CN113389648B - Leakage detection device of high-pressure fuel system - Google Patents
Leakage detection device of high-pressure fuel system Download PDFInfo
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- CN113389648B CN113389648B CN202110852232.XA CN202110852232A CN113389648B CN 113389648 B CN113389648 B CN 113389648B CN 202110852232 A CN202110852232 A CN 202110852232A CN 113389648 B CN113389648 B CN 113389648B
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0872—Details of the fuel vapour pipes or conduits
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M2025/0845—Electromagnetic valves
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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
- Y02T10/40—Engine management systems
Abstract
The invention discloses a leakage detection device of a high-pressure fuel system, which relates to the technical field of automobile detection and comprises a pressure sensing component, a negative pressure generating component and a valve component, wherein the pressure sensing component is arranged in the fuel system to monitor the pressure of the fuel system in real time; the negative pressure generating assembly is a negative pressure pump which is arranged in the fuel system to generate negative pressure in the fuel system; the valve component is a carbon tank vent pipe electromagnetic valve which is used for being arranged on the carbon tank vent pipe to open or close the carbon tank vent pipe; when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve is closed, the negative pressure pump works and enables the interior of the fuel system to generate negative pressure with preset pressure, and the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to be restored to the atmospheric pressure. The invention can effectively reduce the installation difficulty of the fuel oil detection device and ensure the normal use of the vehicle.
Description
Technical Field
The invention relates to the technical field of automobile detection, in particular to a leakage detection device of a high-pressure fuel system.
Background
In thoughtlessly moving and the increase form motorcycle type, for reducing whole car oil consumption, the engine can not whole journey start usually, for the less problem of desorption volume that leads to the fact from this, high-pressure fuel oil system is adopted to above-mentioned motorcycle type mostly, nevertheless because increased the oil tank isolating valve between oil tank and the carbon tank support in the high-pressure fuel oil system for traditional fuel leakage detection means can't carry out effective detection to high-pressure fuel oil system.
For the above situation, a DMTL (fuel tank leakage diagnosis module) -based leakage detection diagnosis method for a high-pressure fuel system is generally adopted at present to detect the fuel leakage situation of the high-pressure fuel system. DMTL has integrateed the function of control pipeline break-make and to beating the malleation in the pipeline, and is died through leading to the carbon tank atmosphere mouth, opens the oil tank isolating valve, to the inside pressurization test of fuel oil system, combines the pressure sensor test pressure that sets up in oil tank and the desorption pipeline condition of rising, judges whether to have in the fuel oil system and reveals. However, the following problems exist in this detection method: 1. because the integration level of chips and functional modules in DMTL is higher, the filtering efficiency of dust and dust overflowing from a carbon tank is extremely high, the dust filtering efficiency cannot be ensured by all schemes in the industry at present, if the DMTL filtering efficiency is met, the problem of frequent gun jumping for refueling due to overlarge flow resistance can occur, and the normal use of a vehicle is not facilitated; 2. the DMTL has extremely high requirements on arrangement angle and installation position, and because the DMTL has overlarge size, the installation difficulty of the detection device is greatly increased on the premise that the arrangement of the platform is integrally promoted in the industry at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the leakage detection device of the high-pressure fuel system, which can effectively reduce the installation difficulty of the fuel detection device and ensure the normal use of a vehicle.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a pressure sensing assembly for placement in a fuel system for real-time monitoring of pressure of the fuel system;
the negative pressure generating assembly is a negative pressure pump which is arranged in the fuel system to generate negative pressure inside the fuel system;
the valve assembly is a carbon tank vent pipe electromagnetic valve which is used for being arranged on a carbon tank vent pipe to open or close the carbon tank vent pipe;
when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve is closed, the negative pressure pump works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, and the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure.
On the basis of the technical proposal, the utility model has the advantages that,
the pressure sensing assembly comprises a first pressure sensor and a second pressure sensor;
the first pressure sensor is arranged on a pipeline between the oil tank and the carbon tank so as to monitor the pressure in the pipeline between the oil tank isolating valve and the carbon tank in real time;
the second pressure sensor is arranged in the oil tank to monitor the pressure in the oil tank in real time.
On the basis of the technical scheme, the negative pressure pump is arranged on a carbon tank desorption pipeline and an engine intake manifold connecting pipeline, and is close to the carbon tank.
On the basis of the technical scheme, if the engine is in a stop state, the specific process of leakage detection is as follows:
closing an oil tank isolation valve and a carbon tank vent pipe electromagnetic valve, and opening the carbon tank electromagnetic valve;
the negative pressure pump works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump and the carbon tank electromagnetic valve are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time.
