JP2006299994A - Control device for evaporating fuel treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To start fueling work earlier by shortening a time before pressure in a fuel tank is almost the same as atmospheric pressure and shortening a stand-by time after a worker requests the opening of an fuel port and before the opening of the fuel port is permitted. <P>SOLUTION: In this control device for an evaporating fuel treatment device, an ECU executes a program which includes a step (S102) of opening a closing valve when determining that a lid switch is operated (YES in S100), a step (S104) of operating a negative pressure pump module, a step (S108) of stopping the negative pressure pump module when pressure in an atmospheric hole of a canister is predetermined pressure or higher (YES in S106), and a step (S112) of unlocking a lid when inner pressure Pt in the fuel tank is pressure Pth or lower (YES in S110). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for an evaporative fuel processing apparatus, and more particularly to a technique for reducing the pressure in a fuel tank before opening of a fuel filler port.

  A vehicle equipped with a fuel tank of volatile liquid fuel generally includes an evaporative fuel processing device that once adsorbs the evaporated fuel generated in the fuel tank to the canister and purges the adsorbed evaporated fuel into the intake passage of the engine. It has been. In such an evaporative fuel processing device, at the time of refueling, when an operation for opening the refueling port is detected, the gas in the tank containing the evaporated fuel is circulated toward the canister before the refueling port is opened. Technology is disclosed.

  For example, Japanese Unexamined Patent Application Publication No. 2004-156696 (Patent Document 1) discloses an evaporative fuel processing apparatus for an internal combustion engine that effectively prevents the evaporative fuel from being released into the atmosphere without causing a long waiting time during refueling. . This evaporative fuel processing apparatus has a canister that communicates with a fuel tank, an on-off valve disposed in a passage that communicates between the fuel tank and the canister, a refueling request detection means that detects a refueling request, and a refueling request. The opening permitting means for permitting the opening of the fuel filler opening at a predetermined timing after opening the on-off valve.

According to the evaporative fuel processing device disclosed in Patent Document 1, when refueling, the fuel tank and the canister can be made conductive by opening the on-off valve before allowing the refueling port to open. For this reason, it is prohibited to open the fuel filler port until the fuel vapor in the fuel tank flows into the canister and the tank internal pressure decreases, effectively preventing the vaporized fuel from being released into the atmosphere accompanying the opening of the fuel filler port. be able to.
JP 2004-156696 A

  However, in the evaporative fuel processing apparatus disclosed in Patent Document 1, after the operator opens the on-off valve in response to a request for opening the fuel filler, the evaporative fuel in the fuel tank is separated from the fuel tank and the canister. It is necessary to wait until the internal pressure of the fuel tank reaches a value close to atmospheric pressure by flowing out into the canister due to the pressure difference. Therefore, in order to start the refueling work earlier, it is necessary to further reduce the above-described waiting time.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a control device for an evaporative fuel processing apparatus that can start refueling work at an early stage.

  In the control apparatus for the evaporated fuel processing apparatus according to the first invention, the evaporated fuel processing apparatus is provided with a fuel tank, a canister for adsorbing evaporated fuel in the fuel tank, and an opening / closing provided in a passage communicating the fuel tank and the canister. A valve and a pump for reducing the pressure in the canister. The control device includes a detection unit for detecting a request for opening the fuel filler opening of the fuel tank, a pump control unit for controlling the pump so that the pressure in the canister decreases when the request is detected, On-off valve control means for controlling the on-off valve to open the on-off valve when the request is detected.

