Fuel vapor control method and device for extended-range vehicle, engine control apparatus, and storage medium

Abstract

The application relates to a fuel evaporation control method and device for a range extended vehicle, an engine control device, a fuel evaporation control system and a storage medium. The fuel evaporation control method is applied to an engine control device of a fuel evaporation control system; the fuel evaporation control system comprises the engine control device, a vehicle control device, a medium-pressure oil tank, a high-range oil tank pressure sensing device, an engine, a carbon canister electromagnetic valve and a medium-pressure oil tank flow control valve; the fuel evaporation control method comprises the following steps: in response to the range extended vehicle being in a hybrid mode, acquiring an oil tank pressure collected by the high-range oil tank pressure sensing device; in response to the oil tank pressure being greater than a first pressure threshold, outputting an engine start request signal to the vehicle control device; and in response to receiving an engine start control signal output by the vehicle control device, controlling the engine to start and controlling the carbon canister electromagnetic valve and the medium-pressure oil tank flow control valve to open. The method can reduce the cost and fuel evaporation control error.

Description

Technical Field

[0001] This application relates to the field of range-extended vehicle technology, and in particular to a fuel evaporation control method, device, engine control equipment, fuel evaporation control system, and storage medium for a range-extended vehicle. Background Technology

[0002] Currently, both plug-in hybrid electric vehicles (PHEVs) and range-extended electric vehicles use high-pressure fuel tanks to address the issue of insufficient carbon canister desorption, in order to meet the Type IV and VII test requirements of the China VI emission standard (GB183526-2016). With the high-pressure fuel tank installed, the entire vehicle employs a reference leak active detection method for evaporator system leak monitoring.

[0003] However, traditional fuel evaporation control methods suffer from high costs and large fuel evaporation control errors. Summary of the Invention

[0004] Therefore, it is necessary to provide a fuel evaporation control method, device, engine control equipment, fuel evaporation control system, and storage medium for range-extended electric vehicles that can reduce costs and fuel evaporation control errors, in order to address the aforementioned technical problems.

[0005] Firstly, a fuel evaporation control method for a range-extended electric vehicle is provided. This method is applied to the engine control equipment of a fuel evaporation control system. The fuel evaporation control system includes engine control equipment, vehicle control equipment, an intermediate-pressure fuel tank, a high-range fuel tank pressure sensor, an engine, a carbon canister solenoid valve, and an intermediate-pressure fuel tank flow control valve. The aforementioned fuel evaporation control method includes:

[0006] In response to the range-extended electric vehicle being in hybrid mode, the fuel tank pressure is acquired by a high-range fuel tank pressure sensor.

[0007] In response to the fuel tank pressure exceeding the first pressure threshold, an engine start request signal is output to the vehicle control equipment;

[0008] In response to receiving the engine start control signal from the vehicle control equipment, the engine is started, and the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve are opened.

[0009] In one embodiment, the method further includes obtaining the engine's operating state in response to the fuel tank pressure being less than a first pressure threshold and greater than a second pressure threshold; wherein the first pressure threshold is greater than the second pressure threshold; controlling the carbon canister solenoid valve to open and obtaining the carbon canister concentration in response to the operating state being a start-up state; controlling the medium-pressure fuel tank flow control valve to open in response to the carbon canister concentration being in a low concentration range; and returning to the step of obtaining the carbon canister concentration in response to the carbon canister concentration not being in a low concentration range.

[0010] In one embodiment, the method further includes: controlling the engine to start and controlling the intermediate pressure tank flow control valve to close in response to the tank pressure being less than a second pressure threshold.

[0011] In one embodiment, the method further includes: in response to the range-extended vehicle being in pure electric mode, controlling the medium-pressure fuel tank flow control valve to close and acquiring the fuel tank pressure; in response to the fuel tank pressure being greater than a first pressure threshold, controlling the medium-pressure fuel tank flow control valve to open and outputting an engine start request signal to the vehicle control equipment; and in response to receiving an engine start control signal, controlling the engine to start and controlling the carbon canister solenoid valve to open.

