Fuel supply system, control method and device thereof, and vehicle

Abstract

This invention discloses a fuel supply system, its control method, device, and vehicle for supplying fuel to an engine. The fuel supply system includes a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil-gas reversing valve assembly. The control method of the fuel supply system includes: after receiving an ignition signal, acquiring the vehicle's current speed, the fuel level in the combustion chamber, and the oxygen concentration in the engine's exhaust gas; and controlling the state of the fuel outlet and air outlet based on at least one of the vehicle speed, fuel level, and oxygen concentration. This allows the fuel supply system to expel air when it mixes with fuel to enable rapid vehicle start-up, and to replenish fuel to the engine in a timely manner when fuel supply is insufficient during vehicle operation, preventing insufficient power from affecting vehicle operation and effectively improving vehicle performance and the user's driving experience.

Description

Technical Field

[0001] This invention relates to the field of vehicle fuel supply technology, and more particularly to a fuel supply system, its control method, device, and vehicle. Background Technology

[0002] When a vehicle equipped with a high-pressure direct injection system rolls off the production line for the first time at the automaker, or after repairs to parts of the fuel supply system, or after refilling when the fuel level is very low, air may enter the fuel supply system.

[0003] When fuel is compressed, the fuel pressure increases instantaneously (from 0.7 MPa to over 350 MPa). When this pressure exceeds the pressure in the high-pressure fuel line, fuel enters the high-pressure fuel line. However, when air is compressed, the pressure increase is very limited (from 0.7 MPa to below 10 MPa), and the pressure is lower than that in the high-pressure fuel line, preventing air from entering. With repeated ignition attempts, the pressure in the high-pressure fuel line gradually decreases below the pressure of the high-pressure fuel pump, at which point the air from the high-pressure fuel pump can be expelled into the high-pressure fuel line. This means that when air enters the fuel supply system, the vehicle often requires multiple ignition attempts to start, increasing starting time, wasting fuel, and potentially leading to user suspicion of vehicle malfunction and complaints. Furthermore, during vehicle operation, insufficient fuel supply can also occur due to component aging, similarly affecting vehicle operation and the user's driving experience. Summary of the Invention

[0004] This invention provides a fuel supply system and its control method, device and vehicle to solve the problem of difficulty in starting the vehicle after air enters the fuel supply system.

[0005] According to one aspect of the present invention, a control method for a fuel supply system is provided for supplying fuel to an engine. The fuel supply system includes a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil-gas reversing valve assembly. The oil-gas reversing valve assembly includes a communicating chamber, a fuel inlet, a fuel outlet, and an air outlet. The fuel inlet is connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet is connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet is connected to the intake manifold of the engine. The control method for the fuel supply system includes:

[0006] After obtaining the ignition signal, the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas are obtained.

[0007] The state of the fuel outlet and the air outlet is controlled according to at least one of the vehicle speed, the fuel level and the oxygen concentration.

[0008] Optionally, controlling the state of the fuel outlet and the air outlet based on at least one of the vehicle speed, the fuel level, and the oxygen concentration includes:

[0009] Determine whether the vehicle speed is zero;

[0010] If so, determine whether the fuel level is below the first level threshold.

[0011] If so, then control the air outlet to open and control the fuel outlet to close, and return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas.

[0012] Optionally, the control method for the fuel supply system further includes:

[0013] If, when the vehicle is stationary, it is determined that the fuel level is not lower than a first fuel level threshold, then it is determined whether the fuel level is not higher than a second fuel level threshold.

[0014] If so, determine whether the oxygen concentration is not higher than the oxygen concentration threshold.

[0015] If so, control the air outlet to open and control the fuel outlet to close; return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas;

[0016] Wherein, the second liquid level threshold is greater than the first liquid level threshold.

[0017] Optionally, the control method for the fuel supply system further includes:

[0018] If it is determined that the fuel level is not higher than the second level threshold and the oxygen concentration is higher than or equal to the oxygen concentration threshold, then both the air outlet and the fuel outlet are controlled to be open.

[0019] Return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas.

[0020] Optionally, the control method for the fuel supply system further includes:

[0021] If, when the vehicle is stationary, the fuel level is determined to be higher than or equal to a second fuel threshold, then the air outlet is controlled to close and the fuel outlet is controlled to open.

