JP2012112304A - Evaporated fuel treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporated fuel treatment device that can suitably adjust an amount of evaporated fuel adsorbed in a canister.SOLUTION: The evaporated fuel treatment device 1 includes: a fuel tank 3; the canister 13 for adsorbing evaporated fuel generated in the fuel tank 3; a control valve 11 provided in a vapor passage 9 making the fuel tank 3 and the canister 13 communicate with each other, and opening and closing the vapor passage 9; a filler pipe 4 made to communicate with the fuel tank 3 and into which fuel is introduced from an opening during refueling; a fuel lid 7 for covering the opening; a lid switch 8 for outputting an opening command for opening the fuel lid 7; and an ECU 2. The ECU 2 releases the lock of the fuel lid 7 based on the opening command, executes control for opening the control valve 11 when the opening command is outputted and closing the control valve after the lapse of a first prescribed period of time, and changes the first prescribed period of time according to the start or the end of refueling.

Description

  The present invention relates to an evaporated fuel processing apparatus that includes a canister that adsorbs evaporated fuel generated in a fuel tank and processes the evaporated fuel.

  In the conventional evaporative fuel treatment system, the evaporative fuel generated in the fuel tank is prevented from being released into the atmosphere during refueling, and the evaporative fuel is adsorbed to the canister to reduce the pressure in the fuel tank. (For example, refer to Patent Document 1).

JP 2004-156495 A

  In a conventional evaporative fuel processing apparatus, a control valve is provided in a vapor passage that communicates a fuel tank and a canister. The control valve is opened before refueling, and evaporative fuel in the fuel tank is adsorbed to the canister via the control valve. So-called depressurization is performed to reduce the pressure in the fuel tank. If the pressure can be reduced, it is possible to prevent the evaporated fuel from being released into the atmosphere during refueling.

  The conventional fuel vapor processing apparatus is configured to open the control valve when the lid switch outputs a fuel lid opening command and close the control valve after a predetermined time has elapsed. However, with such a configuration, even if refueling is completed early, a large amount of evaporated fuel is adsorbed to the canister, or even before refueling is completed, the control valve is closed and evaporated fuel is returned to the canister. There is a problem that it cannot be adsorbed.

  Therefore, an object of the present invention is to provide an evaporative fuel processing apparatus capable of suitably adjusting the amount of evaporative fuel adsorbed on a canister.

  The present invention has been devised to solve the above-described problems, and communicates a fuel tank for storing fuel, a canister for adsorbing evaporated fuel generated in the fuel tank, and the fuel tank and the canister. A control valve provided in the vapor passage and capable of opening and closing the vapor passage, a control means for controlling the opening of the control valve to flow the evaporated fuel, and the fuel tank are communicated, and fuel is introduced from the opening during refueling A filler pipe; a fuel lid covering the opening; an opening command means for outputting an opening command for opening the fuel lid; and a lock releasing means for unlocking the fuel lid based on the opening command. The evaporative fuel processing apparatus, wherein the control means opens the control valve and outputs a first predetermined time when the open command is output. Performs control to close the control valve after over, depending on the start or end of the fueling, and changes the first predetermined time.

  According to such a configuration, the time for closing the control valve is changed according to the start or end of refueling, so that the amount of evaporated fuel to be adsorbed by the canister can be suitably adjusted.

  When the control means determines that refueling has started, it is desirable to shorten the first predetermined time.

  According to such a configuration, the amount of evaporated fuel adsorbed on the canister can be reduced by closing the control valve early.

  When the control means determines that refueling has ended, it is desirable to change the first predetermined time short.

  According to such a configuration, the amount of evaporated fuel adsorbed on the canister can be reduced by closing the control valve early.

  When the control means determines that refueling has started before a second predetermined time shorter than the first predetermined time, it is desirable to change the first predetermined time shorter.

  According to such a configuration, the amount of evaporated fuel adsorbed on the canister can be reduced by closing the control valve early.

  When the control means determines that refueling has started after the elapse of a second predetermined time shorter than the first predetermined time, it is desirable that the first predetermined time be changed longer.