[0012] In one embodiment, the method further includes: in response to the extended-range vehicle being in refueling mode and receiving a refueling pressure relief request signal output by the vehicle control device, controlling the medium-pressure fuel tank flow control valve to open; wherein the refueling pressure relief request signal is determined by the vehicle control device based on the vehicle status of the extended-range vehicle when it receives a refueling start signal; acquiring the fuel tank pressure and determining whether the refueling pressure relief is in a completed state based on the fuel tank pressure; in response to the refueling pressure relief being in a completed state, outputting a refueling pressure relief completion signal to the vehicle control device, so that the vehicle control device controls the fuel tank cover of the extended-range vehicle to open based on the refueling pressure relief completion signal; in response to the refueling pressure relief not being in a completed state, outputting a refueling pressure relief not completed signal to the vehicle control device, so that the vehicle control device displays fuel tank cover operation failure information based on the refueling pressure relief not completed signal.

[0013] In one embodiment, the method further includes: controlling the medium-pressure fuel tank flow control valve to close in response to receiving a refueling end request signal output by the vehicle control device; wherein the refueling end request signal is determined by the vehicle control device based on the vehicle status of the range-extended vehicle when it receives the refueling end signal.

[0014] Secondly, a fuel evaporation control device for a range-extended electric vehicle is provided. The fuel evaporation control method is applied to the engine control equipment of the fuel evaporation control system. The fuel evaporation control system includes engine control equipment, vehicle control equipment, medium-pressure fuel tank, high-range fuel tank pressure sensing equipment, engine, carbon canister solenoid valve, and medium-pressure fuel tank flow control valve. The aforementioned fuel evaporation control device includes a data acquisition module, a start request module, and a start control module.

[0015] The data acquisition module is used to acquire the fuel tank pressure collected by the high-range fuel tank pressure sensor when the range-extended vehicle is in hybrid mode; the start request module is used to output an engine start request signal to the vehicle control equipment when the fuel tank pressure is greater than a first pressure threshold; and the start control module is used to control the engine to start and control the opening of the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve when the engine start control signal is received from the vehicle control equipment.

[0016] Thirdly, an engine control device is provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described in the above method embodiments.

[0017] Fourthly, a fuel evaporation control system is provided, which includes a vehicle control device, a medium-pressure fuel tank, a high-range fuel tank pressure sensor, an engine, a carbon canister solenoid valve, a medium-pressure fuel tank flow control valve, and any one of the engine control devices in the above-mentioned engine control device embodiments: wherein the engine control device is electrically connected to the high-range fuel tank pressure sensor, the engine, the carbon canister solenoid valve, and the medium-pressure fuel tank flow control valve; and the engine control device is communicatively connected to the vehicle control device.

[0018] Fifthly, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of any of the methods described in the above method embodiments.

[0019] The aforementioned fuel evaporation control method, device, engine control equipment, fuel evaporation control system, and storage medium for range-extended electric vehicles (REEVs) are described below. The fuel evaporation control method, in response to the REEV being in hybrid mode, acquires the fuel tank pressure collected by a high-range fuel tank pressure sensor. Then, in response to the fuel tank pressure exceeding a first pressure threshold, it outputs an engine start request signal to the vehicle control equipment. Next, in response to receiving the engine start control signal from the vehicle control equipment, it controls the engine to start and controls the opening of the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve, thereby timely completing fuel vapor desorption and releasing the pressure in the medium-pressure fuel tank. This reduces costs, improves the real-time performance of REEVs, meets both the operational and environmental requirements of REEVs, reduces fuel evaporation control errors, and improves the accuracy of fuel evaporation control. Attached Figure Description

[0020] Figure 1 This is a diagram illustrating the application environment of a fuel evaporation control method for a range-extended electric vehicle in one embodiment.

[0021] Figure 2 This is a schematic diagram of the first process of a fuel evaporation control method for a range-extended electric vehicle in one embodiment;

[0022] Figure 3 This is a schematic diagram of the second process of a fuel evaporation control method for a range-extended electric vehicle in one embodiment;

[0023] Figure 4 This is a schematic diagram of the third process of a fuel evaporation control method for a range-extended electric vehicle in one embodiment;

[0024] Figure 5 This is a schematic diagram of the fourth process of a fuel evaporation control method for a range-extended electric vehicle in one embodiment;

[0025] Figure 6 This is a schematic diagram of the fifth process of a fuel evaporation control method for a range-extended electric vehicle in one embodiment;