[0022] Optionally, the control method for the fuel supply system further includes:

[0023] If the vehicle speed is determined to be greater than zero, then determine whether the fuel level is lower than the first fuel level;

[0024] If so, then both the fuel outlet and the air outlet will be turned on;

[0025] If not, then the air outlet is closed and the fuel outlet is opened.

[0026] Optionally, the control method for the fuel supply system further includes:

[0027] The step of continuously acquiring the oxygen concentration in the combustion exhaust gas of the engine after controlling the air outlet to close and the fuel outlet to open;

[0028] Determine whether the current oxygen concentration is greater than the oxygen concentration threshold;

[0029] If so, then control the air outlet to be open and keep the fuel outlet open.

[0030] According to another aspect of the present invention, a control device for a fuel supply system is provided for controlling the fuel supply system to supply fuel to an engine. The fuel supply system includes a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil-gas reversing valve assembly. The oil-gas reversing valve assembly includes a communicating chamber, a fuel inlet, a fuel outlet, and an air outlet. The fuel inlet is connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet is connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet is connected to the intake manifold pipeline of the engine. The control device for the fuel supply system includes:

[0031] The information acquisition module, after acquiring the ignition signal, acquires the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas.

[0032] The control module controls the state of the fuel outlet and the air outlet based on at least one of the vehicle speed, the fuel level, and the oxygen concentration.

[0033] According to another aspect of the present invention, a fuel supply system is provided, comprising: a low-pressure fuel supply system, a high-pressure fuel supply system, an oil-gas reversing valve assembly structure, and a controller;

[0034] The oil-gas reversing valve assembly includes a connected chamber, a fuel inlet, a fuel outlet, and an air outlet; the fuel inlet is connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet is connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet is connected to the intake manifold pipeline of the engine.

[0035] The controller is used to execute the control method of the fuel supply system described above.

[0036] The fuel supply system control method provided in this embodiment of the invention, after obtaining the vehicle's ignition signal, first obtains the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas. In this way, the state of the fuel outlet and air outlet can be controlled according to at least one of the vehicle speed, fuel level, and oxygen concentration. This enables the fuel supply system to expel air when it mixes with fuel to enable the vehicle to start quickly, and to replenish fuel to the engine in a timely manner when the fuel supply is insufficient during vehicle operation. This prevents insufficient power due to insufficient fuel supply from affecting the vehicle's operation, and effectively improves vehicle performance and the user's driving experience.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a fuel supply system structure provided in an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of a control method for a fuel supply system provided in an embodiment of the present invention;

[0041] Figure 3 This is a flowchart of another control method for a fuel supply system provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of a control device for a fuel supply system provided in an embodiment of the present invention. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] This invention provides a control method for a fuel supply system, used to supply fuel to an engine, which can solve the problem of difficulty in starting a vehicle after air enters the fuel supply system. The control method for the fuel supply system can be executed by a control device for the fuel supply system provided in this invention. The control device for the fuel supply system can be implemented in the form of software and / or hardware, and the control device for the fuel supply system can be configured in the controller of the fuel supply system.

[0046] Figure 1 This is a schematic diagram of a fuel supply system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the fuel supply system 10 includes a low-pressure fuel supply system 11, a high-pressure fuel supply system 12, and an oil-gas reversing valve assembly structure 13. The oil-gas reversing valve assembly structure 13 includes a connected chamber 131, a fuel inlet 132, a fuel outlet 133, and an air outlet 134. The fuel inlet 132 is connected to the fuel output pipeline of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to the fuel input pipeline of the high-pressure fuel supply system 12, and the air outlet 134 is connected to the intake manifold pipeline of the engine (not shown in the figure).

[0047] Specifically, when the fuel inlet 132 and fuel outlet 133 of the oil-gas reversing valve assembly 13 are in the open state and the air outlet is in the closed state, the low-pressure fuel supply system 11 filters the fuel and then sequentially delivers it to the high-pressure fuel supply system 12 through the fuel inlet 132 and fuel outlet 133 of the oil-gas reversing valve assembly 13. The high-pressure fuel system 12 pressurizes the fuel and pumps it into the engine to burn with air, thereby providing power. Preferably, the fuel outlet 133 is positioned lower than the air outlet 134 in the direction of gravity so that the less dense air can be discharged upwards, and the denser fuel can be delivered to the high-pressure fuel supply system 12 even at low liquid levels.

