CN211954590U - Oil tank leakage diagnosis module and fuel evaporative emission leakage diagnosis system - Google Patents
Oil tank leakage diagnosis module and fuel evaporative emission leakage diagnosis system Download PDFInfo
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- CN211954590U CN211954590U CN202020481663.0U CN202020481663U CN211954590U CN 211954590 U CN211954590 U CN 211954590U CN 202020481663 U CN202020481663 U CN 202020481663U CN 211954590 U CN211954590 U CN 211954590U
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Abstract
The utility model discloses an oil tank leakage diagnosis module, which comprises an air pump, a proportional solenoid valve, a main cavity and a high-pressure cavity; the bottom of the main cavity is provided with an atmosphere through hole; the air inlet of the air pump is communicated with the atmosphere inlet, and the high-pressure air outlet is communicated with the high-pressure cavity; the high-pressure cavity is provided with a reference hole communicated with the main cavity; the top plate of the main cavity is provided with a main hole communicated with the high-pressure cavity; the top plate of the main cavity is also provided with an air pump opening of an oil tank carbon tank; the valve cover of the proportional solenoid valve is arranged in the main cavity; when the proportional solenoid valve is not powered on, the valve cover of the proportional solenoid valve moves up to the air pump port and the main hole of the upper closed oil tank carbon tank, and meanwhile, the atmosphere through hole is communicated with the atmosphere inlet. The utility model also discloses a fuel evaporation discharges and leaks diagnostic system including this oil tank leakage diagnostic module, its pipeline that need not be at carbon tank to the oil tank sets up the oil tank stop valve, alright with the necessary reference current value of carrying out the oil tank leakage diagnosis in order to obtain, simple structure, it is with low costs.
Description
Technical Field
The utility model relates to the field of automotive technology, in particular to diagnostic module and fuel evaporative emission leak diagnostic system are leaked to oil tank.
Background
Due to high ambient temperature, heat generated by fuel pump power loss in the fuel tank, backflow of unspent compressed gasoline, external heat radiation, ambient pressure drop during driving, etc., HC (hydrocarbon) emissions, which are mainly fuel vapor from the fuel tank, are generated.
In order to identify leaks in the tank and in the tank ventilation device, american vehicles are equipped with a fuel leak Diagnosis Module (DMTL) which has a follow-up function, which identifies leaks greater than 0.5mm in the entire fuel evaporation system and displays them by means of fault indicator lamps. And in the closed oil tank system, the pressure of the oil tank rises and the current rises rapidly when the air pump works. There is a leaking tank system, there is no or little tank pressure rise, and the pump current is slow or does not rise. The air pump pumps air in the oil tank system, so that the pressure of the oil tank rises, and the current of the air pump indirectly reflects the situation of pressure rise in the oil tank, so that the airtightness of the oil tank system is evaluated.
The tank leak Diagnostic Module (DMTL) generates a pressure of 20 to 30mbar (1bar 100kPa) in the tank by means of an electric air pump, and the pump current required to achieve the pressure is measured by the DME as an indirect value of the tank pressure. Before each measurement, a comparison measurement is made by the tank leak Diagnostic Module (DMTL). During the comparative measurement, a gauge pressure corresponding to a reference leakage of 0.5mm is established and maintained for 10-15 s, and the pump current required for this is measured at 20-30 mA. During a subsequent pressure build-up, if a drop in current is detected in comparison with the previously measured pump reference current, this is a signal that a leak is present in the fuel system; if the reference current is exceeded, it indicates that there is no leakage in the system.
The diagnostic process can be divided into three stages, stage 1 for active carbon filter scavenging, stage 2 for reference measurement with respect to a reference hole, and stage 3 for true leak tightness detection. The measurement time is determined by the tank level. The determination of a leakage fault is determined by comparing the difference in tank system pressure at the reference state and the detection state. The DMTL is controlled by an Electronic Control Unit (ECU) to determine which operating state the built-in solenoid valve is in. The existing DMTL adopts a switch electromagnetic valve, whether the switch electromagnetic valve is electrified or not realizes the balance of two positions, and the on-off of air, an oil tank and a carbon tank air path is controlled.
As shown in fig. 1, when the diagnosis is not activated and the fuel tank breathes, the canister control valve is closed, the fuel tank cut-off valve FTIV is opened, the air pump is closed, the on-off solenoid valve is in the open position 1, and the fuel vapor HC in the fuel tank is adsorbed by the canister.
As shown in fig. 2, when the canister is not activated and flushed for diagnostics, the canister control valve is open, the tank stop valve FTIV is closed, the air pump is closed, the DMTL solenoid valve is in open position 1 and air is admitted to the manifold through the canister.
As shown in fig. 3, when diagnosis is activated and the DMTL is in a Reference state (Reference mode), the fuel tank stop valve FTIV needs to be closed, the canister control valve is closed, the air pump operates, the DMTL switching solenoid valve is in the open position 2, the main hole communicating the air pump high-pressure air outlet end and the DMTL main chamber is closed, air at the air pump high-pressure air outlet end forms a loop through the Reference hole and the DMTL main chamber, when the pressure in the DMTL main chamber reaches a balance, the current tends to be stable, the Reference current at the time is measured and recorded, and the current value corresponding to the Reference hole in the current ambient temperature and ambient pressure state can be obtained. The reference hole has a smallest cross-section much smaller than the smallest cross-section of the main hole (less than 1/10), and the reference hole is usually a 0.5mm reference hole with a smallest cross-section of 0.5 mm.