  According to this configuration, by closing the control valve late, it is possible to prevent the evaporated fuel from being adsorbed by the canister because the control valve is closed even during refueling.

  The evaporative fuel processing device further includes a fuel amount detection means for detecting the amount of the fuel stored in the fuel tank, and the control means increases the amount of the fuel detected by the fuel amount detection means. In this case, it is desirable to determine that refueling has started.

  The evaporative fuel processing device further includes a fuel amount detection means for detecting the amount of the fuel stored in the fuel tank, and the control means is configured to detect a predetermined amount of the fuel detected by the fuel amount detection means. It is desirable to determine that refueling has ended when the fuel amount reaches a constant or after the amount of the fuel detected by the fuel amount detection means becomes constant.

  According to the present invention, the amount of evaporated fuel to be adsorbed on the canister can be suitably adjusted.

It is a block diagram of the evaporative fuel processing apparatus (at the time of airtight holding) which concerns on embodiment of this invention. It is a block diagram which shows ECU which concerns on embodiment of this invention. It is a time chart for demonstrating the basic composition of the control method of the control valve and fuel lid lock by ECU which concerns on embodiment of this invention. It is a block diagram of the evaporative fuel processing apparatus which concerns on embodiment of this invention, and has shown the state at the time of refueling. It is a time chart for demonstrating the change of the timer end time in the evaporative fuel processing apparatus which concerns on embodiment of this invention. It is a time chart for demonstrating the change of the timer end time in the evaporative fuel processing apparatus which concerns on embodiment of this invention. It is a time chart for demonstrating the change of the timer end time in the evaporative fuel processing apparatus which concerns on embodiment of this invention. It is a flowchart for demonstrating the control method of the control valve and fuel lid lock by ECU which concerns on embodiment of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 1, the block diagram of the evaporative fuel processing apparatus (at the time of airtight holding) 1 which concerns on embodiment of this invention is shown. The fuel vapor processing apparatus 1 is connected to a vapor passage (pipe) 9, a control valve (electromagnetic valve) 11 connected on the vapor passage (pipe) 9, and a vapor passage (pipe) 9 in parallel with the control valve 11. A high-pressure two-way valve 10, a canister 13 to which one end of a vapor passage (pipe) 9 is connected, and a purge having one end connected to the canister 13 and the other end connected to an intake passage (not shown) of the internal combustion engine A passage (pipe) 18, a purge control valve 14 connected on the purge passage (pipe) 18, a pressure sensor 15 for detecting the pressure in the canister 13, and a pressure in the fuel tank 3 (tank pressure Ptank) are detected. Pressure sensor 16 and ECU (Electronic Control Unit) 2.

  The other end of the vapor passage (pipe) 9 is connected to the fuel tank 3. A filler pipe 4 and a breather pipe 5 are connected to the fuel tank 3. The other end of the breather pipe 5 is connected to the upper part of the filler pipe 4. The opening at the other end of the filler pipe 4 is covered with a filler cap 6.

  The fuel lid 7 is provided at a position where the opening of the filler pipe 4 of the vehicle body (not shown) and the filler cap 6 face, and further covers the filler cap 6. The fuel lid 7 is provided with a fuel lid lock 7a as a lock mechanism, and the fuel lid lock 7a is locked and closed except when refueling. When the lid switch 8 is pushed by the driver or the like, and then the ECU 2 determines that a predetermined condition is satisfied, the ECU 2 releases the lock by the fuel lid lock 7a and automatically opens the fuel lid 7. When the fuel lid 7 is opened, the driver or the like can open the filler cap 6 and supply fuel to the fuel tank 3. Further, the fuel lid 7 can be opened manually by a driver or the like (direct operation of the fuel lid 7 outside the vehicle).

