WO2016035656A1 - 蒸発燃料処理装置 - Google Patents
蒸発燃料処理装置 Download PDFInfo
- Publication number
- WO2016035656A1 WO2016035656A1 PCT/JP2015/074147 JP2015074147W WO2016035656A1 WO 2016035656 A1 WO2016035656 A1 WO 2016035656A1 JP 2015074147 W JP2015074147 W JP 2015074147W WO 2016035656 A1 WO2016035656 A1 WO 2016035656A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- internal pressure
- start position
- valve opening
- fuel tank
- Prior art date
Links
Images
Classifications
-
- 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
-
- 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
- B60K15/03519—Valve arrangements in the vent line
-
- 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
- F02M25/0854—Details of the absorption canister
-
- 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
-
- 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
- B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
-
- 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
- B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
- B60K2015/03296—Pressure regulating valves
-
- 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
- B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
- B60K2015/03302—Electromagnetic valves
-
- 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
- B60K2015/03514—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems with vapor recovery means
Definitions
- the valve on the path connecting the fuel tank and the canister is maintained in a closed state when the stroke amount, which is the axial movement distance of the valve movable portion with respect to the valve seat, is within a predetermined amount from the initial state.
- the present invention relates to an evaporated fuel processing apparatus using a flow rate control valve capable of holding a tank in a sealed state.
- Japanese Patent Application Laid-Open No. 2011-256778 discloses an evaporated fuel processing apparatus using the flow rate control valve as a valve on a path connecting a fuel tank and a canister.
- the flow rate control valve needs to operate the valve movable portion in a predetermined amount of valve opening direction after reaching the valve opening start position where the fuel tank and the canister communicate with each other after starting the valve opening operation from the initial state. Therefore, in order to quickly perform the valve opening control of the flow rate control valve, the valve opening start position is learned in advance, and the normal valve opening control is started from the valve opening start position. For such learning, it is necessary to detect the valve opening start position, and the detection is performed by detecting a decrease in the internal pressure of the fuel tank.
- the internal pressure of the fuel tank fluctuates depending on the environment where the fuel tank is placed, and it may be erroneously detected if the valve opening start position is detected due to a decrease in internal pressure. For example, when a large amount of vapor is generated in the space in the fuel tank, the internal pressure may increase due to the vapor, and the internal pressure may not decrease at the valve opening start position.
- an object of the present invention is to use the flow control valve as a valve on a path connecting a canister and a fuel tank in an evaporative fuel processing apparatus.
- a valve for adsorbing the evaporated fuel in the fuel tank to the canister, sucking the adsorbed evaporated fuel into the engine, and communicating the fuel tank and the canister In an evaporative fuel processing apparatus using a flow control valve that is maintained in a closed state when a stroke amount, which is an axial movement distance, is within a predetermined amount from an initial state, the fuel tank uses a flow control valve capable of holding the fuel tank in a sealed state.
- a second-order differential value of the internal pressure detected by the internal pressure sensor is obtained, and when the second-order differential value is equal to or greater than a predetermined value, the flow control valve
- the valve opening start position detecting means for detecting the valve opening position as the valve opening start position, and the valve opening start position detected by the valve opening start position detecting means is used to control the opening degree of the flow control valve.
- a learning means for storing a learned value when performing.
- the valve opening position of the flow control valve is detected as the valve opening start position. Therefore, the valve opening start position can be accurately detected even when the internal pressure of the fuel tank fluctuates due to an increase in evaporated fuel or a change in temperature.
- an evaporative fuel in a fuel tank is adsorbed by a canister, the adsorbed evaporative fuel is sucked into an engine, and a valve movable portion for a valve seat is used as a valve for communicating the fuel tank and the canister.
- a flow control valve that is maintained in a closed state when a stroke amount, which is an axial movement distance, is within a predetermined amount from an initial state
- the fuel tank uses a flow control valve capable of holding the fuel tank in a sealed state.
- An internal pressure sensor for detecting the pressure as an internal pressure, a first internal pressure change amount calculating means for obtaining a change amount per unit time of the internal pressure detected by the internal pressure sensor in a state where the flow control valve is closed, A second internal pressure change amount calculating means for obtaining a change amount per unit time of the internal pressure detected by the internal pressure sensor after the valve opening operation of the flow control valve is started; A valve opening start position detecting means for detecting the valve opening position of the flow control valve as the valve opening start position when the difference between the respective change amounts respectively obtained by the internal pressure change amount calculating means and the second internal pressure change amount calculating means is a predetermined value or more. And a learning means for storing the valve opening start position detected by the valve opening start position detecting means as a learning value when performing the opening degree control of the flow control valve.