On the basis of the technical proposal, the device comprises a shell,
when the obtained time is longer than the first preset time, the fuel system has no leakage condition;
and when the obtained time is not more than the first preset time, the fuel system has a leakage condition.
On the basis of the technical scheme, if the engine is in a starting state, the specific process of leakage detection is as follows:
closing the carbon tank vent pipe electromagnetic valve, and opening the oil tank isolation valve and the carbon tank electromagnetic valve;
the negative pressure pump works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump and the carbon tank electromagnetic valve are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time.
On the basis of the technical proposal, the device comprises a shell,
when the obtained time is longer than the second preset time, the fuel system has no leakage condition;
and when the obtained time is not more than the second preset time, the fuel system has a leakage condition.
On the basis of the technical scheme, the oil tank isolation valve is positioned on a pipeline between the oil tank and the carbon tank and is close to the oil tank so as to isolate the oil tank from the carbon tank.
On the basis of the technical scheme, the method comprises the following steps: the carbon tank electromagnetic valve is located on a carbon tank desorption pipeline and an engine intake manifold connecting pipeline and is close to an engine intake manifold.
On the basis of the technical scheme, the carbon tank vent pipe electromagnetic valve is positioned on one side of the carbon tank communicated with the atmosphere.
Compared with the prior art, the invention has the advantages that: the negative pressure pump used for enabling the inside of the fuel system to generate negative pressure is arranged in the fuel system, the pressure sensing assembly used for monitoring the pressure of the fuel system in real time is arranged in the fuel system, the carbon tank ventilation pipe electromagnetic valve used for controlling the carbon tank ventilation pipe to be opened or closed is arranged on the carbon tank ventilation pipe, when leakage detection is carried out, the carbon tank ventilation pipe electromagnetic valve is closed, the negative pressure pump works and enables the inside of the fuel system to generate negative pressure with preset pressure intensity, the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to recover to atmospheric pressure, judgment of the leakage condition of the fuel system can be carried out based on the obtained time, the whole detection device is simple to install, the installation difficulty of the fuel detection device is effectively reduced, meanwhile, the requirements on the carbon tank and a dust filter when the leakage condition is judged, the problem that the flow resistance of the carbon tank is increased and the filtering efficiency is solved, and normal use of a vehicle is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a leakage detection device of a high-pressure fuel system in an embodiment of the invention.
In the figure: the system comprises a negative pressure pump 1, a carbon tank 2, an oil tank 3, a carbon tank vent pipe electromagnetic valve 4, a first pressure sensor 5, a second pressure sensor 6, an oil tank isolation valve 7, a carbon tank desorption pipeline 8, an engine intake manifold connecting pipeline 9 and a carbon tank electromagnetic valve 9.
Detailed Description
The embodiment of the invention provides a leakage detection device of a high-pressure fuel system, which is characterized in that a negative pressure pump 1 for generating negative pressure inside the fuel system is arranged in the fuel system, a pressure sensing assembly for monitoring the pressure of the fuel system in real time is arranged in the fuel system, a carbon tank vent pipe electromagnetic valve 4 for controlling the opening or closing of the carbon tank vent pipe is arranged on the carbon tank vent pipe, when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve 4 is closed, the negative pressure pump 1 works and enables the inside of the fuel system to generate negative pressure with preset pressure intensity, the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to recover to atmospheric pressure, the judgment of the leakage condition of the fuel system can be carried out based on the obtained time, the whole detection device is simple to install, the installation difficulty of the fuel detection device is effectively reduced, the requirements on a carbon tank 2 and a dust filter when the leakage condition is judged is reduced, the overlarge problem caused by the increase of the filtering efficiency of the carbon tank 2 is reduced, and the normal use of a vehicle is ensured.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
Referring to fig. 1, a leakage detection apparatus for a high-pressure fuel system according to an embodiment of the present invention includes a pressure sensing assembly, a negative pressure generating assembly, and a valve assembly.
The pressure sensing assembly is arranged in a fuel system to monitor the pressure of the fuel system in real time, and the detection principle of the leakage detection device is as follows: and after the interior of the fuel system is pumped to form negative pressure, judging whether the fuel system leaks or not based on the pressure change condition in the fuel system. Therefore, the pressure sensing assembly is used for monitoring the pressure of the fuel system in real time, further obtaining the pressure change condition inside the fuel system and further obtaining the judgment whether the fuel system leaks.