[0026] Figure 7 This is a structural block diagram of a fuel evaporation control device for a range-extended electric vehicle in one embodiment;

[0027] Figure 8 This is an internal structural diagram of the engine control device in one embodiment. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0031] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0032] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0033] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0034] The fuel evaporation control method for range-extended electric vehicles provided in this application can be applied to, for example... Figure 1 The application environment is shown. The aforementioned fuel evaporation control system 10 includes a vehicle control unit 100, a medium-pressure fuel tank 200, a high-range fuel tank pressure sensor 300, an engine 400, a carbon canister solenoid valve 500, a medium-pressure fuel tank flow control valve 600, and an engine control unit 700. Specifically, the engine control unit 700 is electrically connected to the high-range fuel tank pressure sensor 300, the engine 400, the carbon canister solenoid valve 500, and the medium-pressure fuel tank flow control valve 600; the engine control unit 700 is communicatively connected to the vehicle control unit 100.

[0035] In a specific example, the actual pressure-bearing capacity of the medium-pressure fuel tank can be, but is not limited to, 23 kPa; the range of the low-range fuel tank pressure sensor can be, but is not limited to, -3.75 to 3.5 kPa, mainly used for leak diagnosis of the fuel evaporation control system. It utilizes the negative pressure of the engine intake manifold to establish a vacuum in the fuel evaporation control system and monitors pressure changes in the system for diagnosis; the range of the high-range fuel tank pressure sensor can be, but is not limited to, -20 to 40 kPa, mainly used for monitoring the internal pressure of the fuel tank to ensure fuel tank pressure safety. The above are just specific examples; in actual applications, settings can be flexibly configured according to requirements, and no restrictions are imposed here.

[0036] In a specific example, the vehicle control device may be, but is not limited to, a vehicle control unit (VCU), the high-range fuel tank pressure sensing device may be, but is not limited to, a high-range fuel tank pressure sensor, and the engine control device may be, but is not limited to, an engine control unit (ECU). The above are just specific examples, and in actual applications, they can be flexibly set according to requirements, without any restrictions.

[0037] In one embodiment, such as Figure 2 As shown, a fuel evaporation control method for a range-extended electric vehicle is provided, which is applied to... Figure 1 The following steps are used as an example of the engine control device 700, including steps 201 to 203.

[0038] Step 201: In response to the range-extended vehicle being in hybrid mode, acquire the fuel tank pressure collected by the high-range fuel tank pressure sensing device.

[0039] Specifically, the operating modes of the range-extended electric vehicle include hybrid mode, pure electric mode, and refueling mode. When the engine control unit 700 detects that the range-extended electric vehicle is in hybrid mode, it acquires the fuel tank pressure collected by the high-range fuel tank pressure sensor 300. Thus, the fuel tank pressure of the medium-pressure fuel tank 200 can be accurately and timely understood through the fuel tank pressure collected by the high-range fuel tank pressure sensor 300.

[0040] Step 202: In response to the fuel tank pressure being greater than the first pressure threshold, an engine start request signal is output to the vehicle control equipment.

[0041] Specifically, when the engine control device 700 detects that the fuel tank pressure is greater than a first pressure threshold, it outputs an engine start request signal to the vehicle control device 100, so that the vehicle control device 100 can determine whether to control the engine 400 to start based on the engine start request signal output by the engine control device 700. It can be understood that when the vehicle control device 100 needs to control the engine 400 to start based on the engine start request signal output by the engine control device 700, it can output an engine start control signal to the engine control device 700.

[0042] Step 203: In response to receiving the engine start control signal output by the vehicle control equipment, control the engine to start and control the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve to open.