As shown in fig. 4, when diagnosis is activated and the DMTL is in a main detection state (Tank mode), a fault is diagnosed, the carbon Tank control valve is closed, the oil Tank stop valve FTIV is opened, the air pump operates, the switching solenoid valve is in a closed position 1, air at the high-pressure air outlet end of the air pump forms a loop through the main hole and the DMTL main cavity to be led to the carbon Tank and the oil Tank, the air pump pumps air into the carbon Tank and the oil Tank system, and whether the oil Tank system leaks or not is judged according to the current of the air pump.
It can be seen that for evaluating the tightness of the tank system using existing DMTL, it is necessary to provide a tank stop valve FTIV in the canister to tank line.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, need not set up the oil tank stop valve at the pipeline of carbon tank to the oil tank, alright in order to obtain to carry out the oil tank and leak the diagnostic necessary reference current value, carry out the oil tank and leak the diagnosis, it is with low costs.
In order to solve the above technical problem, the utility model provides an oil tank leakage diagnosis module, which comprises an air pump 50, a proportional solenoid valve 60, a main cavity and a high pressure cavity;
the bottom of the main cavity is provided with an atmosphere through hole;
the air pump 50 is communicated with the atmosphere inlet at the air inlet and communicated with the high-pressure cavity at the high-pressure air outlet;
the high-pressure cavity is provided with a reference hole 91 communicated with the main cavity;
the top plate of the main cavity is provided with a main hole 92 communicated with the high-pressure cavity;
1/10 where the smallest cross-section of the reference hole is smaller than the smallest cross-section of the main hole;
the top plate of the main cavity is also provided with an oil tank carbon tank air pump port 41;
the valve cover 61 of the proportional solenoid valve 60 is arranged in the main cavity;
when the current flowing through the exciting coil 604 of the proportional solenoid valve 60 is 0, the valve cover 61 is moved up to the upper position, the tank canister air pump port 41 and the main hole 92 are closed, and the atmospheric air through hole is communicated with the atmospheric air inlet.
Preferably, the armature 602, the tubular iron core 603 and the excitation coil 604 of the proportional solenoid valve 60 are all disposed in the body of the proportional solenoid valve 60;
the body of the proportional solenoid valve 60 is positioned below the bottom plate of the main cavity, a valve core 601 of the proportional solenoid valve penetrates through the atmospheric through hole, and the upper end of the valve core 601 is fixedly connected with a valve cover 61;
the lower end of the valve core 601 is fixedly connected with an armature 602;
the armature 602 is disposed within the tubular core 603;
the excitation coil 604 is wound outside the tubular core 603;
the spiral spring 605 is sleeved outside the valve core 601, the upper end of the spiral spring is connected with the valve cover 61, and the lower end of the spiral spring abuts against the body of the proportional solenoid valve 60.
Preferably, the control circuit of the proportional solenoid valve 60 is capable of controlling the current flowing through the exciting coil 604 to be 0, the first current, and the second current;
when the current flowing through the excitation coil 604 is 0, the valve cover 61 moves upwards to the upper position under the action of the elastic force of the spiral spring 605, the air pump port 41 of the fuel tank carbon tank and the main hole 92 are closed, and meanwhile, an atmospheric through hole is communicated with an atmospheric inlet;
when the current flowing through the excitation coil 604 is the first current, the electromagnetic force generated makes the armature 602 overcome the elastic force of the spiral spring 605 to move the valve cover 61 up to the middle position, so that the air pump port 41 of the tank canister and the main hole 92 are both communicated with the main cavity, and the atmosphere through hole is communicated with the atmosphere inlet;
when the current flowing through the exciting coil 604 is the second current, the electromagnetic force generated causes the armature 602 to overcome the elastic force of the coil spring 605 to move the valve cover 61 up to the lower position, so that the tank canister air pump port 41 and the main hole 92 are both communicated with the main cavity, and the passage from the atmosphere through hole to the atmosphere inlet is blocked.
Preferably, a sealing protrusion structure is added on the upper surface of the valve cover 61 corresponding to the fuel tank canister air pump opening 41 and the main hole 92 respectively, so as to realize the sealing of the fuel tank canister air pump opening 41 and the sealing of the main hole 92.
Preferably, the valve cover 61 is provided with a one-way valve 63 for communicating the air pump port 41 of the fuel tank carbon tank with the main cavity;
when the main chamber pressure is greater than the tank canister side pressure, the check valve 63 opens and the tank canister air pump port 41 communicates through the check valve 63 to the main chamber.
Preferably, the check valve 63 is disposed in the middle of the valve cover 61, or the check valve 63 is disposed at the edge of the valve cover 61.
Preferably, the side wall of the air pump port 41 of the fuel tank carbon tank is provided with a check valve 63, when the air pressure of the main cavity is greater than the air pressure of the fuel tank carbon tank side, the check valve 63 is opened, and the air pump port 41 of the fuel tank carbon tank is communicated to the main cavity through the check valve 63.
Preferably, the one-way valve 63 is an umbrella valve.
Preferably, the atmospheric air inlet is provided with an air filter 3.
Preferably, a heating component is disposed at the air pump 50 for heating the air pumped by the air pump 50.