[0048] For example, refer to Figure 1 The low-pressure fuel supply system 11 includes a low-pressure fuel pump 111 and a fuel filter 112. The fuel inlet of the fuel filter 112 is connected to the fuel outlet of the low-pressure fuel pump 111. The first fuel outlet of the fuel filter 112 is connected to the fuel inlet 132 of the gas-fuel reversing valve assembly 13. The low-pressure fuel pump 111 delivers fuel from the fuel tank 14 to the fuel filter 112, which filters the fuel and then delivers it to the gas-fuel reversing valve assembly 13. The second fuel outlet of the fuel filter 112 is connected to the fuel tank 14 and is used to return excess fuel to the fuel tank 14 when there is too much fuel in the fuel filter 112.

[0049] The high-pressure fuel supply system 12 includes a high-pressure fuel pump 121, a high-pressure fuel rail 122, and fuel injectors 123. The high-pressure fuel pump 121 converts low-pressure fuel into high-pressure fuel and pumps the high-pressure fuel into the high-pressure fuel rail 122. The high-pressure fuel rail 122 distributes fuel to each fuel injector 123, so that the fuel injectors 123 inject the high-pressure fuel into the interior of the engine combustion chamber, mix it with air and burn it, thereby outputting power.

[0050] Figure 2 A flowchart illustrating a control method for a fuel supply system according to an embodiment of the present invention is provided, such as... Figure 2 As shown, the method includes:

[0051] S110. After obtaining the ignition signal, obtain the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas.

[0052] Specifically, refer to the following: Figure 1 After receiving the vehicle's ignition signal, the system first obtains the vehicle speed via a speed sensor, the fuel level in chamber 131 of the fuel-air reversing valve assembly 13 via a level sensor, and the oxygen concentration in the vehicle's exhaust gas via an oxygen concentration sensor. The vehicle speed determines the vehicle's stationary or moving state. The fuel level in chamber 131 of the fuel-air reversing valve assembly 13 determines the fuel and air quantity in the chamber. The oxygen concentration in the engine's exhaust gas determines the vehicle's current air and fuel requirements.

[0053] S120. Control the state of the fuel outlet and air outlet based on at least one of vehicle speed, fuel level and oxygen concentration.

[0054] Specifically, based on at least one of the following: the current vehicle speed, the fuel level in the chamber of the gas-fuel reversing valve assembly, and the oxygen concentration in the engine combustion exhaust gas, the air outlet and fuel outlet of the gas-fuel reversing valve assembly can be controlled to open or close. This allows the fuel supply system to expel air when it mixes with fuel to enable the vehicle to start quickly, and to replenish fuel to the engine in a timely manner when the fuel supply is insufficient during vehicle operation, preventing insufficient power due to insufficient fuel supply.

[0055] Before the vehicle is started, the fuel outlet and air outlet of the oil-gas switching valve assembly are preferably both closed, while the fuel inlet can be either open or closed.

[0056] For example, the fuel inlet, fuel outlet, and air outlet of the oil-gas phase-change valve assembly can each be equipped with corresponding valves. This allows control of the opening and closing of each port by controlling the on / off state of each valve. Alternatively, a three-way valve can be used instead of three valves, and the states of the fuel inlet, fuel outlet, and air outlet of the oil-gas phase-change valve assembly can be controlled by controlling the state of each port of the three-way valve.

[0057] The fuel supply system control method provided in this embodiment of the invention, after obtaining the vehicle's ignition signal, first obtains the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas. In this way, the state of the fuel outlet and air outlet can be controlled according to at least one of the vehicle speed, fuel level, and oxygen concentration. This enables the fuel supply system to expel air when it mixes with fuel to enable the vehicle to start quickly, and to replenish fuel to the engine in a timely manner when the fuel supply is insufficient during vehicle operation. This prevents insufficient power due to insufficient fuel supply from affecting the vehicle's operation, and effectively improves vehicle performance and the user's driving experience.