  The fuel tank 3 has a pump 3 a that sends fuel to an internal combustion engine (not shown), and a float valve 3 b and a cut valve 3 c provided at an opening to a vapor passage (pipe) 9. The float valve 3 b closes the opening to the vapor passage (pipe) 9 when the so-called full tank is reached, and prevents fuel from entering the vapor passage (pipe) 9. The cut valve 3c does not block the opening to the vapor passage (pipe) 9 even when the so-called full tank is reached. However, for example, the fuel tank 3 tilts and the fuel level rises so that the fuel passes through the vapor passage (pipe) 9. To prevent entering.

  The canister 13 can adsorb evaporated fuel generated in the fuel tank 3 that stores fuel. The canister 13 contains activated carbon or the like, and the evaporated fuel is adsorbed by the activated carbon or the like. Conversely, the canister 13 takes air from the atmosphere and sends the taken air to the purge passage (pipe) 18 to purge the evaporated fuel adsorbed in the canister 13 to the internal combustion engine outside the canister 13. Can do.

  The control valve 11 is provided in a vapor passage 9 that allows the fuel tank 3 and the canister 13 to communicate with each other. As the control valve 11, a normally closed electromagnetic valve can be used. This control valve 11 is normally closed by a control valve control unit 2b1 of the ECU 2 in which the valve body urged by the urging means is seated on the valve seat, thereby closing the flow of the evaporated fuel. When the coil is energized, magnetic flux is generated in the movable core by excitation of the coil, and the movable core is attracted to the fixed core by magnetic force. The valve body attached to the movable core moves against the urging force of the urging means and moves away from the valve seat, and the control valve 11 is in a valve open state that allows the flow of the evaporated fuel.

  The high-pressure two-way valve 10 has a mechanical valve in which a diaphragm positive pressure valve and a negative pressure valve are combined. The positive pressure valve is configured to open when the pressure on the fuel tank 3 side becomes higher by a predetermined pressure than the pressure on the canister 13 side. By this valve opening, the evaporated fuel that has become high pressure in the fuel tank 3 is sent to the canister 13. The negative pressure valve is configured to open when the pressure on the fuel tank 3 side becomes a predetermined pressure lower than the pressure on the canister 13 side. By this opening, the evaporated fuel stored in the canister 13 is returned to the fuel tank 3.

  The purge control valve 14 is provided in a purge passage (pipe) 18. An electromagnetic valve can be used as the purge control valve 14. The purge control valve 14 can be controlled to be opened and closed by the ECU 2.

  A piezoelectric element can be used for the pressure sensors 15 and 16. The pressure sensor 15 is connected to the canister 13 and can detect the pressure in the canister 13. Further, since the pressure in the canister 13 is equal to the pressure in the purge passage 18 and the pressure on the canister 13 side relative to the control valve 11 in the vapor passage 9, the pressure sensor 15 substantially has those pressures. Can also be detected. The detected pressure is transmitted to the ECU 2.

  The evaporative fuel processing device 1 detects the open / closed state of the fuel lid 7 and outputs to the ECU 2 a fuel lid open / closed state detecting means 21, and detects the amount of liquid fuel stored in the fuel tank 3 and outputs it to the ECU 2. And a fuel amount detection means 22 as a sensor. The fuel lid open / closed state detection means 21 can be detected using, for example, a switch circuit.

  Next, the ECU 2 will be described with reference to FIG. The ECU 2 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read-Only Memory), an input / output circuit, and the like. As shown in FIG. And control means 2b.

  The unlocking means 2a acquires the opening command output from the lid switch 8, and when the opening command is acquired, outputs the unlocking signal to the fuel lid lock 7a and releases the lock of the fuel lid 7. Moreover, the lock release means 2a outputs to the control means 2b that the opening command has been acquired.

  The control means 2b controls the drive of the control valve 11 and switches between an open state that allows the vapor passage 9 to flow through the evaporated fuel and a closed state that blocks the flow of the vapor passage 9 through the vaporized fuel. Is possible. The control means 2b includes a control valve control unit 2b1, a timer 2b2, a fuel supply determination unit 2b3, and a timer end time change unit 2b4.