Preferably, the reference hole has a minimum cross-section of 0.5 mm.
In order to solve the technical problem, the fuel evaporative emission leakage diagnosis system comprising the fuel tank leakage diagnosis module provided by the utility model further comprises a carbon tank 6 and a fuel tank 7;
the carbon tank 6 is respectively communicated with an oil tank 7 and a manifold 8 through pipelines;
a carbon tank control valve 81 is arranged on a pipeline of the manifold 8 communicated with the carbon tank 6;
the oil tank leakage diagnosis module is used for controlling the air pump to operate when the oil tank leakage diagnosis module is activated to enter a reference state, controlling the valve cover 61 of the electromagnetic valve 60 to be positioned at the upper position, communicating the main cavity with the atmosphere through hole, closing the main hole 92 and the air pump opening 41 of the carbon tank of the oil tank by the valve cover 61, blocking the passage of external air from the main cavity to the carbon tank and the oil tank, and forming a loop by high-pressure air output by the high-pressure air outlet end of the air pump through the reference hole 91 and the;
and the oil tank leakage diagnosis module activates the current value of the air pump in the reference state to serve as the reference current value corresponding to the reference hole in the current environment temperature and environment pressure state.
Preferably, when the oil tank leakage diagnosis module enters a main detection state after being activated, the air pump is controlled to operate, the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be located at the lower position, the atmosphere through hole is sealed by the valve cover 61 to block a main cavity from communicating with the atmosphere, the main hole 92 and the air pump opening 41 of the oil tank carbon tank are both opened, the main hole 92 and a passage from the air pump opening 41 of the oil tank carbon tank to the main cavity are both opened, and the air pump pumps air into the carbon tank and the oil tank;
and the oil tank leakage diagnosis module activates the current value of the air pump when entering the main detection state, and is used for comparing the current value with the reference current value to judge whether the oil tank leaks or not.
Preferably, the oil tank leakage diagnosis module, when entering a flushing state after being activated, controls the air pump to stop operating, and energizes the proportional solenoid valve 60 to enable the valve cover 61 to be located at a middle position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the oil tank carbon tank air pump port 41 are both opened to the main cavity, and the oil tank 7 and the carbon tank 6 are communicated with the atmosphere through the main cavity;
when the canister is flushed, canister control valve 81 is opened.
Preferably, the control circuit of the proportional solenoid valve 60 is capable of controlling the current flowing through the exciting coil 604 to be a third current;
when the current flowing through the excitation coil 604 is the third current, the electromagnetic force generated causes the armature 602 to overcome the elastic force of the spiral spring 605 to move the valve cover 61 up to the lower position, so that the air pump port 41 of the tank canister and the main hole 92 are both communicated with the main cavity, and the passage from the atmosphere through hole to the atmosphere inlet is blocked;
the oil tank leakage diagnosis module controls the air pump to stop running when entering a flushing state after being activated, and the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the middle upper position firstly and then at the middle position;
the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the upper middle position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the air pump port 41 of the carbon tank of the oil tank are both opened, the main hole 92 and the passage from the air pump port 41 of the carbon tank of the oil tank to the main cavity are both opened, and the oil tank 7 and the carbon tank 6 are communicated with the atmosphere through the main cavity;
when the valve cover 61 is positioned at the middle upper position, the distance between the valve cover 61 and the main hole 92 and the air pump opening 41 of the tank carbon tank is less than d 1;
when the valve cover 61 is positioned at the middle position, the distance between the valve cover 61 and the main hole 92 and the air pump port 41 of the tank carbon tank is larger than d2, and d1 is smaller than d 2.
Preferably, d1 is 1mm and d2 is 5 mm.
Preferably, when the fuel tank leakage diagnosis module is not activated, the air pump is closed, the proportional solenoid valve 60 is not powered on, the valve cover 61 is located at the upper position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the fuel tank carbon tank air pump opening 41 are both closed by the valve cover 61, the passage from the external air to the carbon tank and the fuel tank through the main cavity is blocked, and fuel vapor in the fuel tank is adsorbed by the carbon tank.