[0058] Optional, Figure 3 This is a flowchart of another control method for a fuel supply system provided in an embodiment of the present invention, such as... Figure 3 As shown,

[0059] S211. After obtaining the ignition signal, obtain the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas.

[0060] S212. Determine if the vehicle speed is zero; if yes, proceed to step S213; if no, proceed to step S223.

[0061] S213. Determine whether the fuel level is lower than the first level threshold; if yes, proceed to step S214; if no, proceed to step S215.

[0062] S214. Control the air outlet to open and control the fuel outlet to close; return to step S211.

[0063] Specifically, if the vehicle speed is determined to be zero, then the vehicle is considered stationary. At this point, the engine does not need fuel to propel the vehicle; it only needs to ensure the vehicle can start quickly. At this stage, the fuel and air levels in the chambers of the fuel-air reversing valve assembly can be assessed. If the fuel level is below the first threshold, it indicates that there is a significant amount of air in the chamber. If fuel from this chamber is supplied to the high-pressure fuel supply system, due to air's low density and inertia, air will be supplied to the high-pressure fuel system first, and then fuel will be supplied. This prevents the high-pressure fuel pump from quickly pumping fuel into the engine's combustion chamber, affecting engine starting. Based on this, when the vehicle speed is zero and the fuel level is below a first threshold, the air outlet can be opened and the fuel outlet closed. This allows air in the combustion chamber to be rapidly expelled through the air outlet by the low-pressure fuel pump. Once there is sufficient fuel in the combustion chamber, or when there is no air left, the fuel outlet can be opened to supply fuel to the high-pressure fuel supply system. This allows the high-pressure fuel supply system to quickly pump fuel into the engine's combustion chamber, enabling rapid engine start-up. Since the air outlet is connected to the engine's intake manifold, the air expelled from the combustion chamber can be delivered to the engine's combustion chamber as air to mix with the fuel for combustion. After opening the air outlet and closing the fuel outlet, vehicle speed, oxygen concentration, and fuel level can be continuously monitored to control the status of the air and fuel outlets in real time based on these parameters.

[0064] The first fuel level threshold can be set according to design requirements. It can be set according to the engine starting requirements. That is, it can detect the fuel level in the chamber when the engine cannot start within a preset time (e.g., 10s) and use the level as the first fuel level threshold. Alternatively, the height of the fuel outlet can be used as the first fuel level threshold. This embodiment of the invention does not specifically limit this.

[0065] S215. Determine whether the fuel level is not higher than the second level threshold; if yes, proceed to step S216; if no, proceed to step S219.

[0066] The second liquid level threshold is greater than the first liquid level threshold.

[0067] Specifically, with the vehicle speed at zero, if the fuel level is higher than or equal to the first fuel level threshold, it can then be determined whether the fuel level is not higher than the second fuel level threshold. The second fuel level threshold can also be set according to design requirements. For example, if the fuel level in the chamber is at either the first or second fuel level threshold, the vehicle may not start quickly, but it can start successfully within a preset time. Alternatively, the second fuel level threshold can be set higher than the fuel outlet height. If it is determined that the fuel level is not higher than the second fuel level threshold, the fuel outlet and air outlet of the oil-gas reversing valve assembly can be further controlled based on the oxygen concentration in the engine combustion exhaust.

[0068] S216. Determine whether the oxygen concentration is not higher than the first oxygen concentration threshold; if yes, proceed to step S217; if no, proceed to step S218.

[0069] S217. Control the air outlet to open and control the fuel outlet to close; return to step S211.

[0070] Specifically, when the vehicle speed is zero and the fuel level is between the first and second fuel level thresholds (including when the fuel level equals the first fuel level threshold), it can be determined whether the oxygen concentration is not higher than the first oxygen concentration threshold. The first oxygen concentration threshold can be set based on the exhaust gas concentration during normal combustion of fuel and air. When fuel and air burn normally in a proportional manner, the oxygen concentration in the engine combustion exhaust should be within a certain range. The first oxygen concentration threshold can be the upper limit of this range. If the oxygen concentration is too high, it will affect the catalytic effect of exhaust gas, which may cause the vehicle's exhaust emissions to exceed the standard. Based on this, if the oxygen concentration in the engine combustion exhaust is not higher than the first oxygen concentration threshold, it means that the air in the engine combustion chamber is within the normal range. The air outlet can be opened and the fuel outlet closed to allow the air in the chamber to be quickly transferred to the engine's combustion chamber. This allows fuel to be supplied to the high-pressure fuel supply system after the air is exhausted, so that the high-pressure fuel supply system can quickly pump fuel into the engine's combustion chamber to mix with air and burn to provide power. After controlling the air outlet to open and the fuel outlet to close, the vehicle speed, oxygen concentration, and fuel level can be continuously monitored to control the status of the air outlet and fuel outlet in real time based on these parameters.