  According to the first invention, the detection means detects a request for opening the fuel filler opening of the fuel tank (for example, an operation of opening the fuel filler opening by an operator). When a request for opening of the fuel filler opening is detected, the on-off valve is opened, and the pump control means controls the pump so that the pressure in the canister decreases. For example, if the pressure in the canister is set to a negative pressure lower than atmospheric pressure by the operation of the pump, the pressure difference between the fuel tank and the canister can be further expanded. When the on-off valve is opened and the passage is in communication, the evaporated fuel in the fuel tank flows out into the canister based on the expanded pressure difference and is adsorbed by an adsorbent such as activated carbon in the canister. The At this time, since the pressure difference is larger than when the inside of the canister is set to the same pressure as the atmospheric pressure without operating the pump, the flow rate at which the evaporated fuel flows out into the canister increases. Therefore, the time until the pressure in the fuel tank becomes substantially the same as the atmospheric pressure is short, and the waiting time until the opening of the fuel filler opening is permitted after the operator requests the opening of the fuel filler opening is shortened. . Therefore, it is possible to provide a control device for the evaporated fuel processing device that can start the refueling operation earlier.

  In the control apparatus for the evaporated fuel processing apparatus according to the second invention, in addition to the configuration of the first invention, the on-off valve control means controls the on-off valve so that the on-off valve opens in conjunction with the operation of the pump. Means for doing so.

  According to the second invention, the on-off valve control means controls the on-off valve so that the on-off valve opens in conjunction with the operation of the pump. For example, since the pressure in the canister becomes a negative pressure lower than the atmospheric pressure due to the operation of the pump, the pressure difference between the fuel tank and the canister can be further expanded. When the on-off valve is opened and the passage is in communication, the evaporated fuel in the fuel tank flows out into the canister based on the enlarged pressure difference and is adsorbed by an adsorbent such as activated carbon in the canister. Is done. At this time, since the pressure difference is larger than the case where the inside of the canister is set to the same pressure as the atmospheric pressure without operating the pump, the flow rate of the evaporated fuel increases, and the pressure in the fuel tank becomes substantially the same as the atmospheric pressure. The time until is short. Therefore, the waiting time from when the operator requests opening of the fuel filler opening until the opening of the fuel filler opening is permitted is shortened.

  In addition to the configuration of the first or second aspect of the invention, the control device for the evaporated fuel processing apparatus according to the third aspect of the invention includes a tank pressure detecting means for detecting the pressure in the fuel tank, and the detected pressure is predetermined. And a permitting means for permitting the opening of the fuel filler port communicating with the fuel tank when the pressure becomes lower than the predetermined pressure.

  According to the third invention, the tank pressure detecting means detects the pressure in the fuel tank. The permitting means permits the opening of the fuel filler port communicating with the fuel tank when the detected pressure is equal to or lower than a predetermined pressure. As a result, when the opening of the fuel filler is not permitted until the pressure in the fuel tank becomes substantially the same as the atmospheric pressure, for example, when the opening of the filler is permitted, the pressure in the fuel tank is Since the pressure is substantially the same as the atmospheric pressure, it is possible to prevent the evaporated fuel from being released into the atmosphere from the fuel filler opening when the fuel filler opening is opened.

  In the control device for the evaporated fuel processing apparatus according to the fourth invention, in addition to the configuration of the third invention, the predetermined pressure is substantially the same as the atmospheric pressure.

  According to the fourth aspect of the invention, when the opening of the fuel filler opening is permitted until the pressure in the fuel tank becomes substantially equal to or lower than the atmospheric pressure, when the opening of the fuel filler opening is permitted, the pressure in the fuel tank is Since the pressure is substantially the same as the atmospheric pressure, it is possible to prevent the evaporated fuel from being released into the atmosphere from the fuel filler opening when the fuel filler opening is opened.

  In the control apparatus for the evaporated fuel processing apparatus according to the fifth invention, in addition to the configuration of any one of the first to fourth inventions, the pump is a diagnostic pump used when diagnosing fuel leakage of the evaporated fuel processing apparatus. It is.

