A fuel desorption system, control method, engine system and vehicle

Abstract

The application provides a fuel desorption system, a control method, an engine system and a vehicle, and belongs to the technical field of vehicles.The fuel desorption system comprises a carbon tank assembly, an ash filter, an engine air filter and a controller; a three-way valve comprising a first input end, a second input end and a three-way valve output end, the first input end being connected with the output end of the ash filter, the second input end being connected with the output end of the engine air filter, and the three-way valve output end being connected with the input end of the carbon tank assembly; in a first state, the first input end is in communication with the three-way valve output end, and in a second state, the second input end is in communication with the three-way valve output end; the controller is connected with the three-way valve and is used for controlling the state switching of the three-way valve to the first state or the second state based on the wading depth. The application fully utilizes the height advantage of the engine air filter, avoids the addition of an air inlet device of the carbon tank assembly, and realizes the effect of reducing the production cost of the vehicle under the premise of avoiding water entering the carbon tank assembly.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a fuel desorption system, control method, engine system, and vehicle. Background Technology

[0002] The fuel desorption system includes a carbon canister assembly and an air intake device for the carbon canister assembly, used to remove the fuel adsorbed in the carbon canister assembly. During the fuel separation process, the air intake device needs to draw in a large amount of air from the outside and blow the fuel out of the carbon canister assembly. However, if the vehicle is performing fuel desorption on a flooded road, water can easily enter the carbon canister assembly along with the air while the air intake device is drawing in air, causing the carbon canister assembly to malfunction due to water ingress.

[0003] In related technologies, to prevent water from entering the carbon canister assembly, an additional air intake device with a higher input position is installed. When the vehicle drives into flooded areas, the air intake device of the carbon canister assembly is switched to the one with the higher input position, thereby raising the input height of the fuel desorption system. However, this method requires at least two air intake devices for the carbon canister assembly, increasing the vehicle's manufacturing costs. Summary of the Invention

[0004] Based on this, this application proposes a fuel desorption system, control method, engine system, and vehicle to solve the problem of reducing vehicle manufacturing costs while avoiding water ingress into the carbon canister assembly.

[0005] A first aspect of this application provides a fuel desorption system, the fuel desorption system comprising:

[0006] Carbon canister assembly, ash filter, engine air filter, and controller;

[0007] The three-way valve includes a first input terminal, a second input terminal, and a three-way valve output terminal. The first input terminal is connected to the output terminal of the ash filter, the second input terminal is connected to the output terminal of the engine air filter, and the three-way valve output terminal is connected to the input terminal of the carbon canister assembly.

[0008] The three-way valve includes a first state and a second state. In the first state, the first input terminal is connected to the output terminal of the three-way valve. In the second state, the second input terminal is connected to the output terminal of the three-way valve.

[0009] A water level monitor, connected to the controller, is used to obtain the vehicle's wading depth.

[0010] The controller is connected to the three-way valve and is used to control the three-way valve to switch from the current state to the first state or the second state based on the wading height.

[0011] Optionally, the controller includes a timing module;

[0012] The timing module is used to start timing when the wading height is lower than or equal to a first preset height;

[0013] The controller is also used to control the three-way valve to switch from the current state to the first state when the timing duration of the water-free timer is equal to the preset duration.

[0014] Optionally, the three-way valve further includes a third state in which the first input terminal and the second input terminal are simultaneously disconnected from the output terminal of the three-way valve.

[0015] The controller is connected to the target terminal and is used to control the three-way valve to switch from the current state to the third state in response to the diagnostic command sent by the target terminal.

[0016] Optionally, the system further includes an engine and a throttle valve connected to the input of the engine, the end of the throttle valve remote from the engine being connected to the output of the engine air filter.

[0017] Optionally, the system further includes a solenoid valve connected to the controller, one end of which is connected to the output of the carbon canister assembly and the other end of which is connected to the input of the engine.

[0018] The controller is also configured to, when the fuel adsorption amount of the carbon canister assembly is greater than a preset adsorption amount, control the solenoid valve to connect the output end of the carbon canister assembly to the input end of the engine.

[0019] Optionally, the controller is also connected to the engine;

[0020] The controller is also used to control the engine to stop working when the wading height is higher than the second preset height.

[0021] Optionally, the system further includes an alarm device connected to the controller;

[0022] The controller is also used to control the alarm device to output a wading alarm when the wading height is higher than a third preset height, so as to remind the occupants to take emergency avoidance measures.

[0023] The second aspect of this application provides a control method for a fuel desorption system. The control method is applied to the fuel desorption system described in the first aspect of this application. The fuel desorption system includes: a controller, a carbon canister assembly, a three-way valve, a soot filter, and an engine air filter. The controller is connected to the three-way valve. A first input terminal of the three-way valve is connected to the output terminal of the soot filter. A second input terminal of the three-way valve is connected to the output terminal of the engine air filter. The output terminal of the three-way valve is connected to the input terminal of the carbon canister assembly. The three-way valve includes a first state and a second state. In the first state, the first input terminal is connected to the output terminal of the three-way valve. In the second state, the second input terminal is connected to the output terminal of the three-way valve. The control method includes:

[0024] Obtain the vehicle's wading depth;

[0025] Based on the wading depth, the three-way valve is controlled to switch from the current state to the first state or the second state.