[0071] S218. Control both the air outlet and fuel outlet to be turned on; return to step S211.

[0072] Specifically, when the vehicle speed is zero and the fuel level is between the first and second fuel level thresholds (including when the fuel level is equal to the first fuel level threshold), if the oxygen concentration in the engine combustion exhaust is higher than or equal to the first oxygen concentration threshold, it indicates that there is too much oxygen in the engine combustion chamber, which is detrimental to the catalytic conversion of exhaust gases. In this case, both the air outlet and the fuel outlet can be controlled to be open. This allows air to be discharged into the engine combustion chamber through the air outlet, while a small amount of fuel can also be supplied to the high-pressure fuel supply system through the fuel outlet. This allows the fuel to be pumped into the engine combustion chamber to burn with the air, reducing the oxygen concentration and thus preventing excessive exhaust emissions. Similarly, after controlling both the air outlet and the fuel outlet to be open, vehicle speed, oxygen concentration, and fuel level can be continuously monitored to control the status of the air outlet and fuel outlet in real time based on these parameters.

[0073] S219. Control the air outlet to close and control the fuel outlet to open.

[0074] Specifically, if the fuel level is determined to be higher than or equal to the second fuel threshold when the vehicle is stationary, it indicates that the air content in the chamber is low or even non-existent. The low-pressure fuel supply system can normally provide sufficient fuel to the high-pressure fuel system. At this time, the air outlet can be closed and the fuel outlet can be opened, so that fuel can be transferred to the high-pressure fuel system through the fuel outlet of the oil-gas reversing valve assembly. This allows the high-pressure fuel system to quickly provide high-pressure fuel to the engine for combustion, enabling the vehicle to start quickly.

[0075] S220: Continuously obtains the oxygen concentration in the engine's combustion exhaust gas.

[0076] S221. Determine whether the current oxygen concentration is greater than the oxygen concentration threshold; if yes, proceed to step S222; if no, return to step S219.

[0077] S222, Control the air outlet to be open and keep the fuel outlet open; Return to step S220.

[0078] Specifically, when the vehicle is stationary and the fuel level is above or equal to the second fuel threshold, by closing the air outlet of the oil-gas reversing valve assembly and opening the fuel outlet, the oxygen concentration in the engine combustion exhaust can be continuously monitored. If the oxygen concentration is greater than the oxygen concentration threshold, it indicates that the fuel content in the engine combustion chamber may be low due to component aging or other reasons, preventing it from undergoing an oxidation reaction with a large amount of air. In this case, while keeping the fuel outlet of the oil-gas reversing valve assembly open, its air outlet can also be opened, allowing fuel to enter the engine combustion chamber through the air outlet and the engine's intake manifold. This replenishes the engine's combustion chamber with fuel, increases air consumption, and reduces the oxygen concentration in the engine combustion exhaust, while ensuring the engine provides sufficient power for the vehicle to operate normally. After opening the air outlet while keeping the fuel outlet open, the oxygen concentration can be continuously monitored until it falls below or equals the oxygen concentration threshold, at which point the air outlet can be closed.

[0079] S223. Determine if the fuel level is lower than the first fuel level; if yes, proceed to step S224; if no, proceed to step S219.

[0080] S224. Control both the fuel outlet and air outlet to be turned on; return to step S211.

