WO2016207964A1 - 蒸発燃料処理装置の診断装置 - Google Patents
蒸発燃料処理装置の診断装置 Download PDFInfo
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- WO2016207964A1 WO2016207964A1 PCT/JP2015/067948 JP2015067948W WO2016207964A1 WO 2016207964 A1 WO2016207964 A1 WO 2016207964A1 JP 2015067948 W JP2015067948 W JP 2015067948W WO 2016207964 A1 WO2016207964 A1 WO 2016207964A1
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- WIPO (PCT)
- Prior art keywords
- fuel
- leak diagnosis
- pressure
- fuel tank
- canister
- Prior art date
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- 239000000446 fuel Substances 0.000 title claims abstract description 96
- 238000012545 processing Methods 0.000 title claims abstract description 24
- 239000002828 fuel tank Substances 0.000 claims abstract description 67
- 238000003745 diagnosis Methods 0.000 claims abstract description 61
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 2
- 238000010926 purge Methods 0.000 abstract description 45
- 230000000903 blocking effect Effects 0.000 abstract description 20
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M25/0809—Judging failure of purge control system
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
- F02D41/0035—Controlling the purging of the canister as a function of the engine operating conditions to achieve a special effect, e.g. to warm up the catalyst
- F02D41/0037—Controlling the purging of the canister as a function of the engine operating conditions to achieve a special effect, e.g. to warm up the catalyst for diagnosing the engine
-
- 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
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- 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
- F02M25/089—Layout of the fuel vapour installation
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
-
- 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
Definitions
- the present invention relates to an evaporative fuel processing apparatus that processes evaporative fuel generated in a fuel tank during refueling using a canister, and more particularly to a diagnostic apparatus for diagnosing the presence or absence of the leak.
- Patent Document 1 discloses an evaporative fuel processing apparatus that is provided with a blocking valve in a passage between a fuel tank and a canister so that evaporative fuel is adsorbed from the fuel tank to the canister basically only at the time of refueling.
- the fuel tank is kept in a sealed state by the blocking valve when the vehicle is stopped other than at the time of refueling, and the system prevents the evaporative fuel from flowing out to the outside more reliably.
- the evaporative fuel processing apparatus of patent document 1 is equipped with the diagnostic apparatus which diagnoses the presence or absence of the leak of each part.
- the diagnostic device of Patent Document 1 includes a negative pressure pump connected to the drain port side of the canister, and at an appropriate time during vehicle stop, the system including the fuel tank and the canister is depressurized by the negative pressure pump. The presence or absence of leakage is determined based on the pressure change in the system at that time.
- Patent Document 2 proposes that a leak diagnosis is performed without using a pump by utilizing a pressure change in a tank due to a difference between a fuel temperature after the engine is stopped and an outside air temperature.
- the fuel tank in a sealed fuel tank used in an evaporative fuel processing apparatus equipped with a sealing valve, the fuel tank generally has a thick and strong structure, so that it is difficult to obtain fluctuations in fuel temperature due to the outside temperature.
- a diagnostic apparatus for a fuel vapor processing apparatus comprises: In an evaporative fuel processing apparatus that adsorbs evaporative fuel generated in a fuel tank at the time of refueling with a canister and introduces it into an intake system of the internal combustion engine for processing during operation of the internal combustion engine.
- a pump for pressurizing or depressurizing the system including the fuel tank and the canister; At least one pressure sensor for detecting pressure in the system; A fuel temperature sensor for detecting the temperature of the fuel in the fuel tank; With In response to the leak diagnosis request, based on the temperature difference between the fuel temperature at the start of operation and the fuel temperature after the operation, the first leak diagnosis using the positive pressure or the negative pressure existing in the fuel tank, and the forced by the pump The second leak diagnosis using a normal pressurization or decompression.
- the fuel tank is considered to be positive or negative pressure, so leak diagnosis without operating the pump I do. For example, the presence or absence of a leak is detected by monitoring the pressure change in the system while the system is sealed.
