CN117514498A - Fuel supply system, control method and device thereof and vehicle - Google Patents

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

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Publication number
CN117514498A
CN117514498A CN202311575970.XA CN202311575970A CN117514498A CN 117514498 A CN117514498 A CN 117514498A CN 202311575970 A CN202311575970 A CN 202311575970A CN 117514498 A CN117514498 A CN 117514498A
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CN
China
Prior art keywords
fuel
supply system
fuel supply
outlet
oxygen concentration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311575970.XA
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Chinese (zh)
Inventor
朱立铭
夏春雨
杨文蕾
韩小强
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FAW Group Corp
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FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN202311575970.XA priority Critical patent/CN117514498A/en
Publication of CN117514498A publication Critical patent/CN117514498A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention discloses a fuel supply system, a control method and a control device thereof and a vehicle, which are used for supplying fuel to an engine, wherein the fuel supply system comprises a low-pressure fuel supply system, a high-pressure fuel supply system and an oil-gas reversing valve assembly structure; the control method of the fuel supply system comprises the following steps: after the ignition signal is obtained, the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are obtained; according to the state of at least one of the vehicle speed, the fuel liquid level and the oxygen concentration, the fuel outlet and the air outlet are controlled, so that air can be discharged when the fuel supply system mixes with air, the vehicle can be started quickly, and fuel can be timely supplied to the engine when the fuel is not supplied enough in the running process of the vehicle, the running of the vehicle cannot be influenced due to the insufficient power caused by the insufficient fuel supply, and the vehicle performance and the driving experience of a user can be effectively improved.

Description

Fuel supply system, control method and device thereof and vehicle
Technical Field
The present invention relates to the field of fuel supply technologies for vehicles, and in particular, to a fuel supply system, a control method and a device thereof, and a vehicle.
Background
Vehicles with high pressure direct injection systems are first taken off line at a garage or after components of the fuel supply system are repaired or after a small amount of fuel remains are filled, air is introduced into the fuel supply system.
When the fuel is compressed as a medium, the fuel pressure increases instantaneously (from 0.7MPa to 350MPa or more), and when the pressure is higher than the pressure of the high-pressure fuel pipe, the fuel enters the high-pressure fuel pipe. However, when air is compressed as a medium, the pressure increase is very limited (from 0.7MPa to below 10 MPa), the pressure is lower than that of the high-pressure oil pipe, and the air cannot enter the high-pressure oil pipe. With the repeated ignition of the driver, the pressure of the high-pressure oil pipe gradually drops below the pressure of the high-pressure fuel pump, and at the moment, the air of the high-pressure fuel pump can be discharged into the high-pressure oil pipe. That is, when air enters the fuel supply system, the vehicle often needs to be ignited for a plurality of times before starting, which lengthens the starting time, wastes fuel, and easily causes a user to suspects a vehicle failure, resulting in user complaints. In addition, in the running process of the vehicle, the condition of insufficient fuel supply can also exist due to the ageing of parts, and the running of the vehicle is influenced, so that the driving experience of a user is influenced.
Disclosure of Invention
The invention provides a fuel supply system, a control method and a control device thereof and a vehicle, and aims to solve the problem that the vehicle is difficult to start after air enters the fuel supply system.
According to an aspect of the present invention, there is provided a control method of a fuel supply system for supplying fuel to an engine, the fuel supply system including a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil and gas switching valve assembly structure; the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, the air outlet is connected with an air inlet manifold pipeline of the engine, and the control method of the fuel supply system comprises the following steps:
after the ignition signal is obtained, the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are obtained;
and controlling states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel level and the oxygen concentration.
Optionally, controlling the states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel level, and the oxygen concentration includes:
judging whether the vehicle speed is zero or not;
if yes, judging whether the fuel oil level is lower than a first liquid level threshold value;
if yes, the air outlet is controlled to be conducted, the fuel outlet is controlled to be closed, and the steps of acquiring the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are carried out.
Optionally, the control method of the fuel supply system further includes:
if the fuel level is determined not to be lower than a first level threshold when the vehicle is in a stationary state, judging whether the fuel level is not higher than a second level threshold;
if so, judging whether the oxygen concentration is not higher than an oxygen concentration threshold;
if yes, controlling the air outlet to be conducted and controlling the fuel outlet to be closed; returning to execute the step of acquiring the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust gas of the engine;
wherein the second liquid level threshold is greater than the first liquid level threshold.
