WO2016035655A1 - 蒸発燃料処理装置 - Google Patents
蒸発燃料処理装置 Download PDFInfo
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- WO2016035655A1 WO2016035655A1 PCT/JP2015/074146 JP2015074146W WO2016035655A1 WO 2016035655 A1 WO2016035655 A1 WO 2016035655A1 JP 2015074146 W JP2015074146 W JP 2015074146W WO 2016035655 A1 WO2016035655 A1 WO 2016035655A1
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- Prior art keywords
- valve
- fuel
- internal pressure
- fuel tank
- opening
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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
- F02M25/089—Layout of the fuel vapour installation
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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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
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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
- B60K15/04—Tank inlets
- B60K15/05—Inlet covers
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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
- B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
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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
- B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
- B60K2015/03289—Float valves; Floats therefor
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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
- B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
- B60K2015/03302—Electromagnetic valves
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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
- 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
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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
- B60K2015/03561—Venting means working at specific times
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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
- B60K2015/03561—Venting means working at specific times
- B60K2015/03576—Venting during filling the reservoir
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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
- B60K2015/0358—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts
Definitions
- the present invention relates to an evaporative fuel processing apparatus provided with a block valve for controlling communication between a fuel tank and a canister on a path connecting the fuel tank and the canister.
- the float valve in the fuel tank closes, causing problems such as the inability to decrease the internal pressure.
- the opening degree of the blocking valve is controlled to be suppressed.
- the problem of the present invention is that when the fuel tank internal pressure is high at the time of fuel refueling, the fuel tank is opened by opening the block valve before opening the fuel cap and allowing the evaporated fuel to flow through the path with the float valve.
- the pressure at which refueling is possible by increasing the opening speed of the block valve in accordance with the decrease in evaporative fuel so as to increase the flow rate of evaporative fuel within the range where the float valve does not operate This is to reduce the time required for the internal pressure of the fuel tank to decrease.
- the evaporated fuel in the fuel tank is adsorbed by the canister, the adsorbed evaporated fuel is sucked into the engine, and the fuel tank and the canister are connected to each other on the path connecting the fuel tank and the canister.
- An evaporative fuel processing apparatus having a sealing valve for controlling communication and having a float valve for preventing fuel from flowing out from the fuel tank onto the path is operated to instruct the start of refueling to the fuel tank.
- a fuel supply switch for generating a fuel supply start signal, an internal pressure sensor for detecting a space pressure in the fuel tank as an internal pressure, a fuel supply start signal from the fuel switch, and an internal pressure of the fuel tank detected by the internal pressure sensor.
- the block valve is opened within a range where the float valve does not operate,
- a closing valve control means for increasing the opening speed of the sealing valve the internal pressure of the charge tank according to decrease.
- the closing valve control means may employ a control for increasing the opening speed of the closing valve stepwise or continuously as the internal pressure of the fuel tank detected by the internal pressure sensor decreases. it can.
- the blocking valve is opened before the fuel supply is started, and the evaporated fuel in the fuel tank is transferred to the canister. To be adsorbed. Accordingly, it is possible to prevent the evaporated fuel in the fuel tank from being discharged into the atmosphere from the fuel filler port during fueling.
- the valve opening control of the block valve is opened within a range where the float valve is not closed, and the valve opening speed is increased as the internal pressure of the fuel tank decreases. Therefore, the evaporated fuel in the fuel tank can be quickly adsorbed to the canister without the float valve being closed, and the time from when the refueling start signal is issued to when refueling becomes possible can be shortened. it can.
- the blocking valve control means performs the opening control of the blocking valve from the start of valve opening in at least two stages, Compared to the first stage, the subsequent second stage has a larger opening and a higher valve opening speed.
- the switching between the first stage and the second stage can be performed when the internal pressure of the fuel tank detected by the internal pressure sensor reaches a predetermined switching pressure.
- the opening control of the block valve in the first stage is not performed, and only the control in the second stage is performed. it can.
- the blocking valve control means controls the opening degree of the blocking valve in accordance with the internal pressure of the fuel tank in the first stage, and is predetermined in the second stage. It is possible to open the block valve stepwise by an amount.
- the blocking valve control means is controlled in accordance with the internal pressure of the fuel tank in which the valve opening speed of the blocking valve is detected by the internal pressure sensor in the first stage. The higher the internal pressure, the slower.
- the opening degree of the blocking valve is increased stepwise in the first and second stages of the blocking valve control means.
- the blocking valve control means is controlled in accordance with an internal pressure of the fuel tank in which the valve opening amount of the blocking valve is detected by the internal pressure sensor in the first stage. The higher the internal pressure, the smaller.
- the blockade valve control means prevents the internal pressure drop of the fuel tank detected by the internal pressure sensor from exceeding a predetermined value in the first stage.
- the opening degree of the block valve is controlled.
- the closing valve control means when the closing valve control means detects a closing operation of the float valve, the opening degree of the blocking valve is decreased by a predetermined amount.
- the detection of the closing operation of the float valve can be performed by detecting that the amount of decrease in the internal pressure of the fuel tank is small while the blocking valve is open. Further, the opening degree of the blocking valve can be reduced by a control for closing the closing valve by a predetermined amount that is predetermined stepwise, or by a control for continuously reducing the opening degree of the closing valve until the float valve is opened again. it can.
- the opening degree of the block valve is once reduced.
- the flow rate of the evaporated fuel flowing from the fuel tank to the canister through the blocking valve is suppressed, and the float valve can be opened again. Therefore, even after the float valve is once closed, the evaporated fuel from the fuel tank can be continuously adsorbed to the canister, and it is possible to prevent refueling from becoming impossible.