[0026] A third aspect of this application provides an engine system comprising the fuel desorption system described in the first aspect of this application.

[0027] The fourth aspect of this application provides for a vehicle that includes the fuel desorption system described in the first aspect of this application, or the engine system described in the third aspect of this application.

[0028] This application discloses a fuel desorption system, control method, engine system, and vehicle. The fuel desorption system includes: a carbon canister assembly, a soot filter, an engine air filter, and a controller; a three-way valve including a first input terminal, a second input terminal, and a three-way valve output terminal, wherein the first input terminal is connected to the output terminal of the soot filter, the second input terminal is connected to the output terminal of the engine air filter, and the three-way valve output terminal is connected to the input terminal of the carbon canister assembly; the three-way valve includes a first state and a second state, wherein in the first state, the first input terminal is connected to the three-way valve output terminal, and in the second state, the second input terminal is connected to the three-way valve output terminal; a water level monitor connected to the controller for acquiring the wading depth of the vehicle; the controller is connected to the three-way valve for controlling the three-way valve to switch from the current state to the first state or the second state based on the wading depth.

[0029] This application provides a fuel desorption system equipped with a three-way valve, which includes a first input end, a second input end, and a three-way valve output end. The output end of the three-way valve is connected to the input end of the carbon canister assembly, the first input end is connected to the output end of the ash filter, and the second input end is connected to the output end of the engine air filter. This application, through the three-way valve, connects the engine air filter input end to the carbon canister assembly, adding an engine air filter input end to the intake device of the fuel desorption system. Since the engine air filter is designed to provide clean air to the engine, its input end is higher than that of the ash filter input end. Therefore, connecting the engine air filter input end to the carbon canister assembly fully utilizes the height advantage of the engine air filter, avoids the need for an additional intake device for the carbon canister assembly, and achieves the effect of reducing vehicle manufacturing costs while preventing water ingress into the carbon canister assembly. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a fuel desorption system provided in an embodiment of this application;

[0032] Figure 2 This is a flowchart illustrating the control method of a fuel desorption system provided in an embodiment of this application;

[0033] Figure 3 This is a flowchart illustrating the control method of a fuel desorption system that controls a three-way valve to its first state, as provided in an embodiment of this application.

[0034] Figure label:

[0035] 1-Carbon canister assembly, 2-Ash filter, 3-Engine air filter, 4-Controller, 41-Timing module, 5-Three-way valve, 51-First input terminal, 52-Second input terminal, 53-Three-way valve output terminal, 6-Water level monitor, 7-Engine, 8-Throttle valve, 9-Solenoid valve, 10-Alarm device. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] The fuel desorption system includes a carbon canister assembly and an air intake device for the carbon canister assembly, used to remove the fuel adsorbed in the carbon canister assembly. To obtain clean air and prevent dust and impurities from entering, the air intake device for the carbon canister assembly includes at least an intake manifold and a dust filter connected to the intake manifold. During the fuel separation process, the air intake device needs to draw in a large amount of air from the outside. After the dust filter removes dust and impurities from the air, the air is delivered from the intake manifold to the carbon canister assembly, where it blows the fuel out of the carbon canister assembly. However, if the vehicle is performing fuel desorption on a flooded road, water can easily enter the carbon canister assembly along with the air while the air intake device is drawing in air, causing the carbon canister assembly to malfunction due to water ingress.

[0038] In related technologies, to prevent water from entering the carbon canister assembly, an additional air intake device with a higher input position is installed. When the vehicle drives into flooded areas, the air intake device of the carbon canister assembly is switched to the one with the higher input position, thereby raising the input height of the fuel desorption system. However, this method requires at least two air intake devices for the carbon canister assembly, increasing the vehicle's manufacturing costs.

[0039] Based on this, to address the problem of reducing vehicle manufacturing costs while preventing water ingress into the carbon canister assembly, this application proposes a fuel desorption system equipped with a three-way valve. The three-way valve includes a first input end, a second input end, and a three-way valve output end. The output end of the three-way valve is connected to the input end of the carbon canister assembly, the first input end is connected to the output end of the ash filter, and the second input end is connected to the output end of the engine air filter. This application, through the three-way valve, connects the engine air filter to the carbon canister assembly on top of the existing ash filter input end of the fuel desorption system, adding an engine air filter input end to the intake device of the fuel desorption system. Since the engine air filter is designed to provide clean air to the engine, its input end is higher than that of the ash filter input end. Therefore, connecting the engine air filter input end to the carbon canister assembly fully utilizes the height advantage of the engine air filter, avoiding the need for an additional intake device for the carbon canister assembly, and achieving the effect of reducing vehicle manufacturing costs while preventing water ingress into the carbon canister assembly. Specifically, it includes:

[0040] The first aspect of this application provides an embodiment, such as... Figure 1A schematic diagram of a fuel desorption system is shown, the system comprising:

[0041] 1. Carbon canister assembly, 2. Ash filter, 3. Engine air filter, and 4. Controller;

[0042] The three-way valve 5 includes a first input terminal 51, a second input terminal 52, and a three-way valve output terminal 53. The first input terminal 51 is connected to the output terminal of the ash filter 2, the second input terminal 52 is connected to the output terminal of the engine air filter 3, and the three-way valve output terminal 53 is connected to the input terminal of the carbon canister assembly 1.

[0043] The three-way valve 5 includes a first state and a second state. In the first state, the first input terminal 51 is connected to the three-way valve output terminal 53. In the second state, the second input terminal 52 is connected to the three-way valve output terminal 53.

[0044] Water level monitor 6, connected to controller 4, is used to obtain the vehicle's wading height;

[0045] The controller 4 is connected to the three-way valve 5 and is used to control the three-way valve 5 to switch from the current state to the first state or the second state based on the wading height.

[0046] The carbon canister assembly 1 is a fuel adsorption device. The carbon canister assembly 1 contains activated carbon powder, which adsorbs the fuel that evaporates during the fuel tank's breathing process to prevent fuel from escaping from the fuel tank and causing air pollution.

[0047] The dust filter 2, also known as a ash filter, has a certain ability to adsorb impurities and is used to block dust in the air to obtain clean air. The engine air filter 3, which is the air filter in the engine intake system, has the same function as the dust filter 2. The engine air filter 3 can block air impurities in the engine intake passage, prevent impurities from entering the engine 7, and avoid excessive cylinder wear.

[0048] Controller 4 refers to a device installed on the vehicle that can control other modules in the system mechanically or electronically. For example, controller 4 may include specially designed permanent circuits or logic devices (such as dedicated processors, FPGAs, or ASICs) for controlling other modules in the system. Controller 4 may also include programmable logic devices or circuits (such as general-purpose processing devices or other programmable processors) temporarily configured by software for controlling other modules in the system. The specific method used to implement the hardware module—whether it is mechanical, a dedicated permanent circuit, or a temporarily configured circuit (such as one configured by software)—can be determined based on cost and time considerations.

[0049] The three-way valve 5 includes three ports: a first input terminal 51, a second input terminal 52, and a three-way valve output terminal 53. The first input terminal 51 is connected to the output terminal of the ash filter 2, allowing clean air filtered by the ash filter 2 to flow from the output terminal of the ash filter 2 into the first input terminal 51 of the three-way valve 5. The second input terminal 52 is connected to the input terminal of the engine air filter 3, allowing clean air filtered by the engine air filter 3 to flow from the output terminal of the engine air filter 3 into the second input terminal 52 of the three-way valve 5.

[0050] The three-way valve 5 has two states: a first state and a second state. When the three-way valve 5 is in the first state, the first input terminal 51 is connected to the three-way valve output terminal 53. Clean air filtered by the air filter 2 flows to the first input terminal 51 and can then flow to the carbon canister assembly 1 through the three-way valve output terminal 53. When the three-way valve 5 is in the second state, the second input terminal 52 is connected to the three-way valve output terminal 53. Clean air filtered by the engine air filter 3 flows to the second input terminal 52 and can then flow to the carbon canister assembly 1 through the three-way valve output terminal 53.

[0051] Based on this, it can be seen that when the three-way valve 5 is in the first state, the air used for fuel desorption by the carbon canister assembly 1 is filtered by the soot filter 2; when the three-way valve 5 is in the second state, the air used for fuel desorption by the carbon canister assembly 1 is filtered by the engine air filter 3. Since the height of the input end of the engine air filter 3 is higher than the height of the input end of the soot filter 2, the wading depth that allows the vehicle to drive normally when the three-way valve 5 is in the first state is lower than the wading depth that allows the vehicle to drive normally when the three-way valve 5 is in the second state.

[0052] The water level monitor 6 is a device used to monitor the wading height of a vehicle, and can be any type of water level sensor. For example, an ultrasonic water level sensor monitors the water level by detecting the reflection of ultrasonic waves on the water surface, thereby obtaining the vehicle's wading height. The water level monitor 6 is connected to the controller 4 to transmit the obtained wading height to the controller 4 through a signal transmission channel established between them.