Optionally, the control method of the fuel supply system further includes:
if the fuel oil liquid level is not higher than the second liquid level threshold value and the oxygen concentration is higher than or equal to the oxygen concentration threshold value, controlling the air outlet and the fuel oil outlet to be conducted;
and returning to the step of acquiring the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust gas of the engine.
Optionally, the control method of the fuel supply system further includes:
and if the fuel oil liquid level is determined to be higher than or equal to a second fuel oil threshold value when the vehicle is in a static state, controlling the air outlet to be closed and controlling the fuel oil outlet to be conducted.
Optionally, the control method of the fuel supply system further includes:
if the vehicle speed is determined to be greater than zero, judging whether the fuel level is lower than the first fuel level;
if yes, controlling the fuel outlet and the air outlet to be conducted;
if not, the air outlet is controlled to be closed and the fuel outlet is controlled to be conducted.
Optionally, the control method of the fuel supply system further includes:
continuously acquiring the oxygen concentration in the combustion exhaust gas of the engine after controlling the air outlet to be closed and controlling the fuel outlet to be conducted;
judging whether the current oxygen concentration is larger than an oxygen concentration threshold value or not;
if yes, the air outlet is controlled to be conducted and the fuel outlet is kept to be conducted.
According to another aspect of the present invention, there is provided a control device of a fuel supply system for controlling the fuel supply system to supply fuel to an engine, the fuel supply system including a low-pressure fuel supply system, a high-pressure fuel supply system, and an oil and gas switching valve assembly structure; the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, the air outlet is connected with an air inlet manifold pipeline of the engine, and the control device of the fuel supply system comprises:
the information acquisition module acquires the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine after acquiring the ignition signal;
and the control module is used for controlling the states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel liquid level and the oxygen concentration.
According to another aspect of the present invention, there is provided a fuel supply system including: low pressure fuel supply system, high pressure fuel supply system, oil and gas reversing valve assembly structure and controller;
the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, and the air outlet is connected with an air inlet manifold pipeline of the engine;
the controller is used for executing the control method of the fuel supply system.
According to the control method of the fuel supply system provided by the embodiment of the invention, after the ignition signal of the vehicle is acquired, the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are firstly acquired, so that the states of the fuel outlet and the air outlet can be controlled according to at least one of the speed, the fuel level and the oxygen concentration, the air can be discharged by the fuel supply system when the air is mixed in, so that the vehicle can be started quickly, the fuel can be timely supplemented to the engine when the fuel is insufficient in the running process of the vehicle, the running of the vehicle cannot be influenced due to the insufficient power caused by the insufficient fuel supply, and the vehicle performance and the driving experience of a user can be effectively improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a fuel supply system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling a fuel supply system according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method of controlling a fuel supply system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device of a fuel supply system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a control method of a fuel supply system, which is used for supplying fuel to an engine, and can solve the problem that a vehicle is difficult to start after air enters the fuel supply system.
FIG. 1 is a schematic diagram of a fuel supply system according to an embodiment of the present invention, and as shown in FIG. 1, the fuel supply system 10 includes a low-pressure fuel supply system 11, a high-pressure fuel supply system 12, and a fuel gas reversing valve assembly 13; the oil and gas reversing valve assembly structure 13 comprises a chamber 131, a fuel inlet 132, a fuel outlet 133 and an air outlet 134 which are communicated; the fuel inlet 132 is connected to a fuel outlet pipe of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to a fuel inlet pipe of the high-pressure fuel supply system 12, and the air outlet 134 is connected to an intake manifold pipe of an engine (not shown).
Specifically, when the fuel inlet 132 and the fuel outlet 133 of the oil-gas reversing valve assembly structure 13 are in a conducting state and the air outlet is in a closed state, the low-pressure fuel supply system 11 filters the fuel, and then sequentially transmits the filtered fuel to the high-pressure fuel supply system 12 through the fuel inlet 132 and the fuel outlet 133 of the oil-gas reversing valve assembly structure 13, and the high-pressure fuel system 12 pressurizes the fuel and pumps the fuel into the engine to burn with air, so that power can be provided. Wherein fuel outlet 133 is preferably positioned gravitationally lower than air outlet 134 so that less dense air can be exhausted upward and denser fuel can be delivered to high pressure fuel supply system 12 even at low levels.