- the pump is operated and the system is set to positive or negative pressure, and then leak diagnosis is performed. For example, the presence or absence of a leak is detected by sealing the system in a state of positive pressure or negative pressure and monitoring the subsequent pressure change in the system.
- the leak diagnosis is performed without depending on the pump, so that the operation frequency of the pump is reduced and the energy consumption can be suppressed.
- FIG. 1 is a structural explanatory view showing an embodiment of an evaporated fuel processing apparatus according to the present invention.
- a vehicle (not shown) is equipped with an internal combustion engine 1 and is provided with a sealed fuel tank 2, and a canister 3 is used to process evaporated fuel generated in the fuel tank 2 during refueling.
- An evaporative fuel processing device is provided.
- the fuel tank 2 includes a fuel supply pipe portion 5 in which a filler cap 4 is detachably attached to a fuel supply port 5a at the tip, and a fuel pump unit 7 that supplies fuel to the fuel injection device 6 of the internal combustion engine 1. Is contained in the fuel tank 2.
- the fuel filler port 5a is covered with a fuel lid 8 that is electrically locked in order to limit the opening of the filler cap 4 when the pressure in the fuel tank 2 is high.
- the fuel lid 8 is unlocked in a state where the pressure in the fuel tank 2 is lowered based on a signal from a lid open switch 9 provided in a driver's seat or the like. Instead of locking the fuel lid 8, the filler cap 4 itself may be locked.
- the canister 3 has a U-turn channel formed by a synthetic resin case, and is filled with an adsorbent made of activated carbon or the like. At one end in the flow direction of the flow path having a U-turn shape, a charge port 13 serving as an inflow portion for evaporated fuel and a purge port 14 serving as an outflow portion for purge gas containing a fuel component are provided. A drain port 15 for taking in outside air at the time of purging is provided at the other end portion.
- the charge port 13 is connected to the upper space of the fuel tank 2 through the evaporated fuel passage 16.
- the tip of the fuel vapor passage 16 on the fuel tank 2 side is connected to the fuel tank via an FLV valve 20 that prevents liquid fuel from overflowing into the fuel vapor passage 16 when the fuel level is high. It communicates with the upper space of 2.
- a blocking valve 21 for opening and closing the evaporated fuel passage 16 is provided in the middle of the evaporated fuel passage 16. This blocking valve 21 is used for shutting off the canister 3 and the fuel tank 2 and sealing the fuel tank 2 except when refueling, as a general rule, and is a normally closed electromagnetic that closes when no power is supplied. It consists of a valve.
- the purge port 14 is connected to the intake system of the internal combustion engine 1, for example, the downstream side of the throttle valve 18 of the intake passage 17 via a purge passage 19.
- the purge passage 19 is provided with a first purge control valve 23 for opening and closing the purge passage 19 in order to control the introduction of purge gas into the internal combustion engine 1.
- the first purge control valve 23 is closed in order to prohibit the introduction of the purge gas under certain conditions such as when the engine is not warmed up or when the fuel is cut.
- the first purge control valve 23 is also composed of a normally closed solenoid valve.
- the drain port 15 is connected to a drain passage 25 whose tip is open to the atmosphere via a filter 24, and a drain cut valve 26 for opening and closing the drain passage 25 is provided in the drain passage 25.
- the drain cut valve 26 is a normally open solenoid valve that is opened when the power is not supplied.
- the drain cut valve 26 closes the system at the time of leak diagnosis, and can be closed when, for example, the breakthrough of the canister 3 is detected by some means. Is open.
- the drain passage 25 is provided with a pressurizing pump 27 that feeds air toward the canister 3 in parallel with the drain cut valve 26.
- the pressurization pump 27 is used for system leak diagnosis, and the pressurization pump 27 and the drain cut valve 26 are integrally configured as a leak diagnosis module 28.
- a tank opening passage 31 that communicates both is provided.