- the change amount per unit time of the fuel tank internal pressure in a state where the flow control valve is closed and the change amount per unit time of the fuel tank internal pressure after the start of the valve opening operation of the flow control valve.
- the difference between the two is greater than a predetermined value
- the valve opening position of the flow control valve is detected as the valve opening start position. Therefore, the valve opening start position can be accurately detected even when the internal pressure of the fuel tank fluctuates due to an increase in evaporated fuel or a change in temperature.
- a valve for adsorbing the evaporated fuel in the fuel tank to the canister, sucking the adsorbed evaporated fuel into the engine, and communicating the fuel tank and the canister In an evaporative fuel processing apparatus using a flow control valve that is maintained in a closed state when a stroke amount, which is an axial movement distance, is within a predetermined amount from an initial state, the fuel tank uses a flow control valve capable of holding the fuel tank in a sealed state.
- An internal pressure sensor for detecting the pressure as an internal pressure
- a third internal pressure change amount calculating means for obtaining a change amount per unit time of the internal pressure detected by the internal pressure sensor; and a change amount obtained by the third internal pressure change amount calculating means.
- a valve opening start position detecting means for detecting the valve opening position of the flow rate control valve as the valve opening start position when the difference between the previous value and the current value is equal to or greater than a predetermined value; The detected open-starting position by the start position detection means, and a learning means for storing a learned value when performing opening control of the flow control valve.
- the valve opening position of the flow control valve is detected as the valve opening start position. Therefore, the valve opening start position can be accurately detected even when the internal pressure of the fuel tank fluctuates due to an increase in evaporated fuel or a change in temperature.
- the valve opening start position detecting unit is configured to detect the second internal pressure when the amount of change obtained by the first internal pressure change amount calculating unit is a pressure increase.
- the change amount obtained by the change amount calculating means is smaller than the change amount obtained by the first internal pressure change amount calculating means by a predetermined value or more, or the change amount obtained by the third internal pressure change amount calculating means. If the current value of the amount of change obtained by the third internal pressure change amount calculating means is smaller than the previous value by a predetermined value or more, the valve opening position of the flow control valve is set to the valve opening start position. Detect as.
- the valve opening start position detecting means is configured to detect the second internal pressure when the change amount obtained by the first internal pressure change amount calculating means is a pressure drop.
- the change amount obtained by the change amount calculating means is larger than the change amount obtained by the first internal pressure change amount calculating means by a predetermined value or more, or the change amount obtained by the third internal pressure change amount calculating means.
- the valve opening position of the flow control valve is set to the valve opening start position. Detect as.
- the valve opening start position detecting means determines whether or not the amount of change obtained by the first internal pressure change amount calculating means is that the internal pressure of the fuel tank is in a stable state.
- the valve opening start position is detected based on whether or not the amount of change per unit time of the internal pressure detected by the internal pressure sensor is equal to or greater than a predetermined value when it is determined to be smaller than a reference value for determining To do.
- the evaporated fuel is supplied to the engine.
- the air-fuel ratio of the engine changes instantaneously under the influence of the evaporated fuel.
- the valve opening start position of the flow control valve can be detected.
- the valve opening start position of the flow control valve is detected based on the change in the internal pressure of the fuel tank detected by the internal pressure sensor.
- the valve start position can also be detected.
- a change in the air-fuel ratio feedback correction amount used in the air-fuel ratio control of the engine can be detected, and the valve opening start position can be detected by using this detection result together.
- FIGS. 1 to 3 are conceptual diagrams corresponding to the first to third inventions of the present invention, and description thereof will be omitted because they are repeated.
- FIG. 4 to 8 show a first embodiment of the present invention.
- an evaporated fuel processing device 20 is added to the engine system 10 of the vehicle.
- the engine system 10 is a well-known system, and supplies an air-fuel mixture in which fuel is mixed with air through an intake passage 12 to an engine body 11.
- Air is supplied with its flow rate controlled by a throttle valve 14, and fuel is supplied with its flow rate controlled by a fuel injection valve (not shown).
- Both the throttle valve 14 and the fuel injection valve are connected to a control circuit (ECU) 16.
- the throttle valve 14 supplies the control circuit 16 with a signal related to the amount of opening of the throttle valve 14, and the fuel injection valve is controlled by the control circuit 16.
- the valve opening time is controlled.
- Fuel is supplied to the fuel injection valve, and the fuel is supplied from the fuel tank 15.