Illustratively, referring to FIG. 1, low pressure fuel supply system 11 includes a low pressure fuel pump 111 and a fuel filter 112, with a fuel input of fuel filter 112 being in fluid communication with a fuel output of low pressure fuel pump 111, a first fuel output of fuel filter 112 being in fluid communication with a fuel inlet 132 of fuel operated valve assembly 13, low pressure fuel pump 111 being configured to deliver fuel from fuel tank 14 to fuel filter 112, and fuel filter 112 being configured to deliver filtered fuel to fuel operated valve assembly 13. Wherein a second fuel outlet of the fuel filter 112 is connected to the fuel tank 14 for returning excess fuel to the fuel tank 14 via the second fuel outlet when the fuel in the fuel filter 112 is excessive.
The high-pressure fuel supply system 12 includes a high-pressure fuel pump 121, a high-pressure fuel rail 122, and injectors 123, wherein the high-pressure fuel pump 121 is configured to convert low-pressure fuel into high-pressure fuel, and then pump the high-pressure fuel into the high-pressure fuel rail 122, and fuel is distributed to each injector 123 through the high-pressure fuel rail 122, so that the injectors 123 inject the high-pressure fuel into the combustion chamber of the engine, and mix with air for combustion, thereby enabling power output.
Fig. 2 is a flowchart of a control method of a fuel supply system according to an embodiment of the present invention, as shown in fig. 2, the method includes:
s110, after the ignition signal is acquired, acquiring the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine.
Specifically, referring to fig. 1 in combination, after the ignition signal of the vehicle is acquired, the vehicle speed of the vehicle may be acquired through a vehicle speed sensor, the fuel level in the chamber 131 of the oil-gas reversing valve assembly structure 13 through a level sensor, and the oxygen concentration in the exhaust gas of the vehicle may be acquired through an oxygen concentration sensor. The vehicle can be judged to be in a running state according to the speed of the vehicle, namely whether the vehicle is in a stationary state or a running state is judged. The amount of fuel and air in the chamber can be determined from the fuel level in the chamber 131 of the fuel and air reversing valve assembly 13. Based on the oxygen concentration in the combustion exhaust of the engine, the air demand and the fuel demand required for the current operation of the vehicle may be determined.
S120, controlling states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel level and the oxygen concentration.
Specifically, the air outlet and the fuel outlet of the oil-gas reversing valve assembly structure can be controlled to be conducted or closed according to at least one of the acquired speed of the current vehicle, the fuel level in the cavity of the oil-gas reversing valve assembly structure and the oxygen concentration in the combustion exhaust gas of the engine, so that the air can be discharged when the fuel supply system mixes with air, the vehicle can be started quickly, and the fuel can be timely supplemented to the engine when the fuel supply is insufficient in the running process of the vehicle, and the shortage of power caused by the insufficient fuel supply can be avoided.
Wherein, before the vehicle starts, the fuel outlet and the air outlet of the oil-gas phase change valve assembly structure are preferably in a closed state, and the fuel inlet can be in a conducting state or a closed state.
The fuel inlet, the fuel outlet and the air outlet of the oil-gas phase-change valve assembly can be respectively provided with corresponding valves, so that the on-off of each port can be controlled by controlling the on-off of each valve. Or a three-way valve can be adopted to replace three valves, and the states of the fuel inlet, the fuel outlet and the air outlet of the oil-gas phase-change valve assembly structure can be controlled by controlling the states of all ports of the three-way valve.
According to the control method of the fuel supply system provided by the embodiment of the invention, after the ignition signal of the vehicle is acquired, the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are firstly acquired, so that the states of the fuel outlet and the air outlet can be controlled according to at least one of the speed, the fuel level and the oxygen concentration, the air can be discharged by the fuel supply system when the air is mixed in, so that the vehicle can be started quickly, the fuel can be timely supplemented to the engine when the fuel is insufficient in the running process of the vehicle, the running of the vehicle cannot be influenced due to the insufficient power caused by the insufficient fuel supply, and the vehicle performance and the driving experience of a user can be effectively improved.