The utility model discloses a diagnostic module is leaked to oil tank (DMTL) adopts the proportional solenoid valve, through the electric current that changes the excitation coil 604 that flows, makes electromagnetic force, spring force, external gross pressure three reach dynamic balance, enables valve gap 61 and is in upper position, meso position and next respectively, controls the break-make of atmosphere and air pump high pressure gas outlet, and oil tank carbon tank gas circuit. The fuel evaporation discharge leakage diagnosis system adopting the fuel tank leakage Diagnosis Module (DMTL) can obtain the necessary reference current value for performing fuel tank leakage diagnosis without blocking a passage between a carbon tank and a fuel tank and arranging a fuel tank stop valve FTIV on a pipeline from the carbon tank to the fuel tank, and has simple structure and low cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a state diagram of a prior art evaporative emission leak diagnostic system diagnosing non-activated, tank breathing;
FIG. 2 is a state diagram of a prior art evaporative emissions leak diagnostic system diagnosing an inactive, carbon canister purge;
FIG. 3 is a state diagram of a prior art evaporative emission leak diagnostic system with diagnostic activation and DMTL in a reference state;
FIG. 4 is a state diagram of a prior art evaporative emission leak diagnostic system with diagnostic activation and DMTL in the master test state;
FIG. 5 is a schematic diagram of an embodiment of the fuel evaporative emissions leak diagnostic system of the present invention;
FIG. 6 is a schematic diagram of an embodiment of a fuel tank leak diagnostic module of the fuel evaporative emissions leak diagnostic system of the present invention activated into a reference state;
FIG. 7 is a schematic diagram of an embodiment of a fuel tank leakage diagnostic module of the fuel evaporative emission leakage diagnostic system according to the present invention entering a main detection state after being activated;
fig. 8 is a schematic diagram of an embodiment of a valve cover of the fuel tank leakage diagnosis module according to the present invention at an upper position;
FIG. 9 is a schematic view of the valve cover of an embodiment of the fuel tank leak diagnostic module of the present invention activated into a reference state;
FIG. 10 is a schematic view of a valve cover of an embodiment of a fuel tank leak diagnostic module according to the present invention in a neutral position purging canister;
fig. 11 is a schematic view of the valve cover of an embodiment of the fuel tank leakage diagnosis module according to the present invention in a lower position entering a main detection state;
fig. 12 is a schematic view of an embodiment of a check valve of the fuel tank leakage diagnosis module according to the present invention, the check valve being disposed at an opening position of a valve cover edge portion;
fig. 13 is a schematic view of a check valve disposed at a valve cover edge portion in a closed state according to an embodiment of the fuel tank leakage diagnosis module of the present invention;
fig. 14 is a schematic view of an embodiment of the fuel tank leakage diagnosis module according to the present invention, in which a check valve is disposed on a sidewall of the fuel tank canister air pump port 41.
Description of the reference numerals
5 a fuel tank leakage diagnosis module; 50 air pump; a 60-ratio electromagnetic valve; a valve cover 61; 63 a one-way valve; 601, a valve core; 602 an armature; 603 a tubular core; 604 field coils; 605 a coil spring; 3, an air filter; 4, a carbon tank; 41 air pump opening of the fuel tank carbon tank; 7 an oil tank; 8 a manifold; 81 carbon canister control valves; 91 reference hole; 92 main hole.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 5, 6 and 7, the fuel evaporative emission leakage diagnosis system comprises a fuel tank leakage Diagnosis Module (DMTL)5, a carbon tank 4 and a fuel tank 7;
the carbon tank 4 is respectively communicated with an oil tank 7 and a manifold 8 through pipelines;
a carbon tank control valve 81 is arranged on a pipeline of the manifold 8 communicated with the carbon tank 4;
the oil tank leakage diagnosis module comprises an air pump 50, a proportional solenoid valve 60, a main cavity and a high-pressure cavity;
the valve cover 61 of the proportional solenoid valve 60 is arranged in the main cavity;
the high-pressure air outlet end of the air pump 50 is communicated with the high-pressure cavity;
the high-pressure cavity is communicated with the main cavity through a reference hole 91 and a main hole 92;
1/10 where the smallest cross-section of the reference hole is smaller than the smallest cross-section of the main hole;
the main cavity is communicated to the carbon tank 4 through an air pump port 41 of the carbon tank of the oil tank;
the main cavity is provided with an atmosphere through hole communicated with the atmosphere;
the valve cover 61 of the proportional solenoid valve 60 can be positioned at the upper position;
when the oil tank leakage diagnosis module is activated to enter a reference state, as shown in fig. 6, the air pump is controlled to operate, the valve cover 61 of the proportional solenoid valve 60 is controlled to be positioned at an upper position, the main cavity is communicated with the atmosphere through an atmosphere through hole, the main hole 92 and the air pump opening 41 of the carbon tank of the oil tank are both closed by the valve cover 61, the passage of external air to the carbon tank and the oil tank through the main cavity is blocked, and high-pressure air output by the high-pressure air outlet end of the air pump forms a loop through the reference hole 91 and the main;
and the oil tank leakage diagnosis module activates the current value of the air pump in the reference state to serve as the reference current value corresponding to the reference hole in the current environment temperature and environment pressure state.
Preferably, when the oil tank leakage diagnosis module is activated to enter the reference state, the current value of the air pump after the pressure in the main cavity reaches the balance is used as the reference current value corresponding to the reference hole in the current ambient temperature and ambient pressure state.
The method for diagnosing the fuel evaporative emission leakage diagnosis system comprises the following steps of:
enabling the fuel tank leakage diagnosis module to be activated to enter a reference state;
and secondly, taking the current value of the air pump as the reference current value corresponding to the reference hole in the current ambient temperature and ambient pressure states.
According to the fuel evaporative emission leakage diagnosis system and the fuel evaporative emission leakage diagnosis method, a reference current value necessary for performing fuel tank leakage diagnosis can be obtained without blocking a passage between the carbon tank and the fuel tank and without arranging the fuel tank stop valve FTIV on a pipeline from the carbon tank to the fuel tank, and the fuel evaporative emission leakage diagnosis system and the fuel evaporative emission leakage diagnosis method are simple in structure and low in cost.
Example two
According to the fuel evaporative emission leakage diagnosis system of the first embodiment, the valve cover 61 of the proportional solenoid valve 60 can be located at the lower position;
when the oil tank leakage diagnosis module enters a main detection state after being activated, as shown in fig. 7, the air pump is controlled to operate, the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the lower position, the atmosphere through hole is closed by the valve cover 61 to block a main cavity from communicating with the atmosphere, the main hole 92 and the air pump opening 41 of the oil tank carbon tank are both opened, and the air pump pumps air into the carbon tank and the oil tank;
and the oil tank leakage diagnosis module activates the current value of the air pump when entering the main detection state, and is used for comparing the current value with the reference current value to judge whether the oil tank leaks or not.
