Fuel desorption system, control method, engine system and vehicle

Abstract

The invention 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; the three-way valve comprises a first input end, a second input end and a three-way valve output end, the first input end is connected with the output end of the ash filter, the second input end is connected with the output end of the engine air filter, and the three-way valve output end is connected with the input end of the carbon tank assembly; the first input end is communicated with the output end of the three-way valve in a first state, and the second input end is communicated with the output end of the three-way valve in a second state; the controller is connected with the three-way valve and used for controlling the state of the three-way valve to be switched into the first state or the second state based on the wading height. The high advantage of the engine air filter is fully utilized, additional arrangement of an air inlet device of the carbon tank assembly is avoided, and the effect of reducing the vehicle production and manufacturing cost on the premise that water is prevented from entering the carbon tank assembly is achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a fuel desorption system, a control method, an engine system and a vehicle. Background Art

[0002] The fuel desorption system includes a carbon canister assembly and an air intake device of the carbon canister assembly, which is used to separate the fuel adsorbed by the carbon canister assembly from the carbon canister assembly. In the process of separating the fuel from the carbon canister assembly, the air intake device needs to inhale a large amount of air from the outside and blow the fuel out of the carbon canister assembly by blowing. However, if the vehicle is desorbing the fuel on a flooded road, it is very easy for the accumulated water to enter the carbon canister assembly together with the air when the air intake device inhales air, causing the carbon canister assembly to fail due to water ingestion.

[0003] In the related art, in order to prevent water from entering the carbon canister assembly, an additional air intake device with a higher air intake input end position is set. When the vehicle enters a flooded road, the air intake device of the carbon canister assembly is switched to an air intake device with a higher input end position, thereby raising the input end height of the fuel desorption system. However, this method requires at least two air intake devices to be set for the carbon canister assembly, which increases the production and manufacturing cost of the vehicle. Summary of the invention

[0004] Based on this, the present application proposes a fuel desorption system, a control method, an engine system and a vehicle to solve the problem of how to reduce the vehicle production cost while avoiding water ingress into the carbon canister assembly.

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

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

[0007] A three-way valve, comprising a first input end, a second input end and a three-way valve output end, wherein the first input end is connected to the output end of the ash filter, the second input end is connected to the output end of the engine air filter, and the three-way valve output end is connected to the input end 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 end is connected to the output end of the three-way valve. In the second state, the second input end is connected to the output end of the three-way valve.

[0009] A water level monitor connected to the controller and used to obtain the wading height of the vehicle;

[0010] The controller is connected to the three-way valve, and is used to control the three-way valve to switch from a 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 the water leaving timing when the wading height is lower than or equal to a first preset height;

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

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

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

[0016] Optionally, the system further comprises an engine, and a throttle connected to an input end of the engine, wherein an end of the throttle away from the engine is connected to an output end of the engine air filter.

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

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

[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 a second preset height.

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

[0022] The controller is also used to control the warning device to output a wading warning 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 the present 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 the embodiment of the present application, the fuel desorption system includes: a controller, a carbon canister assembly, a three-way valve, an ash filter and an engine air filter, the controller is connected to the three-way valve, the first input end of the three-way valve is connected to the output end of the ash filter, the second input end of the three-way valve is connected to the output end of the engine air filter, the output end of the three-way valve is connected to the input end of the carbon canister assembly, the three-way valve includes a first state and a second state, in the first state, the first input end is connected to the output end of the three-way valve, in the second state, the second input end is connected to the output end of the three-way valve, the control method includes:

[0024] Get the wading height of the vehicle;

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

[0026] A third aspect of the present application provides an engine system, which includes the fuel desorption system described in the first aspect of the present application.