The negative pressure generating assembly is a negative pressure pump 1 which is arranged in the fuel system to enable the interior of the fuel system to generate negative pressure, and air is exhausted from the interior of the fuel system to enable the interior of the fuel system to form negative pressure through the work of the negative pressure pump 1, so that the pressure sensing assembly monitors the pressure of the fuel system in real time to obtain the pressure change condition of the interior of the fuel system, and a judgment result of whether the fuel system leaks is obtained.
The valve assembly is a canister vent line solenoid valve 4 for placement on a canister vent line to open or close the canister vent line. Through the setting of carbon tank ventilation pipe solenoid valve 4 to whether communicate atmosphere to carbon tank 2 controls. When leakage detection is carried out, the carbon tank vent pipe electromagnetic valve 4 is closed, the negative pressure pump 1 works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, and the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure. If the inside of the fuel system leaks, the pressure of the fuel system can be quickly recovered to the atmospheric pressure after the inside of the fuel system is pumped to the negative pressure, and when the inside of the fuel system does not leak, the pressure of the fuel system can be recovered to the atmospheric pressure after the inside of the fuel system is pumped to the negative pressure for a long time, so that the time threshold is obtained through a previous repeated test, the time required for recovering the pressure of the fuel system to the atmospheric pressure is compared with the time threshold, and then whether the leakage condition of the fuel system exists or not is judged.
In the embodiment of the present invention, the pressure sensing assembly includes a first pressure sensor 5 and a second pressure sensor 6; the first pressure sensor 5 is arranged on a pipeline between the oil tank 3 and the carbon tank 2 to monitor the pressure in the pipeline between the oil tank isolation valve 7 and the carbon tank 2 in real time, and in the subsequent detection process, after the interior of the fuel system is pumped into negative pressure, the first pressure sensor 5 monitors the pressure in the pipeline between the oil tank isolation valve 7 and the carbon tank 2 in real time to obtain the time required by the pipeline to be recovered to the atmospheric pressure from the negative pressure; the second pressure sensor 6 is arranged in the oil tank 3 to monitor the pressure in the oil tank 3 in real time, and in the subsequent detection process, after the interior of the fuel system is pumped to negative pressure, the second pressure sensor 6 monitors the pressure in the oil tank 3 in real time to obtain the time required by the oil tank 3 to recover from the negative pressure to the atmospheric pressure.
In the embodiment of the invention, the negative pressure pump 1 is arranged on a connecting pipeline 8 between a carbon tank desorption pipeline and an engine intake manifold, and the negative pressure pump 1 is close to the carbon tank 2. The carbon tank electromagnetic valve 9 is positioned on the carbon tank desorption pipeline and the engine intake manifold connecting pipeline 8 and is close to the engine intake manifold. Specifically, the negative pressure pump 1 and the carbon canister electromagnetic valve 9 are both located on a carbon canister desorption pipeline and an engine intake manifold connecting pipeline 8, the carbon canister electromagnetic valve 9 is located between the engine intake manifold and the negative pressure pump 1, and the negative pressure pump 1 is located between the carbon canister electromagnetic valve 9 and the carbon canister 2. Through carbon canister solenoid valve 9's setting, control the intercommunication between carbon canister 2 and the engine intake manifold, when carbon canister solenoid valve 9 opened, communicate between carbon canister 2 and the engine intake manifold, when carbon canister solenoid valve 9 closed, do not communicate between carbon canister 2 and the engine intake manifold.
In the embodiment of the invention, the oil tank isolation valve 7 is positioned on a pipeline between the oil tank 3 and the carbon tank 2 and is arranged close to the oil tank 3 so as to isolate the oil tank 3 from the carbon tank 2. Specifically, the tank isolation valve 7 is located between the tank 3 and the first pressure sensor 5, and the first pressure sensor 5 is located between the tank isolation valve 7 and the canister 2. Through the setting of oil tank isolating valve 7, the intercommunication between control oil tank 3 and carbon tank 2, when oil tank isolating valve 7 was opened, communicate between oil tank 3 and the carbon tank 2, when oil tank isolating valve 7 was closed, do not communicate between oil tank 3 and the carbon tank 2.
In the embodiment of the invention, the carbon tank vent pipe electromagnetic valve 4 is positioned at one side of the carbon tank 2 communicated with the atmosphere. Through the setting of carbon tank ventilation pipe solenoid valve 4 to whether to communicate atmosphere carbon tank 2 controls.