- a breather pipe so as to circulate the evaporated fuel generated in the fuel tank during refueling to the fuel inlet portion of the fuel tank, and adsorb the evaporated fuel in the fuel tank to the canister
- a fuel vapor processing apparatus having a sealing valve for controlling communication between the fuel tank and the canister on a path connecting the fuel tank and the canister to the engine to suck in the evaporated fuel, the sealing valve after the start of refueling
- the predetermined opening is such that the internal pressure of the fuel tank is higher than the first pressure required to circulate a required amount of evaporated fuel through the breather pipe to the fuel filler opening of the fuel tank. It is provided with a closing valve control means for achieving an opening degree.
- the predetermined opening at which the blocking valve is controlled can be a predetermined fixed opening. Further, the predetermined opening degree at which the blocking valve is controlled is such that the evaporated fuel accumulated in the fuel tank is opened before the start of refueling, and the evaporative fuel generated in the fuel tank is prepared for completion of refueling after the start of refueling. A predetermined amount can be closed in accordance with the decrease.
- the fuel tank internal pressure during refueling circulates a necessary amount of evaporated fuel to the fuel filler port portion of the fuel tank through the breather pipe by controlling the opening of the seal valve by the seal valve control means.
- the pressure is higher than the required first pressure. Therefore, the amount of evaporated fuel circulated by the breather pipe during refueling can be adjusted to an appropriate amount. That is, without adjusting the flow resistance of the breather pipe, which is highly difficult, the internal pressure of the fuel tank is adjusted by functioning the sealing valve on the path connecting the fuel tank and the canister as a pressure adjusting means. Adjustment can be made so that the amount of fuel vapor circulated does not fluctuate due to the influence of environmental changes such as changes.
- the predetermined opening is an opening at which the internal pressure of the fuel tank becomes lower than the second pressure.
- the second pressure is determined by a fuel gun when the fuel tank is full. Corresponds to the pressure at which the auto-stop function that stops refueling works
- the second pressure may be equal to the pressure at which the auto-stop function works, or may be slightly lower than the pressure at which the auto-stop function works.
- an internal pressure sensor that detects a space pressure in the fuel tank as an internal pressure
- the blocking valve control means opens the opening of the blocking valve after refueling is started. Is controlled based on the internal pressure of the fuel tank detected by the internal pressure sensor.
- the block valve control means opens the block valve when the internal pressure of the fuel tank detected by the internal pressure sensor is lower than a preset first set pressure. Close the first predetermined amount.
- the block valve control means opens the block valve so that the internal pressure of the fuel tank detected by the internal pressure sensor becomes a preset second set pressure. Control the degree.
- the blocking valve control means detects the peak of the internal pressure rising due to the evaporated fuel generated in the fuel tank at the start of refueling, and then Control the opening of the block valve.
- the peak may be detected by detecting that the internal pressure has reached a pressure set slightly lower than a predetermined peak pressure, or that the internal pressure has changed from rising to falling. You may carry out by detecting.
- the block valve control means is configured such that when the internal pressure of the fuel tank detected by the internal pressure sensor reaches the second pressure, the block valve Is opened to a predetermined opening, or is opened by a second predetermined amount.
- the blocking valve when the internal pressure of the fuel tank reaches the second pressure, the blocking valve is opened to a predetermined opening degree or opened by a second predetermined amount.
- the internal pressure of the fuel tank is reduced, and even if the auto-stop function of the fuel gun once works before the fuel tank is full, the auto-stop function can be immediately released and the fuel supply can be continued.
- FIG. 1 is a conceptual diagram corresponding to the first aspect of the present invention, and the description here will be omitted because it will be repeated.
- 2 and 3 show a first embodiment of the present invention. In this embodiment, as shown in FIG. 2, an evaporated fuel processing device 20 is added to the engine system 10 of the vehicle.
- the engine system 10 is a well-known engine, and supplies an air-fuel mixture obtained by mixing fuel to air via 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 the control circuit 16, and the throttle valve 14 supplies a signal related to the valve opening amount of the throttle valve 14 to the control circuit 16, and the fuel injection valve is opened by the control circuit 16. Being 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 the blocking valve in the present invention; hereinafter also simply referred to as a blocking valve) 24 so as to open and close the passage 22.
- a purge valve 25 is provided to open and close 23.
- the block valve 24 has a region where the valve remains in a closed state after the valve opening operation by the step motor is started and before the fuel tank 15 and the canister 21 are in communication with each other. Can be changed continuously.
- the inlet portion of the vapor passage 22 is divided into two branches, one of which is provided with a float valve 15 a and the other inlet portion is provided with a cut valve 15 b.
- the float valve 15 a is closed when the fuel tank 15 is full, so that fuel does not flow into the vapor passage 22.
- the cut valve 15b is closed when the fuel tank 15 is tilted and the fuel level rises, so that the fuel does not flow into the vapor passage 22.
- 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, the atmosphere is supplied through the atmospheric passage 28 and purge of evaporated fuel via the purge passage 23 is performed. Is done.
- the air passage 28 sucks air from the vicinity of the fuel supply port 17 a of the fuel supply pipe 17 provided in the fuel tank 15.
- a breather pipe 19 for supplying fuel to the fuel tank 15 is provided with a breather pipe 19 in parallel, and an end portion of the breather pipe 19 on the side of the fuel inlet 17a is a fuel gun (not shown) for supplying fuel to the fuel inlet 17a. ) Is fixed so as to open at a position corresponding to the tip of the fuel gun (corresponding to the fuel inlet portion in the tenth aspect of the present invention). On the other hand, the end of the breather pipe 19 on the fuel tank 15 side is fixed so as to open into the upper space in the fuel tank 15.