[0081] Specifically, if the vehicle speed is greater than zero, it indicates that the vehicle is in motion and requires fuel to ensure its normal operation. In this case, the fuel outlet can be forcibly opened to ensure that at least some fuel can be supplied to the high-pressure fuel supply system. Based on this, the fuel level in the chamber can be determined. If the fuel level is too low, for example, below a first fuel level, both the fuel outlet and air outlet are opened. This allows for the rapid expulsion of air while supplying fuel to the high-pressure fuel supply system, maintaining fuel level and oxygen concentration throughout the process. The air outlet is then opened when the fuel level exceeds a first fuel level threshold, and its opening or closing is controlled based on the oxygen concentration. Conversely, if the fuel level is not lower than the first fuel level, it indicates that although air is present in the chamber, fuel can still be supplied to the high-pressure fuel supply system normally. In this case, the fuel outlet can be opened while the air outlet is closed.

[0082] Similarly, after controlling the fuel outlet to be open and the air outlet to be closed, the oxygen concentration in the engine combustion exhaust can be continuously monitored. If the oxygen concentration is greater than the oxygen concentration threshold, it means that the fuel content in the engine combustion chamber is low and cannot undergo an oxidation reaction with a large amount of air. At this time, while keeping the fuel outlet of the oil-gas reversing valve assembly open, its air outlet can also be controlled to be open, so that fuel can also enter the engine combustion chamber through the air outlet and the engine's intake manifold, replenishing the engine combustion chamber with fuel, increasing air consumption, reducing the oxygen concentration in the engine combustion exhaust, and ensuring that the engine can provide enough power for the vehicle to drive normally.

[0083] Based on the same inventive concept, embodiments of the present invention also provide a control device for a fuel supply system, used to control the fuel supply system to supply fuel to an engine. This control device is used to execute the control method for a fuel supply system provided in any embodiment of the present invention. The control device can be implemented by software and / or hardware, and can be integrated into the controller of the fuel supply system provided in the embodiments of the present invention. Therefore, the control device for a fuel supply system provided in the embodiments of the present invention includes the technical features of the control method for a fuel supply system provided in any embodiment of the present invention, and can achieve the beneficial effects of the control method for a fuel supply system provided in any embodiment of the present invention. Similarities can be referred to the above description of the control method for a fuel supply system provided in the embodiments of the present invention, and will not be repeated here.

[0084] Optional, see reference Figure 1 The fuel supply system 10 includes a low-pressure fuel supply system 11, a high-pressure fuel supply system 12, and an oil-gas reversing valve assembly structure 13. The oil-gas reversing valve assembly structure 13 includes a connected chamber 131, a fuel inlet 132, a fuel outlet 133, and an air outlet 134. The fuel inlet 132 is connected to the fuel output pipeline of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to the fuel input pipeline of the high-pressure fuel supply system 12, and the air outlet 134 is connected to the intake manifold pipeline of the engine (not shown in the figure).

[0085] Based on the aforementioned fuel supply system, Figure 4 This is a schematic diagram of the structure of a control device for a fuel supply system provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the control device of the fuel supply system includes an information acquisition module 100, which acquires the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas after acquiring the ignition signal; and a control module 200, which controls the state of the fuel outlet and air outlet based on at least one of the vehicle speed, fuel level, and oxygen concentration.

[0086] The present invention is a control device for a fuel supply system provided in the embodiments. After obtaining the ignition signal of the vehicle, the device first obtains the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine combustion exhaust gas through the information acquisition module. Thus, the control module can control the state of the fuel outlet and the air outlet according to at least one of the vehicle speed, fuel level, and oxygen concentration. This enables the fuel supply system to expel air when it mixes with fuel to enable the vehicle to start quickly, and to replenish fuel to the engine in a timely manner when the fuel supply is insufficient during vehicle operation. This prevents insufficient power due to insufficient fuel supply from affecting the operation of the vehicle, and effectively improves vehicle performance and the user's driving experience.

[0087] Optionally, the control module includes a vehicle speed determination unit for determining whether the vehicle speed is zero; a first liquid level determination unit for determining whether the fuel level is lower than a first liquid level threshold when the vehicle speed determination unit determines that the vehicle speed is zero; and a first control unit for controlling the air outlet to open and the fuel outlet to close when the first liquid level determination unit determines that the fuel level is lower than the first liquid level threshold, and returning to the information acquisition module to perform the steps of acquiring the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas.