[0043] Specifically, upon receiving the engine start control signal from the vehicle control equipment 100, the engine control device 700 can directly control the engine 400 to start and control the opening of the carbon canister solenoid valve 500 and the intermediate-pressure fuel tank flow control valve 600. This allows for timely fuel vapor desorption and release of pressure in the intermediate-pressure fuel tank, thereby reducing costs and improving the real-time performance of the range-extended vehicle. It is understandable that the range-extended vehicle's fuel evaporation control system includes an intermediate-pressure fuel tank 200. The engine control device 700 uses the pressure in the intermediate-pressure fuel tank 200 to determine whether fuel vapor desorption and pressure release are necessary. Compared to using a high-pressure fuel tank in the range-extended vehicle's fuel evaporation control system, this approach satisfies both the operational and environmental requirements of the range-extended vehicle, reduces fuel evaporation control errors, improves fuel evaporation control accuracy, and is more environmentally friendly. Furthermore, configuring a high-range fuel tank pressure sensor in the fuel evaporation control system of a range-extended electric vehicle (REEV) can obtain more accurate fuel tank pressure data compared to configuring a low-range fuel tank pressure sensor in the same system.

[0044] The aforementioned fuel evaporation control method for range-extended electric vehicles (REEVs) acquires the fuel tank pressure collected by the high-range fuel tank pressure sensor 300 when the REEV is in hybrid mode. Then, in response to the fuel tank pressure exceeding a first pressure threshold, an engine start request signal is output to the vehicle control device 100. Next, in response to receiving the engine start control signal from the vehicle control device 100, the engine is started, and the carbon canister solenoid valve 500 and the medium-pressure fuel tank flow control valve 600 are opened to promptly complete fuel vapor desorption and release the pressure in the medium-pressure fuel tank. This reduces costs, improves the real-time performance of REEVs, meets both the operational and environmental requirements of REEVs, reduces fuel evaporation control errors, and improves the accuracy of fuel evaporation control.

[0045] In one embodiment, such as Figure 3 As shown, the above method also includes steps 301 to 304.

[0046] Step 301: In response to the fuel tank pressure being less than the first pressure threshold and greater than the second pressure threshold, the engine operating status is obtained.

[0047] Step 302: In response to the working state being the start state, control the carbon canister solenoid valve to open and obtain the carbon canister concentration.

[0048] Step 303: In response to the carbon canister concentration being in the low concentration range, the flow control valve of the medium-pressure oil tank is opened.

[0049] Step 304: In response to the carbon canister concentration not being in the low concentration range, return to the step of obtaining the carbon canister concentration.

[0050] The first pressure threshold is greater than the second pressure threshold. In a specific example, the first pressure threshold may be, but is not limited to, 20 kPa, and the second pressure threshold may be, but is not limited to, 5 kPa. The above are just specific examples; in actual applications, they can be flexibly set according to requirements, and no restrictions are imposed here. In addition, the engine's operating state includes the start state and the stop state.

[0051] Understandably, when the engine control device 700 detects that the fuel tank pressure is less than the first pressure threshold but greater than the second pressure threshold, it acquires the operating status of the engine 400. Then, when it detects that the operating status is the start-up state, it controls the carbon canister solenoid valve 500 to open and acquires the carbon canister concentration. Next, when it detects that the carbon canister concentration is in the low concentration range, that is, when the carbon canister concentration is low, it controls the intermediate-pressure fuel tank flow control valve 600 to open, thereby releasing the pressure in the intermediate-pressure fuel tank 200, improving the accuracy of fuel evaporation control, and making it more environmentally friendly. Finally, when it detects that the carbon canister concentration is not in the low concentration range, it returns to the step of acquiring the carbon canister concentration again until the carbon canister concentration is in the low concentration range before controlling the intermediate-pressure fuel tank flow control valve 600 to open, ensuring environmental protection while reducing costs. Furthermore, when the engine is in the start-up state, the medium-pressure oil tank flow control valve 600 is only opened after confirming that the carbon canister concentration is low, thereby releasing the pressure in the medium-pressure oil tank. This is equivalent to directly controlling the opening of the medium-pressure oil tank flow control valve 600 when the engine 400 is in the start-up state, which ensures environmental protection while reducing costs.

[0052] In this embodiment, in response to the fuel tank pressure being less than a first pressure threshold and greater than a second pressure threshold, the operating state of the engine 400 is obtained; then, in response to the operating state being the start state, the carbon canister solenoid valve 500 is controlled to open, and the carbon canister concentration is obtained; next, in response to the carbon canister concentration being in the low concentration range, the medium-pressure fuel tank flow control valve 600 is controlled to open; finally, in response to the carbon canister concentration not being in the low concentration range, the process returns to the step of obtaining the carbon canister concentration, thereby improving the accuracy of fuel evaporation control, ensuring environmental protection while reducing costs.