- the evaporated fuel processing device 20 adsorbs fuel vapor generated during refueling or fuel vapor evaporated in the fuel tank 15 (hereinafter referred to as evaporated fuel) to the canister 21 via the vapor passage 22.
- the evaporated fuel adsorbed by the canister 21 is supplied to the intake passage 12 on the downstream side of the throttle valve 14 via the purge passage 23.
- the vapor passage 22 is provided with a step motor type blocking valve (corresponding to a flow control valve in the present invention, hereinafter simply referred to as a blocking valve) 24 so as to open and close the passage 22.
- a purge valve 25 is provided so as to open and close the purge passage 23.
- the block valve 24 is maintained in the closed state when the stroke amount, which is the axial movement distance of the valve movable portion with respect to the valve seat, is within a predetermined amount from the initial state, and the fuel tank 15 is sealed. Can be retained.
- the stroke amount can be continuously changed.
- the blocking valve 24 is opened, and the fuel tank 15 and the canister 21 are communicated.
- the position of the valve body in which the stroke amount exceeds a predetermined amount corresponds to the valve opening start position in the present invention.
- activated carbon 21a as an adsorbent is loaded, and the evaporated fuel from the vapor passage 22 is adsorbed by the activated carbon 21a, and the adsorbed evaporated fuel is discharged to the purge passage 23.
- An atmospheric passage 28 is also connected to the canister 21, and when an intake negative pressure is applied to the canister 21 via the purge passage 23, atmospheric pressure is supplied through the atmospheric passage 28, and the evaporated fuel passes through the purge passage 23. Purge is performed.
- the air passage 28 sucks air from the vicinity of the fuel filler port 17 provided in the fuel tank 15.
- the control circuit 16 receives various signals necessary for controlling the valve opening time of the fuel injection valve.
- the one shown in FIG. 4 is a pressure sensor (corresponding to the internal pressure sensor of the present invention, hereinafter referred to as an internal pressure sensor) 26 for detecting the internal pressure of the fuel tank 15.
- the detection signal is input to the control circuit 16.
- the control circuit 16 controls the opening of the closing valve 24 and the purge valve 25 in the case shown in FIG. 4 in addition to the control of the opening time of the fuel injection valve as described above.
- FIG. 5 shows the structure of the blocking valve 24.
- the blocking valve 24 includes a generally cylindrical valve guide 60 disposed concentrically in a cylindrical valve chamber 32 of the valve casing 30, and a generally cylindrical valve disposed concentrically within the valve guide 60.
- a body 70 is provided.
- an inflow passage 34 communicating with the vapor passage 22 on the fuel tank 15 side is formed in the center of the lower end portion of the valve chamber 32 of the valve casing 30.
- an outflow passage 36 communicating with the vapor passage 22 on the canister 21 side is formed on the side wall of the valve chamber 32 of the valve casing 30.
- a motor main body 52 of the staple motor 50 is provided at the upper end portion of the valve casing 30 opposite to the lower end portion where the inflow passage 34 is formed, and the upper end portion of the valve chamber 32 is sealed.
- the valve guide 60 and the valve body 70 constitute a valve movable portion in the present invention, and a circular valve seat 40 is formed concentrically at the opening edge of the lower end portion of the valve casing 30 in which the inflow passage 34 is formed. Has been. Then, when the valve guide 60 and the valve body 70 are brought into contact with the valve seat 40, the closing valve 24 is closed, and when the valve guide 60 and the valve body 70 are separated from the valve seat 40, the closing valve 24 is opened. It is in a valve state.
- the valve guide 60 is formed in a cylindrical cylindrical shape by 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 tube shaft portion 66 is formed concentrically at the center portion of the upper wall portion 64, and a female screw portion 66 w is formed on the inner peripheral surface of the tube shaft portion 66.
- a male screw portion 54 n formed on the outer peripheral surface of the output shaft 54 of the step motor 50 is screwed into the female screw portion 66 w of the tube shaft portion 66 of the valve guide 60.
- the valve guide 60 is disposed so as to be movable in the axial direction (vertical direction) with respect to the valve casing 30 in a state in which the valve guide 30 is prevented from rotating in the direction around the axis by a rotation preventing means (not shown). Therefore, the valve guide 60 is configured to be movable up and down in the vertical direction (axial direction) based on forward and reverse rotation of the output shaft 54 of the step motor 50. Further, around the valve guide 60, an auxiliary spring 68 that biases the valve guide 60 upward is interposed.
- the valve body 70 is formed in a bottomed cylindrical shape 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 seal member 76 of the valve body 70 is disposed so as to be able to contact the upper surface of the valve seat 40 of the valve casing 30.