- the function of the breather pipe 19 is the same as the conventional one, and evaporative fuel generated in the fuel tank 15 during refueling is circulated in the vicinity of the refueling port 17a.
- An oil supply cap 18 is provided at the oil supply port 17a, and the oil supply cap 18 can be removed when supplying oil.
- the fuel filler port 17 a is exposed on the surface of the vehicle body, and a lid door 33 is provided at that portion, so that the fuel filler port 17 a is covered by the lid door 33.
- the lid door 33 is provided with a lid opener 32 for opening the lid door 33 that is normally closed.
- the lid opener 32 is an operation signal supplied from the control circuit 16 when a lid switch (corresponding to a fueling switch in the first invention of the present invention) 31 is operated by a vehicle occupant and a fueling start signal is input to the control circuit 16. In response, the lid door 33 is opened.
- the lid door 33 is provided with a lid door sensor 34 that detects opening and closing thereof.
- the control circuit 16 receives various signals necessary for controlling the valve opening time of the fuel injection valve.
- the one shown in FIG. 2 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 lid door opening signal of the lid switch 31, and the detection signal of the lid door sensor 34 are input to the control circuit 16.
- the control circuit 16 controls the opening of the blocking valve 24 and the purge valve 25 and the lid opener 32 in the case shown in FIG. Opening operation is performed.
- step S1 it is determined whether or not the lid switch 31 is turned on and a lid door open signal is issued. Until the lid switch 31 is turned on, a negative determination is made in step S1, but when the lid switch 31 is turned on, an affirmative determination is made in step S1, and the fuel tank 15 detected by the internal pressure sensor 26 is detected in step S2.
- the internal pressure (hereinafter also referred to as tank pressure) is measured and taken in.
- step S3 it is determined whether or not the tank pressure is higher than a predetermined value A (corresponding to the set pressure in the blocking valve control means of the first invention of the present invention).
- step S11 When the tank pressure is higher than the predetermined value A, an affirmative determination is made in step S3, and in step S11, the valve opening speed of the blocking valve 24 is calculated. This calculation is performed based on a map stored in the memory in the control circuit 16 in advance.
- FIG. 5 shows the contents of the map.
- step S11 the valve opening speed is set according to the tank pressure, and the valve opening speed becomes slower as the tank pressure increases.
- step S12 the closing valve 24 is opened at the valve opening speed calculated in step S11.
- the lid switch 31 is turned on, and the block valve 24 is opened at the calculated valve opening speed in a state where the tank pressure is higher than the predetermined value A.
- FIG. 4 it is shown that the tank pressure is reduced as the closing valve 24 is opened.
- step S13 in FIG. 3 it is determined whether or not the valve opening amount of the blocking valve 24 has reached a predetermined amount B. Until the valve opening amount reaches the predetermined amount B, a negative determination is made in step S13, and the valve opening in step S12 is continued. When the valve opening amount reaches the predetermined amount B and the determination in step S13 is affirmative, in step S4, the tank pressure is measured again, and in step S5, it is determined whether or not the tank pressure has become a predetermined value A or less. To do.
- Step S5 is negatively determined until the tank pressure becomes equal to or lower than the predetermined value A, but when the tank pressure becomes lower than the predetermined value A, an affirmative determination is made in step S5, and the opening amount of the blocking valve 24 is set to a predetermined amount in step S6.
- Increase the valve opening to C. 4 indicates that the opening amount of the blocking valve 24 is increased to the predetermined amount C when the tank pressure becomes the predetermined value A or less.
- a signal for opening the lid door 33 is output to the lid opener 32. Thereby, the lid door 33 is opened and refueling is enabled.
- the lid door 33 is opened after the valve opening amount of the blocking valve 24 is opened to a predetermined amount C.
- the lid door 33 is opened in step S7, and the opening amount of the blocking valve 24 is opened to the predetermined amount C.
- the lid door 33 is opened earlier. However, in actuality, even if the lid door 33 is opened, it takes some time until the fuel filler cap 18 is opened, and the closing valve 24 is opened during that time.
- step S3 if the tank pressure is not higher than the predetermined value A, a negative determination is made in step S3, the processing after step S11 is skipped, and the block valve 24 is opened to the predetermined amount C at a stroke in step S6.
- the evaporated fuel flowing through the vapor passage 22 is small and the float valve 15a is not closed. Accordingly, it is possible to shorten the time from when the lid switch 31 is turned on until the lid door 33 is opened and refueling is started.
- the timings T1 to T2 in FIG. 4 are the first stage of the opening degree control of the blocking valve 24 in the present invention
- the timings T2 to T3 are the second stage.
- the block valve 24 is opened at a speed corresponding to the tank pressure so that the float valve 15a is not closed.
- the float valve 15a is closed even if the tank pressure is low and the block valve 24 is opened quickly. Since it does not operate, the block valve 24 is opened at once without speed control.
- the opening control of the blocking valve 24 shifts from the first stage to the second stage when the tank pressure becomes a predetermined value A or less, and the predetermined value A is from the first stage to the second stage in the present invention. It corresponds to the switching pressure switched to.
- the lid door 33 when a lid door open signal is issued from the lid switch 31, if the internal pressure of the fuel tank is higher than the predetermined value A, the lid door 33 is opened and refueling is started.
