WO2015076027A1 - 蒸発燃料処理装置 - Google Patents
蒸発燃料処理装置 Download PDFInfo
- Publication number
- WO2015076027A1 WO2015076027A1 PCT/JP2014/076542 JP2014076542W WO2015076027A1 WO 2015076027 A1 WO2015076027 A1 WO 2015076027A1 JP 2014076542 W JP2014076542 W JP 2014076542W WO 2015076027 A1 WO2015076027 A1 WO 2015076027A1
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- WIPO (PCT)
- Prior art keywords
- valve
- internal pressure
- fuel tank
- stroke amount
- stroke
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- 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
- F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
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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
- F02M25/0836—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
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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
- F02M25/0854—Details of the absorption canister
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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
- 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 including a canister that includes an adsorbent that adsorbs evaporative fuel generated in a fuel tank, and a block valve provided in a vapor passage that connects the canister and the fuel tank.
- This evaporative fuel processing apparatus includes a block valve (control valve) in a vapor passage that connects a canister and a fuel tank.
- the blocking valve includes a dead zone area (valve closing area) for blocking evaporated fuel and a conduction area (valve opening area) for allowing evaporated fuel to pass, and holds the fuel tank in a closed state in the closed state, In the open state, the fuel tank evaporative fuel is allowed to escape to the canister side, and the internal pressure of the fuel tank can be reduced.
- the evaporative fuel processing device changes the opening of the blocking valve from the closed position to the opening direction at a predetermined speed, and when the internal pressure of the fuel tank starts to decrease, the opening of the blocking valve is set as the opening start position. Learning control is stored.
- the detection timing of the internal pressure drop of the fuel tank is delayed with respect to the opening start timing of the block valve. For this reason, in the learning method of gradually changing the stroke amount, which is the axial distance of the valve movable portion with respect to the valve seat, when the internal pressure drop of the fuel tank is detected, the block valve is slightly opened from the valve opening start position. Can be considered. That is, there is a problem that the accuracy of learning control of the valve opening start position in the blocking valve is low.
- the present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is to improve the learning accuracy of the valve opening start position in the blocking valve.
- an evaporative fuel treatment includes a canister that includes an adsorbent that adsorbs the evaporated fuel generated in the fuel tank, and a block valve provided in a vapor passage that connects the canister and the fuel tank.
- the block valve is capable of holding the fuel tank in a closed state when the stroke amount, which is the axial distance of the valve movable portion with respect to the valve seat, is within a predetermined range from zero, The stroke amount is changed in the valve opening direction so that the valve opening start position can be learned based on the stroke amount when the internal pressure of the fuel tank decreases by a predetermined value or more.
- the valve In learning of the start position, the valve is changed in the valve opening direction by the first predetermined stroke and maintained for the first time, and then in the valve closing direction by a second predetermined stroke smaller than the first predetermined stroke.
- the step of changing the stroke amount in the valve opening direction by repeating the step of maintaining the second time longer than the first time by changing the internal pressure of the fuel tank to a predetermined value or more, or the previous step
- the valve opening start position is determined based on the stroke amount in the second time maintaining state.
- the previous process includes not only the previous process but also the previous process.
- the stroke amount of the valve movable portion is changed in the valve opening direction and maintained for the first time, and is smaller than the valve opening direction (second predetermined stroke). Only the step of changing in the valve closing direction and maintaining the second time longer than the first time is repeated, and the stroke amount is changed stepwise in the valve opening direction. For this reason, at the valve opening start position of the block valve, the flow path is returned from the open state to the closing direction, so that the response of the internal pressure change in the fuel tank is improved and the actual valve opening start is started. The time lag between the start time and the valve opening start determination time (fuel tank internal pressure drop detection timing) is reduced, and the learning accuracy can be improved.
- the stroke amount of the valve movable portion is changed to the valve closing position at the timing when it is detected that the internal pressure of the fuel tank has decreased by a predetermined value or more.
- the detection period of the internal pressure of the fuel tank is shorter than the first time. That is, since the internal pressure of the fuel tank can be detected in a relatively short cycle, the deviation between the actual internal pressure of the fuel tank and the detected value is reduced.
- the control for changing the stroke amount of the blocking valve in learning of the valve opening start position of the blocking valve, there is a control for changing the stroke amount of the blocking valve and a control for detecting that the internal pressure of the fuel tank has decreased by a predetermined value or more. Done independently. Further, the control cycle of the control for detecting that the internal pressure of the fuel tank has decreased by a predetermined value or more is set to a value smaller than the control cycle of the control for changing the stroke amount of the blocking valve. For this reason, compared with the case where the control cycle of the control for detecting that the internal pressure of the fuel tank has decreased by a predetermined value or more is matched with the control for changing the stroke amount of the block valve, learning of the valve opening start position of the block valve is performed. It can finish early.
- the temporary learning flag is turned on when it is detected that the internal pressure of the fuel tank has decreased by a value smaller than a predetermined value, and the internal pressure of the fuel tank is continuously decreasing Then, when the internal pressure of the fuel tank is reduced by a predetermined value or more in the subsequent process, the valve is opened based on the stroke amount in the second time maintaining state in the process when the temporary learning flag is turned on or in the previous process. The starting position is determined. Thereby, even if the internal pressure of the fuel tank is low and the internal pressure of the tank gradually decreases even when the opening of the closing valve starts, the opening start position of the closing valve can be learned with high accuracy.
- the valve opening is started based on the stroke amount in the second time maintaining state in the process when the internal pressure of the fuel tank decreases by a predetermined value or more, or the process when the temporary learning flag is turned on.
- a value based on the difference between the first predetermined stroke and the second predetermined stroke is subtracted from the stroke amount, and the process immediately before the internal pressure of the fuel tank drops by a predetermined value or more, or the temporary
- the valve opening start position is determined based on the stroke amount in the second time maintaining state in the process immediately before the learning flag is turned on, the difference between the first predetermined stroke and the second predetermined stroke is determined as the stroke amount.