- a plurality of connecting convex portions 72t are formed in the circumferential direction on the outer peripheral surface of the upper end of the cylindrical wall portion 72 of the valve body 70.
- a connecting recess 62m having a longitudinal groove shape is formed along the moving direction of the valve guide 60 corresponding to each connecting protrusion 72t of the valve body 70. Yes. Therefore, each connection convex part 72t of the valve body 70 is fitted in a state in which it can be relatively moved in the vertical direction within each connection concave part 62m of the valve guide 60.
- 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.
- a valve spring 77 that constantly biases the valve body 70 downward, that is, in the valve closing direction, between the upper wall portion 64 of the valve guide 60 and the lower wall portion 74 of the valve body 70. are concentrically arranged.
- the closing valve 24 is operated by rotating the step motor 50 by a predetermined number of steps in the valve opening direction or the valve closing direction based on an output signal from the control circuit (ECU) 16. That is, when the step motor 50 rotates by a predetermined number of steps, the male screw portion 54n of the output shaft 54 of the step motor 50 and the female screw portion 66w of the cylindrical 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.
- the blocking valve 24 is set so that the number of steps from the initial state is about 200 Step and the stroke amount is about 5 mm in the fully opened position.
- the valve guide 60 In the initialized state (initial state) of the blocking valve 24, as shown in FIG. 5, 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 40 of the valve casing 42. It is in contact with the upper surface of. Further, in this state, the connecting convex portion 72t of the valve body 70 is located above the bottom wall portion 62b of the valve guide 60, and the seal member 76 of the valve body 70 is caused by the spring force of the valve spring 77. It is pressed against the upper surface of the valve seat 40 of the valve casing 42. That is, the blocking valve 24 is held in a fully closed state.
- the number of steps of the step motor 50 at this time is 0 Step, and the movement amount of the valve guide 60 in the axial direction (upward), that is, the stroke amount in the valve opening direction is 0 mm.
- the step motor 50 of the block valve 24 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 step 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 40 is kept floating. Thereby, an unreasonable force is suppressed from being applied between the valve guide 60 of the blocking valve 24 and the valve seat 40 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 40 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 60 abuts on the connecting convex portion 72t of the valve body 70 from below.
- the valve guide 60 moves further upward, the valve body 70 moves upward together with the valve guide 60 as shown in FIG. 7, and the seal member 76 of the valve body 70 moves from the valve seat 40 of the valve casing 42. Get away. As a result, the blocking valve 24 is opened.
- valve opening start position of the sealing valve 24 differs depending on the sealing valve 24 due to the positional tolerance of the connecting convex portion 72t formed in the valve body 70, the positional tolerance of the bottom wall portion 62b of the valve guide 60, etc. 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 step motor 50 of the block valve 24 in the valve opening direction (increasing the number of steps). The number of position steps is detected and stored.
- step S1 it is determined in step S1 whether or not a learning execution flag is set.
- the learning execution flag is set when the learning routine is in a state suitable for executing the learning control of the valve opening start position of the stepping motor type blocking valve 24 by a processing routine (not shown). For example, an ignition switch (not shown) that is a power switch of the vehicle is turned on and the vehicle is set in a stopped state.
- a processing routine not shown. For example, an ignition switch (not shown) that is a power switch of the vehicle is turned on and the vehicle is set in a stopped state.
- step S2 the fuel tank internal pressure (hereinafter also simply referred to as tank pressure) P1 at that time is measured and taken in by the internal pressure sensor 26.
- step S3 it is determined whether or not the time measurement counter has reached the first predetermined value.
- step S4 the tank pressure P2 at that time is measured and taken in by the internal pressure sensor 26 in step S4 as in step S2. It is.
- step S5 the differential pressure Vp1 between the tank pressures P1 and P2 taken in as described above is calculated.
- the differential pressure Vp1 obtained here corresponds to the amount of change per unit time of the tank pressure detected by the internal pressure sensor 26 in a state where the blocking valve 24 is closed.
- step S6 it is determined whether or not the absolute value of the differential pressure Vp1 obtained in step S5 is equal to or greater than a second predetermined value.
- the second predetermined value is a reference value for determining whether or not the tank pressure is in a stable state.
- step S6 When the absolute value of the differential pressure Vp1 is smaller than the second predetermined value as shown in FIG. 9, a negative determination is made in step S6, and the tank pressure is in a stable state, and normal learning control is performed in step S20.
- step S ⁇ b> 20 when the amount of decrease in the tank pressure from the previous time becomes equal to or greater than a predetermined value, it is detected that the closing valve 24 is at the valve opening start position, Is stored as a learning value.