[0053] The controller 4 is connected to the three-way valve 5 and is used to control the three-way valve 5 to switch from the current state to a first state or a second state based on the vehicle's wading depth. In an optional embodiment, when the vehicle's wading depth is lower than or equal to a preset depth, the controller controls the three-way valve 5 to switch from the current state to the first state, allowing the carbon canister assembly 1 to obtain clean air through the ash filter 2; when the vehicle's wading depth is higher than the preset depth, the controller controls the three-way valve 5 to switch from the current state to the second state, allowing the carbon canister assembly 1 to obtain clean air through the engine air filter 3.

[0054] In an optional embodiment, the water level monitor 6 can also be a water immersion sensor, which is installed below the input end of the ash filter 2. The preset height is the installation height of the water immersion sensor. When the water immersion sensor is submerged in water, it indicates that the wading depth is higher than the preset height. The water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is submerged, so that the controller 4 responds to the signal and controls the three-way valve 5 to switch from the current state to the second state. When the water immersion sensor is not submerged in water, it indicates that the wading depth is lower than or equal to the preset height. The water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is not submerged, so that the controller 4 responds to the signal and controls the three-way valve 5 to switch from the current state to the first state.

[0055] This application provides a fuel desorption system equipped with a three-way valve 5. The three-way valve 5 includes a first input end 51, a second input end 52, and a three-way valve output end 53. The three-way valve output end 53 is connected to the input end of the carbon canister assembly 1, the first input end 51 is connected to the output end of the ash filter 2, and the second input end 52 is connected to the output end of the engine air filter 3. This application, through the three-way valve 5, connects the input end of the engine air filter 3 to the carbon canister assembly 1, adding an engine air filter 3 input end to the intake device of the fuel desorption system, based on the existing ash filter 2 input end of the fuel desorption system. Since the engine air filter 3 is designed to provide clean air to the engine 7, its input end is higher than that of the ash filter 2 input end. Therefore, connecting the engine air filter 3 input end to the carbon canister assembly 1 fully utilizes the height advantage of the engine air filter 3, avoids the need for an additional intake device for the carbon canister assembly 1, and achieves the effect of reducing vehicle manufacturing costs while preventing water from entering the carbon canister assembly 1.

[0056] The second aspect of this application provides an embodiment that, in addition to including the fuel desorption system proposed in the first aspect of this application, further includes:

[0057] Optionally, the controller 4 includes a timing module 41;

[0058] Timing module 41 is used to start the water exit timing when the wading height is lower than or equal to the first preset height;

[0059] Controller 4 is also used to control the three-way valve 5 to switch from the current state to the first state when the timing duration of the water-free timer is equal to the preset duration.

[0060] Considering the variability of road conditions when the vehicle is driving on the road, in order to avoid frequent switching of the state of the three-way valve 5 caused by frequent changes in the vehicle's wading depth and to extend the service life of the three-way valve 5, the controller 4 also includes a timing module 41.

[0061] The exit timer starts when the vehicle's wading depth is lower than or equal to a first preset depth. The exit timer duration represents the time elapsed between the moment the vehicle's wading depth is lower than or equal to the first preset depth and the current moment.

[0062] When the wading timer reaches the preset duration, it indicates that the vehicle has reached a relatively stable road section, and the vehicle's wading depth will not exceed the first preset height for a short period. At this time, the three-way valve 5 can be switched from its current state to its first state, connecting the first input terminal 51 to the three-way valve output terminal 53. Clean air filtered by the ash filter 2 blows out the fuel adsorbed by the carbon canister assembly 1, thereby achieving fuel desorption. The first preset height can be the height of the input terminal of the ash filter 2, or any other height lower than the input terminal of the ash filter 2. The preset duration can be 1 minute or 2 minutes, or determined based on the vehicle's speed; the faster the vehicle travels, the shorter the preset duration, and the slower the vehicle travels, the longer the preset duration.

[0063] Optionally, the three-way valve 5 also includes a third state in which the first input terminal 51 and the second input terminal 52 are simultaneously disconnected from the three-way valve output terminal 53.

[0064] The controller 4 is connected to the target terminal. The controller 4 is used to control the three-way valve 5 to switch from the current state to the third state in response to the diagnostic command sent by the target terminal.

[0065] In addition to the first and second states, the three-way valve 5 also includes a third state. When the three-way valve 5 is in the third state, both the first input terminal 51 and the second input terminal 52 are simultaneously disconnected from the three-way valve output terminal 53. Neither the first input terminal 51 nor the second input terminal 52 can supply air to the carbon canister assembly 1.

[0066] The target terminal can be a personal computer or other terminal capable of performing OBD (On-Board Diagnostics) diagnostics on the vehicle.

[0067] According to relevant national laws and regulations, the fuel adsorption capacity of the carbon canister assembly 1 should meet the relevant requirements. When evaluating the adsorption capacity of the carbon canister assembly 1, it can be based on the amount of fuel leakage, i.e., measuring the fuel content in the output gas of the carbon canister assembly 1. A high fuel content in the output gas indicates a weak fuel adsorption capacity of the carbon canister assembly 1, while a low fuel content indicates a strong fuel adsorption capacity.