The control valve control unit 2b1 performs the opening control of the control valve 11 when the opening command output from the lid switch 8 is acquired via the lock release means 2a, and also uses the timer 2b2 to open the control valve 11 Count. Timer 2b2 counts from the count start until the timer end time T _E, the control valve control unit 2b1 and the timer end time changing unit 2b4 monitors the counted time. Time from the count start until the timer end time T _E is the first predetermined time. The control valve control unit 2b1, the timer 2b2 to practice the closing control of the control valve 11 when it reaches the timer end time T _E. Further, the control valve control unit 2b1 also performs the closing control of the control valve 11 when the closed state of the fuel lid 7 detected by the fuel lid open / close state detecting means 22 is acquired in a state where the control valve 11 is open.

  Refueling determination unit 2b3 determines the start of refueling and the end of refueling, and outputs the determination result to timer end time changing unit 2b4. In the present embodiment, the fuel supply determination unit 2b3 acquires the amount of fuel detected by the fuel amount detection means 21, and determines the start and end of fuel supply based on the amount of fuel. Specifically, the fuel supply determination unit 2b3 determines that the fuel supply starts when the amount of detected fuel increases, and when the amount of detected fuel reaches a predetermined amount (full tank) or is detected. When the amount of fuel that has been used becomes constant after starting to increase (in this embodiment, constant for a specified time ta (see FIG. 7)), it is determined that refueling has ended.

  A basic configuration of a method for controlling the fuel lid lock 7a and the control valve 11 by the ECU 2 will be described with reference to the time chart of FIG. 3 (see FIGS. 1 to 4 as appropriate). First, when the unlocking means 2a of the ECU 2 acquires an opening command output from the lid switch 8 by an operation by a driver or the like, the ECU 2 is activated and the control valve control unit 2b1 controls the opening of the control valve 11. And the timer 2b2 starts counting.

Subsequently, the unlocking means 2a determines whether or not the pressure (Ptank) in the fuel tank 3 has decreased until it reaches the lid opening permission pressure (Pth). If the lid opening permission pressure Pth has been reached, the lock release means 2a outputs a lock release signal to the fuel lid lock 7a and opens the lid of the fuel lid 7 as shown in FIG. Thereafter, normally, the driver or the like opens the filler cap 6 and refuels. After refueling, the driver or the like closes the filler cap 6, and further closes the lid of the fuel lid 7. When the lid is closed, a lid closed state signal is output from the fuel lid open / close state detecting means 22. However, without the driver or the like refueling, even if forgotten closed lid of the fuel lid 7, if the count by the timer 2b2 has reached the timer end time T _E, the control valve control unit 2b1 includes The control of the control valve 11 is performed, and the ECU 2 stops activation.

  Note that the unlocking means 2a has not acquired the opening command output from the lid switch 8 by the operation of the driver or the like, and the control means 2b has detected the fuel lid 7 detected by the fuel lid open / close state detecting means 22. When the open state is acquired, the control means 2b performs the open control of the control valve 11 (FIG. 1 → FIG. 4). According to this configuration, the pressure in the fuel tank 3 can be released even when the fuel lid 7 is opened manually instead of automatically.

Returning to Figure 2, the timer end time changing unit 2b4, based on the determination result by the refueling determination unit 2b3, changes the timer end time T _E for timer 2b3.

In particular, when it is determined that the time is fueling before the predetermined time T _A before the timer end time T _E that is set has been initiated by the refueling determination unit 2b3, the timer end time changing unit 2b4 changes the timer end time T _E to a time T _E1 earlier than that (see FIG. 5). The time from the count start to the predetermined time T _A is the second predetermined time, and the context of each time is T _A <T _E1 <T _E. Here, the timer end time changing unit 2b4 is a predetermined time after the determination by the time T _B and fueling has started t ₁ can be set to T _E1. The predetermined time t ₁ is set longer than a general time required for fuel to be supplied from the color (E) to the full tank (F) and the filler cap 6 and the fuel lid 7 to be closed. Stored in the unit 2b4 in advance. The time from a predetermined time T _A to the timer end time T _E, may be set to the same length as the predetermined time t _1.