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

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

[0029] A fuel desorption system provided by the present application is provided 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, wherein the three-way valve output end 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. The present application connects the engine air filter input end to the carbon canister assembly through the three-way valve on the basis of the original ash filter input end of the fuel desorption system, and adds the engine air filter input end to the intake device of the fuel desorption system. Since the engine air filter is provided to provide clean air for the engine, the height of its input end is higher than the height of the ash filter input end, and therefore the engine air filter input end is connected to the carbon canister assembly, making full use of the height advantage of the engine air filter, avoiding the addition of the intake device of the carbon canister assembly, and achieving the effect of reducing the vehicle production and manufacturing cost under the premise of avoiding water ingress into the carbon canister assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 It is a structural schematic diagram of a fuel desorption system provided in an embodiment of the present application;

[0032] Figure 2 It is a step diagram of a control method of a fuel desorption system provided in an embodiment of the present application;

[0033] Figure 3 It is a step diagram of a control method for a fuel desorption system that controls a three-way valve to a first state provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1-carbon canister assembly, 2-ash filter, 3-engine air filter, 4-controller, 41-timing module, 5-three-way valve, 51-first input end, 52-second input end, 53-three-way valve output end, 6-water level monitor, 7-engine, 8-throttle, 9-solenoid valve, 10-alarm device. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The fuel desorption system includes a carbon canister assembly and an air intake device of the carbon canister assembly, which is used to separate the fuel adsorbed by the carbon canister assembly from the carbon canister assembly. Among them, in order to obtain clean air and prevent dust and impurities from entering, the air intake device of the carbon canister assembly at least includes an air intake duct and an ash filter (i.e., a dust filter) connected to the air intake duct. In the process of separating the fuel from the carbon canister assembly, the air intake device needs to inhale a large amount of air from the outside. After the ash filter filters the dust and impurities in the air, the air is transported from the air intake duct to the carbon canister assembly, and the fuel is blown out of the carbon canister assembly by blowing. However, if the vehicle is desorbing fuel on a flooded road, it is very easy for the accumulated water to enter the carbon canister assembly together with the air when the air intake device inhales air, causing the carbon canister assembly to fail to inhale water.

[0038] In the related art, in order to prevent water from entering the carbon canister assembly, an additional air intake device with a higher air intake input end position is set. When the vehicle enters a flooded road, the air intake device of the carbon canister assembly is switched to an air intake device with a higher input end position, thereby raising the input end height of the fuel desorption system. However, this method requires at least two air intake devices to be set for the carbon canister assembly, which increases the production and manufacturing cost of the vehicle.

[0039] Based on this, in order to solve the problem of how to reduce the vehicle production and manufacturing costs under the premise of avoiding water ingress into the carbon canister assembly, the present application proposes a fuel desorption system, which is provided with a three-way valve, and the three-way valve includes a first input end, a second input end and a three-way valve output end, wherein the three-way valve output end 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. Through the three-way valve, the present application connects the engine air filter to the carbon canister assembly on the basis of the original ash filter input end of the fuel desorption system, and adds an engine air filter input end to the intake device of the fuel desorption system. Since the engine air filter is provided to provide clean air for the engine, the height of its input end is higher than the height of the ash filter input end. Therefore, the engine air filter input end is connected to the carbon canister assembly, which makes full use of the height advantage of the engine air filter, avoids the addition of the intake device of the carbon canister assembly, and achieves the effect of reducing the vehicle production and manufacturing costs under the premise of avoiding water ingress into the carbon canister assembly. Specifically including:

[0040] The first aspect of the present application proposes an embodiment, such as Figure 1As shown in the structural schematic diagram of a fuel desorption system, the system includes:

[0041] Carbon canister assembly 1, ash filter 2, engine air filter 3 and controller 4;

[0042] The three-way valve 5 comprises a first input end 51, a second input end 52 and a three-way valve output end 53, wherein the first input end 51 is connected to the output end of the ash filter 2, the second input end 52 is connected to the output end of the engine air filter 3, and the three-way valve output end 53 is connected to the input end 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 end 51 is connected to the three-way valve output end 53. In the second state, the second input end 52 is connected to the three-way valve output end 53.