- a value based on is added. For this reason, the learning accuracy of the valve opening start position of the blocking valve is improved.
- the learning accuracy of the valve opening start position in the blocking valve can be improved.
- FIG. 1 is an overall configuration diagram of an evaporated fuel processing apparatus according to Embodiment 1 of the present invention. It is a longitudinal cross-sectional view showing the initialization state of the blocking valve used with the said fuel vapor processing apparatus. It is a longitudinal cross-sectional view showing the valve closing state of the said blocking valve. It is a longitudinal cross-sectional view showing the valve opening state of the said blocking valve. It is a graph showing the learning control which learns the valve opening start position of the said blocking valve.
- FIG. 6 is a graph I showing learning control of the VI arrow portion of FIG. 5.
- FIG. 6 is a graph II showing learning control of the VI arrow portion of FIG. 5. It is a graph showing the learning control which concerns on the example of a change.
- the evaporated fuel processing apparatus 20 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 14.
- the fuel vapor processing apparatus 20 of this embodiment is provided in a vehicle engine system 10, and prevents fuel vapor generated in a fuel tank 15 of the vehicle from leaking outside. Device.
- the evaporated fuel processing apparatus 20 includes a canister 22, a vapor passage 24 connected to the canister 22, a purge passage 26, and an atmospheric passage 28.
- Activated carbon (not shown) as an adsorbent is loaded in the canister 22 so that the evaporated fuel in the fuel tank 15 can be adsorbed by the adsorbent.
- One end portion (upstream end portion) of the vapor passage 24 is communicated with an air layer portion in the fuel tank 15, and the other end portion (downstream end portion) of the vapor passage 24 is communicated with the inside of the canister 22. .
- a sealing valve 40 (described later) that communicates and blocks the vapor passage 24 is interposed in the vapor passage 24.
- One end (upstream end) of the purge passage 26 communicates with the inside of the canister 22, and the other end (downstream end) of the purge passage 26 is connected to the throttle valve 17 in the intake passage 16 of the engine 14. Is also communicated with the downstream passage.
- a purge valve 26v for communicating and blocking the purge passage 26 is interposed in the middle of the purge passage 26, a purge valve 26v for communicating and blocking the purge passage 26 is interposed.
- the canister 22 is connected to the atmospheric passage 28 through an OBD component 28v used for failure detection.
- An air filter 28a is interposed in the middle of the atmospheric passage 28, and the other end of the atmospheric passage 28 is open to the atmosphere.
- the block valve 40, the purge valve 26v, and the OBD component 28v are controlled based on a signal from the ECU 19. Further, a signal from a tank internal pressure sensor 15p for detecting
- the purge valve 26v is controlled to open and close while the canister 22 is in communication with the atmosphere through the atmosphere passage 28.
- the purge valve 26v is opened, the intake negative pressure of the engine 14 acts in the canister 22 via the purge passage 26. As a result, air flows from the atmospheric passage 28 into the canister 22.
- the block valve 40 operates in the valve opening direction, and the pressure relief control of the fuel tank 15 is performed. As a result, the gas in the fuel tank 15 flows into the canister 22 from the vapor passage 24.
- the adsorbent in the canister 22 is purged by air or the like flowing into the canister 22, and the evaporated fuel separated from the adsorbent is guided to the intake passage 16 of the engine 14 together with air and burned in the engine 14. .
- the block valve 40 is a flow rate control valve that blocks the vapor passage 24 in the closed state and controls the flow rate of the gas flowing through the vapor passage 24 in the open state.
- the valve casing 42 includes a valve chamber 44, an inflow path 45, and an outflow path 46, thereby forming a series of inverted L-shaped fluid passages 47.
- a valve seat 48 is formed concentrically on the lower surface of the valve chamber 44, that is, on the mouth edge of the upper end opening of the inflow passage 45.
- the stepping motor 50 is installed on the valve casing 42.
- the stepping motor 50 has a motor main body 52 and an output shaft 54 that protrudes from the lower surface of the motor main body 52 and is configured to be rotatable forward and backward.
- the output shaft 54 is disposed concentrically within the valve chamber 44 of the valve casing 42, and a male screw portion 54 n is formed on the outer peripheral surface of the output shaft 54.
- the valve guide 60 is formed in a cylindrical cylindrical shape from a cylindrical tube wall portion 62 and an upper wall portion 64 that closes the upper end opening of the tube wall portion 62.
- a cylindrical shaft portion 66 is formed concentrically at the center of the upper wall portion 64, and a female screw portion 66 w is formed on the inner peripheral surface of the cylindrical shaft portion 66.
- the valve guide 60 is disposed so as to be movable in the axial direction (vertical direction) with respect to the valve casing 42 in a state in which the valve guide 42 is prevented from rotating in the direction around the axis by a detent means (not shown).
- a male threaded portion 54n of the output shaft 54 of the stepping motor 50 is screwed into the female threaded portion 66w of the cylindrical shaft portion 66 of the valve guide 60, and based on forward and reverse rotation of the output shaft 54 of the stepping motor 50.
- the valve guide 60 is configured to be movable up and down in the vertical direction (axial direction).
- an auxiliary spring 68 for biasing the valve guide 60 upward is interposed.
- the valve body 70 is formed in a cylindrical shape with a bottom from a cylindrical tube wall portion 72 and a lower wall portion 74 that closes a lower end opening of the tube wall portion 72.
- a seal member 76 made of, for example, a disk-like rubber-like elastic material is attached to the lower surface of the lower wall portion 74.
- the valve body 70 is disposed concentrically within the valve guide 60, and the seal member 76 of the valve body 70 is disposed so as to be able to contact the upper surface of the valve seat 48 of the valve casing 42.
- On the outer peripheral surface of the upper end of the cylindrical wall portion 72 of the valve body 70 a plurality of connecting projections 72t are formed in the circumferential direction.
- connection convex part 72t of the valve body 70 is fitted to the longitudinally grooved connection concave part 62m formed on the inner peripheral surface of the cylindrical wall part 62 of the valve guide 60 in a state where it can be relatively moved in the vertical direction by a certain dimension.