[0088] Optionally, the control module further includes a second liquid level judgment unit, used to determine whether the fuel level is not higher than a second liquid level threshold if the first liquid level judgment unit determines that the fuel level is not lower than a first liquid level threshold; a first oxygen concentration judgment unit, used to determine whether the oxygen concentration is not higher than an oxygen concentration threshold if the second liquid level judgment unit determines that the fuel level is not higher than the second liquid level threshold; and a second control unit, used to control the air outlet to open and the fuel outlet to close if the first oxygen concentration judgment unit determines that the oxygen concentration is not higher than the oxygen concentration threshold; and return to execute the steps of obtaining the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas. The second liquid level threshold is greater than the first liquid level threshold.

[0089] The control module also includes a third control unit, which controls both the air outlet and the fuel outlet to be turned on when the first oxygen concentration determination unit determines that the oxygen concentration is higher than or equal to the oxygen concentration threshold; and returns to the execution of the steps of obtaining the current vehicle speed, the fuel level in the chamber and the oxygen concentration in the engine combustion exhaust gas.

[0090] Optionally, the control module also includes a fourth control unit, which controls the air outlet to close and the fuel outlet to open when the second level judgment unit determines that the fuel level is higher than or equal to the second fuel threshold.

[0091] Optionally, the control module also includes a third liquid level judgment unit, used to determine whether the fuel level is lower than the first fuel level when the vehicle speed judgment unit determines that the vehicle speed is greater than zero; a fifth control unit, used to control both the fuel outlet and the air outlet to be open when the third liquid level judgment unit determines that the fuel level is lower than the first fuel level; and a sixth control unit, used to control the air outlet to be closed and the fuel outlet to be open when the third liquid level judgment unit determines that the fuel level is not lower than the first fuel level.

[0092] Optionally, the control module further includes an oxygen concentration acquisition unit, used to continuously acquire the oxygen concentration in the combustion exhaust gas of the engine after the fourth control unit or the sixth control unit controls the air outlet to close and controls the fuel outlet to open; a second oxygen concentration judgment unit, used to determine whether the oxygen concentration is greater than the oxygen concentration threshold; and a seventh control unit, used to control the air outlet to open and keep the fuel outlet open when the second oxygen concentration judgment unit determines that the oxygen concentration is greater than the oxygen concentration threshold.

[0093] Based on the same inventive concept, embodiments of the present invention also provide a fuel supply system, such as... Figure 1 The diagram shows a low-pressure fuel supply system 11, a high-pressure fuel supply system 12, an oil-gas reversing valve assembly 13, and a controller. The oil-gas reversing valve assembly 13 includes a connected chamber 131, a fuel inlet 132, a fuel outlet 133, and an air outlet 134. The fuel inlet 132 is connected to the fuel output pipeline of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to the fuel input pipeline of the high-pressure fuel supply system 12, and the air outlet 134 is connected to the intake manifold pipeline of an engine (not shown). The controller is used to execute the control method of the fuel supply system provided in any embodiment of the present invention. Therefore, the fuel supply system provided in this embodiment of the present invention includes the technical features of the control method of the fuel supply system provided in any embodiment of the present invention, and can achieve the beneficial effects of the control method of the fuel supply system provided in any embodiment of the present invention. Similarities can be found in the above description of the control method of the fuel supply system provided in the embodiments of the present invention, and will not be repeated here.

[0094] This invention also provides a vehicle that includes the fuel supply system provided in any embodiment of this invention. Therefore, the vehicle provided in this invention includes the technical features of the fuel supply system provided in any embodiment of this invention and can achieve the beneficial effects of the fuel supply system provided in any embodiment of this invention. Similarities can be found in the above description of the fuel supply system provided in this invention, which will not be repeated here.

[0095] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0096] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method for a fuel supply system for supplying fuel to an engine, the fuel supply system comprising a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil-gas reversing valve assembly; the oil-gas reversing valve assembly comprising a communicating chamber, a fuel inlet, a fuel outlet, and an air outlet; the fuel inlet being connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet being connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet being connected to the intake manifold pipeline of the engine, characterized in that... The control method for the fuel supply system includes: After obtaining the ignition signal, the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas are obtained. The state of the fuel outlet and the air outlet is controlled according to at least one of the vehicle speed, the fuel level and the oxygen concentration; Controlling the state of the fuel outlet and the air outlet based on at least one of the vehicle speed, the fuel level, and the oxygen concentration includes: Determine if the vehicle speed is zero; if so, determine if the fuel level is below a first level threshold; if so, control the air outlet to open and control the fuel outlet to close, then return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas. If the vehicle speed is determined to be greater than zero, then it is determined whether the fuel level is lower than the first fuel level; if so, both the fuel outlet and the air outlet are controlled to be open; if not, the air outlet is controlled to be closed and the fuel outlet is opened.