Further, when it is determined that refueling after a predetermined time T _A before the timer end time T _E is started by the refueling determination unit 2b3, the timer end time changing unit 2b4, it timer end time T _{E Is} changed to a later time _TE2 (see FIG. 6). The context of each time is T _A <T _E <T _E2 . Here, the timer end time changing unit 2b4 is a predetermined time after the determination by the time T _C and fueling has started t ₁ can be set to T _E2.

If the refueling determination unit 2b3 determines that refueling has ended, the timer end time changing unit 2b4 determines that the timer end time T _E (in this embodiment, the timer end time is T _E1 or T _E2. , described as T _E for simplicity of explanation) a change than before the time T _E3 (see Fig. 7). The context of each time is T _E3 <T _E. Here, the timer end time changing unit 2b4, the refueling can be set with the time T _E3 a predetermined time after t ₂ of the determined time T _D has ended, at the previous time T _E3 is modified in this case timer it may become later than the end time T _E may be configured not to change. The predetermined time t ₂ is set longer than the typical time required to close the filler cap 6 and the fuel lid 7, it is stored in advance in the timer end time changing unit 2b4.

  Next, a method for controlling the fuel lid lock 7a and the control valve 11 by the ECU 2 will be described with reference to the flowchart of FIG. 8 (see FIGS. 1, 2, and 4 as appropriate). First, when the driver presses the lid switch 8, the lid switch 8 outputs an opening command (Yes in step S1), and the unlocking means 2a acquires the opening command and outputs it to the control valve control unit 2b1.

  Subsequently, the control valve control unit 2b1 acquires an opening command, performs opening control (FIG. 1 → FIG. 4) of the control valve 11 based on the opening command (step S2), and counts by the timer 2b2. (Step S3).

  Subsequently, the lock release means 2a determines whether or not the tank internal pressure Ptank detected by the pressure sensor 16 is equal to or lower than a threshold Pth that is a lid opening permission pressure (step S4), and the tank internal pressure Ptank is equal to or lower than the threshold Pth. If it is determined that there is (Yes in step S4), a lock release signal is output to the fuel lid lock 7a and the fuel lid 7 is opened (FIG. 1 → FIG. 4).

  Subsequently, the refueling determination unit 2b3 determines the end of refueling based on the detection result of the fuel amount detection means 21, and outputs the determination result to the timer end time changing unit 2b4.

If the counted time by the timer 2b2 has not exceeded the predetermined time T _A in (No in step S6), and in a case where it is determined refueling is started with the refueling determination unit 2b3 (Yes in step S7A), timer The end time changing unit 2b4 shortens the timer end time T _E to T _E1 (step S8A).

Further, when the counted time by the timer 2b2 has passed a predetermined time _{T A} (Yes in step S6), and when it is determined refueling is started with the refueling determination unit 2b3 (Yes at Step S7B), the timer end time changing unit 2b4 extends the timer end time _{T E} to _{T E2} (step S8B).

After execution of step S8A, in the case of No in step S7A, after execution of step S8B, and in the case of No in step S7B, when the refueling determination unit 2b3 determines that refueling has ended (Yes in step S9). The timer end time changing unit 2b4 shortens the timer end time T _E (which may be T _E1 or T _E2 ) to T _E3 (step S10).

Subsequently, when the time counted by the timer 2b2 has passed the timer end time T _E (which may be T _E1 , T _E2 or T _E3 ) (Yes in step S11), the control valve control unit 2b1 The control valve 11 is closed (step S13) and the timer 2b2 is reset. Further, even when the time counted by the timer 2b2 has not passed the timer end time T _E (which may be T _E1 , T _E2, or T _E3 ) (No in step S11), the fuel lid open / close state is detected. When the closed state of the fuel lid 7 detected by the means 22 is acquired (Yes in Step S12), the control valve control unit 2b1 performs the closing control of the control valve 11 (Step S13) and resets the timer 2b2. To do. In the case of No in step S12, this flow returns to step S4.

  The evaporative fuel processing apparatus 1 according to the embodiment of the present invention changes the time at which the timer end time changing unit 2b4 closes the control valve 11 according to the determination of refueling start or refueling end by the refueling determination unit 2b3. The amount of evaporated fuel to be adsorbed can be suitably adjusted.