- the valve guide 60 and the valve body 70 are integrally and upwardly (in the valve opening direction) with the bottom wall portion 62b of the connection recess 62m of the valve guide 60 in contact with the connection protrusion 72t of the valve body 70 from below. ) Can be moved.
- valve body 70 that constantly urges the valve body 70 downward, that is, in a valve closing direction with respect to the valve guide 60, between the upper wall portion 64 of the valve guide 60 and the lower wall portion 74 of the valve body 70.
- a spring 77 is interposed concentrically.
- the blocking valve 40 rotates the stepping motor 50 by a predetermined number of steps in the valve opening direction or the valve closing direction based on the output signal from the ECU 19. Then, the stepping motor 50 rotates by a predetermined number of steps, so that the male screw portion 54n of the output shaft 54 of the stepping motor 50 and the female screw portion 66w of the tube shaft portion 66 of the valve guide 60 are screwed together.
- the valve guide 60 moves in a vertical direction by a predetermined stroke amount. In the blocking valve 40, for example, the number of steps is set to about 200 Step and the stroke amount is set to about 5 mm in the fully opened position.
- the valve guide 60 In the initialized state (initial state) of the blocking valve 40, as shown in FIG. 2, the valve guide 60 is held at the lower limit position, and the lower end surface of the cylindrical wall portion 62 of the valve guide 60 is the valve seat 48 of the valve casing 42. It is in contact with the upper surface of.
- the connecting projection 72 t of the valve body 70 is positioned above the bottom wall 62 b of the connecting recess 62 m of the valve guide 60, and the seal member 76 of the valve body 70 is connected to the valve spring 77. It is pressed against the upper surface of the valve seat 48 of the valve casing 42 by the spring force. That is, the blocking valve 40 is held in a fully closed state.
- the number of steps of the stepping motor 50 is 0 Step, and the movement amount of the valve guide 60 in the axial direction (upward direction), that is, the stroke amount in the valve opening direction is 0 mm.
- the stepping motor 50 of the blocking valve 40 rotates, for example, 4 steps from the initialized state in the valve opening direction.
- the valve guide 60 moves upward by about 0.1 mm by the screwing action of the male threaded portion 54n of the output shaft 54 of the stepping motor 50 and the female threaded portion 66w of the cylindrical shaft portion 66 of the valve guide 60, and the valve casing 42
- the valve seat 48 is held in a floating state. This makes it difficult to apply an excessive force between the valve guide 60 of the blocking valve 40 and the valve seat 48 of the valve casing 42 due to environmental changes such as temperature.
- the seal member 76 of the valve body 70 is pressed against the upper surface of the valve seat 48 of the valve casing 42 by the spring force of the valve spring 77.
- valve guide 60 moves upward by the screwing action of the male screw portion 54n and the female screw portion 66w, and as shown in FIG.
- the bottom wall portion 62b of the connection recess 62m of the guide 60 abuts on the connection projection 72t of the valve body 70 from below.
- the valve guide 60 further moves upward, the valve body 70 moves upward together with the valve guide 60 as shown in FIG. 4, and the seal member 76 of the valve body 70 moves from the valve seat 48 of the valve casing 42. Get away. Thereby, the blocking valve 40 is opened.
- the valve opening start position of the sealing valve 40 is determined by the position tolerance of the connecting convex portion 72t formed in the valve body 70, the position tolerance of the bottom wall portion 62b formed in the connecting concave portion 62m of the valve guide 60, and the like. Since each valve 40 is different, it is necessary to accurately learn the valve opening start position. This learning is performed in the learning control, and the valve opening is started based on the timing when the internal pressure of the fuel tank 15 decreases by a predetermined value or more while rotating the stepping motor 50 of the blocking valve 40 in the valve opening direction (increasing the number of steps). The number of position steps is detected.
- valve guide 60 corresponds to the valve movable portion of the present invention
- valve guide 60 and the valve body 70 are in the present invention. It corresponds to the valve moving part.
- the learning control of the valve opening start position of the blocking valve 40 will be described with reference to FIGS.
- the learning control is performed when the ignition switch of the engine is turned on while the vehicle is parked.
- the upper diagram of FIG. 5 represents the change in the number of steps of the stepping motor 50 with respect to time (horizontal axis), that is, the stroke amount (amount of movement in the axial direction) of the valve guide 60 and the valve body 70. Yes. For this reason, the number of steps and the stroke amount will be used as synonyms hereinafter.
- the lower diagram of FIG. 5 represents a change in the internal pressure (tank internal pressure) of the fuel tank 15 with time as a reference (horizontal axis).
- the tank internal pressure is detected at regular intervals ( ⁇ Ts).
- the stepping motor 50 is rotated in the valve opening direction, for example, by 4 Steps, and the valve guide 60 is held in a state of being lifted about 0.1 mm from the valve seat 48 of the valve casing 42.
- the stepping motor 50 rotates 4 steps ( ⁇ 4 steps) in the valve closing direction, and the block valve 40 is returned to the initialized state (0 step).
- the stepping motor 50 rotates at high speed in the valve opening direction to the designed valve closing limit position S0Step of the blocking valve 40.
- the valve guide 60 moves upward to the valve closing limit position relatively quickly, and the learning time can be shortened.
- the seal member 76 of the valve body 70 is in contact with the upper surface of the valve seat 48 of the valve casing 42 by the spring force of the valve spring 77, and the closing valve 40 is in a closed state.
- the stepping motor 50 rotates in the valve opening direction to the closing limit position S0Step of the block valve 40, the stepping motor 50 stops and this state is maintained for a certain time T1 (for example, 500 msec) (see the upper diagram of FIG. 5). ).
- the stepping motor 50 rotates in the valve closing direction by BStep (for example, ⁇ 2 Step), and this state is maintained for a predetermined time T2 (for example, 1 sec).
- the tank internal pressure is detected at a predetermined timing while the stepping motor 50 is maintained for a predetermined time T2.