  According to 5th invention, a pump is a diagnostic pump used when diagnosing the fuel leak of an evaporative fuel processing apparatus. The diagnostic pump is used to preliminarily apply a negative pressure to the canister when diagnosing the occurrence of fuel leakage in the evaporated fuel processing device based on the pressure change in the evaporated fuel passage including the canister and the fuel tank. By operating the diagnostic pump used when diagnosing fuel leakage in such an evaporative fuel processing apparatus during refueling, there is no need to separately provide a pump for reducing the pressure in the canister, thereby suppressing an increase in cost. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the evaporated fuel processing apparatus according to this embodiment includes a fuel tank 10. The fuel tank 10 is provided with a tank internal pressure sensor 12 for detecting the tank internal pressure Pt. The tank internal pressure sensor 12 transmits a detection signal corresponding to the detected tank internal pressure Pt to the ECU 60 described later.

  A vapor passage 20 is connected to the fuel tank 10 via ROV (Roll Over Valve) 16 and 18. The vapor passage 20 includes a blocking valve unit 24 in the middle thereof, and communicates with the canister 26 at the end thereof. The block valve unit 24 includes a block valve 28 and a relief valve 30. The block valve 28 is a normally closed electromagnetic on-off valve that closes in a non-energized state and opens when a drive signal is supplied from the outside. The relief valve 30 includes a forward relief valve that opens when the pressure on the fuel tank 10 side is sufficiently higher than the pressure on the canister 26 side, and a reverse relief valve that opens in the opposite case. This is a mechanical two-way check valve. The valve opening pressure of the relief valve 30 is set based on the strength with respect to the internal pressure of the fuel tank 10.

  The canister 26 includes a purge hole 32. A purge passage 34 communicates with the purge hole 32. The purge passage 34 includes a purge VSV (Vacuum Switching Valve) 36 in the middle of the purge passage 34 and communicates with an intake passage 38 of the engine at the end thereof. In the intake passage 38 of the engine, an air filter 40, an air flow meter 42, a throttle valve 44 and the like are provided. The purge passage 34 communicates with the intake passage 38 downstream of the throttle valve 44.

  The canister 26 is filled with an adsorbent such as activated carbon. The evaporated fuel that has flowed in through the vapor passage 20 can be adsorbed by the activated carbon. The canister 26 includes an air hole 50. The atmospheric hole 50 communicates with one end of an atmospheric passage 54 through a negative pressure pump module 52. The other end of the atmospheric passage 54 is provided so as to communicate with the upper portion of the fuel filler port 58. An air filter 56 is further provided in the atmospheric passage 54. The air filter 56 collects dust, dirt, and the like contained in the atmosphere passing through the atmosphere passage 54 from the fuel filler side.

  The negative pressure pump module 52 includes a negative pressure pump and a switching valve (both not shown). The switching valve can selectively realize an atmospheric open state in which the atmospheric hole 50 of the canister 26 is connected to the atmospheric passage 54 and a negative pressure introduction state in which the atmospheric hole 50 is communicated with the suction hole of the negative pressure pump. It is a valve mechanism. According to the negative pressure pump module 52, the interior of the canister 26 can be opened to the atmosphere by opening the switching valve to the atmosphere, and the negative pressure pump is operated by setting the switching valve to the negative pressure introduction state. A negative pressure can be introduced into the canister 26.

  The negative pressure pump module 52 further incorporates a pressure sensor, and the pressure sensor detects the pressure in the atmospheric hole 50 of the canister 26. The pressure sensor transmits a detection signal corresponding to the detected pressure to the ECU 60. Although the pressure sensor is built in the negative pressure pump module 52 in the present embodiment, the position of the pressure sensor is not particularly limited as long as it is a passage of evaporated fuel from the sealing valve 28 to the canister 26. .

  As shown in FIG. 1, in the present embodiment, the evaporated fuel processing apparatus includes an ECU 60. The control device for the evaporated fuel processing apparatus according to the present embodiment is realized by the ECU 60. A lid switch 62 and a lid opener opening / closing switch 64 are connected to the ECU 60 together with the tank internal pressure sensor 12, the sealing valve 28, or the negative pressure pump module 52 described above. The lid opener opening / closing switch 64 is connected to a lid manual opening / closing device 66 by a wire.