[0068] When measuring the fuel content of the output gas of the carbon canister assembly 1, in order to avoid leakage of the output gas and ensure the accuracy of the measurement results, it is necessary to block the input end of the carbon canister assembly 1. Therefore, in response to the diagnostic command sent by the target terminal, the three-way valve 5 should be controlled to switch from the current state to the third state, that is, the first input end 51 and the second input end 52 are simultaneously disconnected from the output end 53 of the three-way valve.

[0069] Optionally, the system also includes an engine 7 and a throttle valve 8 connected to the input of the engine 7, with the end of the throttle valve 8 away from the engine 7 connected to the output of the engine air filter 3.

[0070] Engine 7 is the vehicle's powertrain, used to provide driving force for the vehicle's movement. When engine 7 is working, it needs to draw in clean air from the outside, and by igniting the mixture formed by air and fuel, it drives the crankshaft to rotate, thereby outputting driving force.

[0071] Throttle valve 8 is located on the intake manifold of engine 7. By changing the intake area of ​​engine 7's intake manifold, it adjusts the magnitude of the driving force output by engine 7. One end of throttle valve 8 is connected to the input end of engine 7, and the other end is connected to the output end of engine air filter 3, thereby enabling engine air filter 3 to simultaneously provide clean air to engine 7 and carbon canister assembly 1.

[0072] Optionally, the system also includes a solenoid valve 9, which is connected to the controller 4. One end of the solenoid valve 9 is connected to the output end of the carbon canister assembly 1, and the other end is connected to the input end of the engine 7.

[0073] The controller 4 is also used to control the solenoid valve 9 to connect the output end of the carbon canister assembly 1 with the input end of the engine 7 when the fuel adsorption amount of the carbon canister assembly 1 is greater than the preset adsorption amount.

[0074] The fuel desorption system also includes a solenoid valve 9, which is connected to a controller 4. The controller 4 controls the connection and disconnection of the two ends of the solenoid valve 9. One end of the solenoid valve 9 is connected to the output end of the carbon canister assembly 1, and the other end is connected to the output end of the engine 7. When the fuel adsorption amount of the carbon canister assembly 1 is greater than the preset adsorption amount, the solenoid valve 9 is controlled to connect the output end of the carbon canister assembly 1 to the input end of the engine 7, so that the fuel-laden air output from the carbon canister assembly 1 enters the combustion chamber of the engine 7 from the input end of the engine 7 via the solenoid valve 9.

[0075] Optionally, the controller 4 is also connected to the engine 7;

[0076] Controller 4 is also used to control engine 7 to stop working when the wading depth is higher than the second preset depth.

[0077] When engine 7 is working, it needs to draw in air from the outside through engine air filter 3 to provide oxygen for fuel combustion. When the vehicle is driving through flooded areas, if the wading depth is too high, engine 7 may draw in water along with the air. After engine 7 draws in water, the volume of the liquid is difficult to compress during piston movement, which can easily cause deformation of components such as the crankshaft of engine 7, resulting in damage to engine 7.

[0078] Therefore, to prevent damage to the engine 7, the engine 7 should be shut down when the vehicle's wading depth exceeds the second preset height, thus stopping the engine 7 from drawing in air. The second preset height can be the height of the input end of the engine air filter 3, or any height lower than the input end of the engine air filter 3.

[0079] Optionally, the system also includes an alarm device 10 connected to the controller 4;

[0080] The controller 4 is also used to control the alarm device 10 to output a wading alarm when the wading height is higher than the third preset height, so as to remind the occupants to take emergency avoidance measures.

[0081] When wading through excessive water, vehicles may experience problems such as water ingress and leaks. With the advancement of vehicle electrification, the electrical circuits within vehicles have become increasingly complex. Therefore, when water ingress and leaks occur, they can further trigger electrical system malfunctions, even electrical leaks, posing a serious threat to the safety of vehicle occupants.

[0082] Therefore, to protect the personal safety of occupants and prevent major accidents, when the wading depth exceeds the third preset height, an alarm should be issued to the occupants via the alarm device 10 so that they can take appropriate emergency evasive measures in a timely manner. The third preset height can be determined based on the location of the vehicle's electrical system, and it should be lower than the minimum height of the weakest point in the waterproofing of the electrical system.

[0083] In one alternative implementation, the alarm device 10 may be a display device or speaker mounted on the vehicle, and the water wading alarm may be issued in the form of images, text, or voice.

[0084] A third aspect of this application provides an embodiment, such as... Figure 2The diagram illustrates a control method for a fuel desorption system. This embodiment proposes a control method for a fuel desorption system. The fuel desorption system includes: a controller 4, a carbon canister assembly 1, a three-way valve 5, a soot filter 2, and an engine air filter 3. The controller 4 is connected to the three-way valve 5. The first input terminal 51 of the three-way valve 5 is connected to the output terminal of the soot filter 2, the second input terminal 52 of the three-way valve 5 is connected to the output terminal of the engine air filter 3, and the output terminal 53 of the three-way valve is connected to the input terminal of the carbon canister assembly 1. The three-way valve 5 includes a first state and a second state. In the first state, the first input terminal 51 is connected to the output terminal 53 of the three-way valve. In the second state, the second input terminal 52 is connected to the output terminal 53 of the three-way valve. The control method is applied to the controller 4, and the control method includes:

[0085] Step S101: Obtain the vehicle's wading depth.