Alternatively, fig. 3 is a flowchart of another control method of the fuel supply system according to the embodiment of the present invention, as shown in fig. 3,
s211, after the ignition signal is acquired, acquiring the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine.
S212, judging whether the vehicle speed is zero; if yes, go to step S213; if not, step S223 is performed.
S213, judging whether the fuel level is lower than a first level threshold; if yes, go to step S214; if not, step S215 is performed.
S214, controlling the air outlet to be conducted and controlling the fuel outlet to be closed; the process returns to step S211.
Specifically, if the vehicle speed of the vehicle is determined to be zero, the vehicle is determined to be in a stationary state, and at the moment, the engine does not need fuel for driving the vehicle to run, and only the vehicle is ensured to be started quickly. At this time, the fuel oil quantity and the air quantity in the cavity of the oil-gas reversing valve assembly structure can be continuously judged. If the fuel level is below the first level threshold, this indicates that there is more air in the chamber. If the fuel in the chamber is delivered to the high-pressure fuel supply system, air is delivered to the high-pressure fuel system first and then the fuel is delivered to the fuel high-pressure system due to the low air density and low inertia. So that the high pressure fuel pump cannot quickly pump the fuel into the combustion chamber of the engine, affecting the starting of the engine. Based on this, when it is determined that the vehicle speed is zero and the fuel level is below the first level threshold, the air outlet is controlled to be turned on and the fuel outlet is controlled to be turned off so that air in the chamber is rapidly discharged from the air outlet under the action of the low-pressure fuel pump until the fuel amount in the chamber is large or the fuel outlet is controlled to be opened to supply fuel to the high-pressure fuel supply system when no air exists in the chamber, so that the high-pressure fuel supply system can rapidly pump the fuel into the combustion chamber of the engine, and the engine can be rapidly started. Since the air outlet is connected to the intake manifold of the engine, the air exhausted from the chamber can be delivered to the combustion chamber of the engine as air for mixed combustion with fuel. After the air outlet is controlled to be conducted and the fuel outlet is controlled to be closed, the speed, the oxygen concentration and the fuel liquid level can be continuously detected, so that the states of the air outlet and the fuel outlet are controlled in real time according to the speed, the oxygen concentration and the fuel liquid level.
The first fuel level threshold may be set according to the design requirement, and may be set according to the starting requirement of the engine, that is, the fuel level in the chamber when the engine cannot be started within a preset time (for example, 10 s) may be detected, and the level may be used as the first fuel level threshold, or the first fuel level threshold of the height of the fuel outlet.
S215, judging whether the fuel level is not higher than a second level threshold; if yes, go to step S216; if not, step S219 is executed.
Wherein the second liquid level threshold is greater than the first liquid level threshold.
Specifically, on the basis of the vehicle speed being zero, if the fuel liquid level is higher than or equal to the first liquid level threshold value, whether the fuel liquid level is not higher than the second liquid level threshold value can be continuously judged. The second liquid level threshold value can be set according to design requirements, for example, when the fuel in the cavity is at the first liquid level threshold value and the second liquid level threshold value, the vehicle can not be started quickly, but can be started successfully within a preset time, or the second liquid level threshold value can be set to be higher than the height of the fuel outlet. If the fuel liquid level is not higher than the second liquid level threshold, the fuel outlet and the air outlet of the oil-gas reversing valve assembly structure can be further controlled according to the oxygen concentration judgment in the combustion exhaust gas of the engine.
S216, judging whether the oxygen concentration is not higher than a first oxygen concentration threshold value; if yes, go to step S217; if not, step S218 is performed.
S217, controlling the air outlet to be conducted and controlling the fuel outlet to be closed; the process returns to step S211.