  The lid opener opening / closing switch 64 is a locking mechanism for a lid (vehicle body lid) 68 that covers the fuel filler opening 58, and when a lid opening signal is supplied from the ECU 60 or when the lid manual opening / closing device 66 is opened. When the operation is performed, the lid 68 is unlocked. The lid switch 62 connected to the ECU 60 is a switch for sending a command for releasing the lock of the lid 68 to the ECU 60.

  In the present embodiment, in the fuel vapor processing apparatus, the block valve 28 is in a closed state in principle while the vehicle is traveling. Therefore, the fuel tank 10 is maintained in a sealed state. Thus, the evaporated fuel generated by the evaporation of the fuel in the fuel tank 10 is sealed in the fuel tank 10 and does not leak to the outside. For this reason, the diffusion of the evaporated fuel to the atmosphere is prevented.

  However, as a result of sealing the fuel tank 10, for example, when high temperature return fuel flows from the fuel injection valve into the fuel tank 10 during engine operation and the fuel temperature in the tank rises, the fuel vapor pressure is accordingly increased. Since the pressure increases, the tank internal pressure increases.

  Therefore, the ECU 60 controls the closing valve 28 to open when the tank internal pressure Pt detected by the tank internal pressure sensor 12 exceeds a predetermined allowable value. When the blocking valve 28 is opened, the evaporated fuel in the tank of the fuel tank 10 flows out to the canister 26 based on the pressure difference between the fuel tank 10 and the canister 26, so that the internal pressure of the fuel tank 10 decreases. The evaporated fuel that has flowed out into the canister 26 is adsorbed by an adsorbent such as activated carbon inside the canister 26, and only the air after the evaporated fuel is removed is released to the atmosphere through the atmospheric passage 54.

  Since the engine is in operation, negative pressure is generated in the intake passage 38. Therefore, when the purge VSV 36 is opened, the negative pressure of the intake passage 38 acts on the canister 26 via the purge passage 34, and the internal pressure of the canister 26 becomes lower than the atmospheric pressure. For this reason, when the purge VSV 36 is opened, the atmosphere flows from the atmosphere passage 54. The evaporated fuel adsorbed by the adsorbent is released by the air flowing in from the atmospheric passage 54 and becomes a mixed gas (purge gas) of the evaporated fuel and air and flows from the purge passage 34 into the intake passage 38. The mixed gas flowing into the intake passage 38 burns in the combustion chamber of the engine. This prevents the adsorbent from being saturated with the evaporated fuel.

  Here, assuming that fuel is supplied to the fuel tank 10 while the vehicle is stopped, if the internal pressure Pt in the tank of the fuel tank 10 is higher than the atmospheric pressure when the fuel filler opening is opened, In some cases, the evaporated fuel present in the tank 10 is discharged from the fuel filler port 58 to the atmosphere.

  Therefore, the present invention relates to the negative pressure pump module 52 so that the pressure in the canister 26 decreases when the ECU 60, which is a control device for the fuel vapor processing apparatus, detects the opening of the fuel filler port 58. Is controlled to control the closing valve 28 so that the closing valve 28 is opened. In the present embodiment, the ECU 60 detects an opening request of the fuel filler port 58 by receiving an operation signal from the lid switch 62 that unlocks the lid 68.

  That is, when it is detected that the lid switch 62 is operated by the driver, the ECU 60 operates the negative pressure pump so that the pressure in the canister 26 decreases. When it is detected that the lid switch 62 is operated by the driver, the ECU 60 controls the closing valve 28 so that the closing valve 28 is opened.

  After the closing valve 28 is opened, the gas in the tank containing the evaporated fuel flows out from the fuel tank 10 toward the canister 26. If the switching valve of the negative pressure pump module 52 is opened to the atmosphere after the closing valve 28 is opened, the inside of the canister 26 is opened to the atmosphere, so that the tank internal pressure Pt becomes substantially the same as the atmospheric pressure. Decrease until At this time, since the evaporated fuel flowing into the canister 26 is adsorbed by an adsorbent such as activated carbon, only the air after the evaporated fuel is adsorbed is released to the atmosphere through the atmospheric passage 54. In the following description, the process of reducing the tank internal pressure Pt in this way is simply referred to as “pressure release”.

