CN116335859A - Engine fuel supply system and control method - Google Patents
Engine fuel supply system and control method Download PDFInfo
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- CN116335859A CN116335859A CN202310581959.8A CN202310581959A CN116335859A CN 116335859 A CN116335859 A CN 116335859A CN 202310581959 A CN202310581959 A CN 202310581959A CN 116335859 A CN116335859 A CN 116335859A
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- fuel
- fuel supply
- relief valve
- pressure relief
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- 239000000446 fuel Substances 0.000 title claims abstract description 394
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009834 vaporization Methods 0.000 claims abstract description 86
- 230000008016 vaporization Effects 0.000 claims abstract description 85
- 239000013589 supplement Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 87
- 239000007788 liquid Substances 0.000 description 31
- 238000002347 injection Methods 0.000 description 21
- 239000007924 injection Substances 0.000 description 21
- 238000009835 boiling Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 less than 64.5 °C Chemical compound 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
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Classifications
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
-
- 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
- F02M37/04—Feeding by means of driven pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to an engine fuel supply system and a control method. The method comprises the following steps: controlling an open/close state of the pressure release valve based on a vaporization state of the fuel in the fuel supply line; wherein the pressure relief valve is arranged on the fuel supply pipeline; and under the condition that the pressure relief valve is in an open state, controlling the opening time of the pressure relief valve to be a first time length if the engine load is larger than a first preset load, controlling the opening time of the pressure relief valve to be a second time length if the engine load is smaller than a second preset load, discharging fuel in the fuel supply pipeline through the pressure relief valve, and controlling the fuel quantity entering the fuel supply pipeline to supplement the fuel in the fuel supply pipeline. The invention can reduce the possibility of air lock and avoid the phenomenon of insufficient oil supply or interruption of the engine.
Description
Technical Field
The invention relates to the technical field of engine fuel supply, in particular to an engine fuel supply system and a control method.
Background
Engine fuels come in a variety of forms, methanol being increasingly valued for its properties of carbon neutralization and its renewable nature. Methanol is used as fuel for vehicle engines, and because methanol has a low boiling point of only 64.5 ℃, methanol is vaporized when encountering local hot spots. When the vaporization amount is too large, air lock phenomenon may occur, and the influence of the air lock may cause inaccurate fuel injection metering of the engine, so that the problem of insufficient fuel supply or interruption of the engine is generated.
Disclosure of Invention
The invention provides an engine fuel supply system and a control method, which can reduce the possibility of air lock and avoid the phenomenon of insufficient or interrupted engine fuel supply.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides an engine fuel supply control method, which comprises the following steps:
controlling an open/close state of the pressure release valve based on a vaporization state of the fuel in the fuel supply line; wherein the pressure relief valve is provided on the fuel supply line;
when the pressure relief valve is in an open state, controlling the open time of the pressure relief valve to be a first time when the engine load is larger than a first preset load, controlling the open time of the pressure relief valve to be a second time when the engine load is smaller than a second preset load, and controlling the fuel in the fuel supply pipeline to be discharged through the pressure relief valve so as to supplement the fuel in the fuel supply pipeline;
wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is greater than the second preset load, if the engine load is greater than or equal to the second preset load and the engine load is less than or equal to the first preset load, controlling the opening duration of the pressure relief valve to be a third duration, wherein the third duration is greater than the first duration and the third duration is less than the second duration.
Optionally, the method further comprises:
and controlling the pressure of the fuel entering the fuel supply pipeline under the condition that the pressure relief valve is in an open state so as to keep the pressure of the fuel in the fuel supply pipeline within a preset pressure range.
Optionally, the controlling the opening and closing states of the pressure relief valve based on the vaporization state of the fuel in the fuel supply line includes:
when the vaporization state of the fuel in the fuel supply pipeline is the first vaporization state, controlling the pressure relief valve to be in a closed state;
when the vaporization state of the fuel in the fuel supply pipeline is the second vaporization state, controlling the pressure relief valve to be in an open state;
wherein the amount of vaporization of the fuel in the first vaporized state in the fuel supply line is less than the amount of vaporization of the fuel in the second vaporized state in the fuel supply line.