The method for diagnosing the fuel evaporative emission leakage diagnosis system comprises the following steps of:
enabling the oil tank leakage diagnosis module to enter a main detection state after being activated;
and comparing the current value of the air pump when the oil tank leakage diagnosis module is activated to enter a main detection state with the reference current value, and judging whether the oil tank leaks or not.
EXAMPLE III
Based on the fuel evaporative emission leakage diagnosis system of the second embodiment, the valve cover 61 of the proportional solenoid valve 60 can be located at the middle position;
the oil tank leakage diagnosis module controls the air pump to stop running when the oil tank leakage diagnosis module enters a flushing state after being activated, the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the middle position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the air pump opening 41 of the carbon tank of the oil tank are both opened, the main hole 92 and the passage from the air pump opening 41 of the carbon tank of the oil tank to the main cavity are both opened, and the oil tank 7 and the carbon tank 4 are communicated with the atmosphere through the main cavity;
when the canister is flushed, canister control valve 81 is opened.
The diagnosis method of the fuel evaporative emission leakage diagnosis system comprises the following steps:
opening canister control valve 81;
and enabling the oil tank leakage diagnosis module to enter a flushing state after being activated.
In the fuel evaporative emission leakage diagnostic system of the third embodiment, the valve cover 61 of the proportional solenoid valve 60 can be located at three positions, namely an upper position, a middle position and a lower position.
Example four
Based on the fuel evaporative emission leakage diagnosis system of the third embodiment, the valve cover 61 of the proportional solenoid valve 60 can be positioned at the middle upper position;
the oil tank leakage diagnosis module controls the air pump to stop running when entering a flushing state after being activated, and the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the middle upper position firstly and then at the middle position;
the proportional solenoid valve 60 is electrified to enable the valve cover 61 to be positioned at the upper middle position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the air pump port 41 of the carbon tank of the oil tank are both opened, the main hole 92 and the passage from the air pump port 41 of the carbon tank of the oil tank to the main cavity are both opened, and the oil tank 7 and the carbon tank 4 are communicated with the atmosphere through the main cavity;
when the valve cover 61 is positioned at the middle upper position, the distance between the valve cover 61 and the main hole 92 and the air pump opening 41 of the tank carbon tank is less than d 1;
when the valve cover 61 is positioned at the middle position, the distance between the valve cover 61 and the main hole 92 and the air pump port 41 of the tank carbon tank is larger than d2, and d1 is smaller than d 2.
Preferably, d1 is 1mm and d2 is 5 mm.
The diagnosis method of the fuel evaporative emission leakage diagnosis system comprises the following steps:
opening canister control valve 81;
and enabling the oil tank leakage diagnosis module to enter a flushing state after being activated.
In the fuel evaporative emission leakage diagnosis system of the fourth embodiment, the valve cover 61 of the proportional solenoid valve 60 can be located at four positions, namely the upper position, the middle position and the lower position, so that the fuel tank can be refueled to perform stepped pressure relief, the pressure relief is performed through a small opening, the refueled limit control valve FLVV is prevented from being closed, then the pressure relief is performed in a large area, and the positive pressure of the fuel tank is actively opened to flush the carbon tank.
EXAMPLE five
Based on the fuel evaporative emission leakage diagnosis system of the first to fourth embodiments, when the fuel tank leakage diagnosis module is not activated, the air pump is closed, the proportional solenoid valve 60 is not electrified, the valve cover 61 is located at the upper position, the main cavity is communicated with the atmosphere through hole, the main hole 92 and the fuel tank carbon tank air pump opening 41 are both closed by the valve cover 61, the passage from the external air to the carbon tank and the fuel tank through the main cavity is blocked, and fuel tank fuel vapor is adsorbed by the carbon tank.
Preferably, the valve cover 61 is provided with a one-way valve 63 for communicating the air pump port 41 of the fuel tank carbon tank with the main cavity, when the air pressure of the main cavity is greater than the air pressure at the side of the fuel tank carbon tank, the one-way valve 63 is opened, and the air pump port 41 of the fuel tank carbon tank is communicated with the main cavity through the one-way valve 63; if the tank pressure is below atmospheric pressure, the one-way valve 63 on the valve cover 61 is opened and outside air enters the canister and tank through the main chamber.
EXAMPLE six
As shown in fig. 8, 9, 10, and 11, the tank leakage Diagnosis Module (DMTL)5 includes an air pump 50, a proportional solenoid valve 60, a main chamber, and a high pressure chamber;
the bottom of the main cavity is provided with an atmosphere through hole;
the air pump 50 is communicated with the atmosphere inlet at the air inlet and communicated with the high-pressure cavity at the high-pressure air outlet;
the high-pressure cavity is provided with a reference hole 91 communicated with the main cavity;
the top plate of the main cavity is provided with a main hole 92 communicated with the high-pressure cavity;
1/10 where the smallest cross-section of the reference hole is smaller than the smallest cross-section of the main hole;
the top plate of the main cavity is also provided with an oil tank carbon tank air pump port 41;
the valve cover 61 of the proportional solenoid valve 60 is arranged in the main cavity;
when the current flowing through the exciting coil 604 of the proportional solenoid valve 60 is 0, the valve cover 61 is moved up to the upper position, the tank canister air pump port 41 and the main hole 92 are closed, and the atmospheric air through hole is communicated with the atmospheric air inlet.