  Hereinafter, with reference to FIG. 2, a control structure of a program executed by ECU 60 that is a control device of the evaporated fuel processing device according to the present embodiment will be described.

  In step (hereinafter, step is referred to as S) 100, ECU 60 determines whether or not lid switch 62 has been operated. For example, when the lid switch 62 is operated, an operation signal is transmitted to the ECU 60. The ECU 60 determines whether or not the lid switch 62 has been operated by receiving the operation signal. If it is determined that lid switch 62 has been operated (YES in S100), the process proceeds to S102. Otherwise (NO in S100), this process ends.

  In S102, ECU 60 controls blockade valve 28 so that blockade valve 28 is opened. In S104, ECU 60 operates the negative pressure pump of negative pressure pump module 52. The ECU 60 operates the negative pressure pump after switching the switching valve of the negative pressure pump module 52 so that the negative pressure is introduced. At this time, the ECU 60 may operate the negative pressure pump continuously or intermittently.

  In S106, ECU 60 determines whether the pressure in atmospheric hole 50 is equal to or lower than a predetermined pressure. That is, the ECU 60 determines whether or not the pressure in the air hole 50 received from the pressure sensor built in the negative pressure pump module 52 is equal to or lower than a predetermined pressure. If the pressure in atmospheric hole 50 is equal to or lower than the predetermined pressure (YES in S106), the process proceeds to S108. If not (NO in S106), the process returns to S106.

  In S108, ECU 60 stops the operation of the negative pressure pump. At this time, the ECU 60 stops the operation of the negative pressure pump and performs control so that the switching valve is opened to the atmosphere.

  In S110, ECU 60 determines whether tank internal pressure Pt is equal to or lower than pressure Pth. That is, the ECU 60 determines whether or not the tank internal pressure Pt received from the tank internal pressure sensor 12 is equal to or lower than the pressure Pth. The pressure Pth is a pressure at which the tank internal pressure Pt can be reduced by the above-described depressurization, and if the tank internal pressure Pt is reduced to the pressure Pth, a large amount of evaporated fuel can be obtained even if the fuel supply port 58 is opened. Is a pressure that is not released from the fuel filler port 58 to the atmosphere, and is not particularly limited. The pressure Pth is, for example, substantially the same pressure as atmospheric pressure. If it is determined that tank internal pressure Pt is equal to or lower than pressure Pth (YES in S110), the process proceeds to S112. If not (NO in S110), the process returns to S110.

  In S112, ECU 60 unlocks lid 68. That is, the ECU 60 transmits an open signal to the lid opener opening / closing switch 64.

  An operation of ECU 60 that is a control device of the evaporated fuel processing apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  If the driver or the operator operates the lid switch 62 in order to start the refueling operation in the state where the engine is stopped (YES in S100), the closing valve 28 is opened (S102). When the blocking valve 28 is opened, the negative pressure pump is operated in conjunction with the opening (S104). When the internal pressure of the fuel tank 10 is at least higher than the atmospheric pressure, the evaporated fuel flows from the fuel tank 10 through the vapor passage 20 and flows out to the canister 26. The evaporated fuel flowing out to the canister 26 is adsorbed by the adsorbent. When the pressure in the atmospheric hole 50 of the canister 26 is equal to or lower than a predetermined pressure (YES in S106), the negative pressure pump is stopped (S108), and the switching valve of the negative pressure pump module 52 is opened to the atmosphere. Therefore, the air after the evaporated fuel is adsorbed is released to the atmosphere through the atmosphere passage 54. As the evaporated fuel flows out into the canister 26, the internal pressure of the fuel tank 10 gradually decreases until it reaches substantially the same pressure as the atmospheric pressure. At this time, when the internal pressure of fuel tank 10 becomes equal to or lower than pressure Pth (YES in S110), lid 68 is unlocked (S112), the driver or operator opens lid 68, and the opening of the fuel filler opening opens. It becomes possible. That is, when the lid 68 is unlocked, the opening of the fuel filler opening is permitted.