Optionally, before the controlling the opening and closing states of the pressure relief valve based on the vaporization state of the fuel in the fuel supply line, the method further includes:
determining a temperature of fuel in the fuel supply line;
determining that the vaporization state of the fuel in the fuel supply line is the first vaporization state in the case where the temperature of the fuel in the fuel supply line is less than a preset temperature;
and determining the vaporization state of the fuel in the fuel supply pipeline to be the second vaporization state under the condition that the temperature of the fuel in the fuel supply pipeline is larger than a preset temperature.
The present invention also provides an engine fuel supply system comprising:
a controller, a pressure relief valve and a fuel supply line;
the pressure relief valve is arranged on the fuel supply pipeline;
the pressure release valve is controlled by the controller;
the controller is used for controlling the opening and closing states of the pressure relief valve based on the vaporization state of the fuel in the fuel supply pipeline, and controlling the fuel quantity entering the fuel supply pipeline to supplement the fuel in the fuel supply pipeline under the condition that the pressure relief valve is in an opened state and the fuel in the fuel supply pipeline is discharged through the pressure relief valve;
the controller is further configured to control an opening duration of the pressure relief valve to be a first duration if the engine load is greater than a first preset load and to control the opening duration of the pressure relief valve to be a second duration if the engine load is less than a second preset load when the pressure relief valve is in an open state;
wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is greater than the second preset load, if the engine load is greater than or equal to the second preset load and the engine load is less than or equal to the first preset load, controlling the opening duration of the pressure relief valve to be a third duration, wherein the third duration is greater than the first duration and the third duration is less than the second duration.
Optionally, the method further comprises:
a gas collecting channel;
one end of the gas collection channel is provided with the pressure relief valve, and the other end of the gas collection channel is communicated with the fuel supply pipeline;
with the pressure relief valve in a closed state, at least partially vaporized fuel is located in the gas collection channel.
Optionally, the method further comprises:
a supply pump;
the feed pump is communicated with the fuel feed pipeline;
the feed pump is controlled by the controller;
the controller is used for controlling the pressure of the feed pump under the condition that the pressure relief valve is in an open state so as to keep the pressure of the fuel in the fuel feed pipeline within a preset pressure range.
As can be seen from the above technical solution, the present invention discloses an engine fuel supply system and a control method, wherein the open/close state of a pressure relief valve is controlled based on the vaporization state of fuel in a fuel supply pipeline, and when the pressure relief valve is in the open state, if the engine load is greater than a first preset load, the open duration of the pressure relief valve is controlled to be a first duration, and if the engine load is less than a second preset load, the open duration of the pressure relief valve is controlled to be a second duration, the fuel in the fuel supply pipeline is discharged through the pressure relief valve, and the fuel amount entering the fuel supply pipeline is controlled to supplement the fuel in the fuel supply pipeline. According to the invention, vaporized fuel can be discharged by controlling the opening of the pressure relief valve, so that the occurrence of air lock is reduced, and the temperature of the fuel in the fuel supply pipeline can be reduced by controlling the quantity of the fuel entering the fuel supply pipeline, so that the occurrence of air lock is further reduced, and the problem of inaccurate fuel injection metering of an engine, which is caused by the influence of air lock, is avoided, and the problem of insufficient or interrupted fuel supply of the engine is further generated.
Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the above advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an engine fueling control method provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of an engine fuel delivery system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of connection of an engine fuel supply control circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Methanol is used as engine fuel, and is easy to generate air lock phenomenon due to the low boiling point. The air resistance refers to that the fuel conveying pipeline blocks an oil path due to gas generated by high temperature, so that the oil supply of a transmitter is not smooth, and a vehicle can be flameout when serious. When the vaporization amount of methanol is large, gas is mixed in methanol at the time of fuel injection, the amount of fuel injected at a fixed injection time is lower than that injected when the gas is not contained, and when the vaporization amount of methanol is large, the excessive gas reduces the flow rate of fuel, and the amount of fuel injected at a fixed injection time is lower than that injected when the gas is not contained, so that the fuel injection metering of an engine is inaccurate, resulting in the problem of insufficient or interrupted fuel supply of the engine.
At present, in order to alleviate the occurrence of methanol vapor lock, the boiling point of methanol is improved by adopting a mode of adding an additive, but the boiling point is improved to a limited extent, meanwhile, the additive contains more metal elements, and pollution emission is generated after combustion, so that a certain emission risk exists.