- a second purge control valve 32 for opening and closing the tank opening passage 31 is provided in the middle of the tank opening passage 31.
- the second purge control valve 32 is a normally closed solenoid valve that is closed when not energized.
- the second purge control valve 32 has a passage area smaller than the passage area of the blocking valve 21. Specifically, the diameter of the port opened and closed by the plunger is smaller in the second purge control valve 32 than in the blocking valve 21.
- the blocking valve 21 has a sufficiently large passage area so as not to impair smooth lubrication.
- the blocking valve 21, the first purge control valve 23, the second purge control valve 32, the drain cut valve 26, and the pressurizing pump 27 are various controls (for example, fuel injection amount control, injection timing control) of the internal combustion engine 1. , Ignition timing control, throttle valve 18 opening control, etc.) are appropriately controlled to reduce the pressure in the tank before opening the filler cap 4 during refueling, adsorption processing during refueling, during engine operation Purge processing, leakage diagnosis of each part of the system, and the like are executed.
- a tank pressure sensor 36 is attached to the fuel tank 2, and an evaporation line pressure (hereinafter abbreviated as “evaporation line pressure”) sensor in the vicinity of the purge port 14 of the canister 3. 37 is attached.
- the former tank pressure sensor 36 detects the pressure in the region on the fuel tank 2 side in the system (specifically, the pressure in the upper space of the fuel tank 2) defined by the blocking valve 21 and the second purge control valve 32.
- the latter evaporation line pressure sensor 37 detects the pressure in the region including the canister 3 in the system surrounded by the blocking valve 21, the second purge control valve 32, the drain cut valve 26 and the first purge control valve 23.
- the fuel tank 2 is provided with a fuel temperature sensor 39 for detecting the temperature of the internal fuel, and an outside air temperature sensor 40 for detecting the outside air temperature is provided at an appropriate position of the vehicle.
- a bi-directional relief valve 38 that mechanically opens when the pressure in the fuel tank 2 becomes abnormally high and when the pressure in the fuel tank 2 becomes abnormally low is sealed in the evaporated fuel passage 16. It is provided in parallel with the valve 21.
- the evaporated fuel processing apparatus of this embodiment is suitable for a hybrid vehicle capable of so-called EV traveling with the internal combustion engine 1 stopped. In this type of vehicle, there is an opportunity for purging the canister 3. Therefore, the adsorption of the evaporated fuel by the canister 3 is limited at the time of refueling.
- the evaporated fuel generated in the fuel tank 2 with refueling is introduced into the canister 3 and adsorbed by the internal adsorbent.
- the closing valve 21 is closed. Accordingly, the inside of the fuel tank 2 is kept in a sealed state separated from the canister 3, and the amount of adsorption of the canister 3 does not basically increase or decrease while the internal combustion engine 1 is stopped.
- the first purge control valve 23 is appropriately opened while the blockade valve 21 is closed, and the fuel component from the canister 3 is opened. Purge is performed. That is, air is introduced from the drain port 15 due to a pressure difference with the intake system of the internal combustion engine 1, and the fuel component purged from the adsorbent 12 by this air passes through the first purge control valve 23 and the intake passage 17 of the internal combustion engine 1. Introduced into Therefore, the amount of adsorption of the canister 3 gradually decreases during the operation of the internal combustion engine 1.
- the drain cut valve 26 is opened, the first purge control valve 23 and the second purge control valve 32 are closed, and the blocking valve 21 is closed, and the fuel tank 2 remains sealed. Left unattended.
- a predetermined time for example, about 30 to 50 minutes
- drain cut is basically performed in a state in which the positive pressure or the negative pressure existing in the fuel tank 2 or the pressurization by the pressurizing pump 27 is used to set the system to a positive pressure or a negative pressure.
- the valve 26 is closed and the system is sealed.
- the subsequent pressure change is monitored by the evaporation line pressure sensor 37 or the tank pressure sensor 36. If no pressure drop of a predetermined level is detected within a predetermined time, it is diagnosed that there is no leak.