- step S6 the blocking valve 24 is opened stepwise by a predetermined amount as shown in FIG. 10 by the step motor.
- step S8 the tank pressure Pn at that time is measured and taken in by the internal pressure sensor 26 as in step S2.
- step S9 it is determined whether or not the time measurement counter has reached the third predetermined value.
- step S10 the tank pressure Pn + 1 at that time is measured and taken in by the internal pressure sensor 26 as in step S2. It is.
- step S11 the differential pressure Vp between the tank pressures Pn and Pn + 1 taken in as described above is calculated.
- the differential pressure Vp obtained here corresponds to a change amount per unit time of the tank pressure detected by the internal pressure sensor 26 after the closing valve 24 starts the valve opening operation.
- step S12 it is determined whether or not the absolute value of the change width between the differential pressure Vp1 obtained in step S5 and the differential pressure Vp obtained in step S11 is equal to or greater than a fourth predetermined value.
- the fourth predetermined value is that the internal pressure of the fuel tank decreases when the fuel tank 15 and the canister 21 are communicated with each other and the fuel vapor 15 starts to flow from the fuel tank 15 to the canister 21.
- the corresponding pressure change range is set. As shown in FIG. 10, at the timing when the tank internal pressure is Pn + 1, Pn + 2, the change width of the differential pressure Vp with respect to the differential pressure Vp1 is substantially zero and does not exceed the fourth predetermined value. Therefore, a negative determination is made in step S12, and after step S7 The process is repeated.
- step S12 the absolute value of the change width of the differential pressure Vp with respect to the differential pressure Vp1 is equal to or greater than a fourth predetermined value (the change amount Vp of the tank pressure per unit time is smaller than the Vp1 by a fourth predetermined value or less). Therefore, affirmative determination is made in step S12, and in step S13, the valve opening position of the blocking valve 24 at that time is stored as the valve opening start position.
- the sealing valve 24 is opened stepwise at the timing of Pn + 2
- the sealing member 76 of the valve body 70 in the sealing valve 24 is separated from the valve seat 40 of the valve casing 30, and the sealing valve 24 is opened.
- the fuel tank 15 and the canister 21 are communicated with each other.
- step S5 the learning completion flag is set and then the learning execution flag is set in step S14. Not executed.
- step S5 the process of step S5, step S11, and step S12 is equivalent to calculating
- step S12 corresponds to the predetermined value in the present invention.
- the learning control of the valve opening start position of the block valve 24 is performed, and when the valve opening control is performed thereafter, the valve 24 is immediately opened from the valve opening start position stored as the learned value.
- the valve can be started. Further, when learning the valve opening start position, the fuel tank internal pressure that accompanies the start of the flow of the evaporated fuel from the fuel tank 15 to the canister 21 in consideration of the change in the fuel tank internal pressure when the closing valve 24 is closed for learning. Therefore, the valve opening start position can be accurately detected regardless of the environmental change in which the fuel tank 15 is placed.
- FIG. 12 shows a second embodiment of the present invention.
- the feature of the second embodiment over the first embodiment resides in how to detect a change in tank pressure that occurs when the blocking valve 24 reaches the valve opening start position. That is, in the first embodiment, the amount of change in the tank pressure per unit time after the start of the opening operation of the block valve 24 on the basis of the amount of change in the tank pressure per unit time in the state where the block valve 24 is closed. Were compared to detect the valve opening start position. On the other hand, in the second embodiment, the amount of change in tank pressure per unit time is detected at regular intervals, and the current value is compared with the previous value of the detected amount of change per unit time as a reference. The valve start position is detected. Specifically, FIG. 12 is different from FIG. 11 showing the first embodiment in that step S15 is included. Other configurations are exactly the same, and the repetitive description of the same parts is omitted.
- step S15 of FIG. 12 the differential pressure Vp obtained in step S11 is replaced with the differential pressure Vp1 that is the reference value in step S12. Therefore, in the next time, when the change width between the differential pressure Vp1 and the differential pressure Vp is obtained in step S12 and compared with the fourth predetermined value, the absolute change width between the differential pressure Vp obtained this time and the previously obtained differential pressure Vp is absolute. It is determined whether or not the value is greater than or equal to a fourth predetermined value.
- valve opening start position of the blocking valve 24 is detected based on the change width between the differential pressure Vp obtained this time and the differential pressure Vp obtained last time, a change in temperature, etc. Even when the tank pressure gradually changes due to the external factor, it is possible to detect the valve opening start position without being affected by this.
- steps S2 to S6 and step S20 may be omitted.