Specifically, when the vehicle speed is zero and the fuel level is between the first level threshold and the second level threshold (including the fuel level being equal to the first level threshold), it may be determined whether the oxygen concentration is not higher than the first oxygen concentration threshold. The first oxygen concentration threshold value can be set according to the concentration of the exhaust gas when the fuel oil and the air are normally combusted, the oxygen concentration in the exhaust gas of the engine is in a certain range when the fuel oil and the air are normally combusted in proportion, the first oxygen concentration threshold value can be the upper limit value of the range, and if the oxygen concentration is too high, the effect of catalyzing the exhaust gas is affected, so that the exhaust emission of a vehicle may exceed the standard. Based on the above, if the oxygen concentration in the combustion exhaust gas of the engine is not higher than the first oxygen concentration threshold, it is indicated that the air in the combustion chamber of the engine is in a normal range at this time, the air outlet is controlled to be conducted and the fuel outlet is controlled to be closed, so that the air in the chamber is quickly transferred to the combustion chamber of the engine, and thus the fuel can be provided to the high-pressure fuel supply system after the air is discharged, so that the high-pressure fuel supply system quickly pumps the fuel into the combustion chamber of the engine to be mixed with the air for combustion to provide power. After the air outlet is controlled to be conducted and the fuel outlet is controlled to be closed, the speed, the oxygen concentration and the fuel liquid level can be continuously detected, so that the states of the air outlet and the fuel outlet are controlled in real time according to the speed, the oxygen concentration and the fuel liquid level.
S218, controlling the air outlet and the fuel outlet to be communicated; the process returns to step S211.
Specifically, when the vehicle speed is zero and the fuel level is between the first level threshold and the second level threshold (including that the fuel level is equal to the first level threshold), if the oxygen concentration in the combustion exhaust gas of the engine is higher than or equal to the first oxygen concentration threshold, this indicates that the oxygen in the combustion chamber of the engine is too much, which is unfavorable for the catalytic conversion of the exhaust gas, the air outlet and the fuel outlet can be controlled to be both conducted at this time, so that when the air is discharged into the combustion chamber of the engine through the air outlet, a small amount of fuel can be provided to the high-pressure fuel supply system through the fuel outlet, so that the fuel can be pumped into the combustion chamber of the engine to combust with the air, and the oxygen concentration is reduced, so as to achieve the effect of avoiding the exceeding of the exhaust gas. Similarly, after the air outlet and the fuel outlet are controlled to be conducted, the speed, the oxygen concentration and the fuel liquid level can be continuously detected, so that the states of the air outlet and the fuel outlet are controlled in real time according to the speed, the oxygen concentration and the fuel liquid level.
S219, controlling the air outlet to be closed and controlling the fuel outlet to be conducted.
Specifically, if the fuel level is determined to be higher than or equal to the second fuel threshold when the vehicle is in a stationary state, it is indicated that the air content in the chamber is low or even no air exists, and the low-pressure fuel supply system can normally supply enough fuel to the high-pressure fuel system.
S220, continuously acquiring the oxygen concentration in the combustion exhaust gas of the engine.
S221, judging whether the current oxygen concentration is larger than an oxygen concentration threshold value; if yes, go to step S222; if not, the process returns to step S219.
S222, controlling the air outlet to be conducted and keeping the fuel outlet to be conducted; the process returns to step S220.
Specifically, when the vehicle is in a stationary state and the fuel oil level is higher than or equal to the second fuel oil threshold, after the air outlet of the oil-gas reversing valve assembly structure is controlled to be closed and the fuel oil outlet is controlled to be conducted, the oxygen concentration in the combustion exhaust gas of the engine can be continuously monitored, if the oxygen concentration is higher than the oxygen concentration threshold, the fact that the fuel oil content in the combustion chamber of the engine is low and cannot react with a large amount of air due to aging of components and the like is indicated, and the air outlet of the oil-gas reversing valve assembly structure can be controlled to be conducted on the basis that the fuel oil outlet of the oil-gas reversing valve assembly structure is kept to be conducted, so that fuel oil can enter the combustion chamber of the engine through the air outlet and an air inlet manifold of the engine, fuel oil can be supplemented to the combustion chamber of the engine, the consumption of the air is increased, the oxygen concentration in the combustion exhaust gas of the engine is reduced, and meanwhile, the engine can be ensured to provide enough power to enable the vehicle to normally run. After the air outlet is controlled to be conducted under the condition that the fuel outlet is kept to be conducted, the oxygen concentration can be continuously detected until the oxygen concentration is lower than or equal to an oxygen concentration threshold value, and the air outlet can be controlled to be closed.
S223, judging whether the fuel liquid level is lower than the first fuel liquid level; if yes, go to step S224; if not, step S219 is executed.
S224, controlling the fuel outlet and the air outlet to be communicated; the process returns to step S211.