[0053] In one embodiment, such as Figure 4 As shown, the above method also includes step 401.

[0054] Step 401: In response to the oil tank pressure being less than the second pressure threshold, control the engine to start and control the medium-pressure oil tank flow control valve to close.

[0055] Specifically, when the engine control device 700 detects that the fuel tank pressure is less than the second pressure threshold, it controls the engine 400 to start and controls the intermediate pressure fuel tank flow control valve 600 to close, thereby sealing the fuel vapor inside the intermediate pressure fuel tank 200, ensuring environmental protection while reducing costs.

[0056] In this embodiment, in response to the fuel tank pressure being less than the second pressure threshold, the engine is controlled to start, and the medium-pressure fuel tank flow control valve is controlled to close, thus ensuring environmental friendliness while reducing costs.

[0057] In one embodiment, such as Figure 5 As shown, the above method also includes steps 501 to 503.

[0058] Step 501: In response to the range-extended vehicle being in pure electric mode, control the medium-pressure fuel tank flow control valve to close and obtain the fuel tank pressure;

[0059] Step 502: In response to the oil tank pressure being greater than the first pressure threshold, control the medium-pressure oil tank flow control valve to open and output an engine start request signal to the vehicle control equipment;

[0060] Step 503: In response to receiving the engine start control signal, control the engine to start and control the carbon canister solenoid valve to open.

[0061] Specifically, when the engine control device 700 detects that the range-extended vehicle is in pure electric mode, it can directly control the intermediate-pressure fuel tank flow control valve 600 to close and obtain the fuel tank pressure. Then, only when the fuel tank pressure is detected to be greater than a first pressure threshold, the engine control device 700 controls the intermediate-pressure fuel tank flow control valve 600 to open, thereby releasing the pressure in the intermediate-pressure fuel tank 200 and outputting an engine start request signal to the vehicle control device 100. Next, when the engine start control signal is received, the engine 400 is controlled to start, and the carbon canister solenoid valve 500 is controlled to open, thereby achieving fuel vapor desorption. This ensures precise control of fuel evaporation when the range-extended vehicle is in pure electric mode, ensuring environmental protection while reducing costs.

[0062] In this embodiment, in response to the fuel tank pressure being less than the second pressure threshold, the engine is controlled to start, and the intermediate-pressure fuel tank flow control valve is controlled to close. Then, in response to the fuel tank pressure being greater than the first pressure threshold, the intermediate-pressure fuel tank flow control valve is controlled to open, and an engine start request signal is output to the vehicle control equipment. Next, in response to receiving the engine start control signal, the engine is controlled to start, and the carbon canister solenoid valve is controlled to open, thereby ensuring precise control of fuel evaporation when the range-extended vehicle is in pure electric mode, ensuring environmental protection while reducing costs.

[0063] In one embodiment, such as Figure 6 As shown, the above method further includes steps 601 to 602.

[0064] Step 601: In response to the extended-range vehicle being in fuel filling mode and receiving a refueling and depressurization request signal output by the vehicle control equipment, the flow control valve of the medium-pressure fuel tank is opened.

[0065] Step 602: Obtain the oil tank pressure and determine whether the refueling and pressure relief are complete based on the oil tank pressure.

[0066] Step 603: In response to the refueling and depressurization being completed, a refueling and depressurization completion signal is output to the vehicle control equipment so that the vehicle control equipment controls the fuel tank cover of the range-extended vehicle to open according to the refueling and depressurization completion signal.

[0067] Step 604: In response to the fact that refueling and depressurization are not in a completed state, a refueling and depressurization incomplete signal is output to the vehicle control equipment so that the vehicle control equipment displays a fuel tank cover operation failure information based on the refueling and depressurization incomplete signal.

[0068] The refueling and depressurization request signal is determined by the vehicle control equipment based on the vehicle's overall status when it receives the refueling start signal. This vehicle status includes P (Park), N (Neutral), R (Reverse), and D (Drive) gear positions.