[0044] A water level monitor 6, connected to the controller 4, for obtaining the wading height of the vehicle;

[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 a current state to a first state or a second state based on the wading height.

[0046] The carbon canister assembly 1 is a fuel adsorption device. Activated carbon powder is arranged in the carbon canister assembly 1. The activated carbon powder is used to adsorb the fuel volatilized during the breathing process of the fuel tank to prevent the fuel from escaping from the fuel tank and causing air pollution.

[0047] Ash filter 2, also known as dust filter, has a certain impurity adsorption capacity and is used to block dust in the air to obtain clean air. Engine air filter 3, that is, the air filter in the engine intake system, has the same function as ash filter 2. Engine air filter 3 can block air impurities in the engine intake duct, prevent impurities from entering the engine 7, and avoid excessive wear of the cylinder.

[0048] The controller 4 refers to a device installed on the vehicle that can mechanically or electronically control other modules in the system. For example, the controller 4 may include a specially designed permanent circuit or logic device (such as a dedicated processor, FPGA or ASIC) for controlling other modules in the system. The controller 4 may also include a programmable logic device or circuit temporarily configured by software (such as a general-purpose processing device or other programmable processor) for controlling other modules in the system. As for the specific mechanical method, or the use of a dedicated permanent circuit, or the use of a temporarily configured circuit (such as configured by software) to implement the hardware module, it can be determined based on cost and time considerations.

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

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

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

[0052] The water level monitor 6 is a device for monitoring the wading height of the vehicle, and can be various water level sensors. For example, an ultrasonic water level sensor monitors the water surface height through the reflection of ultrasonic waves by the water surface, thereby obtaining the wading height of the vehicle. The water level monitor 6 is connected to the controller 4 to send the obtained wading height to the controller 4 through the signal transmission channel established between the two.

[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 the first state or the second state based on the wading height of the vehicle. In an optional embodiment, when the wading height of the vehicle is lower than or equal to the preset height, the three-way valve 5 is controlled to switch from the current state to the first state, so that the carbon canister assembly 1 obtains clean air through the ash filter 2; when the wading height of the vehicle is higher than the preset height, the three-way valve 5 is controlled to switch from the current state to the second state, so that the carbon canister assembly 1 obtains 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 at a position lower than the input end of the ash filter 2, and the preset height is the installation height of the water immersion sensor. When the water immersion sensor is soaked in water, it indicates that the wading height is higher than the preset height, and the water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is soaked, 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 soaked in water, it indicates that the wading height is lower than or equal to the preset height, and the water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is not soaked, 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] A fuel desorption system provided in the present application is provided 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, wherein 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. Through the three-way valve 5, the present application connects the input end of the engine air filter 3 to the carbon canister assembly 1 on the basis of the original input end of the ash filter 2 of the fuel desorption system, and adds the input end of the engine air filter 3 to the intake device of the fuel desorption system. Since the engine air filter 3 is provided to provide clean air for the engine 7, the height of its input end is higher than the height of the input end of the ash filter 2, so the input end of the engine air filter 3 is connected to the carbon canister assembly 1, which makes full use of the height advantage of the engine air filter 3, avoids the addition of the intake device of the carbon canister assembly 1, and achieves the effect of reducing the production and manufacturing cost of the vehicle under the premise of avoiding water ingress to the carbon canister assembly 1.

[0056] The second aspect of the present application proposes an embodiment, which, in addition to comprising a fuel desorption system proposed in the first aspect of the present application, further comprises:

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

[0058] A timing module 41, used for starting the water leaving timing when the wading height is lower than or equal to a first preset height;

[0059] The 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 separation timing 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 height and to extend the service life of the three-way valve 5, the controller 4 also includes a timing module 41.

[0061] When the wading height of the vehicle is lower than or equal to the first preset height, the water-leaving timing starts. The timing duration of the water-leaving timing is used to represent the time between the moment when the wading height of the vehicle is lower than or equal to the first preset height and the current moment.