[0086] refer to Figure 1 The fuel desorption system includes a carbon canister assembly 1, a three-way valve 5, a soot filter 2, and an engine air filter 3. The first input terminal 51 of the three-way valve 5 is connected to the output terminal of the soot filter 2, the second input terminal 52 of the three-way valve 5 is connected to the output terminal of the engine air filter 3, and the output terminal 53 of the three-way valve is connected to the input terminal of the carbon canister assembly 1.

[0087] The three-way valve 5 has two states: a first state and a second state. When the three-way valve 5 is in the first state, the first input terminal 51 is connected to the three-way valve output terminal 53. Clean air filtered by the air filter 2 flows to the first input terminal 51 and can then flow to the carbon canister assembly 1 through the three-way valve output terminal 53. When the three-way valve 5 is in the second state, the second input terminal 52 is connected to the three-way valve output terminal 53. Clean air filtered by the engine air filter 3 flows to the second input terminal 52 and can then flow to the carbon canister assembly 1 through the three-way valve output terminal 53.

[0088] The wading height of a vehicle is the height of the portion of the vehicle submerged in water. This water height can be measured by a water level monitor 6 connected to the controller 4. In one optional embodiment, the water level monitor 6 can be various types of water level sensors. For example, an ultrasonic water level sensor monitors the water level by detecting the reflection of ultrasonic waves from the water surface, thus obtaining the vehicle's wading height. The water level monitor 6 is connected to the controller 4 to transmit the obtained wading height to the controller 4 via a signal transmission channel established between them.

[0089] Step S102: Based on the wading height, control the three-way valve 5 to switch from the current state to the first state or the second state.

[0090] When the three-way valve 5 is in the first state, the air used for fuel desorption by the carbon canister assembly 1 is filtered by the soot filter 2; when the three-way valve 5 is in the second state, the air used for fuel desorption by the carbon canister assembly 1 is filtered by the engine air filter 3. Because the inlet height of the engine air filter 3 is higher than the inlet height of the soot filter 2, the wading depth allowed for normal vehicle operation when the three-way valve 5 is in the first state is lower than the wading depth allowed for normal vehicle operation when the three-way valve 5 is in the second state.

[0091] The controller 4 is connected to the three-way valve 5 and is used to control the three-way valve 5 to switch from the current state to a first state or a second state based on the vehicle's wading depth. In an optional embodiment, when the vehicle's wading depth is lower than or equal to a preset depth, the controller controls the three-way valve 5 to switch from the current state to the first state, allowing the carbon canister assembly 1 to obtain clean air through the ash filter 2; when the vehicle's wading depth is higher than the preset depth, the controller controls the three-way valve 5 to switch from the current state to the second state, allowing the carbon canister assembly 1 to obtain clean air through the engine air filter 3.

[0092] In an optional embodiment, the water level monitor 6 can also be a water immersion sensor, which is installed below the input end of the ash filter 2. The preset height is the installation height of the water immersion sensor. When the water immersion sensor is submerged in water, it indicates that the wading depth is higher than the preset height. The water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is submerged, so that the controller 4 responds to the signal and controls the three-way valve 5 to switch from the current state to the second state. When the water immersion sensor is not submerged in water, it indicates that the wading depth is lower than or equal to the preset height. The water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is not submerged, so that the controller 4 responds to the signal and controls the three-way valve 5 to switch from the current state to the first state.

[0093] Optionally, such as Figure 3 The diagram illustrates a control method for a fuel desorption system that controls a three-way valve to be in a first state. Step S102, based on the wading depth, controls the three-way valve 5 to switch from its current state to either the first or second state, including:

[0094] Step S1021: When the wading height is lower than or equal to the first preset height, start the timer for leaving the water.

[0095] Considering the variability of road conditions when a vehicle is driving on the road, in order to avoid frequent switching of the state of the three-way valve 5 due to frequent changes in the vehicle's wading height and to extend the service life of the three-way valve 5, the water exit timer starts when the vehicle's wading height is lower than or equal to the first preset height.

[0096] Step S1022: When the timing duration of the water-free timer is equal to the preset duration, control the three-way valve 5 to switch from the current state to the first state.

[0097] When the wading timer reaches the preset duration, it indicates that the vehicle has reached a relatively stable road section and the vehicle's wading depth will not exceed the first preset height for a short period of time. At this time, the three-way valve 5 can be switched from the current state to the first state, so that the first input end 51 is connected to the output end 53 of the three-way valve. The clean air filtered by the ash filter 2 blows out the fuel adsorbed by the carbon canister assembly 1, thereby achieving fuel desorption.