- the stepping motor 50 is rotated in the valve opening direction by AStep (for example, 4 Step) and maintained for a certain time T1 (for example, 500 msec)
- the stepping motor 50 is moved to BStep ( For example, it rotates in the valve closing direction by ⁇ 2 Step) and is maintained for a certain time T2 (for example, 1 sec).
- the tank internal pressure is detected at a predetermined timing while the stepping motor 50 is maintained for a predetermined time T2.
- the stroke amount A in the current valve opening direction and the valve closing direction in the previous stroke amount (S0-2) Step are set.
- the tank internal pressure detection cycle ( ⁇ Ts) is set equal to the learning cycle in which the stepping motor 50 rotates in the valve opening direction and is maintained for a certain time T1, and is rotated in the valve closing direction and maintained for a certain time T2. ing.
- the tank internal pressure detected this time is decreased by a predetermined value ( ⁇ P1) or more with respect to the previous detection value (see timing Ts3) as shown in the tank internal pressure graph of FIG. If it does (see timing Ts4), it is determined that the opening of the blocking valve 40 has started.
- the learning flag is turned on at timing Ts4.
- the learning value Sx of the start position is stored, and the learning control ends.
- the predetermined value ( ⁇ P1) which is the amount of change in the tank internal pressure used to determine the valve opening start position of the blocking valve 40, is the variation in the characteristics of the tank internal pressure sensor 15p, the liquid in the fuel tank 15 due to vehicle running, etc.
- the value is set to about 0.3 kPa.
- the state in which the stepping motor 50 is rotated in the valve opening direction by AStep corresponds to the state in which the valve movable portion of the present invention is changed in the valve opening direction by the first predetermined stroke.
- the state in which 50 is rotated in the valve closing direction by BStep corresponds to the state in which the valve movable portion of the present invention is changed in the valve closing direction by the second predetermined stroke.
- the fixed time T1 (for example, 500 msec) corresponds to the first time of the present invention
- the fixed time T2 for example, 1 sec) corresponds to the second time of the present invention.
- the stepping motor 50 in learning the valve opening start position of the blocking valve 40, the stepping motor 50 is rotated in the valve opening direction by AStep (for example, 4 Steps) for a predetermined time T1 (for example, 500 msec).
- T1 for example, 500 msec
- the step of rotating the stepping motor 50 in the valve closing direction by BStep (for example, 2Step) and maintaining for a certain time T2 (for example, 1 second) is repeated step by step, and the valve guide 60 and the valve body 70 (valve) The stroke amount of the movable part) is changed in the valve opening direction.
- the flow path is returned from the opened state to the closing direction, so that the response of the internal pressure change in the fuel tank 15 is improved, and the actual valve opening is performed.
- the time lag between the start time and the valve opening start determination time is reduced, and the learning accuracy can be improved.
- ⁇ Modification 1> The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the gist of the present invention.
- the tank internal pressure can also be detected at all times.
- ⁇ P1 a predetermined value
- Tsx the learning flag is turned on regardless of the learning cycle.
- the stepping motor 50 of the block valve 40 is rotated in the valve closing direction by XStep to return the valve guide 60 and the valve body 70 to the valve closing position.
- the internal pressure (tank internal pressure) of the fuel tank 15 is detected at regular intervals ( ⁇ Ts) in accordance with the learning cycle, and the tank reference pressure is smaller than a predetermined value ( ⁇ P1).
- ⁇ P01 a predetermined value
- the tank internal pressure while the stepping motor 50 is rotated in the valve closing direction by BStep (for example, ⁇ 2 Step) and maintained for a certain time T2 (for example, 1 sec) is as shown in the tank internal pressure graph of FIG.
- Ts2 for example, 1 sec
- the number of steps of the stepping motor 50 is S3Step as shown in the upper diagram of FIG. 9, but the update of the stroke amount is prohibited when the temporary learning flag is turned on. That is, the stroke amount (S2 Step) updated in the previous process is suspended.
- the stepping motor 50 is rotated in the valve opening direction by AStep (for example, 4 Step) and maintained for a certain time T1 (for example, 500 msec)
- the stepping motor 50 is moved in the valve closing direction by BStep (for example, ⁇ 2 Step). It rotates and is maintained for a certain time T2 (for example, 1 sec).
- Ts4 for example, 1 sec
- FIG. 9 shows an example in which the update of the stroke amount is prohibited when the temporary learning flag is turned on, but as shown in FIG. 10, the stroke amount even when the temporary learning flag is turned on at timing Ts3.
- Is also possible by updating S2Step to S3Step and subtracting (AB-1 1) Step from the updated stroke amount (S3Step) when the learning flag is turned on in the next step (see timing Ts4) It is.
- FIGS. 9 and 10 show examples in which the internal pressure of the fuel tank 15 (tank internal pressure) is detected at regular intervals ( ⁇ Ts).
- the tank internal pressure can always be detected, and when the tank internal pressure has decreased by a predetermined value ( ⁇ P1) or more (see timing Tsx) with respect to the previous detection value (see timing Ts4), learning is performed. It is also possible to turn on the flag.
- the temporary learning flag is turned on at a timing (see timing Ts3) when the tank internal pressure is lower than the first reference value ( ⁇ P01) during a certain period ( ⁇ Ts), and the tank internal pressure is
- Ts3 when the tank internal pressure is lower than the first reference value ( ⁇ P01) during a certain period ( ⁇ Ts)
- ⁇ Ts the tank internal pressure
- Ts4 that falls within a predetermined value ( ⁇ P1) within ⁇ Ts).
- the temporary learning flag is turned on at a timing (see timing Ts4) when the tank internal pressure drops below the first reference value ( ⁇ P01) during a certain period ( ⁇ Ts), and the next process (a certain period) (During ( ⁇ Ts))
- a learning flag when the sum of the value in which the tank internal pressure has decreased and the value in which the tank internal pressure has decreased in the previous process, that is, the integrated amount of decrease in tank internal pressure is greater than or equal to a predetermined value ( ⁇ P1) It is also possible to turn on. Furthermore, as shown in FIG. 13, it is possible to always detect the tank internal pressure, and it is also possible to turn on the learning flag when the tank internal pressure decrease amount integrated value becomes equal to or greater than a predetermined value ( ⁇ P1) (see timing Tsx). It is.