- the blocking valve 24 is opened at a speed corresponding to the tank pressure, and the evaporated fuel in the fuel tank 15 is sent to the canister 21 and adsorbed.
- the blocking valve 24 is opened to a predetermined amount C at a stroke as a second stage. Therefore, the evaporated fuel in the fuel tank 15 is prevented from being released into the atmosphere from the fuel filler opening 17a during refueling.
- the valve opening control of the blocking valve 24 is performed at a speed corresponding to the tank pressure, so that the float valve 15a is opened in a range where the closing operation is not performed, and the internal pressure of the fuel tank 15 is lowered.
- the valve opening amount is increased according to the above.
- the closing valve 24 is opened at a higher speed than in the first stage. Therefore, through the first stage and the second stage, the evaporated fuel in the fuel tank 15 can be quickly adsorbed to the canister 21 within a range where the float valve 15a is not closed, and a lid door open signal is issued from the lid switch 31. The time from when the lid door 33 is opened until refueling becomes possible can be shortened.
- FIG. 6 shows a routine for opening control of the blocking valve 24 and opening control processing for the lid door 33 in the second embodiment of the present invention.
- the second embodiment is characterized in that valve opening control of the blocking valve 24 in the first stage is performed in a stepped manner as in the second stage as compared with the first embodiment.
- the other points are the same as in the first embodiment also in the second embodiment, and the repetitive description of the same parts is omitted.
- step S1 to step S7 is the same as the processing from step S1 to step S7 in FIG.
- step S21 in FIG. 6 the valve opening amount of the blocking valve 24 is calculated. This calculation is performed based on a map stored in the memory in the control circuit 16 in advance.
- FIG. 8 shows the contents of the map.
- the valve opening amount is set according to the tank pressure, and the valve opening amount decreases as the tank pressure increases.
- the blocking valve 24 is opened to the valve opening amount calculated in step S21.
- FIG. 7 shows that the lid switch 31 is turned on and the block valve 24 is opened to the calculated valve opening amount in a state where the tank pressure is higher than the predetermined value A.
- FIG. 4 it is shown that the tank pressure is reduced as the closing valve 24 is opened.
- the period from when the lid switch 31 is turned on until the lid door 33 is opened is divided into two stages, and the first time until the tank pressure becomes a predetermined value A or less.
- the closing valve 24 is controlled to be opened with the degree of opening suppressed in a range where the float valve 15a is not closed, but the next second stage (FIG. 7).
- the blocking valve 24 is opened at a stroke without being aware of the closing operation of the float valve 15a, and the extraction of the evaporated fuel from the fuel tank 15 is accelerated.
- the opening speed of the blocking valve 24 is gradually increased in two stages, the evaporated fuel in the fuel tank 15 can be adsorbed to the canister 21 quickly in a range where the float valve 15a is not closed.
- the opening degree of the block valve 24 is gradually increased as in the first embodiment.
- FIG. 9 shows a routine for opening control of the closing valve 24 and opening control processing for the lid door 33 in the third embodiment of the present invention.
- the third embodiment is different from the second embodiment in that the valve opening amount of the blocking valve 24 is feedback-controlled so that the change amount of the tank pressure in the first stage becomes a predetermined value X. .
- the other points are the same as in the second embodiment in the third embodiment, and the repetitive description of the same parts is omitted.
- steps S1 to S3, the processes of steps S21 to S22, and the processes of steps S6 to S7 are the processes of steps S1 to S3, the processes of steps S21 to S22 in FIG. This is the same as the processing in steps S6 to S7.
- step S32 it is determined whether or not the tank pressure is higher than a predetermined value A. If the tank pressure is higher than the predetermined value A, an affirmative determination is made in step S32, and the amount of change in tank pressure is calculated in step S33. Here, the amount of change in tank pressure every predetermined time is obtained.
- step S34 it is determined whether or not the obtained change amount of the tank pressure is equal to or greater than a predetermined value X. If step S34 is affirmed at a predetermined value X or more, the block valve 24 is closed by a predetermined amount ⁇ in step S35.
- step S34 If the change amount of the tank pressure is smaller than the predetermined value X, a negative determination is made in step S34, and the block valve 24 is opened by a predetermined amount ⁇ in step S36. That is, in the processing from step S31 to step S36, while the tank pressure is higher than the predetermined value A, the opening degree of the blocking valve 24 is feedback-controlled so that the change amount of the tank pressure becomes the predetermined value X.
- the change in the tank pressure and the valve opening amount of the closing valve 24 between the timings T1 to T4 in FIG. 10 shows the state of feedback control.
- the process proceeds to step S6 and subsequent steps, and as described in the first embodiment, the opening degree of the block valve 24 is rapidly increased by a predetermined amount.
- the lid door 33 is opened at time T5.
- the block valve 24 in the first stage of the valve opening control of the block valve 24, the block valve 24 is controlled to open at an opening corresponding to the tank pressure within a range in which the float valve 15a is not closed.
- the opening degree of the blocking valve 24 is feedback-controlled so that the change amount becomes a predetermined value X. That is, as in the second embodiment, the closing valve 24 is opened stepwise so as to accelerate the extraction of the evaporated fuel from the fuel tank 15 so that the speed is not too high and the float valve 15a is not closed.
- the opening degree of the blocking valve 24 is controlled.
- the vaporized fuel in the fuel tank 15 is quickly adsorbed to the canister 21 within a range in which the float valve 15a is not closed, and the lid door 33 is issued after the lid door 31 generates a lid door opening signal. It is possible to shorten the time from when the is opened to the time when refueling becomes possible.