[0062] When the timing duration of the water separation timing is equal to the preset duration, it indicates that the vehicle has traveled to a road section with relatively stable road conditions, and the wading height of the vehicle will no longer be higher than the first preset height in a short time. At this time, the three-way valve 5 can be controlled to switch from the current state to the first state, so that the first input end 51 is connected to the three-way valve output end 53, and the fuel adsorbed by the carbon canister assembly 1 is blown out by the clean air filtered by the ash filter 2, thereby achieving the desorption of the fuel. Among them, the first preset height can be the height of the input end of the ash filter 2, or other heights lower than the input end of the ash filter 2, and the preset duration can be 1 minute or 2 minutes, or it can be determined based on the driving speed of the vehicle. The faster the vehicle driving speed, the shorter the preset duration, and the slower the vehicle driving speed, the longer the preset duration.

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

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

[0065] The three-way valve 5 includes a third state in addition to the first state and the second state. When the three-way valve 5 is in the third state, the first input end 51 and the second input end 52 are disconnected from the three-way valve output end 53 at the same time. The first input end 51 and the second input end 52 cannot deliver air to the carbon canister assembly 1.

[0066] The target terminal may be a personal computer or other terminal that can perform OBD (On-Board Diagnostics) diagnosis on the vehicle.

[0067] According to the relevant national laws and regulations, the adsorption capacity of the carbon canister assembly 1 for fuel shall comply with relevant regulations. When judging the adsorption capacity of the carbon canister assembly 1, it can be based on the amount of fuel leakage, that is, measuring the fuel content in the output gas of the carbon canister assembly 1. If the fuel content in the output gas is high, it means that the adsorption capacity of the carbon canister assembly 1 for fuel is weak, and if the fuel content in the output gas is low, it means that the adsorption capacity of the carbon canister assembly 1 for fuel is strong.

[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 result, the input end of the carbon canister assembly 1 needs to be blocked. Therefore, in response to the diagnostic instruction 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 disconnected from the three-way valve output end 53 at the same time.

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

[0070] The engine 7 is a powertrain of the vehicle, and is used to provide driving force for the vehicle to travel. When the engine 7 is working, it needs to inhale clean air from the outside, ignite a mixture of air and fuel, drive the crankshaft to rotate, and then output driving force to the outside.

[0071] The throttle valve 8 is located on the intake passage of the engine 7, and adjusts the driving force outputted outward by the engine 7 by changing the intake area of ​​the intake passage of the engine 7. One end of the throttle valve 8 is connected to the input end of the engine 7, and the other end is connected to the output end of the engine air filter 3, so that the engine air filter 3 can provide clean air for the engine 7 and the carbon canister assembly 1 at the same time.

[0072] Optionally, the system further comprises 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 the controller 4, and the connection and disconnection of the two ends of the solenoid valve 9 are controlled by 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 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 and the input end of the engine 7, so that the air with fuel output from the carbon canister assembly 1 enters the combustion chamber of the engine 7 from the input end of the engine 7 through the solenoid valve 9.

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

[0076] The controller 4 is also used to control the engine 7 to stop working when the wading height is higher than a second preset height.

[0077] When the engine 7 is working, it needs to inhale air from the outside through the engine air filter 3 to provide oxygen for the combustion of the fuel. When the vehicle is traveling on a flooded road section, if the wading height of the vehicle is too high, the engine 7 is likely to inhale the accumulated water while inhaling air. After the engine 7 inhales the accumulated water, since the volume of the liquid is difficult to be compressed during the movement of the piston, it is very easy to cause the crankshaft and other components of the engine 7 to deform, causing damage to the engine 7.

[0078] Based on this, in order to avoid damage to the engine 7, the engine 7 should be controlled to stop working when the wading height of the vehicle is higher than the second preset height, so that the engine 7 stops inhaling air. The second preset height may be the height of the input end of the engine air filter 3, or other heights lower than the input end of the engine air filter 3.