Preferably, the armature 602, the tubular iron core 603 and the excitation coil 604 of the proportional solenoid valve 60 are all disposed in the body of the proportional solenoid valve 60;
the body of the proportional solenoid valve 60 is positioned below the bottom plate of the main cavity, a valve core 601 of the proportional solenoid valve penetrates through the atmospheric through hole, and the upper end of the valve core 601 is fixedly connected with a valve cover 61;
the lower end of the valve core 601 is fixedly connected with an armature 602;
the armature 602 is disposed within the tubular core 603;
the excitation coil 604 is wound outside the tubular core 603;
the spiral spring 605 is sleeved outside the valve core 601, the upper end of the spiral spring is connected with the valve cover 61, and the lower end of the spiral spring abuts against the body of the proportional solenoid valve 60.
The control circuit of the proportional solenoid valve 60 can control the current flowing through the exciting coil 604 to be 0, the first current and the second current;
when the current flowing through the excitation coil 604 is 0, the valve cover 61 moves upwards to the upper position under the action of the elastic force of the spiral spring 605, the air pump port 41 of the fuel tank carbon tank and the main hole 92 are closed, and meanwhile, an atmospheric through hole is communicated with an atmospheric inlet;
when the current flowing through the excitation coil 604 is the first current, the electromagnetic force generated makes the armature 602 overcome the elastic force of the spiral spring 605 to move the valve cover 61 up to the middle position, so that the air pump port 41 of the tank canister and the main hole 92 are both communicated with the main cavity, and the atmosphere through hole is communicated with the atmosphere inlet;
when the current flowing through the exciting coil 604 is the second current, the electromagnetic force generated causes the armature 602 to overcome the elastic force of the coil spring 605 to move the valve cover 61 up to the lower position, so that the tank canister air pump port 41 and the main hole 92 are both communicated with the main cavity, and the passage from the atmosphere through hole to the atmosphere inlet is blocked.
In the fuel tank leakage Diagnosis Module (DMTL)5 according to the sixth embodiment, a proportional solenoid valve is used, and the electromagnetic force, the spring force, and the external gas pressure are dynamically balanced by changing the current flowing through the excitation coil 604, so that the valve cover 61 is respectively located at the upper position, the middle position, and the lower position, and the opening and closing of the atmosphere, the high-pressure air outlet of the air pump, and the gas path of the fuel tank carbon canister are controlled. The fuel evaporation discharge leakage diagnosis system adopting the fuel tank leakage Diagnosis Module (DMTL) can obtain the necessary reference current value for performing fuel tank leakage diagnosis without blocking a passage between a carbon tank and a fuel tank and arranging a fuel tank stop valve FTIV on a pipeline from the carbon tank to the fuel tank, and has simple structure and low cost.
EXAMPLE seven
Based on the fuel tank leakage Diagnosis Module (DMTL)5 of the sixth embodiment, a sealing protrusion structure is added on the upper surface of the valve cover 61 corresponding to the fuel tank canister air pump opening 41 and the main hole 92 respectively, so as to seal the fuel tank canister air pump opening 41 and the main hole 92.
Preferably, as shown in fig. 12 and 13, the valve cover 61 is provided with a check valve 63 for communicating the tank canister air pump port 41 with the main chamber;
when the main chamber pressure is greater than the tank canister side pressure, as shown in fig. 12, the check valve 63 opens and the tank canister air pump port 41 communicates through the check valve 63 to the main chamber.
Preferably, the check valve 63 is disposed in the middle of the valve cover 61, or the check valve 63 is disposed at the edge of the valve cover 61.
Preferably, as shown in fig. 14, a check valve 63 is disposed on a side wall of the tank canister air pump port 41, and when the air pressure of the main chamber is greater than the air pressure of the tank canister side, the check valve 63 is opened, and the tank canister air pump port 41 is communicated to the main chamber through the check valve 63.
Preferably, the one-way valve 63 is an umbrella valve. Through the check valve 63 that sets up on valve gap 61 or the oil tank carbon tank air pump mouth 41, can realize when the oil tank negative pressure through check valve 63 pressure compensation.
Preferably, the atmospheric air inlet is provided with an air filter 3.
Preferably, a heating component is disposed at the air pump 50 for heating the air pumped by the air pump 50.
Preferably, the reference hole 91 has a minimum cross-section of 0.5 mm.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. The oil tank leakage diagnosis module is characterized by comprising an air pump (50), a proportional solenoid valve (60), a main cavity and a high-pressure cavity;
the bottom of the main cavity is provided with an atmosphere through hole;
the air pump (50) is communicated with the atmosphere inlet at the air inlet and communicated with the high-pressure cavity at the high-pressure air outlet;
the high-pressure cavity is provided with a reference hole (91) communicated with the main cavity;
the top plate of the main cavity is provided with a main hole (92) communicated with the high-pressure cavity;
1/10 where the smallest cross-section of the reference hole is smaller than the smallest cross-section of the main hole;
the top plate of the main cavity is also provided with an air pump opening (41) of an oil tank carbon tank;
the valve cover (61) of the proportional solenoid valve (60) is arranged in the main cavity;
when the current flowing through the excitation coil (604) of the proportional solenoid valve (60) is 0, the valve cover (61) moves upwards to the upper position, the air pump port (41) of the oil tank carbon tank and the main hole (92) are closed, and meanwhile, the atmosphere through hole is communicated with the atmosphere inlet.