- the processing program for detecting the valve opening start position of the blocking valve 24 can be shortened to shorten the processing time.
- steps S2 to S5 and steps S8 to S12 in the above embodiments correspond to the valve opening start position detecting means in the first invention.
- the processing of step S2 to step S5 corresponds to the first internal pressure change amount calculating means in the present invention.
- the processing from step S8 to step S11 corresponds to the second internal pressure change amount calculating means in the present invention.
- the processes in steps S8 to S11 and step S15 correspond to the third internal pressure change amount calculating means in the present invention.
- the process of step S12 corresponds to the valve opening start position detecting means in the second and third inventions.
- the process of step S13 corresponds to the learning means in the present invention.
- the processing of step S6 and step S20 corresponds to the valve opening start position detecting means in the sixth aspect of the invention.
- the flow control valve is the step motor type block valve 24, but it may be a ball valve having a structure in which the valve opening amount is continuously changed by the rotation of the ball-shaped valve element.
- this invention was applied to the engine system for vehicles, this invention is not limited to vehicles. In the case of an engine system for a vehicle, a hybrid vehicle using both an engine and a motor may be used.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
Description
Claims (6)
- 燃料タンク内の蒸発燃料をキャニスタに吸着させ、その吸着された蒸発燃料をエンジンに吸入させ、燃料タンクとキャニスタとを連通させる弁として、弁座に対する弁可動部の軸方向移動距離であるストローク量が初期状態から所定量以内では閉弁状態に維持され、前記燃料タンクを密閉状態に保持可能な流量制御弁を用いた蒸発燃料処理装置において、
燃料タンク内の空間圧力を内圧として検出する内圧センサと、
前記流量制御弁の開弁動作開始後、内圧センサによって検出される内圧の二階微分値を求め、この二階微分値が所定値以上のとき、流量制御弁の開弁位置を開弁開始位置として検出する開弁開始位置検出手段と、
開弁開始位置検出手段によって検出された開弁開始位置を、流量制御弁の開度制御を行う際の学習値として記憶する学習手段とを備える蒸発燃料処理装置。 - 燃料タンク内の蒸発燃料をキャニスタに吸着させ、その吸着された蒸発燃料をエンジンに吸入させ、燃料タンクとキャニスタとを連通させる弁として、弁座に対する弁可動部の軸方向移動距離であるストローク量が初期状態から所定量以内では閉弁状態に維持され、前記燃料タンクを密閉状態に保持可能な流量制御弁を用いた蒸発燃料処理装置において、
燃料タンク内の空間圧力を内圧として検出する内圧センサと、
前記流量制御弁が閉弁されている状態で、前記内圧センサによって検出される内圧の単位時間当たりの変化量を求める第1内圧変化量算出手段と、
前記流量制御弁の開弁動作開始後、前記内圧センサによって検出される内圧の単位時間当たりの変化量を求める第2内圧変化量算出手段と、
前記第1内圧変化量算出手段と第2内圧変化量算出手段によってそれぞれ求められる各変化量の差が所定値以上のとき、流量制御弁の開弁位置を開弁開始位置として検出する開弁開始位置検出手段と、
該開弁開始位置検出手段によって検出された開弁開始位置を、前記流量制御弁の開度制御を行う際の学習値として記憶する学習手段とを備える蒸発燃料処理装置。 - 燃料タンク内の蒸発燃料をキャニスタに吸着させ、その吸着された蒸発燃料をエンジンに吸入させ、燃料タンクとキャニスタとを連通させる弁として、弁座に対する弁可動部の軸方向移動距離であるストローク量が初期状態から所定量以内では閉弁状態に維持され、前記燃料タンクを密閉状態に保持可能な流量制御弁を用いた蒸発燃料処理装置において、
燃料タンク内の空間圧力を内圧として検出する内圧センサと、
前記内圧センサによって検出される内圧の単位時間当たりの変化量を求める第3内圧変化量算出手段と、
前記第3内圧変化量算出手段によって求められた変化量の前回値と今回値との差が所定値以上のとき、流量制御弁の開弁位置を開弁開始位置として検出する開弁開始位置検出手段と、
該開弁開始位置検出手段によって検出された開弁開始位置を、流量制御弁の開度制御を行う際の学習値として記憶する学習手段とを備える蒸発燃料処理装置。 - 請求項2又は3において、
前記開弁開始位置検出手段は、前記第1内圧変化算出手段によって求められた変化量が圧力増加の場合、前記第2内圧変化算出手段によって求められた変化量が前記第1内圧変化算出手段によって求められた変化量に比べて所定値以上小さいとき、
若しくは、前記第3内圧変化算出手段によって求められた変化量の前回値が圧力増加の場合、前記第3内圧変化算出手段によって求められた変化量の今回値が前回値に比べて所定値以上小さいとき、
流量制御弁の開弁位置を開弁開始位置として検出する蒸発燃料処理装置。 - 請求項2又は3において、
前記開弁開始位置検出手段は、前記第1内圧変化算出手段によって求められた変化量が圧力降下の場合、前記第2内圧変化算出手段によって求められた変化量が前記第1内圧変化算出手段によって求められた変化量に比べて所定値以上大きいとき、