  At this time, the pressure in the fuel tank 10 when the negative pressure pump is operated and when the negative pressure pump is not operated varies as shown in FIG. In FIG. 3, the vertical axis indicates the pressure in the fuel tank 10, and the horizontal axis indicates time. Further, in FIG. 3, in order to compare both cases, it is assumed that the internal pressure of the fuel tank 10 when the blocking valve 28 is opened is the same in both cases.

  The internal pressure Pt of the fuel tank 10 when operating the negative pressure pump shows a change in a thick line in FIG. On the other hand, the internal pressure Pt of the fuel tank 10 in the case where the negative pressure pump is not operated shows a change of the thin line in FIG.

  When the negative pressure pump is operated, the internal pressure of the fuel tank 10 is negative in the canister 26. Therefore, the pressure difference between the internal pressure of the fuel tank 10 and the pressure in the canister 26 is compared with the case where the negative pressure pump is not operated. Become bigger.

  For example, if the negative pressure pump is operated so that the pressure in the canister 26 is 3 KPa lower than the atmospheric pressure, the time when the internal pressure Pt becomes 20 KPa at the time T (1) when the negative pressure pump is not operated. The decrease rate of the internal pressure is substantially the same as the decrease rate of the internal pressure when the internal pressure Pt becomes 17 KPa at time T (2) when the negative pressure pump is operated. This is because the pressure difference at time T (1) (20 KPa (internal pressure of fuel tank 10)) and the pressure difference at time T (2) (17 KPa (internal pressure of fuel tank 10) +3 KPa (negative pressure in canister)) ) Is the same.

  As described above, when the pressure difference between the fuel tank 10 and the canister 26 increases when the blocking valve 28 is opened, the flow rate of the evaporated fuel increases, so the rate at which the internal pressure of the fuel tank 10 decreases, that is, the rate of decrease. Becomes larger.

  When the decreasing rate of the internal pressure Pt of the fuel tank 10 increases, the time T (3) until the internal pressure Pt of the fuel tank 10 becomes equal to or lower than the pressure Pth is the internal pressure Pt of the fuel tank 10 when the negative pressure pump does not operate. It becomes shorter than time T (4) until it becomes Pth or less.

  As described above, according to the control apparatus for the evaporated fuel processing apparatus according to the present embodiment, the fuel tank and the canister can be obtained by setting the pressure in the canister to a negative pressure lower than the atmospheric pressure by operating the negative pressure pump. The pressure difference from the inside can be further increased. When the blocking valve is opened and the passage is in communication, the evaporated fuel in the fuel tank flows out into the canister based on the enlarged pressure difference and is adsorbed by an adsorbent such as activated carbon in the canister. The At this time, since the pressure difference is larger than when the inside of the canister is set to the same pressure as the atmospheric pressure without operating the negative pressure pump, the flow rate when the evaporated fuel flows out to the canister increases. Therefore, the time until the pressure in the fuel tank becomes substantially the same as the atmospheric pressure is short, and the waiting time until the opening of the fuel filler opening is permitted after the operator requests the opening of the fuel filler opening is shortened. . Therefore, it is possible to provide a control device for the evaporated fuel processing device that can start the refueling operation earlier.

  In addition, when the detected pressure is equal to or lower than a predetermined pressure, the ECU permits opening of the fuel filler port that communicates with the fuel tank. That is, the lid is unlocked. By preventing the lid from being unlocked until the pressure in the fuel tank reaches approximately the same pressure as the atmospheric pressure, the pressure in the fuel tank is approximately the same as the atmospheric pressure when the lid is unlocked. Due to the pressure, it is possible to prevent the evaporated fuel from being released into the atmosphere from the fuel filler port when the operator removes the cap of the fuel filler port.