2. The fuel tank leakage diagnostic module of claim 1,
the armature (602), the tubular iron core (603) and the excitation coil (604) of the proportional solenoid valve (60) are all arranged in the body of the proportional solenoid valve (60);
the body of the proportional solenoid valve (60) is positioned below the bottom plate of the main cavity, a valve core (601) of the proportional solenoid valve penetrates through the atmospheric through hole, and the upper end of the valve core (601) is fixedly connected with a valve cover (61);
the lower end of the valve core (601) is fixedly connected with an armature (602);
the armature (602) is arranged in the tubular iron core (603);
the excitation coil (604) is wound outside the tubular iron core (603);
the spiral spring (605) is sleeved outside the valve core (601), the upper end of the spiral spring is connected with the valve cover (61), and the lower end of the spiral spring abuts against the body of the proportional solenoid valve (60).
3. The fuel tank leakage diagnostic module of claim 2,
the control circuit of the proportional solenoid valve (60) can control the current flowing through the exciting coil (604) to be 0, a first current and a second current;
when the current flowing through the excitation coil (604) is 0, the valve cover (61) moves upwards to the upper position under the action of the elastic force of the spiral spring (605), the air pump port (41) of the carbon tank of the oil tank and the main hole (92) are closed, and meanwhile, an atmosphere through hole is communicated with an atmosphere inlet;
when the current flowing through the excitation coil (604) is a first current, the generated electromagnetic force enables the armature (602) to overcome the elastic force of the spiral spring (605) to enable the valve cover (61) to move upwards to the middle position, so that the air pump opening (41) of the carbon tank of the oil tank and the main hole (92) are communicated with the main cavity, and meanwhile, the atmosphere through hole is communicated with the atmosphere inlet;
when the current flowing through the excitation coil (604) is the second current, the generated electromagnetic force enables the armature (602) to overcome the elastic force of the spiral spring (605) to enable the valve cover (61) to move upwards to the lower position, so that the air pump opening (41) of the fuel tank carbon tank and the main hole (92) are communicated with the main cavity, and meanwhile, the passage from the atmosphere through hole to the atmosphere inlet is blocked.
4. The fuel tank leakage diagnostic module of claim 1,
the upper surface of the valve cover (61) is respectively provided with a sealing bulge structure corresponding to the air pump opening (41) of the fuel tank carbon tank and the main hole (92) for realizing the sealing of the air pump opening (41) of the fuel tank carbon tank and the sealing of the main hole (92).
5. The fuel tank leakage diagnostic module of claim 1,
the valve cover (61) is provided with a one-way valve (63) which is communicated with the air pump opening (41) of the fuel tank carbon tank and the main cavity;
when the air pressure of the main cavity is larger than the air pressure on the side of the fuel tank carbon tank, the one-way valve (63) is opened, and the air pump port (41) of the fuel tank carbon tank is communicated with the main cavity through the one-way valve (63).
6. The fuel tank leakage diagnostic module according to claim 5,
the check valve (63) is arranged in the middle of the valve cover (61), or the check valve (63) is arranged on the edge of the valve cover (61).
7. The fuel tank leakage diagnostic module according to claim 5,
the lateral wall of the air pump opening (41) of the oil tank carbon tank is provided with a check valve (63), when the air pressure of the main cavity is larger than the air pressure on the side of the oil tank carbon tank, the check valve (63) is opened, and the air pump opening (41) of the oil tank carbon tank is communicated to the main cavity through the check valve (63).
8. The tank leak diagnostic module according to claim 5, 6 or 7,
the one-way valve (63) is an umbrella valve.
9. The fuel tank leakage diagnostic module of claim 1,
the atmosphere inlet is provided with an air filter (3).
10. The fuel tank leakage diagnostic module of claim 1,
and a heating component is arranged at the air pump (50) and used for heating the air pumped by the air pump (50).
11. The fuel tank leakage diagnostic module of claim 1,
the reference hole has a minimum cross-section of 0.5 mm.
12. A fuel evaporative emission leak diagnostic system comprising the fuel tank leak diagnostic module of any one of claims 3 to 7, characterized by further comprising a canister (6), a fuel tank (7);
the carbon tank (6) is respectively communicated with the oil tank (7) and the manifold (8) through pipelines;
a carbon tank control valve (81) is arranged on a pipeline of the manifold (8) communicated with the carbon tank (6);
the oil tank leakage diagnosis module is used for controlling the air pump to operate when the oil tank leakage diagnosis module is activated to enter a reference state, controlling the valve cover (61) of the proportional solenoid valve (60) to be positioned at an upper position, communicating the main cavity with the atmosphere through hole, sealing the main hole (92) and the air pump opening (41) of the carbon tank of the oil tank by the valve cover (61), blocking a passage from external air to the carbon tank and the oil tank through the main cavity, and forming a loop by high-pressure air output by the high-pressure air outlet end of the air pump through the reference hole (91) and the main;
and the oil tank leakage diagnosis module activates the current value of the air pump in the reference state to serve as the reference current value corresponding to the reference hole in the current environment temperature and environment pressure state.