In particular, fuel vapor processing apparatus 1 according to an embodiment of the present invention, the predetermined time T _{when A} refueling before is determined was started with the refueling determination unit 2b3, the timer end time changing portion 2b4 timer end time Since T _E is changed to a time T _E1 earlier than that, the control valve control unit 2b1 closes the control valve 11 early so that the amount of evaporated fuel adsorbed on the canister 13 can be reduced.

Further, in the fuel vapor processing apparatus 1 according to the embodiment of the present invention, the timer end time changing unit 2b4 determines that the refueling determination unit 2b3 determines that refueling has started after the lapse of the predetermined time T _{A. Since E} is changed to a later time T _E2 , the control valve control unit 2b1 closes the control valve 11 late, so that the control valve 11 is closed even during refueling, and the evaporated fuel enters the canister 13. It can be prevented that it is not adsorbed. That is, if the control valve 11 is closed during the refueling operation, the fuel does not enter the fuel tank 3 even though the desired amount of refueling has not been completed, so it is necessary to operate the refueling gun again. However, the evaporative fuel processing apparatus 1 according to the embodiment of the present invention can avoid such a situation, and can improve the fuel supply merchantability.

Moreover, the evaporative fuel processing apparatus 1 according to an embodiment of the present invention, when the fuel supply is determined to have ended by refueling determination unit 2b3, the timer end time changing portion 2b4 is before the timer end time T _E than since changing the time T _E3, the control valve control portion 2b1 is to close the control valve 11 as soon as possible, thereby reducing the amount of evaporative fuel adsorbed by the canister 13.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the summary of this invention. For example, the lock release means 2a may not be configured to transfer the opening command to the control means 2b, but the lock release means 2a and the control valve control unit 2b1 of the control means 2b may both acquire the opening command. Further, in step S10, the timer end time changing unit 2b4, instead of shortening the timer end time of the timer 2b2, count time from the count start until the timer end time according to another timer set to a predetermined time t ₂ The control valve control unit 2b1 may be configured to perform the closing control of the control valve 11 when such another timer has passed the timer end time.

  Further, the fuel supply determination unit 2b3 may be configured to determine the start of fuel supply and the end of fuel supply only when the open state of the fuel lid is detected by the fuel lid open / close state detection means 22. When the fuel vapor processing apparatus 1 of the present invention further includes filler cap open / close state detection means for detecting the open / close state of the filler cap 6, the fuel supply determination unit 2 b 3 uses the filler cap open / close state detection means to detect the filler cap 6. Only when the open state of the fuel is detected, the start of refueling and the end of refueling may be determined. The open state of the fuel lid 7 is detected by the fuel lid open / close state detecting means 22 and the filler cap open / closed state detecting means is detected. Therefore, the configuration may be such that only when the open state of the filler cap 6 is detected, the start of refueling and the end of refueling are determined.

  Further, the fuel supply determination unit 2b3 may be configured to determine the start of fuel supply and the end of fuel supply using the tank internal pressure Ptank detected by the pressure sensor 16. In this case, the fuel supply determination unit 2b3 is inserted into the filler pipe 4 when the fuel supply gun is inserted into the filler pipe 4 except during normal control (for example, when the open state of the fuel lid is detected by the fuel lid open / close state detection means 22). If the tank internal pressure Ptank rises, it is determined that refueling is started, and after it is determined that refueling is started, the refueling gun is detached from the filler pipe 4, so that it can be determined that refueling is finished if the tank internal pressure Ptank is reduced.

  Further, as the control valve 11, a ball valve can be used instead of the normally closed electromagnetic valve. The ball valve is fully closed when the opening is zero degrees and fully opened when the opening is 90 degrees. The opening degree of the control valve (ball valve) 11 can be detected by an opening degree detection means (not shown), and the detected opening degree is transmitted to the control means 2. Further, the control means 2 can perform open control for opening the control valve 11 and close control for closing, and also variably controls the speed at which the control valve 11 is opened and closed, and the opening when the control valve 11 is opened. Can be adjusted. That is, the ball valve as the control valve 11 is a valve capable of linearly controlling the opening / closing speed and the opening degree.