- ⁇ Modification 3> When the tank internal pressure is low, it may be considered that it takes a long time for the tank internal pressure to gradually decrease and decrease by a predetermined value ( ⁇ P1) or more even when the opening of the blocking valve 40 is started. Even in such a case, in order to accurately perform the learning control, as shown in FIG. 14, after the provisional learning flag is turned on, the state of decrease in the tank internal pressure is monitored, and the integrated amount of decrease in the tank internal pressure is obtained. The learning flag is turned on when the predetermined value ( ⁇ P1) or more is reached.
- the temporary learning flag is turned on at this timing Ts3.
- the number of steps (stroke amount) of the stepping motor 50 is S3Step as shown in the upper diagram of FIG. 14, but the update of the stroke amount is prohibited when the temporary learning flag is turned on. That is, the stroke amount (S2 Step) updated in the previous process is suspended.
- the tank internal pressure drop in the next step that is, when the second reference value ( ⁇ P02) is larger than the first reference value ( ⁇ P01
- the temporary learning flag is kept on.
- the temporary learning flag is kept on.
- the learning flag is turned on when the tank internal pressure decrease amount integrated value becomes equal to or greater than a predetermined value ( ⁇ P1).
- (AB-1 1) Step is added to the stroke amount (S2 Step) held by the temporary learning flag being turned on, and the value is stored as the learning value Sx of the valve opening start position.
- Learning control ends.
- the stepping motor 50 of the blocking valve 40 rotates in the valve closing direction by XStep, and the valve guide 60 and the valve body 70 are returned to the valve closing position.
- the temporary learning flag is turned on, for example, when the tank internal pressure drop in the next step, that is, the second reference value ( ⁇ P02) becomes smaller than the first reference value ( ⁇ P01), the blockage is performed. It is determined that the internal pressure of the tank is not lowered due to the start of opening of the valve 40, and the temporary learning flag is turned off.
- the stepping motor 50 is rotated in the valve opening direction by AStep (for example, 4 Step) and maintained for a certain time T1 (for example, 500 msec), and the stepping motor 50 is moved in the valve closing direction by BStep (for example, ⁇ 2 Step).
- AStep for example, 4 Step
- T1 for example, 500 msec
- BStep for example, ⁇ 2 Step
- the example shows that the tank internal pressure is detected at a predetermined timing while rotating and maintaining for a certain time T2 (for example, 1 sec) and for a certain time T2.
- T2 for example, 1 sec
- T2 for example, 1 sec
- the fixed time T1 when rotating in the valve opening direction and the fixed time T2 when rotating in the valve closing direction can be appropriately changed.
- the stepping motor 50 is used as the motor of the blocking valve 40
- a DC motor or the like can be used instead of the stepping motor 50.
- the fuel vapor processing apparatus 20 according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 15 to 19.
- the control for changing the stroke amount of the blocking valve 40 hereinafter referred to as stroke control
- the control to detect hereinafter referred to as internal pressure detection control
- the stroke control of the blocking valve 40 is executed based on the flowchart of FIG.
- the process shown in the flowchart of FIG. 15 is repeatedly executed at predetermined intervals Tx based on a program stored in the memory of the ECU 19 (see FIG. 1).
- the internal pressure detection control in the learning control is executed based on the flowchart of FIG.
- the process shown in the flowchart of FIG. 16 is repeatedly executed at predetermined intervals Tv based on a program stored in the memory of the ECU 19.
- the graph of FIG. 17 is a graph showing the change over time of the stroke control and the internal pressure detection control of the blocking valve 40.
- the stepping motor 50 of the blocking valve 40 is closed in the valve opening direction. The state after rotating to the limit position S0Step is shown in detail.
- FIG. 16 is started in the state in which the closing valve 40 exists in the valve closing limit position S0Step (stroke amount S0) (refer the upper timing T1 of FIG. 17). That is, in step S101 in FIG. 15, it is determined whether or not the stepping motor 50 of the block valve 40 has rotated in the valve opening direction by AStep (for example, 4 Step) (the block valve 40 operates in the AStep valve opening direction). At timing T1 in FIG. 17, since the closing valve 40 is before the AStep valve opening operation, the determination in step S101 in FIG.
- step S111 the tank internal pressure PD1 at this timing is stored (step S110), and further the closing valve A process of moving 40 in the AStep valve opening direction is performed (step S111), and the current process ends.
- the current tank internal pressure P is compared with the tank internal pressure PD1 stored at the timing T1 in FIG. 17 in step S202.
- the current tank internal pressure P has not decreased by ⁇ P1 or more from the tank internal pressure PD1, so the determination in step S202 is NO.
- step S101 it is determined whether or not the closing valve 40 has moved in the valve closing direction by BStep (for example, ⁇ 2Step).
- BStep for example, ⁇ 2Step
- the determination in step S102 in FIG. 15 is NO, and in step S113, a process for operating the blocking valve 40 in the BStep valve closing direction is performed.
- step S101, S102 YES It is determined whether the time Y has elapsed after the valve direction operation.
- the current process is terminated. In this way, when the process of steps S101, S102, and S103 in FIG.
- step S104 the current tank internal pressure P and timing T1 are reached in step S104.
- the stored tank internal pressure PD1 is compared.
- the determination in step S104 is NO.
- the opening / closing execution history of the blocking valve 40 is cleared.
- the learned value is the stroke amount difference between the current AStep opening direction operation and the BStep closing direction operation (A) at the designed valve closing limit position S0Step (stroke amount S0) of the blocking valve 40.
- -B 2) Updated to the value S1 obtained by adding Step.