2. The control method for the fuel supply system according to claim 1, characterized in that, Also includes: If, when the vehicle is stationary, it is determined that the fuel level is not lower than a first fuel level threshold, then it is determined whether the fuel level is not higher than a second fuel level threshold. If so, determine whether the oxygen concentration is not higher than the oxygen concentration threshold. If so, control the air outlet to open and control the fuel outlet to close; return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas; Wherein, the second liquid level threshold is greater than the first liquid level threshold.

3. The control method for the fuel supply system according to claim 2, characterized in that, Also includes: If it is determined that the fuel level is not higher than the second level threshold and the oxygen concentration is higher than or equal to the oxygen concentration threshold, then both the air outlet and the fuel outlet are controlled to be open. Return to the steps of obtaining the current vehicle speed, the fuel level in the chamber, and the oxygen concentration in the engine's exhaust gas.

4. The control method for the fuel supply system according to claim 2, characterized in that, Also includes: If, when the vehicle is stationary, the fuel level is determined to be higher than or equal to a second fuel threshold, then the air outlet is controlled to close and the fuel outlet is controlled to open.

5. The control method for the fuel supply system according to claim 1 or 4, characterized in that, Also includes: The step of continuously acquiring the oxygen concentration in the combustion exhaust gas of the engine after controlling the air outlet to close and the fuel outlet to open; Determine whether the current oxygen concentration is greater than the oxygen concentration threshold; If so, then control the air outlet to be open and keep the fuel outlet open.

6. A control device for a fuel supply system, used to control the fuel supply system to supply fuel to an engine, the fuel supply system comprising a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil-gas reversing valve assembly; the oil-gas reversing valve assembly comprising a communicating chamber, a fuel inlet, a fuel outlet, and an air outlet; the fuel inlet being connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet being connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet being connected to the intake manifold pipeline of the engine, characterized in that, The control device for the fuel supply system includes: The information acquisition module, after acquiring the ignition signal, acquires the vehicle's current speed, the fuel level in the chamber, and the oxygen concentration in the engine's combustion exhaust gas. The control module controls the state of the fuel outlet and the air outlet based on at least one of the vehicle speed, the fuel level, and the oxygen concentration. The control module includes: Vehicle speed determination unit, used to determine whether the vehicle speed is zero; The first liquid level determination unit is used to determine whether the fuel level is lower than the first liquid level threshold when the vehicle speed determination unit determines that the vehicle speed is zero. The first control unit is configured to, when the first liquid level determination unit determines that the fuel level is lower than the first liquid level threshold, control the air outlet to be turned on and control the fuel outlet to be turned off, and return to the information acquisition module to perform the steps of acquiring the current vehicle speed, the fuel level in the chamber and the oxygen concentration in the combustion exhaust gas of the engine. The third liquid level determination unit is used to determine whether the fuel level is lower than the first fuel level when the vehicle speed determination unit determines that the vehicle speed is greater than zero. The fifth control unit is used to control both the fuel outlet and the air outlet to be turned on when the third liquid level determination unit determines that the fuel level is lower than the first fuel level; The sixth control unit is used to control the air outlet to close and the fuel outlet to open when the third liquid level determination unit determines that the fuel level is not lower than the first fuel level.

7. A fuel supply system, characterized in that, include: Low-pressure fuel supply system, high-pressure fuel supply system, oil-gas reversing valve assembly structure and controller; The oil-gas reversing valve assembly includes a connected chamber, a fuel inlet, a fuel outlet, and an air outlet; the fuel inlet is connected to the fuel output pipeline of the low-pressure fuel supply system, the fuel outlet is connected to the fuel input pipeline of the high-pressure fuel supply system, and the air outlet is connected to the intake manifold pipeline of the engine. The controller is used to execute the control method of the fuel supply system according to any one of claims 1 to 5.

8. A vehicle, characterized in that, Includes the fuel supply system as described in claim 7.

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