[0069] Specifically, when the engine control unit 700 detects that the range-extended vehicle is in fuel filling mode and receives a refueling and depressurization request signal from the vehicle control unit, it controls the intermediate-pressure fuel tank flow control valve 600 to open. Then, it acquires the fuel tank pressure and determines whether the refueling and depressurization process is complete based on the pressure. Next, if the refueling and depressurization process is complete, it outputs a refueling and depressurization completion signal to the vehicle control unit, causing the vehicle control unit to control the fuel tank cover of the range-extended vehicle to open. Finally, if the refueling and depressurization process is not complete, it outputs a refueling and depressurization failure signal to the vehicle control unit, causing the vehicle control unit to display a fuel tank cover operation failure message, thereby improving the convenience and efficiency of fuel filling.

[0070] In this embodiment, in response to the extended-range vehicle being in refueling mode and receiving a refueling pressure relief request signal from the vehicle control device, the medium-pressure fuel tank flow control valve is opened. Then, the fuel tank pressure is acquired, and the refueling pressure relief is determined based on the pressure. Next, in response to the refueling pressure relief being completed, a refueling pressure relief completion signal is output to the vehicle control device, causing the vehicle control device to control the extended-range vehicle's fuel tank cover to open. Finally, in response to the refueling pressure relief not being completed, a refueling pressure relief not completed signal is output to the vehicle control device, causing the vehicle control device to display a fuel tank cover operation failure message, thereby improving the convenience and efficiency of refueling.

[0071] In one embodiment, such as Figure 6 As shown, the above method also includes step 605.

[0072] Step 605: In response to receiving the refueling end request signal output by the vehicle control equipment, the flow control valve of the medium-pressure fuel tank is closed.

[0073] The refueling completion request signal is determined by the vehicle control equipment based on the vehicle's overall status upon receiving the refueling shutdown signal. Specifically, when the engine control equipment 700 recognizes and receives the refueling completion request signal from the vehicle control equipment, it controls the intermediate-pressure fuel tank flow control valve to close, thereby improving the convenience and environmental friendliness of fuel refueling.

[0074] In one specific example, when the flow control valve of the medium-pressure oil tank is closed, the engine control device 700 is switched to sleep mode to improve energy efficiency. This is just a specific example, and in actual applications, it can be flexibly set according to needs, without any restrictions.

[0075] In this embodiment, in response to receiving a refueling end request signal output by the vehicle control device, the flow control valve of the medium-pressure fuel tank is closed, which improves the convenience and environmental friendliness of fuel refueling.

[0076] It should be understood that, although Figure 2-6 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2-6 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0077] Secondly, such as Figure 7 As shown, a fuel evaporation control device for a range-extended electric vehicle is provided. The fuel evaporation control method is applied to the engine control equipment of the fuel evaporation control system. The fuel evaporation control system includes engine control equipment, vehicle control equipment, medium-pressure fuel tank, high-range fuel tank pressure sensing equipment, engine, carbon canister solenoid valve, and medium-pressure fuel tank flow control valve. The above-mentioned fuel evaporation control device includes a data acquisition module 710, a start request module 720, and a start control module 730.

[0078] The data acquisition module 710 is used to acquire the fuel tank pressure collected by the high-range fuel tank pressure sensing device in response to the range-extended vehicle being in hybrid mode; the start request module 720 is used to output an engine start request signal to the vehicle control device in response to the fuel tank pressure being greater than a first pressure threshold; and the start control module 730 is used to control the engine to start in response to receiving the engine start control signal output by the vehicle control device, and to control the opening of the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve.

[0079] In one embodiment, the start-up control module 730 is further configured to obtain the engine's operating state in response to the fuel tank pressure being less than a first pressure threshold and greater than a second pressure threshold; wherein the first pressure threshold is greater than the second pressure threshold; the start-up control module 730 is further configured to control the carbon canister solenoid valve to open and obtain the carbon canister concentration in response to the operating state being the start-up state; the start-up control module 730 is further configured to control the medium-pressure fuel tank flow control valve to open in response to the carbon canister concentration being in the low concentration range; the start-up control module 730 is further configured to return to the step of obtaining the carbon canister concentration in response to the carbon canister concentration not being in the low concentration range.

[0080] In one embodiment, the start control module 730 is further configured to control the engine to start and control the intermediate pressure tank flow control valve to close in response to the tank pressure being less than a second pressure threshold.