  Further, a three-way valve is further provided, one of the three-way valves is connected to a pressure sensor, and the remaining two ports of the three-way valve are connected to the canister 13 side of the control valve 11 of the vapor passage 9 and the control valve 11 of the vapor passage 9. Alternatively, the fuel tank 3 may be connected to the fuel tank 3 side. The ECU 2 controls the three-way valve to connect the pressure sensor 16 and the control valve 11 of the vapor passage 9 to the canister 13 side, or to connect the pressure sensor 16 and the control passage 11 of the vapor passage 9 to the fuel tank 3 side. can do. If the pressure sensor 16 is connected to the canister 13 side of the vapor passage 9 relative to the control valve 11, the pressure sensor 16 will adjust the pressure on the canister 13 side relative to the control valve 11 in the vapor passage 9, and further the pressure inside the canister 13. Can be detected. Since the pressure detected at this time should coincide with the pressure detected by the pressure sensor 15, the pressure sensor 15 and 16 can be calibrated and diagnosed. If the three-way valve is controlled so that the pressure sensor 16 and the fuel tank 3 side are connected to the vapor passage 9 than the control valve 11, the pressure sensor 16 is connected to the fuel tank 3 side pressure relative to the control valve 11 in the vapor passage 9. Furthermore, the pressure in the fuel tank 3 (tank pressure Ptank) can be detected. The pressure sensor 16 transmits the detected pressure to the ECU 2.

DESCRIPTION OF SYMBOLS 1 Evaporated fuel processing apparatus 2a Lock release means 2b Control means 3 Fuel tank 6 Filler cap 7 Fuel lid 7a Fuel lid lock 8 Lid switch (open command means)
9 Vapor passage 11 Control valve 13 Canister 21 Fuel lid open / closed state detection means 22 Fuel amount detection means

Claims (7)

A fuel tank for storing fuel;
A canister that adsorbs evaporated fuel generated in the fuel tank;
A control valve provided in a vapor passage communicating the fuel tank and the canister and capable of opening and closing the vapor passage;
Control means for opening the control valve to flow the evaporated fuel;
A filler pipe that communicates with the fuel tank and into which fuel is introduced from an opening when refueling;
A fuel lid covering the opening;
An opening command means for outputting an opening command for opening the fuel lid;
Based on the opening command, unlocking means for unlocking the fuel lid;
An evaporative fuel processing apparatus comprising:
The control means performs control to open the control valve when the opening command is output and close the control valve after a first predetermined time has elapsed, and according to the start or end of refueling, The evaporative fuel processing apparatus characterized by changing predetermined time. The evaporated fuel processing apparatus according to claim 1, wherein the control unit changes the first predetermined time short when it is determined that refueling has started. The evaporated fuel processing apparatus according to claim 1, wherein when the control unit determines that refueling has been completed, the first predetermined time is shortened. When the control means determines that refueling has started before a second predetermined time shorter than the first predetermined time, the control means changes the first predetermined time shorter. Item 2. The fuel vapor processing apparatus according to Item 1. The said control means changes said 1st predetermined time long, when it determines with refueling having been started after progress of 2nd predetermined time shorter than said 1st predetermined time. The evaporative fuel treatment device described in 1. A fuel amount detection means for detecting the amount of the fuel stored in the fuel tank;
The control unit determines that refueling has started when the amount of the fuel detected by the fuel amount detection unit increases. The claim 1, claim 2, claim 4, and claim 4, wherein The evaporated fuel processing apparatus according to claim 5. A fuel amount detection means for detecting the amount of the fuel stored in the fuel tank;
The control means becomes constant when the amount of the fuel detected by the fuel amount detection means reaches a predetermined amount, or after the amount of the fuel detected by the fuel amount detection means starts to increase. The evaporated fuel processing apparatus according to claim 1, wherein the fuel supply is determined to have been completed.

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