Based on this, the present invention provides an engine fuel supply control method, as shown in fig. 1, comprising:
step 101: controlling an open/close state of the pressure release valve based on a vaporization state of the fuel in the fuel supply line; wherein the pressure relief valve is arranged on the fuel supply pipeline.
An engine fuel, which may be methanol, is stored in the fuel supply line, the methanol being in a liquid state at a relatively low temperature, e.g. below the boiling point of methanol. The fuel supply pipeline is communicated with the liquid inlet pipeline and the liquid outlet pipeline, the fuel supply pump conveys the methanol fuel to the fuel supply pipeline through the liquid inlet pipeline for storage, and when the methanol fuel needs to be provided, the methanol fuel stored in the fuel supply pipeline is injected into the engine through the liquid outlet pipeline. The fuel supply line may be a chamber having a hollow structure, and the shape of the fuel supply line is not particularly limited herein.
Since the vapor lock phenomenon is more likely to occur as the amount of vaporization of the fuel increases, the present invention can determine the vaporization state of the fuel in order to avoid occurrence of the vapor lock phenomenon, and determine whether or not to require the exhaust gas in order to reduce the amount of gas in the fuel supply line according to the vaporization state of the fuel. The pressure relief valve is arranged on the fuel supply pipeline, and the pressure inside the fuel supply pipeline is larger than the pressure outside the fuel supply pipeline, so that after the pressure relief valve is opened, the gas in the fuel supply pipeline flows in the direction of small pressure, and vaporized fuel can be discharged out of the fuel supply pipeline through the pressure relief valve, so that the gas quantity in the fuel supply pipeline is reduced, and the occurrence probability of air resistance is further reduced.
The vaporization state of the fuel can be reflected by the vaporization amount of the fuel. The hydraulic valve can be controlled to be closed when the fuel vaporization amount in the fuel supply pipeline is small, and the hydraulic valve can be controlled to be opened when the fuel vaporization amount is large, so that air resistance is avoided when the gas is large.
As an alternative embodiment, controlling the open/close state of the pressure release valve based on the vaporization state of the fuel in the fuel supply line includes:
when the vaporization state of the fuel in the fuel supply pipeline is the first vaporization state, controlling the pressure relief valve to be in a closed state;
when the vaporization state of the fuel in the fuel supply pipeline is the second vaporization state, controlling the pressure relief valve to be in an open state;
wherein the amount of vaporization of the fuel in the first vaporized state in the fuel supply line is less than the amount of vaporization of the fuel in the second vaporized state in the fuel supply line.
The fuel in the fuel supply line is in the first vaporised state, i.e. the vaporisation is less, and there is less likelihood of gas lock from small amounts of gas, at which point the pressure relief valve can be controlled to be in a closed state. When the fuel in the fuel supply pipeline is in the second vaporization state, namely the vaporization amount is large, the possibility of generating air resistance of more gas is high, and the pressure relief valve can be controlled to be in an open state.
The vaporization state of the fuel may also be reflected by the temperature of the fuel. The control hydraulic valve is closed when the fuel temperature in the fuel supply line is low, and is opened when the fuel temperature is high. The fuel temperature may be compared with a temperature threshold, and when the fuel temperature is less than the temperature threshold, the fuel vaporization amount may be kept small, and when the fuel temperature is greater than the temperature threshold, the fuel vaporization amount may be large, and in order to prevent occurrence of air lock, the pressure release valve may be controlled to be opened so that gas is discharged from the fuel supply line through the hydraulic valve. The temperature threshold may be less than or equal to the fuel boiling temperature.
As an alternative embodiment, before controlling the open/close state of the pressure relief valve based on the vaporization state of the fuel in the fuel supply line, the method further includes:
determining a temperature of fuel in the fuel supply line;
determining the vaporization state of the fuel in the fuel supply line as a first vaporization state in the case where the temperature of the fuel in the fuel supply line is less than a preset temperature;
and determining the vaporization state of the fuel in the fuel supply line to be a second vaporization state in the case where the temperature of the fuel in the fuel supply line is greater than the preset temperature.