13. The fuel evaporative emissions leak diagnostic system as set forth in claim 12,
the oil tank leakage diagnosis module controls the air pump to operate when entering a main detection state after being activated, the proportional solenoid valve (60) is electrified to enable the valve cover (61) to be located at the lower position, the atmosphere through hole is sealed by the valve cover (61) to block a main cavity from communicating with the atmosphere, the main hole (92) and an air pump opening (41) of the oil tank carbon tank are both opened, the main hole (92) and a passage from the air pump opening (41) of the oil tank carbon tank to the main cavity are both opened, and the air pump pumps air into the carbon tank and the oil tank;
and the oil tank leakage diagnosis module activates the current value of the air pump when entering the main detection state, and is used for comparing the current value with the reference current value to judge whether the oil tank leaks or not.
14. The fuel evaporative emissions leak diagnostic system as set forth in claim 12,
the oil tank leakage diagnosis module controls the air pump to stop running when the oil tank leakage diagnosis module enters a flushing state after being activated, the proportional solenoid valve (60) is electrified to enable the valve cover (61) to be located at a middle position, the main cavity is communicated with the atmosphere through hole, the main hole (92) and the air pump opening (41) of the carbon tank of the oil tank are both opened, the main hole (92) and the passage from the air pump opening (41) of the carbon tank of the oil tank to the main cavity are both opened, and the oil tank (7) and the carbon tank (6) are communicated with the atmosphere through the main cavity;
when the canister is flushed, a canister control valve (81) is opened.
15. The fuel evaporative emissions leak diagnostic system as set forth in claim 12,
the control circuit of the proportional solenoid valve (60) can control the current flowing through the exciting coil (604) to be a third current;
when the current flowing through the excitation coil (604) is a third current, the generated electromagnetic force enables the armature (602) to overcome the elastic force of the spiral spring (605) to enable the valve cover (61) to move upwards to the lower position, so that the air pump opening (41) of the fuel tank carbon tank and the main hole (92) are communicated with the main cavity, and meanwhile, the passage from the atmosphere through hole to the atmosphere inlet is blocked;
the oil tank leakage diagnosis module controls the air pump to stop running when entering a flushing state after being activated, and the proportional solenoid valve (60) is electrified to enable the valve cover (61) to be located at the middle upper position firstly and then at the middle position;
the proportional solenoid valve (60) is electrified to enable the valve cover (61) to be positioned at the middle upper position, the main cavity is communicated with the atmosphere through an atmosphere through hole, the main hole (92) and the air pump opening (41) of the carbon tank of the oil tank are both opened, the passages from the main hole (92) and the air pump opening (41) of the carbon tank of the oil tank to the main cavity are both opened, and the oil tank (7) and the carbon tank (6) are communicated with the atmosphere through the main cavity;
when the valve cover (61) is positioned at the middle upper position, the distance between the valve cover (61) and the main hole (92) and the air pump opening (41) of the fuel tank carbon tank is less than d 1;
when the valve cover (61) is located at the middle position, the distance between the valve cover (61) and the main hole (92) and the air pump opening (41) of the fuel tank carbon tank is larger than d2, and d1 is smaller than d 2.
16. The fuel evaporative emissions leak diagnostic system as set forth in claim 15,
d1 is 1mm and d2 is 5 mm.
17. The fuel evaporative emissions leak diagnostic system as set forth in claim 12,
the oil tank leakage diagnosis module is characterized in that when the oil tank leakage diagnosis module is not activated, the air pump is closed, the proportional solenoid valve (60) is not electrified, the valve cover (61) is located at the upper position, the main cavity is communicated with the atmosphere through hole, the main hole (92) and an air pump opening (41) of the carbon tank of the oil tank are both sealed by the valve cover (61), the passage from the external air to the carbon tank and the oil tank through the main cavity is blocked, and fuel steam of the oil tank is adsorbed by the carbon tank.
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| CN202020481663.0U CN211954590U (en) | 2020-04-06 | 2020-04-06 | Oil tank leakage diagnosis module and fuel evaporative emission leakage diagnosis system |
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| CN202020481663.0U CN211954590U (en) | 2020-04-06 | 2020-04-06 | Oil tank leakage diagnosis module and fuel evaporative emission leakage diagnosis system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417765A (en) * | 2021-06-22 | 2021-09-21 | 浙江吉利控股集团有限公司 | Positive pressure detection device and method and vehicle comprising positive pressure detection device |
| CN114623023A (en) * | 2022-03-16 | 2022-06-14 | 亚普汽车部件股份有限公司 | Steam management system of vehicle |
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2020
- 2020-04-06 CN CN202020481663.0U patent/CN211954590U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417765A (en) * | 2021-06-22 | 2021-09-21 | 浙江吉利控股集团有限公司 | Positive pressure detection device and method and vehicle comprising positive pressure detection device |
| CN114623023A (en) * | 2022-03-16 | 2022-06-14 | 亚普汽车部件股份有限公司 | Steam management system of vehicle |
| CN114623023B (en) * | 2022-03-16 | 2023-11-03 | 亚普汽车部件股份有限公司 | Steam management system of vehicle |
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