The leakage detection device provided by the embodiment of the invention can detect whether the fuel system leaks or not when the engine is in a stop state and a start state.
When the engine is in a stop state, the specific process of leakage detection is as follows:
s111: closing the oil tank isolation valve 7 and the carbon tank vent pipe electromagnetic valve 4, and opening the carbon tank electromagnetic valve 9; at this time, the canister 2 is not communicated with the atmosphere, the oil tank 3 is not communicated with the canister 2, and the canister 2 is communicated with an engine intake manifold.
S112: the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed, and specifically 10Mbar negative pressure is generated; because the oil tank isolation valve 7 is in a closed state, when the negative pressure pump 1 works, specifically the carbon tank 2 and the pipeline between the oil tank 3 and the carbon tank 2 form negative pressure.
S113: the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure; because the oil tank isolation valve 7 is in a closed state, negative pressure cannot be formed in the oil tank 3 after the negative pressure pump 1 works, at the moment, the first pressure sensor 5 monitors the pressure change condition of the fuel system, and the time required for the pressure of the fuel system to be recovered to the atmospheric pressure is obtained through the first pressure sensor 5.
S114: and judging to obtain the leakage condition of the fuel system based on the obtained time. When the obtained time is longer than the first preset time, the fuel system has no leakage condition; and when the obtained time is not more than the first preset time, the fuel system has a leakage condition. And carrying out value taking on the first preset time according to the actual working experience.
That is, for the leakage detection device of the embodiment of the present invention, when the leakage detection is performed on the fuel system, if the engine is in a shutdown state, the fuel tank isolation valve 7 and the canister vent pipe electromagnetic valve 4 are closed, and the canister electromagnetic valve 9 is opened; the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed; the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure; and judging to obtain the leakage condition of the fuel system based on the obtained time.
When the engine is in a starting state, the specific process of leakage detection is as follows:
s121: closing the carbon tank vent pipe electromagnetic valve 4, and opening the oil tank isolation valve 7 and the carbon tank electromagnetic valve 9; at this time, the canister 2 is not communicated with the atmosphere, the oil tank 3 is communicated with the canister 2, and the canister 2 is communicated with the engine intake manifold.
S122: the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed; specifically, 10Mbar negative pressure is generated; because the oil tank isolation valve 7 is in an open state, when the negative pressure pump 1 works, the carbon tank 2, the oil tank 3 and the pipeline between the oil tank 3 and the carbon tank 2 form negative pressure.
S123: the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure; because oil tank isolating valve 7 is in the open mode, all can form the negative pressure in oil tank 3 and the carbon tank 2 after negative pressure pump 1 works, and the pressure in oil tank 3 and the carbon tank 2 is the same, so the reading condition that first pressure sensor 5 and second pressure sensor 6 monitoring obtained is the same, and first pressure sensor 5 and second pressure sensor 6 monitor the pressure change condition of fuel system promptly, and the time that the fuel system pressure that obtains resumes to atmospheric pressure is also the same.
S124: and judging to obtain the leakage condition of the fuel system based on the obtained time. When the obtained time is longer than the second preset time, the fuel system has no leakage condition; and when the obtained time is not more than the second preset time, the fuel system has a leakage condition. And carrying out value taking on the second preset time according to the actual working experience.
That is, for the leakage detection device of the embodiment of the present invention, when the leakage detection is performed on the fuel system, if the engine is in the start state, the canister vent pipe electromagnetic valve 4 is closed, and the fuel tank isolation valve 7 and the canister electromagnetic valve 9 are opened; the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed; the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure; and judging to obtain the leakage condition of the fuel system based on the obtained time.
According to the leakage detection device of the high-pressure fuel system, the negative pressure pump 1 used for enabling the interior of the fuel system to generate negative pressure is arranged in the fuel system, the pressure sensing assembly used for monitoring the pressure of the fuel system in real time is arranged in the fuel system, the carbon tank vent pipe electromagnetic valve 4 used for controlling the opening or closing of the carbon tank vent pipe is arranged on the carbon tank vent pipe, when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve 4 is closed, the negative pressure pump 1 works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to recover to atmospheric pressure, the judgment of the leakage condition of the fuel system can be carried out based on the obtained time, the whole detection device is simple to install, the installation difficulty of the fuel detection device is effectively reduced, meanwhile, the requirements on the carbon tank 2 and a dust filter when the leakage condition is judged are reduced, the overlarge problem caused by the fact that the carbon tank 2 increases the filtering efficiency is reduced, and the normal use of a vehicle is guaranteed.