Alternatively, when the fuel in the fuel supply line is methanol, the boiling point of the methanol is 64.5 ℃, and the preset temperature may be the boiling point of the methanol, that is, 64.5 ℃. Of course, in order to reduce the risk of vaporization, the preset temperature may be less than the boiling point of methanol, i.e. less than 64.5 ℃, for example, 60 ℃ is selected as the preset temperature, and the preset temperature value may be determined according to the practical application, which is not limited herein.
When the fuel temperature in the fuel supply line is low, the possibility of vaporization of the fuel is low, the generated vaporization amount is small, the vaporization state of the fuel can be determined to be the first vaporization state, the possibility of occurrence of vapor lock in the vaporization state is also low, and at this time, the pressure release valve can be controlled to be in the closed state. When the fuel temperature in the fuel supply line is high, the possibility of vaporization of the fuel is high, the generated vaporization amount is large, the vaporization state of the fuel can be determined to be the second vaporization state, the possibility of occurrence of vapor lock in the vaporization state is high, and at this time, the pressure release valve can be controlled to be in an open state.
Alternatively, the present invention may control the open/close state of the pressure release valve directly based on the temperature of the fuel in the fuel supply line. Controlling the pressure relief valve to be in a closed state under the condition that the temperature of fuel in the fuel supply pipeline is smaller than a preset temperature; and controlling the pressure relief valve to be in an open state under the condition that the temperature of fuel in the fuel supply pipeline is higher than a preset temperature.
The specific value of the preset temperature may be described above, and will not be described herein.
As an optional implementation manner, in order to better reduce the occurrence of the air lock phenomenon when the pressure release valve is in the closed state, a gas collecting channel may be disposed on the fuel supply pipeline, where the gas collecting channel may be disposed on the opposite side of the liquid outlet pipeline, that is, the methanol fuel is located on the liquid outlet pipeline side, and the gas collecting channel is disposed on the opposite side of the liquid outlet pipeline, so that the gas collecting channel does not store liquid methanol fuel, but can collect vaporized methanol in a concentrated manner, without affecting injection of the methanol fuel. The pressure release valve can be arranged at one end of the gas collection channel, the other end of the gas collection channel is communicated with the fuel supply pipeline, and when the hydraulic valve is in a closed state, vaporized fuel is positioned in the gas collection channel.
Step 102: and under the condition that the pressure relief valve is in an open state, controlling the opening time of the pressure relief valve to be a first time length if the engine load is larger than a first preset load, controlling the opening time of the pressure relief valve to be a second time length if the engine load is smaller than a second preset load, discharging fuel in the fuel supply pipeline through the pressure relief valve, and controlling the fuel quantity entering the fuel supply pipeline to supplement the fuel in the fuel supply pipeline.
Wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is larger than the second preset load, if the engine load is larger than or equal to the second preset load and the engine load is smaller than or equal to the first preset load, controlling the opening duration of the pressure release valve to be third duration, wherein the third duration is longer than the first duration and the third duration is shorter than the second duration.
Because the pressure in the fuel supply pipeline is larger than the pressure outside the fuel supply pipeline, after the pressure relief valve is opened, the fuel in the fuel supply pipeline can flow in the direction of small pressure, and the gas fuel and the liquid fuel can be discharged out of the fuel supply pipeline through the pressure relief valve. When the fuel temperature is reduced and is lower than the boiling point temperature of the fuel, the vaporization amount of the fuel is reduced, and the reduction of the vaporization amount of the fuel is beneficial to reducing the possibility of occurrence of air lock, so that the problem of inaccurate fuel injection metering of an engine caused by the influence of the air lock is avoided, and the problem of insufficient or interrupted fuel supply of the engine is further solved.
When the engine load is large, that is, when the engine load is larger than the first preset load, the fuel injection amount is large, the fuel stored in the fuel supply pipeline is small after the fuel is injected through the liquid outlet pipeline, the fuel amount required to be supplemented to the fuel supply pipeline is relatively large when the fuel amount is small, the fuel temperature can be quickly reduced through more liquid newly supplemented to the fuel supply pipeline, when the fuel temperature is low, the fuel vaporization amount is low, the possibility of occurrence of air lock is small, therefore, the time for discharging the fuel in a gas-liquid mixed state through the pressure relief valve can be short, and particularly the opening duration of the pressure relief valve can be controlled to be the first duration.