- FIG. 11 shows a routine for opening control of the blocking valve 24 and opening control processing for the lid door 33 in the fourth embodiment of the present invention.
- the fourth embodiment is different from the third embodiment in that when the float valve 15a is closed while the closing valve 24 is controlled to open in the first stage, the float valve 15a is opened again, It is characterized in that the valve opening control of the block valve 24 in the stage can be continued.
- the other points are basically the same in the fourth embodiment as in the third embodiment, and the repetitive description of the same parts is omitted.
- step S1 to step S3 and the processing from step S6 to step S7 are the same as the processing from step S1 to step S3 and the processing from step S6 to step S7 in FIG.
- step S41 and S42 of FIG. 11 when it is determined in step S3 that the tank pressure is higher than the predetermined value A, the opening degree of the blocking valve 24 is opened to the predetermined amount B only once. Once the valve is opened in step S42, the flag F is set, and in the next processing, step S41 is negatively determined and the processing in step S42 is skipped and not executed.
- step S43 the amount of change in tank pressure is calculated.
- the amount of change in tank pressure every predetermined time is obtained.
- the predetermined value Y is the minimum change amount of the tank pressure that changes if the float valve 15a is opened.
- the timing T2 in FIG. 12 shows the state at that time. As described above, when the float valve 15a is closed, when the float valve 15a is opened again as a result of closing the opening degree of the block valve 24 to the predetermined amount D, the tank pressure is increased as shown in FIG. Again falls over time.
- step S44 If the tank pressure has fallen normally, a negative determination is made in step S44, the above processing is continued until the tank pressure becomes a predetermined value A or less, and the step is performed at a timing T3 when the tank pressure becomes a predetermined value A or less.
- a negative determination is made in S3 the process proceeds to step S6 and subsequent steps, and the opening degree of the blocking valve 24 is increased to a predetermined amount C as described in the first embodiment, and the lid door 33 is opened at the timing T4.
- step S8 the flag F is reset to an initial state.
- the closing valve 24 when it is detected that the closing valve 24 is controlled to be opened in a relatively large stepped manner in the first stage of the opening control of the closing valve 24, and then it is detected that the float valve 15a is closed.
- the opening degree of the blocking valve 24 is decreased. That is, the blocking valve 24 is opened from the beginning to close slightly when the float valve 15a is closed, so that the evaporated fuel in the fuel tank 15 can be quickly removed as long as the float valve 15a is not closed.
- the opening degree of 24 is controlled.
- the vaporized fuel in the fuel tank 15 is quickly adsorbed to the canister 21 within a range in which the float valve 15a is not closed, and the lid door 33 is issued after the lid door 31 generates a lid door opening signal. It is possible to shorten the time from when the is opened to the time when refueling becomes possible.
- FIG. 13 shows a routine for opening control of the closing valve 24 and opening control processing for the lid door 33 in the fifth embodiment of the present invention.
- the fifth embodiment is different from the fourth embodiment in that, when the float valve 15a is closed during the opening control of the block valve 24 in the first stage, the valve is gradually closed until the float valve 15a is opened again.
- the valve opening control of the block valve 24 for reducing the opening of the valve 24 to reduce the tank pressure can be restored.
- the other points are the same as in the fourth embodiment in the fifth embodiment, and the repetitive description of the same parts is omitted.
- step S1 to step S3 the processing from step S41 to step S44, and the processing from step S6 to step S7 are the processing from step S1 to step S3, the processing from step S41 to step S44 in FIG. This is the same as the processing in steps S6 to S8.
- step S46 of FIG. 13 the float valve 15a is closed during the control so that the amount of change in the tank pressure becomes smaller than the predetermined value Y, and when the affirmative determination is made in step S44, the opening degree of the block valve 24 is increased. The valve is closed by a predetermined amount ⁇ . Thereafter, the processing from step S43 to step S46 is repeated.
- step S44 The timing T2 to T5 in FIG. After timing T5, when the change amount of the tank pressure becomes equal to or greater than the predetermined value Y, a negative determination is made in step S44, the above processing is continued until the tank pressure becomes equal to or less than the predetermined value A, and the tank pressure becomes equal to or less than the predetermined value A.
- Step S3 is negatively determined at the time T6, the process proceeds to the processing after the step S6, and as described in the first embodiment, the opening degree of the blocking valve 24 is increased to the predetermined amount C at a stroke, and the lid door is reached at the time T7. 33 is opened.
- step S8 the flag F is reset to an initial state.
- the closing valve 24 when it is detected in the first stage in the opening control of the closing valve 24 that the closing valve 24 is controlled to open in a relatively large step shape, and then it is detected that the float valve 15a is closed.
- the opening degree of the blocking valve 24 is decreased by a predetermined amount ⁇ until the float valve 15a is opened again. That is, when the closing valve 24 is opened largely from the beginning and the float valve 15a is closed, the closing valve 24 is closed until the float valve 15a is opened again. As long as the float valve 15a is not closed, the fuel tank 15 is promptly opened.
- the opening degree of the blocking valve 24 is controlled so as to extract the evaporated fuel inside.
- the vaporized fuel in the fuel tank 15 is quickly adsorbed to the canister 21 within a range in which the float valve 15a is not closed, and the lid door 33 is issued after the lid door 31 generates a lid door opening signal. It is possible to shorten the time from when the is opened to the time when refueling becomes possible.
- step S7 in each flowchart in the first to fifth embodiments corresponds to the blocking valve control means in the first invention of the present invention. Further, the processing in step S7 in each flowchart in the first to fifth embodiments corresponds to the lid door opening means in the ninth invention of the present invention.