Further, the present invention may also provide an automobile, where an embodiment of the present invention provides an automobile including the above-mentioned leak detection apparatus, and for the leak detection apparatus included in the embodiment of the present invention, the leak detection apparatus specifically includes a pressure sensing assembly, a negative pressure generating assembly, and a valve assembly. The pressure sensing assembly is arranged in the fuel system to monitor the pressure of the fuel system in real time; the negative pressure generating assembly is a negative pressure pump 1 which is arranged in the fuel system to enable the interior of the fuel system to generate negative pressure, and air is extracted from the interior of the fuel system through the work of the negative pressure pump 1 to enable the interior of the fuel system to form negative pressure, so that the pressure sensing assembly monitors the pressure of the fuel system in real time to obtain the pressure change condition of the interior of the fuel system, and a judgment result of whether the fuel system leaks is obtained; the valve component is a carbon tank vent pipe electromagnetic valve 4 which is used for being arranged on the carbon tank vent pipe to open or close the carbon tank vent pipe; when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve 4 is closed, the negative pressure pump 1 works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, and the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure.
In the embodiment of the present invention, the pressure sensing assembly includes a first pressure sensor 5 and a second pressure sensor 6; the first pressure sensor 5 is arranged on a pipeline between the oil tank 3 and the carbon tank 2 so as to monitor the pressure in the pipeline between the oil tank isolation valve 7 and the carbon tank 2 in real time; a second pressure sensor 6 is provided in the fuel tank 3 to monitor the pressure within the fuel tank 3 in real time. The negative pressure pump 1 is arranged on a carbon tank desorption pipeline and an engine intake manifold connecting pipeline 8, and the negative pressure pump 1 is close to the carbon tank 2. The oil tank isolation valve 7 is located on a pipeline between the oil tank 3 and the carbon tank 2, and is close to the oil tank 3 to be arranged so as to isolate the oil tank 3 from the carbon tank 2. The carbon tank electromagnetic valve 9 is positioned on the carbon tank desorption pipeline and the engine intake manifold connecting pipeline 8 and is close to the engine intake manifold. The carbon tank vent pipe electromagnetic valve 4 is positioned at one side of the carbon tank 2 communicated with the atmosphere.
If the inside of the fuel system leaks, the pressure of the fuel system can be quickly recovered to the atmospheric pressure after the inside of the fuel system is pumped to the negative pressure, and when the inside of the fuel system does not leak, the pressure of the fuel system can be recovered to the atmospheric pressure after the inside of the fuel system is pumped to the negative pressure for a long time, so that the time threshold is obtained through a previous repeated test, the time required for recovering the pressure of the fuel system to the atmospheric pressure is compared with the time threshold, and then whether the leakage condition of the fuel system exists or not is judged.
In the embodiment of the present invention, if the engine is in a stopped state, the specific process of performing the leakage detection is as follows:
closing the oil tank isolation valve 7 and the carbon tank vent pipe electromagnetic valve 4, and opening the carbon tank electromagnetic valve 9;
the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time. Specifically, when the obtained time is longer than a first preset time, the fuel system has no leakage condition; and when the obtained time is not more than the first preset time, the fuel system has a leakage condition.
In the embodiment of the present invention, if the engine is in the starting state, the specific process of performing the leakage detection is as follows:
closing the carbon tank vent pipe electromagnetic valve 4, and opening the oil tank isolation valve 7 and the carbon tank electromagnetic valve 9;
the negative pressure pump 1 works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump 1 and the carbon tank electromagnetic valve 9 are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time. Specifically, when the obtained time is longer than a second preset time, the fuel system has no leakage condition; and when the obtained time is not more than the second preset time, the fuel system has a leakage condition.