  In the above description, the ECU operates the negative pressure pump until the pressure in the air hole of the canister detected by the pressure sensor built in the negative pressure pump module is equal to or higher than a predetermined pressure. However, the present invention is not particularly limited to this. For example, the ECU may operate the negative pressure pump until a predetermined time elapses. The predetermined time is set based on a time during which the pressure in the canister is predicted to be a negative pressure lower than the atmospheric pressure due to the operation of the negative pressure pump.

  In addition, the negative pressure pump may be provided separately as one that is operated at the time of refueling. However, preferably, the negative pressure pump uses a diagnostic pump that is used when diagnosing fuel leakage of the evaporated fuel processing device. Is desirable. The diagnostic pump is used to preliminarily apply a negative pressure to the passage when diagnosing the occurrence of fuel leakage in the evaporated fuel processing apparatus based on the pressure change in the evaporated fuel passage including the canister and the fuel tank. By operating the diagnostic pump used when diagnosing fuel leakage in such an evaporative fuel processing apparatus during refueling, there is no need to separately provide a pump for reducing the pressure in the canister, thereby suppressing an increase in cost. Can do.

  Further, in the present embodiment, the negative pressure pump is stopped when the pressure in the atmospheric hole is equal to or lower than a predetermined pressure, but the evaporated fuel is not adsorbed by the adsorbent and is not released into the atmosphere as it is. You may make it operate | move continuously or intermittently in the range. If it does in this way, depressurization can be completed earlier.

  Further, in the present embodiment, the opening of the blocking valve is interlocked with the operation of the negative pressure pump, but is not particularly limited, and operates at different times according to the requirement of opening of the fuel filler opening. You may do it.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the evaporative fuel processing apparatus in this Embodiment. It is a flowchart which shows the control structure of the program performed by ECU which is a control apparatus of the evaporative fuel processing apparatus which concerns on this Embodiment. It is a timing chart which shows the change of the internal pressure of a fuel tank.

Explanation of symbols

  10 fuel tank, 12 tank internal pressure sensor, 16, 18 ROV, 20 vapor passage, 24 block valve unit, 26 canister, 28 block valve, 30 relief valve, 32 purge hole, 34 purge passage, 36 purge VSV, 38 intake passage, 40 Air cleaner, 42 Air flow meter, 44 Throttle valve, 50 Air hole, 52 Negative pressure pump module, 54 Air passage, 56 Air filter, 58 Refueling port, 60 ECU, 62 Lid switch, 64 Lid opener open / close switch, 66 Lid manual open / close Equipment, 68 lid.

Claims (5)

A control device for an evaporative fuel processing device, wherein the evaporative fuel processing device is provided with a fuel tank, a canister for adsorbing the evaporative fuel in the fuel tank, and an on-off valve provided in a passage communicating the fuel tank and the canister And a pump for reducing the pressure in the canister,
Detection means for detecting a request for opening of a fuel filler opening of the fuel tank;
A pump control means for controlling the pump so that the pressure in the canister decreases when the request is detected;
An on-off valve control means for controlling the on-off valve so as to open the on-off valve when the request is detected.   2. The control apparatus for an evaporated fuel processing apparatus according to claim 1, wherein the on-off valve control means includes means for controlling the on-off valve so that the on-off valve opens in conjunction with the operation of the pump. The control device includes:
Tank pressure detection means for detecting the pressure in the fuel tank;
The evaporative fuel processing device according to claim 1, further comprising permission means for permitting an opening of a fuel filler port communicating with the fuel tank when the detected pressure is equal to or lower than a predetermined pressure. Control device.   The control device for the evaporated fuel processing apparatus according to claim 3, wherein the predetermined pressure is substantially the same pressure as the atmospheric pressure.   The said pump is a control apparatus of the evaporative fuel processing apparatus in any one of Claims 1-4 which is a diagnostic pump used when diagnosing the fuel leak of the said evaporative fuel processing apparatus.

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