- FIG. 15 shows a sixth embodiment of the present invention.
- the amount of evaporated fuel generated in the fuel tank during refueling and circulated through the breather pipe 19 is appropriately adjusted by controlling the opening and closing of the sealing valve 24 to adjust the internal pressure of the fuel tank 15. Is. Therefore, by implementing the sixth embodiment in addition to the first embodiment described above, the following operational effects can be achieved in addition to the operational effects based on the first embodiment. That is, without adjusting the flow resistance of the breather pipe 19 having high difficulty, the internal pressure of the fuel tank 15 is adjusted by causing the blocking valve 24 to function as pressure adjusting means, regardless of environmental changes such as changes in temperature. The amount of evaporated fuel circulated by the breather pipe 19 can be adjusted appropriately.
- step S101 it is determined in step S101 whether or not a flag F2 described later is in a reset state. Since the flag F2 is initially in the reset state, an affirmative determination is made in step S101, and it is determined whether or not the lid switch 31 is turned on in the next step S102.
- the lid switch 31 is turned on after waiting for the lid switch 31 to be turned on, an affirmative determination is made in step S102, and a flag F1 for recording that the lid switch 31 is turned on in step S103. Is set.
- the blocking valve 24 is opened to the first predetermined value. This process is performed to remove the evaporated fuel accumulated in the fuel tank 15 before the start of refueling. As a result, the internal pressure of the fuel tank 15 (hereinafter also referred to as tank pressure) decreases.
- Timings T1 and T2 in FIG. 16 show the state during this time.
- step S105 When the evaporated fuel in the fuel tank 15 is smoothly discharged and adsorbed by the canister 21 and the tank pressure decreases to a predetermined pressure A or lower, an affirmative determination is made in step S105, and an open signal is output to the lid opener 32 in step S107. Then, the lid door 33 is opened.
- the fuel supply cap 18 is removed by the above-described processing after the lid switch 31 is turned on, the evaporated fuel in the fuel tank 15 is prevented from leaking from the fuel supply port 17a.
- step S107 a flag F2 for recording the state is set.
- step S108 the valve opening amount of the blocking valve 24 at that time is maintained.
- step S102 the determination in step S102 is negative. Even in this case, a negative determination is made in the next step S106, and the processing after step S104 is continued.
- step S111 when the tank pressure exceeds a predetermined pressure B (corresponding to the peak of the internal pressure in the fifteenth aspect of the present invention), an affirmative determination is made in step S111.
- the flag F3 is set, and it is recorded that the tank pressure once exceeds the predetermined pressure B. The process for confirming that the tank pressure has exceeded the predetermined pressure B is to confirm that refueling is being performed as scheduled.
- step S101 a negative determination is made in step S101 and a negative determination is also made in step S113 in the subsequent processing, so that the tank pressure is set to the predetermined pressure C (in accordance with the present invention) in step S121. It is determined whether the pressure is equal to or higher than the first pressure in the tenth invention and the first set pressure in the thirteenth invention.
- the closing valve 24 is set to a predetermined amount ⁇ (first in the thirteenth invention of the present invention). The valve is closed by a predetermined amount). If the tank pressure is lower than the predetermined pressure C also at timing T5 in FIG. 16, the block valve 24 is closed again by a predetermined amount ⁇ in step S122.
- the tank pressure once increased after the start of refueling decreases as the evaporated fuel decreases.
- the decrease in the tank pressure is suppressed and the breather pipe 19 supplies the fuel filler port 17a of the fuel tank 15.
- the purpose is to adjust the amount of evaporated fuel circulated to the portion so that it does not become too small. That is, when the amount of the evaporated fuel circulated through the breather pipe 19 is reduced, there arises a problem that the air is drawn into the fuel tank 15 through the fuel filler port 17a, and this problem is addressed.
- the evaporated fuel density in the fuel tank 15 is diluted by the air flowing in, so that it becomes easier for new evaporated fuel to be generated in the fuel tank 15. Need to be made.
- the tank pressure rapidly increases and exceeds the predetermined pressure D.
- the tank pressure exceeds a predetermined pressure D, the auto-stop function of the fuel gun is activated and fuel supply from the fuel gun is stopped.
- Such a sudden rise in tank pressure is due to the fact that the float valve 15a is closed.
- As a cause of closing the float valve 15a there are a case where the fuel is full and a case where the flow rate of the evaporated fuel flowing through the vapor passage 22 to the blocking valve 24 is high.
- the cause of the closing of the float valve 15a is the latter, it is necessary to continue the refueling except for the cause.
- step S131 when the tank pressure exceeds the predetermined pressure D and step S131 is affirmed, the block valve 24 is opened to the second predetermined value in step S132.
- the float valve 15a is opened again by opening the block valve 24 in this manner, and the refueling can be continued.
- step S141 it is detected that the lid door 33 is closed in response to the detection signal, and in the next step S142, the flags F1, F2, and F3 are reset to the initial state, and in step S143, the closing valve 24 is closed. To do. This is shown after timing T7 in FIG.
- the pressure of the sealing valve 24 on the path connecting the fuel tank 15 and the canister 21 is adjusted.
- the internal pressure of the fuel tank 15 can be adjusted, and the amount of evaporated fuel circulated by the breather pipe 19 during refueling can be adjusted appropriately.
- FIG. 17 shows a routine for opening control of the blocking valve 24 and opening control processing for the lid door 33 in the seventh embodiment of the present invention.