According to the automobile provided by the embodiment of the invention, the negative pressure pump 1 used for enabling the interior of the fuel system to generate negative pressure is arranged in the fuel system, the pressure sensing assembly used for monitoring the pressure of the fuel system in real time is arranged in the fuel system, the carbon tank vent pipe electromagnetic valve 4 used for controlling the opening or closing of the carbon tank vent pipe is arranged on the carbon tank vent pipe, when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve 4 is closed, the negative pressure pump 1 works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to recover to the atmospheric pressure, the judgment of the leakage condition of the fuel system can be carried out based on the obtained time, the whole detection device is simple to install, the installation difficulty of the fuel detection device is effectively reduced, meanwhile, the requirements on the carbon tank 2 and a dust filter when the leakage condition is judged are reduced, the problem that the flow resistance is too large due to the increase of the filtering efficiency of the carbon tank 2 is solved, and the normal use of the automobile is ensured.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, 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. Also, 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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 (9)
1. A leak detection device for a high pressure fuel system, comprising:
a pressure sensing assembly for placement in a fuel system for real-time monitoring of a pressure of the fuel system;
a negative pressure generating assembly being a negative pressure pump (1) for being arranged in the fuel system for generating a negative pressure inside the fuel system;
a valve assembly, which is a canister vent solenoid valve (4) for being disposed on the canister vent to open or close the canister vent;
when leakage detection is carried out, the carbon tank vent pipe electromagnetic valve (4) is closed, the negative pressure pump (1) works and enables the interior of the fuel system to generate negative pressure with preset pressure intensity, and the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required by the pressure of the fuel system to restore to the atmospheric pressure;
wherein the content of the first and second substances,
the pressure sensing assembly comprises a first pressure sensor (5) and a second pressure sensor (6);
the first pressure sensor (5) is arranged on a pipeline between the oil tank (3) and the carbon tank (2) so as to monitor the pressure in the pipeline between the oil tank isolating valve (7) and the carbon tank (2) in real time;
the second pressure sensor (6) is arranged in the oil tank (3) to monitor the pressure in the oil tank (3) in real time.
2. The leak detection device for a high pressure fuel system as defined in claim 1, wherein: negative pressure pump (1) sets up on carbon tank desorption pipeline and engine air intake manifold connecting line (8), just negative pressure pump (1) is close to carbon tank (2).
3. The leak detection device for a high pressure fuel system according to claim 1, wherein if the engine is in a stopped state, the leak detection is performed by:
closing an oil tank isolation valve (7) and a carbon tank vent pipe electromagnetic valve (4), and opening a carbon tank electromagnetic valve (9);
the negative pressure pump (1) works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump (1) and the carbon tank electromagnetic valve (9) are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time.
4. A leak detection device for a high pressure fuel system according to claim 3, wherein:
when the obtained time is longer than the first preset time, the fuel system has no leakage condition;
and when the obtained time is not more than the first preset time, the fuel system has a leakage condition.
5. The leakage detection device of the high-pressure fuel system as claimed in claim 1, wherein if the engine is in a starting state, the specific process of performing the leakage detection is as follows:
closing the carbon tank vent pipe electromagnetic valve (4), and opening the oil tank isolation valve (7) and the carbon tank electromagnetic valve (9);
the negative pressure pump (1) works, negative pressure with preset pressure intensity is generated in the fuel system, and the negative pressure pump (1) and the carbon tank electromagnetic valve (9) are closed;
the pressure sensing assembly monitors the pressure of the fuel system to obtain the time required for the pressure of the fuel system to recover to the atmospheric pressure;
and judging to obtain the leakage condition of the fuel system based on the obtained time.
6. A leak detection device for a high pressure fuel system according to claim 5, wherein:
when the obtained time is longer than the second preset time, the fuel system has no leakage condition;
and when the obtained time is not more than the second preset time, the fuel system has a leakage condition.
7. A leakage detecting device of a high-pressure fuel system as claimed in claim 3 or 5, wherein: oil tank isolating valve (7) are located the pipeline between oil tank (3) and carbon tank (2), and are close to oil tank (3) and set up in order to be used for keeping apart between oil tank (3) and carbon tank (2).
8. A leakage detecting device of a high-pressure fuel system as claimed in claim 3 or 5, wherein: the carbon tank electromagnetic valve (9) is positioned on a carbon tank desorption pipeline and an engine intake manifold connecting pipeline (8) and is close to the engine intake manifold.
9. A leak detection device for a high pressure fuel system as defined in claim 1, wherein: the carbon tank vent pipe electromagnetic valve (4) is positioned on one side of the carbon tank (2) communicated with the atmosphere.
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| CN113847175A (en) * | 2021-09-16 | 2021-12-28 | 江西昌河汽车有限责任公司 | Pressure adjusting structure and method for high-pressure fuel system |
| CN114112189B (en) * | 2021-11-09 | 2022-09-16 | 奇瑞汽车股份有限公司 | Fault detection method, device, equipment and medium for oil tank pressure sensor |
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| CN115142971B (en) * | 2022-07-26 | 2023-12-29 | 东风小康汽车有限公司重庆分公司 | Fuel control method and system for range-extended automobile |
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