[0081] In one embodiment, the start control module 730 is further configured to, in response to the range-extended vehicle being in pure electric mode, control the medium-pressure fuel tank flow control valve to close and acquire the fuel tank pressure; in response to the fuel tank pressure being greater than a first pressure threshold, control the medium-pressure fuel tank flow control valve to open and output an engine start request signal to the vehicle control equipment; and in response to receiving an engine start control signal, control the engine to start and control the carbon canister solenoid valve to open.

[0082] In one embodiment, the start control module 730 is further configured to control the opening of the medium-pressure fuel tank flow control valve in response to the extended-range vehicle being in fuel filling mode and receiving a refueling pressure relief request signal output by the vehicle control device; wherein, the refueling pressure relief request signal is determined by the vehicle control device based on the vehicle status of the extended-range vehicle when it receives the refueling start signal; the start control module 730 is further configured to acquire the fuel tank pressure and determine whether the refueling pressure relief is in a completed state based on the fuel tank pressure; the start control module 730 is further configured to output a refueling pressure relief completion signal to the vehicle control device in response to the refueling pressure relief being in a completed state, so that the vehicle control device controls the fuel tank cover of the extended-range vehicle to open according to the refueling pressure relief completion signal; the start control module 730 is further configured to output a refueling pressure relief incomplete signal to the vehicle control device in response to the refueling pressure relief not being in a completed state, so that the vehicle control device displays a fuel tank cover operation failure information according to the refueling pressure relief incomplete signal.

[0083] In one embodiment, the start control module 730 is further configured to control the medium-pressure fuel tank flow control valve to close in response to receiving a refueling end request signal output by the vehicle control device; wherein the refueling end request signal is determined by the vehicle control device based on the vehicle status of the range-extended vehicle when it receives the refueling end signal.

[0084] Specific limitations regarding the fuel evaporation control device for range-extended electric vehicles can be found in the above description of the fuel evaporation control method for range-extended electric vehicles, and will not be repeated here. Each module in the aforementioned fuel evaporation control device for range-extended electric vehicles can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0085] In one embodiment, an engine control device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 8As shown, the engine control device includes a processor, memory, network interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a fuel evaporation control method for a range-extended electric vehicle. The display screen of the engine control device can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the engine control device housing, or an external keyboard, touchpad, or mouse.

[0086] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the engine control device to which the present application is applied. The specific engine control device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0087] Thirdly, an engine control device is provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described in the above method embodiments.

[0088] Fourthly, such as Figure 1 As shown, a fuel evaporation control system is provided, which includes a vehicle control device 100, a medium-pressure fuel tank 200, a high-range fuel tank pressure sensor 300, an engine 400, a carbon canister solenoid valve 500, a medium-pressure fuel tank flow control valve 600, and any one of the engine control devices in the above-described embodiment 700. The engine control device 700 is electrically connected to the high-range fuel tank pressure sensor 300, the engine 400, the carbon canister solenoid valve 500, and the medium-pressure fuel tank flow control valve 600; the engine control device 700 is communicatively connected to the vehicle control device 100.

[0089] Fifthly, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of any of the methods described in the above method embodiments.

[0090] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for controlling fuel evaporation in a range-extended electric vehicle, characterized in that, The fuel evaporation control method is applied to the engine control equipment of the fuel evaporation control system; the fuel evaporation control system includes the engine control equipment, vehicle control equipment, medium-pressure fuel tank, high-range fuel tank pressure sensing equipment, engine, carbon canister solenoid valve, and medium-pressure fuel tank flow control valve; the fuel evaporation control method includes: In response to the range-extended vehicle being in hybrid mode, the fuel tank pressure collected by the high-range fuel tank pressure sensing device is acquired. In response to the fuel tank pressure exceeding a first pressure threshold, an engine start request signal is output to the vehicle control equipment; In response to receiving the engine start control signal output by the vehicle control device, the engine is started, and the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve are opened. The method further includes: In response to the fuel tank pressure being less than a first pressure threshold and greater than a second pressure threshold, the operating state of the engine is obtained; wherein the first pressure threshold is greater than the second pressure threshold; In response to the operating state being the start state, the carbon canister solenoid valve is opened, and the carbon canister concentration is obtained; In response to the carbon canister concentration being in a low concentration range, the flow control valve of the medium-pressure oil tank is opened. If the carbon canister concentration does not fall within the low concentration range, return to the step of obtaining the carbon canister concentration; In response to the range-extended vehicle being in pure electric mode, the flow control valve of the medium-pressure fuel tank is closed, and the fuel tank pressure is acquired; In response to the oil tank pressure being greater than the first pressure threshold, the medium-pressure oil tank flow control valve is opened, and the engine start request signal is output to the vehicle control equipment. In response to receiving the engine start control signal, the engine is started and the carbon canister solenoid valve is opened.