- the seventh embodiment is characterized in that the tank pressure is within the target pressure range, while the tank pressure during refueling is suppressed to a predetermined pressure C or less in the sixth embodiment.
- the other points are the same as in the sixth embodiment in the seventh embodiment, and the repetitive description of the same parts is omitted.
- steps S121 and S122 in FIG. 15 are merely replaced with steps S151 to S154, and the other processes are the same.
- step S151 in FIG. 17 it is determined whether or not the tank pressure is lower than the lower limit of the target pressure range (corresponding to the first pressure in the tenth aspect of the present invention). If the tank pressure is lower than the lower limit of the target pressure range, an affirmative determination is made in step S151, and the block valve 24 is closed by a predetermined amount ⁇ in step S152. The timing T4 in FIG. 18 shows this state. On the other hand, if the tank pressure is equal to or higher than the lower limit of the target pressure range, a negative determination is made in step S151, and it is determined in step S153 whether the tank pressure is higher than the upper limit of the target pressure range.
- step S153 If the tank pressure is higher than the upper limit of the target pressure range, an affirmative determination is made in step S153, and the block valve 24 is opened by a predetermined amount ⁇ in step S154.
- the timing T5 in FIG. 18 shows this state.
- the tank pressure again becomes lower than the lower limit of the target pressure range, and the block valve 24 is closed by a predetermined amount ⁇ .
- the closing valve 24 is controlled to open and close so that the tank pressure falls within the target pressure range (corresponding to the second set pressure in the fourteenth aspect of the present invention).
- the tank pressure once increased after the start of refueling decreases as the evaporated fuel decreases, whereas the tank pressure is kept within the target pressure range and the breather pipe 19 fills the fuel filler port 17a of the fuel tank 15.
- the purpose is to adjust the amount of evaporated fuel circulated to the portion so that it does not become too small.
- FIG. 19 shows the opening control processing routine of the closing valve 24 and the opening control process of the lid door 33 in the eighth embodiment of the present invention.
- the tank pressure during refueling is suppressed to a predetermined pressure C or less in the sixth embodiment, the tank pressure is made lower than the pressure at which the auto-stop function of the fuel gun operates.
- the other points are also substantially the same as in the sixth embodiment in the eighth embodiment, and a repetitive description of the same parts is omitted.
- step S101 to step S108 is the same as the processing from step S101 to step S108 in FIG.
- step S131 it is determined whether or not the tank pressure exceeds a predetermined pressure D. If the tank pressure does not exceed the predetermined pressure D, a negative determination is made in step S131, and the valve opening amount of the blocking valve 24 is maintained in step S108, but if the tank pressure exceeds the predetermined pressure D, an affirmative determination is made in step S131.
- step S133 the valve opening amount of the blocking valve 24 is increased by ⁇ .
- the timing T3 in FIG. 20 shows this state. The tank pressure exceeds the predetermined pressure D because the float valve 15a is closed, and the auto-stop function of the refueling gun works to stop the refueling from the refueling gun. Tank pressure drops rapidly.
- the float valve 15a can be opened again due to a decrease in the tank pressure, and refueling continues. Is done.
- step S141 the flags F1 and F2 are reset and returned to the initial state. Valve 24 is closed.
- the blocking valve 24 is opened by an extra ⁇ each time the internal pressure of the fuel tank 15 becomes excessively high, thereby suppressing the tank pressure from being excessively high.
- the breather pipe 19 is adjusted so that the amount of evaporated fuel circulated to the fuel filler port 17a portion of the fuel tank 15 does not become excessive.
- the predetermined pressure D corresponds to the second pressure in the sixteenth aspect of the present invention
- the valve opening amount ⁇ of the blocking valve 24 corresponds to the second predetermined amount in the sixteenth aspect of the present invention.
- the predetermined pressure D is made equal to the pressure at which the auto-stop function of the fuel gun operates, but it may be slightly lower than the pressure at which the auto-stop function of the fuel gun operates. In that case, before the auto-stop function of the refueling gun works, the opening degree of the blocking valve 24 is increased and the tank pressure is kept low. By doing so, the tank pressure can be suppressed to a slightly lower pressure than the auto stop function works, and the auto stop function can be prevented from inadvertently working, and the lubrication can be performed smoothly without interruption. Can do.
- steps S121 and S122 and steps S131 and S132 in the flowchart of FIG. 15 in the sixth embodiment correspond to the closing valve control means in the tenth and thirteenth inventions of the present invention.
- steps S151 to S154 and steps S131 and S132 in the flowchart of FIG. 17 in the seventh embodiment corresponds to the closing valve control means in the tenth and fourteenth aspects of the present invention.
- steps S131 and S133 in the flowchart of FIG. 19 in the above-described eighth embodiment corresponds to the blocking valve control means in the tenth and sixteenth aspects of the present invention.
- the flow control valve is the step motor type block valve 24, but a ball valve having a structure in which the valve opening amount is continuously changed by the rotation of the ball-shaped valve body may be used.
- 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.