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

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

[0081] When the wading height is too high, the vehicle may have problems such as water ingress and water leakage. With the development of vehicle electrification, the circuit distribution on the vehicle has become more and more complex. Therefore, when problems such as water ingress and water leakage occur, it will further cause the vehicle's electrical system failure, or even circuit leakage, which will seriously endanger the personal safety of the vehicle occupants.

[0082] Based on this, 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 time. The third preset height can be determined based on the location of the vehicle circuit system, and the third preset height should be lower than the lowest height of the waterproof weak point in the circuit system.

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

[0084] The third aspect of the present application proposes an embodiment, such as Figure 2As shown in the step diagram of 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, an ash filter 2 and an engine air filter 3. The controller 4 is connected to the three-way valve 5. The first input end 51 of the three-way valve 5 is connected to the output end of the ash filter 2. The second input end 52 of the three-way valve 5 is connected to the output end of the engine air filter 3. The three-way valve output end 53 is connected to the input end 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 end 51 is connected to the three-way valve output end 53. In the second state, the second input end 52 is connected to the three-way valve output end 53. The control method is applied to the controller 4, and the control method includes:

[0085] Step S101, obtaining the wading height of the vehicle.

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

[0087] The three-way valve 5 includes a first state and a second state. When the three-way valve 5 is in the first state, the first input end 51 is connected to the three-way valve output end 53, and the clean air filtered by the ash filter 2 flows to the first input end 51, and can flow to the carbon canister assembly 1 through the three-way valve output end 53. When the three-way valve 5 is in the second state, the second input end 52 is connected to the three-way valve output end 53, and the clean air filtered by the engine air filter 3 flows to the second input end 52, and can flow to the carbon canister assembly 1 through the three-way valve output end 53.

[0088] The wading height of the vehicle is the height of the part of the vehicle submerged by the water. The water height of the vehicle can be measured by a water level monitor 6 connected to the controller 4. In an 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 surface height through the reflection of ultrasonic waves by the water surface, and then obtains the wading height of the vehicle. The water level monitor 6 is connected to the controller 4 to send the obtained wading height to the controller 4 through the signal transmission channel established between the two.

[0089] Step S102, based on the wading height, controlling 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 by the carbon canister assembly 1 for fuel desorption is filtered by the ash filter 2; when the three-way valve 5 is in the second state, the air used by the carbon canister assembly 1 for fuel desorption is filtered by the engine air filter 3. Since the input end height of the engine air filter 3 is higher than the input end height of the ash filter 2, the wading height that allows the vehicle to travel normally when the three-way valve 5 is in the first state is lower than the wading height that allows the vehicle to travel normally 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 the first state or the second state based on the wading height of the vehicle. In an optional embodiment, when the wading height of the vehicle is lower than or equal to the preset height, the three-way valve 5 is controlled to switch from the current state to the first state, so that the carbon canister assembly 1 obtains clean air through the ash filter 2; when the wading height of the vehicle is higher than the preset height, the three-way valve 5 is controlled to switch from the current state to the second state, so that the carbon canister assembly 1 obtains 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 at a position lower than the input end of the ash filter 2, and the preset height is the installation height of the water immersion sensor. When the water immersion sensor is soaked in water, it indicates that the wading height is higher than the preset height, and the water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is soaked, 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 soaked in water, it indicates that the wading height is lower than or equal to the preset height, and the water immersion sensor sends a signal to the controller 4 indicating that the water immersion sensor is not soaked, 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] Alternatively, if Figure 3 As shown in the step diagram of a control method for a fuel desorption system that controls a three-way valve to be in a first state, in step S102, based on the wading height, the three-way valve 5 is controlled to switch from the current state to the first state or the second state, including:

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

[0095] Taking into account 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 height and to extend the service life of the three-way valve 5, the water departure timing starts when the vehicle's wading height is lower than or equal to the first preset height.