[0098] The water exit timing can be implemented through the timing module 41 set in the controller 4. The water exit timing duration is used to characterize the time between the moment when the vehicle's wading height is lower than or equal to a first preset height and the current moment.

[0099] Optionally, the controller 4 is connected to the target terminal, and the three-way valve 5 also includes a third state in which the output terminal 53 of the three-way valve is simultaneously disconnected from both the first input terminal 51 and the second input terminal 52. The control method further includes:

[0100] In response to the diagnostic command sent by the target terminal, the three-way valve 5 is switched from the current state to the third state.

[0101] In addition to the first and second states, the three-way valve 5 also includes a third state. When the three-way valve 5 is in the third state, both the first input terminal 51 and the second input terminal 52 are simultaneously disconnected from the three-way valve output terminal 53. Neither the first input terminal 51 nor the second input terminal 52 can supply air to the carbon canister assembly 1.

[0102] The target terminal can be a personal computer or other terminal capable of performing OBD diagnostics on a vehicle.

[0103] According to relevant national laws and regulations, the fuel adsorption capacity of the carbon canister assembly 1 should meet the relevant requirements. When evaluating the adsorption capacity of the carbon canister assembly 1, it can be based on the amount of fuel leakage, i.e., measuring the fuel content in the output gas of the carbon canister assembly 1. A high fuel content in the output gas indicates a weak fuel adsorption capacity of the carbon canister assembly 1, while a low fuel content indicates a strong fuel adsorption capacity.

[0104] When measuring the fuel content of the output gas of the carbon canister assembly 1, in order to avoid leakage of the output gas and ensure the accuracy of the measurement results, it is necessary to block the input end of the carbon canister assembly 1. Therefore, in response to the diagnostic command sent by the target terminal, the three-way valve 5 should be controlled to switch from the current state to the third state, that is, the first input end 51 and the second input end 52 are simultaneously disconnected from the output end 53 of the three-way valve.

[0105] Optionally, the system also includes a solenoid valve 9, which is connected to the controller 4. One end of the solenoid valve 9 is connected to the output end of the carbon canister assembly 1, and the other end is connected to the input end of the engine 7. The control method further includes:

[0106] When the amount of fuel adsorbed in the carbon canister assembly 1 is greater than the preset amount of adsorption, one end of the control solenoid valve 9 is connected to the other end.

[0107] The fuel desorption system also includes a solenoid valve 9, which is connected to a controller 4. The controller 4 controls the connection and disconnection of the two ends of the solenoid valve 9. One end of the solenoid valve 9 is connected to the output end of the carbon canister assembly 1, and the other end is connected to the output end of the engine 7. When the fuel adsorption amount of the carbon canister assembly 1 is greater than the preset adsorption amount, the solenoid valve 9 is connected to the other end, so that the fuel-laden air output from the carbon canister assembly 1 enters the combustion chamber of the engine 7 from the input end of the engine 7 via the solenoid valve 9.

[0108] Optionally, the method further includes: controlling the engine 7 to stop working when the wading height is higher than the second preset height.

[0109] When engine 7 is working, it needs to draw in air from the outside through engine air filter 3 to provide oxygen for fuel combustion. When the vehicle is driving through flooded areas, if the wading depth is too high, engine 7 may draw in water along with the air. After engine 7 draws in water, the volume of the liquid is difficult to compress during piston movement, which can easily cause deformation of components such as the crankshaft of engine 7, resulting in damage to engine 7.

[0110] Therefore, to prevent damage to the engine 7, the engine 7 should be shut down when the vehicle's wading depth exceeds the second preset height, thus stopping the engine 7 from drawing in air. The second preset height can be the height of the input end of the engine air filter 3, or any height lower than the input end of the engine air filter 3.

[0111] Optionally, the method further includes: when the wading depth is higher than a third preset depth, controlling the alarm device 10 to output a wading alarm to remind the occupants to take emergency avoidance measures.

[0112] When wading through excessive water, vehicles may experience problems such as water ingress and leaks. With the advancement of vehicle electrification, the electrical circuits within vehicles have become increasingly complex. Therefore, when water ingress and leaks occur, they can further trigger electrical system malfunctions, even electrical leaks, posing a serious threat to the safety of vehicle occupants.

[0113] Therefore, in order to protect the personal safety of passengers and prevent major safety accidents, when the wading height is higher than the third preset height, an alarm should be issued to the passengers through the alarm device 10 so that the passengers can take appropriate emergency avoidance measures in a timely manner.

[0114] In one alternative implementation, the alarm device 10 may be a display device or speaker mounted on the vehicle, and the water wading alarm may be issued in the form of images, text, or voice.

[0115] This application also proposes an engine system including the fuel desorption system described in this application.