- the temperature difference between the fuel temperature at the start of operation of the vehicle and the fuel temperature after the operation, for example, at the end of the operation is obtained, and a predetermined magnitude (eg, ⁇ 1 ° C.) is obtained regardless of whether the temperature difference is positive or negative. If it is above, the 1st leak diagnosis which does not depend on the pump 27 for pressurization will be selected as what has produced the positive pressure or the negative pressure in the fuel tank 2. FIG. If the temperature difference is less than a predetermined magnitude, there is a possibility that sufficient positive pressure or negative pressure is not generated in the fuel tank 2, so the second leak diagnosis using the pressurizing pump 27 is selected. To do.
- a predetermined magnitude eg, ⁇ 1 ° C.
- FIG. 2 is a main flowchart of the entire leak diagnosis.
- step 1 it is repeatedly determined whether or not there has been a request for the leak diagnosis.
- the process proceeds to step 2 where the temperature difference ⁇ T between the fuel temperature at the start of operation of the vehicle and the fuel temperature at the end of operation is a threshold value (for example, ⁇ 1 ° C.) or higher. If the fuel temperature rises during operation, a positive pressure is generated in the fuel tank 2, and conversely if the fuel temperature falls, the inside of the fuel tank 2 becomes negative.
- a threshold value for example, ⁇ 1 ° C.
- step 3 the process proceeds to step 3 and promotes whether the relative relationship between the outside air temperature and the fuel temperature is a direction to reduce the temperature difference ⁇ T of the fuel temperature with time. Determine if the direction. In other words, assuming that the fuel temperature has risen somewhat during operation, if the outside air temperature when the vehicle is stopped is lower than the fuel temperature, the pressure in the system can drop regardless of the leak, so a misdiagnosis is made. In order to prevent this, the first leak diagnosis is prohibited. If the outside air temperature while the vehicle is stopped is higher than the fuel temperature when the fuel temperature is increasing during operation, the temperature difference ⁇ T is promoted, so the process proceeds to step 4 and exists in the fuel tank 2. Allow the first leak diagnosis using positive pressure.
- the first leak diagnosis is prohibited in order to prevent erroneous diagnosis.
- the fuel temperature is lowered during operation, if the outside air temperature when the vehicle is stopped is lower than the fuel temperature, the temperature difference ⁇ T is promoted, so the process proceeds to step 4 and exists in the fuel tank 2.
- the first leak diagnosis using negative pressure is permitted.
- step 2 or step 3 the process proceeds to step 5 and further to step 6. Based on the detection signal of the tank pressure sensor 36, it is determined whether or not the pressure in the fuel tank 2 is a positive pressure equal to or higher than a predetermined level. It is determined whether or not the negative pressure is higher than the level. If the positive pressure is not less than the predetermined level or the negative pressure is not less than the predetermined level, the process proceeds to step 7 and the second leak diagnosis using the pressurizing pump 27 is executed.
- step 5 or step 6 If it is determined in step 5 or step 6 that the pressure in the fuel tank 2 is a positive pressure greater than a predetermined level or a negative pressure greater than a predetermined level, the process proceeds to step 8 or step 9 where the positive pressure in the fuel tank 2 or In order to eliminate the influence of the negative pressure, the pressure in the fuel tank 2 is released prior to the execution of the second leak diagnosis. Specifically, in a state where the drain cut valve 26 is open, first, the second purge control valve 32 is opened, and then the closing valve 21 is opened, so that the inside of the fuel tank 2 is brought to almost atmospheric pressure in advance. Then, after the inside of the fuel tank 2 is almost at atmospheric pressure in this way, the process proceeds to step 7 to execute the second leak diagnosis using the pressurizing pump 27.
- the second purge control valve 32 Since the second purge control valve 32 has a smaller passage area or diameter than the blockade valve 21, the second purge control valve 32 is opened before the blockade valve 21 is opened as described above. The pressure fluctuations in the air are slow, and the generation of abnormal noise can be avoided.