When the engine load is small, that is, when the engine load is smaller than a second preset load, the fuel injection amount is small, after fuel is injected through the liquid outlet pipeline, the fuel amount stored in the fuel supply pipeline is large, and when the fuel amount is large, the fuel amount required to be supplemented to the fuel supply pipeline is relatively small, and the effect of reducing the fuel temperature by the small newly-supplemented liquid in the fuel supply pipeline is poor, so that the fuel in a gas-liquid mixing state can be further discharged by prolonging the opening time of the pressure release valve, the gas content in the fuel supply pipeline is reduced, and the opening time of the pressure release valve can be controlled to be specifically a second time period which is longer than the first time period. Meanwhile, as the fuel in the fuel supply pipeline flows out from the pressure relief valve, the amount of the fuel fed into the fuel supply pipeline can be increased, and the high-temperature fuel in the fuel supply pipeline can be replaced, so that the temperature of the fuel is further reduced through the low-temperature supplemental fuel, and the possibility of air lock is reduced.
As an alternative embodiment, the present invention provides an engine fuel supply control method, further comprising:
with the pressure relief valve in an open state, the pressure of the fuel entering the fuel supply line is controlled to maintain the pressure of the fuel in the fuel supply line within a preset pressure range.
After the hydraulic valve is opened, the fuel in the fuel supply pipeline is discharged out of the fuel supply pipeline through the hydraulic valve, so that the pressure of the liquid fuel in the fuel supply pipeline is reduced, and the injection quantity and the fuel pressure have a certain corresponding relation, so that the injection quantity is influenced after the fuel pressure is reduced. The invention can control the pressure of the fuel entering the fuel supply pipeline under the condition that the pressure relief valve is in an open state so as to keep the pressure of the fuel in the fuel supply pipeline within a preset pressure range. When the fuel pressure is within the preset pressure range, the corresponding injection quantity can meet the injection quantity requirement.
In practical application, when the pressure release valve is in an open state, the pressure of fuel entering the fuel supply pipeline can be increased, specifically, the pressure can be increased to 1.05 times of the normal pressure, the ratio of the supply pressure to the normal pressure can be determined according to practical conditions, and the pressure is not limited herein.
The present invention also provides an engine fuel supply system comprising:
a controller, a pressure relief valve and a fuel supply line.
The relief valve is provided on the fuel supply line.
The pressure relief valve is controlled by the controller.
The controller is configured to control an open/close state of the pressure release valve based on a vaporization state of the fuel in the fuel supply line, and to control an amount of the fuel entering the fuel supply line to replenish the fuel in the fuel supply line in a case where the pressure release valve is in an open state and the fuel in the fuel supply line is discharged through the pressure release valve.
Optionally, the controller is further configured to control the opening duration of the pressure relief valve to be a first duration if the engine load is greater than a first preset load and to control the opening duration of the pressure relief valve to be a second duration if the engine load is less than a second preset load when the pressure relief valve is in an open state.
Wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is larger than the second preset load, if the engine load is larger than or equal to the second preset load and the engine load is smaller than or equal to the first preset load, controlling the opening duration of the pressure release valve to be third duration, wherein the third duration is longer than the first duration and the third duration is shorter than the second duration.
Optionally, the controller is further configured to determine a temperature of the fuel in the fuel supply line; and determining the vaporization state of the fuel in the fuel supply line as a first vaporization state in the case that the temperature of the fuel in the fuel supply line is less than a preset temperature; and determining the vaporization state of the fuel in the fuel supply line to be a second vaporization state in the case where the temperature of the fuel in the fuel supply line is greater than the preset temperature.
The controller is also used for controlling the pressure relief valve to be in a closed state when the vaporization state of the fuel in the fuel supply pipeline is the first vaporization state; when the vaporization state of the fuel in the fuel supply pipeline is the second vaporization state, controlling the pressure relief valve to be in an open state; wherein the amount of vaporization of the fuel in the first vaporized state in the fuel supply line is less than the amount of vaporization of the fuel in the second vaporized state in the fuel supply line.
As an alternative embodiment, the present invention provides an engine fuel supply system, further comprising:
and a gas collecting channel.