- step S101 the tank internal pressure PD2 is stored at the timing T7 in FIG. 17 (step S110), and the AStep valve opening direction operation of the block valve 40 is performed (step S111). Then, as in the case of timing T2 to timing T6 described above, after the AStep opening state of the blocking valve 40 is maintained for the time Tx, the BStep closing direction operation of the blocking valve 40 is performed, and the BStep closing state is changed. Only time Y is maintained.
- step S204 the block valve 40 is returned by 8 Steps in the valve closing direction, and the block valve 40 is closed.
- the learning control completion time is delayed by the time from the timing T10b to the timing T12 of FIG. 17 with respect to the process of the flowchart of FIG. Note that the processing of the flowchart of FIG. 15 may be terminated when the learning completion processing or the like is performed in the processing of the flowchart of FIG.
- step S301 in FIG. 18 the determination in step S301 in FIG. 18 is YES, and the tank internal pressure PD1 at the timing T1 in FIG. 19 is stored (step S303). Further, the AStep valve opening direction operation of the blocking valve 40 is performed (step S304), and the current process is completed.
- step S201 and step S202 are repeatedly executed at a predetermined cycle Tv.
- step S301 is NO. It becomes. Furthermore, since the determination in step S302 is also NO, in step S305, the BStep valve closing direction operation of the blocking valve 40 is performed, and the current process is completed.
- step S3 the time Y has not elapsed since the BStep valve closing direction operation was performed (NO in step S301), and the BStep valve closing direction operation has ended (YES in step S302). Exit. Then, when the process of steps S301 and S302 in FIG.
- step S301 the determination in step S301 is YES. For this reason, the tank internal pressure PD2 at the timing T6 in FIG. 19 is stored (step S303). Further, the AStep valve opening direction operation of the blocking valve 40 is performed (step S304).
- the operation of maintaining the AStep valve opening direction state for the time Tx and maintaining the BStep valve closing direction state for the time Y can be repeatedly executed. For this reason, as in the process shown in the flowchart of FIG. 15, the process of canceling the opening / closing history of the blocking valve 40 becomes unnecessary, and immediately after the time Y has elapsed after the BStep valve closing direction operation of the blocking valve 40 ends. AStep valve opening direction operation can be performed. For this reason, the time required for learning control can be shortened. Then, as shown at timing T9b in FIG. 19, when the current tank internal pressure P decreases by ⁇ P1 or more from the tank internal pressure PD2 at timing T6 in FIG.
- step S203 learning completion processing is performed in step S203.
- time Tx> time Tv the specific value can be changed as appropriate.
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Abstract
Description
以下、図1から図14に基づいて本発明の実施形態1に係る蒸発燃料処理装置20の説明を行なう。本実施形態の蒸発燃料処理装置20は、図1に示すように、車両のエンジンシステム10に備えられており、車両の燃料タンク15で発生した蒸発燃料が外部に漏れ出ないようにするための装置である。
蒸発燃料処理装置20は、図1に示すように、キャニスタ22と、そのキャニスタ22に接続されたベーパ通路24、パージ通路26、及び大気通路28とを備えている。キャニスタ22内には、吸着材としての活性炭(図示省略)が装填されており、燃料タンク15内の蒸発燃料を前記吸着材により吸着できるように構成されている。ベーパ通路24の一端部(上流側端部)は、燃料タンク15内の気層部と連通されており、ベーパ通路24の他端部(下流側端部)がキャニスタ22内と連通されている。そして、ベーパ通路24の途中にはベーパ通路24を連通・遮断する封鎖弁40(後記する)が介装されている。また、パージ通路26の一端部(上流側端部)は、キャニスタ22内と連通されており、パージ通路26の他端部(下流側端部)がエンジン14の吸気通路16におけるスロットルバルブ17よりも下流側通路部と連通されている。そして、パージ通路26の途中にはパージ通路26を連通・遮断するパージ弁26vが介装されている。