- FIG. 3 is a flowchart showing details of the first leak diagnosis in step 4.
- the drain cut valve 26 is closed, the blocking valve 21 is opened, the first purge control valve 23 is closed, and the second purge control is performed.
- the valve 32 be open. That is, the entire system is sealed as one space.
- step 12 the system pressure at the time when the system is sealed is read from the detection signal of the tank pressure sensor 36 or the evaporation line pressure sensor 37, and the system pressure after a predetermined time (for example, 40 minutes) is read again. Thus, a difference between them, that is, a pressure change amount ⁇ P during a predetermined time is obtained.
- this pressure change amount ⁇ P is compared with a predetermined threshold value ⁇ P1, and if there is no pressure change greater than the threshold value ⁇ P1 (a decrease in positive pressure or a decrease in negative pressure), the routine proceeds to step 14 where it is determined that there is no leak. .
- step 15 If there is a pressure change equal to or greater than the threshold value ⁇ P1, the routine proceeds to step 15 where it is determined that there is a leak, and further to step 16 in order to specify whether the leak location is on the fuel tank 2 side or the canister 3 side. Going forward, the leak diagnosis (third leak diagnosis) of the area on the fuel tank 2 side is executed. After determining whether or not there is a leak, finally, in step 17, each valve such as the blocking valve 21 is returned to the initial state.
- FIG. 4 is a flowchart showing details of the second leak diagnosis in step 7.
- the drain cut valve 26 is closed, the blocking valve 21 is opened, the first purge control valve 23 is closed, and the second purge control is performed. Let the valve 32 be open. That is, the entire system is sealed as one space.
- the pressurizing pump 27 is turned on to pressurize the system.
- step 23 it is determined whether or not the system has reached a predetermined pressure required for diagnosis. When the predetermined pressure is reached, the routine proceeds to step 24 where the pressurizing pump 27 is turned off. As a result, the entire system is pressurized.
- step 25 the internal pressure after a predetermined time (for example, 40 minutes) is read again, and the difference from the predetermined pressure when the pressurization pump 27 is stopped, that is, A pressure change amount ⁇ P during a predetermined time is obtained.
- step 26 the pressure change amount ⁇ P is compared with a predetermined threshold value ⁇ P2, and if there is no pressure drop equal to or greater than the threshold value ⁇ P2, the process proceeds to step 27 to determine that there is no leak.
- step 28 If there is a pressure drop equal to or greater than the threshold value ⁇ P2, the routine proceeds to step 28, where it is determined that there is a leak, and further to step 29 in order to identify whether the leak location is on the fuel tank 2 side or the canister 3 side. Going forward, the leak diagnosis (third leak diagnosis) of the area on the fuel tank 2 side is executed. After determining whether or not there is a leak, finally, in step 30, each valve such as the blocking valve 21 is returned to the initial state.
- the detection pressure of the tank pressure sensor 36 and the detection pressure of the evaporation line pressure sensor 37 are compared with each other, thereby closing the valve. 21 can be diagnosed as being closed (including an abnormality with a small opening). That is, since the detected pressures of both should be substantially equal in the state where the blocking valve 21 is open, it is determined that the blocking valve 21 is closed and stuck when both are separated by a predetermined allowable range or more. be able to.
- FIG. 5 is a flowchart of the third leak diagnosis in step 16 and step 29, that is, the leak diagnosis for the region closer to the fuel tank 2 than the blocking valve 21.
- the pressurizing pump 27 is turned on to pressurize the entire system.
- the block valve 21 is closed and the second purge control valve 32 is closed. Thereby, the area
- step 35 the system pressure after a predetermined time (for example, 40 minutes) has been read again, and the difference from the predetermined pressure when the pressurizing pump 27 is stopped, that is, the pressure change ⁇ P during the predetermined time is obtained.