[0116] This application also proposes a vehicle that includes the fuel desorption system described in this application, or the engine system described in this application.

[0117] This application provides a fuel desorption system equipped with a three-way valve 5. The three-way valve 5 includes a first input end 51, a second input end 52, and a three-way valve output end 53. The three-way valve output end 53 is connected to the input end of the carbon canister assembly 1, the first input end 51 is connected to the output end of the ash filter 2, and the second input end 52 is connected to the output end of the engine air filter 3. This application, through the three-way valve 5, connects the input end of the engine air filter 3 to the carbon canister assembly 1, adding an engine air filter 3 input end to the intake device of the fuel desorption system, based on the existing ash filter 2 input end of the fuel desorption system. Since the engine air filter 3 is designed to provide clean air to the engine 7, its input end is higher than that of the ash filter 2 input end. Therefore, connecting the engine air filter 3 input end to the carbon canister assembly 1 fully utilizes the height advantage of the engine air filter 3, avoids the need for an additional intake device for the carbon canister assembly 1, and achieves the effect of reducing vehicle manufacturing costs while preventing water from entering the carbon canister assembly 1.

[0118] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0119] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0120] The above provides a detailed description of the fuel desorption system, control method, engine system, and vehicle provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A fuel desorption system, characterized in that, The system includes: Carbon canister assembly, ash filter, engine air filter, and controller; The three-way valve includes a first input terminal, a second input terminal, and a three-way valve output terminal. The first input terminal is connected to the output terminal of the ash filter, the second input terminal is connected to the output terminal of the engine air filter, and the three-way valve output terminal is connected to the input terminal of the carbon canister assembly. The three-way valve includes a first state and a second state. In the first state, the first input terminal is connected to the output terminal of the three-way valve. In the second state, the second input terminal is connected to the output terminal of the three-way valve. The height of the input terminal of the engine air filter is higher than the height of the input terminal of the ash filter. The engine air filter is configured to provide clean air to both the engine and the carbon canister assembly; A water level monitor, connected to the controller, is used to obtain the vehicle's wading depth. The controller is connected to the three-way valve and is used to control the three-way valve to switch to the first state when the wading height is lower than or equal to a first preset height; to control the three-way valve to switch to the second state when the wading height is higher than the first preset height; and to control the three-way valve to switch from the current state to the third state in response to a diagnostic command sent by the target terminal; wherein the first preset height is set based on the input height of the ash filter; the controller is connected to the target terminal; and in the third state, the first input terminal and the second input terminal are simultaneously disconnected from the output terminal of the three-way valve.

2. The fuel desorption system according to claim 1, characterized in that, The controller includes a timing module; The timing module is used to start timing when the wading height is lower than or equal to a first preset height; The controller is also used to control the three-way valve to switch from the current state to the first state when the timing duration of the water-free timer is equal to the preset duration.

3. The fuel desorption system according to claim 1, characterized in that, The system also includes an engine and a throttle valve connected to the input of the engine, with one end of the throttle valve remote from the engine connected to the output of the engine air filter.

4. The fuel desorption system according to claim 3, characterized in that, The system also includes a solenoid valve connected to the controller, with one end of the solenoid valve connected to the output end of the carbon canister assembly and the other end connected to the input end of the engine. The controller is also configured to, when the fuel adsorption amount of the carbon canister assembly is greater than a preset adsorption amount, control the solenoid valve to connect the output end of the carbon canister assembly to the input end of the engine.

5. The fuel desorption system according to claim 3, characterized in that, The controller is also connected to the engine; The controller is also used to control the engine to stop working when the wading height is higher than the second preset height.

6. The fuel desorption system according to claim 1, characterized in that, The system also includes an alarm device connected to the controller; The controller is also used to control the alarm device to output a wading alarm when the wading height is higher than a third preset height, so as to remind the occupants to take emergency avoidance measures.

7. A control method for a fuel desorption system, characterized in that, The control method is applied to the fuel desorption system according to any one of claims 1-6, the fuel desorption system comprising: a controller, a carbon canister assembly, a three-way valve, a soot filter, and an engine air filter, the controller being connected to the three-way valve, the first input terminal of the three-way valve being connected to the output terminal of the soot filter, the second input terminal of the three-way valve being connected to the output terminal of the engine air filter, and the output terminal of the three-way valve being connected to the input terminal of the carbon canister assembly, the three-way valve including a first state and a second state, in the first state, the first input terminal being connected to the output terminal of the three-way valve, and in the second state, the second input terminal being connected to the output terminal of the three-way valve, the control method comprising: Obtain the vehicle's wading depth; Based on the wading depth, the three-way valve is controlled to switch from the current state to the first state or the second state.

8. An engine system comprising a fuel desorption system as described in any one of claims 1-6.

9. A vehicle comprising a fuel desorption system as claimed in any one of claims 1-6, or comprising an engine system as claimed in claim 8.

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