen sensor detects that the auxiliary carbon cavity is in an empty state or a low load state of 10% to 20% volume, the controller instructs to start the air pressure pump and the electrically controlled air valve, and instructs to turn on the corresponding ports of the first electrically controlled three-way valve, the second electrically controlled three-way valve and the third electrically controlled three-way valve, and the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, so that the gaseous fuel in the main carbon cavity after desorption treatment is sequentially adsorbed and condensed in the condensing pipe at the upper part of the condensing container through the main carbon cavity electrically controlled two-way valve, the second electrically controlled three-way valve, the first electrically controlled three-way valve, the air pressure pump and the first upper connecting pipe, and flows to the liquid collecting cavity; the gaseous fuel not condensed is sequentially adsorbed in the auxiliary carbon cavity through the second upper connecting pipe, the third electrically controlled three-way valve and the auxiliary carbon cavity electrically controlled two-way valve; when the cold energy of the phase change material is consumed or the phase change material has cold energy and the auxiliary carbon cavity is in an empty state or a low load state of 10% to 20% volume, the pressure relief process is ended, and the controller instructs to open the oil liquid backflow valve, so that the liquid fuel in the oil collecting cavity flows back to the oil tank; B desorption B1) When the second carbon hydrogen sensor detects that the main carbon cavity is in a saturated state and the first carbon hydrogen sensor detects that the auxiliary carbon cavity is in an empty state or a low load state of 10% to 20% volume at the same time, the controller instructs to open the air pressure pump, the refrigerator and the electrically controlled air valve, and repeats step A2) to complete the adsorption of the gaseous fuel into the main carbon cavity; B2) The process after the temperature of the condensing container is detected by the first temperature sensor and the second temperature sensor in step A3) is repeated, when the adsorption amount of fuel in the main carbon cavity reaches 75%, the controller instructs the refrigerator to stop and the electrically controlled air valve to be closed; the temperature of the condensing container is detected by the first temperature sensor and the second temperature sensor, so as to determine whether the phase change material still has cold energy, if it still has cold energy, the process of step A2) is repeated to continue to adsorb the gaseous fuel into the main carbon cavity; until the cold energy of the phase change material is released, if it is determined that the phase change material has no cold energy, the whole desorption and condensation process is ended; the controller instructs to open the oil liquid backflow valve, so that the liquid fuel in the oil collecting cavity at the lower part of the condensing container flows back to the oil tank; B3) When the first carbon hydrogen sensor and the second carbon hydrogen sensor detect that the main carbon cavity and the auxiliary carbon cavity are both saturated, the engine is started at this time, and the controller instructs to open each electrically controlled three-way valve, the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, so that air filtered through the air filter enters the main carbon cavity through the output pipe, and enters the auxiliary carbon cavity through the fourth electrically controlled three-way valve, to flush and desorb the gaseous fuel in the main carbon cavity and the auxiliary carbon cavity, and then respectively pass through the main carbon cavity electrically controlled two-way valve and the auxiliary carbon cavity electrically controlled two-way valve, sequentially pass through the third electrically controlled three-way valve, the second electrically controlled three-way valve and the first electrically controlled three-way valve corresponding ports, and finally pass through the engine intake manifold and enter the engine; C desorption while pressure relief C1) engine working, repeat A1) step process for pressure relief, while the controller instructs open each electric control three-way valve, main carbon cavity electric control two-way valve and vice carbon cavity electric control two-way valve, using engine intake manifold vacuum makes air after filtering through air filter into the main carbon cavity and vice carbon cavity, flushing desorption of gaseous fuel in the main carbon cavity and vice carbon cavity, then the gaseous fuel of main carbon cavity in turn through the main carbon cavity electric control two-way valve, second electric control three-way valve and first electric control three-way valve corresponding port, and then through the engine intake manifold into the engine; The gaseous fuel of vice carbon cavity in turn through the vice carbon cavity electric control two-way valve, third electric control three-way valve and main carbon cavity gas fuel and into a road through the engine intake manifold into the engine; The gaseous fuel in the condenser container which is not condensed in turn through the second upper connecting pipe, third electric control three-way valve corresponding port into the vice carbon cavity adsorption; C2) Detecting the condensing vessel temperature by the first temperature sensor and the second temperature sensor, when the temperature value is lower than the lowest temperature T low of the condensing vessel, the controller instructs the freezer to stop and the electrically controlled air valve to close; at this time, the phase change material provides cold energy for the condensing vessel; when the temperature is higher than the highest temperature T high of the condensing vessel, the controller instructs the freezer to start and the electrically controlled air valve to open, and the cycle is repeated. C3) when the main carbon cavity adsorption capacity is less than 20% of the maximum adsorption capacity of the main carbon cavity, the controller instructs the freezer to stop, the electric control atmospheric valve is closed, and the engine also stops working, the car turns into motor drive; At this time, through the first temperature sensor and the second temperature sensor to detect the temperature of the condenser container, if the controller determines that the phase change material still has cold, the controller instructs to open the air pressure pump, the freezer and the electric control atmospheric valve, the gaseous fuel in the condenser container in turn through the second upper connecting pipe, third electric control three-way valve corresponding port, vice carbon cavity electric control two-way valve into the vice carbon cavity for adsorption; The gaseous fuel in the main carbon cavity after adsorption treatment in turn through the main carbon cavity electric control two-way valve, second electric control three-way valve corresponding port, first electric control three-way valve corresponding port, air pressure pump, first upper connecting pipe into the condenser container to condense into liquid fuel, until the cold of the condenser container is released, if the cold of the phase change material in the double-layer shell of the condenser container is released, the pressure relief desorption process is ended, the controller instructs to open the oil liquid backflow valve, and the liquid fuel in the lower oil collecting cavity of the condenser container flows back to the oil tank.

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