Specifically, if the vehicle speed is greater than zero, it indicates that the vehicle is in a driving state, and fuel is required to ensure normal operation of the vehicle. The fuel outlet may be forcibly controlled to be in communication at this time so that at least part of the fuel can be supplied to the high-pressure fuel supply system. On the basis of this, the fuel level in the chamber can be determined, and if the fuel level is too low, for example below the first fuel level, both the fuel outlet and the air outlet are controlled to be turned on, so that air can be rapidly discharged while fuel is supplied to the high-pressure fuel supply system, and the fuel level and the oxygen concentration are maintained in the process, so that the air outlet is controlled to be turned on when the fuel level is above the first level threshold, and the air outlet is controlled to be turned on or off according to the oxygen concentration. If the fuel level is not lower than the first fuel level, it means that fuel can be normally supplied to the high-pressure fuel supply system despite the presence of air in the chamber, and the fuel outlet can be controlled to be turned on and the air outlet closed.
Similarly, after the fuel outlet is controlled to be conducted and the air outlet is closed, the oxygen concentration in the combustion exhaust gas of the engine can be continuously detected, if the oxygen concentration is larger than the oxygen concentration threshold value, the fuel content in the combustion chamber of the engine is smaller, oxidation reaction cannot be carried out with a large amount of air, and the air outlet of the fuel gas reversing valve assembly can be controlled to be conducted on the basis of keeping the fuel outlet of the fuel gas reversing valve assembly to be conducted, so that fuel can enter the combustion chamber of the engine through the air outlet and an air inlet manifold of the engine, fuel can be supplemented to the combustion chamber of the engine, the consumption of air is increased, the oxygen concentration in the combustion exhaust gas of the engine is reduced, and meanwhile, the engine can be ensured to provide enough power to enable a vehicle to normally run.
Based on the same inventive concept, the embodiments of the present invention further provide a control device of a fuel supply system for controlling the fuel supply system to supply fuel to an engine, where the control device of the fuel supply system is used to execute the control method of the fuel supply system provided by any embodiment of the present invention, and the control device of the fuel supply system may be implemented by software and/or hardware, and the control device of the fuel supply system may be integrated in the controller of the fuel supply system provided by any embodiment of the present invention, so that the control device of the fuel supply system provided by any embodiment of the present invention includes technical features of the control method of the fuel supply system provided by any embodiment of the present invention, and the same points may refer to the description of the control method of the fuel supply system provided by any embodiment of the present invention, and are not repeated herein.
Optionally, referring to FIG. 1, the fuel supply system 10 includes a low pressure fuel supply system 11, a high pressure fuel supply system 12, and a fuel gas reversing valve assembly 13; the oil and gas reversing valve assembly structure 13 comprises a chamber 131, a fuel inlet 132, a fuel outlet 133 and an air outlet 134 which are communicated; the fuel inlet 132 is connected to a fuel outlet pipe of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to a fuel inlet pipe of the high-pressure fuel supply system 12, and the air outlet 134 is connected to an intake manifold pipe of an engine (not shown).
Based on the above-mentioned fuel supply system, fig. 4 is a schematic structural diagram of a control device of a fuel supply system according to an embodiment of the present invention, where, as shown in fig. 4, the control device of the fuel supply system includes an information acquisition module 100, after acquiring an ignition signal, acquiring a current vehicle speed of a vehicle, a fuel level in a chamber, and an oxygen concentration in combustion exhaust gas of an engine; the control module 200 controls the states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel level, and the oxygen concentration.
The control device of the fuel supply system provided by the embodiment of the invention firstly acquires the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine through the information acquisition module after acquiring the ignition signal of the vehicle, so that the states of the fuel outlet and the air outlet can be controlled through the control module according to at least one of the speed, the fuel level and the oxygen concentration, the air can be discharged when the fuel supply system mixes with air so as to enable the vehicle to be started quickly, and the fuel can be timely supplemented to the engine when the fuel supply is insufficient in the running process of the vehicle, the running of the vehicle is not influenced due to the insufficient power of the fuel supply, and the vehicle performance and the driving experience of a user can be effectively improved.