[0096] Step S1022, when the time duration of the water separation timing is equal to the preset time duration, the three-way valve 5 is controlled to switch from the current state to the first state.

[0097] When the timing duration of the water separation timing is equal to the preset duration, it indicates that the vehicle has traveled to a section of road with relatively stable road conditions, and the wading height of the vehicle will no longer be higher than the first preset height in a short period of time. At this time, the three-way valve 5 can be controlled to switch from the current state to the first state, so that the first input end 51 is connected to the three-way valve output end 53, and 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 separation timing can be realized by a timing module 41 provided in the controller 4. The timing duration of the water separation timing is used to characterize the time duration between the moment when the vehicle wading height is lower than or equal to the first preset height and the current moment.

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

[0100] In response to the diagnosis instruction sent by the target terminal, the three-way valve 5 is controlled to switch from the current state to the third state.

[0101] The three-way valve 5 includes a third state in addition to the first state and the second state. When the three-way valve 5 is in the third state, the first input end 51 and the second input end 52 are disconnected from the three-way valve output end 53 at the same time. The first input end 51 and the second input end 52 cannot deliver air to the carbon canister assembly 1.

[0102] The target terminal can be a personal computer or other terminal that can perform OBD diagnosis on the vehicle.

[0103] According to the relevant national laws and regulations, the adsorption capacity of the carbon canister assembly 1 for fuel shall comply with relevant regulations. When judging the adsorption capacity of the carbon canister assembly 1, it can be based on the amount of fuel leakage, that is, measuring the fuel content in the output gas of the carbon canister assembly 1. If the fuel content in the output gas is high, it means that the adsorption capacity of the carbon canister assembly 1 for fuel is weak, and if the fuel content in the output gas is low, it means that the adsorption capacity of the carbon canister assembly 1 for fuel is strong.

[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 result, the input end of the carbon canister assembly 1 needs to be blocked. Therefore, in response to the diagnostic instruction 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 disconnected from the three-way valve output end 53 at the same time.

[0105] Optionally, the system further 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, and the control method further includes:

[0106] When the fuel adsorption amount of the carbon canister assembly 1 is greater than the preset adsorption amount, 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 the controller 4, and the connection and disconnection of the two ends of the solenoid valve 9 are controlled by 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 output end of the engine 7. When the fuel adsorption amount of the carbon canister assembly 1 is greater than the preset adsorption amount, one end of the solenoid valve 9 is controlled to be connected with the other end, so that the air with fuel output from the carbon canister assembly 1 enters the combustion chamber of the engine 7 from the input end of the engine 7 through the solenoid valve 9.

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

[0109] When the engine 7 is working, it needs to inhale air from the outside through the engine air filter 3 to provide oxygen for the combustion of the fuel. When the vehicle is traveling on a flooded road section, if the wading height of the vehicle is too high, the engine 7 is likely to inhale the accumulated water while inhaling air. After the engine 7 inhales the accumulated water, since the volume of the liquid is difficult to be compressed during the movement of the piston, it is very easy to cause the crankshaft and other components of the engine 7 to deform, causing damage to the engine 7.

[0110] Based on this, in order to avoid damage to the engine 7, the engine 7 should be controlled to stop working when the wading height of the vehicle is higher than the second preset height, so that the engine 7 stops inhaling air. The second preset height may be the height of the input end of the engine air filter 3, or other heights lower than the input end of the engine air filter 3.

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

[0112] When the wading height is too high, the vehicle may have problems such as water ingress and water leakage. With the development of vehicle electrification, the circuit distribution on the vehicle has become more and more complex. Therefore, when problems such as water ingress and water leakage occur, it will further cause the vehicle's electrical system failure, or even circuit leakage, which will seriously endanger the personal safety of the vehicle occupants.

[0113] Based on this, 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 time.

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

[0115] The present application also provides an engine system, which includes the fuel desorption system described in the present application.

[0116] The present application also proposes a vehicle, which includes the fuel desorption system described in the present application, or includes the engine system described in the present application.