2. The method according to claim 1, characterized in that, The method further includes: In response to the extended-range vehicle being in refueling mode and receiving a refueling pressure relief request signal output by the vehicle control device, the medium-pressure fuel tank flow control valve is controlled to open; wherein, the refueling pressure relief request signal is determined by the vehicle control device based on the overall vehicle status of the extended-range vehicle when it receives the refueling start signal; Obtain the oil tank pressure and determine whether the refueling and pressure relief are complete based on the oil tank pressure; In response to the refueling and depressurization being in the completed state, a refueling and depressurization completion signal is output to the vehicle control device, so that the vehicle control device controls the fuel tank cover of the range-extended vehicle to open according to the refueling and depressurization completion signal; In response to the fact that the refueling and depressurization is not in the completed state, a refueling and depressurization incomplete signal is output to the vehicle control device, so that the vehicle control device displays the fuel tank cover operation failure information based on the refueling and depressurization incomplete signal.

3. The method according to claim 2, characterized in that, The method further includes: In response to receiving a refueling end request signal output by the vehicle control device, the medium-pressure fuel tank flow control valve is controlled to close; wherein, the refueling end request signal is determined by the vehicle control device based on the overall vehicle status of the range-extended vehicle when it receives the refueling end signal.

4. A fuel evaporation control device for a range-extended electric vehicle, characterized in that, The fuel evaporation control method for a range-extended electric vehicle according to any one of claims 1 to 3 is applied to the engine control device of the fuel evaporation control system; the fuel evaporation control system includes the engine control device, the vehicle control device, the medium-pressure fuel tank, the high-range fuel tank pressure sensing device, the engine, the carbon canister solenoid valve, and the medium-pressure fuel tank flow control valve; the fuel evaporation control device includes: The data acquisition module is used to acquire the fuel tank pressure collected by the high-range fuel tank pressure sensing device in response to the range-extended vehicle being in hybrid mode. The start request module is used to output an engine start request signal to the vehicle control device in response to the fuel tank pressure being greater than a first pressure threshold. The start control module is used to respond to the engine start control signal output by the vehicle control device, control the engine to start, and control the opening of the carbon canister solenoid valve and the medium-pressure fuel tank flow control valve. The start-up control module is further configured to: obtain the engine's operating state in response to the fuel tank pressure being less than the first pressure threshold and greater than the second pressure threshold; wherein the first pressure threshold is greater than the second pressure threshold; control the canister solenoid valve to open and obtain the canister concentration in response to the operating state being a start-up state; control the medium-pressure fuel tank flow control valve to open in response to the canister concentration being in a low concentration range; and return to the step of obtaining the canister concentration in response to the canister concentration not being in the low concentration range. The start control module is further configured to, in response to the range-extended vehicle being in pure electric mode, control the medium-pressure fuel tank flow control valve to close and acquire the fuel tank pressure; in response to the fuel tank pressure being greater than the first pressure threshold, control the medium-pressure fuel tank flow control valve to open and output the engine start request signal to the vehicle control equipment; and in response to receiving the engine start control signal, control the engine to start and control the carbon canister solenoid valve to open.

5. An engine control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

6. A fuel evaporation control system, characterized in that, The fuel evaporation control system includes a vehicle control device, a medium-pressure fuel tank, a high-range fuel tank pressure sensor, an engine, a carbon canister solenoid valve, a medium-pressure fuel tank flow control valve, and an engine control device as described in claim 5: wherein the engine control device is electrically connected to the high-range fuel tank pressure sensor, the engine, the carbon canister solenoid valve, and the medium-pressure fuel tank flow control valve; and the engine control device is communicatively connected to the vehicle control device.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

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