Optionally, the control module includes a vehicle speed judging unit, configured to judge whether the vehicle speed is zero; the first liquid level judging unit is used for judging whether the liquid level of the fuel is lower than a first liquid level threshold value when the vehicle speed judging unit determines that the vehicle speed is zero; and the first control unit is used for controlling the air outlet to be conducted and controlling the fuel outlet to be closed when the first liquid level judging unit determines that the fuel liquid level is lower than the first liquid level threshold value, and returning to the information acquisition module to execute the steps of acquiring the current speed of the vehicle, the fuel liquid level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine.
Optionally, the control module further includes a second liquid level judging unit, configured to determine, when the first liquid level judging unit determines that the fuel liquid level is not lower than the first liquid level threshold, whether the fuel liquid level is not higher than the second liquid level threshold; the first oxygen concentration judging unit is used for judging whether the oxygen concentration is not higher than the oxygen concentration threshold value when the second judging unit determines that the fuel liquid level is not higher than the second liquid level threshold value; the second control unit is used for controlling the air outlet to be conducted and controlling the fuel outlet to be closed when the first oxygen concentration judging unit determines that the oxygen concentration is not higher than the oxygen concentration threshold value; the step of obtaining the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust of the engine is performed back. Wherein the second liquid level threshold is greater than the first liquid level threshold.
The control module further comprises a third control unit, and the third control unit is used for controlling the air outlet and the fuel outlet to be conducted when the first oxygen concentration judging unit determines that the oxygen concentration is higher than or equal to the oxygen concentration threshold value; the step of obtaining the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust of the engine is performed back.
Optionally, the control module further includes a fourth control unit, configured to control the air outlet to be closed and control the fuel outlet to be turned on when the second liquid level judging unit determines that the fuel liquid level is higher than or equal to the second fuel threshold.
Optionally, the control module further includes a third liquid level judging unit, configured to judge whether the fuel liquid level is lower than the first fuel liquid level when the vehicle speed judging unit determines that the vehicle speed is greater than zero; a fifth control unit, configured to control, when the third liquid level determination unit determines that the fuel liquid level is lower than the first fuel liquid level, both the fuel outlet and the air outlet to be turned on; and the sixth control unit is used for controlling the air outlet to be closed and controlling the fuel outlet to be conducted when the third liquid level judging unit determines that the fuel liquid level is not lower than the first fuel liquid level.
Optionally, the control module further comprises an oxygen concentration obtaining unit, which is used for continuously obtaining 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 be closed and the fuel outlet to be conducted; a second oxygen concentration judgment unit for judging whether the oxygen concentration is greater than an oxygen concentration threshold; and the seventh control unit is used for controlling the air outlet to be conducted and keeping the fuel outlet to be conducted when the second oxygen concentration judging unit determines that the oxygen concentration is greater than the oxygen concentration threshold value.
Based on the same inventive concept, the embodiment of the invention also provides a fuel supply system, which comprises a low-pressure fuel supply system 11, a high-pressure fuel supply system 12, an oil-gas reversing valve assembly structure 13 and a controller as shown in fig. 1; the oil and gas reversing valve assembly structure 13 comprises a chamber 131, a fuel inlet 132, a fuel outlet 133 and an air outlet 134 which are communicated; the fuel inlet 132 is connected to a fuel outlet pipe of the low-pressure fuel supply system 11, the fuel outlet 133 is connected to a fuel inlet pipe of the high-pressure fuel supply system 12, and the air outlet 134 is connected to an intake manifold pipe of an engine (not shown). The controller is used for executing the control method of the fuel supply system provided by any embodiment of the invention. Therefore, the fuel supply system provided by the embodiment of the present invention includes the technical features of the control method of the fuel supply system provided by any embodiment of the present invention, so that the beneficial effects of the control method of the fuel supply system provided by any embodiment of the present invention can be achieved, and the same points can be referred to the description of the control method of the fuel supply system provided by the embodiment of the present invention, which is not repeated here.
The embodiment of the invention also provides a vehicle comprising the fuel supply system provided by any embodiment of the invention, so that the vehicle provided by the embodiment of the invention comprises the technical characteristics of the fuel supply system provided by any embodiment of the invention, and can achieve the beneficial effects of the fuel supply system provided by any embodiment of the invention.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method of controlling 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 a fuel gas reversing valve assembly; the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, and the air outlet is connected with an air inlet manifold pipeline of the engine, and the control method of the fuel supply system is characterized by comprising the following steps:
after the ignition signal is obtained, the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are obtained;
and controlling states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel level and the oxygen concentration.