さらに、キャニスタ22は故障検出に使用されるOBD用部品28vを介して大気通路28が連通されている。大気通路28の途中にはエアフィルタ28aが介装されており、大気通路28の他端部は大気に開放されている。前記封鎖弁40、パージ弁26v及びOBD用部品28vは、ECU19からの信号に基づいて制御される。さらに、ECU19には、燃料タンク15内の圧力を検出するタンク内圧センサ15p等の信号が入力される。
次に、蒸発燃料処理装置20の基本的動作について説明する。車両の駐車中は、封鎖弁40が閉弁状態に維持される。このため、燃料タンク15の蒸発燃料がキャニスタ22内に流入することはない。そして、駐車中に車両のイグニッションスイッチがオンされると、封鎖弁40の開弁開始位置を学習する学習制御が行われる(後記する)。また、車両の駐車中は、パージ弁26vは閉弁状態に維持されてパージ通路26は遮断状態となり、大気通路28は連通状態に維持される。車両の走行中は、所定のパージ条件が成立する場合に、ECU19がキャニスタ22に吸着されている蒸発燃料をパージさせる制御を実行する。この制御では、キャニスタ22を大気通路28により大気に連通させたまま、パージ弁26vが開閉制御される。パージ弁26vが開弁されると、エンジン14の吸気負圧がパージ通路26を介してキャニスタ22内に作用する。これにより、キャニスタ22内に大気通路28から空気が流入するようになる。さらに、パージ弁26vが開弁されると、封鎖弁40が開弁方向に動作して燃料タンク15の圧抜き制御が行なわれる。これにより、キャニスタ22内にベーパ通路24から燃料タンク15内の気体が流入するようになる。この結果、キャニスタ22内の吸着材がキャニスタ22に流入する空気等によりパージされ、前記吸着材から離脱した蒸発燃料が空気と共にエンジン14の吸気通路16に導かれて、エンジン14内で燃焼される。
封鎖弁40は、閉弁状態でベーパ通路24を封鎖し、開弁状態でベーパ通路24を流れる気体の流量を制御する流量制御弁であり、図2に示すように、バルブケーシング42とステッピングモータ50とバルブガイド60とバルブ体70とを備えている。バルブケーシング42には、弁室44、流入路45及び流出路46により、一連状をなす逆L字状の流体通路47が構成されている。また、弁室44の下面すなわち流入路45の上端開口部の口縁部には、弁座48が同心状に形成されている。前記ステッピングモータ50は、前記バルブケーシング42の上部に設置されている。前記ステッピングモータ50は、モータ本体52と、そのモータ本体52の下面から突出し、正逆回転可能に構成された出力軸54を有している。出力軸54は、バルブケーシング42の弁室44内に同心状に配置されており、その出力軸54の外周面に雄ネジ部54nが形成されている。
次に、封鎖弁40の基本動作について説明する。封鎖弁40は、ECU19からの出力信号に基づいてステッピングモータ50を開弁方向、あるいは閉弁方向に予め決められたステップ数だけ回転させる。そして、ステッピングモータ50が予め決められたステップ数だけ回転することで、ステッピングモータ50の出力軸54の雄ネジ部54nとバルブガイド60の筒軸部66の雌ネジ部66wとの螺合作用により、バルブガイド60が上下方向に予め決められたストローク量だけ移動するようになる。前記封鎖弁40では、例えば、全開位置においてステップ数が約200Step、ストローク量が約5mmとなるように設定されている。
次に、図5から図7に基づいて、封鎖弁40の開弁開始位置の学習制御について説明する。学習制御は、車両の駐車中にエンジンのイグニッションスイッチがオンしたタイミングで行われる。ここで、図5の上図は、時間を基準(横軸)としてステッピングモータ50のステップ数の変化、即ち、バルブガイド60、及びバルブ体70のストローク量(軸方向の移動量)を表している。このため、以後、ステップ数とストローク量とは同意語として使用する。また、図5の下図は、時間を基準(横軸)として燃料タンク15の内圧(タンク内圧)の変化を表している。ここで、タンク内圧は、一定周期(ΔTs)毎に検出される。
本実施形態に係る蒸発燃料処理装置20によると、封鎖弁40の開弁開始位置の学習では、ステッピングモータ50をAStep(例えば、4Step)だけ開弁方向に回転させて一定時間T1(例えば、500msec)維持し、さらに、ステッピングモータ50をBStep(例えば、2Step)だけ閉弁方向に回転させて一定時間T2(例えば、1sec)維持する工程を繰り返し、段階的にバルブガイド60、バルブ体70(弁可動部)のストローク量を開弁方向に変化させる。即ち、封鎖弁40の開弁開始位置では、流路が多めに開かれた状態から閉方向に戻されるようになるため、燃料タンク15内の内圧変化の応答性が良くなり、実際の開弁開始時と開弁開始判定時(燃料タンク15の内圧低下検出タイミング)との時間ずれが小さくなり、学習精度を向上させることができる。
本発明は上記した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における変更が可能である。例えば、本実施形態では、燃料タンク15の内圧(タンク内圧)を学習周期に合わせて一定周期(ΔTs)毎に検出する例を示したが、タンク内圧を常時検出することも可能である。これにより、例えば、図8のタンク内圧のグラフに示すように、タンク内圧が所定値(ΔP1)以上低下したことを検出した時点で(タイミングTsx 参照)、学習周期に係わりなく、学習フラグをオンし、学習値Sx(=S4+A-B-1)を更新することができる。さらに、学習値を更新したら、封鎖弁40のステッピングモータ50をXStepだけ閉弁方向に回転させてバルブガイド60、バルブ体70を閉弁位置まで戻すのが好ましい。これにより、燃料タンク15の内圧が高い場合でも、燃料タンク15内の気体が多量にキャニスタ22側に流入するのを防止できるようになる。
また、本実施形態では、燃料タンク15の内圧(タンク内圧)が前回の検出値に対して所定値(ΔP1)以上低下して始めて、封鎖弁40の開弁が開始されたと判定された。しかし、タンク内圧が低い場合、封鎖弁40の開弁が開始されても、タンク内圧が所定値(ΔP1)以上低下しない場合が考えられる。このような場合でも、正確に学習制御が行なわれるようにするため、図9に示すように、仮学習フラグをオンさせることで、ストローク量の更新を保留することが行なわれる。
タンク内圧が低い場合、封鎖弁40の開弁が開始されてもタンク内圧が緩やかに低下して所定値(ΔP1)以上低下するまでに時間が掛かる場合が考えられる。このような場合でも、正確に学習制御が行なわれるようにするため、図14に示すように、仮学習フラグがオンしてからタンク内圧の低下状況を監視し、タンク内圧の低下量積算値が所定値(ΔP1)以上となったときに学習フラグをオンすることが行われる。
本実施形態では、ステッピングモータ50をAStep(例えば、4Step)だけ開弁方向に回転して一定時間T1(例えば、500msec)維持し、ステッピングモータ50をBStep(例えば、-2Step)だけ閉弁方向に回転し、一定時間T2(例えば、1sec)維持し、一定時間T2維持されている間の所定タイミングでタンク内圧を検出する例を示した。しかし、ステッピングモータ50を開弁方向に回転する値(AStep)と閉弁方向に回転する値(BStep)とを適宜変更することは可能である。また、開弁方向に回転したときの一定時間T1、及び閉弁方向に回転したときの一定時間T2も適宜変更可能である。また、本実施形態では、封鎖弁40のモータにステッピングモータ50を使用する例を示したが、ステッピングモータ50の代わりにDCモータ等を使用することも可能である。
以下、図5、及び図15から図19に基づいて本発明の実施形態2に係る蒸発燃料処理装置20の説明を行なう。本実施形態に係る蒸発燃料処理装置20では、学習制御において封鎖弁40のストローク量を変化させる制御(以下、ストローク制御という)と、燃料タンク15の内圧が所定値(ΔP1)以上低下したことを検出する制御(以下、内圧検知制御という)とを独立して行なえるように構成されている。なお、本実施形態に係る蒸発燃料処理装置20の他の構成については、実施形態1に係る蒸発燃料処理装置20と同じであるため、同一符号を付して説明を省略する。