若しくは、前記第3内圧変化算出手段によって求められた変化量の前回値が圧力降下の場合、前記第3内圧変化算出手段によって求められた変化量の今回値が前回値に比べて所定値以上大きいとき、
流量制御弁の開弁位置を開弁開始位置として検出する蒸発燃料処理装置。 - 請求項2において、
前記開弁開始位置検出手段は、前記第1内圧変化量算出手段によって求められる変化量が、燃料タンクの内圧が安定状態にあるか否かを判定するための基準値より小さく安定状態にあると判定されたとき、前記内圧センサによって検出される内圧の単位時間当りの変化量が所定値以上か否かに基づいて開弁開始位置を検出する蒸発燃料処理装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201580045266.0A CN106574577B (zh) | 2014-09-01 | 2015-08-27 | 蒸发燃料处理装置 |
JP2016546595A JP6306195B2 (ja) | 2014-09-01 | 2015-08-27 | 蒸発燃料処理装置 |
DE112015004005.6T DE112015004005B4 (de) | 2014-09-01 | 2015-08-27 | Verarbeitungsvorrichtung für verdampften Kraftstoff |
US15/507,789 US10267267B2 (en) | 2014-09-01 | 2015-08-27 | Evaporated fuel processing device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014176954 | 2014-09-01 | ||
JP2014-176954 | 2014-09-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016035656A1 true WO2016035656A1 (ja) | 2016-03-10 |
Family
ID=55439721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/074147 WO2016035656A1 (ja) | 2014-09-01 | 2015-08-27 | 蒸発燃料処理装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10267267B2 (ja) |
JP (1) | JP6306195B2 (ja) |
CN (1) | CN106574577B (ja) |
DE (1) | DE112015004005B4 (ja) |
WO (1) | WO2016035656A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180171894A1 (en) * | 2016-12-21 | 2018-06-21 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing apparatus |
US10400688B2 (en) | 2016-12-21 | 2019-09-03 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing appartus |
JP2019183677A (ja) * | 2018-04-03 | 2019-10-24 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6591270B2 (ja) * | 2015-11-30 | 2019-10-16 | 愛三工業株式会社 | 圧力調整弁 |
JP2017133411A (ja) * | 2016-01-27 | 2017-08-03 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
JP6753790B2 (ja) * | 2017-01-25 | 2020-09-09 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
CN110621528B (zh) | 2017-06-09 | 2023-07-04 | 全耐塑料高级创新研究公司 | 带有蒸气控制的车辆燃料系统 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006214391A (ja) * | 2005-02-04 | 2006-08-17 | Honda Motor Co Ltd | 蒸発燃料処理装置の故障診断装置 |
JP5167023B2 (ja) * | 2008-08-08 | 2013-03-21 | ヤマハ発動機株式会社 | 舶用推進機 |
JP5400669B2 (ja) * | 2010-03-11 | 2014-01-29 | 本田技研工業株式会社 | 蒸発燃料処理装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05332204A (ja) * | 1992-06-03 | 1993-12-14 | Honda Motor Co Ltd | 内燃エンジンの蒸発燃料制御装置 |
JP2921307B2 (ja) * | 1992-11-25 | 1999-07-19 | 日産自動車株式会社 | 内燃機関の蒸発燃料リーク診断装置 |
DE4342431A1 (de) * | 1993-12-11 | 1995-06-14 | Bosch Gmbh Robert | Verfahren zur Ermittlung von Aussagen über den Zustand einer Tankentlüftungsanlage |
JP3923473B2 (ja) * | 2003-05-21 | 2007-05-30 | 本田技研工業株式会社 | 蒸発燃料処理装置の故障診断装置 |
JP4715767B2 (ja) * | 2007-02-14 | 2011-07-06 | トヨタ自動車株式会社 | 蒸発燃料処理装置及び蒸発燃料処理方法 |
US8640676B2 (en) | 2010-03-11 | 2014-02-04 | Honda Motor Co., Ltd. | Evaporated fuel treatment apparatus |
JP5061221B2 (ja) * | 2010-06-09 | 2012-10-31 | 本田技研工業株式会社 | 蒸発燃料処理装置 |
JP5500182B2 (ja) * | 2012-01-05 | 2014-05-21 | 三菱自動車工業株式会社 | 燃料蒸発ガス排出抑止装置 |
US9261054B2 (en) * | 2012-03-23 | 2016-02-16 | Ford Global Technologies, Llc | Fuel system diagnostics |
JP5936985B2 (ja) | 2012-10-12 | 2016-06-22 | 愛三工業株式会社 | 蒸発燃料処理装置 |