2. The control method of the fuel supply system according to claim 1, characterized in that controlling the states of the fuel outlet and the air outlet in accordance with at least one of the vehicle speed, the fuel level, and the oxygen concentration includes:
judging whether the vehicle speed is zero or not;
if yes, judging whether the fuel oil level is lower than a first liquid level threshold value;
if yes, the air outlet is controlled to be conducted, the fuel outlet is controlled to be closed, and the steps of acquiring the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine are carried out.
3. The method of controlling a fuel supply system according to claim 2, characterized by further comprising:
if the fuel level is determined not to be lower than a first level threshold when the vehicle is in a stationary state, judging whether the fuel level is not higher than a second level threshold;
if so, judging whether the oxygen concentration is not higher than an oxygen concentration threshold;
if yes, controlling the air outlet to be conducted and controlling the fuel outlet to be closed; returning to execute the step of acquiring the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust gas of the engine;
wherein the second liquid level threshold is greater than the first liquid level threshold.
4. A control method of a fuel supply system according to claim 3, characterized by further comprising:
if the fuel oil liquid level is not higher than the second liquid level threshold value and the oxygen concentration is higher than or equal to the oxygen concentration threshold value, controlling the air outlet and the fuel oil outlet to be conducted;
and returning to the step of acquiring the current speed of the vehicle, the fuel level in the chamber and the oxygen concentration in the combustion exhaust gas of the engine.
5. A control method of a fuel supply system according to claim 3, characterized by further comprising:
and if the fuel oil liquid level is determined to be higher than or equal to a second fuel oil threshold value when the vehicle is in a static state, controlling the air outlet to be closed and controlling the fuel oil outlet to be conducted.
6. The method of controlling a fuel supply system according to claim 2, characterized by further comprising:
if the vehicle speed is determined to be greater than zero, judging whether the fuel level is lower than the first fuel level;
if yes, controlling the fuel outlet and the air outlet to be conducted;
if not, the air outlet is controlled to be closed and the fuel outlet is controlled to be conducted.
7. The control method of a fuel supply system according to claim 5 or 6, characterized by further comprising:
continuously acquiring the oxygen concentration in the combustion exhaust gas of the engine after controlling the air outlet to be closed and controlling the fuel outlet to be conducted;
judging whether the current oxygen concentration is larger than an oxygen concentration threshold value or not;
if yes, the air outlet is controlled to be conducted and the fuel outlet is kept to be conducted.
8. A control device for a fuel supply system for controlling 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 a fuel gas reversing valve assembly structure; the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, and the air outlet is connected with an air inlet manifold pipeline of the engine, and the control device of the fuel supply system is characterized by comprising:
the information acquisition module acquires the current speed of the vehicle, the fuel level in the cavity and the oxygen concentration in the combustion exhaust gas of the engine after acquiring the ignition signal;
and the control module is used for controlling the states of the fuel outlet and the air outlet according to at least one of the vehicle speed, the fuel liquid level and the oxygen concentration.
9. A fuel supply system, comprising: low pressure fuel supply system, high pressure fuel supply system, oil and gas reversing valve assembly structure and controller;
the oil-gas reversing valve assembly structure comprises a cavity, a fuel inlet, a fuel outlet and an air outlet which are communicated; the fuel inlet is connected with a fuel output end pipeline of the low-pressure fuel supply system, the fuel outlet is connected with a fuel input end pipeline of the high-pressure fuel supply system, and the air outlet is connected with an air inlet manifold pipeline of the engine;
the controller is configured to execute the control method of the fuel supply system according to any one of claims 1 to 7.
10. A vehicle comprising the fuel supply system of claim 9.
CN202311575970.XA 2023-11-23 2023-11-23 Fuel supply system, control method and device thereof and vehicle Pending CN117514498A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311575970.XA CN117514498A (en) 2023-11-23 2023-11-23 Fuel supply system, control method and device thereof and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311575970.XA CN117514498A (en) 2023-11-23 2023-11-23 Fuel supply system, control method and device thereof and vehicle

Publications (1)

Publication Number Publication Date
CN117514498A true CN117514498A (en) 2024-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN117514498A (en)

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