One end of the gas collecting channel is provided with a pressure relief valve, and the other end of the gas collecting channel is communicated with the fuel supply pipeline.
With the pressure relief valve in a closed state, at least partially vaporized fuel is located in the gas collection channel.
In order to better reduce the occurrence of the air lock phenomenon when the pressure release valve is in a closed state, a gas collecting channel can be arranged on the fuel supply pipeline, the gas collecting channel can be arranged on the opposite side of the liquid outlet pipeline, namely, the methanol fuel is positioned on the liquid outlet pipeline side, and the gas collecting channel is arranged on the opposite side of the liquid outlet pipeline, so that the liquid methanol fuel is not stored in the gas collecting channel, and the vaporized methanol can be collected in a concentrated mode without influencing the injection of the methanol fuel. When the hydraulic valve is in a closed state, the vaporized fuel is positioned in the gas collecting channel, and the gas collecting channel is increased, so that the storage space of the vaporized fuel is enlarged, and the gas mixed into the methanol liquid can be reduced, thereby reducing the occurrence probability of gas lock.
As another alternative embodiment, the present invention provides an engine fuel supply system, further comprising:
and a supply pump.
The feed pump communicates with the fuel feed line.
The feed pump is controlled by a controller.
The controller is used for controlling the pressure of the feed pump to keep the pressure of the fuel in the fuel feed pipeline within a preset pressure range under the condition that the pressure relief valve is in an open state.
After the hydraulic valve is opened, the fuel in the fuel supply pipeline is discharged out of the fuel supply pipeline through the hydraulic valve, so that the pressure of the liquid fuel in the fuel supply pipeline is reduced, and the injection quantity and the fuel pressure have a certain corresponding relation, so that the injection quantity is influenced after the fuel pressure is reduced. The invention can control the pressure of the feed pump, namely the pressure of the fuel entering the fuel feed pipeline under the condition that the pressure relief valve is in an open state, so as to keep the pressure of the fuel in the fuel feed pipeline within a preset pressure range, thereby meeting the injection quantity requirement.
As shown in fig. 2, fuel is fed from a feed pump 21 into a liquid feed line 22, one end of which communicates with a fuel feed line 23, and the other end of which is connected to the fuel feed pump. The fuel introduced into the fuel supply line is injected into the engine (not shown) through the liquid outlet line 25 after the injection valve (not shown) connected to the liquid outlet line is opened. When the temperature of the fuel in the fuel supply line increases, the gas generated after the vaporization of the fuel may be concentrated in the gas collection passage 26, and when the temperature increases and exceeds a preset temperature, the controller controls the relief valve 24 provided at one end of the gas collection passage to open, and the fuel flows out of the fuel supply line and may be collected in a fuel tank (not shown) that stores the engine fuel. With the outflow of the fuel, the liquid amount in the fuel supply pipeline is reduced, in order to ensure that the liquid pressure is in a preset pressure range and the injection amount is not influenced, the controller controls the supply pump to increase the supply pressure, the supply pump supplies fuel to the fuel supply pipeline through the liquid inlet pipeline after the fuel is pumped from the fuel tank, at the moment, the temperature of the supplied fuel is smaller than the temperature of the fuel in the fuel supply pipeline, and the possibility of fuel vaporization is reduced after the temperature is reduced, so that the occurrence of air resistance is reduced.
Optionally, the invention may provide a data collector, which may include a temperature sensor, a probe of the temperature sensor being located in the fuel supply line, the temperature sensor being configured to detect a liquid fuel temperature, and to control the pressure relief valve to be in a closed state when the fuel temperature is below a preset temperature, and to control the hydraulic valve to be in an open state when the fuel temperature is above the preset temperature.
Optionally, the data collector of the present invention may further include a pressure sensor, the probe of the pressure sensor being also located in the fuel supply line, the pressure sensor being configured to detect a liquid fuel pressure, and to control the supply pressure of the supply pump to maintain the fuel pressure in the fuel supply line within a preset pressure range when the fuel pressure is not within the preset pressure range.