JP5883777B2 (ja) * | 2012-12-27 | 2016-03-15 | 本田技研工業株式会社 | 蒸発燃料処理装置、および、蒸発燃料処理装置の診断方法 |
US9217397B2 (en) * | 2013-09-16 | 2015-12-22 | Ford Global Technologies, Llc | Fuel tank pressure sensor rationality test for a PHEV |
US9803592B2 (en) * | 2015-06-03 | 2017-10-31 | Ford Global Technologies, Llc | Fuel vapor blocking valve control |
-
2015
- 2015-08-27 DE DE112015004005.6T patent/DE112015004005B4/de active Active
- 2015-08-27 US US15/507,789 patent/US10267267B2/en active Active
- 2015-08-27 WO PCT/JP2015/074147 patent/WO2016035656A1/ja active Application Filing
- 2015-08-27 JP JP2016546595A patent/JP6306195B2/ja active Active
- 2015-08-27 CN CN201580045266.0A patent/CN106574577B/zh active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006214391A (ja) * | 2005-02-04 | 2006-08-17 | Honda Motor Co Ltd | 蒸発燃料処理装置の故障診断装置 |
JP5167023B2 (ja) * | 2008-08-08 | 2013-03-21 | ヤマハ発動機株式会社 | 舶用推進機 |
JP5400669B2 (ja) * | 2010-03-11 | 2014-01-29 | 本田技研工業株式会社 | 蒸発燃料処理装置 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180171894A1 (en) * | 2016-12-21 | 2018-06-21 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing apparatus |
US10233851B2 (en) * | 2016-12-21 | 2019-03-19 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing apparatus |
US10400688B2 (en) | 2016-12-21 | 2019-09-03 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing appartus |
USRE48638E1 (en) | 2016-12-21 | 2021-07-13 | Toyota Jidosha Kabushiki Kaisha | Evaporated fuel processing apparatus |
JP2019183677A (ja) * | 2018-04-03 | 2019-10-24 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
JP7028694B2 (ja) | 2018-04-03 | 2022-03-02 | トヨタ自動車株式会社 | 蒸発燃料処理装置 |
Also Published As
Publication number | Publication date |
---|---|
DE112015004005T5 (de) | 2017-05-18 |
US10267267B2 (en) | 2019-04-23 |
DE112015004005B4 (de) | 2020-03-12 |
JP6306195B2 (ja) | 2018-04-04 |
US20170305266A1 (en) | 2017-10-26 |
JPWO2016035656A1 (ja) | 2017-04-27 |
CN106574577A (zh) | 2017-04-19 |
CN106574577B (zh) | 2019-04-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6306195B2 (ja) | 蒸発燃料処理装置 | |
JP6266797B2 (ja) | 蒸発燃料処理装置 | |
JP6306196B2 (ja) | 蒸発燃料処理装置 | |
US9689324B2 (en) | Vaporized fuel processing apparatus | |
US9726120B2 (en) | Vaporized fuel processing apparatus | |
JP6177675B2 (ja) | 蒸発燃料処理装置 | |
US9421490B2 (en) | Fuel vapor processing apparatus | |
US9523316B2 (en) | Vaporized fuel processing apparatus | |
US10012180B2 (en) | Evaporated fuel processing device | |
USRE48638E1 (en) | Evaporated fuel processing apparatus | |
JP6076885B2 (ja) | 蒸発燃料処理装置 | |
JP2016050540A (ja) | 蒸発燃料処理装置 | |
US10018159B2 (en) | Fuel vapor processing apparatus | |
JP6100148B2 (ja) | 蒸発燃料処理装置 | |
US10851722B2 (en) | Evaporated fuel processing apparatus | |
US10233851B2 (en) | Evaporated fuel processing apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15838223 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016546595 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15507789 Country of ref document: US Ref document number: 112015004005 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15838223 Country of ref document: EP Kind code of ref document: A1 |