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Abstract
Description
図2、3は、本発明の第1実施形態を示す。この実施形態は、図2に示すように、車両のエンジンシステム10に蒸発燃料処理装置20を付加している。
Claims (20)
- 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接続する経路上に、燃料タンクとキャニスタとの連通を制御する封鎖弁を備え、且つ燃料タンクから燃料が前記経路上に流出するのを防止するフロート弁を備えた蒸発燃料処理装置において、
燃料タンクへの給油の開始を指示するために操作され、給油開始信号を発する給油スイッチと、
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、
前記給油スイッチから給油開始信号が発せられ、且つ前記内圧センサによって検出される燃料タンクの内圧が予め設定された設定圧力より高いとき、前記フロート弁が作動しない範囲内で前記封鎖弁を開弁させ、開弁開始時から前記燃料タンクの内圧が低下するのに応じて前記封鎖弁の開弁速度を速くする封鎖弁制御手段とを備える蒸発燃料処理装置。 - 請求項1において、
前記封鎖弁制御手段は、開弁開始時からの前記封鎖弁の開度制御を、少なくとも2段階に分けて行い、開弁開始時の第1段階に比べて、その後の第2段階は開度を大きくされ、且つ開弁速度を速くされる蒸発燃料処理装置。 - 請求項2において、
前記封鎖弁制御手段は、前記第1段階では前記封鎖弁の開度を燃料タンクの内圧に応じて制御し、前記第2段階では予め決められた量だけ階段状に前記封鎖弁を開くようにする蒸発燃料処理装置。 - 請求項3において、
前記封鎖弁制御手段は、前記第1段階では前記封鎖弁の開弁速度が前記内圧センサによって検出される燃料タンクの内圧に応じて制御され、内圧が高い程遅くされる蒸発燃料処理装置。 - 請求項2において、
前記封鎖弁制御手段の第1及び第2段階では、前記封鎖弁の開度が階段状に大きくされる蒸発燃料処理装置。 - 請求項5において、
前記封鎖弁制御手段は、前記第1段階では前記封鎖弁の開弁量が前記内圧センサによって検出される燃料タンクの内圧に応じて制御され、内圧が高い程小さくされる蒸発燃料処理装置。 - 請求項5又は6において、
前記封鎖弁制御手段は、前記第1段階では前記内圧センサによって検出される燃料タンクの内圧の低下勾配が所定値以上とならないように前記封鎖弁の開度制御を行う蒸発燃料処理装置。 - 請求項2乃至7のいずれかにおいて、
前記封鎖弁制御手段における前記第1段階と第2段階との切り替えは、前記内圧センサによって検出される燃料タンクの内圧が予め決めた切替圧力に達したときに行う蒸発燃料処理装置。 - 請求項8において、
前記封鎖弁制御手段は、前記封鎖弁の開弁開始時に前記内圧センサによって検出される燃料タンクの内圧が前記切替圧力より低いとき、前記第1段階の封鎖弁の開度制御を行わず、前記第2段階の制御のみを行う蒸発燃料処理装置。 - 請求項1乃至9のいずれかにおいて、
前記封鎖弁制御手段は、前記フロート弁の閉作動を検出したとき、前記封鎖弁の開度を所定量減少させる蒸発燃料処理装置。 - 請求項10において、
前記フロート弁の閉作動の検出は、前記封鎖弁を開弁している状態で燃料タンク内圧の低下量が小さいことを検出して行う蒸発燃料処理装置。 - 請求項10又は11において、
前記封鎖弁の開度の減少は、階段状に予め決められた所定量だけ封鎖弁を閉じる制御、若しくは前記フロート弁が再び開くまで連続的に封鎖弁の開度を減少させる制御によって行う蒸発燃料処理装置。 - 請求項1乃至12のいずれかにおいて、
前記給油スイッチから給油開始信号が発せられ、且つ前記内圧センサによって検出される燃料タンクの内圧が前記設定圧力より低いとき、燃料タンクの給油口を閉鎖しているリッドドアを開放するリッドドア開手段を備える蒸発燃料処理装置。 - 給油中に燃料タンク内で発生した蒸発燃料を燃料タンクの給油口部分に循環させるようにブリーザ管を備え、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接続する経路上に、燃料タンクとキャニスタとの連通を制御する封鎖弁を備えた蒸発燃料処理装置において、
給油開始後、前記封鎖弁の開度を所定開度に制御し、該所定開度は、燃料タンクの内圧が、ブリーザ管を通じて必要量の蒸発燃料を燃料タンクの給油口部分に循環させるために必要な第1圧力より高くなる開度とする封鎖弁制御手段を備える蒸発燃料処理装置。 - 請求項14において、
前記所定開度は、燃料タンクの内圧が第2圧力より低くなる開度とし、該第2圧力は、燃料タンクの満タン時に給油ガンによる給油を停止するオートストップ機能が働く圧力に相当する蒸発燃料処理装置。 - 請求項14又は15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を備え、
前記封鎖弁制御手段は、給油開始後、前記封鎖弁の開度を、前記内圧センサによって検出される燃料タンクの内圧に基づいて制御する蒸発燃料処理装置。 - 請求項16において、
前記封鎖弁制御手段は、前記内圧センサによって検出される燃料タンクの内圧が予め設定された第1設定圧力より低くなると、前記封鎖弁の開度を第1所定量閉じる蒸発燃料処理装置。 - 請求項16において、
前記封鎖弁制御手段は、前記内圧センサによって検出される燃料タンクの内圧が予め設定された第2設定圧力となるように前記封鎖弁の開度を制御する蒸発燃料処理装置。 - 請求項16乃至18のいずれかにおいて、
前記封鎖弁制御手段は、給油開始時に燃料タンク内で発生する蒸発燃料によって上昇する内圧のピークを検出した後、前記封鎖弁の開度制御を行う蒸発燃料処理装置。 - 請求項16乃至19のいずれかにおいて、
前記封鎖弁制御手段は、前記内圧センサによって検出される燃料タンクの内圧が前記第2圧力に達したとき、前記封鎖弁を所定開度まで開く、又は第2所定量だけ開く蒸発燃料処理装置。
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