次に、図18、図19に基づいて実施形態2に係る蒸発燃料装置20の変形例について説明する。変形例に係る蒸発燃料装置20では、封鎖弁40のストローク制御のフローチャート(図15)を改良したものであり、図16に示す内圧検知制御のフローチャートは変更がない。
Claims (7)
- 燃料タンク内で発生した蒸発燃料を吸着する吸着材を備えるキャニスタと、前記キャニスタと前記燃料タンクとをつなぐベーパ通路に設けられている封鎖弁とを備える蒸発燃料処理装置であって、
前記封鎖弁は、弁座に対する弁可動部の軸方向距離であるストローク量が零から所定範囲内にあるときが閉弁状態で前記燃料タンクを密閉状態に保持可能であり、前記ストローク量を開弁方向に変化させて前記燃料タンクの内圧が所定値以上低下したときの前記ストローク量に基づいて開弁開始位置を学習できるように構成されており、
前記封鎖弁の開弁開始位置の学習では、第1所定ストロークだけ開弁方向に変化させて第1の時間維持し、次に第1所定ストロークよりも小さい第2所定ストロークだけ閉弁方向に変化させて第1の時間より長い第2の時間維持する工程を繰り返すことで前記ストローク量を開弁方向に変化させ、前記燃料タンクの内圧が所定値以上低下したときの工程、あるいはその前工程の第2の時間維持状態における前記ストローク量に基づいて開弁開始位置が決められる蒸発燃料処理装置。 - 請求項1に記載された蒸発燃料処理装置であって、
前記封鎖弁の開弁開始位置の学習では、前記燃料タンクの内圧が所定値以上低下したことが検出されたタイミングで、前記弁可動部のストローク量を閉弁位置まで変化させる蒸発燃料処理装置。 - 請求項1又は請求項2のいずれかに記載された蒸発燃料処理装置であって、
前記燃料タンクの内圧の検出周期は、前記第1の時間よりも短い時間である蒸発燃料処理装置。 - 請求項1から請求項3のいずれかに記載された蒸発燃料処理装置であって、
前記封鎖弁の開弁開始位置の学習では、前記封鎖弁のストローク量を変化させる制御と、前記燃料タンクの内圧が所定値以上低下したことを検出する制御とが独立して行なわれる蒸発燃料処理装置。 - 請求項4に記載された蒸発燃料処理装置であって、
前記燃料タンクの内圧が所定値以上低下したことを検出する制御の制御周期が前記封鎖弁のストローク量を変化させる制御の制御周期よりも小さな値に設定されている蒸発燃料処理装置。 - 請求項1から請求項5のいずれかに記載された蒸発燃料処理装置であって、
前記燃料タンクの内圧が所定値よりも小さい値だけ低下したことを検出したときに仮学習フラグをオンさせ、前記燃料タンクの内圧が継続して低下している状態で、後工程において前記燃料タンクの内圧が所定値以上低下したときは、前記仮学習フラグがオンしたときの工程、あるいはその前工程の第2の時間維持状態における前記ストローク量に基づいて開弁開始位置が決められる蒸発燃料処理装置。 - 請求項1から請求項6のいずれかに記載された蒸発燃料処理装置であって、
前記燃料タンクの内圧が所定値以上低下したときの工程、あるいは前記仮学習フラグがオンしたときの工程における第2の時間維持状態の前記ストローク量に基づいて開弁開始位置を決める際には、前記ストローク量から第1所定ストロークと第2所定ストロークとの差に基づく値を減算し、
前記燃料タンクの内圧が所定値以上低下したときの直前の工程、あるいは前記仮学習フラグがオンしたときの直前の工程における第2の時間維持状態の前記ストローク量に基づいて開弁開始位置を決める際には、前記ストローク量に第1所定ストロークと第2所定ストロークとの差に基づく値を加算する蒸発燃料処理装置。
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US15/038,898 US9816450B2 (en) | 2013-11-25 | 2014-10-03 | Fuel vapor processing apparatus |
KR1020167010335A KR101852278B1 (ko) | 2013-11-25 | 2014-10-03 | 증발 연료 처리 장치 |
DE112014005351.1T DE112014005351B4 (de) | 2013-11-25 | 2014-10-03 | Kraftstoffdampf-Bearbeitungsvorrichtung |
CN201480063105.XA CN105765207B (zh) | 2013-11-25 | 2014-10-03 | 蒸发燃料处理装置 |
JP2015549030A JP6203863B2 (ja) | 2013-11-25 | 2014-10-03 | 蒸発燃料処理装置 |
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JP (1) | JP6203863B2 (ja) |
KR (1) | KR101852278B1 (ja) |
CN (1) | CN105765207B (ja) |
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JP2018193888A (ja) * | 2017-05-15 | 2018-12-06 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
US10233851B2 (en) | 2016-12-21 | 2019-03-19 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing apparatus |
US10556503B2 (en) | 2017-03-14 | 2020-02-11 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel treatment device |
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US11698045B2 (en) | 2014-09-24 | 2023-07-11 | Eaton Intelligent Power Limited | Electrically controlled fuel system module |
KR20170058963A (ko) | 2014-09-24 | 2017-05-29 | 이턴 코포레이션 | 전기 제어식 연료 시스템 모듈 |
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KR20220017239A (ko) * | 2020-08-04 | 2022-02-11 | 현대자동차주식회사 | 자동차용 연료탱크 밀폐밸브 |
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Also Published As
Publication number | Publication date |
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DE112014005351B4 (de) | 2018-03-08 |
KR101852278B1 (ko) | 2018-04-25 |
JP6203863B2 (ja) | 2017-09-27 |
JPWO2015076027A1 (ja) | 2017-03-16 |
US9816450B2 (en) | 2017-11-14 |
DE112014005351T5 (de) | 2016-08-04 |
US20160356227A1 (en) | 2016-12-08 |
CN105765207B (zh) | 2018-04-03 |
CN105765207A (zh) | 2016-07-13 |
KR20160058906A (ko) | 2016-05-25 |
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