The connection schematic diagram of the engine fuel supply control circuit provided by the invention is shown in fig. 3, and the data collector 27, the pressure release valve 24 and the supply pump 21 are all connected with the controller 28. Alternatively, the injection valve may be connected to the controller.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An engine fuel supply control method, characterized by comprising:
controlling an open/close state of the pressure release valve based on a vaporization state of the fuel in the fuel supply line; wherein the pressure relief valve is provided on the fuel supply line;
when the pressure relief valve is in an open state, controlling the open time of the pressure relief valve to be a first time when the engine load is larger than a first preset load, controlling the open time of the pressure relief valve to be a second time when the engine load is smaller than a second preset load, and controlling the fuel in the fuel supply pipeline to be discharged through the pressure relief valve so as to supplement the fuel in the fuel supply pipeline;
wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is greater than the second preset load, if the engine load is greater than or equal to the second preset load and the engine load is less than or equal to the first preset load, controlling the opening duration of the pressure relief valve to be a third duration, wherein the third duration is greater than the first duration and the third duration is less than the second duration.
2. The engine fuel supply control method according to claim 1, characterized by further comprising:
and controlling the pressure of the fuel entering the fuel supply pipeline under the condition that the pressure relief valve is in an open state so as to keep the pressure of the fuel in the fuel supply pipeline within a preset pressure range.
3. The engine fuel supply control method according to claim 1 or 2, characterized in that the controlling the opening and closing states of the relief valve based on the vaporization state of the fuel in the fuel supply line includes:
when the vaporization state of the fuel in the fuel supply pipeline is the first vaporization state, controlling the pressure relief valve to be in a closed state;
when the vaporization state of the fuel in the fuel supply pipeline is the second vaporization state, controlling the pressure relief valve to be in an open state;
wherein the amount of vaporization of the fuel in the first vaporized state in the fuel supply line is less than the amount of vaporization of the fuel in the second vaporized state in the fuel supply line.
4. The engine fuel supply control method according to claim 3, characterized in that before the control of the open/close state of the pressure release valve based on the vaporization state of the fuel in the fuel supply line, the method further comprises:
determining a temperature of fuel in the fuel supply line;
determining that the vaporization state of the fuel in the fuel supply line is the first vaporization state in the case where the temperature of the fuel in the fuel supply line is less than a preset temperature;
and determining the vaporization state of the fuel in the fuel supply pipeline to be the second vaporization state under the condition that the temperature of the fuel in the fuel supply pipeline is larger than the preset temperature.
5. An engine fuel delivery system, comprising:
a controller, a pressure relief valve and a fuel supply line;
the pressure relief valve is arranged on the fuel supply pipeline;
the pressure release valve is controlled by the controller;
the controller is used for controlling the opening and closing states of the pressure relief valve based on the vaporization state of the fuel in the fuel supply pipeline, and controlling the fuel quantity entering the fuel supply pipeline to supplement the fuel in the fuel supply pipeline under the condition that the pressure relief valve is in an opened state and the fuel in the fuel supply pipeline is discharged through the pressure relief valve;
the controller is further configured to control an opening duration of the pressure relief valve to be a first duration if the engine load is greater than a first preset load and to control the opening duration of the pressure relief valve to be a second duration if the engine load is less than a second preset load when the pressure relief valve is in an open state;
wherein the first preset load is not less than the second preset load, and the first time period is less than the second time period; when the first preset load is greater than the second preset load, if the engine load is greater than or equal to the second preset load and the engine load is less than or equal to the first preset load, controlling the opening duration of the pressure relief valve to be a third duration, wherein the third duration is greater than the first duration and the third duration is less than the second duration.
6. The engine fuel delivery system of claim 5, further comprising:
a gas collecting channel;
one end of the gas collection channel is provided with the pressure relief valve, and the other end of the gas collection channel is communicated with the fuel supply pipeline;
with the pressure relief valve in a closed state, at least partially vaporized fuel is located in the gas collection channel.
7. The engine fuel supply system according to claim 5 or 6, characterized by further comprising:
a supply pump;
the feed pump is communicated with the fuel feed pipeline;
the feed pump is controlled by the controller;
the controller is used for controlling the pressure of the feed pump under the condition that the pressure relief valve is in an open state so as to keep the pressure of the fuel in the fuel feed pipeline within a preset pressure range.
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| CN202310581959.8A CN116335859B (en) | 2023-05-23 | 2023-05-23 | Engine fuel supply system and control method |
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