[0117] A fuel desorption system provided in the present application is provided 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, wherein 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. Through the three-way valve 5, the present application connects the input end of the engine air filter 3 to the carbon canister assembly 1 on the basis of the original input end of the ash filter 2 of the fuel desorption system, and adds the input end of the engine air filter 3 to the intake device of the fuel desorption system. Since the engine air filter 3 is provided to provide clean air for the engine 7, the height of its input end is higher than the height of the input end of the ash filter 2, so the input end of the engine air filter 3 is connected to the carbon canister assembly 1, which makes full use of the height advantage of the engine air filter 3, avoids the addition of the intake device of the carbon canister assembly 1, and achieves the effect of reducing the production and manufacturing cost of the vehicle under the premise of avoiding water ingress to the carbon canister assembly 1.

[0118] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0119] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0120] The above is a detailed introduction to a fuel desorption system, control method, engine system and vehicle provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A fuel desorption system, characterized in that: The system comprises: Carbon canister assembly, ash filter, engine air filter and controller; A three-way valve, comprising a first input end, a second input end and a three-way valve output end, wherein the first input end is connected to the output end of the ash filter, the second input end is connected to the output end of the engine air filter, and the three-way valve output end is connected to the input end of the carbon canister assembly; The three-way valve includes a first state and a second state. In the first state, the first input end is connected to the output end of the three-way valve. In the second state, the second input end is connected to the output end of the three-way valve. A water level monitor connected to the controller and used to obtain the wading height of the vehicle; The controller is connected to the three-way valve, and is used to control the three-way valve to switch from a current state to the first state or the second state based on the wading height.

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 the water leaving timing when the wading height is lower than or equal to a first preset height; The controller is further configured to control the three-way valve to switch from the current state to the first state when the timing duration of the water separation timing is equal to a preset duration.

3. The fuel desorption system according to claim 1, characterized in that: The three-way valve further comprises a third state, in which the first input end and the second input end are simultaneously disconnected from the output end of the three-way valve; The controller is connected to the target terminal, and is used for controlling the three-way valve to switch from the current state to the third state in response to a diagnostic instruction sent by the target terminal.

4. The fuel desorption system according to claim 1, characterized in that: The system further comprises an engine, and a throttle connected to an input end of the engine, wherein one end of the throttle away from the engine is connected to an output end of the engine air filter.

5. The fuel desorption system according to claim 4, characterized in that: The system further comprises a solenoid valve, the solenoid valve being connected to the controller, one end of the solenoid valve being connected to the output end of the carbon canister assembly, and the other end of the solenoid valve being connected to the input end of the engine; The controller is further used to control the solenoid valve to connect the output end of the carbon canister assembly with the input end of the engine when the fuel adsorption amount of the carbon canister assembly is greater than a preset adsorption amount.

6. The fuel desorption system according to claim 4, 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 a second preset height.

7. 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 warning device to output a wading warning when the wading height is higher than a third preset height, so as to remind the occupants to take emergency avoidance measures.

8. 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 to 7, the fuel desorption system comprising: a controller, a carbon canister assembly, a three-way valve, an ash filter and an engine air filter, the controller is connected to the three-way valve, the first input end of the three-way valve is connected to the output end of the ash filter, the second input end of the three-way valve is connected to the output end of the engine air filter, the output end of the three-way valve is connected to the input end of the carbon canister assembly, the three-way valve comprises a first state and a second state, in the first state, the first input end is connected to the output end of the three-way valve, in the second state, the second input end is connected to the output end of the three-way valve, the control method comprises: Get the wading height of the vehicle; Based on the wading height, the three-way valve is controlled to switch from a current state to the first state or the second state.

9. An engine system, comprising the fuel desorption system according to any one of claims 1-7.

10. A vehicle, comprising the fuel desorption system according to any one of claims 1 to 7, or comprising the engine system according to claim 9.

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