- this pressure change amount ⁇ P is compared with a predetermined threshold value ⁇ P3, and if there is no pressure drop equal to or greater than the threshold value ⁇ P3, the routine proceeds to step 37, where it is determined that the leak location is an area on the canister 3 side. If there is a pressure drop equal to or greater than the threshold ⁇ P3, the routine proceeds to step 38, where it is determined that the leak location is an area on the fuel tank 2 side.
- the present invention is not limited to the above-described embodiment, and various modifications can be made.
- the inside of the system is pressurized by the pressurizing pump 27, but it is also possible to perform a leak diagnosis by depressurizing using the depressurizing pump.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
給油時に燃料タンク内で発生した蒸発燃料をキャニスタで吸着し、内燃機関の運転中に該内燃機関の吸気系に導入して処理する蒸発燃料処理装置において、
上記燃料タンクと上記キャニスタとを含む系内を加圧もしくは減圧するポンプと、
系内の圧力を検出する少なくとも1つの圧力センサと、
上記燃料タンクにおける燃料の温度を検出する燃温センサと、
を備え、
リーク診断要求に対し、運転開始時の燃料温度と運転後の燃料温度との温度差に基づき、燃料タンク内に存在する正圧もしくは負圧を用いた第1のリーク診断と、上記ポンプによる強制的な加圧もしくは減圧を用いた第2のリーク診断と、を選択する。
Claims (5)
- 給油時に燃料タンク内で発生した蒸発燃料をキャニスタで吸着し、内燃機関の運転中に該内燃機関の吸気系に導入して処理する蒸発燃料処理装置において、
上記燃料タンクと上記キャニスタとを含む系内を加圧もしくは減圧するポンプと、
系内の圧力を検出する少なくとも1つの圧力センサと、
上記燃料タンクにおける燃料の温度を検出する燃温センサと、
を備え、
リーク診断要求に対し、運転開始時の燃料温度と運転後の燃料温度との温度差に基づき、燃料タンク内に存在する正圧もしくは負圧を用いた第1のリーク診断と、上記ポンプによる強制的な加圧もしくは減圧を用いた第2のリーク診断と、を選択する、蒸発燃料処理装置の診断装置。 - リーク診断要求時における外気温と燃料温度との相対的な関係が、上記の燃料温度の温度差を経時的に縮小する方向にあるときは、上記第1のリーク診断を禁止する、請求項1に記載の蒸発燃料処理装置の診断装置。
- 上記温度差に基づき上記第2のリーク診断を選択したときに、系内が所定レベル以上の正圧もしくは負圧にあれば、ポンプの作動に先行して系内の圧力開放処理を実行する、請求項1または2に記載の蒸発燃料処理装置の診断装置。
- 上記燃料タンクから上記キャニスタに至る蒸発燃料通路に設けられた封鎖弁を備え、
上記第1のリーク診断もしくは上記第2のリーク診断によってリークを検出したときに、上記封鎖弁により区画される燃料タンク側の領域のリーク診断、または上記封鎖弁により区画されるキャニスタ側の領域のリーク診断を上記ポンプを用いて行う、請求項1~3のいずれかに記載の蒸発燃料処理装置の診断装置。 - 上記燃料タンクから上記キャニスタに至る蒸発燃料通路に設けられた封鎖弁を備え、
上記圧力開放処理は、上記封鎖弁よりも通路面積の小さな電磁弁の開弁により燃料タンク内を大気圧に近付けてから上記封鎖弁を開弁する、請求項3に記載の蒸発燃料処理装置の診断装置。
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US15/739,020 US10184430B2 (en) | 2015-06-23 | 2015-06-23 | Diagnostic device for evaporated fuel processing device |
EP15896286.0A EP3315756B1 (en) | 2015-06-23 | 2015-06-23 | Diagnostic device for evaporated fuel processing device |
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US20180171938A1 (en) | 2018-06-21 |
CN107709745A (zh) | 2018-02-16 |
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